JP3791192B2 - Heat exchanger - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat exchanger used for an instantaneous water heater or the like.
[0002]
[Prior art]
Conventionally, a water heater is provided with a heat exchanger as disclosed in, for example, JIII Journal of Technical Disclosure No. 96-2545. In this heat exchanger, a plurality of heat exchange fins are aligned in the internal space of the exchanger housing, and each heat exchange fin is joined to the inner surface of the housing by brazing. In addition, a water pipe is provided so as to penetrate through the plurality of heat exchange fins, and a burner serving as a heat source is built in the housing, and when high-temperature combustion exhaust gas from the burner passes between the heat exchange fins. Then, heat is exchanged on the heat exchange fin side, whereby water in the water pipe is heated.
[0003]
[Problems to be solved by the invention]
In the conventional heat exchanger, noise may occur due to a resonance phenomenon occurring in the housing.
In the conventional heat exchanger, a heat insulating plate is inserted between the heat exchanging fin and the housing, but according to experiments by the inventors, the effect of reducing the resonance phenomenon could not be confirmed with this heat insulating plate. .
Accordingly, an object of the present invention is to provide a heat exchanger that can reliably reduce the resonance phenomenon of the housing while simplifying the structure.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has taken the following technical means.
That is, the invention of claim 1 is a heat exchanger in which a plurality of heat exchange fins are disposed in an inner space of an exchanger housing through which high-temperature gas passes, and a water pipe is provided so as to penetrate these heat exchange fins. A vibration isolator that is in contact with the housing is attached between the housing and the heat exchange fin, and a fan for sending high-temperature gas toward the heat exchange fin is provided in the exchanger housing. And a guide surface for guiding the wind from the fan to the center side, and shoulders inclined along the guide surface are formed on the left and right sides of the heat exchange fin, the guide surface being a heat exchange fin. The vibration isolator is formed by bending a plate material into a wedge shape.
According to a second aspect of the present invention, in the first aspect of the present invention, the vibration isolator is pressed against the housing in the vicinity of the joint between the heat exchange fin and the exchanger housing.
In such a heat exchanger, the vibration isolator is pressed against the housing, thereby improving the rigidity of the housing, suppressing the vibration of the housing caused by various causes, and reducing noise.
[0005]
Low frequency vibrations generated in each fin when the hot gas passes through the heat exchange fins are transmitted to the housing through the joints, and resonance phenomena due to these low frequency vibrations, and combustion noise of the heat source pass through each fin. Therefore, the resonance phenomenon generated by being transmitted to the housing tends to occur in the vicinity of the portion where the heat exchange fins are joined. This is because the rigidity of the housing is increased by the fin at the portion where the heat exchange fin is joined, but resonance occurs at a portion where the rigidity above or below the joined portion is not secured.
Therefore, if the contact surface of the vibration isolator is pressed against the housing in the vicinity of the joint between the heat exchange fin and the exchanger housing, the above-described resonance phenomenon can be effectively suppressed and noise can be reduced. It becomes possible.
[0006]
In the above heat exchanger, in the case where the fan for sending the hot gas to the heat exchange fin is provided in the exchanger housing, the hot gas generated in the heat source is sent to the heat exchange fin and passes, but the heat distribution May become larger on the center side, and the central portion of the heat exchange fin may be overheated. If left untreated, there will be a temperature difference between the left and right sides and the center of the fin, which may cause distortion due to thermal stress and cracks in each part, and noise will be generated due to the distortion. However, if the vibration isolator has a guide surface that guides the wind from the fan to the center side, the amount of heat concentrated on the center side is alleviated, and the excess of the center part of the heat exchange fins is reduced. Heating can be prevented. Even if the heat source is provided above or on the side of the heat exchange fin, if a temperature difference occurs in the heat exchange fin, the vibration isolator is provided with a guide surface that guides the combustion exhaust gas as described above. It is possible to prevent the temperature difference from occurring.
[0007]
According to the invention of claim 3, in the heat exchanger in which a plurality of heat exchange fins are disposed in the inner space of the exchanger housing through which the high-heat gas passes, and a water pipe is provided so as to penetrate the heat exchange fins, the housing A vibration isolator that is in contact with the housing is mounted between the heat exchange fin and a fan for sending high-heat gas toward the heat exchange fin is provided in the exchanger housing. A guide surface for guiding the wind to the center side, and shoulders inclined along the guide surface are formed on the left and right sides of the heat exchange fin, and the guide surface is a shoulder of the heat exchange fin. A bent edge (21) in a right angle direction is provided on the shoulder, and lower portions of the left and right sides of the heat exchange fin are side edges along the inner surface of the exchanger housing. And the side edge is broken Is provided with a Yukari Gari (8), said bent edge (21) is continuous with the rim (8) bent, and a gap is formed between the side edge and the housing, the gap isolator are pressed, the vibration insulating member has to so that is constituted by forming bending a plate material in a wedge shape.
If the shoulder part which inclines along the said guide surface is formed in the upper part of the right-and-left side of a heat exchange fin and the said guide surface is made to contact the shoulder part of a heat exchange fin, attachment of a vibration isolator will be stabilized. In addition, the vibration isolator can be reliably brought into pressure contact with the portion where the vibration of the housing occurs, and the heat exchange efficiency can be improved and the noise can be reduced while simplifying the structure.
[0008]
The guide surface is preferably formed continuously over two or more heat exchange fins, and according to such a configuration, the guide surface comes into contact with the shoulders of the plurality of heat exchange fins, so that the guide surface is more reliable. In addition, overheating of the center portion of the fin can be prevented, and the mounting stability of the vibration isolator can be further improved.
If the vibration isolator having the contact surface and the guide surface that are inclined to each other as described above is formed by bending a plate material into a wedge shape, the manufacturing cost of the vibration isolator can be reduced and the manufacturing can be facilitated.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The heat exchanger 1 according to the first embodiment of the present invention shown in FIGS. 1 to 3 includes a body plate 2 (heat exchanger housing) configured in a can shape. In the inner space of the body plate 2, a large number of plate-like heat exchange fins 3 are arranged in an aligned state, and a water pipe 4 is provided through the large number of heat exchange fins 3 groups. In this structure, a large number of fins 3 attached to the water pipe 4 at regular intervals are integrated in the inner space of the body plate 2, and the left and right edges of each fin 3 contacting the inner surface of the body plate 2 are arranged. It can be configured by joining by brazing and further brazing and joining the water pipe 4 penetrating the trunk plate 2 to the trunk plate 2 at a penetration position or the like.
[0010]
A burner 5 serving as a heat source is disposed below the internal space of the body plate 2, and high-temperature combustion exhaust gas generated by the combustion of the burner 5 is sent by a blower fan (not shown) provided at the lower end of the body plate 2. When the flue gas is forcibly sent upward and the combustion exhaust gas passes between the heat exchange fins 3 from below to above, heat exchange is performed on the heat exchange fins 3 side, thereby heating water or the like flowing in the water pipe 4. .
[0011]
Each heat exchange fin 3 is formed with a large number of through holes 6 to which water pipes 4 are attached. The lower portions of the left and right side edges of the fin 3 are side edge portions 7 along the inner surface of the body plate 2, and in the illustrated embodiment, the side edge portions 7 are formed straight in the vertical direction. The side edge 7 of the fin 3 is provided with a bent edge 8 in the perpendicular direction, and the bent edge 8 is joined to the middle part of the inner surface of the body plate 2 in the vertical direction by brazing. The bent edge 8 has a narrower vertical width than the side edge 7, and a gap 9 is formed between the upper end of the side edge 7 and the body plate 2.
[0012]
At the upper part of the left and right sides of the fin 3, a shoulder 10 is formed that inclines toward the center of the fin in the upward direction. The shoulder 10 is inclined so as to be along a guide surface of a vibration isolator described later.
[0013]
A trunk coil 20 is disposed on the outer periphery of the trunk plate 2 in the vicinity of the lower part of the portion where the bent edge 8 of the fin 3 is joined to the trunk plate 2. The body coil 20 is in contact with the outer peripheral surface of the body plate 2, and the rigidity of the body plate 2 in this portion is improved, so that vibration is suppressed and generation of noise is prevented.
[0014]
Between the body plate 2 and the heat exchange fin 3, the contact surface 11 is pressed against the body plate 2 in the vicinity of the portion where the bent edge 8 of the fin 3 is joined, and the shoulder portion 10 of the fin 3 abuts. A vibration isolator 13 having a contact surface 12 is attached.
[0015]
The vibration isolator 13 is formed by bending a rectangular plate material so that a wedge is formed by the contact surface 11 and the contact surface 12. The front end portion of the plate piece 14 constituting the contact surface 11 extends beyond the front end of the plate piece 15 constituting the contact surface 12, and the front end portion of the plate piece 14 is the heat exchange fin 3. The vibration isolator 13 is attached and fixed by being inserted into the gap 9 between the side edge 7 and the body plate 2. Preferably, the vibration isolator 13 is attached by press-fitting between the heat exchange fin 3 and the body plate 2 from above, thereby preventing the vibration isolator 13 from rattling and the contact surface 11 being stronger. By being pressed against the plate 2, further noise reduction of the body plate 2 can be achieved.
[0016]
As shown in FIG. 3, the vibration isolator 13 has a long shape extending over the plurality of heat exchange fins 3, whereby the contact surface 12 is continuously formed over two or more heat exchange fins 3. The Rukoto. In addition, it is not necessary to straddle all the fins 3, and it is efficient by bringing the contact surface 11 into contact with a portion having the largest amplitude when a resonance phenomenon occurs, for example, the center portion in the width direction of the body plate 2 In addition, noise can be reduced.
[0017]
In the heat exchanger 1 according to the present embodiment, vibration of the body plate 2 is suppressed by the body coil 20 on the lower side in the vicinity of the joint portion between the bent edge 8 of the heat exchange fin 3 and the body plate 2. . On the other hand, the upper end portion of the body plate 2 is a free end in terms of structural mechanics if the vibration isolator 13 is not attached. Therefore, a resonance phenomenon occurs in the upper end portion of the body plate 2 due to various factors, and noise is generated. May end up. The cause of the noise generated by the resonance phenomenon in the body plate 2 is the combustion noise of the burner 5 and the low-frequency vibrations of the heat exchange fins 3 generated by the flow of hot gas flow through the fins 3 group. It can be considered that resonance is caused by transmission from each fin 3 to the body plate 2.
[0018]
However, according to the present embodiment, the wedge-shaped vibration isolator 13 is press-fitted between the shoulder portion 10 of the fin 3 and the inner surface of the body plate 2, thereby improving the rigidity of the upper end portion of the body plate 2. Thus, the occurrence of a resonance phenomenon can be suppressed and the resonance point can be shifted, so that noise can be efficiently reduced while having a simple structure.
[0019]
In order to verify the noise reduction effect by the vibration isolator 13, the measurement results of the frequency response function of the heat exchanger barrel plate performed by the present inventors are shown in FIG. The result in the heat exchanger of the present embodiment is shown by a solid line, and the result in the heat exchanger with a heat insulating plate disclosed in JIII Journal of Technical Disclosure No. 96-2545 is shown by a dotted line. As shown in the figure, according to the present invention, it was proved that noise is greatly reduced by having the vibration isolator in the body plate resonance range.
[0020]
Further, since the contact surface 12 of the vibration isolator 13 is an inclined surface along the shoulder portion 10 of the fin 3, the contact surface 12 allows the wind generated by the fan provided in the exchanger housing to flow in the lateral width of the fin 3. It acts as a guide surface that forcibly guides to the center in the direction, and can prevent overheating of the central portion of the fin 3. Furthermore, since the guide surface 12 is continuously formed over the plurality of fins 3, it is possible to more reliably prevent overheating of the central portion of the fins 3.
[0021]
Further, the inserted vibration isolator 13 shields the body plate 2 from the flow of high-temperature combustion exhaust gas on the side of the fins 3, so that a heat insulating effect on the body plate 2 can be achieved.
[0022]
FIG. 5 shows a heat exchanger according to a second embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, detailed description thereof is omitted, and different configurations and effects are provided. explain.
In the heat exchanger of the present embodiment, a bent edge 21 in the perpendicular direction is provided on the shoulder 10 of the fin 3. The bent edge 21 is formed only at the lower portion of the shoulder portion 10 in the illustrated example, but may be formed over the entire length of the shoulder portion 10 in the vertical direction.
[0023]
The bent edge 21 of the shoulder portion 10 is formed continuously with the bent edge 8 of the side edge portion 7 and is configured not to be interrupted in the middle.
According to the heat exchanger according to the present embodiment, since the contact area between the tip portion (lower end portion) of the contact surface 12 of the vibration isolator 13 and the fin 3 is increased, the mounting stability of the vibration isolator 13 is improved. Further improved, the bent edge 8 of the side edge 7 and the inner surface of the body plate 2 can be brazed easily and reliably. That is, in the brazing operation, a rod-shaped brazing material is disposed in a gap formed immediately above where the heat exchange fins 3 group disposed in the inner space of the body plate 2 and the inner surface of the body plate 2 come into contact with each other. . Here, since the bent edge 8 of the side edge portion 7 and the bent edge 21 of the shoulder portion 10 are continuous, even if the brazing material is slightly warped or bent, the brazing material bends the bent edges 8 and 21. It is possible to prevent the molten solder from flowing inward and prevent the occurrence of brazing defects.
[0024]
Note that the present invention is not limited to the above-described embodiment, and the design can be changed as appropriate. For example, the vibration isolator can be formed by bending a steel plate or a heat-resistant resin plate, or can be formed by a solid rubber having a wedge-shaped cross section.
In the above embodiment, the vibration isolator 13 is attached and fixed by press-fitting between the heat exchange fin 3 and the body plate 2. However, the vibration isolator 13 is joined to the heat exchange fin 3 by brazing or the like. Alternatively, the vibration isolator 13 may be joined to the inner surface of the body plate 2 by brazing or the like.
[0025]
The position where the vibration isolator 13 is attached is not limited as long as it is a portion where vibration is generated in the body plate 2. For example, as shown in FIG. 6, when the rigidity on the lower side of the trunk plate 2 is low, the vibration isolator 13 is inserted into the gap between the lower portion of the fin 3 and the trunk plate 2, thereby Vibration can be suppressed and noise can be reduced.
[0026]
【The invention's effect】
According to the present invention, since the vibration isolator that is in contact with the housing is attached between the housing and the heat exchange fin, it is possible to suppress the occurrence of vibration in the housing by the vibration isolator, and to make noise effective. Can be reduced.
[0027]
In addition, by pressing the vibration isolator against the housing in the vicinity of the joint between the heat exchange fin and the exchanger housing, a resonance phenomenon caused by vibration transmitted to the housing through the plurality of heat exchange fins can be effectively prevented. It is possible to suppress the generation of noise due to the resonance phenomenon.
[0028]
Further, in the case where the fan for sending the hot gas toward the heat exchange fin is provided in the exchanger housing, the vibration isolator has a guide surface that guides the wind from the fan to the center side. If a shoulder that is inclined along the guide surface is formed on the left-hand side, and the guide surface is brought into contact with the shoulder of the heat exchange fin, an excess of the central portion of the heat exchange fin is caused by the action of the guide surface. Heating can be prevented, and noise caused by this can be prevented, and the mounting stability of the vibration isolator can be improved and the rigidity of the housing can be reliably improved.
[0029]
Further, if the vibration isolator is formed by bending a plate material into a wedge shape, the manufacturing cost of the vibration isolator having the contact surface and the guide surface pressed against the housing can be reduced and the manufacturing can be facilitated. Can do.
[0030]
By mounting the vibration isolator by press-fitting between the heat exchange fin and the housing from above, the vibration isolator is prevented from rattling and the contact surface is more strongly pressed against the housing. The noise of the housing can be further reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a heat exchanger according to a first embodiment of the present invention.
FIG. 2 is an enlarged vertical sectional view of a main part of the heat exchanger.
FIG. 3 is an enlarged perspective view of a main part showing a step of inserting a wedge-shaped vibration isolator.
FIG. 4 is a graph showing measurement results of a frequency radiation function in a body plate portion of the heat exchanger.
FIG. 5 is an enlarged longitudinal sectional view of a main part of a heat exchanger according to a second embodiment of the present invention.
FIG. 6 is an enlarged vertical cross-sectional view of a main part of a heat exchanger according to a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Exchanger housing 3 Heat exchange fin 4 Water pipe 10 Shoulder part 12 Guide surface 13 Vibration isolator

Claims (3)

  In the heat exchanger in which a plurality of heat exchange fins are disposed in the inner space of the exchanger housing through which the high heat gas passes, and a water pipe is provided so as to penetrate these heat exchange fins, the housing and the heat exchange fins A vibration isolator that is in contact with the housing is installed in between, and a fan for sending high heat gas toward the heat exchange fins is provided in the exchanger housing, and the vibration isolator guides the wind from the fan to the center side. A shoulder portion that is inclined along the guide surface, and the guide surface is in contact with the shoulder portion of the heat exchange fin. A heat exchanger, wherein the vibration isolator is formed by bending a plate material into a wedge shape.   The heat exchanger according to claim 1, wherein the vibration isolator is pressed against the housing in the vicinity of a joint portion between the heat exchange fin and the exchanger housing. In the heat exchanger in which a plurality of heat exchange fins are disposed in the inner space of the exchanger housing through which the high heat gas passes, and a water pipe is provided so as to penetrate these heat exchange fins, the housing and the heat exchange fins A vibration isolator that is in contact with the housing is installed in between, and a fan for sending high heat gas toward the heat exchange fins is provided in the exchanger housing, and the vibration isolator guides the wind from the fan to the center side. A shoulder portion that is inclined along the guide surface, and the guide surface is in contact with the shoulder portion of the heat exchange fin. The shoulder portion is provided with a bent edge (21) in a right angle direction, and the lower portions of the left and right sides of the heat exchange fin are side edges along the inner surface of the exchanger housing. A bent edge (8) is provided at the edge. Are, the bent edge (21) is continuous with the rim (8) bent, between the side edge and the housing is formed with a gap, and isolator are pressed into the gap And the vibration isolator is formed by bending a plate material into a wedge shape .

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