Heat Exchanger for Common Use for Boiler and Hot Water Supply

Abstract

A heat exchanger for common use for both a boiler and a hot water supply is provided, which includes a plurality of inner plate members (110) having inner plate member grooves formed on either side of the upper end thereof, and a burner provided on the bottom surface thereof, to thereby perform a combustion chamber function; combustion heat fin tubes (120) formed of a number of heat exchange tubes on the outer circumferential surface of which transfer heat fins are formed; an insulation member (130) which is installed in an identical area along the inner walls of the inner plate members; and an independent heat exchanger body which is connected with the combustion heat fin tubes. Thus, a heat exchanger for a condensing or noncondensing gas boiler can be manufactured at low cost, through the common heat exchanger Further, two kinds of heat exchangers can be manufactured through a single common heat exchanger to thereby make an additional process unnecessary.

Description

TECHNICAL FIELD

The present invention relates to a heat exchanger for common use for a boiler and a hot water supply, and more particularly to, a heat exchanger for common use for a boiler and a hot water supply in which a combustion chamber and a common heat exchanger can be used in common when manufacturing a non-condensing, semi-condensing and condensing boiler, to thereby make it possible to manufacture the non-condensing, semi-condensing and condensing boiler.

BACKGROUND ART

A boiler for use in general homes and buildings is used for heating rooms and supplying hot water, which is divided into a fuel oil boiler and a fuel gas boiler, according to a type of fuel used.

In the case of a gas fuel boiler, liquified petroleum gas (LPG) has been being used, but liquified natural gas (LNG) is being used since LNG contains few sulfuric component in comparison with LPG, to thus minimize an air pollution.

In addition, a gas boiler can be divided into a variety of types according to a control method or a sealing state thereof. Further, a gas boiler can be classified into a condensing gas boiler and a non-condensing gas boiler according to a method of re-collecting heat sources heating water.

As shown in FIGS. 1 and 2, a heat exchanger for use in a condensing boiler includes a combustion heat exchanger 29 which heats water directly using heat from a burner 10, and a latent heat exchanger 28 which heats water indirectly using latent heat of an exhaust gas passing through the combustion heat exchanger 29.

In the case of the heat exchanger of the condensing boiler, water flowing through combustion heat fin tubes 29′ is primarily heated by a combustion function of a burner 10, and an exhaust gas passing through an exhaust gas inlet 31 secondarily heats water in latent fin tubes 28′.

Here, a condensed water basin 32 which externally guides condensed water due to an exhaust gas is provided between the combustion heat exchanger 29 and the latent heat exchanger 28.

Further, a guide plate 33 slants at the same angle as the condensed water basin 32. An exhaust gas discharge portion 36 is formed in opposition to the exhaust gas inlet 31.

Thus, the exhaust gas passing through the combustion heat exchanger 29 flows in via one side of the latent heat exchanger 28 by the condensed water basin 32, passes through latent fin tubes 28′, and is discharged via an exhaust gas outlet 37 in an exhaust gas discharge portion 36. Accordingly, heat can be transferred toward the latent heat exchanger 28 for a sufficient time.

Meanwhile, as shown in FIGS. 3 and 4, in the case of a heat exchanger for use in a non-condensing boiler which is referred to as a non-condensing heat exchanger, a heat exchanger 30 is directly heated by combustion of a burner 10, and an exhaust gas is discharged via an exhaust gas outlet 37.

DISCLOSURE OF INVENTION

Technical Problem

Here, the non-condensing heat exchanger 30 is generally made of a copper material whose heat transfer rate is excellent. Since a high heat efficiency is pursued due to an energy policy and a control technology is developed, the non-condensing heat exchanger is designed to suppress condensation at maximum. However, a condensation phenomenon cannot be prevented from occurring partially or temporarily, which causes the heat exchanger to be corroded.

As described above, the heat exchanger of the condensing boiler shown in FIGS. 1 and 2 differs in its construction from that of the non-condensing boiler shown in FIGS. 3 and 4, due to respectively different heat absorption methods.

Thus, since respectively different structural heat exchangers should be manufactured in order to make a condensing boiler and a non-condensing boiler, it is difficult to share components of the heat exchangers. As a result, the material cost for the heat exchanger increases and the number of processes thereof increases as well.

Technical Solution

To solve the above problems, it is an object of the present invention to provide a heat exchanger for common use for a boiler and a hot water supply which enables a manufacturer to selectively manufacture a condensing boiler, a semi-condensing boiler and a non-condensing boiler at low cost, to thus save a development period, a manufacturing cost, and a management cost after mass-production, relatively in comparison with those of a conventional heat exchanger, in which a latent heat exchanger or a non-condensing heat exchanger (called an auxiliary heat exchanger) is combined on the upper end of the common heat exchanger which can be commonly used for manufacturing the condensing boiler, the semi-condensing boiler, and the non-condensing boiler.

It is another object of the present invention to provide a heat exchanger for common use for a boiler and a hot water supply which is made of a corrosion-resistant material and a hybrid metal corrosion-preventive structure and includes a condensed water basin as necessary.

It is still another object of the present invention to provide a heat exchanger for common use for a boiler and a hot water supply which has a structure of making an exhaust gas smoothly flow in which a latent heat exchanger is combined on the upper portion of the common heat exchanger when a condensing boiler is manufactured using the common heat exchanger and a duct is installed between the common heat exchanger and the condensing boiler, and which has a structure of regulating a flow of gas in which a non-condensing heat exchanger and a latent heat exchanger which are combined on the upper portion of the common heat exchanger have an identical same gas flow direction each other.

Advantageous Effects

As described above, a heat exchanger for a condensing and non-condensing gas boiler can be manufactured with a common heat exchanger according to the present invention. Accordingly, the heat exchanger for a gas boiler can be manufactured at low cost. Also, since two kinds of heat exchangers can be manufactured with a common heat exchanger, an additional process is not necessary.

In particular, since it is possible to share the common heat exchanger as a common component, condensing, semi-condensing, and non-condensing gas boilers can be selectively manufactured. As a result, a development period of a product, a manufacturing cost therefor, and a management cost therefor after mass-production can be saved relatively in comparison with those of a conventional heat exchanger.

In addition, a non-condensing boiler adopting a common heat exchanger according to the present invention has a high efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects and advantages of the present invention will become more apparent by describing the preferred embodiments thereof in detail with reference to the accompanying drawings in which:

FIGS. 1 and 2 are a perspective view and a cross-sectional view showing a conventional condensing heat exchanger, respectively;

FIGS. 3 and 4 are a perspective view and a cross-sectional view showing a conventional non-condensing heat exchanger, respectively;

FIG. 5 is a perspective view showing a common heat exchanger according to the present invention;

FIG. 6 is an exploded perspective view showing a common heat exchanger according to the present invention;

FIG. 7 is an exploded perspective view showing a common heat exchanger of FIG. 6 which additionally has an outer cover according to another embodiment of the present invention;

FIG. 8 is a perspective view showing an example of a condensing heat exchanger to which the common heat exchanger shown in FIG. 7 according to the present invention is applied;

FIG. 9 is an exploded perspective view showing the condensing heat exchanger shown in FIG. 8 according to the present invention;

FIG. 10 is an exploded perspective view showing only a latent heat exchanger separated from the condensing heat exchanger shown in FIG. 8 according to the present invention;

FIG. 11 is an exploded perspective view showing the latent heat exchanger shown in FIG. 10 according to the present invention;

FIG. 12 is a cross-sectional view showing the condensing heat exchanger shown in FIG. 8 according to the present invention;

FIG. 13 is a perspective view showing an example of a non-condensing heat exchanger to which the common heat exchanger shown in FIG. 7 according to the present invention is applied;

FIG. 14 is an exploded perspective view showing the non-condensing heat exchanger shown in FIG. 13 according to the present invention; and

FIG. 15 is a cross-sectional view showing the non-condensing heat exchanger shown in FIG. 13 according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

To accomplish the above object of the present invention, according to the present invention, there is provided a heat exchanger for common use for a boiler and a hot water supply, the common heat exchanger comprising: a plurality of inner plate members having inner plate member grooves formed on either side of the upper end thereof, and a burner provided on the bottom surface thereof, to thereby perform a combustion chamber function; combustion heat fin tubes formed of a number of heat exchange tubes on the outer circumferential surface of which transfer heat fins are formed so that a heat exchange is performed by hot water flows in the transfer heat fins in which the combustion heat fin tubes are mounted into the inner plate member grooves provided in the inner plate member; a heat insulation member which is installed in an identical area along the inner walls of the inner plate members; and an independent heat exchanger body which is connected with the combustion heat fin tubes so that hot water can flow and is formed of a plurality of water tubes wound on the outer circumferential surfaces of the inner plate members.

Preferably, an outer cover is further installed at the outermost portion of the heat exchanger body so as to surround the plurality of water tubes wound on the outer circumferential surfaces of the inner plate members.

In addition, a structure of a condensing boiler is formed in the case that a latent heat exchanger having latent fin tubes absorbing latent heat in the latent heat exchanger body is independently combined on the upper portion of the heat exchanger body.

Here, it is preferable that a duct is formed between the heat exchanger body and the latent heat exchanger to thus make an exhaust gas smoothly flow.

Meanwhile, a structure of a non-condensing boiler having a relatively high output capacity is formed in the case that an auxiliary heat exchanger absorbing only combustion heat is independently combined on the upper portion of the heat exchanger body.

Mode for the Invention

Hereinbelow, a common heat exchanger for common use for a non-condensing boiler and a condensing boiler according to the present invention will be in detail described with reference to the accompanying drawings.

FIG. 5 is a perspective view showing a common heat exchanger according to the present invention. FIG. 6 is an exploded perspective view showing a common heat exchanger according to the present invention. FIG. 7 is an exploded perspective view showing a common heat exchanger of FIG. 6 which additionally has an outer cover according to another embodiment of the present invention.

As shown in FIGS. 5 and 6, a common heat exchanger 1 according to the present invention largely includes a plurality of inner plate members 110, combustion heat fin tubes 120, a heat insulation member 130, and water tubes 140, all of which are formed as an independent heat exchanger body 100.

Here, the inner plate members 110 perform a combustion chamber function as in a conventional heat exchanger.

That is, the inner plate members 110 has a rectangular box structure having a burner (not shown) which burns air and gas inhaled by operation of a blower (not shown) provided on the bottom surface thereof, and a plurality of inner plate member grooves 111 into which the plurality of combustion heat fin tubes 120 are assembled on both sides of the upper end thereof, to thereby perform a combustion chamber function in a boiler.

Here, windows 112 can be provided on the inner plate members 110 so that a user can monitor a burning flame from the outside of the heat exchanger.

The combustion heat fin tubes 120 are formed of a number of heat exchange tubes on the outer circumferential surface of which transfer heat fins are formed so that a heat exchange is performed by hot water flows in the transfer heat fins. It is preferable that the combustion heat fin tubes 120 are made of a copper material whose heat transfer rate is excellent as in a conventional heat exchanger in a conventional gas boiler, and it is manufactured to have a structure of contacting combustion heat due to combustion of the burner as a number of times as possible.

One end of the combustion heat fin tubes 120 is connected with a hot water supply tube (not shown) of a gas boiler and the other end thereof is connected with a fin tube of a latent heat exchanger 53 or a non-condensing heat exchanger to be described later.

The combustion heat fin tubes 120 are connected in zigzag form via U-shaped tubes 121. Accordingly, the plurality of the combustion heat fin tubes 120 form a single long tube so that water flowing therein is heat-exchanged with the combustion heat, to thus perform a combustion chamber function.

Here, the U-shaped tubes 121 are made of the same material as that of the combustion heat fin tubes 120 in order to prevent a corrosion occurring in hybrid metal between the U-shaped tubes 121 and the combustion heat fin tubes 120.

Thus, the hot water which flows in via one end of the combustion heat fin tubes 120 from the hot water supply tube flows along the respective combustion heat fin tubes 120 via the U-shaped tubes 121 so as to be heat-exchanged with the combustion heat from the burner for a long time.

As shown in FIG. 6, since the inner plate members 110 perform a combustion chamber function, it is preferable that a heat insulation member 130 is installed in the inner plate members 110 in order to isolate combustion heat from being discharged out via the inner plate members 110 in the case that combustion occurs in the inside of the inner plate members 110.

Here, since it is preferable that the insulation material 130 is provided over the whole inner walls of the inner plate members 110, the insulation member 130 is installed in the inner walls of the inner plate members 110 in the same area and substantially same structure as those of the inner plate members 110.

In addition, a plurality of water tubes 140 connected with the combustion heat fin tubes 120 are wound on the outer circumferential surfaces of the inner plate members 110, in order to absorb the combustion heat discharged from the inner plate members 110 as much as possible, to thus enhance a heat efficiency.

As shown in FIG. 7, according to another aspect of the present invention, an outer cover 150 is further installed at the outermost portion of the heat exchanger body so as to surround the plurality of water tubes 140 wound on the outer circumferential surfaces of the inner plate members 110.

It is preferable that the outer cover 150 has a structure of the same shape as that of the inner plate members 110, like the insulation member 130.

In particular, the outer cover 150 can absorb heat discharged from the combustion chamber via the inner plate members 110 to a degree using a material of metal, and isolate the outer portions of the inner plate members 110 from users to thereby protect them safely from contacting the hot portions. Further, the outer cover 150 does not expose the water tubes 140 wound on the outer walls of the inner plate members 110, to thereby play a role of making an external countenance look good.

That is, although heat radiated from the inner plate members 110 via the insulation member 130 has been prevented at maximum, high-temperature combustion heat can be discharged out via the inner plate members 110 to a degree. Here, the water tubes 140 wound on the outer walls of the inner plate members 110 can absorb the high-temperature combustion heat to thus primarily heat-exchange with the combustion heat, and simultaneously isolate heat discharged from the outer cover 150 to further prevent a thermal loss.

In particular, since the outer cover 150 absorbs a relatively small amount of heat, the surface temperature of the outer cover 150 is remarkably lowered. Although users get in touch with the outer cover 150, a danger of a burn can be reduced.

In the case that the common heat exchanger 1 is manufactured, a burner is provided on the bottom surface of the inner plate members 110, and then the combustion heat fin tubes 120 are assembled with a plurality of inner plate member grooves 111 provided on either side of the upper end of the inner plate members 110. Then, the plurality of combustion heat fin tubes 120 are connected via U-shaped tubes 121 excluding one end and the other end of the plurality of the combustion heat fin tubes 120.

At the state where the common heat exchanger 1 according to the present invention has been provided as described above, a condensing gas boiler or non-condensing boiler can be manufactured as desired.

Hereinbelow, a condensing boiler to which the common heat exchanger 1 according to the present invention is applied will be described with reference to FIGS. 8 through 12.

FIG. 8 is a perspective view showing an example of a condensing heat exchanger to which the common heat exchanger shown in FIG. 7 according to the present invention is applied. FIG. 9 is an exploded perspective view showing the condensing heat exchanger shown in FIG. 8 according to the present invention. FIG. 10 is an exploded perspective view showing only a latent heat exchanger separated from the condensing heat exchanger shown in FIG. 8 according to the present invention. FIG. 11 is an exploded perspective view showing the latent heat exchanger shown in FIG. 10 according to the present invention. FIG. 12 is a cross-sectional view showing the condensing heat exchanger shown in FIG. 8 according to the present invention.

As shown in FIGS. 8 through 12, a latent heat exchanger 2 which can absorb latent heat from an exhaust gas is independently combined on the upper portion of a common heat exchanger 1 according to the present invention, to thus form a condensing heat exchanger.

Here, a separate duct 300 is formed between the common heat exchanger 1 and the latent heat exchanger 2 to thus make an exhaust gas smoothly flow in the case that the latent heat exchanger 2 is combined with the common heat exchanger 1.

That is, the duct 300 is combined on the upper portion of the combustion heat fin tubes 120 in the common heat exchanger 1.

Here, as shown in more detail in FIG. 11, the duct 300 includes an exhaust gas outlet 303 through which an exhaust gas having passed through the combustion heat fin tubes 120 is discharged and which is provided on part of the upper surface 301 thereof, and an inclined surface 302 provided in opposition to the exhaust gas outlet 303.

The latent heat exchanger body 200 of the latent heat exchanger 2 is combined on the duct 300.

The bottom surface of the latent heat exchanger body 200 has a structure corresponding to the upper surface 301 and the inclined surface 302 of the duct 300, and has an exhaust gas inlet 201 in correspondence to the same position as that of the exhaust gas outlet 303.

A condensed water outlet 202 through which condensed water formed due to the exhaust gas is discharged is provided on the lowermost end of the bottom surface of the latent heat exchanger body 200.

A plurality of latent heat fin tubes 210 through which hot water flows are provided in the latent heat exchanger body 200.

The latent heat fin tubes 210 perform a heat exchange like the combustion heat fin tubes 120 in the common heat exchanger 1, and are preferably made of a corrosion-resistant material such as aluminum and stainless steel, to thereby prevent corrosion due to condensation. More preferably, the latent heat fin tubes 210 are made of a plurality of tubes each having a double structure, in which a copper tube is inserted into the inside of an aluminum tube whose cost is lower than that of the cooper tube, differently from the combustion heat fin tubes 120 which are made of copper tubes.

Here, the latent heat fin tubes 210 are fitted with separate lateral plates 220 which cover the lateral surfaces of the latent heat exchanger body 200, and are connected with each other by U-shaped tubes 221, to thereby form a single tube through which hot water can flow.

The latent heat fin tubes 210 are connected with the combustion heat fin tubes 120 and a hot water inlet tube (not shown) both which are positioned below the latent heat fin tubes 210, through connection tubes 222 and 223.

As a result, as shown in FIG. 11, hot water having flown in from the connection tube 223 through the unshown hot water inlet tube flows through the plurality of latent heat fin tubes 210 for a long time, and then flows out to the combustion heat fin tubes 120 via the other connection tube 222, to accordingly perform a heat exchange through the high-temperature exhaust gas and the combustion heat.

Meanwhile, an exhaust gas tower 230 forming the latent heat exchanger 1 generally is provided on the upper ends of the latent heat exchanger body 200 and the lateral plates 220.

The exhaust gas tower 230 includes an exhaust gas outlet 231 for discharging an exhaust gas on the upper end thereof.

A guide plate 240 which guides a flow of the exhaust gas so that an exhaust gas can flow over the whole of the plurality of latent heat fin tubes 210 and firmly fixes the latent heat fin tubes 210 is provided between the latent heat fin tubes 210 and the exhaust gas tower 230.

It is preferable that the guide plate 240 is formed to have the same inclination as those of the latent heat fin tubes 210 which are slantedly installed in the latent heat exchanger body 200.

As shown in FIG. 9, a packing 170 made of rubber is provided between the inner plate members 110 with which the combustion heat fin tubes 120 are fitted and the duct 300, to thereby enable the upper sides of the inner plate members 110 and the lower side of the duct 300 to be connected with each other stably while maintaining a sealing capability.

In the case of the condensing heat exchanger to which the common heat exchanger according to the present invention is applied as described above, water in the combustion heat fin tubes 120 is primarily heated by the combustion heat of the burner 10, and then the latent heat fin tubes 210 are heated by gas having passed through the duct 300, as shown in FIG. 12, to thereby provide a heat exchanger for a condensing gas boiler.

Hereinbelow, a non-condensing gas boiler to which the common heat exchanger 1 according to the present invention is applied will be described with reference to FIGS. 13 through 15.

FIG. 13 is a perspective view showing an example of a non-condensing heat exchanger to which the common heat exchanger shown in FIG. 7 according to the present invention is applied. FIG. 14 is an exploded perspective view showing the non-condensing heat exchanger shown in FIG. 13 according to the present invention. FIG. 15 is a cross-sectional view showing the non-condensing heat exchanger shown in FIG. 13 according to the present invention.

A non-condensing boiler shown in FIG. 13 has an auxiliary heat exchanger having a relatively small capacity installed in a common heat exchanger according to the present invention. The auxiliary heat exchanger which absorbs only combustion heat can suppl ement an output capacity which is insufficient with only a common heat exchanger.

That is, as shown in FIGS. 13 to 15, an auxiliary heat exchanger 3 which absorbs only combustion heat is mounted on the common heat exchanger 1 according to the present invention, to thereby form a non-condensing heat exchanger. The non-condensing heat exchanger has a structure in which a cover-shaped exhaust gas duct 160 is installed on the inner plate members 110 in the common heat exchanger 1, and auxiliary combustion heat fin tubes 310 are installed between the exhaust gas duct 160 and the combustion heat fin tubes 120 on the upper end surfaces of the inner plate members 110.

An exhaust gas outlet 161 is provided in the exhaust gas duct 160 formed on the upper portion of the auxiliary heat exchanger 3.

That is, as shown in FIG. 14, a plurality of inner plate member grooves 111 are provided on both sides of the upper ends of inner plate members 110. A plurality of combustion heat fin tubes 120 which heat water through heat exchanging with combustion heat are mounted into the inner plate member grooves 111 which are then tightly assembled with a separate lateral plate 180.

Here, the combustion heat fin tubes 120 are preferably made of a form rolling fin structure where fins are form rolled on a tube made of copper, respectively.

Of course, the fins on the combustion heat fin tubes 120 can be combined on the outer circumferential surface of the tubes through a well-known brazing weld.

The auxiliary combustion heat fin tubes 310 installed on the upper portion of the combustion heat fin tubes 120 are mounted between the upper end of the lateral plate 180 and exhaust gas duct grooves 162 in the exhaust gas duct 160.

Here, the auxiliary combustion heat fin tubes 310 are preferably made of a form rolling fin structure where fins are form rolled on a tube made of aluminum which is cheap and has a good corrosion-resistant capability in comparison with copper, respectively.

Of course, in the case of the auxiliary combustion heat fin tubes 310, the fins provided on the outer circumferential surfaces of the tubes can be also formed of a well-known general fin structure, not a form rolling fin structure.

Since an auxiliary heat exchange is performed in the auxiliary combustion heat fin tubes 310, they do not need to be made of fin tubes of copper which is expensive.

That is, the combustion heat fin tubes 120 whose exhaust gas temperature is high are made of copper in order to prevent damage due to high temperature, while the auxiliary combustion heat fin tubes 310 whose exhaust gas temperature is relatively low are made of aluminum. In this manner, the heat exchanger according to the present invention can be manufactured at low cost.

The auxiliary combustion heat fin tubes 310 are connected with each other by means of U-shaped tubes 311, respectively, according to a conventional method.

The auxiliary combustion heat fin tubes 310 and the combustion heat fin tubes 120 are connected with each other via connection tubes 312, respectively.

In particular, the lateral plate 180 combined with both sides of the upper portion of the inner plate members 110 is separately manufactured from the inner plate members 110 and plays a role of fixing and supporting the combustion heat fin tubes 120 and the auxiliary combustion heat fin tubes 310 together with the inner plate members 110 and the exhaust gas duct 160.

As described above, since the combustion heat fin tubes 120 and the auxiliary combustion heat fin tubes 310 are assembled with each other between the common heat exchanger 1 and the auxiliary heat exchanger 3, by means of the lateral plate 180, the number of connection portions is reduced to thereby reliably maintain air-tightness of the heat exchanger.

In addition, as shown in FIG. 14, a packing 170 is provided between the inner plate members 110 where the combustion heat fin tubes 120 are fitted and the auxiliary heat exchanger 3. Accordingly, the upper sides of the inner plate members 110 and the lower sides of the auxiliary heat exchanger 3 can be stably combined with each other while maintaining air-tightness.

Here, the number of the auxiliary combustion heat fin tubes 310 is generally smaller than that of the combustion heat fin tubes 120.

As shown in FIGS. 13 through 15, the exhaust gas duct 160 has a structure that the volume of the duct is reduced upwards. As a result, the number of the auxiliary combustion heat fin tubes 310 can be reduced and simultaneously a flow of the exhaust gas can be stably guided in the direction of the exhaust gas outlet 161.

An assembly process and combustion process of the non-condensing heat exchanger according to the present invention having the above-described structure will be described below in brief.

First, the inner plate members 110, the exhaust gas duct 160, the lateral plate 180, the combustion heat fin tubes 120, and the auxiliary combustion heat fin tubes 310 are sequentially combined one after another and then the auxiliary combustion heat fin tubes 310 and the combustion heat fin tubes 120 are connected with each other via the connection tubes 312, respectively. Accordingly, the non-condensing heat exchanger can be simply assembled.

As shown in FIG. 15, the water which is primarily heated by the combustion heat fin tubes 120 flows toward the auxiliary combustion heat fin tubes 310 via the connection tubes 312, and then is secondarily heated by the exhaust gas.

As described above, in the case of the heat exchanger of the non-condensing gas boiler, the water in the lower-side combustion heat fin tubes 120 is heated by combustion heat of the burner 10 via the heat exchanger to which the common heat exchanger in the gas boiler according to the present invention is applied, and then the water in the upper-side auxiliary combustion heat fin tubes 310 is heated.

In particular, the combustion heat fin tubes 120 play a role of a main heat exchanger, and the auxiliary combustion heat fin tubes 310 play a role of an auxiliary heat exchanger. As a result, the non-condensing gas boiler absorbs only combustion heat in the combustion chamber in order to perform heat exchange.

Meanwhile, the common heat exchanger of the gas boiler according to the present invention can be applied to a downstream combustion gas boiler having a burner which is provided in the upper portion thereof.

In addition, the common heat exchanger according to the present invention can be applied to a general gas boiler in which a gas boiler and a conventional heat exchanger are integrated. That is, the integrated heat exchanger is divided into several heat exchangers and then part of the divided heat exchangers are made of conventional copper heat exchangers and the rest of the divided heat exchangers are made of corrosion-resistant heat exchangers, in which condensed water basin is installed.

Also, a heat exchanger of a form rolling fin structure according to the present invention can be made by brazing fins on a copper tube, a double tube of a copper tube and an aluminum tube, or a stainless steel tube. Here, it is apparent to one who has an ordinary skill in the art that a heat exchanger structure can be easily varied and modified.

Claims

1. A heat exchanger for common use for a boiler and a hot water supply, the common heat exchanger comprising:

a plurality of inner plate members having inner plate member grooves formed on either side of the upper end thereof, and a burner provided on the bottom surface thereof, to thereby perform a combustion chamber function;

combustion heat fin tubes formed of a number of heat exchange tubes on the outer circumferential surface of which transfer heat fins are formed so that a heat exchange is performed by hot water flows in the transfer heat fins in which the combustion heat fin tubes are mounted into the inner plate member grooves provided in the inner plate members;

an insulation member which is installed in an identical area along the inner walls of the inner plate members; and

an independent heat exchanger body which is connected with the combustion heat fin tubes so that hot water can flow and is formed of a plurality of water tubes wound on the outer circumferential surfaces of the inner plate members.

2. The common heat exchanger according to claim 1, further comprising an outer cover installed at the outermost portion of the heat exchanger body so as to surround the plurality of water tubes wound on the outer circumferential surfaces of the inner plate members.

3. The common heat exchanger according to claim 1 or 2, wherein a structure of a condensing boiler is formed in the case that a latent heat exchanger having latent fin tubes absorbing latent heat in the latent heat exchanger body is independently combined on the upper portion of the heat exchanger body.

4. The common heat exchanger according to claim 3, wherein a duct is formed between the heat exchanger body and the latent heat exchanger to thus make an exhaust gas smoothly flow.

5. The common heat exchanger according to claim 1 or 2, wherein a structure of a non-condensing boiler having a relatively high output capacity is formed in the case that an auxiliary heat exchanger absorbing only combustion heat is independently combined on the upper portion of the heat exchanger body.