JP3529936B2 - Surface combustion burner device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface-combustion burner device used for household water heaters, gas stoves and the like.

[0002]

2. Description of the Related Art Conventionally, a thin metal wire (for example, a wire diameter of 20 μm to 30 μm) having a high resistance to high-temperature oxidation is uniformly distributed to form a mat having a thickness of 1 mm to 4 mm, which is used for a household water heater, a gas stove, or the like. It is considered to be used in the surface combustion burner device of Such a surface combustion burner device fixes the above mat to the casing in the combustion device,
The mixed gas for combustion is supplied from the back side.

FIG. 8 is a sectional view of a main part of a conventional surface combustion burner apparatus using a felt-like mat of fine metal wires. In this surface combustion burner device, the mat 1 is fastened to the casing 43, to which the mixed gas supply pipe 4 is connected at the rear end, with a long mounting bolt 45 via a cylindrical heat insulating material 42, and an empty space is provided inside. Demarcated. A rectifying plate 8 is provided in this chamber.

[0004]

Here, although the mat 1 is conventionally fastened by the bolts 45 as described above,
When burning, heat is generated from the bolts exposed on the combustion surface of the casing 4.
The cylindrical heat insulating material 42 interposed to prevent transmission to the 3 has poor machinability such as a fastening hole due to its material, and its strength is low, so that it cannot be sufficiently tightened with bolts. There is a problem that not only the mounting property is bad but also the gas sealing property is bad.

The present invention has been made in view of the above-mentioned problems of the prior art, and its main purpose is to improve the mounting property and the sealing property of the surface combustion mat of the surface combustion burner device to the casing. Especially.

[0006]

According to the present invention, the above object is a surface combustion burner apparatus for passing a mixture of combustion gas and air from the back surface side for combustion on the surface thereof. And a ventilation hole that is provided integrally with the mat on the base end surface side of the mat that is contradictory to the combustion surface of the mat and that can ensure air permeability between the front surface and the back surface, and has at least expanded. possess a broad support plate than the mat in a state, the support plate, supporting the said mat
The part not attached has a mounting part to the casing,
Supplying the air-fuel mixture from the base end face with the attachment part
It is attached to the pipe side, and the mixture is mixed inside with the casing.
This is achieved by providing a surface-combustion burner device characterized in that it defines a chamber for aeration diffusion . Particularly, it is preferable that the edge portion of the mat has a small thickness .

Here, the surface combustion mat has a high temperature on the combustion surface, but is cooled to 200 ° C. or lower because it is cooled by the gas on the gas upstream side. In addition, since the mat itself does not have a bolt or the like that transfers heat from the combustion surface, the support plate does not become hot. Therefore, the support plate can be directly attached to the casing without using a heat insulating material.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view of a main part of a surface combustion burner device according to a first embodiment to which the present invention is applied. This surface combustion burner device is made of a heat-resistant metal thin wire having a wire diameter of 20 to 100 μm and a mat 1 which is integrated with the mat 1 on the base end face side of the mat by adhesion or the like, and is made of a metal wider than the mat 1. The support plate 2 and the bottomed cylindrical casing 3 to which the mixed gas supply pipe 4 is connected at the base end are provided, and the edge portion (attachment portion) of the support plate 2 extending laterally from the mat 1 is provided. The free end flange 3a of the casing 3 is fastened with a mounting bolt 5 to define an empty chamber 6 inside.
A large-diameter ventilation hole 2 that can ensure ventilation in the center of the support plate 2.
a has been opened. An elastic body seal 7 is provided between the edge of the support plate 2 and the free end flange 3 a of the casing 3. A rectifying plate 8 is provided inside the vacant chamber 6.

In practice, the elastic body seal 7 can be omitted if the sealability between the edge of the support plate 2 and the free end flange 3a of the casing 3 can be secured. The support plate 2 may be made of a material such as resin as long as it has a heat resistance of about 200 ° C. Further, the mat 1 may be attached to the support plate 2 by any of adhesion, welding, and caulking, and these may be combined as necessary.

FIG. 2 is a sectional view of an essential part of a surface combustion burner apparatus similar to FIG. 1 in the second embodiment to which the present invention is applied, and the same reference numerals are given to the same portions as FIG. Proof, and detailed description thereof is omitted. In this example, the support plate 12 is provided with a large number of small holes 12a instead of the large diameter ventilation holes. In this way, the small holes 12a act as a current plate, so that the current plate can be omitted. Further, in this structure, since the mat 1 is supported over the entire surface, deformation of the mat can be prevented. The other structure is similar to the example of FIG.

[0012] In the past, in order to manufacture a mat, fine metal wires are compressed and sintered, and although the strength can be secured, the cost is high because the sintering is performed in an oxygen-free state.
In the present invention, as shown in FIG. 2 in particular, since the support plate can secure a certain level of strength, the mat does not necessarily require strength. Therefore, it is possible to reduce the cost by using a mat that only mechanically entangles the fine wires with each other by needle punching or the like during compression without sintering.

FIG. 3 is a sectional view of an essential part of a surface combustion burner apparatus similar to FIG. 1 in a third embodiment to which the present invention is applied. Proof, and detailed description thereof is omitted. In this example, the support plate 22 has the tubular portion 22b, not the casing 23. Then, the casing 23 is fastened to the casing 23 with bolts 25 on the proximal end side of the tubular portion 22b. The other structure is shown in Figure 1.
Is similar to the example. Here, in this structure, the tubular portion 22b
As shown in FIG. 4, the support plate 22 can be made substantially the same in size as the mat 1, and can be made compact. The other structure is similar to the example of FIG.

FIG. 5 is a cross-sectional view of an essential part of a surface combustion burner apparatus similar to FIG. 1 in a fourth embodiment to which the present invention is applied. In this example, the support plate 32 forms a casing. Therefore, it is more excellent in sealability and mountability than the above examples. The other structure is similar to the example of FIG.

In each of the above examples, since the mat 1 has a thickness, the mixed gas also flows out from the side edge of the mat having good air permeability and burns. As a result, when the support plate may become hot, as shown in FIG.
The side edges may be closed with a ceramic powder, for example, boron nitride powder, to form the closed portion 1a, so that the gas does not leak by eliminating the air permeability. Further, as shown in FIG. 7, the thickness of the edge portion of the mat 1 may be reduced to eliminate air permeability.

[0016]

As is apparent from the above description, according to the surface combustion burner apparatus of the present invention, the air permeability between the front and back surfaces is provided on the base end surface side opposite to the combustion surface of the mat in which a large number of fibers are entangled. A support plate that has a vent hole that can secure the space and is wider than this mat is provided, and the support plate is attached to the casing with an attachment portion provided on a portion of the support plate that does not support the mat. Since the heat of the mat is hardly transferred to the support plate, it is possible to increase the flexibility of the support plate material, shape mounting method, durability and sealing property, that is, for surface combustion. The matt mounting property to the casing and the sealing property are improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a surface combustion burner device according to a first embodiment to which the present invention is applied.

FIG. 2 is a sectional view of an essential part similar to FIG. 1 of a surface combustion burner apparatus according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a main part similar to FIG. 1 of a surface combustion burner apparatus according to a third embodiment of the present invention.

4 is a cross-sectional view of a main part of a surface combustion burner device showing an application example of the example shown in FIG.

FIG. 5 is a cross-sectional view of a main part similar to FIG. 1 of a surface combustion burner apparatus according to a fourth embodiment of the present invention.

FIG. 6 is a cross-sectional view of a main part of a surface combustion burner device showing an application example of the examples shown in FIGS.

FIG. 7 is a cross-sectional view of a main part of a surface combustion burner device showing an application example of the examples shown in FIGS.

FIG. 8 is a sectional view of a main part of a conventional surface combustion burner device.

[Explanation of symbols]

1 Surface burning mat 1a Blocking part 2 Metal support plate 2a vent 3 casing 3a Free end flange 4 Mixed gas supply pipe 5 mounting bolts 6 vacant rooms 7 Elastic seal 8 straightening plate 12 Support plate 12a small hole 22 Support plate 22b tubular part 23 casing 25 mounting bolts 32 Support plate 42 Cylindrical insulation 43 casing 45 mounting bolt

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-8-28826 (JP, A) JP-A-5-172315 (JP, A) JP-A-8-28823 (JP, A) Jikken Sho-39- 34745 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) F23D 14/14-14/18

Claims (4)

(57) [Claims] 1. A surface-combustion burner device in which a mixture of combustion gas and air is passed from the back surface side to burn on the surface thereof, and a mat formed by entangling a large number of fibers, and a combustion surface of the mat. opposite proximal surface the mat and provided integrally on, has a vent hole that can ensure proper ventilation between front and back, and possess a broad support plate than the mat while at least deployment and, If the support plate does not support the mat,
It has a mounting part to the casing and
Installed on the supply pipe side of the air-fuel mixture with respect to the base end face.
And a chamber for diffusing the air-fuel mixture inside together with the casing.
The surface-combustion burner device is characterized by defining 2. The surface combustion burner apparatus according to claim 1, wherein the edge portion of the mat has a reduced thickness . Wherein said support plate is directly or prior Symbol casing
The surface combustion burner device according to claim 1 or 2 , wherein the surface combustion burner device is attached via a seal member . 4. The surface-combustion burner device according to claim 1, wherein the support plate supports the mat over substantially the entire surface thereof.