JP2646064B2 - Water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater, and more particularly to a water heater of a type in which combustion exhaust gas is passed downward through a heat exchanger. When the water heater of the above type is installed instead of the water heater, the existing exhaust pipe structure formed on the building side can be used as it is, so that the replacement operation can be easily performed.

[0002]

2. Description of the Related Art There is a water heater having a structure as shown in FIG. 3 which utilizes the latent heat of combustion exhaust to improve the heat exchange efficiency (Japanese Patent Application Laid-Open No. 58-168839). In this one, a gas burner
A heat exchanger (1) is located below (3),
An exhaust manifold (89) is connected to the lower end of the can (6) constituting the outer peripheral wall of the heat exchanger (1), and is connected to the exhaust manifold (89).
In the lower part of the heat exchanger (1), a funnel-shaped drain receiver (80) is formed. Also, the exhaust collecting cylinder (89)
An exhaust connection cylinder (213) is protruded from the side wall. The heat exchanger (1) is connected to the main heat exchange section (1
a) and the sub heat exchange section (1b) located below, it is composed of upper and lower stages, and tap water is supplied from the sub heat exchanger (1b) to the main heat exchange section (1a).
It flows to the side.

In this apparatus, when a gas burner (3) is forcibly burned using a fan (4) and tap water is supplied from a sub heat exchanger (1b) side, the combustion exhaust gas generated by the gas burner (3) is exhausted. The main heat exchange section (1a) on the upper stage side is heated by the sensible heat. Then, the combustion exhaust gas whose temperature has been lowered after heating the heat exchange section (1a) is turned into a sub heat exchange section (1b) through which low-temperature water flows.
When passing through, it is cooled below the dew point,
Drain is generated. Then, the latent heat generated at this time is absorbed by the sub heat exchange unit (1b) and the sub heat exchange unit (1b)
The temperature of the part of the water flow is raised. In this way, the above-mentioned device aims to improve the heat exchange efficiency by actively utilizing the latent heat. The drain generated when the combustion exhaust gas passes through the sub heat exchange section (1b) is discharged to the outside through the discharge hole (81) of the drain receiver (80) located below.

However, in the above-mentioned conventional apparatus, when the existing hot water heater of the type that does not actively use latent heat is to be replaced, it is indispensable to construct the existing exhaust pipe structure formed on the building side. As a result, there is a problem that the work is troublesome. In the type of water heater that does not actively use latent heat, a heat exchanger is provided above the gas burner, and an exhaust connection tube (213) is further provided above the gas burner. In general, it is configured to pass through. Therefore, the upstream end of the building-side exhaust pipe (S) formed at the location where such a type of water heater is installed,
It is located at a position corresponding to the upper side of the water heater. However, in the above-mentioned conventional type that actively utilizes latent heat, the exhaust connection tube (F) projects to the lower side,
Special work is required to connect the exhaust connection pipe (F) and the upstream end of the exhaust pipe (S) formed on the building side with a separately prepared connection pipe (T), which makes replacement work troublesome. This is the case.

[0005] The present invention has been made in view of the above-mentioned point, and is described as follows. "A heat exchanger (1) comprising a main heat exchange section and a sub heat exchange section is provided below a gas burner (3). A drain receiver (80) is disposed below the lower end opening of the heat exchanger (1), and the gas burner (3) is further operated by a fan (4).
In the water heater that forcibly burns and forcibly exhausts, the existing exhaust pipe structure etc. formed on the building side can be used as it is, so that the latent heat is not actively used. It is an object of the present invention to make it possible to easily perform a replacement operation with a hot water heater (a water heater of a type in which combustion exhaust gas passes upward in a heat exchanger) and to reduce the overall thickness of the replaced water heater.

[0006]

The technical means of the present invention for solving the above-mentioned problems is as follows: "The heat exchanger (1) is constituted by arranging the main heat exchange part and the sub heat exchange part vertically one after another, The water pipe (11) penetrating the heat exchanger (1) runs in the lateral direction of the appliance, rises from the lower end opening of the heat exchanger (1), and connects to the exhaust connection tube (213) at the upper end of the appliance. The exhaust passage (21) is run adjacent to the outer wall of the heat exchanger (1), and the width of the exhaust passage (21) is set substantially equal to the width of the heat exchanger (1). The front and rear thicknesses have been flattened. "

[0007]

The above technical means operates as follows. A main heat exchange part and a sub heat exchange part are vertically arranged continuously from the lower end opening of the heat exchanger (1) to the front or rear side (the front or rear side in the front-rear direction of the appliance). Rises in a manner adjacent to the outer wall of the heat exchanger (1).
1) is formed, and the downstream end of the exhaust passage (21) is connected to the exhaust connection tube (213) at the upper end of the device. Therefore, when the water heater according to the present invention is installed as a water heater that does not actively use latent heat in place of a general top exhaust type appliance, the exhaust connection tube (213) located at the upper end of the appliance and the appliance upper end What is necessary is just to connect simply the end part of the exhaust pipe (S) on the building side formed so as to correspond to the part. in this way,
According to the above technical means, there is no need to perform a special construction for connecting the existing exhaust pipe formed on the building side to the appliance body with a separately prepared connecting cylinder or the like.

[0008]

The present invention has the following specific effects. The equipment can be replaced without any special work to connect the equipment body and the exhaust pipe on the building side with a separately prepared connecting tube etc.
Even when replacing with an existing water heater of a type that does not actively use latent heat (a type in which combustion exhaust gas passes upward in the heat exchanger), the operation can be easily performed.

The width of the exhaust passage (21) is increased until the width of the exhaust passage (21) becomes substantially equal to the width of the heat exchanger (1).
1) heat exchanger (1) from the lower end opening of heat exchanger (1)
Since the exhaust passage (21) can be made flat by running in a manner adjacent to the outer wall of the device, the overall thickness of the device can be reduced. Therefore, the amount of protrusion from the mounting wall surface is small and the device is compact.

[0010]

Next, an embodiment of the present invention will be described.
The embodiment shown in FIG. A can body that constitutes a heat exchanger (1) at the bottom of the water heater body of the F (forced air supply and exhaust) water heater
(6) and a gas burner above the can body (6).
(3) A gas supply box (7) provided with an air supply chamber (42) above the gas burner (3) (which is disposed long in the front-rear direction with respect to the paper surface in FIG. 1). Are arranged.
A fan (4) is provided above the air supply box (7), and an exhaust passage (2) is provided downstream of the gas burner (3).
1) is provided so as to run up and down.

As shown in FIGS. 1 and 2, the exhaust passage (21) has an exhaust guide plate (210), side plates (211) (211) formed by bending both sides thereof, and a heat exchanger (6). A rear wall (61) and an extension plate (63) connected to the rear wall (61). The exhaust guide plate (210) is disposed so as to face a region along the rear wall (61) of the heat exchanger (6) from the lower end opening of the heat exchanger (1). The exhaust guide plate (210) extends to the exhaust connection tube (213) at the upper end of the instrument body.
Side plates (211) (211) formed by bending both sides of the exhaust guide plate (210) toward the heat exchanger (1) are welded and fixed to the can body (6) of the heat exchanger (1). As a result, the exhaust guide plate (210) and the side plates (211) (211) on both sides thereof and the can body (6)
The exhaust passageway (2) surrounded by the rear wall (61) and its extension plate (63)
1) is formed. And in this case, the exhaust passage (21)
The rear wall (61) of the can body (6) is used as a part of the constituent wall, and the exhaust passage (21) and the lateral width of the can body (6) are configured to be substantially the same. Therefore, the exhaust passage (2
1) can be formed up and down adjacent to the can body (6) without reducing the passage area, and the instrument body can be thinned. The downstream end of the exhaust passage (21) is connected to the exhaust connection tube (213) at the upper end of the device, and the most upstream end of the air supply passage (49) is connected to the air supply connection tube (214) surrounding the exhaust tube (213). ). Therefore, when installing the water heater of this embodiment as a water heater that does not actively use latent heat in place of a general top exhaust type appliance, the exhaust connection tube (213) and the air supply connection tube (214) ) May simply be connected to the ends of the exhaust pipe (S) and the air supply pipe (Y) on the building side corresponding to the upper end of the fixture. In FIG. 1, (K) is a casing.
(K1) is a front cover that covers the front opening (K3).

Further, a portion of the exhaust guide plate (210) facing the lower end opening (10) of the heat exchanger (1) is entirely depressed in a funnel shape to form a drain receiver (80). A drain outlet (81) is provided at the bottom of the drain receiver (80). The said heat exchanger (1) is comprised so that the main heat exchange part and the sub heat exchange part may be arrange | positioned continuously up and down, and these are comprised of many fins (1).
2) Consisting of (12), a water pipe (11) penetrating therethrough, and a can (6) for accommodating them, and the bottom of the can (6) is open as described above. In this embodiment, one water pipe (11) is penetrated through the can body (6) in a meandering state, so that the water pipe (11) becomes 4
It has a step configuration. Each stage has a horizontal two-row or three-row configuration, and the lowermost water pipe (11)
And tap water is supplied from the pipe to take out hot water from the upper water pipe (11). Further, a guide plate (15) opposed to each water pipe (11) at an interval is provided below each step of the water pipe (11), and the guide plate (15) is Curved downward and in its center an opening (16)
Are drilled. As a result, the combustion exhaust gas generated by the gas burner (3) and flowing downward passes through the opening (16) so that the combustion exhaust gas is efficiently applied to the entire peripheral surfaces of the water pipe (11) and the fins (12). Contact, increasing heat absorption efficiency. Water pipes (11) (11) and fins (12)
The drain generated in (12) passes through the opening (16) of the guide plate (15) and is discharged to the outside from the drain discharge hole (81) below the can body (6).

The gas burner (3) is of an all-primary air combustion type, and comprises a burner mixing pipe (32) and a plurality of gas nozzles (31) facing the burner mixing pipe (32). The primary air is pushed and supplied by the fan (4). In this apparatus, the fan (4) and the gas burner (3) are provided in order to uniformly supply the primary air to the plurality of gas burners (3).
And a dispersing plate (45) is interposed therebetween.

The fan (4) is operated to supply primary air to the mixing pipe (32), and the gas nozzles (31) and (31) are used to supply the primary air to the mixing pipe (3).
When gas is supplied to 2) to burn the gas burner (3) and tap water is supplied from the lower part of the water pipe (11) in this state, the water pipe (1)
The water flow in 1) is based on the heat generated by the gas burner (3).
(12) It is absorbed from (12) and the like, and is taken out from the upper part of the water pipe (11) as hot water. In this endothermic action,
The function of absorbing the sensible heat of the combustion exhaust gas of the gas burner (3) is mainly performed in the upper water passage (11), and the lower water passage (11) is mainly used for the gas burner (3). The action of condensing the combustion exhaust and absorbing the latent heat is performed. That is, in the lower water pipe (11), a drain is generated mainly by further cooling the combustion exhaust gas whose sensible heat has been taken away and cooled to a temperature lower than its dew point temperature, and the latent heat water pipe at that time is generated.
(11) It is absorbed in the water inside. Then, the combustion exhaust gas after passing through the gas burner (3) passes through the exhaust passage (21) and is discharged from the exhaust connection pipe (213) to the outside through the building-side exhaust pipe (S) connected thereto. You. Drain generated in the lower water pipe (11) is the heat exchanger (1)
Is dropped to the drain receiver (80) facing the lower end opening (10) of the, and is discharged to the outside through the drain discharge hole (81).

Although the above embodiment has been described with reference to a water heater, the present invention may be applied to a heater or the like that circulates heated hot water. In the above embodiment, the fan (4) is provided in the air supply passage. However, the fan (4) may be provided in the exhaust passage (21) for forced combustion. In addition to the forced supply / exhaust water heater, F.I. Needless to say, the present invention can be applied to an E (forced exhaust) type water heater.

Further, in the above embodiment, the exhaust passage (21) is formed on the back side of the heat exchanger (1), but the exhaust passage (21) rises on the front side of the heat exchanger (1). It is good also as composition.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an embodiment of the present invention.

FIG. 3 is an explanatory view of a conventional example.

[Explanation of symbols]

 (1) ... heat exchanger (3) ... gas burner (4) ... fan (11) ... water pipe (21) ... exhaust passage (213) ... exhaust connection tube

Claims (1)

(57) [Claims] 1. A heat exchanger (1) comprising a main heat exchange part and a sub heat exchange part is disposed below a gas burner (3), and is provided below a lower end opening of the heat exchanger (1). In a water heater in which a drain receiver (80) is disposed to face the gas burner (3) and a forced exhaust is performed by a fan (4), a main heat exchange part and a sub heat exchange part are provided. The heat exchanger (1) is constructed by continuously arranging the heat exchanger (1) vertically, and the water pipe (11) penetrating the heat exchanger (1) runs in the lateral direction of the appliance, so that the heat exchanger (1) ), The exhaust passage (21) rising from the lower end opening and connected to the exhaust connection tube (213) at the upper end of the appliance is caused to run adjacent to the outer wall of the heat exchanger (1). (2
A water heater in which the width of 1) is set substantially equal to the width of the heat exchanger (1) and the thickness before and after the water heater is flat.