JP2802414B2 - Gas 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 gas combustion device,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas combustion apparatus of a type in which a ceramic plate is used as a flame hole surface to form a large number of flame holes.

[0002]

2. Description of the Related Art As shown in FIG. 5, a gas burner (3) and a heat exchanger heated by the gas burner are shown in FIG. 5 as a gas combustion device which improves the thermal efficiency by absorbing latent heat in combustion exhaust gas. There is a combination of (1). The heat exchanger (1) is configured by bending a water pipe (11) having a number of fins (12) (12) on the outer periphery in a meandering manner,
These are housed in a can (6). The heat exchanger (1) is disposed downstream of the main heat exchange section (1a), which mainly absorbs the sensible heat of the combustion exhaust gas of the gas burner (3), and the exhaust gas flow below the main heat exchange section (1a). It mainly comprises a sub heat exchange section (1b) that absorbs heat.

The gas burner (3) has a large number of flame holes (310).
(310) and a mixing chamber (32) above the ceramic plate (31) .The mixing chamber (32) has a gas nozzle (3).
3) is facing. The gas burner (3) is arranged such that the flame holes (310) and (310) of the ceramic plate (31) are set downward, and the main heat exchange section (1a) is located near the flame forming area. It is arranged. In addition, the gas burner (3)
The combustion air and gas are forcibly pushed into the mixing chamber (32) by the fan (4) and supplied.
As a result, the combustion exhaust gas from the gas burner (3) is
Through the exhaust passage (21) below it and further through the exhaust port (2)
From the outside.

In this device, a fan (4) is operated to
The primary air is supplied to the mixing chamber (32) and the gas nozzle (3
When the gas is supplied from the gas burner (3) to the mixing chamber (32) to burn the gas burner (3), the combustion exhaust gas generated by the gas burner (3) is supplied to the main heat exchange section (1a) of the heat exchanger (1). → Sub heat exchange section (1b) →
The gas flows through the exhaust passage (21) and is discharged to the outside through the exhaust port (2). In this state, the water pipe (1) located on the side of the sub heat exchange section (1b)
When tap water is supplied from 1), the tap water supplied to the water pipe (11) absorbs heat generated by the gas burner (3) from the water pipe (11) and the fins (12) and (12), and And the main heat exchange section (1a)
The main heat exchange section (1a) mainly absorbs the sensible heat of the combustion exhaust gas from the gas burner (3), and the sub heat exchange section (1b)
Then, the sensible heat is taken away and the cooled combustion exhaust gas contacts the water pipe (11) and the fins (12) (12) located in the sub heat exchange part (1b) having a dew point temperature or lower to drain the water. The latent heat generated at that time is absorbed by the water flowing in the water pipe (11).

[0005] However, this gas combustion device has a problem that when the ceramic plate (31) is damaged, maintenance is difficult. In this case, a gas burner (3) is arranged above the heat exchanger (1) to prevent the adhesion of drain. On the other hand, the gas burner (3) has a ceramic plate (31). However, although the ceramic is excellent in hardness and the like, it has the property of being brittle and easily broken as compared with stainless steel or the like. Therefore, when the heating of the ceramic plate (31) in the use state of the apparatus and the cooling of the ceramic plate (31) when the apparatus is not used are repeated, the ceramic plate (31) is easily broken, and When the ceramic plate (31) breaks and its fragments fall downward, the fragments are scattered around. Thus, when the ceramic plate (31) is replaced or the like, it takes time and effort to collect the debris, and the maintenance of the device becomes difficult.

As shown in FIG. 6, a gas burner (3) is set horizontally, and a main heat exchange section (1a) is provided near a flame forming area.
However, the same disadvantage as described above occurs even in the case where the type is located. The present invention provides a ceramic plate (31) in which a heat exchanger (1) is provided in an exhaust path from a gas burner (3) of a ceramic plate type and a large number of flame holes are drilled.
In the gas combustion device in which the outer surface facing the flame formation area side is directed downward from the lateral direction, the problem is to facilitate maintenance when the ceramic plate (31) is damaged. I do.

[0007]

Technical Means The technical means of the present invention taken to solve the above-mentioned problem is that a net formed of a heat-resistant material is attached to the entire outer surface of the ceramic plate (31), and the net is attached to the above-mentioned net. It is fixed to a fixed portion such as the ceramic plate (31) itself or a burner body ”.

[0008]

The above technical means of the present invention operates as follows. When the gas burner (3) is burned, combustion exhaust gas is generated and the heat exchanger (1) is heated. On the other hand, since the mesh formed of a heat-resistant material is attached to the entire outer surface of the ceramic plate (31) on the flame forming area side, even if the ceramic plate (31) is broken, The debris is held by the mesh and is hardly scattered around.

[0009]

According to the present invention having the above-described configuration, the present invention has the following specific effects. Even if the ceramic plate (31) breaks, the fragments are hardly scattered to the surroundings. Easier to remove.

Further, even when the ceramic plate (31) is cracked, the fragments do not fall downward and tend to be maintained in a normal state before the ceramic plate (31) cracks. The service life of (31) is extended.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. The embodiment shown in FIG. 1 is an embodiment in which the present invention is applied to a water heater provided with a heat exchanger (1) having a function of condensing combustion exhaust gas and absorbing the latent heat. In this device, a can body (6) containing a heat exchanger (1) is provided at the bottom of the water heater body,
A combustion chamber provided with a gas burner (3) of the ceramic plate (31) type above the can body (6) and an air supply chamber (42) above.
(7) is provided. A fan (4) is provided above the air supply chamber (42). Further, an exhaust passage (21) connected to the lower end opening of the can body (6) is provided so as to run up and down the water heater main body.

The heat exchanger (1) mainly includes a gas burner (3)
A main heat exchange section (1a) that absorbs the sensible heat of the combustion exhaust gas, and a gas
And (3) a sub heat exchange section (1b) that absorbs the latent heat of the combustion exhaust, and one main heat exchange section (1a) has an annular fin.
(12) Consisting of a water pipe (11) provided with (12), the other sub heat exchange section (1b) has an annular fin at an upstream portion of the main heat exchange section (1a) in the water pipe (11). (12) A configuration provided with (12). And in this embodiment, the main heat exchange section (1a)
Has a single-stage configuration in which three stages are formed and each stage is bent in a meandering manner in two rows or three rows.
In addition, the water pipe (11) on the side of the sub heat exchange section (1b) (the water pipe (1
1)) to supply tap water to the main heat exchange section (1a)
1) The hot water is taken out from the top water pipe (11). Further, the drain generated in the sub heat exchange section (1b) is discharged to the outside from a drain outlet (8) below the can body (6).

The gas burner (3) has a large number of flame holes (310) (31).
0) and a mixing chamber (32) above the ceramic plate (31). A gas nozzle (33) faces the mixing chamber (32). As shown in FIGS. 2 and 3, a wire mesh (5) is stretched on the ceramic plate (31) in such a manner that the wire mesh (5) is brought into close contact with the outer surface and does not block the flame holes (310) and (310). doing. In this embodiment, the mixing chamber (3
Hooks (F) and (F) are provided on the side wall of (2), and the wire mesh (5) is engaged with the hooks (F) and (F) to stretch the wire mesh (5) on the ceramic plate (31). I have.

The exhaust passage (21) is provided in the can body of the water heater.
It is drawn out from the lower end opening of (6), and the exhaust port (2) at its downstream end opens to the upper part of the water heater. Therefore, by operating the fan (4), forced air is supplied to the mixing chamber (32) and gas is supplied from the gas nozzle (33) to the gas burner.
(3) is burned, and in this state, when tap water is supplied from the bottom water pipe (11), the combustion exhaust gas generated by the gas burner (3) is converted into a heat exchanger ( The heat flows through the main heat exchange section (1a) → sub heat exchange section (1b) → exhaust passage (21) of (1) and is discharged to the outside through the exhaust port (2). Then, the main heat exchange section (1a)
And the sub-heat exchange section (1b) through the water pipe (11)
The heat generated in (3) is absorbed through the water pipe (11) and the fins (12) and (12), and is taken out of the uppermost water pipe (11) as hot water. In the heat absorbing action at this time, the action of absorbing the sensible heat of the combustion exhaust gas of the gas burner (3) mainly depends on the main heat exchange section (1).
In the sub heat exchange section (1b), the action of mainly condensing the combustion exhaust gas of the gas burner (3) and absorbing the latent heat is performed. That is, in the sub-heat exchange section (1b), the combustion exhaust gas whose sensible heat has been taken away and cooled is passed through the water pipe (11) and the fins (12) (12) ( Drain is generated by contact with the water passage (12), and the latent heat at that time is absorbed by the water flow in the water flow pipe (11). At this time, even if the ceramic plate (31) is broken, a wire mesh (5) is stretched over the ceramic plate (31), and pieces of the ceramic plate (31) do not scatter around. In addition, the work of collecting debris during the repair work of the ceramic plate (31) is facilitated, which facilitates the maintenance of the water heater. Also, the wire mesh
In (5), since the ceramic plate (31) tends to be maintained in a normal state before the ceramic plate (31) is broken, the ceramic plate (31) also has a life extension effect. Further, the wire mesh (5) is a ceramic plate (31).
Since the flame holes (310) and (310) are provided so as not to be blocked, proper combustion of the gas burner (3) is ensured.

The above embodiment can be modified as follows. . As shown in FIG. 4, grooves (315) are formed on the outer surface of the ceramic plate (31) so as not to interfere with the flame holes (310) (310).
(315), and a wire mesh in a mode of fitting into the concave grooves (315) and (315).
(5) may be installed. In this case, since the disposition position of the wire mesh (5) does not shift, the workability when assembling the wire mesh (5) is improved. Also, since the wire mesh (5) does not protrude from the flame forming surface of the ceramic plate (31), proper combustion of the gas burner (3) is ensured.

In the above embodiment, the wire mesh (5) is engaged with the hooks (F) (F) provided on the side wall of the mixing chamber (32). The metal mesh (5) may be bent into a U-shape and engaged with the outer peripheral edge of the ceramic plate (31), or the wire mesh (5) may be locked to a fixed portion such as the side wall of the can body (6). Good. Further, in any of the above cases, the wire mesh
Instead of (5), it is possible to adopt a net-shaped heat-resistant material such as a heat-resistant resin.

[0017] In the above embodiment, the water pipe (11) is bent in a meandering shape to form a four-stage configuration, in which the lowermost stage is the sub heat exchange unit (1b) and the other three stages are the main heat exchange unit. (1a), but depending on the sensible heat absorption capacity of the main heat exchange part (1a), the water pipe (11) part of the sub heat exchange part (1b) that absorbs latent heat, There are multiple stages. Thus, the sub heat exchange section (1
When b) is composed of a plurality of stages, water may be supplied from the water pipes (11) at the second or third stage from the bottom. Also, including the case of the above embodiment, the hot water may be taken out from the second or third stage from the top.

[0018] In the above embodiment, the fan (4) is provided on the side of the air supply passage, but may be provided on the side of the exhaust passage (21). . In the above embodiment, the present invention is applied to a water heater as a gas combustion device, but the present invention is also applied to a gas combustion device such as a heater that circulates heated water in addition to the water heater. Is possible.

[0019] The present invention is a main heat exchange section (1a) as well as a gas combustion apparatus of a type that mainly absorbs sensible heat in the main heat exchange section (1a) and mainly absorbs latent heat in the sub heat exchange section (1b).
It is also applicable to a type in which only the sensible heat is absorbed and the latent heat is mainly absorbed in the sub heat exchange section (1b). In any of the above cases, the heat exchanger included in the gas combustion device may be of a type having only a function of absorbing sensible heat in combustion exhaust gas.
Needless to say, the gas burner (3) of the gas combustion device may be of a type in which the flame holes are set to be directed sideways or obliquely downward.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

[Fig. 2] Enlarged view of gas burner (3)

FIG. 3 is a view as viewed from an arrow A.

FIG. 4 is an explanatory view showing a state where grooves (315) and (315) are formed in a ceramic plate (31), and a wire mesh (5) is fitted into the grooves (315) and (315).

FIG. 5 is an explanatory view of a conventional example.

FIG. 6 is an explanatory view of another conventional example.

[Explanation of symbols]

 (1) ・ ・ ・ Heat exchanger (3) ・ ・ ・ Gas burner (31) ・ ・ ・ Ceramic plate

Claims (3)

(57) [Claims] A gas burner of a ceramic plate type (3)
A heat exchanger (1) is provided in the exhaust path from the ceramic plate (31), and the outer surface of the ceramic plate (31) in which a number of flame holes are formed is set so that the outer surface facing the flame formation region faces the range from the lateral direction to the downward direction. In a gas combustion apparatus, a mesh formed of a heat-resistant material is attached to the entire outer surface of a ceramic plate (31), and the mesh is fixed to the ceramic plate (31) itself or to a fixed portion such as a burner body. Combustion equipment. 2. The gas combustion apparatus according to claim 1, wherein the mesh body is disposed such that a wire of the mesh body runs between the flame holes of the ceramic plate. 3. The ceramic plate (31) according to claim 2, wherein a concave groove is formed on the outer surface of the ceramic plate (31) on the side of the flame formation area, and a wire forming a net is inserted into the concave groove. A gas combustion device as described.