JP3474296B2 - Exhaust unit for outdoor installation type combustion device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outdoor type combustion apparatus, and more particularly to improvement of an exhaust unit thereof.

[0002]

2. Description of the Related Art Combustion devices, such as gas combustion devices, are of the type installed outdoors for use. In this type of combustion device, a heat exchanger is installed above the burner unit, and an exhaust unit is installed above it. This exhaust unit has a box-shaped cover having a front opening and a bottom opening, a rain return board spanned between both side walls of the cover, and a guide plate arranged inside the cover. There is. The combustion exhaust that has risen through the heat exchanger is
It is discharged to the outside through an exhaust passage formed by a side wall of the cover, a guide plate and a rain return board, and an exhaust port which is a front opening of the cover. The guide plate extends from the lower end of the back wall of the cover to the front end of the upper wall, and the portion facing the intersection of the back wall and the upper wall is curved to improve the flow of exhaust gas.

The above-mentioned rain return board plays a role of preventing rain water from entering the burner. Actual Kaihei 3-27559
The rear end of the rain board was attached to and supported by the supporting portions on both side walls of the cover, as disclosed in Japanese Patent No.

[0004]

The exhaust unit having the above structure has the following drawbacks. That is, the guide plate is spring-backed after being formed into a curved shape by press working. Therefore, the separation distance between the guide plate fixed to the cover and the rain return board is not the designed distance, and it is difficult to make the flow cross-sectional area of the exhaust passage a desired cross-sectional area. Therefore, the tongue piece along the side wall of the cover is bent and formed in the middle portion of both side edges of the guide plate,
When the guide plate is attached to the cover, the tongue pieces are spot-welded to both side walls of the cover to position the guide plate to secure a desired flow cross-sectional area. However, this method has a drawback that the number of work steps is increased by the spot welding to the cover of the tongue.

[0005]

In order to solve the above problems, in the invention of claim 1, a box-shaped cover having a front opening and a bottom opening provided as an exhaust port, and a space between both side walls of the cover. And a guide plate arranged inside the cover. The guide plate extends from the lower edge of the back wall of the cover to the front edge of the upper wall and is formed in a curved shape. The exhaust unit of the outdoor-installed combustion apparatus in which the combustion exhaust rising from the bottom opening of the cover is discharged from the exhaust port through the exhaust passage formed by the guide plate, the rain return board and both side walls of the cover. The guide plate is formed of an elastically deformable thin plate, its front edge portion and rear edge portion are fixed to the cover, and both side edge portions thereof are movable with respect to both side walls of the cover. of A support unit provided on the back side of the side wall,
The rain return board has a pressing member extending upward at a rear end portion, and in a state where the rear end portion of the rain return board is supported by the support portion, the pressing member presses while elastically deforming the guide plate. It is characterized by According to the invention of claim 2,
2. The exhaust unit according to claim 1, wherein the supporting portion is provided so as to project inward from a side wall of the cover, the rain return board has side plates as pressing members on both sides, and the side plates extend along the side wall of the cover. It is characterized in that the rear end portion of the rain return board is press-fitted between the support portion and the guide plate in a state where the rear end portion of the side plate is placed against the guide plate. According to a third aspect of the present invention, in the exhaust unit according to the second aspect, the support portion is configured by a part of a side wall of the cover bulging inward. According to a fourth aspect of the present invention, in the exhaust unit according to the second or third aspect, an abutting portion that abuts the guide plate is bent and formed at an upper end of a rear end portion of the side plate of the rain return board. .

[0006]

According to the invention of claim 1, the guide plate is formed of a thin plate, and only the front and rear edges of the guide plate are fixed to the cover and the side edges thereof are not fixed to the side wall of the cover, so that the guide plate can be elastically deformed. Attach it to the cover. Since the pressing member pushes the guide plate while elastically deforming the guide plate in a state where the rear end part of the rain catcher board is supported by the support parts of both side walls of the cover, the distance between the rear end part of the rain catcher board and the guide plate is Since it is determined by the size of the pressing member and is not affected by the springback of the guide plate, the desired distance can be set as designed, and thus the flow cross-sectional area of the exhaust passage can be made the desired cross-sectional area as designed. it can. As a result, combustion as designed can be realized. Further, it is possible to omit the spot welding process which has been conventionally performed to position the guide plate. In the invention of claim 2, since the pressing member is formed by the side plate along the side wall of the cover, the smooth flow of the exhaust gas can be secured. In addition, the rain return board, between the support portion provided on the side wall of the cover and the guide plate,
Since the guide plate is attached by press-fitting while elastically deforming, the attaching work is simple and the attached state can be stabilized. According to the invention of claim 3, the support portion on which the rain board is placed is configured by inflating the side wall of the cover inwardly, which does not require a component to be added for the support portion, and the component and the side wall. The spot welding process can be omitted. According to the fourth aspect of the invention, since the contact portion is bent and formed at the upper end of the rear end portion of the side plate, a stable contact state with the guide plate can be obtained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The outdoor-installed gas combustion apparatus shown in FIG. 1B has an exhaust unit 1, a heat exchanger 2 fixed to the lower end of the exhaust unit 1, and a burner unit fixed to the lower end thereof and having a built-in gas burner (illustration). No), a fan (not shown) fixed to the lower end of the fan, and a housing (not shown) that accommodates these components.

The exhaust unit 1 includes a cover 10, a guide plate 20, and a rain return board 30. The cover 10 includes an upper wall 11, a back wall 12, and a pair of side walls 1.
3 and has a box shape in which the front portion and the bottom portion are opened. A flange 14 extends horizontally from the back wall 12 and the lower end edges of the pair of side walls 13, a flange 15 extends vertically from the front edge of the upper wall 11, and the side wall 13 also has a flange 16 (FIG. 2). (See) is extended. The flange 14 is fixed to the upper end flange 2x of the heat exchanger 2 with a screw or the like. As shown in FIGS. 1 and 2, the flange 1
At the lower end of 6, an auxiliary frame 40 having a substantially L-shaped cross section is provided.
Both ends of the auxiliary frame 40 are fixed.
A water drop receiver 41 is fixed to the. The front opening of the cover 10 is provided as an exhaust port 50. Also,
The bottom opening of the cover 10 is connected to the heat exchanger 2.

An important feature of the structure of the cover 10 is a support portion 17 for supporting the rain return board 30 in the inner part of both side walls 13 of the cover 10 as shown in FIGS.
Is formed. The support portion 17 is formed by inflating the side wall 13 inward. The upper surface of the support portion is flat and is inclined so as to be lower toward the exhaust port 50.

The guide plate 20 is disposed inside the cover 10, and extends from the lower end of the back wall 12 of the cover 10 to the upper wall 1.
1 over the front end. That is, the guide plate 2
0 is an upright portion 21 facing the back wall 12 of the cover 10,
The back wall 1 of the cover 10 connected to the upper edge of the upright portion 21.
2, a curved portion 22 that faces the intersection of the upper wall 11, a horizontal portion 23 that extends forward from the front edge of the curved portion 22, and a horizontal portion 23 that extends forward from the front edge of the horizontal portion 23 and toward the exhaust port 40. It has the inclination part 24 which inclines so that it may become low.

A horizontally extending flange 25 is formed at the lower end of the rising portion 21 of the guide plate 20, and a vertically extending flange 26 is formed at the front edge of the inclined portion 24. The flange 25 is attached to the back wall 11 of the cover 10.
Of the flange 1 formed on the upper wall 11 of the cover 10 by spot welding to the flange 14 at the lower end of the cover 10.
The guide plate 20 is fixed to the cover 10 by spot welding to the cover plate 5. A sound absorbing sheet 60 is provided on the back side of the guide plate 20. The sound absorbing sheet 60 is exposed to an exhaust passage 55 described later through a large number of openings (not shown) of the guide plate 20. The sound absorbing sheet 60 absorbs the combustion sound transmitted in the exhaust passage 55.

An important feature of the structure of the guide 20 is that the guide plate 20 is a thin metal plate (thickness: 0.3 to 0.6 m).
m) and the side edges of the guide plate 20 are covered with the cover 10.
That is, it is not fixed to the side wall 13 and can move freely.
As a result, the guide plate 20 is elastically deformable. In addition,
In the figure, the plate thickness of the guide plate 20 is exaggerated and shown to the same extent as the plate thickness of the cover 10 and the like for easy viewing.

As shown in FIG. 1 (B), the rain board 30 is mounted so as to be stretched over a pair of side walls 13 of the cover 10. The rain return board 30 is substantially parallel to the inclined portion 24 of the guide plate 20 and is inclined downward toward the exhaust port 50. The rear end of the rain catching board 30 is separated from the standing portion 21 of the guide plate 20. This rain return board 30 and the guide plate 20
The pair of side walls 13 of the cover 10 form an exhaust passage 55 through which the combustion exhaust gas that has risen through the heat exchanger 2 flows as indicated by the arrow.

The structure of the rain return board 30 will be described before it is described in detail. Figure 1
(B), as shown in FIG. 3 and FIG.
Is a rain return plate 31, a packing 32 made of heat-resistant fiber, and a holding plate 3 for pressing the packing 32 in order from the bottom.
Equipped with 3. A large number of openings 33a (only shown in FIG. 4) for exposing the packing 32 are formed in the holding plate 33.

An important feature of the structure of the rain return board 30 is that a pair of side plates 34 (pressing members) extending upward orthogonally to the rain return plate 31 are integrally formed on both side edges of the rain return plate 31. That is. An abutting portion 34a extending substantially horizontally is bent and formed at the upper end of the rear end portion of the side plate 34.

Further, the rain board 30 is provided with an auxiliary frame 35 at the front end thereof. This auxiliary frame 35
Has a U shape when viewed from the front and has an upper plate portion 35a and both side plate portions 35b. The side plate portions 35b are fixed to the front end portion of the side plate 34, and the upper plate portion 35a is located above the front end portion of the rain return plate 31. Upper plate part 35
Flange 35c and 35d are formed in the rear edge of a and the side plate part 35b, respectively. A positioning protrusion 35e is formed on the flange 35c.

The rain board 30 is attached as follows. That is, the rain return board 30 is inserted through the exhaust port 50, and the rear end portion thereof is press-fitted between the support portion 17 formed on the side wall 13 of the cover 10 and the horizontal portion 23 of the guide plate 20. As a result, the lower surfaces of both side edges of the rear end portion of the rain return plate 31 are placed on the support portion 17, and the guide plate 20 elastically abuts the abutting portion 34a at the upper end of the rear end portion of the side plate 34. Here, the press-fitting is against the elasticity of the guide plate 20 (in other words, while elastically deforming the guide plate 20),
Means to insert. Therefore, in order to realize this press-fitting, the width W in the direction orthogonal to the inserting direction of the rain catching board 30 shown in FIG.
The width between the upper surface of 4a) and the distance D between the supporting portion 17 and the guide plate 20 in the same direction (see FIG. 1 (A)) must be slightly larger in advance. The force required for press-fitting is determined by the difference between the width W and the distance D, the thickness of the guide plate 20, and the material. preferable.

The press-fitting is completed by the flanges 35c and 35d of the rain return board 30 hitting the flange 26 of the guide plate 20 and the flange 16 of the cover 10, respectively. At this time, the protrusion 35 formed on the flange 35c
e is a hole 26a formed in the flange 26 of the guide plate 20
(Refer to FIG. 2) to insert the rain back board 3
The front end of 0 is positioned. After this, the flange 35
The rain return board 30 is fixed to the cover 10 and the guide plate 20 by spot welding the c and 35d and the flanges 26 and 16, respectively.

In the mounted state of the rain catching board 30, the rear end of the rain catching board 30 has a guide plate 20.
It is stably supported by the elasticity of. The distance between the rear end of the rain return board 30 and the guide plate 20 is determined by the size of the side plate 34 of the rain return board 30 (width W in FIG. 3) to eliminate the influence of the spring back of the guide plate 20. be able to. As a result, the flow cross-sectional area of the exhaust passage 55 (particularly the flow cross-sectional area near the curved portion 22 of the guide plate 20)
Can have a desired cross-sectional area as designed.

The present invention is not limited to the above embodiment, and various modes are possible. For example, the support may be formed by spot welding the bracket to the side wall of the cover. Further, the upper surface of the supporting portion may be horizontal, or the exhaust port 5
It does not have to be sloped down towards zero.
The rear end of the rain-bending board is similar to the above-mentioned prior art,
It may be supported by fitting with the support portion.
The pressing member may be a rod-shaped member that extends upward from the widthwise center of the rear end portion of the rain return board.

[0021]

As described above, according to the invention of claim 1, the flow cross-sectional area of the exhaust passage can be set to a desired cross-sectional area as designed without being affected by the springback of the guide plate. As a result, combustion as designed can be realized. Further, it is possible to omit the spot welding process which has been conventionally performed to position the guide plate. Claim 2
According to the invention, the smooth flow of the exhaust gas can be ensured, the work of attaching the rain return board is easy, and the attachment state can be stabilized. According to the third aspect of the invention, the support portion on which the rain board is placed can be formed without the spot welding step. According to the invention of claim 4, a stable contact state of the side plate with the guide plate can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an exhaust unit of a combustion apparatus according to the present invention, (A) showing a state before attachment of a rain board and (B) showing a state after attachment.

FIG. 2 is a front view of the exhaust unit showing a state before the rain catching board is attached.

FIG. 3 is a vertical cross-sectional view of a rain board.

FIG. 4 is a plan view of the rain return board.

[Explanation of symbols]

1 ... Exhaust unit 2 ... Heat exchanger 10… Cover 11… Top wall 12… Back wall 13 ... Side wall 17 ... Supporting part 20 ... Guide plate 22 ... Curved part 30… Rain board 34 ... Side plate (pressing member) 34a ... Abutting part 50 ... Exhaust port 55 ... Exhaust passage

Claims (4)

(57) [Claims] 1. A box-shaped cover having a front opening and a bottom opening provided as an exhaust port, a rain board suspended between both side walls of the cover, and the above-mentioned cover arranged inside the cover. The guide plate is formed so as to extend from the lower edge of the back wall of the cover to the front edge of the upper wall and to be curved, and the combustion exhaust rising from the bottom opening of the cover is guided by the guide plate and the rain. In an exhaust unit of an outdoor-installed combustion apparatus, which is discharged from the exhaust port through an exhaust passage formed by both side walls of a return board and a cover, the guide plate is formed of an elastically deformable thin plate, and a front edge portion thereof is formed. And the rear edge of the cover is fixed to the cover, both side edges of the cover are movable with respect to both side walls of the cover. At the far end Has a pressing member extending towards, in a state where the inner end of the rain-back board is supported by the supporting portion,
An exhaust unit for an outdoor installation type combustion apparatus, wherein the pressing member presses the guide plate while elastically deforming the guide plate. 2. The support portion is provided so as to project inward from a side wall of the cover, the rain return board has side plates as pressing members on both sides, and the side plates are arranged along the side wall of the cover. The back end of the rain gutter board is press-fitted between the support portion and the guide plate with the upper end of the back end of the side plate being in contact with the guide plate. Exhaust unit of outdoor installed combustion device. 3. The exhaust unit for an outdoor installation type combustion apparatus according to claim 2, wherein the support portion is formed by bulging inward a part of a side wall of the cover. 4. The outdoor-type combustion according to claim 2, wherein an abutting portion that abuts on the guide plate is bent and formed at an upper end of a rear end portion of a side plate of the rain catching board. Exhaust unit of the device.