JPH08159681A - Heat exchanger - Google Patents

Abstract

PURPOSE: To improve heat efficiency in a heat exchanger by recovering more heat from a heat exchanging fluid flowing in the vicinity of the middle between heat transfer plates. CONSTITUTION: A heat exchanger is adapted such that heat transfer plates 6, 7 through which a heat exchanging fluid of a second kind flows are disposed in a flow passage 5 through which a heat exchanging fluid of a first kind flows, in the flow direction of the heat exchanging fluid of a first kind upstream and downstream the flow, and pluralities of heat transfer plates 11, 13 are fixed to the upstream heat transfer pipe 6 and the downstream heat transfer plate 7 in the direction of the flow of the heat exchanging fluid of a first kind. In the heat exchanger, there are separately constructed the upstream heat transfer plate 11 fixed to the upstream heat transfer pipe 6 and the downstream heat transfer plate 13 fixed to the downstream heat transfer pipe 7. The upstream heat transfer plate 11 and the downstream heat transfer plate 13 are disposed, displaced in their positions perpendicularly to the direction of the flow of the heat exchanging fluid of a first kind.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger used in various heat exchange devices such as a gas combustion type hot water supply device and a cooling device. More specifically, a heat transfer tube through which the second type heat exchange fluid flows is provided in the flow path of the first type heat exchange fluid along the flow direction of the first type heat exchange fluid. Side and lower side, and a plurality of heat transfer plates along the flow direction of the first heat exchange fluid are fixed to the upper heat transfer tube on the upper side and the lower heat transfer tube on the lower side. It is related to the existing heat exchanger.

[0002]

2. Description of the Related Art In a heat exchanger of this type, conventionally, as disclosed in, for example, Japanese Utility Model Laid-Open No. 3-38580, the same heat transfer plate is fixed to the upper heat transfer tube and the lower heat transfer tube. It was general that the heat transfer plates were formed from the plate-like body and a plurality of heat transfer plates formed from the plate-like body were arranged along the flow direction of the combustion gas that is the first type heat exchange fluid.

[0003]

In this conventional heat exchanger, as shown in FIG. 7, the combustion gas flows between the heat transfer plates 15 and the heat transfer plates 15 and the heat transfer tubes are connected between them. Heat is exchanged through the heat transfer tubes 6, and the water flowing through the upper heat transfer tube 6 and the lower heat transfer tube 7 is heated. However, since each heat transfer plate 15 is composed of one plate-shaped body from the upper heat transfer pipe 6 to the lower heat transfer pipe 7, the combustion gas flows relatively smoothly, and particularly The combustion gas flowing near the center of the heat transfer plate 15, that is, near the center of the heat transfer plate 15, flows in a state close to a laminar flow rather than a turbulent flow. The heat was exhausted to the outside of the heat exchanger without sufficiently transmitting the heat to the heat transfer plate 15 and the heat transfer tubes 6 and 7, which was one of the causes of the decrease in thermal efficiency.

The present invention focuses on such a conventional problem, and its purpose is to flow a portion of the first type heat exchange fluid such as combustion gas away from the surface of the heat transfer plate. The aim is to allow more heat to be recovered from the heat exchange fluid, thereby improving thermal efficiency.

[0005]

In order to achieve this object, the first characteristic configuration of the heat exchanger according to the present invention is the second type heat exchange in the flow path through which the first type heat exchange fluid flows. The heat transfer tubes through which the working fluid flows are arranged on the upper side and the lower side in the flow direction along the flow direction of the first type heat exchange fluid, and the heat transfer tubes on the upper side and the lower side in the flowing direction A heat exchanger in which a plurality of heat transfer plates along the flow direction of the first type heat exchange fluid are fixed to the lower heat transfer pipe, the upper heat transfer plate being fixed to the upper heat transfer pipe, , The lower heat transfer plate fixed to the lower heat transfer tube is configured as a separate body, and these upper heat transfer plate and lower heat transfer plate are orthogonal to the flow direction of the first type heat exchange fluid. The point is that they are arranged at different positions in different directions.

In the second characteristic configuration, a plurality of upper heat transfer tubes and a plurality of lower heat transfer tubes are arranged at different positions in a direction orthogonal to the flow direction of the first type heat exchange fluid. , The plurality of upper heat transfer tubes and the lower heat transfer tubes are arranged at different positions in a direction orthogonal to the flow direction of the first type heat exchange fluid, and the plurality of upper heat transfer tubes are arranged. The upper heat transfer plate is integrally formed with the lower heat transfer plate, and the lower heat transfer plate is integrally formed with the plurality of lower heat transfer tubes.

A third characteristic configuration is that the lower side portion of the upper heat transfer plate and the upper side portion of the lower heat transfer plate are arranged so as to overlap each other in the flow direction of the first type heat exchange fluid. There is a point.

In a fourth characteristic structure, a plurality of upper heat transfer plates are fixed to the upper heat transfer tube at substantially equal intervals, and a plurality of lower heat transfer plates are equally spaced at the lower heat transfer tube. The point is that it is stuck to.

A fifth characteristic configuration is that the first-type heat exchange fluid is combustion gas from a gas burner, and the second-type heat exchange fluid is hot and cold water for supplying water to a hot water supply pipe. A flow path of the combustion gas is formed from the lower side to the upper side in a cylinder having a gas burner, and the upper heat transfer pipe and the lower heat transfer pipe are provided on the upper part of the cylinder, and the upper heat transfer pipe is moved downward to the lower hand. The point is that the heat transfer tubes are arranged upward.

[0010]

According to the first characteristic configuration of the present invention, in the heat exchanger described above, the upper heat transfer plate fixed to the upper heat transfer pipe and the lower heat transfer plate fixed to the lower heat transfer pipe are provided. Since the upper heat transfer plate and the lower heat transfer plate are arranged separately and are arranged at different positions in the direction orthogonal to the flow direction of the first type heat exchange fluid, While flowing between the side heat transfer plates, the upper heat transfer plate or the upper heat transfer tube recovers heat from the first-type heat exchange fluid. Then, for the type I heat exchange fluid that flows in a location away from the surface of the upper heat transfer plate and the heat recovery is not sufficient, the lower heat transfer in which the position is different in the direction orthogonal to the flow direction A turbulent flow is generated by colliding with the edge of the plate, and the heat is recovered by the lower heat transfer plate and the lower heat transfer tube, which improves the thermal efficiency as a whole.

According to the second characteristic configuration, since a plurality of upper heat transfer tubes and a plurality of lower heat transfer tubes are respectively provided,
Not only the heat efficiency is further improved, but also the plurality of upper heat transfer tubes and the lower heat transfer tubes are arranged at different positions in the direction orthogonal to the flow direction of the first type heat exchange fluid. Therefore, the number of opportunities for the first-type heat exchange fluid to come into contact with both heat transfer tubes and the heat transfer plate fixed to the heat transfer tubes is increased, and thermal efficiency is further improved. However, since the upper heat transfer plates that are integrally formed are fixed to the plurality of upper heat transfer pipes, and the lower heat transfer plates that are integrally formed are fixed to the plurality of lower heat transfer pipes, respectively. Compared to the case where a separate upper heat transfer plate or lower heat transfer plate is attached to each side heat transfer pipe or lower heat transfer pipe, manufacturing is easier and the transfer of each upper side or lower side is easier. The hot plate can also be expected to hold the position of the heat transfer tube on the upper side or the lower side.

According to the third characteristic configuration, the lower side portion of the upper heat transfer plate and the upper side portion of the lower heat transfer plate are arranged so as to overlap each other in the flowing direction of the first heat exchange fluid. Therefore, without increasing the size of the heat exchanger itself, it is possible to increase the heat efficiency by increasing the area of the upper heat transfer plate or the lower heat transfer plate, and at the part where both heat transfer plates overlap, Since the flow velocity of the heat exchange fluid becomes faster, the turbulent flow generated by colliding with the edge of the lower heat transfer plate becomes more intense, and the heat recovery by this lower heat transfer plate and lower heat transfer tube is further improved. To do.

According to the fourth characteristic configuration, a plurality of upper heat transfer plates are fixed to the upper heat transfer pipe at substantially equal intervals, and a plurality of lower heat transfer plates are substantially equidistant to the lower heat transfer pipe. The heat recovery from the upper heat transfer plate and the lower heat transfer plate from the first heat exchange fluid can be averaged in the axial direction of both heat transfer tubes. It is possible to uniformly recover heat from the seed heat exchange fluid.

According to the fifth characteristic configuration, the first-type heat exchange fluid is combustion gas from the gas burner, and the second-type heat exchange fluid is hot and cold water for supplying water to the hot water supply pipe. A flow path of combustion gas is formed from the lower side to the upper side in a cylinder body having a gas burner, and an upper heat transfer tube and a lower heat transfer tube are formed in an upper portion of the cylinder body, and a lower heat transfer tube is arranged in a lower heat transfer tube. Since it is arranged above, the gas combustion type hot water supply device having such a configuration can improve the thermal efficiency without enlarging the heat exchanger itself as described above. , Especially in the vertical direction,
Moreover, a high-performance water heater can be provided.

[0015]

As described above in detail, according to the first characteristic configuration of the present invention, while the first type heat exchange fluid flows between the upper heat transfer plates, the upper heat transfer plates are provided. And the heat transfer tube on the upper hand side recover heat, and the heat transfer plate on the lower hand side and the heat transfer tube on the lower hand side heat the first type heat exchange fluid that has flowed away from the surface of the upper heat transfer plate. Therefore, the thermal efficiency can be improved as a whole.

According to the second characteristic configuration, a plurality of upper heat transfer tubes and lower heat transfer tubes are provided, and these upper heat transfer tubes and lower heat transfer tubes are arranged in the flow direction of the first type heat exchange fluid. By changing the position in the orthogonal direction, it is possible to further improve the thermal efficiency, and furthermore, by integrally fixing the heat transfer plates to both of these heat transfer tubes, manufacturing is easy. In addition, the heat transfer tubes can be expected to have the function of holding the position of the heat transfer tubes.

According to the third characteristic configuration, the lower side portion of the upper heat transfer plate and the upper portion of the lower heat transfer plate are overlapped with each other, so that each heat transfer can be performed without enlarging the heat exchanger itself. The area of the heat plate can be increased to improve the thermal efficiency, and particularly, the heat recovery by the lower heat transfer plate or the lower heat transfer tube can be further improved to further improve the heat efficiency.

According to the fourth characteristic configuration, heat can be recovered from the first-type heat exchange fluid evenly, and also from this point, the thermal efficiency can be improved.

According to the fifth characteristic construction, it is possible to provide a gas combustion type hot water supply apparatus which is compact in the vertical direction and has high performance.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the heat exchanger according to the present invention is applied to a gas combustion type hot water supply apparatus will be described with reference to the drawings.

FIG. 1 and FIG. 2 show the outline of the whole hot water supply apparatus, in which a barrel 2 is arranged inside the outer casing 1, and in the lower portion inside the barrel 2, a heat exchange fluid of the first type. A gas burner 3 for generating combustion gas is disposed.
A fan 4 for supplying combustion air is communicatively connected to the lower portion of the barrel 2 so that the combustion gas from the burner 3 flows from below to above along a combustion gas passage 5 formed in the barrel 2. It is configured to flow. Inside the combustion gas flow path 5 in the upper inside of the barrel 2, there are an upper heat transfer tube 6 and a lower heat transfer tube 7, which will be described later in detail, with the upper heat transfer tube 6 being downward and the lower heat transfer tube 7 being upward. And a water supply pipe 8 spirally wound around the outer periphery of the barrel 2 are connected to the upper heat transfer pipe 6 and a lower water transfer pipe 7 is connected to the hot water supply pipe 9. Has been done.

The upper heat transfer tubes 6 are three in total, and are arranged in parallel at different positions in the direction orthogonal to the flow direction of the combustion gas and through the barrel 2. The water supply pipe 8 and the water supply pipe 8 were connected to one of the three heat transfer pipes 6 on the upper hand side, which is located at the end, on the lateral outside of the barrel 2. The upper heat transfer tube 6 and the upper heat transfer tube 6 located in the center are provided on the other lateral outside of the barrel 2, and the upper heat transfer tube 6 in the center and the remaining upper heat transfer tube 6 are water supply pipes. On the lateral outer side of the cylinder body 2 on the side to which 8 is connected, they are connected by a U-shaped connecting pipe 10.

The lower heat transfer tubes 7 are two in total, and like the upper heat transfer tubes 6, the positions are different in the direction orthogonal to the flow direction of the combustion gas, and the heat transfer tubes 7 are arranged side by side through the barrel 2. Has been done. Further, these two lower heat transfer tubes 7 are arranged in parallel in a direction parallel to the upper heat transfer tubes 6 and in a direction orthogonal to the flow direction of the combustion gas with respect to the three upper heat transfer tubes 6. Are arranged in zigzag at different positions.

Then, one of the two heat transfer tubes 7 on the lower side and the remaining heat transfer tube 6 on the other side located at the end are connected by a U-shaped connecting pipe 10 on the lateral outside of the barrel 2. On the other lateral outside of the barrel 2, the lower heat transfer pipe 7 connected to the upper heat transfer pipe 6 and the remaining lower heat transfer pipe 7 are connected and connected by the connecting pipe 10, and the remaining lower heat transfer pipe is connected. The hot water supply pipe 9 is connected to the heat transfer pipe 7. Therefore, the water as the second type heat exchange fluid supplied from the water supply pipe 8 is
First, the three heat transfer pipes 6 on the upper side are meandered to be heated, and the two heat transfer pipes 7 on the lower side are meandered to be heated to be heated. It is configured to be supplied to a hot water supply plug or the like (not shown) via 9.

The upper heat transfer tube 6 is provided on the upper heat transfer tube 6.
1 is fixed, this upper heat transfer plate 11
Is integrally formed from one plate-shaped body, and it is integrally fixed to the three upper heat transfer tubes 6. That is, as shown in FIG. 4, one upper heat transfer plate 11 is
A total of three bosses 12 forming through-holes through which the three heat-side heat transfer tubes 6 penetrate are integrally formed, and in each of the bosses 12 with the heat-side heat transfer tubes 6 inserted therein, each heat-side heat transfer tube 6 is inserted. And the boss 12 of the upper heat transfer plate 11 are fixed to each other by brazing. Then, a plurality of such good heat transfer plates 11 are fixed along the axial direction of the three good heat transfer tubes 6, and each boss 12 of the good heat transfer plates 11 functions to maintain a gap. As a result, a plurality of upper heat transfer plates 11 are fixed to the upper heat transfer tube 6 at substantially equal intervals.

The lower heat transfer plate 1 is attached to the lower heat transfer tube 7.
3, the lower heat transfer plate 13 is completely separate from the upper heat transfer plate 11. This lower heat transfer plate 13 is also integrally formed from one plate-like body like the upper heat transfer plate 11, and is integrally fixed to the two lower heat transfer tubes 7 by brazing. . Therefore, a total of two bosses 14 for forming through holes through which the lower heat transfer tube 7 penetrates are integrally formed in the lower heat transfer 13, and such lower heat transfer plate 13 is formed into two pieces. A plurality of lower heat transfer tubes 7 are fixed along the axial direction. Also in the lower heat transfer plate 13, the bosses 14 function to maintain a space, and the boss 14 of the lower heat transfer plate 13 and the boss 12 of the upper heat transfer plate 11 are formed to have substantially the same length. As a result, a plurality of lower heat transfer plates 13 are fixed to the lower heat transfer tube 7 at substantially the same intervals as the upper heat transfer plates 11 and at equal intervals.

As shown in FIG. 3, the upper heat transfer plate 11 and the lower heat transfer plate 13 are different in position in the direction orthogonal to the flow direction of the combustion gas, and are adjacent to each other. The lower heat transfer plates 13 are arranged in a staggered manner so that each lower heat transfer plate 13 is located at the center of the upper heat transfer plate 11. That is, if the distance between the upper heat transfer plates 11 is L, the distance between the lower heat transfer plates 13 is also L, and the distance between the adjacent upper heat transfer plates 11 and the lower heat transfer plates 13 is L / 2. Are arranged in a staggered manner.
Further, the lengths of both heat transfer plates 11 and 13 in the vertical direction are formed to be long enough to overlap with each other, and
The lower side portion and the upper side portion of the lower heat transfer plate 13 are arranged so as to overlap each other in the flow direction of the combustion gas.

[Other Embodiments] In the previous embodiment, the upper heat transfer tube 6 and the lower heat transfer tube 7 are shown arranged in two stages, upper and lower, but they are arranged in three or more stages. You can also do it. 5 and 6 show an embodiment in which the heat transfer plates 11 and 13 are arranged in three stages, and when the distance between the heat transfer plates 11 and 13 is L, the one shown in FIG. The distance from the plate 13 is L
6 is an embodiment in which the distance between the upper heat transfer plate 11 and the lower heat transfer plate 13 adjacent to each other is L / 2. Is shown. When the upper heat transfer tubes 6 and the lower heat transfer tubes 7 are arranged in three stages or more as described above, the upper heat transfer tubes 6 adjacent to each other are arranged.
The present invention can be implemented between the lower heat transfer tube 7 and the heat transfer plates 11 and 13 fixed to both heat transfer tubes 6 and 7.

The numbers of the upper heat transfer tubes 6 and the lower heat transfer tubes 7 can be freely changed according to the size of the heat exchanger. Further, when a plurality of upper heat transfer tubes 6 are arranged, it is always necessary to integrally fix the upper heat transfer plate 11 formed of one plate-like member to the plurality of upper heat transfer tubes 6. Alternatively, the upper heat transfer plates 11 formed separately for the respective upper heat transfer tubes 6 can be fixed to each other, and the same can be applied to the lower heat transfer tubes 7. Also, the lower heat transfer plate 11 and the lower heat transfer plate 13
Although an example in which the upper side portion and the upper hand side portion are arranged so as to be overlapped with each other in the flow direction of the first type heat exchange fluid is shown, it is not always necessary to overlap.

The heat exchanger according to the present invention described above can be used as a heat exchanger for various devices such as a cooling device and a refrigerating device, in addition to being used for a gas combustion type hot water supply device as in the above embodiments. You can also

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a schematic view showing the entire gas combustion type hot water supply device.

FIG. 2 is a partially cutaway perspective view showing an entire gas combustion type hot water supply device.

FIG. 3 is a cross-sectional view of a heat exchanger

FIG. 4 is a perspective view of a heat transfer plate.

FIG. 5 is a sectional view of a heat exchanger showing another embodiment.

FIG. 6 is a sectional view of a heat exchanger showing another embodiment.

FIG. 7 is a sectional view of a conventional heat exchanger.

[Explanation of symbols]

 2 Cylinder 3 Gas burner 5 Flow path of combustion gas as first type heat exchange fluid 6 Upper heat transfer pipe 7 Lower heat transfer pipe 9 Hot water supply pipe 11 Upper heat transfer plate 13 Lower heat transfer plate

Claims (5)

[Claims] 1. Heat transfer pipes (6), (7) through which a second type heat exchange fluid flows are provided in a flow path (5) through which a first type heat exchange fluid flows, said first type heat exchange. The first heat transfer pipe (6) and the lower heat transfer pipe (7) on the lower side in the flow direction are arranged on the upper side and the lower side in the flowing direction. A heat exchanger having a plurality of heat transfer plates (11), (13) fixed along a flow direction of a seed heat exchange fluid, the heat transfer plate being fixed to the heat transfer pipe (6). (1
1) and the lower heat transfer plate (13) fixed to the lower heat transfer tube (7) are separately configured, and these upper heat transfer plates (1)
A heat exchanger in which 1) and the lower heat transfer plate (13) are arranged at different positions in a direction orthogonal to the flow direction of the first type heat exchange fluid. 2. A plurality of the upper heat transfer tubes (6) and a plurality of lower heat transfer tubes (7) are arranged at different positions in a direction orthogonal to the flow direction of the first type heat exchange fluid. Is
The plurality of upper heat transfer tubes (6) and the lower heat transfer tubes (7) are arranged at different positions in the direction orthogonal to the flow direction of the first type heat exchange fluid, and the plurality of heat transfer tubes (6) are arranged. An upper heat transfer plate (11) integrally formed is fixed to the upper heat transfer pipe (6), and an integrally formed lower heat transfer plate (13) is fixed to a plurality of lower heat transfer pipes (7). The heat exchanger according to claim 1, wherein 3. The lower side portion of the upper heat transfer plate (11) and the upper side portion of the lower heat transfer plate (13) are arranged so as to overlap each other in the flow direction of the first heat exchange fluid. The heat exchanger according to claim 1 or 2, which is provided. 4. A plurality of upper heat transfer plates (11) are fixed to the upper heat transfer pipe (6) at substantially equal intervals, and a plurality of lower heat transfer plates are attached to the lower heat transfer pipe (7). The heat exchanger according to claim 3, wherein the (13) are fixed at substantially equal intervals. 5. The first type heat exchange fluid is combustion gas from a gas burner (3), and the second type heat exchange fluid is hot and cold water for supplying hot water to a hot water supply pipe (9). A flow path (5) for the combustion gas is formed from the lower side to the upper side in a cylinder body (2) having a gas burner (3) in the upper side of the cylinder body (2) and the heat transfer tube (6) on the upper hand side. The heat exchanger according to claim 1, 2, 3 or 4, wherein the lower heat transfer tube (7) and the lower heat transfer tube (6) are disposed below and the lower heat transfer tube (7) is disposed above. .