JP2004003840A - Heat transfer fin structure of heat exchanger for gas boiler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat transfer fin structure of a heat exchanger for a gas boiler capable of increasing heat transfer area to extremely increase heat exchanging efficiency, reducing cost of a product, and compacting the product. <P>SOLUTION: The gas boiler has a combustion chamber cover 10 having a combustion chamber 10a inside, the heat exchangers 24 disposed in the upper and lower parts of the combustion chamber, and a bas burner 22. The heat exchangers have a tubular tube 24a in which water circulates and a plurality of high fins 24b of not shorter than 9 mm extending from a plate surface to the radial outside on the outside of the tube. The high fins 24b are preferably rolled and fabricated to the tube 24a. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a heat transfer fin structure of a heat exchanger for a gas boiler, and more particularly, not only can increase a heat transfer area to increase heat exchange efficiency, but also can reduce product cost and make the product compact. The present invention relates to a heat transfer fin structure for a gas boiler heat exchanger.
[0002]
[Prior art]
Boilers used in general homes and public buildings are used for heating and hot water. Such boilers are roughly classified into oil boilers and gas boilers according to the type of fuel provided.
[0003]
Comparing an oil boiler and a gas boiler with the same capacity, the oil boiler is lower in price than the gas boiler at the purchase price, but has the advantage that the gas boiler consumes less fuel than the oil boiler.
However, in the long run, the costs to be borne by consumers can be said to be almost identical for both oil and gas boilers. Therefore, gas boilers are used in areas where city gas is supplied, and oil boilers are heavily used in other areas where city gas is not supplied.
[0004]
In recent years, the use of gas boilers has been gradually increasing with an increase in the area where city gas is supplied. A conventional gas boiler has a combustion chamber formed therein, a gas burner provided at a lower portion of the combustion chamber, and a heat exchanger provided at an upper portion.
When the gas burner is operated, the water flowing into the combustion chamber is exchanged by the heat exchanger, and the temperature of the water is increased.
[0005]
By the way, in such a conventional gas boiler, heat exchange is performed only by the heat exchanger itself provided in the combustion chamber, and therefore, the heat transfer area is limited. Therefore, in order to increase the heat transfer area, the size of the heat exchanger must be increased, so that there is a disadvantage that the gas boiler cannot be made compact.
[0006]
In addition, the heat exchanger used in the conventional gas boiler uses a heat transfer fin welded to the pipe of the water pipe without using a high finned tube, so that heat transfer performance is deteriorated. There is only. If more heat transfer fins are used to secure the heat transfer area, the material cost will increase only for the heat transfer fins to be used, the size of the product will increase, additional production of heat transfer fins and additional welding process will be required. There is a problem that the production cost is increased due to the above.
[0007]
[Problems to be solved by the invention]
Accordingly, the present invention has been devised to solve the above-mentioned problems, and has as its object to increase the heat transfer area and thereby significantly improve the heat exchange efficiency. It is to provide a thermal fin structure.
It is another object of the present invention to provide a heat transfer fin structure of a heat exchanger for a gas boiler, which not only can reduce the cost of the product but also can make the product compact.
[0008]
[Means for Solving the Problems]
The above-described object is to provide a gas boiler having a combustion chamber cover in which a combustion chamber is formed and heat exchangers and gas burners provided in upper and lower portions of the combustion chamber, respectively, wherein the heat exchanger has water inside. This is achieved by a heat transfer fin structure of a gas boiler heat exchanger, characterized by including a tubular tube through which circulates, and a plurality of high fins extending radially outward from a plate surface outside the tube.
Here, the height of the high fins is advantageously about 9 mm or more.
The high fins can be manufactured by rolling the tube.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic configuration diagram of a gas boiler according to one embodiment of the present invention. As shown in the figure, the gas boiler according to the present invention has a combustion chamber cover 10 forming an external appearance, and an exhaust gas guide plate 20 provided on an upper portion of the combustion chamber cover 10.
[0010]
The combustion chamber cover 10 usually has a square box shape. However, it may be cylindrical or another shape depending on the installation location or the efficiency and capacity of the gas boiler, and the design. A combustion chamber 10 a is formed in the combustion chamber cover 10.
[0011]
One side of the combustion chamber cover 10 is provided with a return water pipe 12 for returning water from a heating and hot water pipe (not shown), and the other side is provided with an internal heat exchange pipe 28 and a heat exchanger 24 described later. A supply pipe 14 is provided for supplying the heated hot water to the heating and hot water pipe again.
[0012]
An exhaust gas guide plate 20 provided at an upper portion of the combustion chamber cover 10 has an exhaust gas discharge hole 20a through which exhaust gas generated by a gas burner 22 described later is discharged to the outside. After being connected to a smoke tube (not shown), the exhaust gas discharge hole 20a discharges exhaust gas to the outside.
[0013]
A gas burner 22 which is operated by a fuel such as city gas and generates a flame is provided at a lower portion in the combustion chamber 10a. A heat exchanger 24 is provided above the combustion chamber 10a. The heat exchanger 24 performs a secondary heat exchange process in which cold water is warmed to warm water by the gas burner 22 together with an internal heat exchange tube 28 described later in detail.
[0014]
On the other hand, as shown in FIG. 2, the heat exchanger 24 that can be manufactured by rolling or the like has a tubular tube 24a in which water circulates, and a plurality of tubes extending radially outward from the plate surface outside the tube 24a. It has a high fin 24b. At this time, the height (H) of the high fins 24b can be increased to, for example, 9 mm or more to increase the heat transfer area.
[0015]
By providing the high fins 24b in this manner, there is a problem of an increase in material costs and an increase in the size of a product due to the use of a heat transfer fin (not shown) by welding to secure a heat transfer area as in the related art. In addition, the problem that the cost increases can be appropriately solved. Further, since the heat transfer area is increased by the high fins 24b, there is a remarkable effect that the product can be made compact.
[0016]
The connection pipe 26 is connected to the heat exchanger 24. The connecting pipe 26 has one end connected to the heat exchanger 24 and the other end disposed inside the combustion chamber cover 10.
Between the inner connection pipe 26 of the combustion chamber cover 10 and the return water pipe 12, there are provided internal heat exchange pipes 28 whose both ends communicate with the connection pipe 26 and the return water pipe 12, respectively. The internal heat exchange pipe 28 performs a primary heat exchange process in which cold water is warmed to warm water by the gas burner 22.
[0017]
In this embodiment, the internal heat exchange tube 28 is wound in a coil shape a plurality of times along the inner wall surface of the combustion chamber cover 10 as shown. At this time, it is preferable that the side surfaces to be wound are not in contact with each other, so that the heat transfer area of the gas burner 22 due to the flame can be increased to further enhance the heat exchange efficiency.
[0018]
With such a configuration, when the cooled water flows into the combustion chamber cover 10 through the return water pipe 12 in a state where the gas burner 22 is operated, the flowed water flows along the inside of the internal heat exchange pipe 28. The primary heat exchange process is performed by the increased heat transfer area in the process.
[0019]
Water subjected to the primary heat exchange process is subjected to a secondary heat exchange process toward the heat exchanger 24 through the connecting pipe 26. In the process in which the secondary heat exchange process is performed, the heat exchanger 24 according to the present invention includes the tube 24a and the plurality of high fins 24b extending radially outward from the plate surface of the tube 24a. The heat transfer area is increased and the heat exchange efficiency is significantly increased.
The water that has been heat-exchanged by the internal heat exchange pipe 28 and the heat exchanger 24 respectively flows through the supply pipe 14 to the heating and hot water pipes.
[0020]
As described above, in the present invention, the heat exchanger 24 is constituted by the tube 24a and the plurality of high fins 24b (High fin) extending radially outward from the plate surface of the tube 24a. 24 does not need to be made large, and the product can be made compact.
[0021]
On the other hand, in the above-described embodiment, the gas boiler provided with the internal heat exchange tube 28 has been described as an example. However, as shown in FIG. 3, the idea of the present invention can be applied to a gas boiler in which the internal heat exchange tube 28 is not provided.
As shown in FIG. 3, in a gas boiler according to another embodiment of the present invention, a gas burner 122 is provided below a combustion chamber cover 110 in which a combustion chamber 110a is formed, and a heat exchanger is provided above. 124 are provided.
[0022]
Although not shown in detail, such a heat exchanger 124 is also manufactured by rolling or the like, and has a tubular tube through which water circulates, and a plurality of tubes extending radially outward from a plate surface outside the tube. Take the configuration of high fins. At this time, the height of the high fin is, for example, 9 mm or more, so that the heat transfer area can be increased.
[0023]
An exhaust gas guide plate 120 is provided above the combustion chamber cover 110. On one side of the combustion chamber cover 110, a return water pipe 112 connected to a heating and hot water pipe for returning water is provided, and on the other side, hot water heated by a heat exchanger 124 is shown. A supply pipe 114 is provided to supply no heating and hot water piping.
[0024]
Here, when the cooled water flows into the combustion chamber cover 110 through the return water pipe 112 while the gas burner 122 is operated, the flow of water is exchanged by the heat exchanger 124 having an increased heat transfer area. After the temperature rises, it is supplied again to the heating and hot water pipe through the supply pipe 114.
[0025]
Thus, according to the present invention, not only the heat transfer area can be increased and the heat exchange efficiency can be significantly increased, but also the cost of the product can be reduced and the product can be made compact.
In the above-described embodiment, the internal heat exchange tube 28 is provided in the gas boiler. However, instead of such an internal heat exchange tube 28, a gas boiler provided with an external heat exchange tube (not shown) is provided. Also, the idea of the present invention can be sufficiently applied.
[0026]
【The invention's effect】
As described above, according to the present invention, by providing a heat transfer fin in the form of a high fin of 9 mm or more through rolling, there is an effect that the heat transfer area can be increased and the heat exchange efficiency can be significantly increased.
Further, according to the present invention, there is an effect of providing a heat transfer fin structure of a heat exchanger for a gas boiler which can not only reduce the cost of the product but also make the product compact.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a gas boiler according to an embodiment of the present invention.
FIG. 2 is an enlarged configuration diagram of the heat exchanger shown in FIG.
FIG. 3 is a schematic structural view of a gas boiler according to another embodiment of the present invention.
[Explanation of symbols]
10: combustion chamber cover, 10a: combustion chamber,
12: return water pipe, 14: supply pipe,
20: exhaust gas guide plate, 22: gas burner,
24: heat exchanger, 24a: tube,
24b: high fin, 26: connecting pipe,
28: Internal heat exchange tube

Claims (3)

In a gas boiler having a combustion chamber cover in which a combustion chamber is formed, and a heat exchanger and a gas burner provided in upper and lower portions of the combustion chamber, respectively.
The heat exchanger according to claim 1, wherein the heat exchanger includes a tubular tube through which water circulates, and a plurality of high fins extending radially outward from a plate surface outside the tube. Thermal fin structure. The heat transfer fin structure of a gas boiler heat exchanger according to claim 1, wherein the height of the high fin is about 9mm or more. The heat transfer fin structure of a heat exchanger for a gas boiler according to claim 1, wherein the high fin is rolled into the tube.

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