JPH056086B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a combustion device such as an oil hot air heater.

Conventional Technology In recent years, with heating appliances using oil and gas combustion devices, there has been a demand for combustion devices that can adjust combustion over a wide range from low to high calorie due to increasing awareness of comfort, energy conservation, etc. There is. An example of such a combustion device will be explained below with reference to Figs. 3 and 4. 1 is a bottomed cylindrical vaporizing cylinder, and the inside is a mixing section for vaporizing fuel and mixing it with air. There is. Reference numeral 2 denotes a cylindrical burner head attached above the opening of the vaporization cylinder 1, which has a narrow cylinder part 3 with an integrated throttle at the bottom, and a plurality of elongated flame holes 4 provided in the peripheral wall. ing. Reference numeral 5 denotes a burner lid that covers the upper part of the burner head 2, and together with a heat insulating lid 6 disposed below the burner lid, the burner head is connected to the burner head through a tightening portion 7 that passes through the inside of the burner head 2 from the vaporizing cylinder 1 side toward the burner lid 5. It is attached to 2. Reference numeral 8 denotes a pressure equalizing plate provided within the burner head 2, which has a plurality of small holes 8a and covers the narrow cylindrical portion 3. Reference numeral 9 denotes a mixing cylinder in the form of a ceiling cylinder that covers the pressure equalizing plate 8, and is placed below the burner head 2. Reference numeral 10 designates a perforated cylinder provided in close contact with the outer peripheral side wall of the burner head 2, stretched so as to cover the plurality of flame holes 4, and made of wire mesh or a porous material.

The operation of the combustion apparatus configured as described above will be explained below. First, the mixed gas vaporized and premixed in the vaporization cylinder 1 flows into the burner head 2 through the narrow cylinder part 3 provided above the vaporization cylinder 1. This mixed gas that has flowed in passes through the small hole 8a of the pressure equalizing plate 8 covering the cylinder portion 3, and is ejected from the upper part of the mixing cylinder 9. Here, since the upper part of the burner head 2 is covered and sealed with a burner lid 5 and a heat insulating lid 6 via a tightening part 7, the mixed gas is ejected from the flame hole 4 provided in the peripheral wall of the burner head 2 and A flame is formed around the outer circumference of 10.

Problems to be Solved by the Invention However, in order to maintain good combustion conditions from strong combustion with a large combustion amount to weak combustion with a small combustion amount in the above configuration, it is necessary to prevent the flame from lifting from the four sides of the flame hole during strong combustion. In order to prevent this, the jetting speed of the mixed gas jetting out from the flame hole 4 must be suppressed. For this purpose, the opening area of the flame hole 4 is made large,
That is, measures have been taken to reduce the flame hole load and slow down the flow rate of the mixed gas ejected from the flame hole 4. By this means, good combustion is achieved during strong combustion, but under the best combustion conditions during weak combustion, the ejection speed of the mixed gas is reduced, so the flame adheres too closely to the perforated cylinder 10 near the flame hole 4, and the perforated cylinder 10 The burner head 2 becomes red hot and becomes hot, and eventually exceeds the heat resistance of the porous cylinder 10 and breaks, or the burner head 2
This caused backfire combustion inside the tank. That is, there was a problem in that it was extremely difficult to simultaneously prevent the above-mentioned expansion of the combustion width and the damage caused by the red heat of the porous tube 10 itself.

As a countermeasure to this problem, the present inventor considered arranging small hole-shaped auxiliary flame holes 4b in a horizontal row near and above the main flame hole 4a, as shown in Fig. 5. . When the auxiliary flame holes 4b are arranged in a row, the main flame hole 4a and the auxiliary flame hole 4b mutually strengthen flame holding, making lifting combustion difficult. In this way, the flame holding tendency is strengthened, and the overall flame hole load of the branch flame holes 4, which suppresses the above-mentioned lifting combustion, can be increased, and the temperature of the porous tube 10 is reduced as a result. However, even in this combustion device, the mixed gas ejected from the flame hole 4 facing the clamping part 7 flows downstream from the clamping part 7, so the amount of mixed gas is smaller than that of the other flame holes 4, and as a result, As a result, the flame hole load becomes locally small, and the porous tube 10 becomes red hot, causing heat resistance problems.

The present invention solves the above-mentioned problems by preventing a local temperature rise in the porous cylinder, expanding the combustion range without causing lifting combustion, and maintaining a good combustion state even if the combustion conditions change slightly. The purpose of the present invention is to provide a combustion device that can obtain the following.

Means for Solving the Problems In order to achieve this object, the combustion device of the present invention includes a burner head with a flame hole, a main flame hole, and an auxiliary flame hole with a smaller opening than the main flame hole provided near the main flame hole. Among the auxiliary flame holes, the auxiliary flame hole facing the tightening part is made smaller than the other auxiliary flame holes, or is made non-porous.

Effect With this configuration of the present invention, the main flame hole facing the tightening part has a large flame hole load by the amount of the nearby auxiliary flame hole being made into a small hole or a non-porous part. The area between the main flame hole and the auxiliary flame hole, which is easy to burn, no longer exists. Therefore, the porous tube in the main flame hole section facing the tightening section will not become red hot locally, and the combustion range as a burner can be expanded without causing heat resistance problems, and the combustion conditions will not change to some extent. Good combustion conditions can be obtained even when the fuel is heated.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. In Figures 1 to 2, 11
is a cylindrical vaporizing cylinder with a bottom, and the inside thereof is a mixing part 11a for vaporizing fuel and mixing it with air. Reference numeral 12 designates a cylindrical burner head attached above the opening of the vaporizing cylinder 11, and has a narrow cylindrical portion 13 with an integrated throttle at its lower part. 14 is a burner lid that covers the upper part of the burner head 12;
It is attached to the burner head 12 through a tightening part 16 that passes through the inside of the burner head 12 from the mixing part 11a side toward the burner cover 14 side, together with the heat insulating cover 15 disposed below.
Reference numeral 17 denotes a pressure equalizing plate provided inside the burner head 12, which has a plurality of small holes 17a and has a narrow cylindrical portion 1.
It covers 3. Reference numeral 18 denotes a mixing cylinder with a ceiling cylinder that covers the pressure equalizing plate 17, and is placed below the burner head 12. 19 is the burner head 1 mentioned above.
The flame holes are provided in the peripheral wall of No. 2, and include a plurality of main flame holes 19a in the shape of vertically elongated holes, and auxiliary flame holes 19b in the shape of small holes smaller than the main flame holes 19a, which are provided in a row horizontally above the main flame holes 19a. It is made up of. This auxiliary flame hole 19b has a non-porous portion 19c at a portion opposite to the tightening portion 16. 20 is a porous cylinder provided in close contact with the outer peripheral side wall of the burner head 12;
It is stretched so as to cover the plurality of flame holes 19, and is made of wire mesh.

The operation of the combustion device configured as described above will be explained below.

A mixed gas in which fuel vaporized in the vaporization tube 11 and combustion air are premixed flows into the burner head 12 through a narrow cylindrical portion 13 provided above the vaporization tube 11. This inflowing mixed gas passes through the small hole 17a of the pressure equalizing plate 17 covering the cylinder part 13, and then passes through the small hole 17a of the pressure equalizing plate 17 covering the cylinder part 13
It is ejected from the upper opening. The upper part of the burner head 12 is covered and sealed with a burner lid 14 and a heat insulating lid 15 via a tightening part 16, so that the mixing cylinder 1
The mixed gas ejected from the burner head 12 is ejected from the flame hole 19 provided in the peripheral wall of the burner head 12, and forms a flame around the outer periphery of the porous cylinder 20. Here, in this combustion device,
Auxiliary flame holes 19b with openings smaller than the main flame hole 19a are provided in a row horizontally above the main flame hole 19a, and the auxiliary flame holes 19b facing the tightening part 16 are arranged in a non-porous part 19c.
As a result, the following effects can be obtained. That is, first, the flame formed in the auxiliary flame hole 19b is as follows.
Since the opening is smaller than the main flame hole 19a, the flame holding power is stronger than the main flame hole 19a.Moreover, in this embodiment, since the auxiliary flame hole 19b is provided near and above the main flame hole 19a, the flame in the main flame hole 19a This will increase the heat retention capacity of the flame. Therefore, the flame formed in the main flame hole 19a mutually interferes with the flame in the auxiliary flame hole 19b and strengthens the flame holding.
Lifting combustion is extremely difficult to perform as a burner. In this way, the overall flame hole load of the branch flame holes 19 in which lifting combustion is suppressed can be increased, and as a result, the temperature of the porous cylinder 20 is reduced.
As already mentioned, on the other hand, in the flame hole 19 facing the tightening part 16, the flame hole load is smaller compared to other flame holes because of the wake of the tightening part 16.
The temperature of the porous tube 20 increases the most, causing heat resistance problems, but since the auxiliary flame hole 19b facing the clamping part 16 is provided as a non-porous part 19c, the clamping part 1
The main flame hole 19a facing the flame hole 6 has a flame hole load increased by the amount of the non-porous part 19c, and the part between the main flame hole 19a and the auxiliary flame hole 19b, which is most likely to become red-hot, is eliminated. Therefore, it is possible to prevent the porous tube 20 from becoming red hot locally, and it is also possible to prevent problems with the heat resistance of the porous tube 20 and associated combustion defects such as backfire.

In the above embodiment, the case where the auxiliary flame hole facing the tightening part is made non-porous is explained as an example, but the same effect can be obtained even if the auxiliary flame hole is made smaller than the other auxiliary flame holes.

Effects of the Invention As is clear from the above description of the embodiments, according to the present invention, lifting combustion can be prevented and the combustion width can be expanded, and localized red heat and damage of the porous cylinder can be prevented, and backfire can be prevented. It is possible to provide a combustion device that is highly safe and has excellent durability and is free from combustion defects such as.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a combustion device according to an embodiment of the present invention, FIG. 2 is a front view of a burner head, FIG. 3 is a sectional view of a conventional combustion device, FIG. 4 is a front view of the burner head, and FIG. The figure is a front view of a burner head in another conventional example. 11a...Mixing section, 12...Burner head, 14...
Burner lid, 16... Tightening part, 19... Flame hole, 19a
...Main flame hole, 19b...Auxiliary flame hole, 19c...No hole part,
20...Porous cylinder.

Claims (1)

[Claims] 1. A mixing section that mixes air and fuel, a cylindrical burner head that burns the mixed gas from the mixing section through a plurality of flame holes, a burner lid attached to cover the top of the burner head, and a burner head that covers the inside of the burner head. The burner head is equipped with a tightening part that penetrates from the mixing part side toward the burner lid side and fixes the burner lid in close contact with the burner head, and a perforated tube arranged on the outer periphery of the peripheral wall of the burner head, and the flame holes of the burner head are connected to the main flame. It consists of a hole and an auxiliary flame hole with an opening smaller than the main flame hole provided near the main flame hole, and among the auxiliary flame holes, the auxiliary flame hole facing the tightening part is smaller than the other auxiliary flame holes. Combustion device, either porous or solid.