JPS6280415A - Combustion device - Google Patents

Abstract

PURPOSE:To provide a combustion device enabling a characteristic of combustion and an expansion of a range of combustion to be promoted more by a method wherein an inward- directed wall facing toward an annular upright wall of a heat recovery ring is arranged at the upper end part of a burner case, and an annular small clearance is formed between the inward-directed wall and the annular upright wall. CONSTITUTION:Fuel supplied from a fuel supplying pipe 13 is dispersed into a gasification chamber 14 by a centrifugal force of an atomization unit 12 and gasified therein. The gasified fuel is premixed with a primary air to be fed under pressure within a gasification chamber 14 through a primary air hole 6 under a rotation of an air supplying fan 2. The mixed gas passes through a metering plate 18 and is flowed into a burner head 19, ignited with a spark electric discharge of a spark plug 27 when it is injected from flame holes 21 at a circumferential wall to form a flame 29 and then the fuel is ignited. In turn, a large volume of secondary air introduced from the secondary air holes 7, 7... into a burner case 24 pass through small holes 23, 23... with an aeration resistance of an inner directed wall 25 arranged at the upper end part of the burner case 24. Thus, it is possible to make a proper increase in volume of secondary air flowing into a clearance between the flame holes 21 and the annular upright wall 22C and then to promote substantially a secondary combustion of the fuel.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an indoor open combustion type combustion device such as a kerosene fan heater.

(B) Prior art In this type of conventional combustion equipment, a heat recovery ring is provided at the upper end of the burner body, located on the outer periphery of the burner head, which has flame holes on one side of the circumference. A plurality of small holes are provided in the horizontal part between the annular standing wall and the burner body, and the secondary air introduced into the burner case surrounding the outer periphery of the burner body is passed through the small holes between the flame hole and the annular standing wall. JP-A No. 60-4713 discloses a device designed to supply the same.

()) Problems to be Solved by the Invention In the above-mentioned conventional technology, the distance between the upper end of the burner case and the annular vertical wall of the heat recovery ring is wide.

Most of the secondary air introduced into the burner case passes through this wide gap with low ventilation resistance, and is supplied between the flame hole and the annular vertical wall through the small hole provided in the horizontal part of the heat recovery ring. The amount of secondary air that is supplied is small, and if the filter installed in the air supply path becomes clogged, or if the air supply amount is reduced during weak combustion, secondary air cannot be efficiently supplied. There were drawbacks.

The present invention has been made in view of the above problems, and
The object of the present invention is to provide a combustion device that can further enhance combustion characteristics and combustion range.

(-) Means for Solving the Problems The present invention provides a heat recovery ring located at the outer periphery of a burner head having flame holes in the peripheral wall and provided at the upper end of the burner body;
a burner case that surrounds the outer periphery of the burner body and into which secondary air is introduced; In a combustion device in which a plurality of small holes are provided to supply secondary air between the flame hole and the annular standing wall, the annular standing wall of the heat recovery ring is provided at the upper end of the case. An inward facing wall is provided, and a small annular opening is formed between the inward facing wall and the annular standing wall.

(River action) The secondary air introduced into the space between the burner case (241 and the burner body (9) [23)
The amount of secondary air passing through (23) increases and a large amount of secondary air can be efficiently supplied between the 1-6 flame hole (2I) and the annular vertical wall (22C).

Air blows out like an air curtain along the outer surface of the annular standing wall (22C) from the annular small opening (9) between the inward facing wall (C) and the annular standing wall (22C), so that the annular V wall ( 22
C) can be prevented from being abnormally heated and thermally deformed, and the spread of flame can be effectively suppressed.

(f) Example An embodiment of the present invention will be described based on the drawings.

In the figure, (1) represents the air supply fan (2) and burner motor (3).
), and an air supply pipe (4) for introducing indoor air into the air supply case (1) through a filter (not shown) is provided on the outer periphery of the lower part of the air supply case (1). It is connected. Further, the air supply case (1) is formed by joining an upper body (IA) and a lower body (IB) at their open end sides, and the lower body (
IB) is fitted with a partition plate (5). (6) is a primary air hole opened approximately at the center of the upper part of the upper body (of one person).

(7) (7)... is a plurality of secondary air holes arranged in a ring shape on the outside of the secondary air hole (6), t8H8)... is the upper body centering around the secondary air hole (6). (IA) A plurality of arcuate rectifying vanes radially hanging down from the upper inner surface of the (IA).

(9) connects the air supply case (1) through the insulation material (10).
A sheathed heater circle is embedded in one peripheral wall of the burner body, which is connected in communication with the upper part. (12 is a dehydrator that sprays fuel supplied from the fuel supply pipe 03 into the vaporization chamber side of the burner body (9) using centrifugal force, and is directly connected to the motor shaft a9 of the burner motor (3). . Further, the fuel supply pipe α3) communicates with an oil storage tank (17) such as a leveler via an electric pump (16) whose pumping amount can be varied in multiple stages. Furthermore, the burner motor (3) uses a DC motor whose rotation speed can be varied linearly or in multiple steps by changing the DC power supply voltage, and the electric pump ( The amount of combustion can be changed by varying the pumping amount of step 16). The Q mallet is a diaphragm plate installed in the upper opening of the burner body (9), and the kiln is the burner head attached to the upper opening of the burner body (9) from above the diaphragm plate (1). A plurality of flame holes Cυ(2+) with wire mesh attached are formed in the part, and the mixed gas sent from the vaporization chamber side is ejected to the side. ) is a heat recovery ring made of stainless steel plate whose fitting part (22A,) is fitted to the outer periphery of the upper end of the burner body (9), and a plurality of small holes t23) (23)... are bored therein. On the outer peripheral edge of the horizontal part (22B), there is a flame hole I facing the flame hole Cυ.
21), forming an annular standing wall (22C) surrounding the periphery.

Q(a) is a burner case that surrounds the outer periphery of the burner body (9), and includes a case lower body (24A) fixed on the air supply case (1) via the heat insulating material αα and an upper opening of the case lower body (24A). A case upper K (24B) connected to will be introduced. Moreover, the case upper body (24B)
is formed by bending the inside of the inward wall toward the two annular standing walls (22C) around the entire upper end of the heat recovery ring, and the inner end of the inward wall (b) and the annular standing wall (22C) A small annular opening with a width t of about 1.5 to 3 inches is formed between the two.

Secondary air is blown out from this annular small opening (A) along the outer surface of the annular vertical wall (22C).

(5) is a spark plug that ignites the mixed gas ejected from the flame hole (2I), and (28) is the flame formed in the flame hole (21).
The side of the flame rod that detects c) is the combustion tube.

- In the configuration described above, the fuel supplied from the 5 fuel supply pipe (L3) is scattered along the vaporization chamber 0 by the centrifugal force of the exposure 2R (12) and vaporized, and the vaporized gas is transferred to the air supply fan (
2) rotates the primary air hole (6) to the vaporization chamber (14).
The primary air pumped into 1 is premixed in the vaporization chamber 0,
The mixed gas passes through the diaphragm plate marked a) at the pump head (l
When it flows into the interior and ejects to the side from the flame hole in the peripheral wall, it is ignited by the spark discharge of the spark plug (5),
Burn by forming a flame. Then, as the flame (C) heats the annular standing wall (22C), the heat of this heat recovery ring is conducted to the burner body (9) side, and even if the sheathed heater (1fJ・＼ is turned off), vaporization will not occur. Can continue.

On the other hand, the secondary air introduced into the burner case e4) from the secondary air holes (7) (from 71...)
4) The inward wall (25) provided at the upper end acts as ventilation resistance, allowing a large amount of air to pass through the small holes - (2 (8)...
) and the annular vertical wall (22C) can be appropriately increased, and secondary combustion can be greatly promoted.

Furthermore, burner case C? 4) The remaining part of the secondary air introduced into the interior passes through the annular small opening (a) and enters the annular vertical wall (22
C) rises along the entire outer circumference of the annular standing wall (22C)
While cooling the air, the flame is ejected 12 in the form of an air curtain, suppressing the spread of the flame.

(G) Effects of the Invention Since the present invention is configured as described above, it has the following effects listed in 1-61 below.

■ Since an inward wall facing the annular standing wall of the heat recovery ring is formed at the two ends of the burner case, the inward wall increases the airflow resistance between the burner case and the heat recovery ring, thereby creating a connection between the annular standing wall and the flame hole. The amount of secondary air supplied during this period can be increased, and the combustion characteristics and combustion range can be further expanded.

■ Since a small annular gap is formed between the inward wall at the upper end of the burner case and the annular standing wall, air can be blown out like an air curtain along the outer surface of the annular standing wall, causing abnormal heating of the annular standing wall. It is possible to prevent thermal deformation due to heat deformation, and also to effectively suppress the spread of flame and protect the combustion tube.

[Brief explanation of drawings]

FIG. 1 is an enlarged cross-sectional view of the toilet portion of FIG. 2, and FIG. 2 is a cross-sectional view of a combustion device that is an embodiment of the present invention. (9)...burner body, (1)...burner head, C cape...flame hole, +22+...heat recovery ring,
(22B)...Horizontal part, (22C)...Annular standing wall,
(23)...Small hole, (24)...Nokuichina case, C■...Inward wall, (26)...Annular small opening. Applicant Sanyo Electric Co., Ltd. and one other agent Patent attorney Shizuo Sano Figure 1

Claims (1)

[Claims] (1) A heat recovery ring located on the outer periphery of the burner head having a flame hole in the peripheral wall and provided at the upper end of the burner body, and a burner case that surrounds the outer periphery of the burner body and into which secondary air is introduced. The heat recovery ring is provided with a plurality of small holes in a horizontal part located between the annular standing wall facing the flame hole and the burner body, and the heat recovery ring is configured to provide secondary air between the flame hole and the annular standing wall. In the combustion apparatus, an inward wall facing the annular standing wall of the heat recovery ring is provided at the upper end of the burner case, and a small annular gap is formed between the inward wall and the annular standing wall. A combustion device characterized by: