JPH0894023A - Combustion device of hot air heater - Google Patents

Abstract

PURPOSE: To provide a combustion device of a hot air heater capable of securing the stability of combustion without overheating a combustion chamber even when the difference in the heat generation rate between the high combustion and the low combustion is large. CONSTITUTION: A combustion device of a hot air heater is provided with a vaporizer 13 to which a pump to feed the oil in a variable manner of the oil amount is connected, a burner 2 which is provided opposite to the vaporizer 13, a burner base 5 to hold the burner 2, an air chamber 7 provided to the lower part of the burner base 5 surrounding the burner 2, a combustion chamber 8 to surround the flame from the burner 2, and a blower 10 to feed the air in a variable manner of the air volume which is provided rearward of the combustion chamber 8, a secondary air opening 11 is provided on the back side of the combustion chamber 8, a secondary air inlet 12 is also provided at the upper part on the side of the combustion chamber 8, and a secondary air port 6 is provided on the forward side and the back side or only on the forward side of the position of the burner 2 of the burner base 5. The opening area of the secondary air port 6 is equivalent to that of the primary air port 3 of the burner 2, or a specific value smaller than the opening area of the primary air port 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion device of a hot air heater such as an oil fan heater equipped with a vaporization burner.

[0002]

2. Description of the Related Art In a conventional combustion apparatus for a hot-air heater, for example, Japanese Patent Laid-Open No. 5-340511 and Japanese Utility Model Laid-Open No. 63-63.
As disclosed in Japanese Patent Publication No. 201951, consideration is given to the partition of burner flame holes and the introduction method of secondary air so that the stability of combustion can be ensured even if the difference in heat generation amount between strong combustion and weak combustion is large. There is something I did.

FIG. 3 is a cross-sectional view showing an example of a conventional combustion apparatus for a hot air heater. In the figure, a mixed gas of vaporized gas and primary air is sent to a burner 21, and after being mixed therein, It burns in the flame hole 22. The combustion chamber 23 and the air chamber 24 are vertically divided by the partition plate 25 at the flame hole 22 position.

As the secondary air 26 for combustion, the air from the blower 28 is introduced from the opening 27 on the back surface of the combustion chamber 23, and the air guide plate 2 is introduced.
9 rises along the line 9 and is guided to the combustion chamber 23 through the discharge opening 30 provided in the upper part of the front surface of the baffle plate 29, and acts on the combustion flame. The combustion exhaust gas is discharged to the outside of the combustion chamber 23 through the opening 31 at the upper portion of the combustion chamber 23 due to the draft effect of the blower 28.
The hot air is mixed with the air blown from the blower 28 and is discharged into the room from the louver 32.

By positioning the discharge opening 30 of the baffle plate 29 below the height of the combustion flame 33 in the combustion chamber 23 during strong combustion, the secondary air 26 introduced into the combustion chamber 23 from the discharge opening 30 is removed. The combustion flame 33 at the time of strong combustion is mixed at right angles, a secondary air wall 34 is formed on the combustion flame 33 at the time of strong combustion, and secondary combustion occurs at this position.
Even if the primary air is insufficient, the secondary air is sufficiently supplied, and the red fire combustion and the generation of carbon monoxide CO are suppressed.

Further, the discharge opening 30 is positioned above the height of the combustion flame 35 in the combustion chamber 23 during weak combustion, so that the secondary air 26 guided to the combustion chamber 23 from the discharge opening 30 during weak combustion. Stable combustion can be obtained without adversely affecting the combustion flame 35.

Therefore, even if the difference between the calorific values of the strong combustion and the weak combustion is large, the stability of the combustion can be ensured.

[0008]

However, in the above-described conventional combustion device for the warm air heater, the secondary air 26 for combustion is blown by the blower 28 from the opening 27 on the back surface of the combustion chamber 23, but from the front. Since the secondary air is not secured, for example, the combustion flame 33 at the time of strong combustion comes into contact with the front side of the combustion chamber 23 to be cooled, and carbon monoxide CO and soot are generated, or the front side of the combustion chamber 23. However, there is a drawback that it causes a problem of abnormal heating.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and includes a carburetor connected to a pump for feeding a variable amount of oil, and a burner opposite to the carburetor. A burner base that holds this burner, and an air chamber that surrounds the burner and is provided at the bottom of the burner base,
In a combustion device of a warm air heater equipped with a combustion chamber that surrounds a flame from a burner and a blower that is provided behind this combustion chamber and that blows air with a variable air volume, a secondary air opening is provided on the rear side of the combustion chamber, Provide a secondary air introduction hole on the front side and the rear side of the burner base, or only on the front side,
The opening area of the secondary air hole is equivalent to the opening area of the primary air hole of the burner or a predetermined area smaller than the opening area of the primary air hole, and a secondary air port is also provided on the upper side surface of the combustion chamber. Is.

Alternatively, in the above, the burner base may not be provided with secondary air holes.

[0011]

With the above structure, the secondary air opening provided on the rear side of the combustion chamber supplies sufficient secondary air even if the primary air is insufficient for the combustion flame during strong combustion. Burn,
It acts to suppress red fire combustion and the generation of carbon monoxide, and the secondary air port provided on the upper side of the combustion chamber supplies appropriate secondary air to the front side of the flame in the combustion chamber, The wrapping with the secondary air prevents the flame from coming into contact with the front side of the combustion chamber and prevents the generation of carbon monoxide and abnormal heating of the front side of the combustion chamber. In addition, the secondary air introduction hole provided in the burner base serves to prevent the generation of carbon monoxide by supplying appropriate secondary air to the flame in the combustion chamber without heating or cooling the combustion flame during weak combustion. .

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a combustion device of a hot air heater according to an embodiment of the present invention, and FIG. 2 is an external perspective view of a main part of the combustion device of the hot air heater.

In the figure, reference numeral 1 is a main body of a warm air heater. Reference numeral 2 denotes a burner provided in the main body 1. The burner 2 has a primary air hole 3 at one end and a flame hole 4 at the upper portion. Reference numeral 5 denotes a burner base provided below the inside of the main body 1, to which the burner 2 is attached, and secondary air holes 6 are provided on the front and rear sides of the burner 2, respectively. (In some cases, the secondary air hole 6 may be provided only on the front side or the secondary air hole 6 may not be provided.) An air chamber 7 containing the burner 2 is provided upstream (downward) of the burner base 5. Further, a combustion chamber 8 is provided downstream (above) the burner base 5, and a flame 9 is formed in the flame hole 4 in the combustion chamber 8. A blower 10 whose rotation speed is variable is provided behind the combustion chamber 8.
A secondary air opening 11 is opened at the rear of the combustion chamber 8. A plurality of secondary air openings 11 are provided at the height of the middle portion of the combustion chamber 8. A secondary air inlet 12 is also provided on the side surface of the combustion chamber 8 from the middle portion to the upper portion thereof.

Reference numeral 13 is a vaporizer having a nozzle 14,
It is opposite the burner 2. Reference numeral 15 is a variable oil pump, which is connected to the carburetor 13.

The operation of this embodiment having the above structure will be described below.

When the warm air heater is turned on, the vaporizer 13
When the vaporizer 13 reaches the vaporization temperature, the pump 15 is electrified. The fuel supplied from the pump 15 is vaporized by the vaporizer 13, and the vaporized gas is ejected from the nozzle 14 into the burner 2. At this time, the jetting force from the nozzle 14 sucks the surrounding air from the primary air hole 3, and at the same time, a part of the air from the blower 10 is also pushed in from the primary air hole 3 as combustion air. The vaporized gas and the primary air are mixed by a mixing pipe (not shown) in the burner 2 and jetted from the flame hole 4 at the burner outlet to form a flame 9 in the combustion chamber 8.

The flame 9 formed on the flame hole 4 is cooled by the air from the secondary air hole 6 provided in the burner base 5, and when the combustion is weak, the flame 9 near the flame hole 4 is cooled by excess secondary air. Good combustion can be achieved without the generation of carbon monoxide. Further, in the case of strong combustion, the flame 9 near the flame hole 4 can perform the stable combustion, but at the upper part of the flame 9, only the secondary air from the secondary air hole 6 of the burner base 5 is insufficient. Secondary air behind the flame 9 is added from the secondary air opening 11 on the rear surface of the combustion chamber 8, and as secondary air in front of the flame 9, the secondary air inlet 12 on the side surface of the combustion chamber 8 is added.
By blowing air from above, the front surface of the flame 9 can be wrapped with the secondary air, so that the flame 9 does not come into contact with the front surface of the combustion chamber 8 and carbon monoxide is not generated, and complete combustion occurs.
Moreover, the front surface of the combustion chamber 8 is not overheated.

[0019]

As described above, according to the present invention, the secondary air opening is provided on the rear side of the combustion chamber, and the secondary air holes are provided on the front side and the rear side of the burner base, or only on the front side. Since the opening area of the air holes is equivalent to the opening area of the primary air holes of the burner or smaller than the opening area of the primary air holes, and the secondary air inlet is also provided on the upper side of the combustion chamber, weak combustion is achieved. In the case of, it is possible to cool the flame with extra secondary air, or to perform good combustion without the generation of carbon monoxide without flicker, and in the case of strong combustion, the flame near the flame hole can be stably burned and the upper part of the flame In addition, the secondary air from the burner base secondary air holes is used to burn the shortage, the secondary air behind the flame is added from the secondary air opening on the rear surface of the combustion chamber, and it is burned as secondary air in front of the flame. Secondary air introduction on the side of the chamber The front of the flame can be wrapped with secondary air by blowing air from the front, the flame does not come into contact with the front of the combustion chamber, there is no generation of carbon monoxide or soot, and the front of the combustion chamber is completely burned. It has the effect of preventing abnormal heating.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a combustion device of a warm air heater according to an embodiment of the present invention.

FIG. 2 is an external perspective view of a main part of a combustion device of the hot air heater.

FIG. 3 is a cross-sectional view showing a conventional combustion device for a warm air heater.

[Explanation of symbols]

 2 Burner 3 Primary air hole 5 Burner base 6 Secondary air hole 7 Air chamber 8 Combustion chamber 10 Blower 11 Secondary air opening 12 Secondary air inlet 13 Vaporizer 15 Pump

Claims (5)

[Claims] 1. A carburetor (13) connected to a pump (15) for feeding a variable amount of oil, a burner (2) opposite to the carburetor (13), and a burner (2) held by the carburetor. A burner base (5), an air chamber (7) surrounding the burner (2) and provided below the burner base (5), a combustion chamber (8) surrounding the flame from the burner (2), and this combustion chamber An air blower (1) provided at the rear of (8) for variable air flow
0) and the secondary air opening (11) is provided at the rear side of the combustion chamber (8), and the secondary air is introduced into the upper side surface of the combustion chamber (8). Mouth (1
2) A hot air heater combustion device characterized by being provided. 2. A secondary air hole (6) is provided on the front side and the rear side of the burner (2) of the burner base (5),
The combustion device for a warm air heater according to claim 1, wherein the opening area of the secondary air hole (6) is equivalent to the opening area of the primary air hole (3) of the burner (2). 3. A secondary air hole (6) is provided on the front side and the rear side of the burner (2) of the burner base (5),
2. The combustion device for a warm air heater according to claim 1, wherein the opening area of the secondary air hole (6) is smaller than the opening area of the primary air hole (3) of the burner (2). 4. The secondary air hole (6) is provided only in front of the burner (2) position of the burner base (5), and the opening area of the secondary air hole (6) is the primary air of the burner (2). The combustion device for a hot air heater according to claim 1, wherein the predetermined area is smaller than the opening area of the hole (3). 5. The combustion device for a warm air heater according to claim 1, wherein the burner base (5) has no secondary air holes (6).