JPH07133961A - Hot-water supply appliance - Google Patents

Abstract

PURPOSE:To make use of an existing exhaust piping arrangement or the like as it is, which arrangement is formed on a building, in a hot-water supply appliance, in which a heat exchanger is arranged below a gas burner, and forced combustion and forced exhaust are effected on the gas burner by a fan. CONSTITUTION:Water through pipes 11 passing through a heat exchanger 1 run laterally of an appliance, and an exhaust passage 21 which is flat at the front and the rear extends upward from a lower end opening of the heat exchanger 1 along and adjacent to the front wall or rear wall of the heat exchanger 1 to be connected to an exhaust connection cylinder 213 at the upper end of the appliance. Further, the exhaust passage 21 is set to have substantially the same width as that of the exhaust passage 21.

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 that allows combustion exhaust gas to pass downward to a heat exchanger. When the water heater of the above type is installed in place of the water heater, the existing exhaust pipe structure formed on the building side can be used as it is to facilitate the replacement work.

[0002]

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

In this device, when the gas burner (3) is forcibly combusted by using the fan (4) and tap water is supplied from the sub heat exchanger (1b) side, the combustion exhaust gas generated by the gas burner (3) is generated. The main heat exchange section (1a) on the upper side is heated by the sensible heat of. Then, the combustion exhaust gas whose temperature has been lowered after heating the heat exchange portion (1a) is a sub heat exchange portion (1b) through which low temperature water flows.
It is cooled below the dew point when passing through
Drain is generated. Then, the latent heat generated at this time is absorbed by the sub heat exchange section (1b), and the sub heat exchange section (1b) is absorbed.
It is designed to raise the temperature of the water flow in the part. In this way, in the above-mentioned one, the heat exchange efficiency is improved by positively utilizing the latent heat. The drain generated when the combustion exhaust gas passes through the sub heat exchange portion (1b) is discharged to the outside through the discharge hole (81) of the drain receiver (80) located below the drain.

However, in the above-mentioned conventional one, when replacing the existing water heater of the type that does not positively utilize latent heat, it is essential to change the existing exhaust pipe structure formed on the building side. Therefore, there is a problem that the work is troublesome. In the hot water heater of the type that does not actively use latent heat, the heat exchanger is installed above the gas burner, and the exhaust connection tube (213) is installed above it so that the combustion exhaust gas flows upward in the heat exchanger. It is generally configured to pass through. Therefore, the upstream end of the exhaust pipe (S) on the building side, which is formed at the location where such a water heater is installed, is
It is located in the part corresponding to the upper side of the water heater. However, in the above-mentioned conventional one that positively uses latent heat, since the exhaust connection tube (F) projects to the lower side,
Special work is required to connect the exhaust connection tube (F) and the upstream end of the exhaust pipe (S) formed on the building side with a separately prepared connection tube (T), and replacement work is troublesome. This is the case.

The present invention has been made in view of the above-mentioned points. "The heat exchanger (1) is arranged below the gas burner (3) and the lower end opening of the heat exchanger (1) is arranged below. To drain receiver
(80) are arranged opposite to each other, and the above gas burner is installed by the fan (4).
(3) In the water heater designed to forcibly burn and forcibly exhaust '', the existing exhaust piping structure etc. formed on the building side can be used as it is, so that latent heat is not positively used It is an object of the present invention to facilitate replacement work with an existing water heater of a type (a water heater of a type in which combustion exhaust gas passes upward in a heat exchanger).

[0006]

Means for Solving the Problems The technical means of the present invention for solving the above-mentioned problem is that "a water pipe (11) penetrating the heat exchanger (1) runs in the lateral direction of the device, Exhaust passage that rises from the bottom opening and connects to the exhaust connection tube (213) at the top of the instrument
(21) is formed so that the exhaust passage (21) passes near the outer wall of the heat exchanger (1) in the longitudinal direction of the device, and
The width of the exhaust passage (21) is set to be substantially the same as the width of the heat exchanger (1), and the thickness before and after the exhaust passage (21) is made flat ”.

[0007]

The above technical means operates as follows. Exhaust passage (21) that rises from the lower end opening of the heat exchanger (1) to the front side or rear side (front side or rear side in the front-back direction of the device)
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 installing the water heater of the present invention in place of a general upper exhaust type appliance as a water heater that does not actively use latent heat, the exhaust connection tube (213) located at the upper end of the appliance and the upper end of the appliance are installed. It suffices to simply connect the ends of the exhaust pipe (S) on the building side formed so as to correspond to the sections. As described above, according to the above technical means, it is not necessary to perform a special construction for connecting the existing exhaust pipe formed on the building side and the instrument body with a separately prepared connecting cylinder or the like.

[0008]

[Effect] The present invention has the following unique effects. Since the equipment can be replaced without requiring special work to connect the equipment body and the exhaust pipe on the building side with a separately prepared connecting cylinder etc.,
Even when replacing with an existing water heater of a type that does not positively utilize latent heat (a type in which combustion exhaust passes upward in the heat exchanger), the work can be easily performed.

The width of the exhaust passage (21) is enlarged so that the width is almost equal to the width of the heat exchanger (1), and the exhaust passage (21) is opened from the lower end opening of the heat exchanger (1) to the front or rear surface thereof. Since the exhaust passage (21) can be flattened by forming the sides up and down, 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]

EXAMPLES Next, examples of the present invention described above will be explained.
The embodiment shown in FIG. Can body that constitutes the heat exchanger (1) under the water heater body of the F (forced air supply and exhaust) type water heater
(6) is installed and a gas burner is placed on the top of the can body (6).
(3) An air supply box (7) having an air supply chamber (42) arranged above the gas burner (3) (longer in the front-back direction in FIG. 1). Is provided.
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 vertically.

As shown in FIGS. 1 and 2, the exhaust passageway (21) includes an exhaust guide plate (210), side plates (211) (211) formed by bending both sides thereof, and a heat exchanger (6). It is composed of a rear wall (61) and an extension plate (63) connected to the rear wall (61). The exhaust guide plate (210) is arranged so as to face the 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) portion at the upper end of the instrument body.
The 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 side plates (211) (211) on both sides of the exhaust guide plate (210) and the can body (6)
The exhaust passage (2) surrounded by the rear wall (61) and its extension plate (63).
1) is formed. And in this thing, the exhaust passage (21)
The rear wall (61) of the can body (6) is used as a part of the constituent wall of (1), and the lateral widths of the exhaust passage (21) and the can body (6) are substantially the same. Therefore, the exhaust passage (2
1) can be formed vertically in the state of being adjacent to the can body (6) without reducing the passage area, and the device body can be made thin. In addition, the downstream end of the exhaust passage (21) is connected to the exhaust connection pipe (213) at the upper end of the device, and the uppermost flow end of the air supply passage (49) surrounds the exhaust pipe (213). ). Therefore, when installing the water heater of the present embodiment in place of the general upper exhaust type appliance as a water heater that does not positively utilize latent heat, when installing the water heater of the present embodiment, 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 side of the building that are formed so as to correspond to the upper end of the appliance. In addition, in FIG. 1, (K) is a casing
(K1) is a front lid that covers the front opening (K3).

Further, the portion of the exhaust guide plate (210) facing the lower end opening (10) of the heat exchanger (1) is recessed in a funnel shape as a whole to form a drain receiver (80). A drain discharge hole (81) is provided at the bottom of the drain receiver (80). The heat exchanger (1) comprises a large number of fins (12) (12), a water pipe (11) penetrating the fins (12), and a can body (6) for containing them. The bottom of () is open as described above. In this embodiment, one water pipe (1
The water pipe (11) has a four-stage structure by penetrating the can body (6) in a meandering state. Each stage has a horizontal row or three rows, and tap water is supplied from the lowermost water pipe (11) and hot water is taken out from the upper water pipe (11). Further, below each step of the water pipe (11), a guide plate (15) facing each water pipe (11) at a distance is provided, and the guide plate (15) is It is curved downward and has an opening (16) in its center.
As a result, the combustion exhaust gas generated in the gas burner (3) and flowing downward passes through the opening (16) so that the combustion exhaust gas can be efficiently applied to the entire circumferential surfaces of the water pipe (11) and the fins (12). The heat absorption efficiency is improved by bringing them into contact with each other. In addition, the drain generated in the water pipes (11) (11) and the fins (12) (12) is the opening (1) of the guide plate (15).
It is designed to be discharged to the outside through the drain discharge hole (81) below the can body (6) through the drain (6).

The gas burner (3) is of the all-primary air combustion type and comprises a burner mixing pipe (32) and a plurality of gas nozzles (31) (31) facing the burner mixing pipe (32). The primary air is squeezed and supplied by the fan (4), but in order to uniformly supply the primary air to the plurality of gas burners (3), the fan (4) and the gas burner (3) are supplied.
A dispersion plate (45) is interposed between and.

The fan (4) is operated to supply the primary air to the mixing pipe (32) and the mixing pipe (3) is supplied from the gas nozzles (31) (31).
When the gas burner (3) is burned by supplying gas to (2) and tap water is supplied from the lower part of the water pipe (11) in this state, the water pipe (1
For the water flow in 1), the amount of heat generated by the gas burner (3) must be
(12) It is absorbed from (12), etc., and becomes hot water from the upper part of the water pipe (11) and is taken out to the outside. In the endothermic action at this time,
The action of absorbing the sensible heat of the combustion exhaust gas of the gas burner (3) is mainly performed by the upper water passage pipe (11), and the lower water passage pipe (11) mainly operates by the gas burner (3). The action of condensing the combustion exhaust gas and absorbing the latent heat thereof is performed. That is, in the water pipe (11) on the lower stage side, mainly, the sensible heat is taken away and the cooled combustion exhaust gas is further cooled to below the dew point temperature to generate drainage, and the latent heat water pipe at that time is generated.
It is absorbed in the water flow in (11). Then, the combustion exhaust gas that has passed through the gas burner (3) passes through the exhaust passage (21) and is discharged to the outside from the exhaust connection pipe (213) through the exhaust pipe (S) on the building side connected to it. It In addition, the drain generated in the water pipe (11) on the lower side is the heat exchanger (1).
It is dropped on the drain receiver (80) facing the lower end opening (10) and is discharged to the outside through the drain discharge hole (81).

In the above embodiment, the water heater has been explained, but the present invention may be applied to a heater of a system in which heated hot water is circulated. Further, in the above embodiment, the fan (4) is provided in the air supply passage, but the fan (4) may be provided in the exhaust passage (21) for forced combustion. In addition, it is not limited to the forced air supply / exhaust type water heater. It goes without saying that the present invention can also 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 may be configured.

[Brief description of drawings]

FIG. 1 is a vertical 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 diagram of a conventional example.

[Explanation of symbols]

 (1) ・ ・ ・ Heat exchanger (3) ・ ・ ・ Gas burner (4) ・ ・ ・ Fan (11) ・ ・ ・ Water pipe (21) ・ ・ ・ Exhaust passage (213) ・ ・ ・ Exhaust connecting tube

Claims (2)

[Claims] 1. A heat exchanger (1) is arranged below a gas burner (3), and a drain receiver (80) is arranged below a lower end opening of the heat exchanger (1) so as to face each other. In a water heater in which the gas burner (3) is forcibly combusted and forcibly exhausted by the fan (4), the water pipe (11) that penetrates the heat exchanger (1) should run in the lateral direction of the appliance. And heat exchanger (1)
Rise from the bottom opening of the
Forming an exhaust passage (21) connected to (3) and
(21) passes near the outer wall of the heat exchanger (1) in the front-back direction of the device, and further, the width of the exhaust passage (21) is set to the heat exchanger.
A water heater that is set to be approximately the same width as (1) and has a flattened front and back thickness. 2. The exhaust passage (21) is caused to travel in a manner adjacent to the outer wall of the heat exchanger (1), and the constituent wall of the heat exchanger (1) is used as a boundary wall between the two. Water heater.