JP2002340330A - Combustion device and exhaust pipe therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust pipe for a combustion device which is used for a water heater, a bath heater or the like, and which has a light weight, high hermeticity, low pressure loss, and small occupied volume. SOLUTION: The exhaust pipe 6 is provided with a combustion gas inlet 31 at its lower part for introducing combustion gas, a combustion gas exhaust port 32 at its upper part for discharging combustion gas outside, and a bellows 33 at its middle part. The exhaust port 32 has a circular shape and the inlet 31 has a shape of a slot. The position of the exhaust port 32 of the exhaust pipe 6 is deviated from that of the inlet 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust pipe used for a combustion device such as a water heater or a bath. The invention also relates to a combustion device.

[0002]

2. Description of the Related Art A combustion device such as a water heater or a bath device has a main body case having a predetermined shape, and a burner is built therein. Therefore, it is necessary to supply and exhaust air to and from the internal burner. Further, water heaters and the like are often installed indoors, and it is necessary to discharge combustion gas (exhaust gas) outdoors. For this reason, a water heater or the like is provided with an exhaust pipe for discharging combustion gas generated from the burner to the outside. Hereinafter, the structure of the conventional water heater will be described. FIG. 6 is a front view showing a combustion device according to the related art. FIG. 7 is a perspective view of a conventional exhaust pipe.

[0003] The water heater 100 includes a main body case 10 as shown in the figure.
1 in which a blower 102 and a combustion section 103
, An exhaust pipe 105 and an exhaust collecting tube 106 are built therein. Further, the combustion section 103 includes a combustion case 107 formed in a rectangular tube shape by a copper plate or the like.
09 is attached. A heat exchanger 108 is built in the combustion case 107. An exhaust gas collecting tube 106 is provided below the combustion case 107, and the combustion case 1
07 is connected to an exhaust pipe 105 provided side by side.

Here, the exhaust pipe 105 in the prior art is
It is made by sheet metal processing as shown in FIG. That is, the exhaust pipe 105 of the related art is formed by bending a plate material such as stainless steel to form a quadrangular cylindrical body 111,
At the top, a cylindrical exhaust top 110 is attached. In the prior art, screws 112 and tacks were used to form the cylindrical body 111 and attach the exhaust top 110. Further, screws 112 and studs were similarly used for joining the mating surfaces of the plate members. Further, in the related art, a sealing material is applied to the mating surfaces of the plate members and the mounting surface of the exhaust top 110 for the purpose of preventing leakage of exhaust gas.

[0005]

SUMMARY OF THE INVENTION Prior art exhaust pipe 10
5 was made by bending a plate material such as stainless steel as described above. Therefore, the conventional exhaust pipe 10
No. 5 had a problem that the weight was heavy. In addition, since screws 112 and studs are used to join the mating surfaces of the plate members, it takes time to fasten these. Furthermore, when employing the structure of the prior art, a sealing material must be interposed at the mating surface between the plate materials in order to prevent leakage of exhaust gas, which not only increases the cost of purchasing the sealing material but also applies the sealing material. It took time. Also, it was difficult to determine whether or not the sealing material was sufficiently functioning from the outside, and there was a concern about reliability.

Further, it is desirable that the exhaust top 110 has a circular cross section in view of connection with an external duct.
On the other hand, since the cylindrical body 111 is desirably a quadrangular prism in order to secure processing requirements and a cross-sectional area, the cross-sectional shape changes abruptly at the joint between the two. Therefore, the conventional exhaust pipe 105 has a problem that the flow resistance is large, the pressure loss is large, and the exhaust load is high. Further, an environmental problem has been pointed out that the noise required by a blower or the like is high because the load required for exhaust is high. In addition, the exhaust pipe 105 of the related art has a large occupied volume to secure a predetermined cross-sectional area because the exhaust pipe 105 is a combination of plate materials and has a rectangular column shape. Therefore, there was also a dissatisfaction that the external shape of the combustion device became large.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, and it has a light weight, is easy to manufacture, has high airtightness, has a low pressure loss, and has a small occupied volume. The purpose is to develop exhaust pipes for equipment. Another object of the present invention is to develop a combustion apparatus that solves the same problem.

[0008]

According to the first aspect of the present invention, there is provided a combustion apparatus comprising a part or the whole of a series of exhaust gas passages for communicating a combustion device with the outside. An exhaust pipe for a device, which is formed by deforming an integral pipe body, has a combustion gas inlet for introducing combustion gas, and a combustion gas outlet for discharging combustion gas to the outside, wherein the combustion gas introduction port And a combustion gas outlet formed in different shapes.

The exhaust pipe for a combustion apparatus according to the present invention is formed by deforming an integral pipe, so that it has high airtightness and does not require a sealing material or the like. Moreover, since the combustion gas introduction port and the combustion gas discharge port of the exhaust pipe for a combustion device of the present invention are formed in different shapes, attachment to other members is easy.

According to a second aspect of the present invention, there is provided an exhaust pipe for a combustion apparatus which constitutes a part or the whole of a series of exhaust gas passages which communicate the combustion apparatus with the outside. It is deformed and has a combustion gas inlet for introducing combustion gas and a combustion gas outlet for discharging combustion gas to the outside.The combustion gas outlet is substantially circular, and the combustion gas inlet is vertically and horizontally long. Are different from each other.

The exhaust pipe for a combustion device of the present invention is also formed by deforming an integral pipe body as in the first aspect of the present invention, so that it has high airtightness and does not require a sealing material or the like. . Further, in the exhaust pipe for a combustion device of the present invention, the shape of the combustion gas outlet is substantially circular, so that it is not only easy to join with an external duct but also has low exhaust resistance. Further, the combustion gas inlets have different lengths and widths. That is, the combustion gas inlet is flat. Therefore, the internal space can be effectively used.

According to a third aspect of the present invention, there is provided an exhaust pipe for a combustion apparatus according to the first or second aspect, wherein the combustion gas outlet is located eccentrically with respect to the combustion gas inlet. is there.

In general, the size of a part constituting a combustion apparatus, excluding an exhaust pipe, is large in a portion where an object to be heated such as a heat exchanger is provided or in a portion where a flame is present, and when a blower or the like is provided. The part which was done is small. Therefore, in order to make the whole shape small, it is desirable that the exhaust pipe be disposed so as to cover these gaps. Here, the exhaust pipe for a combustion device of the present invention can be disposed by effectively utilizing the gap since the combustion gas outlet is located eccentrically with respect to the combustion gas inlet.

According to a fourth aspect of the present invention, the exhaust pipe for a combustion device has a bellows-shaped portion at an intermediate portion, and the bellows-shaped portion is bent so that the combustion gas outlet is eccentric with respect to the combustion gas inlet. The exhaust pipe for a combustion device according to claim 1, wherein the exhaust pipe is located at a position.

The exhaust pipe for a combustion apparatus according to the present invention is provided with a bellows-shaped portion at an intermediate portion, and the bellows-shaped portion is bent so that a combustion gas outlet is eccentric to a combustion gas inlet. Therefore, the flow path resistance is low without bending at an angle.

According to a fifth aspect of the present invention, there is provided a combustion section for passing a combustion gas downward to heat an object to be heated, an exhaust pipe arranged on a side of the combustion section, A combustion device provided with a connecting member at a lower portion for communicating a combustion portion with an exhaust pipe, wherein the exhaust pipe is an exhaust pipe for a combustion device having the structure according to any one of claims 1 to 4. Device.

The present invention relates to a combustion apparatus, and includes a combustion section for passing a combustion gas downward to heat an object to be heated, an exhaust pipe arranged on a side of the combustion section, and a combustion section. A connection member is provided at a lower portion and communicates with the combustion section and the exhaust pipe. The basic configuration of the combustion device of the present invention is of a type called a reverse combustion type, and is recommended because of its high thermal efficiency. The combustion apparatus according to the present invention employs the above-described exhaust pipe for a combustion apparatus in a back-combustion combustion apparatus, is easy to assemble, has low exhaust resistance, is efficient, and has a small external shape.

According to a sixth aspect of the present invention, there is provided a combustion apparatus comprising a flame hole or a nozzle for discharging fuel, discharging the fuel downward, burning the fuel, passing the combustion gas downward, and heating the object to be heated. Part, an exhaust pipe arranged on the side of the combustion part, and a connecting member below the combustion part and communicating the combustion part and the exhaust pipe, wherein the exhaust pipe is an integral pipe It has a combustion gas inlet for introducing combustion gas and a combustion gas outlet for discharging combustion gas to the outside, has a bellows-shaped part in the middle, and the bellows-shaped part is bent. The combustion gas outlet is located eccentrically with respect to the combustion gas inlet, the combustion gas outlet is substantially circular, the combustion gas inlet is different in length and width, and the bent portion of the bellows-shaped portion is It is characterized by being higher than the flame hole or nozzle A baked apparatus.

The present invention also relates to a reverse combustion type combustion device. As described above, the portion that is a member of the combustion apparatus and excludes the exhaust pipe has a large portion where a target to be heated such as a heat exchanger is provided and a portion where a flame exists, and a blower and the like are provided. The site is small. Further, since the present invention is a reverse combustion type combustion device, the flame passes downward and the lower member is large. Conversely, the portion above the flame hole or nozzle is small and has a relatively large gap. On the other hand, the exhaust pipe used in the combustion device of the present invention has a bellows-shaped portion in the middle portion, and the bellows-shaped portion is bent so that the combustion gas outlet is eccentric with respect to the combustion gas inlet. . The bent portion of the bellows-shaped portion is located higher than the flame hole or the nozzle. Therefore, in the combustion device of the present invention, a portion above the flame hole or the nozzle, which has a relatively large space, is bent, and the exhaust pipe is disposed so as to cover the gap. As a result, the combustion device of the present invention has a high internal component density and a small external shape. Further, the combustion device of the present invention is easy to assemble, has low exhaust resistance, and is efficient.

Further, the invention according to claim 7 is the combustion apparatus according to claim 5 or 6, wherein a heat insulating material is provided between the combustion section and the exhaust pipe.

In the combustion apparatus of the present invention, since the heat insulating material is provided between the combustion section and the exhaust pipe, the heat of the combustion section does not escape to the exhaust pipe.

The invention according to claim 8 has a case that covers the whole, and the exhaust gas outlet of the exhaust pipe is substantially circular and protrudes from the case. A combustion device according to any one of the above.

The present invention proposes a practical structure of a combustion apparatus, in which a combustion gas outlet of an exhaust pipe is substantially circular and protrudes from the case. Therefore, an external exhaust duct can be easily connected.

[0024]

Embodiments of the present invention will be described below. FIG. 1 is a front view showing a water heater according to an embodiment of the present invention, with a front panel removed.
FIG. 2 is a front view, a left and right side view, and a bottom view of an exhaust pipe for a combustion device according to an embodiment of the present invention. FIG. 3 is a front view, a side view, and a bottom view of an exhaust pipe flange used in the water heater according to the embodiment of the present invention. FIG. 4 is a front view and left and right side views in a state where an exhaust pipe flange is connected to the exhaust pipe for the combustion apparatus. FIG. 5 is an exploded perspective view of the exhaust pipe for a combustion apparatus according to the embodiment of the present invention and the vicinity thereof.

The water heater 1 of the present embodiment has a main body case 2 as in the prior art, in which a blower 3, a combustion section 5, an exhaust pipe 6, and an exhaust manifold (connecting member) 7 are incorporated. It is a thing. The main body case 2 contains these pipes and the controller unit 18.
The controller unit section 18 is a section in which electric devices for controlling the combustion section 5 and the blower 3 are stored. To explain sequentially, the main body case 2 is, as shown in FIG.
0, 11, a top cover 12, a bottom plate 13, and a back panel (not shown).

The combustion section 5 is largely constituted by a burner section 16 and a combustion case section 17. That is, the burner section 16 has the vaporization chamber 15 for vaporizing liquid fuel such as kerosene, and further includes the flame hole base 14 in which the flame holes are distributed in a plane. Then, a flame is generated downward from the flame hole base 14. The blower 3 is integrated with the top side of the burner section 16.

On the other hand, a combustion case 17 is attached to the lower surface of the burner 16. The combustion case 17 is
It is a quadrangular prism box made of stainless steel etc.
Two systems of heat exchangers 20 and 21 are built therein.

A general view of the blower 3 and the combustion section 5 shows that the blower 3 and the combustion section 5 are integral and have a rectangular column shape.
Is smaller in width than the combustion part 5. Therefore, in the main body case 2, the distance between the combustion part 5 and the left side plate 10 is small, and the distance between the blower 3 and the right side plate 11 is larger than that.

At the lower end of the combustion case portion 17, an exhaust collecting tube (connecting member) 7 is provided, and the exhaust collecting tube 7 is connected to the exhaust pipe 6.

Here, the exhaust pipe 6 is the most characteristic component of the water heater of the present embodiment, and will be described in detail. The exhaust pipe 6 is made of a non-rusting metal such as stainless steel as a material, and is formed by deforming the metal pipe by applying an external force. That is, the exhaust pipe 6 is formed by winding a metal plate such as stainless steel in a circular shape.
A line 30 shown in FIG. 3 is a joining surface of the metal plate. The joining of the metal plates is performed by known welding or the like.

The shape of the exhaust pipe 6 is as shown in FIGS. 2, 4, and 5. A combustion gas inlet 31 for introducing combustion gas is opened at the lower part, and a combustion gas outlet 32 for discharging the combustion gas to the outside at the upper part. Is open. Further, a bellows part 33 is provided in the middle part. The length of the bellows portion 33 is 20 to 3 of the total length of the exhaust pipe 6.
It is about 0%. The position of the bellows part 33 is the exhaust top 36
It is a portion below the exposed portion from the case main body 2 which is referred to as a case.

The shapes of the combustion gas inlet 31 and the combustion gas outlet 32 differ greatly. That is, the upper combustion gas outlet 32 is circular. On the other hand, the lower combustion gas inlet 31 has a long hole shape. That is, the lower combustion gas inlet 31 is flat, and the vertical and horizontal lengths are different by about two to three times.

The change in the cross-sectional shape of the exhaust pipe 6 in the height direction is a circular shape from the upper end of the combustion gas outlet 32 to the lower end of the bellows portion 33, and from the lower end of the bellows portion 33 to the combustion gas inlet 31. The gap gradually becomes flatter. The exhaust pipe 6 of the present embodiment is manufactured by deforming a cylindrical body having a uniform thickness, and has the same circumference at any position except for the bellows 33.

The exhaust pipe 6 is eccentric as shown in FIG.
The combustion gas outlet 32 is located eccentrically with respect to the combustion gas inlet 31. That is, the center of the combustion gas outlet 32 and the center of the combustion gas inlet 31 are shifted. The amount of eccentricity of both is about 20 mm to 50 mm, and is shifted in the short axis direction of the combustion gas inlet 31. The bent portion of the exhaust pipe 6 is concentrated on the bellows portion 33, and the bellows portion 33 is bent in an “S” shape to secure a predetermined eccentric amount.

The bellows portion 33 has an annular bulge 35 on its outer periphery.
Are formed at equal intervals, and in the present embodiment, the shape of the protrusion 35 is semicircular. However, the shape and spacing of the ridges are arbitrary. In the present embodiment, the bellows portion 33 is considerably hard and does not easily deform. Since the exhaust pipe 6 is formed by processing a cylindrical pipe as described above, it is lighter than the conventional one. The exhaust pipe 6 is formed by processing a cylindrical pipe, and airtightness is ensured at the stage when the exhaust pipe 6 is formed into a pipe shape. Therefore, the exhaust pipe 6 has high reliability for airtightness.

The exhaust pipe 6 is attached to the exhaust manifold 7 via an exhaust pipe flange 40 as shown in FIG. The exhaust pipe flange 40 includes a bowl-shaped portion 41 having a rectangular shape in plan view.
And a flange 43 is provided at the lower opening end. An opening 45 is provided at the center of the bowl-shaped portion 41, and an end of the opening 45 is raised. Then, the opening end of the combustion gas inlet 31 is aligned with the rising portion 46 of the exhaust pipe flange 40, and a screw 47 as shown in FIG.
Are joined by

The exhaust pipe 6 is disposed adjacent to the left side of the combustion section 5. Since the controller unit 18 is disposed on the right side of the combustion section 5, there is no room for providing the exhaust pipe 6 on the right side of the combustion section 5. A plate wall 51 made of stainless steel is provided between the exhaust pipe 6 and the combustion section 5 as shown in FIG. The whole shape of the plate wall 51 is concave so as to follow the side shape of the exhaust pipe 6. A heat insulating material 52 such as glass wool is provided between the plate wall 51 and the combustion section 5. The heat insulating material 52 is provided to prevent the heat of the combustion section 5 from escaping to the exhaust pipe 6 side, and is provided to improve the thermal efficiency and prevent the exhaust pipe 6 from being deformed.

The bellows portion 33 is located at the boundary between the combustion portion 5 and the blower 3 as shown in FIG. That is, the bent portion is located at the boundary between the combustion portion 5 and the blower 3, the upper portion of the exhaust pipe 6 is displaced in the horizontal direction and is closer to the center, and the portion of the exhaust top 36 at the tip is located above the case body 2. It is exposed to. The exhaust top 36 is connected to the exhaust duct 50.

The height relationship between the bellows portion 33 or the bent portion and the combustion portion 5 is not generally determined, but generally agrees with a height higher than the position of the flame hole.
In the case of a combustion section having a nozzle as described in the section of the related art, the bellows section 33 should be provided at a position higher than the position of the nozzle.

As described above, the blower 3 and the combustion part 5 are integral, but the part of the blower 3 is smaller in width than the combustion part 5, and in the main body case 2, the combustion part 5 and the left side plate 10 Is small, and the space between the blower 3 and the right side plate 11 is larger than that. On the other hand, the exhaust pipe 6 employed in the present embodiment has a flat lower portion attached to the exhaust collecting tube 7, and has a round cross-sectional shape on the side surface of the blower 3 having a sufficient space. Therefore, it can be effectively installed in a narrow space below the exhaust pipe 6. On the other hand, on the upper side, the cross-sectional shape is circular, the cross-sectional area is large, and the flow resistance is small. That is, in the back-combustion type combustion apparatus, the exhaust pipe 6 should have a horizontally long shape at the lower portion due to layout, while the upper portion should have a circular shape to reduce the exhaust resistance. It can be said that the water heater (combustion device) of the present embodiment satisfies these two requirements.

The exhaust pipe 6 employed in this embodiment has a small cross-sectional shape, so that the flow path resistance is small,
The load on the blower is small. Therefore, the noise of the water heater (combustion device) is low.

[0042]

As described above, the exhaust pipe for a combustion apparatus according to the first and second aspects is formed by deforming an integral pipe, so that the airtightness is high and the safety is excellent. In addition, no sealing material or the like is required, and the production is simple. Claim 1
In the exhaust pipe for a combustion device described in (1), since the combustion gas inlet and the combustion gas outlet are formed in different shapes, it is easy to attach to other members.

In addition, the exhaust pipe for a combustion device according to the second aspect has an effect that not only is it easy to join with an external duct because the shape of the combustion gas outlet is substantially circular, but also the exhaust resistance is low. is there. Furthermore, in the exhaust pipe for a combustion device according to the second aspect, the combustion gas inlet is flat. Therefore, there is an effect that the internal space can be effectively used.

In the exhaust pipe for a combustion device according to the third aspect of the present invention, since the combustion gas discharge port is located eccentrically with respect to the combustion gas introduction port, an effect can be obtained by effectively utilizing the gap. There is.

In the exhaust pipe for a combustion device according to the fourth aspect, a bellows portion is provided at an intermediate portion, and the bellows-shaped portion is bent so that the combustion gas outlet is eccentric to the combustion gas inlet. . Therefore, there is an effect that the flow path resistance is low without the bent portion being bent at an angle.

Further, the combustion apparatus according to the fifth aspect utilizes the excellent performance of the inventions according to the first to fourth aspects, is easy to assemble, has low exhaust resistance and is efficient. In addition, there is an effect that the external shape is small.

In addition, there is an effect that the internal component density according to claim 6 is high and the external shape can be reduced. In addition, the combustion device of the present invention is easy to assemble, has low exhaust resistance, and is efficient.

Further, in the combustion apparatus according to the present invention, since the heat insulating material is provided between the combustion section and the exhaust pipe, the heat of the combustion section does not escape to the exhaust pipe.

Further, there is an effect that the exhaust duct outside the combustion device according to the eighth aspect can be easily connected.

[Brief description of the drawings]

FIG. 1 is a front view showing a water heater according to an embodiment of the present invention, with a front panel removed.

FIG. 2 is a front view, a left and right side view, and a bottom view of an exhaust pipe for a combustion device according to an embodiment of the present invention.

FIG. 3 is a front view, a side view, and a bottom view of an exhaust pipe flange used in the water heater according to the embodiment of the present invention.

FIG. 4 is a front view and left and right side views in a state where an exhaust pipe flange is connected to an exhaust pipe for a combustion device.

FIG. 5 is an exploded perspective view of an exhaust pipe for a combustion device according to the embodiment of the present invention and the vicinity thereof.

FIG. 6 is a front view showing a conventional combustion device.

FIG. 7 is a perspective view of a conventional exhaust pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot-water supply device 2 Main body case 3 Blower 5 Burning part 6 Exhaust pipe 7 Exhaust collecting tube (connecting member) 16 Burner part 17 Burning case part 31 Burning gas inlet 32 Burning gas outlet 33 Bellows part 36 Exhaust top 52 Heat insulating material

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroaki Tanaka 93 Edocho, Chuo-ku, Kobe City, Hyogo Prefecture Inside Noritz Co., Ltd.

Claims (8)

[Claims] 1. An exhaust pipe for a combustion device, which constitutes a part or the whole of a series of exhaust gas passages communicating the combustion device with the outside, wherein the combustion gas is formed by deforming an integral pipe. A combustion gas inlet for introducing a fuel gas and a combustion gas outlet for discharging the combustion gas to the outside, wherein the combustion gas inlet and the combustion gas outlet are formed in different shapes. tube. 2. An exhaust pipe for a combustion device, which constitutes a part or the whole of a series of exhaust gas passages that communicate the combustion device with the outside, wherein the combustion gas is formed by deforming an integral pipe. A combustion gas inlet and a combustion gas outlet for discharging the combustion gas to the outside, the combustion gas outlet is substantially circular,
An exhaust pipe for a combustion device, wherein the combustion gas inlets have different lengths and widths. 3. The exhaust pipe for a combustion device according to claim 1, wherein the combustion gas outlet is located eccentrically with respect to the combustion gas inlet. 4. A bellows-shaped part in an intermediate portion, wherein the bellows-shaped part is bent and a combustion gas outlet is located at a position eccentric to a combustion gas inlet. 3. The exhaust pipe for a combustion device according to any one of 3. 5. A combustion section for passing a combustion gas downward to heat an object to be heated, an exhaust pipe arranged on a side of the combustion section, and a combustion section and an exhaust gas provided below the combustion section. 5. A combustion apparatus comprising a connecting member for communicating a pipe, wherein the exhaust pipe is a combustion apparatus exhaust pipe having a structure according to any one of claims 1 to 4. 6. A flame or nozzle for discharging fuel,
A combustion section that discharges fuel downward, burns, passes combustion gas downward, and heats an object to be heated, an exhaust pipe arranged on a side of the combustion section, and a lower section of the combustion section. In a combustion device provided with a connecting member that communicates a combustion part and an exhaust pipe, the exhaust pipe is configured by deforming an integral pipe body,
It has a combustion gas inlet for introducing combustion gas and a combustion gas outlet for discharging combustion gas to the outside.It has a bellows-shaped part in the middle, and the bellows-shaped part is bent to burn the combustion gas outlet. It is located at an eccentric position with respect to the gas inlet, the combustion gas outlet is substantially circular, the combustion gas inlet is different in length and width, and the bent portion of the bellows-shaped portion is higher than the flame hole or the nozzle. A combustion device characterized by being in a position. 7. The combustion apparatus according to claim 5, wherein a heat insulating material is provided between the combustion section and the exhaust pipe. 8. The combustion apparatus according to claim 5, further comprising a case covering the whole, wherein a combustion gas outlet of an exhaust pipe is substantially circular and protrudes from the case. .