JP7018814B2 - Heat exchanger - Google Patents

Description

The present invention relates to a heat exchanger having a flow path unit.

As a device having a heat exchanger, for example, a gas water heater that heats water by a combustion gas generated from a burner is known.

In order to improve the heat exchange efficiency, an expensive copper material is used for the primary heat exchanger having a heat transfer fin structure. In order to further improve the heat exchange efficiency, there is an additional arrangement of secondary stainless steel heat exchangers for latent heat recovery. For example, such a gas water heater includes a primary heat exchanger arranged on the upstream side of the combustion gas and a secondary heat exchanger through which the combustion gas that has passed through the primary heat exchanger is flowed. There is. There is a technique disclosed in Patent Document 1 as a prior art relating to a heat exchanger used in a gas water heater.

FIG. 7 schematically shows the technique disclosed in Patent Document 1. The heat exchanger 100 includes a primary heat exchanger 200, a secondary heat exchanger 300 arranged above the primary heat exchanger 200, and a water supply pipe 400 connected to the secondary heat exchanger 300. Have.

The primary heat exchanger 200 has two layers of flow path body units 201 and 202 arranged in the vertical direction, and a storage case 203 for accommodating these two flow path body units 201 and 202. The flow path unit 201, 202 has a plurality of fins 204 (only some fins are shown) arranged in a layered manner. The fins 204 receive the heat of the passing combustion gas and transfer the heat to the flow path units 201 and 202. Therefore, a copper material having excellent thermal conductivity is used.

Similarly, the secondary heat exchanger 300 has five layers of flow path body units 301 to 305 arranged in layers in the vertical direction, and a storage case 306 for accommodating these flow path body units 301 to 305. .. In the secondary heat exchanger 300, acidic condensed water is generated by latent heat recovery. Therefore, a stainless steel material having excellent corrosion resistance is used.

The combustion gas is introduced into the storage case 203 of the primary heat exchanger 200 by a blower. The combustion gas that has passed through the storage case 203 further passes through the storage case 306 of the secondary heat exchanger 300 and is discharged.

The water supplied from the water supply pipe flows in the flow path unit units 301 to 305 of the secondary heat exchanger 300, and is heated by the heat of the combustion gas flowing around.

The warmed water is introduced from the secondary heat exchanger 300 to the flow path unit 201 of the primary heat exchanger 200. By the same operation as the secondary heat exchanger 300, the primary heat exchanger 200 heats the heat to a temperature suitable for the set temperature, and the hot water is discharged.

Japanese Unexamined Patent Publication No. 2014-137208

The flow path unit 201 of the primary heat exchanger 200 has four U-shaped connecting pipes 206 that connect the four pipes 205a to 205b arranged in parallel to each other and the ends of the adjacent pipes 205a to 205b. , 207 and.

A plurality of fins 204 are joined to the pipes 205a to 205b. Further, the end portion of the pipe 205a and the end portion of the pipe 205b are joined to the connecting pipe 206, respectively. Similarly, the pipes 205c and 205d are joined to the connecting pipe 207. For example, as the number of pipes increases, so does the number of connecting pipes required, increasing costs.

Therefore, it is desirable to manufacture the heat exchanger 100 at a low cost, but as described above, an expensive copper material is adopted for the primary heat exchanger 200, and the secondary heat exchanger 300 is used for condensed water. In consideration of corrosion resistance, stainless steel is used. The heat exchanger 100 is composed of separate primary heat exchangers 200 and secondary heat exchangers 300 made of different materials from each other, and it is difficult to make a simple configuration.

An object of the present invention is to provide a heat exchanger having a flow path unit having a simple structure.

According to the invention of claim 1, at least a flow path body unit having a plurality of cylindrical portions located parallel to each other and having a first fluid flowing inside the cylindrical portions and a second fluid flowing around the cylindrical portions. In one heat exchanger
The flow path body unit is composed of a first plate material and a second plate material superposed on the first plate material.
The first plate material comprises a plurality of first half-cylinder portions having open facing surfaces and a plurality of first connecting portions provided between the plurality of first half-cylinder portions adjacent to each other. Have and
The second plate material is provided between a plurality of second half-cylinder portions facing the plurality of first half-cylinder portions and a plurality of second half-cylinder portions adjacent to each other. With a second connecting part of,
The plurality of first connecting portions and the plurality of second connecting portions are joined to each other to form a plurality of joined portions.
The plurality of first semi-cylindrical portions and the plurality of second semi-cylindrical portions constitute the plurality of cylindrical portions through which the first fluid flows .
The plurality of joints have ventilation holes through which the second fluid can pass.
A plurality of the flow path body units having the ventilation holes are arranged with a gap between them.
At least one of the distances between the plurality of adjacent flow path unit units or the distances between the cylindrical portions on both sides of the ventilation hole is reduced from upstream to downstream of the second fluid. A heat exchanger is provided characterized by being configured .

According to the invention of claim 2, at least a flow path body unit having a plurality of cylindrical portions located parallel to each other and having a first fluid flowing inside the cylindrical portions and a second fluid flowing around the cylindrical portions. In one heat exchanger
The flow path body unit is composed of a first plate material and a second plate material superposed on the first plate material.
The first plate material comprises a plurality of first half-cylinder portions having open facing surfaces and a plurality of first connecting portions provided between the plurality of first half-cylinder portions adjacent to each other. Have and
The second plate material is provided between a plurality of second half-cylinder portions facing the plurality of first half-cylinder portions and a plurality of second half-cylinder portions adjacent to each other. With a second connecting part of,
The plurality of first connecting portions and the plurality of second connecting portions are joined to each other to form a plurality of joined portions.
The plurality of first semi-cylindrical portions and the plurality of second semi-cylindrical portions constitute the plurality of cylindrical portions through which the first fluid flows.
The plurality of joints have ventilation holes through which the second fluid can pass.
A plurality of the flow path body units having the ventilation holes are arranged with a gap between them.
The first plate material has a first upright portion having an edge upright over the entire circumference, and the second plate material has a first upright portion having an edge upright over the entire circumference. It has 2 standing parts and
The first upright portion and the second upright portion are joined to each other to form a plurality of cylindrical portions and a peripheral wall portion surrounding the plurality of ventilation holes.
The peripheral wall portions of each of the plurality of flow path body units are joined to each other to form a wall surface portion that serves as an outer peripheral surface of the plurality of flow path body units .
At least one of the first upright portion and the second upright portion constituting the peripheral wall portion has a groove portion with an open facing surface side, and this groove portion constitutes a part of a gutter portion through which the first fluid flows. A heat exchanger characterized by the fact that it is used is provided.

As described in claim 3 , preferably, the first plate material has a first upright portion formed by erecting the edges over the entire circumference, and the second plate material has all the edges. It has a second upright part configured by standing up over the circumference,
The first upright portion and the second upright portion are joined to each other to form a plurality of cylindrical portions and a peripheral wall portion surrounding the plurality of ventilation holes.
The peripheral wall portions of each of the plurality of flow path body units are joined to each other to form a wall surface portion which is an outer peripheral surface of the plurality of flow path body units.

As described in claim 4 , preferably, at least one of the first upright portion or the second upright portion constituting the peripheral wall portion has a groove portion whose facing surface side is open.
This groove portion constitutes a part of the side groove portion through which the first fluid flows.

As described in claim 6, preferably, the plurality of flow path units are arranged in the vertical direction.
The groove portion is provided in the lower plate material, and the groove portion is provided in the lower plate material.
The upper plate material has a lid portion that closes the groove portion, and the lid portion is set to a downward slope from the peripheral wall portion toward the inside.

As described in claim 6 , preferably, the plurality of flow path units are arranged in the vertical direction.
The ventilation holes are staggered in the flow direction of the second fluid.

According to the invention of claim 7, a flow path body unit having a plurality of cylindrical portions located parallel to each other and having a first fluid flowing inside the cylindrical portions and a second fluid flowing around the cylindrical portions. In a heat exchanger equipped with at least one
The flow path body unit is composed of a first plate material and a second plate material superposed on the first plate material.
The first plate material comprises a plurality of first half-cylinder portions having open facing surfaces and a plurality of first connecting portions provided between the plurality of first half-cylinder portions adjacent to each other. Have and
The second plate material is provided between a plurality of second half-cylinder portions facing the plurality of first half-cylinder portions and a plurality of second half-cylinder portions adjacent to each other. With a second connecting part of,
The plurality of first connecting portions and the plurality of second connecting portions are joined to each other to form a plurality of joined portions.
The plurality of first semi-cylindrical portions and the plurality of second semi-cylindrical portions constitute the plurality of cylindrical portions through which the first fluid flows.
A plurality of the flow path body units are arranged in the vertical direction with a gap between them.
Below the position where condensed water is generated from the second fluid, the plurality of joints of at least one of the flow path units have vent holes through which the second fluid can pass. The joint is provided with the joint and the joint without the vent hole.
Provided is a heat exchanger characterized in that the joint portion having no ventilation hole and the cylindrical portions on both sides of the joint portion constitute a receiving portion capable of receiving the condensed water. Will be done.

In the invention according to claim 1, the flow path body unit comprises a first plate material and a second plate material superposed on the first plate material. The first plate material has a plurality of first half-cylinder portions and a first connecting portion provided between them. The second plate material has a plurality of second half-cylinder portions and a second connecting portion provided between them. The first connecting portion and the second connecting portion are joined to each other to form a joint portion. The first half-cylinder portion and the second half-cylinder portion form a cylindrical portion through which the first fluid flows.

That is, a tubular portion is formed by providing a half-cylinder portion on each of the facing surfaces of the two plate materials and joining the connecting portions to each other. The flow path unit can be configured with only two plates without using pipes or connecting pipes. Therefore, the heat exchanger can be simply configured.

In addition, the flow path unit has a vent hole between the plurality of cylinders through which a second fluid can pass. A plurality of the flow path body units are arranged with a gap between them. Therefore, the edge of the ventilation hole becomes a fin for absorbing the heat of the second fluid as the second fluid passes through the ventilation hole. The cylinder and fins are integrally formed. Fins can be provided on the cylinder without increasing the number of parts.

In addition , at least one of the distances between the plurality of adjacent flow path unit units or the distances between the cylindrical portions on both sides of the ventilation hole is reduced from upstream to downstream of the second fluid. It is set. That is, the cylindrical portion is located so as to be coarse to dense from upstream to downstream.

If the distance between the flow path units or the distance between the cylindrical portions is increased, the ventilation resistance becomes smaller, but the efficiency of heat exchange tends to decrease. Reducing the spacing between them increases the efficiency of heat exchange, but tends to increase the ventilation resistance. In the present invention, the volume of the second fluid changes depending on the temperature, and on the upstream side of the high temperature, the interval is increased according to the second fluid having a large volume, and on the downstream side of the low temperature, the volume of the second fluid is small. By reducing the interval according to the above, it is possible to achieve both reduction of ventilation resistance and efficient heat exchange.

In the invention according to claim 2 , the first plate material has a first upright portion formed by the edges standing upright over the entire circumference. The second plate material has a second upright portion formed by the edges standing upright over the entire circumference. The first upright portion and the second upright portion are joined to each other to form a cylindrical portion and a peripheral wall portion surrounding the ventilation hole. Further, the peripheral wall portions of each of the plurality of flow path body units are joined to each other to form a wall surface portion. Therefore, a storage case for storing the flow path unit is not required, and the heat exchanger can be further simplified.

In the invention according to claim 4 , at least one of the first upright portion and the second upright portion constituting the peripheral wall portion has a groove portion with an open facing surface side. This groove constitutes a part of the gutter where the first fluid flows. That is, the gutter portion through which the first fluid flows is located at the edge of the flow path body unit. Since the peripheral wall portion is cooled by the first fluid, it is possible to suppress the temperature rise of the wall surface portion of the flow path body unit.

In the invention according to claim 6, the plurality of flow path body units are arranged in the vertical direction. The groove portion is provided in the lower plate material. The upper plate material has a lid portion that closes the groove portion. The lid portion is set to have a downward slope from the peripheral wall portion toward the inside. Therefore, even if condensed water is generated in the lid portion, the condensed water flows inward from the peripheral wall portion . It is possible to suppress the retention of condensed water on the edge of the flow path unit.

In the invention according to claim 6 , the plurality of flow path body units are arranged in the vertical direction. The plurality of ventilation holes are arranged in a staggered manner with respect to the flow direction of the second fluid. Therefore, the passing second fluid flows smoothly, and the ventilation pressure loss is reduced. Further, the condensed water dripping from the upper flow path unit does not pass through the ventilation holes of the lower flow path unit and hits the flow path unit. Since the condensed water is dropped while connecting each channel unit, the dropping speed can be reduced.

In the invention according to claim 7 , below the position where condensed water is generated from the second fluid, a plurality of joints of at least one channel unit are ventilated with a joint having a vent hole. It has a joint with no holes. The joint portion without a ventilation hole and the cylindrical portions on both sides of the joint portion form a receiving portion capable of receiving condensed water. The receiving portion that receives the condensed water is not provided as a separate body, but is configured as a part of the flow path body unit. That is, it is possible to construct a portion that receives condensed water without increasing the number of parts.

Further, the receiving portion is composed of a cylindrical portion through which the first fluid flows. Even if the temperature of the second fluid flowing around the receiving portion is high, the condensed water is cooled by the first fluid, so that the boiling of the condensed water can be suppressed.

FIG. 1A is a perspective view of a heat exchanger according to an embodiment of the present invention. FIG. 1B is an exploded perspective view of the heat exchanger shown in FIG. 1A. FIG. 2 is a sectional view taken along line 2-2 of FIG. 1 (a). It is a perspective view of the flow path body unit constituting the heat exchanger shown in FIG. 1 (b). 4 (a) is a cross-sectional view taken along the line 4 (a) -4 (a) of FIG. FIG. 4B is an enlarged view of an end portion of the flow path body unit shown in FIG. 4A. FIG. 5A is a perspective view of another flow path unit constituting the heat exchanger shown in FIG. 1B. 5 (b) is a sectional view taken along line bb of FIG. 5 (a). It is an operation diagram of an Example. It is a figure explaining the structure of the prior art.

Embodiments of the present invention will be described below with reference to the accompanying drawings. Up is up and Dn is down. Us indicates upstream and Ds indicates downstream.
<Example>

FIG. 1A shows a water heater 10 (heat exchanger 10) for heating water (first fluid) according to an embodiment of the present invention. The water heater 10 includes a burner 11 that generates a combustion gas (second fluid) and a stainless steel heat exchange unit 12 that is placed directly above the burner 11.

See FIG. 1 (b). The heat exchange unit 12 includes a main body portion 20 that exchanges heat between water and combustion gas, a base portion 13 that supports the main body portion 20, and a cover member 14 provided on the upper portion of the main body portion 20.

The base 13 has the shape of a frame, and the gas introduction port 13a into which the combustion gas is introduced, the first discharge pipe 15 into which the warmed water is discharged, and the condensed water generated from the combustion gas are described later. It has a second discharge pipe 16 to be discharged through the discharge holes 87a to 89a (FIG. 5a).

The cover member 14 has a gas exhaust port 14a from which the combustion gas that has passed through the main body 20 is exhausted, and a water introduction pipe 17 into which water is introduced.

See FIG. The main body portion 20 includes a plurality of (for example, nine) flow path body units 21 to 29, and a first spacer 31 and a second spacer 32 for adjusting the distance between these flow path body units 21 to 29. And have.

The main body is composed of nine flow path units 21 to 29 stacked one above the other. One unit in the lowermost layer is referred to as a first flow path unit 21. One unit in the layer above it is referred to as a second flow path unit 22. The four units in the layer above it are referred to as the third flow path unit units 23 to 26. The two units in the layer above it are referred to as the fourth flow path unit units 27 and 28. One unit on the uppermost layer is referred to as a fifth flow path unit 29.

A first spacer 31 is arranged between the first flow path body unit 21 and the second flow path body unit 22. Similarly, a second spacer 32 is arranged between the second flow path body unit 22 and the third flow path body unit 23.

In any of the units of the first flow path body unit 21 to the fifth flow path body unit 29, water flows inside the cylindrical portion described later, and combustion gas passes around the cylindrical portion. Hereinafter, the third flow path unit 23 will be described as an example.

See FIG. The third flow path unit 23 has five introduction holes 41 into which water can be introduced (see arrow 1), and six cylindrical portions in which one end side communicates with the introduction hole 41 and water passes through the inside (see arrow 2). It has 42 and five discharge holes 43 capable of communicating with the other end side of the cylindrical portion 42 and discharging water (see arrow 3).

Seven ventilation holes 44 through which combustion gas can pass (see arrow 4) are opened between the cylindrical portions 42 located parallel to each other and on the sides thereof.

The third flow path body unit 23 is composed of a first plate material 51 made of stainless steel and a second plate material 61 made of stainless steel superposed on the first plate material.

The introduction hole 41 is made in the second plate material 61. The discharge hole 43 is made in the first plate material 51. The cylindrical portion 42 is composed of a first plate material 51 and a second plate material 61. Hereinafter, it will be described in detail.

3 and 4 (a) are referred to. The first plate member 51 has seven first connecting portions provided between the six first half-cylinder portions 52 having the facing surface side open and the first half-cylinder portions 52 adjacent to each other and on the side thereof. It has 53 and.

Similarly, the second plate member 61 is located between the six second half-cylinder portions 62 facing the first half-cylinder portion 52 and the second half-cylinder portion 62 adjacent to each other and to the side thereof. It has seven second connecting portions 63 provided.

The seven first connecting portions 53 and the seven second connecting portions 63 are joined to each other to form seven joining portions 45. As a result, the first half-cylinder portion 52 and the second half-cylinder portion 62 constitute the above-mentioned six cylindrical portions 42. The ventilation hole 44 is formed in the joint portion 45.

The third flow path body units 23 to 26 have a left-right asymmetrical configuration with reference to the center line CL in the width direction (see FIG. 4A). Similarly, the fourth flow path unit units 27 and 28 also have a left-right asymmetrical configuration (see FIG. 2).

3 and 4 (b) are referred to. The first plate member 51 has a first upright portion 54 having an edge standing upward over the entire circumference. Similarly, the second plate member 61 has a second upright portion 64 configured by the edges standing upward over the entire circumference.

The inner peripheral surface 55 of the first upright portion 54 and the outer peripheral surface 65 of the second upright portion 64 are joined to each other. The first upright portion 54 and the second upright portion 64 joined to each other form a peripheral wall portion 23a surrounding the cylindrical portion 42 and the ventilation hole 44.

The first upright portion 54 has a groove portion 56 having a recess on the facing surface side. The groove 56 constitutes a part of the gutter 46 through which the water introduced from the introduction hole 41 flows. The groove portion 56 is provided in the lower first plate material 51. The upper second plate member 61 has a lid portion 66 that closes the groove portion 56. The lid portion 66 is set to have a downward slope from the peripheral wall portion 23a toward the inside (see arrow 5).

See FIGS. 2 and 3. The configuration of the third flow path unit 23 to 26 is the same as that of the third flow path unit 23. The third flow path units 23 to 26 are alternately laminated so that the introduction holes 41 and the discharge holes 43 communicate with each other. The third flow path unit 23 is located on the lower side, and the third flow path body unit 26 is located on the upper side. The peripheral wall portions 23a to 26a of the third flow path body unit face upward (downstream side of the combustion gas), respectively.

The configurations of the fourth flow path body units 27 and 28 and the fifth flow path body unit 29 are also substantially the same as those of the third flow path body units 23 to 26. That is, the fourth flow path unit 27 to the fifth flow path unit 29 are also made of two stacked plate materials, and the introduction hole 41 and the cylinder in the third flow path unit 23 to 26 are also formed. It has a portion corresponding to a portion 42, a discharge hole 43, and a gutter portion 46, but the positions and numbers thereof are different. Detailed explanation will be omitted.

The first spacer 31 is made of two plate materials. The first spacer 31 has a frame shape (not shown) and has a vent 33 and gutters 35 and 35. The second spacer 32 has the same configuration as the first spacer 31, and has a vent 34 and gutters 36, 36.

The first flow path unit 21 to the ninth flow path unit 29 have peripheral wall portions 21a to 29a, respectively. The first spacer 31 and the second spacer 32 have peripheral wall portions 31a and 32a, respectively. The peripheral wall portions 21a to 29a and the peripheral wall portions 31a and 32a are joined together by brazing to form a wall surface portion 20a which is an outer peripheral surface of the main body portion 20 (see FIG. 1).

See FIGS. 5 (a) and 5 (b). The basic configuration of the second flow path unit 22 is the same as that of the third flow path unit 23. The second flow path body unit 22 is composed of a first plate material 71 and a second plate material 72 superposed on the first plate material 71.

The second plate material 72 has 10 introduction holes 73 at the ends. The first plate material 71 is provided with a discharge hole (not shown). The second flow path body unit 22 has a first cylindrical portion 81 to a sixth cylindrical portion 86.

A first joint portion 91 to a seventh formed by joining a first plate material 71 and a second plate material 72 between the first cylindrical portion 81 to the sixth cylindrical portion 86 and on the side thereof. A joint 97 is provided.

The first joint portion 91, the third joint portion 93, the fifth joint portion 95, and the seventh joint portion 97 each have a first vent hole 74 to a fourth vent hole 77. The second joint portion 92, the fourth joint portion 94, and the sixth joint portion 96 do not have a ventilation hole because they have a function of receiving condensed water dripping from the upper layer.

The second joint portion 92, the first cylindrical portion 81 on both sides of the second joint portion 92, and the second cylindrical portion 82 can receive condensed water generated from the combustion gas. The receiving portion 87 of 1 is configured. The second joint portion 92 has a first discharge hole 87a for discharging the condensed water accumulated in the first receiving portion 87.

Similarly, the fourth joint portion 94, the third cylindrical portion 83, and the fourth cylindrical portion 84 constitute the second receiving portion 88. The fourth joint portion 94 has a second discharge hole 88a. The sixth joint portion 96, the fifth cylindrical portion 85, and the sixth cylindrical portion 86 constitute a third receiving portion 89. The sixth joint 96 has a third discharge hole 89a. The condensed water that has passed through the first discharge hole 87a to the third discharge hole 89a is dropped onto the upper surface groove portion of the first flow path unit 21 (FIG. 2) in the lowermost layer, collected in one place, and is collected in a second place. Is discharged from the discharge pipe 16 (FIG. 1 (b)).

Like the second flow path unit 22, the first flow path unit 21 in the lowermost layer also has four receiving portions 21c having the same configuration as the above receiving portions 87 to 89 (see FIG. 2).

The receiving portion for receiving the condensed water can be appropriately provided in each flow path unit as needed. That is, a receiving portion is appropriately provided in the flow path body unit below the position where condensed water is generated. In order to reliably receive the condensed water dripping downward, it is preferable to provide a receiving portion in the first flow path unit 21 of the lowermost layer as in this embodiment.

See FIG. The distance between the first flow path unit 21 and the second flow path unit 22 is defined as D1. The distance between the third flow path unit 23 and the third flow path unit 24 is defined as D2. The distance between the fourth flow path unit 28 and the fifth flow path unit 29 is defined as D3. The relationship between D1 and D3 is D1>D2> D3.
That is, the distance D between the first flow path unit 21 to the fifth flow path unit 29 is set to decrease from the upstream side to the downstream side of the combustion gas.

Let d1 be the distance between the fourth cylindrical portion 84 and the fifth cylindrical portion 85 of the second flow path body unit 22. The distance between the cylindrical portions 42 and 42 of the third flow path unit 23 is d2, and the distance between the cylindrical portions 99 and 99 of the fifth flow path unit is d3. The magnitudes of d1 to d3 are d1> d2> d3. That is, the distance d between the cylindrical portions is set to decrease from the upstream to the downstream of the combustion gas. Therefore, the sizes of the ventilation holes 21b, ... 44 ..., 29b formed between the cylindrical portions also become smaller from the upstream to the downstream of the combustion gas.

In addition, the ventilation holes 21b of the first flow path unit 21 to the ventilation holes 29b of the fifth flow path unit 29 are located in a staggered manner with respect to the flow direction of the combustion gas.

Next, the effect of the embodiment will be described.

3 and 4 (a) are referred to. The third flow path body unit 23 includes a first plate material 51 and a second plate material 61 superposed on the first plate material 51. The first plate member 51 has six first half-cylinder portions 52 and seven first connecting portions 53 provided between them and laterally thereof. Similarly, the second plate member 61 has six second half-cylinder portions 62 and seven second connecting portions 63. The first connecting portion 53 and the second connecting portion 63 are joined to each other to form a joining portion 45. As a result, the first half-cylinder portion 52 and the second half-cylinder portion 62 form a cylindrical portion 42.

That is, the third flow path unit 23 can be configured only with the first plate material 51 and the second plate material 61 without using pipes or connecting pipes. The configuration of the other flow path unit is the same. Therefore, the heat exchanger 10 can be simply configured.

The inner peripheral surface 42a of the cylindrical portion 42 has a substantially circular shape. Therefore, the pressure of water passing through the inside of the cylindrical portion 42 is evenly dispersed.

3 and 4 (b) are referred to. The third flow path unit 23 has seven ventilation holes 44 through which combustion gas can pass, between the cylindrical portions 42 and laterally. The edges 47, 47 of the ventilation holes 44 are fins 47, 47 for absorbing the heat of the combustion gas when the combustion gas passes through the ventilation holes 44. The cylindrical portion 42 and the fin 47 are integrally formed. Fins 47 and 47 can be provided on the cylindrical portion 42 without increasing the number of parts.

In addition, the first plate member 51 has a first upright portion 54. The second plate member 61 has a second upright portion 64. The first upright portion 54 and the second upright portion 64 form a peripheral wall portion 23a that surrounds the cylindrical portion 42 and the ventilation hole 44. The peripheral wall portions 21a to 29a and the peripheral wall portions 31a and 32a (FIG. 2) similarly configured in the other flow path body units 21, 22, 24 to 29 are joined at once by brazing, and the main body portion 20 (FIG. 1). Refer to), it constitutes a wall surface portion 20a which is an outer peripheral surface. Therefore, a storage case for accommodating the first flow path unit 21 to the fifth flow path unit 29 becomes unnecessary, and the heat exchanger 10 can be further simplified.

In addition, the first upright portion 54 has a groove portion 56 having a recess on the facing surface side. The groove 56 constitutes a part of the gutter 46 through which water flows. That is, the gutter portion 46 through which water flows is located at the edge of the third flow path unit 23. The peripheral wall portion 23a is cooled by water. The other flow path units 21, 22, 24 to 29 have the same configuration. As a result, it is possible to suppress the temperature rise of the wall surface portion 20a of the main body portion 20.

In addition, the groove 56 is provided in the lower first plate 51. The upper second plate member 61 has a lid portion 66 that closes the groove portion 56. The lid portion 66 is set to have a downward slope from the peripheral wall portion 23a toward the inside. Therefore, even if condensed water is generated in the lid portion 66, the condensed water flows down from the peripheral wall portion 23a inward and downward (see arrow 5). It is possible to suppress the retention of condensed water on the edge of the third flow path unit 23.

See FIG. The distance D between the first flow path unit 21 to the fifth flow path unit 29 is set to decrease from the upstream side to the downstream side of the combustion gas (D1> D2> D3). Further, the distance d between the cylindrical portions in the first flow path unit 21 to the fifth flow path unit 29 is set to become smaller from the upstream side to the downstream side of the combustion gas ( d1> d2> d3).

That is, the cylindrical portion is located so as to be coarse to dense from the upstream to the downstream of the combustion gas. Therefore, as shown by the arrows (6) to (8), the volume decreases due to the decrease in the temperature of the combustion gas from the upstream to the downstream, so that the influence on the ventilation resistance is small.

If the intervals D and d are set large, the ventilation resistance is small, but the efficiency of heat exchange is low. When the intervals D and d are set small, the efficiency of heat exchange increases, but the ventilation resistance increases. In this embodiment, the intervals D and d become smaller from the upstream to the downstream. Therefore, the ventilation resistance can be lowered on the upstream side of the high temperature, and the efficiency of heat exchange can be improved on the downstream side of the low temperature. As a result, it is possible to achieve both reduction of ventilation resistance and efficient heat exchange.

The ventilation holes 21b of the first flow path unit and the ventilation holes 29b of the fifth flow path unit are located in a staggered manner with respect to the flow direction of the second fluid. Therefore, the condensed water dripping from the upper channel unit does not pass through the ventilation holes of the lower channel unit and hits the lower channel unit. Since the condensed water is dropped while connecting the flow path unit of each layer, the dropping speed can be reduced.

In particular, the third flow path unit 23 has a left-right asymmetrical configuration with respect to the center line CL in the width direction (see FIG. 3A). Therefore, the ventilation holes 44 can be positioned in a staggered manner only by alternately stacking the third flow path units 23 to 26. The fourth flow path unit 27, 28 has the same configuration. The explanation is omitted.

5 (a), 5 (b), and 6 are referred to. The second joint portion 92 having no ventilation holes, and the first cylindrical portion 81 and the second cylindrical portion 82 on both sides of the second joint portion 92 receive condensed water generated from the combustion gas. It constitutes a first receiving portion 87 which is possible (see arrow (9)). That is, the receiving portion that receives the condensed water is not provided as a separate body, but is configured as a part of the second flow path body unit 22. That is, since the portion that receives the condensed water can be configured without increasing the number of parts, the heat exchanger 10 can be simply configured.

Further, the first receiving portion 87 is composed of a first cylindrical portion 81 through which water flows inside and a second cylindrical portion 82. Even if the combustion gas flowing around the first receiving portion 87 has a high temperature, the condensed water is cooled by the water, so that the boiling of the condensed water can be suppressed. The second receiving portion 88 and the third receiving portion 88 also have the same effect.

As described above, the first flow path unit 21 to the fifth flow path unit 29 are made of a stainless steel plate. Conventional heat exchangers are composed of primary and secondary heat exchangers, which are made of different materials and are separate bodies. On the other hand, the heat exchanger 10 of the present invention is integrated by simple flow path units 21 to 29 made of stainless steel. The manufacturing cost of the heat exchanger 10 can be suppressed. Further, since the heat exchanger 10 is made of stainless steel, it also has corrosion resistance to acidic condensed water.

In this embodiment, the first flow path unit 21 is arranged so as to be the lowest layer, but for example, the first flow path body unit 21 is arranged so as to be the uppermost layer, and the first The combustion gas may be flown from the flow path body unit 21 to the fifth flow path body unit 29. Further, the first to fifth flow path units 21 to 29 may be arranged in the horizontal direction. The number of flow path units and the presence / absence of a condensed water receiving portion mechanism can be appropriately changed depending on the application.

Further, in this embodiment, the first fluid is water, and the cylindrical portion preferably has a circular shape that can withstand high water pressure. The shape of the cylindrical portion can be appropriately changed according to the pressure of the first fluid flowing inside the cylindrical portion. The cylindrical portion may have a substantially cylindrical shape, may include a flat cylindrical shape, and may have a flat surface or a corner portion at at least one place.

The present invention is not limited to the examples as long as it exerts an action and an effect.

The heat exchanger of the present invention is suitable for a water heater used at home.

10 ... Water heater (heat exchanger)
12 ... Heat exchange section 20 ... Main body section 20a ... Wall surface section 21-29 ... First flow path body unit-Ninth flow path body unit 21a-29a ... Peripheral wall section 31 ... First spacer 32 ... Second spacer 33 ... Ventilation port 34 ... Ventilation port 35 ... Side groove 36 ... Side groove 41 ... Introduction hole 42 ... Cylindrical part 43 ... Discharge hole 44 ... Ventilation hole 45 ... Joint part 46 ... Side groove part 47 ... Edge (fin)
51 ... 1st plate 52 ... 1st half-cylinder 53 ... 1st connecting portion 54 ... 1st upright portion 55 ... Inner peripheral surface 56 ... Groove 61 ... 2nd plate 62 ... 2nd half-cylinder 63 ... Second connecting portion 64 ... Second standing portion 65 ... Outer peripheral surface 66 ... Lid portion 71 ... First plate material 72 ... Second plate material 73 ... Introduction holes 74 to 77 ... First ventilation holes to fourth Vent holes 81 to 86 ... 1st cylindrical portion to 6th cylindrical portion 87 to 89 ... 1st receiving portion to 3rd receiving portion 87a to 89a ... 1st discharge hole to 3rd discharge hole 91 to 97 ... 1st joint to 7th joint 99 ... Cylindrical part

Claims (7)

In a heat exchanger having a plurality of cylindrical portions located parallel to each other and having at least one flow path unit in which a first fluid flows inside the cylindrical portions and a second fluid flows around the cylindrical portions.
The flow path body unit is composed of a first plate material and a second plate material superposed on the first plate material.
The first plate material comprises a plurality of first half-cylinder portions having open facing surfaces and a plurality of first connecting portions provided between the plurality of first half-cylinder portions adjacent to each other. Have and
The second plate material is provided between a plurality of second half-cylinder portions facing the plurality of first half-cylinder portions and a plurality of second half-cylinder portions adjacent to each other. With a second connecting part of,
The plurality of first connecting portions and the plurality of second connecting portions are joined to each other to form a plurality of joined portions.
The plurality of first semi-cylindrical portions and the plurality of second semi-cylindrical portions constitute the plurality of cylindrical portions through which the first fluid flows.
The plurality of joints have ventilation holes through which the second fluid can pass.
A plurality of the flow path body units having the ventilation holes are arranged with a gap between them.
At least one of the distances between the plurality of adjacent flow path unit units or the distances between the cylindrical portions on both sides of the ventilation hole is reduced from upstream to downstream of the second fluid. A heat exchanger characterized by being set. In a heat exchanger having a plurality of cylindrical portions located parallel to each other and having at least one flow path unit in which a first fluid flows inside the cylindrical portions and a second fluid flows around the cylindrical portions.
The flow path body unit is composed of a first plate material and a second plate material superposed on the first plate material.
The first plate material comprises a plurality of first half-cylinder portions having open facing surfaces and a plurality of first connecting portions provided between the plurality of first half-cylinder portions adjacent to each other. Have and
The second plate material is provided between a plurality of second half-cylinder portions facing the plurality of first half-cylinder portions and a plurality of second half-cylinder portions adjacent to each other. With a second connecting part of,
The plurality of first connecting portions and the plurality of second connecting portions are joined to each other to form a plurality of joined portions.
The plurality of first semi-cylindrical portions and the plurality of second semi-cylindrical portions constitute the plurality of cylindrical portions through which the first fluid flows.
The plurality of joints have ventilation holes through which the second fluid can pass.
A plurality of the flow path body units having the ventilation holes are arranged with a gap between them.
The first plate material has a first upright portion having an edge upright over the entire circumference, and the second plate material has a first upright portion having an edge upright over the entire circumference. It has 2 standing parts and
The first upright portion and the second upright portion are joined to each other to form a plurality of cylindrical portions and a peripheral wall portion surrounding the plurality of ventilation holes.
The peripheral wall portions of each of the plurality of flow path body units are joined to each other to form a wall surface portion that serves as an outer peripheral surface of the plurality of flow path body units.
At least one of the first upright portion and the second upright portion constituting the peripheral wall portion has a groove portion with an open facing surface side, and this groove portion constitutes a part of a gutter portion through which the first fluid flows. A heat exchanger characterized by being a gutter. The first plate material has a first upright portion having an edge upright over the entire circumference, and the second plate material has a first upright portion having an edge upright over the entire circumference. It has 2 standing parts and
The first upright portion and the second upright portion are joined to each other to form a plurality of cylindrical portions and a peripheral wall portion surrounding the plurality of ventilation holes.
Claim 1 is characterized in that the peripheral wall portions of each of the plurality of flow path body units are joined to each other to form a wall surface portion which is an outer peripheral surface of the plurality of flow path body units. The heat exchanger described in. At least one of the first upright portion and the second upright portion constituting the peripheral wall portion has a groove portion with an open facing surface side.
The heat exchanger according to claim 3, wherein the groove portion constitutes a part of a side groove portion through which the first fluid flows. The plurality of flow path units are arranged in the vertical direction, and the plurality of flow path units are arranged in the vertical direction.
The groove portion is provided in the lower plate material, and the groove portion is provided in the lower plate material.
2 . The heat exchanger described. The plurality of flow path units are arranged in the vertical direction, and the plurality of flow path units are arranged in the vertical direction.
The heat exchanger according to any one of claims 1 to 5, wherein the ventilation holes are arranged in a staggered manner with respect to the flow direction of the second fluid. In a heat exchanger having a plurality of cylindrical portions located parallel to each other and having at least one flow path unit in which a first fluid flows inside the cylindrical portions and a second fluid flows around the cylindrical portions.
The flow path body unit is composed of a first plate material and a second plate material superposed on the first plate material.
The first plate material comprises a plurality of first half-cylinder portions having open facing surfaces and a plurality of first connecting portions provided between the plurality of first half-cylinder portions adjacent to each other. Have and
The second plate material is provided between a plurality of second half-cylinder portions facing the plurality of first half-cylinder portions and a plurality of second half-cylinder portions adjacent to each other. With a second connecting part of,
The plurality of first connecting portions and the plurality of second connecting portions are joined to each other to form a plurality of joined portions.
The plurality of first semi-cylindrical portions and the plurality of second semi-cylindrical portions constitute the plurality of cylindrical portions through which the first fluid flows.
A plurality of the flow path body units are arranged in the vertical direction with a gap between them.
Below the position where condensed water is generated from the second fluid, the plurality of joints of at least one of the flow path units have vent holes through which the second fluid can pass. The joint is provided with the joint and the joint without the vent hole.
A heat exchanger characterized in that the joint portion having no ventilation hole and the cylindrical portions on both sides of the joint portion form a receiving portion capable of receiving the condensed water.

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