JP4710404B2 - Exhaust pipe - Google Patents

Description

  The present invention relates to an exhaust pipe that is attached to a combustion apparatus and is used to guide and discharge combustion exhaust gas (exhaust gas) generated by combustion in the combustion apparatus to the outside.

  Conventionally, as this kind of exhaust pipe, there is one provided in a water heater that burns gas or petroleum as fuel and heats the incoming water by heat of combustion. In this water heater, a heat exchange can body with a built-in heat exchanger is joined to a combustion can body with a built-in combustion burner, and an exhaust pipe (“exhaust assembly” is placed on the heat exchange can body. Cylinder "or" exhaust port cover ") is joined. The exhaust tube collects exhaust gas generated from the combustion burner and passes through the heat exchanger, or deflects the direction of the flow (for example, deflects from upward to lateral). The exhaust gas is guided to the exhaust outlet and discharged to the outside (see, for example, Patent Document 1). In this Patent Document 1, an exhaust pipe is disclosed which is configured by combining a body casing formed by breath molding a metal plate into a predetermined shape and other constituent members similarly formed by breath molding a metal plate. Installed inside the body casing is a deflecting member that has both a draining function for discharging rainwater that may invade by blowing from the exhaust outlet and a deflecting function for deflecting the flow direction of the exhaust gas. It is also disclosed to do.

JP 2003-21320 A

  By the way, since the exhaust outlet of the exhaust pipe is opened from the water heater toward the outside, when the water heater is installed outdoors, it is generated on the inner surface near the exhaust outlet due to the influence of intrusion of rainwater or the like. There is a possibility of rusting. When rusting occurs, even if the function itself is not affected, the rusting touches the eyes of the user or the like through the opening, which may result in a loss of aesthetic product value.

  As a countermeasure for this, if the entire components constituting the inner surface of the opening where rainwater may enter from the exhaust outlet is made of corrosion-resistant material, or if it is formed without using corrosion-resistant material, the surface It can be considered that a decorative board formed of a corrosion-resistant material is installed on the side. For example, as shown in FIG. 4 and FIG. 5, the bottom surface when the inside is viewed from the front opening of the main body casing 701 that constitutes an exhaust pipe that covers the upper surface of the heat exchange can 4 and opens the exhaust outlet 52 forward. All of the deflecting members 702 constituting the lower surface) are formed of a corrosion-resistant material, or the decorative plate member 703 formed of the corrosion-resistant material with respect to a range that can be seen on the upper surface side when viewed from the front opening. It fits into the casing 701, and so on.

  However, if such measures are taken, inconveniences such as excessive quality in corrosion resistance, an increase in the number of parts, an increase in manufacturing man-hours, and an increase in manufacturing costs occur. It will be. That is, if all of the deflecting members 702 are formed of a corrosion-resistant material, they are formed of the corrosion-resistant material even in a range in which rainwater does not enter, and the quality in the range is excessive. Further, when the decorative board member 703 is additionally provided, the number of parts and the number of manufacturing steps are increased. In addition, the increase in the number of parts, etc., together with the above-mentioned excessive quality, leads to an increase in manufacturing cost.

  The present invention has been made in view of such circumstances, and the object of the present invention is to eliminate the above inconveniences, and in particular the occurrence of inconveniences such as deterioration of product value due to rusting as described above. It is an object of the present invention to provide an exhaust pipe that does not cause excessive quality as described above or increase the number of parts, manufacturing steps, manufacturing costs, etc.

In order to achieve the above object, according to the first aspect of the present invention, the combustion apparatus is attached to exhaust the exhaust gas generated by the combustion operation from the exhaust outlet to the outside, and guides the exhaust gas to the exhaust outlet. The following specific items were provided for the exhaust pipe provided with the main casing. That is, in the main body casing , the first metal plate portion having high corrosion resistance and the second metal plate portion which is a metal plate material of a different type from the first metal plate portion are continuously integrated with each other across the boundary line. integrally formed as by using a composite metal sheet material formed as a single material single piece by being butt welded to, and, at the front section and scope else is in the range of the side of the exhaust outlet The front part is formed by the first metal plate part while the other part is formed by the second metal plate part by forming the boundary line so as to be located at the boundary with a certain other part. (Claim 1).

In this invention, since the front region is a range of the exhaust outlet side of the main body casing is formed by the first metal plate portion having a high corrosion resistance, the appearance for a long time without rusting even if rainwater invades while capable of maintaining, other sites that can be ing formed by the second metal plate selected from a metallic material that can meet the requirements of strength and cost rather than high corrosion resistance. Thereby, it is possible to avoid the occurrence of inconveniences such as an increase in manufacturing cost due to excessive quality when all are formed of a corrosion-resistant material and an increase in the number of parts and the number of manufacturing steps due to the addition of extra parts such as a decorative board member. Might teeth, rather than as two components divided body casing separately, because they be formed integrally as a single piece, parts and assembly due to the addition of extra components upon assembly into the combustion device it also has a name that lead to inconvenience steps increases. In addition, using the composite metal plate material, the boundary line between the first metal plate portion and the second metal plate portion of the composite metal plate material is located at the boundary between the front side portion and other portions that are other than that range. By defining the relative positional relationship as described above, it can be easily and efficiently formed as a single component.

  In the second invention, the exhaust outlet is attached to the combustion apparatus to exhaust the exhaust gas generated by the combustion operation from the exhaust outlet to the outside, and returns the rainwater entering from the exhaust outlet to the exhaust outlet side. The following specific matters are provided for an exhaust pipe provided with a deflecting member disposed in a downward slope toward the front. That is, the deflection member is integrally formed as a single component, while the range on the exhaust outlet side is formed by the first metal plate portion having high corrosion resistance, and the other range is different from the first metal plate portion. It was made to be formed of the 2nd metal plate part which is a kind of metal plate material (Claim 2).

  In the case of this invention as well, since the range on the exhaust outlet side of the deflecting member is formed by the first metal plate portion having high corrosion resistance, it does not rust even if rainwater enters and can maintain its aesthetics for a long time. The other range can be formed by the second metal plate portion selected from a metal material that can satisfy the requirements on strength and cost, not high corrosion resistance. Moreover, since the deflecting member is integrally formed as a single part rather than as two separate components, the number of parts and the number of assembling steps associated with the addition of extra parts when assembling to the combustion device There is no inconvenience such as increase.

The deflection member is made of a composite metal plate material formed as a single material by butt welding the first metal plate portion and the second metal plate portion so as to be continuous with each other across the boundary line. Ru can be formed using. By doing so, it can be formed easily and efficiently as a single component.

As the "range of the side of the exhaust outlet" in the exhaust stack of the above invention, it is possible to set a range that can be visually recognized inside from the outside through an exhaust outlet (Claim 3). By doing in this way, the effect | action of preventing the internal rusting seen through an exhaust outlet and maintaining aesthetics over a long term can be implement | achieved reliably.

Further, in the exhaust pipe of the above invention, the first metal plate portion and stainless steel, a second metal plate portion may be a surface treated steel sheet (claim 4). By doing in this way, the combination of the different metal plate materials called the first and second metal plate portions can be specified, and both the prevention of rusting within a predetermined range on the exhaust outlet side and the suppression of the increase in manufacturing cost can be achieved. It will be.

As described above, according to the exhaust pipe of any one of claims 1 to 4 , in the exhaust pipe constituent member such as the main body casing or the deflecting member, the range on the exhaust outlet side is the first metal plate having high corrosion resistance. Metallic material that can meet the requirements of strength and cost instead of high corrosion resistance, while being able to maintain aesthetics for a long time without rusting even if rainwater enters, The second metal plate portion selected from the above can be used. In addition, since the above-mentioned component members are formed integrally as a single component rather than as two separate components, the number of components associated with the addition of extra components during assembly to the combustion device There is no inconvenience that the number of assembly steps increases. According to claim 1, such an effect can be obtained for the main body casing, and according to claim 2, the deflecting member can be obtained.

Furthermore, it is possible to avoid the occurrence of inconveniences such as an increase in manufacturing cost due to excessive quality when all are formed of a corrosion-resistant material, and an increase in the number of parts and the number of manufacturing steps due to the addition of extra parts such as a decorative plate member. Further, in the case of the main casing of claim 1, the first metal plate portion and the second metal of the composite metal plate material are used at the boundary between the front side portion and the other portion which is the other range by using the composite metal plate material. By forming the relative positional relationship so that the boundary line with the plate portion is positioned, it can be easily and efficiently formed as a single component.

According to the third aspect of the present invention , it is possible to surely realize the effect of preventing internal rusting seen through the exhaust outlet and maintaining the aesthetics for a long time.

Furthermore, according to claim 4 , the combination of different metal plate materials, ie, the first and second metal plate portions, is specifically specified to prevent rusting within a predetermined range on the exhaust outlet side and to suppress an increase in manufacturing cost. It becomes possible to achieve both.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a combustion apparatus 1 for fluid heating to which an embodiment of the present invention is applied. This combustion apparatus 1 is applied to a heat source machine such as a water heater, a bath tub, a hot water circulation heater, and the like, when passing a target fluid (water in the case of a water heater) through a heat exchanger. The heat is exchanged by the combustion heat from the combustion burner and supplied above. Specifically, the combustion apparatus 1 includes a combustion can body 3 in which a combustion burner for receiving gas or oil is received by receiving supply of combustion air from a blower fan 2 and heat exchange in which a heat exchanger is incorporated. A can body 4 and an exhaust cylinder 5 are provided, and such a combustion apparatus 1 is accommodated in a case 61 of the heat source unit 6 (see FIG. 2).

  In the heat exchange can body 4, a fin-and-tube heat exchanger 41 (see FIG. 2) including a large number of fins and a tube penetrating the fins is installed. The exhaust pipe 5 is connected to the heat exchange can body 4 so as to cover the top opening of the heat exchanger 41 in a sealed state.

  The exhaust cylinder 5 includes a main body casing 51, an outlet member 53 for forming an exhaust outlet 52, and a deflection member 54. The main body casing 51 and the deflecting member 54 are formed as integral and independent components by breath molding using a predetermined metal plate material described later.

  The main body casing 51 has a mountain shape that opens downward and forward (leftward in FIG. 2) and has an inner side recessed upward, and the left and right sides and the rear side (FIG. 2) except for the front side (left side in FIG. 2). The peripheral flange portion 511 for connection is integrally formed on the three sides (on the right side of FIG. 5), and the front end opening edge 512 is integrally formed on the front side. The outlet member 53 is formed in an oval cylindrical shape, and is connected to the front end opening edge 512 of the main body casing 51 so as to face the outside from the front lid 611 of the case 61. It has become so. Further, the deflection member 54 has a bottom wall portion 541 that forms a downward slope from the rear side to the front side of the exhaust tube 5, and a rear end position of the bottom wall portion 541 from the top to the front. A water return portion 542 that is bent and bounces back intruding rainwater, and side walls 543 and 543 that are continuous with the left and right sides of the bottom wall portion 541 are integrally provided.

  Such connection of the exhaust tube 5 to the heat exchange can 4 is performed as follows. For example, the deflection member 54 is assembled inside the main body casing 51, and the peripheral flange portion 511 is connected to the peripheral flange 42 at the upper end of the heat exchange can body 4 by means of spot welding or the like in this assembled state, and finally the outlet member 52 is connected to the front end opening edge 512.

  In such a combustion apparatus 1, the combustion burner of the combustion can body 3 is combusted while water is passed through the heat exchanger 41, and the water is heat-exchanged and heated by this combustion heat. On the other hand, after the exhaust gas generated by the combustion operation (see the dotted arrow in FIG. 2) passes between the fins of the heat exchanger 41 and between the tubes from the bottom to the top, it is guided by the lower surface of the deflecting member 54 to the exhaust cylinder. 5, the flow direction is changed to the front side, and the air is discharged from the exhaust outlet to the outside through the upper side of the deflecting member 54.

  In the exhaust pipe 5 having the above structure, the main casing 51 and the deflecting member 54 are each formed using a specific metal plate material. That is, the main body casing 51 and the deflecting member 54 are formed using a composite metal plate material in which a plurality of types (two types in this embodiment) of metal plate materials having different characteristics are combined and integrated. The main casing 51 and the deflecting member 54 are each formed of two kinds of metal plate materials, a first metal plate portion M1 and a second metal plate portion M2, which are divided into specific ranges with a boundary line m interposed therebetween. In the main body casing 51, the range from the front end opening edge 512 to the rear dimension L1 (front side portion; the range indicated by mesh hatching in FIG. 1) is the other range (other portions) by the first metal plate portion M1. ) Are formed by the second metal plate portion M2. Further, in the deflecting member 54, the range of the dimension L2 from the front end to the rear (front side portion; the range indicated by the mesh hatching in FIG. 1) is the other range (other portions) by the first metal plate portion M1. The second metal plate portions M2 are respectively formed.

  As the first metal plate portion M1, a material particularly excellent in corrosion resistance is set, and as the second metal plate portion M2, a material selected from the viewpoint of strength and cost is set. For example, the first metal plate portion M1 may be a stainless steel material such as stainless steel or a heat resistant steel having a Cr content of about 11%, and the second metal plate portion M2 may be a hot-dip aluminum plated steel plate or a galvalume steel plate. A surface-treated steel sheet is mentioned.

  The front part of the main body casing 51 and the front part of the deflecting member 54 are in contact with the user's eyes when looking into the interior of the exhaust cylinder 5 from the exhaust outlet 52, and the range of rainwater entering from the exhaust outlet 52. It is determined based on. For this reason, in the example shown in the figure, the dimension L1 of the main body casing 51 that is difficult to see above the exhaust outlet 52 is smaller than the dimension L2 of the deflection member 54 that is positioned below and easy to see farther than the main body casing 51. This also shows an example where the setting is short. Of course, the dimension L1 may be set equal to the dimension L2.

FIG. 3 shows the principle of the method of forming the composite metal plate material M and the method of forming the main casing 51 and the like using the composite metal plate material M. First, the first metal plate material S is unwound from the roll, and at the same time, the second metal plate material G is also unwound from the roll so that the edges S1 and G1 in the width direction adjacent to each other are close to each other. Both the first and second metal plate materials S and G are allowed to flow downstream (lower side in the figure) at a constant speed. The adjacent edges S1 and G1 are butted on the same plane, and the butted portion is laser welded by a laser welding machine R and butt welded. As a result, the butt welding site that becomes the boundary line m extends in a straight line on the downstream side, and the first metal plate part M1 made of the first metal plate material S and the second metal plate material G sandwich the boundary line m. A flat strip-shaped (flat plate) composite metal plate material M in which the second metal plate portion M2 made of the composite is integrated is formed as a single material. Note that TIG welding (Tungsten-insert-gas arc welding) or the like may be adopted as the butt welding described above. Next, whether or not the composite metal sheet material M is press-molded in synchronism with the traveling thereof. Alternatively, the main body casing 51 and the deflection member 54 using the composite metal plate material M are formed by either press forming in a line different from the production line. This press molding is performed so that the boundary line m passes through a predetermined position (position of the dimension L1 or L2) with respect to the main body casing 51 or the deflecting member 54. In FIG. 3, the position where the main casing 51 is press-formed in relation to the boundary line m with respect to the composite metal plate material M is indicated by a dotted shape line. In this way, the relative positional relationship between the composite metal plate material M and the press forming object (for example, the main body casing 51) is set so that the boundary line m passes through a predetermined position (position of the dimension L1 from the front end opening edge 512). What is necessary is just to press-mold after defining.

  According to the exhaust pipe 5 described above, the manufacturing cost increases due to the excessive quality when all the rainwater from the exhaust outlet 52 easily enters and prevents rusting in a range that is visible from the outside, and is formed entirely of a corrosion-resistant material. In addition, it is possible to avoid the occurrence of inconveniences such as an increase in the number of parts and the number of manufacturing steps due to the addition of extra parts such as a decorative plate member. Moreover, it is possible to eliminate all rusting at the end face and the bent portion of the first metal plate M1, and maintain the aesthetics even when used for a long period of time, thereby suppressing the loss of product value.

<Other embodiments>
In addition, this invention is not limited to the said embodiment, Various other embodiments are included. That is, in the said embodiment, although both the main body casing 51 and the deflection | deviation member 54 are formed with the composite metal plate material M, not only this but only either one should be formed with the composite metal plate material M. Also good.

  Further, the present invention can be embodied in various forms of exhaust stacks regardless of the above embodiment. That is, as long as a part of the exhaust pipe that is opened to the outside from the combustion device to discharge the exhaust gas to the outside is formed of a corrosion-resistant material, the form of the exhaust pipe is not limited. It is included in the present invention.

  Further, in the above embodiment, press forming or the like is shown as the processing method, but other processing methods may be added or used instead.

It is a disassembled perspective view which shows embodiment of this invention. FIG. 2 is a cross-sectional explanatory view in which the upper part of the combustion apparatus of FIG. 1 is partially cut away. It is plane explanatory drawing which shows the principle of the formation method of a composite metal plate material. FIG. 2 is a diagram corresponding to FIG. 1 for explaining the problem of the present invention. FIG. 5 is a diagram corresponding to FIG. 2 for the combustion device of FIG. 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Combustion apparatus 5 Exhaust pipe 51 Main body casing 52 Exhaust outlet 54 Deflection member m Boundary line M Composite metal plate material M1 1st metal plate part M2 2nd metal plate part

Claims (4)

To the combustion device, is attached to exhaust the exhaust gas generated due to the combustion actuating the exhaust outlet to the outside, the exhaust gas an exhaust pipe having a main body casing for guiding to said exhaust outlet,
The present body casings grayed includes a first metal plate portion having a high corrosion resistance, integrally continuous with each other across the second metal plate and has a border of a different kind of metal plate material and the first metal plate portion The composite metal plate material formed as a single material by butt welding so as to be integrally formed as a single part, and at the front side portion which is the range on the exhaust outlet side and other ranges By forming the boundary line so as to be located at the boundary with a certain other part, the front part is formed by the first metal plate part, while the other part is formed by the second metal plate part. that have been made,
Exhaust cylinder, characterized in that. It is attached to the combustion device in order to exhaust the exhaust gas generated by the combustion operation from the exhaust outlet to the outside, and the rainwater entering from the exhaust outlet to the inside is inclined downward toward the exhaust outlet so as to return to the exhaust outlet side. An exhaust pipe provided with a deflecting member disposed,
The deflection member is integrally formed as a single part, while the range on the exhaust outlet side is formed by the first metal plate portion having high corrosion resistance, and the other range is different from the first metal plate portion. An exhaust pipe characterized by being formed of a second metal plate portion which is a metal plate material. An exhaust stack according to claim 1 or claim 2,
An exhaust pipe in which a range in which the inside can be visually recognized from the outside through the exhaust outlet is set as the range on the exhaust outlet side. An exhaust stack according to claim 1 or claim 2,
The exhaust pipe, wherein the first metal plate portion is a stainless steel plate and the second metal plate portion is a surface-treated steel plate.

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