JP3500217B2 - Mounting structure of sound-absorbing packing in combustion equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion device, and more particularly to a mounting structure for a sound absorbing packing provided on a guide plate for guiding exhaust gas.

[0002]

2. Description of the Related Art In a general gas combustion apparatus, a heat exchanger is installed above a 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, and a guide plate arranged inside the cover. The combustion exhaust gas that has risen through the heat exchanger passes through the exhaust passage formed by the side wall of the cover and the guide plate and is exhausted to the outside from the exhaust port that is the 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 is partially curved to improve the flow of exhaust gas.

By the way, various measures have been taken in the combustion device to prevent noise, and as a part thereof, a sound absorbing packing is provided on the back side of the guide plate. This sound absorbing packing is
It is exposed to the exhaust passage through the opening formed in the guide plate and absorbs the combustion sound transmitted through the exhaust passage. Conventionally, the sound absorbing packing has been attached by being sandwiched between the back wall and the upper wall of the cover and the guide plate. Also,
As another method, the sound absorbing packing is held by a plurality of elongated holding plates, and both ends of the holding plate are spot-welded to the guide plates.

[0004]

With the former method of mounting, it was difficult to accurately position the sound absorbing packing in accordance with the opening of the guide plate. Further, in the latter mounting method, a new component is required for mounting the sound absorbing packing, and the mounting work is complicated, and the mounting cost is high.

[0005]

According to a first aspect of the present invention, there is provided a guide plate forming an exhaust passage for guiding combustion exhaust gas to an exhaust port, and an opening provided on the back surface of the guide plate and formed in the guide plate. In the combustion device provided with the sound absorbing packing exposed to the exhaust passage through the mounting hole is formed in the sound absorbing packing, and the tongue piece is integrally formed at the edge of the opening of the guide plate. It is characterized in that it is inserted into the mounting hole and is bent along the back surface of the guide plate on the side opposite to the opening, and the sound absorbing packing is sandwiched between the tongue piece and the guide plate. According to a second aspect of the present invention, in the sound absorbing packing mounting structure according to the first aspect, the opening of the guide plate has a substantially rectangular shape, and the sound absorbing packing has a substantially rectangular shape having a larger area than the opening. The opening is formed at least at four corners of the opening, and the mounting holes are also formed at four corners of the sound absorbing packing. According to a third aspect of the present invention, in the sound absorbing packing mounting structure according to the second aspect, an exhaust unit is installed on the heat exchanger, and the exhaust unit has a front opening and a bottom opening provided as the exhaust opening. A box-shaped cover and the guide plate disposed inside the cover are provided, and the guide plate extends from the lower end of the back wall of the cover to the front end of the upper wall and is formed in a curved shape. In the combustion device in which the opening is divided into a large number of small opening portions by the bridged grid portion, and the packing is curved along the curved shape of the guide plate, the tongue piece includes the trailing edge and the leading edge of the opening. It is characterized in that it is formed in.

[0006]

According to the first aspect of the invention, the tongue piece formed integrally with the edge of the opening of the guide plate is raised from the guide plate, and after the raised tongue piece is inserted into the mounting hole of the sound absorbing packing, it is opposite to the opening. The sound absorbing packing can be easily attached by bending it to the side along the back surface of the guide plate.
Further, the sound absorbing packing can be accurately positioned only by inserting the tongue piece of the guide plate into the mounting hole of the sound absorbing packing. Moreover, since the tongue piece is obtained by punching to form the opening, no new component is required to attach the sound absorbing packing, and thus the cost does not increase. According to the invention of claim 2, since the four corners of the substantially rectangular sound absorbing packing are fixed, the sound absorbing packing can be stably attached at a more accurate position. Further, it is possible to prevent the sound absorbing effect from being reduced due to the corners being turned up. In the invention of claim 3, even if the sound absorbing packing is curved along the guide plate, since the front edge portion and the rear edge portion of the sound absorbing packing are fixed, the sound absorbing packing can be attached in close contact with the lattice portion of the guide plate, A good sound absorbing effect can be maintained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The gas combustion apparatus shown in FIG. 2 includes a burner unit 10 having a built-in gas burner, a fan (not shown) attached to the lower end of the burner unit 10, and a heat exchanger 20 attached to the upper end of the burner unit 10.
Exhaust unit 30 attached to the upper end of the heat exchanger 20
And a housing (not shown) that accommodates these components.

The exhaust unit 30 includes a cover 31 and
Rain return board 32, guide plate 33, sound absorbing packing 3
4 and. The cover 31 has an upper wall portion 31a.
And a back wall 31b and a pair of side walls 31c,
It has a box shape with an opening at the front and bottom. Back wall 3
1b and a flange 31x extending horizontally from the lower end edges of the pair of side walls 31c are fixed to the upper end flange 20x of the heat exchanger 20. The front opening of the cover 31 is provided as an exhaust port 35, and an exhaust top (not shown) is fixed thereto. Further, the bottom opening of the cover 31 is connected to the heat exchanger 20.

On the pair of side walls 31c of the cover 31,
The rain board 32 is suspended. The rain board 32 is inclined so as to be lowered toward the exhaust port 35.

The guide plate 33 is made of a thin metal plate.
The back wall 3 of the cover 31 disposed inside the cover 31
It extends from the lower end of 1b to the front end of the upper wall 31a. That is, the guide plate 33 is the back wall 31 of the cover 31.
It has a standing portion 33a facing b, a curved portion 33b connected to the upper edge of the standing portion 33a, and an inclined portion 33c extending from the front edge of the curved portion 33b substantially parallel to the rain return board 32. . A horizontally extending flange 33x is formed at the lower end of the rising portion 33a of the guide plate 33, and a vertically extending flange 33y is formed at the front edge of the inclined portion 33c.
Are formed. Spot welding the flange 33x to the flange 31x at the lower end of the back wall 31a of the cover 31,
The guide plate 33 is fixed to the cover 31 by spot welding the flange 33y to the flange 31y formed on the upper wall 31a of the cover 31.

The guide plate 33, the pair of side walls 31c of the cover 31, and the rain board 32 make up the heat exchanger 20.
An exhaust passage 36 is formed for flowing the combustion exhaust gas that has risen through as shown by the arrow.

As shown in FIGS. 1 and 3, the guide plate 33 has a substantially rectangular opening 37 formed therein. The rear edge of the opening 37 is located at the rising portion 33a of the guide plate 33, and the front edge thereof is located at the front portion of the inclined portion 33c. The opening 37 is divided into a large number of small opening portions 37a by a lattice portion 33z spanning the periphery of the opening.

The sound absorbing sheet 34 is provided on the back side of the guide plate 33 (the side opposite to the exhaust passage 36). The sound absorbing sheet 34 has a substantially rectangular shape with an area larger than the opening 37, closes the opening 37, and its four sides are arranged outside the four sides of the opening 37. The sound absorbing sheet 34 is in contact with the lattice portion 33z and is exposed to the exhaust passage 36 through the opening portion 37a. This sound absorbing sheet 3
At 4, the combustion sound transmitted through the exhaust passage 36 is absorbed.

Next, the sound absorbing sheet 3 which is a characteristic part of the present invention
The mounting structure of No. 4 will be described. As shown in FIGS. 1 and 3, both end portions of the rear edge of the opening 37 of the guide plate 33 (that is, two corner portions of the opening 37) and both end portions of the front edge (that is, the opening 3).
7 and the other two corners of the front edge, and the tongue piece 3
3f is integrally formed. On the other hand, the sound absorbing sheet 34 has mounting holes 34a formed at positions corresponding to the tongue piece 33f, that is, at two positions in the middle between the four corners and the front edge. Then, the tongue piece 33f of the guide plate 33 is inserted into the mounting hole 34a of the sound absorbing packing 34, and the tongue piece 33f is opened.
The sound absorbing packing 34 is bent along the guide plate 33 on the opposite side to the tongue piece 33f and the guide plate 33.
It is sandwiched between and attached.

In the above mounting structure, the tongue piece 33f integral with the guide plate 33 is used. The tongue piece 33f can be obtained by usual molding of the guide plate 33 without adding any special process. That is, the guide plate 33 is formed through a two-step processing process of press punching and press bending, and in this punching process, the tongue piece 33f is simultaneously formed when the opening portion 37a is formed.

The mounting work of the sound absorbing packing 34 will be described in more detail. The tongue piece 33f of the guide plate 33 is shown in FIG.
As shown in FIG. 5, in the initial state, it is flush with the other part of the guide plate 33. When attaching the sound absorbing packing 34, first, the tongue piece 33f is raised so as to be substantially at right angles to the other portions. Then, the raised tongue pieces 33f are inserted through the mounting holes 34a of the sound absorbing packing 34. After this,
The front tongue piece 33f is tilted forward and bent along the back surface of the inclined portion 33c of the guide plate 33, and the rear tongue piece 33f is tilted downward and bent along the back surface of the standing portion 33a of the guide plate 33. After that, the guide plate 33 is fixed to the cover 31 by the above-described spot welding or the like. At this time, since the sound absorbing packing 34 is already attached to the guide plate 33, spot welding can be performed with good workability without paying attention to positioning of the sound absorbing packing 34.

As described above, the tongue piece 33 of the guide plate 33 is used.
The sound absorbing packing 34 can be easily attached only by bending f. In addition, the mounting hole 3 of the sound absorbing packing 34
Only by inserting the tongue piece 33f of the guide plate 33 into the 4a, the sound absorbing packing can be positioned accurately. Further, since the four corners of the sound absorbing packing 34 are fixed, the sound absorbing packing 34 can be stably attached at a more accurate position, and the sound absorbing effect can be prevented from being reduced due to the curling of the corners. Further, even if the sound absorbing packing 34 is curved along the guide plate 33, since the front edge portion and the rear edge portion of the sound absorbing packing 34 are fixed, the sound absorbing packing 34 uses the lattice portion 33z of the guide plate 33 and the peripheral edge of the opening 37. It can be attached in close contact with the part, and a good sound absorbing effect can be maintained.

The present invention is not limited to the above embodiment, and various modes are possible. For example, the tongue piece 33f may be formed on the pair of side edges of the opening 37 and the lattice portion 33z.

[0019]

As described above, according to the first aspect of the invention, the sound absorbing packing can be easily attached only by bending the tongue piece. Further, the sound absorbing packing can be accurately positioned only by the mounting hole of the sound absorbing packing and the tongue piece of the guide plate. Moreover, no new parts are required for mounting the sound absorbing packing, which does not increase the cost. According to the invention of claim 2, the sound absorbing packing can be stably attached to a more accurate position. Further, it is possible to prevent the sound absorbing effect from being reduced due to the corners being turned up.
In the invention of claim 3, the sound absorbing packing can be attached in close contact with the lattice portion of the guide plate, and a good sound absorbing effect can be maintained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a mounting structure of a sound absorbing packing according to the present invention.

FIG. 2 is a vertical cross-sectional view showing a schematic configuration of a combustion device to which the mounting structure is applied.

FIG. 3 is a perspective view showing a guide plate before mounting the sound absorbing packing.

[Explanation of symbols]

10… Burner unit 20 ... Heat exchanger 30 ... Exhaust unit 31… Cover 31a ... Upper wall 31b ... Back wall 31c ... Side wall 33 ... Guide plate 33b ... Bending part 33f ... tongue 33z ... Lattice part 34 ... Sound absorbing packing 34a ... Mounting hole 35 ... Exhaust port 36 ... Exhaust passage 37 ... Opening 37a ... Opening part

Claims (3)

(57) [Claims] 1. A guide plate forming an exhaust passage for guiding combustion exhaust to an exhaust port, and a sound absorbing packing exposed on the exhaust passage through an opening formed in the guide plate on the back surface of the guide plate. In the combustion device having the above-described structure, a mounting hole is formed in the sound absorbing packing, and a tongue piece is integrally formed at an edge of the opening of the guide plate. The tongue piece is inserted into the mounting hole and is opposite to the opening. A sound absorbing packing mounting structure in a combustion device, characterized in that the sound absorbing packing is bent to the side along the back surface of the guide plate, and the sound absorbing packing is sandwiched between the tongue piece and the guide plate. 2. The opening of the guide plate has a substantially rectangular shape, the sound absorbing packing has a substantially rectangular shape having a larger area than the opening, and the tongue pieces are formed at least at four corners of the opening. The mounting structure for a sound absorbing packing in a combustion device according to claim 1, wherein the mounting holes are also formed at four corners of the sound absorbing packing. 3. An exhaust unit is installed on the heat exchanger,
The exhaust unit includes a box-shaped cover having a front opening and a bottom opening provided as the exhaust port, and the guide plate arranged inside the cover, and the guide plate is provided on the back wall of the cover. It is formed to extend from the lower end to the front end of the upper wall and is curved, and the opening is divided into a large number of small opening portions by the lattice portion that is bridged over the peripheral edge of the opening, and the packing is curved along the curved shape of the guide plate. 3. The structure for mounting sound absorbing packing in a combustion device according to claim 2, wherein the tongue piece is formed at a rear edge and a front edge of the opening.