KR20080056375A - Heat exchanger for boiler composed of dual material - Google Patents

Abstract

A dual heat exchanger for a boiler is provided to use copper together with aluminum, so that an anti-corrosion function is provided, and the efficiency of the heat exchanger is increased. Two copper pipe protecting members(110) are arranged at a predetermined interval in parallel to each other. Copper pipes(120) are arranged in a zig-zag way through the copper pipe protecting members. A plurality of heat exchanging fins(130) are provided. Aluminum pipe upper portion protecting members(210) are attached to two opposite copper pipe protecting members. An aluminum pipe(220) is connected to the copper pipe. An aluminum heat exchanger(200) includes a plurality aluminum heat exchanging fins(230).

Description

Double Heat Exchanger for Boiler {HEAT EXCHANGER FOR BOILER COMPOSED OF DUAL MATERIAL}

1 is a configuration diagram showing a general boiler.

Figure 2a is a front view showing a double heat exchanger according to the present invention.

FIG. 2B is a plan view of FIG. 2A.

FIG. 2C is a left side view of FIG. 2A.

FIG. 2D is a right side view of FIG. 2A.

3A is a plan view showing another example of a double heat exchanger according to the present invention.

3B is a front view of FIG. 3A.

3C is a right side view of FIG. 3A.

4A is a plan view of the combustion guide.

4B is a front view of FIG. 4A.

4C is a side cross-sectional view of FIG. 4B.

5 is a cross-sectional view illustrating a state in which the dual heat exchanger of FIG. 2 is coupled with a burner.

<Explanation of symbols for the main parts of the drawings>

100: copper heat exchanger 110: copper lower guard

120: copper pipe 130: copper heat exchange fin

200: aluminum heat exchanger 210: aluminum upper guard

220: aluminum pipe 230: aluminum heat exchange fin

240: combustion guide 241: exhaust hole

The present invention relates to a double heat exchanger for a boiler, and in particular, the lower half of the heat exchanger is made of copper (Cu), the upper half of the heat exchanger is made of aluminum (Al), and the upper half is covered with a combustion guide to reduce heat loss. The present invention relates to a double heat exchanger for a boiler capable of effectively preventing corrosion and increasing heat exchange efficiency.

The boiler is installed in a general house or various buildings and is used for heating or hot water. Most of these boilers heat the water using the combustion heat generated by burning the burner by using oil or gas as fuel, and circulate the heated hot water into the room for heating, or as needed by the user. It is made to use.

Among these boilers, there are many types of gas boilers, and they are classified into various types according to the installation type. The types of expansion tanks can be classified into closed gas boilers and open gas boilers, and hot water heat exchangers are installed. It can be divided into single type and dual type. The dual type gas boiler has a structure in which the hot water heat exchanger is inserted into the heating heat exchanger pipe, and the single type gas boiler has a structure in which the hot water heat exchanger is installed separately from the heating heat exchanger.

1 shows a typical single type gas boiler.

The single-type gas boiler shown in FIG. 1 heats a heating heat exchanger 10 for heating a heating water by heat exchange to heat a room through a heating pipe 11, and a heating water passing through the heating heat exchanger 10. Burner 20, a circulating pump 30 for circulating the heating water, and direct water (cold water) are supplied through a direct water pipe 41 to exchange heat with the heating water passing through the heating heat exchanger 10 to generate hot water. The hot water heat exchanger 40 to be supplied through the hot water supply pipe 42 and the hot water pipe 43 and the flow path of the heating water passed through the heating heat exchanger 10 to the heating pipe 11 or hot water heat exchanger ( And a three-way valve 50 to selectively switch toward 40). Reference numeral 60 denotes a controller installed in the boiler, and reference numeral 61 denotes a temperature sensor for detecting the temperature of the heating water.

According to the gas boiler configured as described above, when the controller 60 is controlled in the heating mode through the operation of a room controller (not shown) in the room, the three-way valve 50 opens the flow path toward the heating pipe 11. Since it operates to block the flow path of the hot water heat exchanger 40, the heating water flows through a loop formed by the heat exchanger 10 and the heating pipe 11 by the circulation pump 30, thereby heating the room. This is done.

In addition, when the user turns on the faucet to use hot water in the controlled state in the hot water mode, the three-way valve 50 operates to block the flow path of the heating pipe 11 side and open the flow path of the hot water heat exchanger 40 side. , Direct water is supplied from the water tank to the hot water heat exchanger (40) through the water pipe (41). Therefore, the heat exchange of the direct water with the heating water passing through the hot water heat exchanger 40 is made, the direct water is changed to hot water, the hot water is supplied by the user through the hot water supply pipe 42 inside the boiler and the hot water pipe 43 outside the boiler. It is supplied with a faucet.

In the boiler as described above, the heating heat exchanger 10 is usually made of copper in consideration of heat transfer and corrosion resistance, etc., the lower half of the heating heat exchanger 10 receives the heat supplied from the burner 20 efficiently. On the other hand, the upper half of the heating heat exchanger 10 adjacent to the exhaust duct does not receive heat effectively, and the combustion gas leaves the exhaust duct as it is. In addition, although copper is resistant to corrosion, it does not corrode when used for a long time, so it is necessary to more clearly deal with corrosion.

In view of this point, Korean Utility Model Model No. 201623 proposed a heat exchanger having a composite metal material. The heat exchanger is a condensing heat exchanger. The heat exchanger and the latent heat dissipation metal pipes are made of copper pipes and stainless pipes, respectively, and the heat-sensing fins are provided.

By the way, in the said heat exchanger, although the latent heat part is comprised by the stainless pipe, it can cope with corrosion, but in general, a stainless material is known that heat transfer rate is not so good, and it is difficult to achieve the objective and the specific gravity is large, and the total weight of a boiler This raises the problem. In addition, since copper and stainless are significantly different in physical properties such as melting point, there is also a problem that it is not easy to connect the connecting parts of the two materials by brazing or the like. In addition, there is a problem that the exhaust gas that has passed through the sensible heat portion exits as it is.

As described above, in the case of a condensing heat exchanger, efforts have been made to solve a thermal efficiency problem or a corrosion problem by applying a composite material, but the heating heat exchanger 10 of a typical boiler as shown in FIG. No measures have been taken.

The present invention has been made in consideration of the above-described conventional problems, and an object of the present invention is to provide a double heat exchanger for a boiler that can effectively prevent corrosion and increase the heat exchanger by applying copper and aluminum materials in combination.

Another object of the present invention is to further increase the heat exchange efficiency by covering the upper half of the heat exchanger through which the combustion gas is exhausted to reduce heat loss.

In order to achieve the above object, the double heat exchanger for a boiler according to the present invention, both copper lower guards arranged side by side at a predetermined interval, the copper pipe is zigzag arranged in a predetermined path via the both copper lower guards and the A copper heat exchanger having a plurality of copper heat exchange fins fitted in the outer circumference along the copper pipe; Both aluminum upper guards attached to the upper portions of the both copper lower guards, an aluminum pipe zigzag arranged in a predetermined path via the two aluminum upper guards, one end of which is connected to the copper pipe, and inserted into the outer circumference along the aluminum pipe It characterized in that it comprises a; aluminum heat exchanger having a plurality of aluminum heat exchange fins.

At this time, the combustion guide to cover the upper half of the aluminum heat exchanger under the exhaust duct of the boiler further comprises a combustion guide, the upper surface of the combustion guide at least one exhaust hole through the exhaust duct is a predetermined size It is preferable to form.

The combustion guide is preferably formed of aluminum.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

2a to 2d show an example of a double heat exchanger for a boiler according to the invention.

The boiler double heat exchanger according to the present invention comprises a copper heat exchanger (100) at the bottom and an aluminum heat exchanger (200) at the top.

The copper heat exchanger 100 is zigzag arranged in a predetermined path via both copper lower guards 110 and 110 arranged side by side at a predetermined interval and the copper lower guards 110 and 110. It comprises a pipe 120 and a plurality of copper heat exchange fins 130 fitted to the outer circumference along the copper pipe 120. The copper lower guards 110, the copper pipe 120 and the copper heat exchange fins 130 are all integrally bonded.

One end of the copper pipe 120, which is drawn out of the copper lower guard 110 on one side, functions as a heating water outlet 121 for discharging the heating water toward the heating pipe or the hot water heat exchanger.

In addition, the aluminum heat exchanger 200 is preferably integrally bonded to the upper portion of the copper heat exchanger 100, both aluminum upper guards 210, which are attached to the upper portion of both copper lower guards (110, 110) 210, an aluminum pipe 220 zigzag arranged in a predetermined path via both aluminum upper guards 210 and 210, one end of which is connected to the copper pipe 120, and the aluminum pipe 220 It comprises an aluminum heat exchanger 200 having a plurality of aluminum heat exchange fins 230 fitted to the outer periphery. Preferably, the aluminum upper guards 210, the aluminum pipe 220, and the aluminum heat exchange fins 230 are integrally joined together.

In the aluminum heat exchanger 200, the aluminum pipe 220 drawn out of the aluminum upper guard 210 on one side to function as a heating water return port 221 to return the heating water from the heating pipe or hot water heat exchanger side. do.

For example, as shown in FIG. 5, the heat exchanger of the present invention may be mounted to the boiler in an upward combustion manner such that the burner 300 is disposed below the heat exchanger 100, and the combustion gas by the burner 300 is provided. The combustion guide 240 is further provided in order to delay the exit of the exhaust duct 310 immediately after passing through the copper heat exchanger 100 so that the combustion gas can be sufficiently heat exchanged with the aluminum heat exchanger 200. Can be.

As shown in FIGS. 4A to 4C and 5, the combustion guide 240 covers the upper half of the aluminum heat exchanger 200 under the exhaust duct 310 of the boiler to retain the combustion gas. have. That is, the combustion guide 240 has a dome structure having a ceiling portion and both inclined bends, and has a structure capable of retaining combustion gas and collecting heat exchanged combustion gas upwards. In order to flow the collected combustion gas into the exhaust duct 310, at least one exhaust hole 241 passing through the exhaust duct 310 is formed in a predetermined size on an upper surface of the combustion guide 240. In the example, two exhaust holes 241 and 241 are formed side by side along the longitudinal direction of the combustion guide 240.

The combustion guide 240 may be formed of, for example, aluminum.

Meanwhile, another example of the dual heat exchanger for a boiler according to the present invention is shown in FIGS. 3A to 3D. The dual heat exchanger of this example is different from the former example in that only the bending path of the copper pipe 120 and the aluminum pipe 220 is different. Except that the rest are the same, so detailed description thereof will be omitted here.

Next, the operation of the boiler double heat exchanger according to the present invention configured as described above will be described.

When operating the boiler to which the dual heat exchanger of the present invention is applied, the gas is ignited by the burner 300 to heat the copper heat exchanger 100, and the heating water from the heating pipe or the hot water heat exchanger is heated through the heating water return port 221. It flows into the aluminum heat exchanger 200 and flows to the copper heat exchanger 100.

Therefore, the heating water flowing through the heat exchanger 100 is directly heated by the combustion heat of the burner 300 so that the temperature of the heating water rises rapidly, and the heating water flowing through the aluminum heat exchanger 200 is the copper heat exchanger ( During 100), some temperature is heated by the deprived combustion gas. The combustion gas passes over the aluminum heat exchanger 200, and part of the combustion gas is discharged to the exhaust duct 310 of the boiler through the exhaust hole 241 of the combustion guide 240, and most of the combustion gas is hit by the combustion guide 240 again. It flows toward the aluminum heat exchanger 200 to heat the aluminum heat exchanger 200 again. That is, since the discharge of the combustion gas is delayed as much as possible by the combustion guide 240, the heat of the combustion gas can be heat exchanged as efficiently as possible. In the case of the aluminum heat exchanger 200, since the heat transfer efficiency is good, The heat exchange efficiency between the heating water and the combustion gas can be maximized.

According to the dual heat exchanger for a boiler according to the present invention configured as described above, by making the lower portion is made of copper and the upper portion is made of aluminum, it is possible to recover the heat of the combustion gas discharged by the aluminum having good heat transfer efficiency as much as possible. In addition, since the combustion guide 240 can delay the discharge of the combustion gas as much as possible, it is possible to significantly increase the heat exchange efficiency, thereby making the heat exchanger with a compact size compared to the same heat capacity, and reducing the boiler operating fuel cost. It can save a lot.

In addition, since aluminum has stronger corrosion resistance than copper, durability of the heat exchanger can be improved.

Claims (3)

Both copper lower guards 110 and 110 arranged side by side at a predetermined interval, the copper pipe 120 zigzag arranged in a predetermined path via the both copper lower guards and fitted to the outer periphery along the copper pipe Copper heat exchanger 100 having a plurality of copper heat exchange fins 130, Both aluminum upper guards 210 and 210 attached to the upper portions of both copper lower guards, aluminum pipes 220 zigzag arranged in a predetermined path via both aluminum upper guards, and one end of which is connected to the copper pipe; A double heat exchanger for a boiler comprising: an aluminum heat exchanger (200) having a plurality of aluminum heat exchange fins (230) fitted along its aluminum circumference. The method of claim 1, It further comprises a combustion guide 240 for covering the upper half of the aluminum heat exchanger 200 in the lower portion of the exhaust duct 310 of the boiler to retain the combustion gas, the upper surface of the combustion guide to the exhaust duct 310 At least one exhaust hole 241 through the boiler is a double heat exchanger, characterized in that formed in a predetermined size. The method of claim 2, The combustion guide 240 is a dual heat exchanger for the boiler, characterized in that formed of aluminum.

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