JP2652337B2 - Heat exchange 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 heat exchanger, and more particularly, to an exhaust passage for discharging combustion exhaust gas generated in a combustion device to the outside, which is adjacent to a side of a can housing a heat exchanger. The present invention relates to a heat exchange device formed at

[0002]

2. Description of the Related Art As a heat exchange device for improving heat exchange efficiency by absorbing latent heat from combustion exhaust gas, as shown in FIG. 4, a heat exchanger (1) heated by a gas burner (3) is used. And an exhaust passage (21) connected to the exhaust flow downstream. The heat exchanger
(1) is composed of a water pipe (11) and a number of fins (12) (12) provided on the outer periphery thereof, and these are housed in a can (6). The heat exchanger (1) is connected to a water pipe (11).
A main heat exchange section (1a) that absorbs the sensible heat of the combustion exhaust gas mainly from the gas burner (3) downstream of the flowing water, and a passage that is disposed below and mainly absorbs the latent heat of the combustion exhaust gas from the gas burner (3). It is divided into a sub heat exchange section (1b) on the upstream side of the water pipe (11).

The gas hole of the gas burner (3) is set to be horizontal, and the main heat exchange section (1a) is located near the flame forming area. The gas burner (3) is forcibly supplied with air or gas for combustion by a fan (4), whereby the combustion exhaust gas of the gas burner (3) is supplied to the heat exchanger (1). ) Is further discharged to the outside from an exhaust port (2) through an exhaust passage (21) provided continuously downstream of this.

In this apparatus, primary air and gas are supplied to a gas burner (3) by a fan (4) and the primary air and gas are supplied to the gas burner (3).
(3) is burned, and in this state, tap water is supplied from the water pipe (11) located on the side of the sub heat exchange section (1b).
The combustion exhaust gas generated in (3) flows through the main heat exchange section (1a) → sub heat exchange section (1b) → exhaust passage (21) of the heat exchanger (1),
(2) is discharged outside. At this time, the tap water supplied to the water pipe (11) uses the heat generated by the gas burner (3).
(11) and the fins (12) and (12) absorb heat and become hot water and are taken out of the main heat exchange section (1a) .In the heat absorption action for this, the main heat exchange section (1a) Mainly gas burners
The function of absorbing the sensible heat of the combustion exhaust of (3) is performed, and the function of condensing the water vapor in the combustion exhaust of the gas burner (3) and absorbing the latent heat is mainly performed in the sub-heat exchange section (1b). Will be 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) ( 12) to generate drainage by contacting the latent heat at that time with the water pipe.
Heat is absorbed by the water flow in (11). This allows
In the above, not only the sensible heat of the combustion exhaust but also the latent heat is positively absorbed in the heat exchange section to improve the thermal efficiency.

[0005] However, in this heat exchange device, the thermal efficiency cannot be sufficiently improved yet. In this case, the auxiliary heat exchange section (1b) is disposed at the lower part of the apparatus in consideration of the ease of drainage generated in the auxiliary heat exchange section (1b).
Further, the exhaust port (2) is provided at the upper part of the apparatus for the convenience of exhaust. Therefore, to reduce the size of the entire device
As shown in FIG. 4, the exhaust path from the gas burner (3) to the exhaust port (2) is formed in a U-shape, and the exhaust passage (21) is
It must be adjacent to the side wall of (6).

Therefore, in the type in which the exhaust passage (21) is adjacent to the side wall of the can (6), the low temperature combustion exhaust gas that has passed through the sub heat exchanger (1b) passes through the exhaust passage (21). When flowing, the calorific value of the gas burner (3) travels along the side wall of the can (6) and is taken by the combustion exhaust gas in the exhaust passage (21). For this reason, the thermal efficiency cannot be sufficiently improved.

The exhaust port (2) is of a type arranged at the lower part of the apparatus, and the exhaust path from the gas burner (3) to the exhaust port (2) is formed in an inverted U-shape. Even in the case of the type, when the exhaust passage (21) is adjacent to the side wall of the can (6), the same disadvantages as described above occur. The present invention relates to such a “heat exchanger provided in an exhaust path from a combustion device”.
(1), and an exhaust passage (21) disposed downstream of the exhaust gas flow in the can (6) for discharging combustion exhaust to the outside. A heat exchange device formed such that the exhaust passage (21) is adjacent to the side of the can (6). "
It is an object of the present invention to improve thermal efficiency.

[0008]

[Technical Means] The technical means of the present invention taken to solve the above-mentioned problem is that the side part of the can (6) and the exhaust passage (21) are connected to the water pipe of the heat exchanger (1). Auxiliary heat exchange section connected in communication
(5) adjacent to each other ”.

[0009]

The above technical means of the present invention operates as follows. When this device is operated, the combustion exhaust gas generated by the combustion device passes through the exhaust passage (21) from the heat exchanger (1) housed in the can body (6) in the same manner as in the conventional example described above. And is discharged outside. At this time, the side of the can (6) and the exhaust passage (21)
Since the auxiliary heat exchange part (5) connected to the water pipe of the heat exchanger (1) is interposed between the exhaust passage (21) and the exhaust passage (21) on the side of the can (6), The amount of heat moving from the can body (6) to the exhaust passage (21) is smaller than in the case where it is in contact. That is, the amount of heat for heating the side portion of the can body (6) is changed by water exchange and heat exchange by the auxiliary heat exchange section (5).
The amount of heat taken by the combustion exhaust gas in the exhaust passage (21) through the side of the exhaust passage (21) decreases.

[0010]

According to the present invention having the above-described configuration, the present invention has the following specific effects. The amount of heat that heats the side of the can body (6) serves to increase the temperature of the water by conducting water exchange and heat exchange with the auxiliary heat exchange section (5), and exhausts heat through the side of the can body (6). Passage (2
1) Since the amount of heat taken by the combustion exhaust in the interior is reduced, the thermal efficiency is improved.

[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. This is a heat exchanger (1) at the bottom of the water heater body
An air supply box provided with a gas burner (3) above the can body (6) and an air supply chamber (42) above the can body (6).
(7) is provided. A fan (4) is provided above the air supply chamber (42). An exhaust passage (21) disposed downstream of the heat exchanger (1) 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 sub heat exchange section (1b) that is disposed below and mainly absorbs the latent heat of the combustion exhaust gas from the gas burner (3). One main heat exchange part (1a) is composed of a water pipe (11) provided with annular fins (12) (12), and the other sub heat exchange part (1b) is the water pipe (11). In this configuration, annular fins (12) and (12) are provided on the upstream side of the main heat exchange section (1a). The water pipe (11) in the main heat exchange section (1a) has three stages, each of which is curved in a meandering manner in two rows or three rows, and the other sub heat exchange section ( The water pipe (11) of 1b) has a single-stage configuration curved in a meandering manner in three horizontal rows. The lower end of the can (6) is open, and the drain generated in the sub heat exchange section (1b) is discharged to the outside from a drain outlet (8) below the can (6).

The gas burner (3) comprises a perforated plate (31) and a mixing chamber (32) above the perforated plate (31).
A gas nozzle (33) faces (32). The exhaust passage (21)
Is pulled out from the lower end opening of the can (6)
The exhaust port (2) at the downstream end is adjacent to the side of (6) and opens to the upper part of the water heater. And the exhaust passage (21)
Is formed to have the same width as the width of the can body (6) in the running direction of the water pipe (11).

[0014] Between the exhaust passage (21) and the can body (6),
A water jacket (50) as an auxiliary heat exchange section (5) is interposed.
One wall (50a) of the water jacket (50) also serves as a side wall of the can (6), and the other wall (5a) of the water jacket (50).
0b) also serves as a component wall of the exhaust passage (21). In this embodiment, tap water is supplied from the water jacket (50), and the main heat is supplied through the water pipe (11) on the side of the sub heat exchange section (1b) (the lowest water pipe (11)). Hot water is taken out from the water pipe (11) on the exchange section (1a) side (the uppermost water pipe (11)).

Therefore, the fan (4) is operated to operate the mixing chamber (3).
Primary air is supplied to 2) and gas is supplied from the gas nozzle (33) to the mixing chamber (32) to burn the gas burner (3).
In this state, when tap water is supplied from the water jacket (50), the combustion exhaust gas generated by the gas burner (3) firstly turns on the wall surface (50) of the water jacket (50) on the can body (6) side.
a) While contacting with a), the main heat exchange part (1a) of the heat exchanger (1) →
It flows with the sub heat exchange section (1b). Then, the water flow in the water pipe (11) of the main heat exchange section (1a) and the sub heat exchange section (1b) is changed to the gas burner (3).
The generated heat is absorbed from the fins (12) and (12) and the water pipe (11), and is taken out as hot water from the uppermost water pipe (11). In this endothermic action, the action of absorbing the sensible heat of the combustion exhaust gas from the gas burner (3) is mainly due to the main heat exchange section (1a).
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 thereof 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).
Further, since the combustion exhaust gas also contacts the wall surface (50a) of the water jacket (50) on the side of the can body (6), when the combustion exhaust gas passes through the main heat exchange section (1a), the combustion exhaust gas in the portion is not affected. Wall (5
0a), the sensible heat of the combustion exhaust is absorbed by the water flowing in the water jacket (50), and the combustion exhaust is
When passing through (1b), the latent heat of the combustion exhaust is deprived to the water flowing in the water jacket (50) through the wall surface (50a) corresponding to the portion, whereby the water jacket (50) The temperature of the water inside is raised. Then, the combustion exhaust gas cooled below the dew point after passing through the sub heat exchange section (1b) is
The air is discharged to the outside through the exhaust port (2) through the exhaust passage (21). At this time, the combustion exhaust comes into contact with the wall surface (50b) of the water jacket (50) on the exhaust passage (21) side, but water is supplied from the water jacket (50), and this portion is the lowest temperature in the water passage. Because it is in a state, the wall (5
From 0b), the latent heat of the combustion exhaust is further taken away, and the temperature of the water flow in the water jacket (50) is increased. Therefore, in this case, the calorific value of the gas burner (3) is not transferred to the combustion exhaust discharged to the outside through the side of the can body (6). Is improved. In this embodiment, the present invention is applied to a water heater in which not only the sensible heat of the combustion exhaust but also the latent heat is positively absorbed by the heat exchange section to efficiently absorb the heat energy of the combustion exhaust. Thus, the heat absorption efficiency of sensible heat and latent heat is improved.

The above embodiment can be modified as follows. . In the above embodiment, the water jacket (50) is provided on the entire area of the boundary between the can (6) and the exhaust passage (21).
It may be provided only at a part of the boundary. . As shown in FIG. 2, when a large number of fins (55) (55) are provided on the wall surface (50b) of the water jacket (50) on the side of the exhaust passage (21), the heat absorption area of the portion is increased, so that the thermal efficiency is further improved. improves. . As shown in FIG. 3, a partition plate (51) is provided at a central portion in the water jacket (50).
The water passage in (50) is from the side of the wall (50b) where the water jacket (50) faces the exhaust passage (21) to the side of the wall (50a) where the water jacket (50) faces the can body (6) through below the partition plate (51). May be formed. In this case, the water flow on the wall surface (50b) side is in a state where the heat conduction from the gas burner (3) is further blocked, whereby the water flow on the wall surface (50b) side is maintained at a lower temperature. Therefore, the heat efficiency (latent heat absorption efficiency) in the portion is further improved. In addition, water jacket (50)
The thermal efficiency is further improved from the viewpoint that the time during which the water in the air contacts the combustion exhaust increases. Incidentally, it goes without saying that when this configuration is implemented together with the above-described configuration, the thermal efficiency is further improved. . Water supply may be performed from the sub heat exchange section (1b), and the water passage may be from the sub heat exchange section (1b) → the water jacket (50) → the main heat exchange section (1a). . 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 flow pipe (11) of the sub heat exchange part (1b) that absorbs latent heat It becomes a step.

As described above, when the sub heat exchange section (1b) is constituted by a plurality of stages, the auxiliary heat exchange section (5) is provided as in the above embodiment.
In addition to the configuration in which water is supplied from the bottom, water may be supplied from a water pipe (11) such as the lowest stage, the second stage or the third stage from the bottom, and the hot water is removed from the top two stages including the case of the above embodiment. It may be performed from the eyes or the third stage. The heat exchange part that absorbs latent heat is only on the exhaust passage (21) side of the water jacket (50), and all of the water pipe (11) and the fins (12) (12) and the can body of the water jacket (50) are (6) It is also possible to provide a heat exchange section that absorbs sensible heat with the side. . 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). . The present invention mainly absorbs sensible heat in the main heat exchange section (1a) and mainly absorbs latent heat in the sub heat exchange section (1b) .Of course, in the main heat exchange section (1a), It is also applicable to a type that absorbs only sensible heat and mainly absorbs latent heat in the sub heat exchange section (1b). . In the above embodiment, the present invention is applied to a water heater. However, the present invention can be applied to a heat exchanger such as a heater that circulates heated water in addition to the water heater.
In any of the above cases, the heat exchanger included in the heat exchange device may be a type having only a function of absorbing sensible heat in the combustion exhaust gas.

[Brief description of the drawings]

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

FIG. 2 is an explanatory view of a state in which fins (55) and (55) are provided on a water jacket (50).

FIG. 3 is a detailed view of a state in which a partition plate (51) is provided in a water jacket (50).

FIG. 4 is an explanatory view of a conventional example.

[Explanation of symbols]

 (1) ... heat exchanger (6) ... can body (21) ... exhaust passage (5) ... auxiliary heat exchange section

Claims (1)

(57) [Claims] 1. A can body (6) containing a heat exchanger (1) provided on an exhaust path from a combustion device, and a combustion exhaust gas disposed in the can body (6) downstream of an exhaust gas flow. An exhaust passage (21) for discharging to the outside, wherein the exhaust passage (21) is formed so as to be adjacent to the side of the can (6). A heat exchange device in which the side portion of the heat exchanger and the exhaust passage (21) are adjacent to each other via an auxiliary heat exchange section (5) connected to the water pipe of the heat exchanger (1).