JP3530276B2 - 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 an oil fan heater,
The present invention relates to a hot air heater such as a sfan heater. [0002] 2. Description of the Related Art Vaporization conventionally used for this kind of warm air heater
As a liquid fuel combustion system of the type, for example, JP-B-63-45
No. 003, from the burner head flame hole to the side
Metal flame while minimizing the spread of flame
Make sure that the firing cylinder is not heated to
A technology provided with a metal plate is disclosed.
JP-A-07-2007, the position between the ground plate and the burner head is described.
Technology that provided multiple heat recovery walls on the top of the vaporizing cylinder was disclosed.
Have been. On the other hand, Japanese Patent Application Laid-Open No.
Is located on the warm air outlet side provided in front of the heater
Install a downward wind direction change plate on the lower surface of the top of the wind
Even if the air supply port is blocked by dust, dust, etc.
Liquid fuel combustion for stable supply of secondary air
An apparatus is disclosed. [0004] The above two publications
The spread of the flame going to the side by the ground plate
And directly around the vaporizing section.
The secondary air is guided upward from the outside of the flame to keep the combustion air safe.
Control the spread of flame to the side by air flow while supplying constant
However, the flame retarding effect of this earth plate is too large
Instead, the flame is reduced and the desired combustion flame (fire
Force). Also, during strong combustion
The amount of the flame that hits the ground plate
And the area that the flame touches increases
Then, the temperature of the ground plate becomes too high and glows red,
The burden on the board itself is too great and expensive materials must be selected.
Or the earth plate itself was easily degraded
If you do not change the shape of only the part facing the flame hole
There was a problem such as not becoming. [0005] In particular, the secondary air supply and suction ports are
If it is blocked by dust or dirt, a secondary space
Gas cannot be supplied, and the fuel cannot be completely burned.
Prevents the generation of large amounts of fire and the spread of the flame to the side
It is no longer possible to suppress red heating of the combustion cylinder
There was a defect. In addition, when the combustion is weak,
The flame coming out does not reach the ground plate, and the ground plate
It is a barrier to supply and cannot supply secondary air to the vicinity of the flame.
There was a problem that it was easy to complete combustion. On the other hand, in the latter publication,
The generated combustion gas is guided upward and directly or indirectly
(Radiation) to come into contact with the wind tunnel,
The temperature of the part located just above the combustion cylinder) is too high,
Thermal damage to parts above the wind tunnel or connection to the wind tunnel
There is a fear that heat conduction to the main unit may endanger the user.
Yes, and because the combustion gas easily hits the wind tunnel
Soot is easily attached to the lower surface of the wind tunnel, and soot is attached to the lower surface of the wind tunnel.
Is guided by the cool air from the blower to the outlet of the heater
Soot is blown out of the outlet with hot air
There was also. Furthermore, the combustion cylinder is
Just guiding the next air will prevent the flame from spreading to the side.
Do not stop the fire and consequently make the flame touch the combustion cylinder
Because it is not possible to suppress the red heating of the combustion cylinder
I can't. [0007] Especially in both technologies, the burner body is
At the outlet of the heater to be heated, the burner body
Secondary air flowing upward from the outside of the
Can not be passed only where the introduction part is located
The spread of the flame at least above this part
The air cannot be pushed back inward, and the upper part of the heater outlet
Only a part of the combustion cylinder located outside is likely to be red-hot
There were also problems. Therefore, in the present invention, combustion is performed by a simple configuration.
Prevents local red heating of the cylinder and prevents secondary air
The purpose is to provide a hot air heater that can be supplied stably.
You. [0009] The warm air according to claim 1 of the present invention.
The heater has an outside air inlet and a hot air outlet, and the
Supply the outside air sucked from the outside air inlet to the hot air outlet
Body case with a convection blower
Provided in the case from the outside air inlet to the hot air outlet
The wind tunnel that guides the outside air and the upper opening
A combustion cylinder, and a burner device provided at a lower portion inside the combustion cylinder;
A heat shield provided between the combustion cylinder and the top of the wind tunnel.
Equipped with a hot air heater, the outside of the heat shield
A front sloping part is provided to guide the sloping part downward sequentially.
Air flowing between the wind tunnel and the heat shield plate into the combustion cylinder
Set an opening for introductionThe outside of the heat shield plate is
A rear inclined part that guides up next, and further from this rear inclined part
There is a hanging piece which hangs down,
An opening for introducing outside air to the lower surface of the heat shield plate is provided.That
You. [0010] [0011] [0012] According to the invention of claim 1, the opening provided on the heat shield plate is provided.
The mouth forwards the combustion gas (in the direction where the hot air outlet is located)
Not only as a guide port for guiding, but also at the front of the combustion cylinder
Since it acts as an introduction part for introducing air, the combustion cylinder is
Cooling air from the outside and cooling to cool the combustion cylinder from the outside
The wind can be guided, suppressing red heat in the combustion cylinder and burning
Secondary air is supplied stably from above.Also, heat shield plate
Front slope that is provided at the front of
The opening formed in the part is the space that flows between the wind tunnel and the heat shield.
Acts as an air inlet that introduces part of the air into the combustion cylinder
Therefore, some of the air flowing between the wind tunnel and the heat shield plate
To cool the combustion cylinder from the inside and to the side of the flame
Spread is also suppressed, and the red heat at the front of the combustion cylinder becomes more effective
Be suppressed. In addition, outside air is installed at the rear of the heat shield
An opening formed in the rear inclined part that guides upwards shields outside air
Acts as an inlet for the lower surface of the plate, so it can be
Cooling of the surface is promoted, and the upper part of the combustion gas is suppressed diagonally forward and downward.
Easier. [0013] [0014] [0015] Embodiments of the present invention will be described below in detail with reference to the drawings.
You. FIG. 1 shows an overall configuration of a warm air heater according to the present invention.
FIG. 2 is a side sectional view showing an embodiment, and FIG.
FIG. 3 is a cross-sectional view, and FIG. 3 is an obliquely lower view showing one embodiment of the heat shield plate of the present invention.
FIG. 4 is a perspective view seen from the rear, and FIG.
FIG. 5 is a perspective view showing an example viewed obliquely from the lower rear, and FIG.
FIG. 6 is a perspective view showing an embodiment of a vaporizer device, and FIG.
It is a perspective view showing one example of a cylinder. 1 and 2, reference numeral 1 denotes a petroleum fan
Hot air heaters (hereinafter referred to as heaters)
Yes, heater 1 has upper surface 2A, front surface 2B, rear surface 2C and left
A metal body case 2 having right side surfaces 2D and 2E;
Thick metal base for closing the lower opening of main body case 2
And 3. Hot air is blown at the approximate center of the front of the main body case 2.
An outlet 4 is formed, and an air inlet and
And round air that also serves as the bell mouth of fan 7C described later
An inflow port 5 is formed.
A plurality of outside air suction ports 6 formed in a mesh shape and
A metal filter / funger having a blower 7
8 is attached. The convection blower 7 has a rotating shaft 7A.
And a motor attached to the rotating shaft 7A.
7C. One end of the main body case 2 is heated.
The other end communicates with the air outlet 4 and the other end is located above the air inlet 5 (details).
Or the fan 7C of the convection blower 7)
Guides outside air sucked from the air inlet 6 to the hot air outlet 4
A wind tunnel 9 made of metal is disposed. In the figure
Arrows indicate the flow of air. Reference numeral 11 denotes a stone arranged at a lower portion in the main body case 2.
This burner device vaporizes oil fuel and burns it.
Device 11 is a cylinder made of aluminum alloy having a bottom and a cylindrical shape.
11A and a side mounted on the upper part of the vaporizing cylinder 11A.
Burner head 11B having a plurality of flame holes 11b
And a burner case 11C surrounding the periphery of the conversion cylinder 11A.
(See FIG. 5 for details). Reference numeral 12 denotes a primary combustion space in the vaporizing cylinder 11A.
Air (hereinafter referred to as primary air) and the burner
Secondary air for combustion (hereinafter referred to as secondary air) is contained in the case 11C.
) For supplying combustion, and the combustion blower 12
Is a motor 12B having a rotating shaft 12A, and a motor 12B
The fan 12C attached to the rotating shaft 12A of FIG.
Equipped with a light emitting unit and a light receiving unit for detecting the rotation speed of 2A
And a photo sensor 12D. The suction duct 13 of the combustion blower 12 is
It extends beyond the rear face 2C of the main body case 2 and
The filter 1 is installed at the suction port (the end of the suction duct) 13A.
4 are provided. The position of the suction port 13A is the main body case.
Is not limited to the rear surface 2C, but may be on the left and right sides.
No. Numeral 15 supplies primary air to the vaporizing cylinder 11A.
16 is a primary air supply passage for combustion for
Secondary air for combustion to supply secondary air into
Reference numeral 17 denotes a supply passage, which penetrates the primary air supply passage 15 for combustion.
To supply liquid fuel to the vaporization cylinder 11A
This is a nozzle as a fuel supply device. 18 is burnerin
And 19 are opposed to the flame holes 11b of the burner head 11B.
A plurality of heat recovery projections provided on the upper surface of the vaporization cylinder 12A;
Reference numeral 20 denotes a frame sensor, and reference numeral 21 denotes a spark plug. still,
The heat recovery projections 19 must correspond one-to-one with the flame holes 11b.
No 22 is an upper metal opening provided in the wind tunnel 9.
The combustion cylinder 22 is a mouth combustion cylinder, and the combustion cylinder 22
11 around the upper part (especially burner case 11C)
It is provided upright on the bottom of the wind tunnel 9, and the upper opening
22B, the combustion gas generated by the burner device 11 is discharged.
It is made to make. So as to face the combustion cylinder 22
The propeller fan 7C of the convection blower 7 is arranged at
The height of the cylinder 22 is the upper surface of the motor 7B as shown in FIG.
It is almost the same as the height. Reference numeral 23 denotes a flame monitor provided on the front surface of the combustion tube 22.
It is a peep window. This viewing window 23 is provided with a transparent member for viewing.
The transparent mica plate 23A is fixed to the combustion tube by the fixture 23B.
22 and fixed to the front outer surface
ing. As a transparent member for viewing through the viewing window 23, heat resistance
And those having sufficient strength are preferable.
It is possible to use a thin glass plate instead of 3A,
Not suitable because it is easily damaged by flames or heat of combustion gas
It is. In addition, the mica plate 23A is in close contact with the outer surface of the combustion tube 22.
If not fixed, the hot air and combustion inside the combustion cylinder 22
Gas leaks out of the gap, producing carbon monoxide
Therefore, the mica plate 23A is closely adhered and fixed.
It is important to determine In FIG. 1, F indicates a normal state in a strong combustion state.
Shows the general shape of the flame that can be seen when burning, FX is the same
Although not visible, it shows the general shape of the actual flame. Reference numeral 30 denotes a connection between the combustion cylinder 22 and the top surface 9A of the wind tunnel 9.
It is a heat shield plate made of aluminized steel plate provided between them. This
As shown in FIG. 3, the heat shield plate 30 has a top surface 9 </ b> A of the wind tunnel 9.
The top surface 31 facing the front and its front and rear
The front inclined part 32 and the steeply inclined part are bent obliquely downward.
And the rear slope portion 33 is formed, and the front slope portion is formed.
32, the lower end of the combustion tube 22
A front hanging piece 34 extending to a position overlapping with
From the lower end of the cylinder to above the combustion cylinder 22
An extended posterior hanging piece 35 is formed. On the left and right sides of the top surface 31 of the heat shield plate 30,
Each of the side pieces 36, 36 is bent downward at a right angle.
Are formed on the rear side of these side pieces 36, 36.
As the first fixing part which extends to the bottom and is bent downward
Rear fixing pieces 37, 37 are formed. Hanging piece
At both ends of 34, heat shield plates 30Wind tunnel9 fixed to the side wall
As a second fixing portion having a claw and a screw hole for
The fixed piece portions 38, 38 are formed, and the fixed piece portions 37, 38
Are formed on the side wall and the front wall of the wind tunnel 9, respectively.
Holes (not shown) and temporarily fixed and fixed
One part is permanently fixed by spot welding. After the gently inclined rear inclined portion 33,
The trailing piece 35 formed on the edge is as shown by a broken line in FIG.
The relationship between the rotation direction of the propeller fan 7C and the flow of wind
The right portion 39 is cut away. Numeral 40 denotes a combustion cylinder 22 formed on the front inclined portion.
A front hole as an opening for introducing outside air into the front of the
In this embodiment, the center in the width direction is the center position of the combustion cylinder 22.
To form a square with a width of 66mm and a height of 16mm
However, the shape and the center position in the width direction are otherwise limited to this example
It is not an ellipse or a semicircle only at both ends.
You may. In addition, 41 is formed on the rear inclined portion 33 and is a heat shield
To the lower surface of the top surface 31 of the plate 30 and the front of the combustion tube 22
A back hole as an opening for introducing outside air for introducing outside air,
In the present embodiment, a semicircular long hole (width 80 mm, height
15mm), but the shape is limited to this example
Not circular, elliptical, square, triangular
Any shape is acceptable. The solid arrows in FIG. 2 indicate the flow of air during combustion.
The dashed-dotted arrows indicate these openings 40 and 41.
1 shows an outline of the flow of air introduced from a. The outside air provided at the front of the heat shield plate 30
The opening formed in the front inclined portion 32 that guides the
The port 40 is provided with one of the air flowing between the wind tunnel 9 and the heat shield plate 30.
Acts as an air introduction section for introducing the section into the combustion tube 22
Therefore, the air flowing between the wind tunnel 9 and the heat shield plate 33 (outside air)
Can be positively guided to the front of the combustion cylinder 22.
And the combustion cylinder 22 can be cooled from the inner surface.
In addition, it is possible to effectively suppress the spread of the flame F to the side.
Came. In particular, the front part of the conventional combustion cylinder 22 (especially the
(Prone) due to prolonged exposure of the flame to the surrounding area)
It is possible to suppress and prevent the red heat phenomenon of the combustion cylinder 22
Was. Further, provided outside the heat shield plate 30,
An opening 41 formed in the rear inclined portion 33 that sequentially guides upward.
Introduces outside air into the lower surface of the top surface 31 of the heat shield plate 30
Acts as a mouth, promoting cooling of the lower surface of heat shield plate 30
And push the upper part of the combustion gas diagonally forward and downward.
As a result, the thermal effect on the heat shield plate 30 could be suppressed. Moreover, the combustion can be performed by the two openings 40 and 41.
Secondary air can also be supplied from above into the cylinder 22,
This makes it possible to supply secondary air from both directions.
Was. In the above configuration, for example, the combustion cylinder 22
L1 between the end of the upper surface opening 22B and the lower end of the hanging piece 35
Is about 8 mm.
The distance L2 between the extension of the rotating shaft 7A of the blower 7 and the extension line is about 14 m.
m, between the end of the upper surface opening 22B of the combustion tube 22 and the heat shield plate 30
By setting the interval L3 to about 20 mm, the ratio of each interval, that is,
L1: L2: L3 = 1: about 1.75: about 2.5.
The lower end of the front hanging piece 34 of the wind tunnel 9 and the upper surface of the combustion cylinder 22 are opened.
The distance L4 between the end of the opening 22B and the end of the combustion cylinder 22 is about 33 mm.
The diameter of the blower is about 140 mm,
The height h1 to the extension of the rotating shaft 7A is 120 mm, and the wind tunnel
From the bottom of 9Wind tunnelThe height h2 to the top 9A of 9 is 204
mm. FIG. 4 shows another embodiment of the heat shield plate.
However, the same reference numerals as those of the heat shield plate 30 shown in FIG.
Shall have the ability. 50 is another heat shield plate, 51 is
Part of the front part of the top surface 31 was cut and raised in the width direction to form
An opening formed by the cut and raised piece 52. The cutting and raising piece 52 is inclined obliquely backward.
The top 9A of the wind tunnel 9 and the top surface 31 of the heat shield plate 50
Force a part of the air flowing between
And from the opening 51 under the heat shield plate 50
Which guides outside air to the inner surface of the front part of the combustion cylinder 22 in particular.
is there. By forming this opening 51, combustion
The combustion gas generated in the front (specifically, the hot air outlet 4
Not only can be guided in the direction
Since outside air can be introduced into the front part of the firing cylinder 22,
Cooling air for cooling the firing cylinder 22 from the inner surface
Efficiently guides cooling air that cools from the surface from above to below
To suppress the red heat phenomenon of the combustion cylinder 22 (especially the front part).
And the secondary air for combustion can be
Was able to supply it stably. In the above configuration, the burner device 11
The combustion gas generated by burning (see FX in FIG. 1)
Ascends, passes through the upper opening 22B of the combustion tube 22, and heat shield plate 30
For convection provided on the rear surface of the body case 2
The air is mixed with the outside air sent from the blower 7 and becomes hot air.
The air is blown out from the wind outlet 4 to heat the room. By the air sent from the convection blower 7,
A rise in the temperature of the rotating shaft 7A can be suppressed as in the prior art.
The lubricating oil in the bearing part evaporated or hardened due to the temperature rise
AndRotary shaft 7AAdverse effects such as the machine not rotating smoothly
Can be prevented. In addition, the rear inclined portion 33 and the rear hanging piece 35
The air sent from the convection blower 7 is
Between the upper surface opening 22A and the heat shield plate 30;
It can be appropriately distributed between the wind tunnel 9 and the top 9A.
Therefore, combustion can be stabilized and the body
The case 2 can be efficiently prevented from overheating. Incidentally, the suction duct of the combustion blower 12
13, a filter (not shown) provided at the suction port 13A.
Is clogged or blocked by curtains, etc.
Of the primary air for combustion into the vaporizing cylinder 11A.
As the supply amount decreases, the amount of fuel
Insufficient air supply due to reduced supply of secondary air for burning
It becomes. At this time, it is formed in the flame hole 11b of the burner head 11B.
The formed flame F becomes red fire due to lack of oxygen,
Not only does the temperature drop, but also the temperature of the combustion gases
The position of the flame outline is also higher than the outline FX during normal combustion
The heat shield plate 30 is directly heated by the flame.
More easily. In addition, if there is insufficient oxygen, unburned gas is generated.
The emission of carbon monoxide is also increased. In this embodiment, the rear hole of the rear inclined portion 33 is provided.
41 and the notch 39 of the drooping piece 35 and the
A convection blower is provided by a gap between the upper end 22 </ b> B of the firing cylinder 22.
Part of the air blown from 7 is connected to the upper opening 22B of the combustion cylinder 22.
Since it is introduced into the space between the heat shield plate 30 and the upper surface opening 2
External air (fresh air) at a right angle to the flame FX protruding from 2B
) Is supplied, and the flame FX is burned by the fresh air.
Is accelerated and the flame is shortened.
Will not come out. Flame F
The combustion of carbon monoxide in X is promoted to carbon dioxide
Therefore, generation of carbon monoxide can be reduced. In the above embodiment, the heat shield plate 30
Or 50 parts are integrally formed by bending
Therefore, the number of parts can be reduced and the configuration can be simplified. FIG. 5 shows a burner which can be preferably used in the present invention.
FIG. 3 is an explanatory diagram showing a main part of the device 11 in an enlarged manner. Burner
The device 11 includes the vaporizing cylinder 11A and the vaporizing cylinder 1 as described above.
1A and a burner head 11B mounted on the
The burner head 11B is provided on the outer periphery of the burner head 11B.
From the upper end portion toward the root portion
Has a comb-shaped annular wall with many slits S
Burner ring 61 and burner hole 11b of burner head 11B
Ignition of the mixture of oil and fuel and primary air
And an ignition plug 21 and a frame sensor 20.
The insulators of the ignition plug 21 and the frame sensor 20
It is provided outside the comb-like annular wall (that is, the burner ring 61).
In addition, the spark plug 21 and the frame
Of the slit S at the portion of the
Insulator protection part 6 with no slit or shallower slit than other parts
1P and 61Q are formed. Reference numeral 62 designates the vaporizing cylinder 11A at a predetermined temperature (for example, 2
Heating sheet as a vaporization heater for heating to 50 ° C or higher
Heater, which is substantially annular above and inside the vaporizing cylinder 11A.
And are derived from one place. This heater 6
2 is called a deriving unit 62A, and the burner ring 61A
In the portion facing the outlet portion 62A of the heater,
No lit S or shallower slit than other parts
Protection portion 61R. With this configuration, the flame hole is used at the time of weak combustion.
The flame formed on 11b becomes smaller, and the secondary air becomes
From the slit S in the annular wall to the inside of the burner ring 61
As it flows in, it flows into the inside of this burner ring 61
The combustion reaction of the flame is promoted by the secondary air, generating carbon monoxide.
Good weak combustion with little production can be performed. Also during strong combustion
Means that the flame formed in the flame hole 11b becomes large,
The heat of the flame is taken away by the comb-shaped annular wall and the heat recovery projection 19.
As a result, the flame temperature can be lowered and the amount of NOx
Diminished. Further, the burner ring 61 includes an ignition plug.
Of the insulator 21 and the insulator of the frame sensor 20
Since the insulator protection parts 61P and 61Q were formed separately,
The flame protection by the insulator protection parts 61P and 61Q
In addition, while preventing the flame from spreading to the side,
The ignition plug 21 and the plug can be pointed upward.
The temperature of the insulator of the frame sensor 20 rises above the heat-resistant temperature
The ignition plug 21 and the frame
The thermal damage of the sensor 20 can be reliably prevented with a simple configuration.
Was. In the burner ring 61, the heater
Protection without slit S at the part facing the lead-out part 62A
Since the part 61R is formed, the presence of the lead-out part 62A
The flow of secondary air guided upwards is obstructed by the flame
The so-called air curtain effect that pushes inward is partially broken
Even if it is broken, catch the flame with this protection part 61R
At the same time, while preventing the flame from spreading to the side,
The flow can be directed upward, and the combustion cylinder 22
Likely to occur in the portion located in the vicinity of the
It was possible to prevent and prevent the red hot phenomenon. Figure 6 is a book
Vaporization cylinder 11 of burner device 11 that can be preferably used in the present invention
It is an enlarged view of the principal part of A. Liquid fuel and primary for combustion inside
Upper end of a bottomed cylindrical vaporizer 11A to which air is supplied
And a plurality of burner heads 11B facing the flame holes 11b.
A configuration in which (in this embodiment, six) heat recovery projections 19 are provided.
It is. 62 is the above-mentioned sheathed heater for heating. [0048] With this configuration, the flame is generated when the combustion is weak.
Becomes smaller, and the burner head 11B
The flame approaches, but the burner head 11B and the vaporizing cylinder 11A
The upper end of the flame is brought into contact with the flame by the heat recovery projection 19.
Therefore, it is sufficiently heated, and the vaporizing part (the inside of the vaporizing cylinder) is
Temperature suitable for vaporization of body fuel (for example, 330 ° C. to 370 ° C.)
Degree of heating). On the other hand, the flame is large during strong combustion.
The high temperature part of the flame separates from the flame hole 11b
Are provided at the upper end of the vaporization cylinder 11A (in the embodiment,
6) heat recovery projections 19 are wrapped in the high temperature part of the flame.
Heated and heated heat recovery projections 19
Can be transferred to the lower part of the vaporizing cylinder 11A,
Dramatically increase heat recovery during strong combustion
it can. The heat recovery projections 19 are as shown in FIG.
As shown, each has a cylindrical shape, and the diameter is about 6 to 8 mm.
The height is set to about 8 to 10 mm,
Between the upper ends of the vaporizing cylinders 11A in the circumferential direction.
Install with a gap (for example, a large gap of about 25 to 35 mm)
And formed by integral molding with the vaporizing cylinder 11A.
Has been established. As described above, the range from strong combustion to weak combustion
The range of temperature change of the vaporization cylinder 11A can be reduced in a wide range,
From strong to weak combustion depending on the vaporization state of the fuel
And stable frame current
And reduce the amount of carbon monoxide generated,
Nitrogen oxides in the flame temperature drop due to the heat recovery action of part 19
Can greatly reduce the combustion range.
You. [0051] 【The invention's effect】The present inventionAccording to the opening provided in the heat shield plate,
Guiding the combustion gas forward (in the direction where the hot air outlet is located)
Not only acts as a guide port, but also
Acts as an inlet for introducing outside air, so the combustion cylinder
Cooling air that cools from the surface and cooling that cools the combustion cylinder from the outside
The wind can be guided together, suppressing the red heat of the combustion cylinder
As a result, combustion secondary air can be stably supplied from above. [0052]Also,Provided in front of the heat shield plate to release outside air sequentially
The opening formed in the front slope that guides diagonally downwards
Part of the air flowing between the heat shield plate is introduced into the combustion cylinder
Acts as an air inlet, so there is a gap between the wind tunnel and the heat shield
Actively guide part of the flowing air to the front of the combustion cylinder.
That the combustion cylinder can be cooled from the inside.
In addition, the spread of the flame to the side can be suppressed,
Red heat at the front of the firing cylinder can be more effectively suppressed. [0053]Furthermore,Outside air provided behind the heat shield
The opening formed in the rear inclined part that guides the
Acts as an inlet for the bottom of the heat shieldSoThermal barrier
The cooling of the lower surface of the plate can be promoted, and the upper part of the combustion gas is inclined.
It can be pushed forward and downward, suppressing thermal effects on the heat shield plate.
Can be controlled.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view showing one embodiment of the entire configuration of a warm air heater according to the present invention. FIG. 2 is an enlarged side sectional view of the upper part of FIG. FIG. 3 is a perspective view showing one embodiment of the heat shield plate of the present invention as viewed obliquely from below and rearward. FIG. 4 is a perspective view of another embodiment of the heat shield plate of the present invention, as viewed obliquely from below and rearward. FIG. 5 is a perspective view showing an embodiment of the burner device of the present invention. FIG. 6 is a perspective view showing one embodiment of a vaporizing cylinder (burner body) of the present invention. [Description of Signs] 1 Oil fan heater (warm air heater) 2 Main body case 4 Hot air outlet 6 Outside air inlet 7 Convection blower 9 Wind tunnel 11 Burner device 22 Combustion cylinder 22B Top opening 30 Heat shield plate (first embodiment) Example) 31 Top surface 32 Front inclined portion 33 Rear inclined portion 40 Front hole (opening) 41 Rear hole (opening) 50 Heat shield plate (second embodiment) 51 Opening 52 Cut and raised piece

Claims (1)

(57) [Claim 1] A body case having a convection blower having an outside air suction port and a hot air outlet, and having a rear surface to which outside air sucked from the outside air suction port is supplied to the hot air outlet. A wind tunnel provided in the main body case for guiding outside air from the outside air suction port to the hot air outlet, a combustion cylinder having an upper opening provided in the wind tunnel, and a burner provided in a lower portion in the combustion cylinder In a hot air heater provided with a device and a heat shield provided between the combustion cylinder and the top of the wind tunnel, a front inclined portion for guiding outside air sequentially obliquely downward to the front of the heat shield. the provided, only setting the opening for introducing air into the combustion cylinder flowing between the front inclined portion the thermal shield plate and wind tunnel in, the rear portion of the heat shield plate, the outside air
And a rear inclined portion for sequentially guiding the
A hanging piece that hangs downward is provided.
A hot air heater provided with an opening for introducing outside air to a lower surface of the heat shield plate .