JP2000227255A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a small collision of a straightening plate with an inner wall of a can body even when a vibration occurs at the plate caused by a combustion vibration without lowering a thermal efficiency and to prevent an abnormal sound by interposing a buffer material between the inner wall of the can to become an exhaust passage and the plate in the heater. SOLUTION: A buffer material 7 of a vibration absorbing elastic material is arranged between an inner wall of a can 6 of a passage of a combustion exhaust gas and an extended piece 52 of a straightening implement 54 connected with a straightening plate. The piece 52 is brought into close contact with the material 7 and the material 7 is brought into close contact with the wall of the can 6 so that combustion exhaust gas may not be leaked therebetween. Thus, the material 7 is interposed between the piece 52 of the implement 54 and the wall of the can 6, and hence even when the plate is vibrated by the combustion vibration during an operation of the hear exchanger, a small collision of the piece 52 with the wall of the heater 6 can be prevented. Accordingly, an abnormal sound can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger in which a heat absorbing water pipe is disposed in an exhaust passage from a combustion device.

[0002]

2. Description of the Related Art As a heat exchange device for improving heat exchange efficiency from combustion exhaust gas, a heat exchanger in which a main heat exchange section and a sub heat exchange section are arranged in two stages and a gas burner are combined. There are also configurations. The heat exchanger is provided with a water pipe provided with a large number of fins on its outer periphery as a heat exchange part, and sensible heat of combustion exhaust gas generated by combustion of a gas burner disposed thereon and sent to the heat exchanger. And a secondary heat exchange unit that is disposed downstream of the main heat exchange unit and absorbs the remaining sensible heat and the latent heat of the combustion exhaust that are not absorbed by the main heat exchange unit. The heat is exchanged efficiently with the heat exchanger.

In the heat exchanger having such a configuration, it is preferable to arrange the cross sections of the water pipes, which are heat exchange sections, not in parallel but in a staggered manner, because the combustion exhaust gas is distributed over the entire circumference of the water pipe. It is known that the exchange efficiency increases. However, the staggered arrangement has a problem in terms of downsizing the heat exchanger since the volume occupied by the heat exchange section is larger than that in the parallel arrangement.

As means for solving this problem, exhaust concentrating means and exhaust guiding means (rectifying plate) are provided around the water pipes arranged in parallel so that the combustion exhaust gas spreads over the entire peripheral surface of the water pipes.
There is disclosed a technology for arranging a pallet (Japanese Patent No. 2794661).
issue). FIG. 1 shows an example of a conventional heat exchange device using a current plate. This heat exchange device is used, for example, in a water heater, and has a can body (6) for accommodating the heat exchanger (1), and a flame hole portion set downward at the upper part of the can body (6). An air supply box (7) having a gas burner (3) and an air supply chamber (42); and an exhaust pipe (2) connected to a lower end opening of the heat exchanger (1).
It is composed of 1). Gas nozzle (31) in the air supply chamber
A fan (4) is provided above the air supply chamber (42). A drain outlet (8) for discharging drain is provided below the heat exchanger (1).

The heat exchanger (1) comprises a water pipe (11), a number of annular fins (12) (12) provided on the outer periphery thereof, and the can body (6).
The heat exchanger (1) has a main heat exchange section (1a) that mainly absorbs the sensible heat of the combustion exhaust gas, and a latent heat of the combustion exhaust gas mainly cooled by the main heat exchange section (1a). Sub heat exchange section (1b) that absorbs heat and cools it below the dew point to generate drain
Consists of

A water pipe (11) in the main heat exchange section (1a)
Are arranged in a three-tiered manner and are bent in a meandering manner in two or three rows so that the cross-section is staggered.
b) is a one-stage configuration in which the cross sections are curved in a meandering manner in three rows in parallel. In this apparatus, when tap water is supplied from the water pipe (11) located on the side of the sub heat exchange section (1b), the water flowing in the water pipe (11) is changed in the heat exchanger (1). ) And fins
(12) It absorbs the heat of the combustion exhaust gas generated by the combustion of the gas burner (3) through (12), becomes hot water and is taken out from the main heat exchange part (1a) side. Drain generated in the sub heat exchange section (1b) by heat absorption drops below the sub heat exchange section (1b) by its own weight and is discharged to the outside from the drain discharge port (8).

On both sides of the cross section of the water pipe (11) in the sub heat exchange section (1b), a flow straightening plate (5) comprising a pair of guide sections (51) (51) having a semicircular cross section is provided with the water pipe (5). The fins (12) and (12) are arranged concentrically with the fins (12) and (11).
In order to prevent the combustion exhaust gas from passing through without heat exchange with 1), the inner wall of the can (6)
(5) It is so close that the flow of combustion exhaust between them can be shut off. A pair of guides (51) surrounding the water pipe (11)
The upper end and the lower end of (51) face each other at a small interval, and open portions are formed above and below the water pipe (11).

[0008] With the above configuration, the combustion exhaust gas flows in from the upper opening, and flows through the water pipe (11) and the fin (1).
2) Since it flows along the water pipe (11) between (12) and is discharged from the opening below, the combustion exhaust intensively contacts the water pipe (11). Thereby, the sub heat exchange section (1b) arranged in parallel
Since the heat efficiency of the heat exchanger (1) increases and the volume of the heat exchanger (1) can be reduced without lowering the heat absorption capacity, the heat exchanger can be made more compact.

However, since the flow straightening plates (5) and (5) are provided so as to be close to the inner wall of the can body (6) so as to block the flow of the combustion exhaust gas, due to the combustion vibration of the gas burner (3). There is a problem that the rectifying plate (5) vibrates and small collisions between the rectifying plate (5) and the inner wall of the can body (6) are repeated, thereby generating abnormal noise. As a method for eliminating the abnormal noise, a method of widening the gap between the current plate (5) and the can body (6) or welding and fixing the both can be considered, but the former passes through this gap as described above. Combustion exhaust gas that passes without heat exchange is generated, resulting in reduced thermal efficiency, and the latter involves increased manufacturing man-hours, resulting in higher costs.

[0010]

SUMMARY OF THE INVENTION The present invention relates to such a "a plurality of cylindrical can bodies (6) serving as exhaust passages from a combustion device, which are arranged side by side across the exhaust passages. A finned water pipe (11) for absorbing heat and the finned water pipe (1) for collecting combustion exhaust gas on each surface of the water pipe (11).
A pair of guides (51) and (5) disposed along the water pipe (11) so as to surround at least the outer peripheral section on the downstream side of the exhaust flow of (1).
A heat exchange device comprising a rectifying plate (5) made of (1)), generation of abnormal noise generated between the rectifying plate (5) and the inner wall of the can (6) without lowering the thermal efficiency. The challenge is to prevent

[0011]

Means for Solving the Problems * 1. The technical means of the present invention for solving the above-mentioned problems is that "the exhaust gas is disposed between the straightening plate (5) and the inner wall of the can body (6)". And a cushioning material (7) capable of blocking the noise. "

The above technical means operates as follows.
Since the cushioning material (7) is provided between the current plate (5) and the inner wall of the can (6), the direct current between the current plate (5) and the inner wall of the can (6) must be in direct contact. The straightening plate due to combustion vibration
Even if vibration or micromotion occurs in (5), no abnormal noise is generated because no small collision occurs with the inner wall of the can (6).

Since the cushioning member (7) is made of a material capable of shutting off combustion exhaust, the inner wall of the can (6) and the rectifying plate are formed.
The passage of exhaust gas between (5) and (5) is blocked, and the entire combustion exhaust gas is guided to the finned water pipe (11).

[0014]

According to the present invention having the above configuration, the following specific effects are obtained. Prevents generation of abnormal noise due to repeated small collisions between the inner wall of the can body (6) and the rectifier plate (5) due to the vibration of the rectifier plate (5) caused by combustion vibration during operation of the heat exchanger. it can.

Since the passage of the combustion exhaust between the inner wall of the can body (6) and the straightening plate (5) is blocked, the entire combustion exhaust comes into contact with the finned water pipe (11). The heat exchange efficiency increases. [Others] * In the paragraphs 2 and 1, the paragraph “The water flow pipes (11) with heat absorbing fins arranged side by side are arranged in two stages in the upper and lower stages in the flow direction of the combustion exhaust gas. The guide portions (51) and (51) opposed to each other with the cross section of 11) being connected by a connecting plate (500), and the connecting plate (500) is provided with the finned passages arranged in the upper and lower two stages. The fins (12) and (12) of the water pipes (11) and (11) are sandwiched by each other. ''
Are the upper and lower water pipes (11) (11)
Fins (12) and (12), the rectifier plates (5) and (5) need not be supported on the inner wall of the can (6).
Since it is fixed in a stable state in (6), there is no generation of abnormal noise due to vibration between the rectifying plate (5) and the fins (12), and the mounting of the rectifying plate (5) is simple. * In item 3, 1 or 2, the "dampening material (7) is made of silicon rubber or rubber material such as EPDM which is resistant to acid, heat, and vibration". In addition, since vibrations and shocks are absorbed by the cushioning material (7), generation of abnormal noise due to vibration of the rectifying plate (5) can be more reliably prevented or reduced.

[0016]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. The embodiment shown in FIG. 2 is an embodiment in which the present invention is applied to, for example, a water heater provided with a heat exchange device having a function of condensing combustion exhaust gas and absorbing the latent heat. The heat exchanger of this example is provided with a can (6) constituting a heat exchanger (1) inside a water heater main body, and a perforated plate type gas burner (3) on the top of the can (6). And an air-fuel mixture chamber (3a) is provided at the top. An exhaust pipe (21) provided with an exhaust port (2) for discharging the cooled combustion exhaust is connected to the lower end opening of the heat exchanger (1).

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 of the gas burner (3). The main heat exchange section (1a) has a configuration in which a plurality of rectangular fins (12) (12) inscribed in the can body (6) are provided in the water pipe (11),
The other sub heat exchange section (1b) has an annular fin (1b) on the downstream side of the exhaust flow from the water pipe (11) located in the main heat exchange section (1a).
2) A configuration provided with (12). The annular fin (12)
The diameter of (12) is set so as not to come into contact with the fins (12) and (12) of the adjacent water pipe (11) and the inner wall of the can (6) as close as possible.

In the heat exchanger (1) of this example, a water pipe (11)
In the main heat exchange part (1a), the upper stage is meanderingly bent in a staggered two-stage configuration consisting of four rows in the lower row and three rows in the lower row, and in the other sub heat exchange section (1b) It is configured to bend in a meandering manner so as to be arranged in three rows and two rows in parallel. In addition, outside of the can body (6) of the combustion chamber (60) provided between the gas burner (3) and the main heat exchange section (1a), the A water pipe (11) is spirally wound in order to prevent heat loss of the can body (6), so that the heat of the can (6) is absorbed by the water pipe (11).

The heated water is supplied to the auxiliary heat exchange section (1b) at the lower end.
The heat is supplied from the water pipe (11) and goes through each water pipe (11) in the order of the sub heat exchange section (1b) and the main heat exchange section (1a), during which heat exchange with the combustion exhaust is performed to absorb heat. Then, it is sent upward from the end of the water pipe (11) of the main heat exchange section (1a) through the water pipe (11) spirally wound around the outside of the can body (6), and from the upper end. It is designed to be taken out as hot water.

The finned water pipe (1) of the sub heat exchange section (1b)
1) As shown in FIG. 3 and FIG.
Rectifying device (54) in which two rectifying plates (5) are connected
The upper and lower finned water pipes (11) and (11) are sandwiched between the extension pieces (52) and (52) so as to be inscribed in the can body (6). The current plate (5) has a pair of guide portions (51) (51) bent along an arc on the lower side of the fins (12) (12) provided in the water pipe (11) located at the upper stage. And is connected to the adjacent current plate (5) (5) at a portion forming a convex portion having a mountain-shaped cross section. The pair of guide portions (51)
(51) are arranged facing each other so as to maintain a predetermined interval, and are mutually connected and integrated by a connecting plate (500), and the interval between the connecting plates (500) and (500) is It is a long hole (50) which is an exhaust passage. An extension piece (52) parallel to the inner wall of the can body (6) is connected to the guide section (51) near the inner wall of the can body (6).

Between the extension pieces (52) and (52) of the rectifier (54) and the inner wall of the can body (6), a cushioning material (7) made of silicone rubber which is a vibration absorbing elastic body is provided. ) Are arranged, and the space between the extension piece (52), the cushioning material (7), and the inner wall is tightly closed so as to substantially prevent the combustion exhaust gas from leaking from the space. The cushioning material (7) may be fixed to one of the extension piece (52) of the rectifier (54) and the inner wall of the can (6). Extension piece
(52) It is attached to (52), and the cushioning material is
(7) is installed close to the inner wall of the can (6).

As a material of the cushioning material (7), EPDM rubber or the like may be used in addition to the above materials. However, acid resistance to drain containing oxide (about pH 2 to 3) in the combustion exhaust gas and combustion exhaust gas Any material can be used as long as it exhibits heat resistance (heat-resistant temperature: 150 ° C. or higher) and sufficient airtightness between the current plate (5) and the inner wall of the can (6). With the above configuration, the heat exchange device of this example operates as follows. Mixture chamber (3a) provided above gas burner (3)
The combustion exhaust gas generated by performing forced air supply from a combustion air fan (not shown) and supplying gas to burn the gas burner (3) is similar to the conventional heat exchange device of FIG. While being absorbed, it flows from the upper part to the lower part, and the combustion chamber (60) → the main heat exchange part (1a) → the sub heat exchange part (1b) → the exhaust pipe (2
1) → Exhausted through the exhaust port (2). On the other hand, when tap water is supplied from the upstream part of the water pipe (11) together with the combustion of the gas burner (3), the water in the water pipe (11) is changed to the sub heat exchange part (1b) →
Main heat exchange part (1a) → While passing through the water pipe (11) wound around the can body (6), the heat generated by the gas burner (3)
The water is absorbed through (11) and the fins (12) and (12) provided in the water pipe (11), and is taken out from the downstream end of the water pipe (11) as hot water. In this heat absorbing action, the main heat exchange section (1a) following the combustion chamber (60) mainly performs an action of absorbing the sensible heat of the combustion exhaust gas of the gas burner (3), and the sub-heater located below the gas burner (3). In the heat exchange section (1b), the action of mainly absorbing the latent heat of the combustion exhaust gas and cooling it to a temperature equal to or lower than the dew point temperature to condense and generate drain is performed.

At this time, the combustion exhaust gas generated by the gas burner (3) and sent to the heat exchange sections (1a) (1b) is supplied to the main heat exchange section.
The water pipe (11) of (1a) and a can body provided in the water pipe (11)
It comes into contact with the rectangular fins (12) and (12) inscribed in (6) and loses its sensible heat. Next, as shown in FIG. 3, the combustion exhaust gas flowing into the sub heat exchange section (1b) is guided to the upper section by the guide sections (51) (51) provided on each straightening plate (5). Flow along the outer peripheral surface of the water pipe (11), and the straight hole (5
From 1), it is concentrated on the top of the lower water pipe (11) and fins (12) (12). Thereby, the heat absorption from the combustion exhaust gas is effectively performed, so that the thermal efficiency is improved.

Further, since the cushioning material (7) is interposed between the extension pieces (52) and (52) of the rectifier (54) and the inner wall of the can body (6), the conventional heat exchange device has As described above, the rectifying plate (5) vibrates due to the combustion vibration during the operation of the heat exchange device, and the rectifying plate (5) is vibrated.
Small collisions repeatedly occur with the inner wall of the can body (6) close to the can, thereby preventing generation of unpleasant noise and vibration.

In the above example, only one rectifying device (54) is disposed between the upper and lower stages of the two-stage auxiliary heat exchange unit (1b), as shown in FIG. , Sub heat exchange section (1b)
In a three-stage configuration, and the rectifying device (54) may be disposed so as to be sandwiched between the respective stages. The heat exchange device of the present invention is not limited to the above embodiment, and its flow pipe is used as a means for concentrating combustion exhaust gas in order to improve the heat exchange efficiency of the heat exchange units (1a) and (1b) of the heat exchange device. A rectifying plate (5) is arranged around the periphery of (11), and a buffer material (7) is interposed in order to block the gap between the rectifying plate (5) and the can body (6). Any heat exchange device may be used. Therefore, each heat exchange section (1a) (1
The arrangement and number of the water pipes (11) in b), the shape of the fins (12) provided in the water pipe (11), and the shape of the current plate (5) are the same as those shown in FIG. It may be different from the above example like a device.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a conventional heat exchange device.

FIG. 2 is a cross-sectional view of the heat exchange device according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view of a sub heat exchange section (1b) according to the first embodiment of the present invention.

FIG. 4 is a cross-sectional view of a sub heat exchange section (1b) according to Embodiment 2 of the present invention.

FIG. 5 is a perspective view of a rectifying device (54) according to the embodiment of the present invention.

[Explanation of symbols]

(1) ... heat exchanger, (11) ... water pipe, (11a) ...
Main heat exchange part, (11b) ・ ・ ・ Sub heat exchange part, (12) ・ ・ ・ Fin, (3) ・ ・ ・ Gas burner, (5) ・ ・ ・ Rectifier plate, (51) ・
..Guiding part, (500) ... Connecting plate, (6) ... Can body,
(7) ... cushioning material

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takeshi Fukaya 2-26, Fukuzumi-cho, Nakagawa-ku, Nagoya Rinnai Co., Ltd. Hakuraku Apartment 102 F term (reference) 3L036 AA06 3L065 DA04

Claims (3)

[Claims] 1. A plurality of heat-absorbing finned water pipes (11) arranged side by side in a tubular can body (6) serving as an exhaust passage from a combustion device so as to cross the exhaust passage. The water pipe (11)
A pair of finned water pipes (11) arranged along the water flow pipe (11) so as to surround at least the downstream side cross-sectional outer peripheral portion of the exhaust flow of the finned water pipe (11) in order to collect the combustion exhaust gas on the surface of each. In a heat exchange device provided with a rectifying plate (5) comprising guide portions (51) and (51), a buffer capable of shutting off combustion exhaust between the rectifying plate (5) and the inner wall of the can body (6). Heat exchange device with material (7) interposed. 2. The heat exchange device according to claim 1, wherein a group of water flow pipes (11) having heat-absorbing fins arranged in parallel are arranged in upper and lower stages in the flow direction of the combustion exhaust gas. Water pipe (11)
The guides (51) and (51) facing each other across the cross section of
00), and the connecting plate (500) is connected to the fins (12) of the finned water pipes (11) (11) arranged in the upper and lower two stages.
(12) A heat exchange device configured to be sandwiched between each other. 3. The cushioning material (7) is made of silicone rubber or EP.
2. A rubber material made of an acid, heat and vibration absorbing material such as DM.
Or the heat exchange device of claim 2.