KR20080056364A - Heat exchanger for condensing boiler - Google Patents

Abstract

A heat exchanger for a condensing boiler is provided to integrally form a condensed water receiving plate and an exhaust guide between a sensible heat exchanging unit and a latent heat exchanging unit. A heat exchanger case(100) includes support plates having a plurality water pockets, a heating water collecting member formed at one of upper water pockets, a heating water discharging member, and front and rear plates(105,106). A latent heat exchanging unit(130) is installed at the upper end of the heat exchanger case to communicate to the upper water pocket. A sensible heat exchanging unit(120) is installed at the lower portion of the latent heat exchanging unit to communicate with the lower water pocket. A condensed water receiving plate(140) partitions the latent heat exchanging unit and the sensible heat exchanging unit. A condensed water exhaust port(141) is formed at the outside of the heat exchanger case. An exhaust guide(150) is curved to the condensed water exhaust port from the upper portion of the latent heat exchanging unit.

Description

Heat Exchanger for Condensing Boiler {HEAT EXCHANGER FOR CONDENSING BOILER}

1 is a configuration diagram showing a conventional condensing boiler.

2 is a front view showing a partial cross section of the heat exchanger for a condensing boiler according to the present invention.

3 is a left side view of FIG. 2.

4 is a right side view of FIG. 2.

5 is a cross-sectional view taken along the line A-A of FIG.

FIG. 6 is a perspective view illustrating a joining structure between a tubular pipe and a front plate or a rear plate of a heat exchanger case; FIG.

7 is a front view showing that the burner is coupled to the lower portion of the heat exchanger according to the present invention.

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

100: heat exchanger case 101: support plate

102: water pocket 103: heating water return hole

104: heating water outlet 105: front panel

106: rear panel 110: exhaust duct

120: sensible heat exchanger 121, 131: tubing pipe

130: latent heat exchanger 140: condensate collection

141: condensate outlet 150: exhaust guide

The present invention relates to a heat exchanger for a condensing boiler, and in particular, the condensate receiver is integrated between the sensible heat exchanger and the latent heat exchanger, and the exhaust guide is also integrated to reduce the size and to provide a packing required for the separate type. The present invention relates to a heat exchanger for condensing boilers that can reduce manufacturing costs by eliminating structures such as oils.

Boilers used for heating and hot water supply in general homes or various buildings can be divided into oil boilers and gas boilers, depending on the fuel used. Gas boilers use LPG as a raw material, but most of them use LNG, which is clean fuel because it contains less sulfur than diesel and kerosene and minimizes air pollution. Doing.

In addition, gas boilers can be divided into various types according to the control method or the sealed state, and can be classified into condensing and non-condensing types according to the heat source for heating the heating water. It can be divided into the type of combustion and the type of downward combustion.

Among them, the condensing boiler is equipped with a sensible heat exchanger that directly heats the heating water by using the heat burned by the burner, and a latent heat exchanger that heats the heating water by using the latent heat of the exhaust gas passing through the sensible heat exchanger. Non-condensing boilers do not have a latent heat exchanger. Therefore, the condensing boiler is used for heat exchange even in the latent heat of the exhaust gas, so that the thermal efficiency is higher than that of the non-condensing boiler.

Figure 1 shows an example of a condensing boiler of the downward combustion method, such a condensing boiler is well disclosed in Korea Utility Model Model No. 225862.

As shown in FIG. 1, the condensing boiler includes a boiler case having an intake duct 11 that sucks external air according to the operation of the blower 20 and an exhaust duct 12 that discharges the burned exhaust gas to the outside. 10); A burner 21 which burns a mixture of gas and air sucked by the blower 20; A heating water heat exchanger (40) having a sensible heat exchanger (41) and a latent heat exchanger (42) to heat the heating water by the combustion heat of the burner (21) and to send it to the heating pipe; A hot water heat exchanger 60 for making the direct water into hot water by heat exchange between the heating water passed through the heating water heat exchanger 40 and the direct water supplied; A circulation pump 50 circulating the heating water; Three-way valve 51 for selectively switching the flow path of the heating water toward the hot water heat exchanger (60); And an expansion tank 70 for storing a portion of the heating water.

According to the condensing boiler described above, the exhaust gas is deprived of the temperature by heat exchange with the heating water while passing through the sensible heat exchanger 41 of the heating water heat exchanger 40, and then the heating water and the heating water are passed through the latent heat exchanger 42. By the heat exchange of the exhaust gas is condensed water is generated by condensation below the dew point temperature, the exhaust gas in the condensate receiver 31 installed in a structure separated from the heating water heat exchanger 40 in the lower portion of the latent heat exchanger (42). It is discharged to the outside through the condensate outlet 32, the exhaust duct 12 is connected to the upper end of the condensate receiver (31).

However, in such a condensing boiler, since the condensate receiver 31 is configured separately from the heating water heat exchanger 40 and should be coupled in a gas tight structure to the combustion chamber case 30 in which the heating water heat exchanger 40 is built, As additional parts such as packings are required to prevent the leakage of gas, the manufacturing cost of the boiler increases. In addition, since the condensate receiver 31 occupies a considerable amount of space, the size of the combustion chamber case 30 is increased, and thus the space utilization inside the boiler case 10 is reduced. This problem is similarly observed in condensing boilers of upstream combustion as well as in condensing boilers of upstream combustion.

The present invention has been made in consideration of the above-described conventional problems, and by integrating the condensate receiver between the sensible heat exchanger and the latent heat exchanger, as well as the exhaust guide, it is possible to reduce the size and to be used in the case of a separate type. It is an object of the present invention to provide a heat exchanger for a condensing boiler that can reduce manufacturing costs by eliminating the structure of packings and the like.

In order to achieve the above object, the heat exchanger for condensing boiler according to the present invention, the heating water return port formed in any one of both the support plate, the upper water pocket formed with a plurality of water pockets, the heating water formed in any one of the water pockets below A heat exchanger case having a discharge port, a front plate and a rear plate connecting front and rear ends of the support plate; A latent heat exchanger installed to communicate with the upper water pocket inside the upper end of the heat exchanger case; A sensible heat exchanger installed under the latent heat exchanger to communicate with the water pocket of the lower portion; A condensate receiver installed between the latent heat exchanger and the sensible heat exchanger and inclined upwardly toward the rear plate from the front plate to partially partition between the latent heat exchanger and the sensible heat exchanger; A condensate outlet formed outside the heat exchanger case to communicate with a space on an upper surface of the condensate receiver; And an exhaust guide bent obliquely toward the lower side of the condensate outlet at the upper portion of the latent heat exchanger.

At this time, it is preferable that the heat exchanger case, latent heat exchanger, sensible heat exchanger, condensate receiver, condensate outlet and exhaust guide are integrally brazed.

In addition, both water pockets of the heat exchanger case may be connected by a plurality of capillary pipes arranged in a horizontal structure, the sensible heat exchanger and the latent heat exchanger can be configured.

In addition, the diameter of the capillary pipe for the latent heat exchanger is preferably smaller than the diameter of the capillary pipe for the sensible heat exchanger.

In addition, the tubular pipe adjacent to the front plate or the back plate of the heat exchanger case is preferably partially brazed to the front plate or the back plate along its longitudinal direction.

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

2 to 5 show a heat exchanger for a condensing boiler according to the invention.

The heat exchanger for the condensing boiler according to the present invention is of an upward combustion method, and includes a heat exchanger case 100, a sensible heat exchanger 120, a latent heat exchanger 130, a condensate receiver 140, a condensate outlet 141, And an exhaust guide 150.

5 and 7, the heat exchanger case 100 is opened such that a lower portion thereof is coupled to the burner 160 of the condensing boiler, and an upper portion thereof is combusted by the burner 160. Is opened to discharge it. In order to collect and discharge the exhaust gas discharged to the upper portion of the heat exchanger case 100, an exhaust duct 110 for collecting and discharging the exhaust gas is coupled to the upper portion of the heat exchanger case 100. In addition, since the burner 160 is coupled to the lower portion of the heat exchanger case 100, the latent heat exchanger 130 occupies an inner region of the upper end of the heat exchanger case 100 adjacent to the exhaust duct 110. Is configured to, the sensible heat exchanger 120 is configured below the latent heat exchanger (130).

The heat exchanger case 100 may include both support plates 101 and 101 having a plurality of water pockets 102 formed in predetermined paths, and a front plate 105 and a rear surface connecting the front and rear ends of the support plates 101, respectively. Plate 106.

In addition, any one of the water pockets 102 of the water heat exchanger 120 side of the water pockets 102 is provided with a heating water outlet 104 for discharging the heating water, the latent heat of the water pockets 102 One of the water pockets 102 on the side of the exchanger 130 is provided with a heating water return port 103 for introducing the returned heating water.

In the present invention, it is illustrated that the heating water outlet 104 is installed in any one of the lowermost water pockets 102 and the heating water return port 103 is installed in any one of the uppermost water pockets 102.

In the heat exchanger case 100, the latent heat exchanger 130 and the sensible heat exchanger 120 are formed by a plurality of capillary pipes 121 and 131 arranged to connect the two water pockets 102 and 102 in a horizontal structure. Is composed. That is, the customs pipes 121 and 131 which connect them through the water pockets 102 in a zigzag path are sequentially connected from the heating water return port 103 to the heating water discharge port 104, and the latent heat exchanger 130. The sensible heat exchanger 120 is configured.

In addition, the diameter of the capillary pipe 131 for the latent heat exchanger 130 is preferably smaller than the diameter of the capillary pipe 121 for the sensible heat exchanger (120). The heat of the gas burned by the burner 160 is directly applied to the tubular pipes 121 and 131 of the sensible heat exchanger 120, and the exhaust gas passing through the sensible heat exchanger 120 is the latent heat exchanger 130. After considering the area and heat exchange efficiency of the latent heat exchanger 130 in contact with the exhaust gas, it is considered that the diameter of the capillary pipe 131 of the latent heat exchanger 130 is advantageous. In addition, in the case of the capillary pipe 121 constituting the sensible heat exchanger 120, a different diameter may be applied depending on the path, and the cross section, a long hole type, and the like may be selectively applied.

On the other hand, the exhaust gas is condensed below the dew point temperature by heat exchange with the heating water flowing in the latent heat exchanger 130 in the process of passing through the latent heat exchanger 130, condensed water is generated, in order to effectively collect and remove the condensate The condensate receiver 140 is installed at a position between the latent heat exchanger 130 and the sensible heat exchanger 120.

As shown in FIG. 5, the condensate receiver 140 is disposed between the latent heat exchanger 130 and the sensible heat exchanger 120 from the front plate 105 of the heat exchanger case 100. It is installed to be inclined upward toward the back plate 106 of the), and partially partitions the space between the latent heat exchanger 130 and the sensible heat exchanger 120, approximately 2/3 of the total thickness of the heat exchanger case 100. Preferably, it extends obliquely upward to the ˜3 / 4 position. Therefore, in the region where the exhaust guide 150 is not located in the space between the latent heat exchanger 130 and the sensible heat exchanger 120, the exhaust gas flowing from the sensible heat exchanger 120 to the latent heat exchanger 130. It functions as the passage P1.

In addition, in order to discharge the condensed water falling on the condensate receiver 140 to the outside of the heat exchanger case 100, one side support plate of the heat exchanger case 100 to communicate with the space on the upper surface of the condensate receiver 140 ( 101, the condensate outlet 141 is formed to the outside.

Meanwhile, the exhaust guide 150 passes through the entire area of the latent heat exchanger 130 to the exhaust duct 110 while preventing the exhaust gas flowing into the latent heat exchanger 130 from immediately exiting the exhaust duct 110. To exit.

To this end, the exhaust guide 150, in the rear plate 106 of the heat exchanger case 100 corresponding to the exhaust gas passage (P1) formed between the latent heat exchanger 130 and the sensible heat exchanger 120. The upper end of the latent heat exchanger 130, the end is installed so as to bend downward to the lower side of the condensate outlet 141, that is to the front plate 105. Accordingly, an exhaust gas passage P2 may be formed between the obliquely curved portion of the exhaust guide 150 and the heat exchanger case 100, and the exhaust gas passage P2 may communicate with the exhaust duct 110. As a result, the exhaust gas after the heat exchange with the latent heat exchanger 130 may be discharged through the exhaust duct 110. In order to more effectively delay the discharge of the exhaust gas, the exhaust gas passage P2 is preferably formed in the shape of a grille.

According to the present invention, the heat exchanger case 100, the latent heat exchanger 130, the sensible heat exchanger 120, the condensate receiver 140, the condensate outlet 141 and the exhaust guide 150 are integrally brazed. desirable. In the case of brazing, since the brazing material is inserted into the joining part or the brazing material is applied, and the assembly is heated in a vacuum furnace or the like, the general method can be performed. Thus, the heat exchanger of the present invention can be simply manufactured. .

In addition, the capillary pipes 131 and 121 of the latent heat exchanger 130 and the sensible heat exchanger 120 may be adjacent to the front plate 105 or the rear plate 106 of the heat exchanger case 100. As shown in FIG. 6, it is preferable to be brazed to the front plate 105 and the back plate 106 partially along its longitudinal direction.

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

When the condensing boiler is configured and operated by combining the burner 160 with the heat exchanger of the present invention, the gas is ignited by the burner 160 to heat the inside of the heat exchanger case 100, and the heating is performed from a heating pipe line or a hot water heat exchanger. Water is introduced into the latent heat exchanger 130 through the heating water return port 103. The heating water is discharged in a heated state through the latent heat exchanger 130, the sensible heat exchanger 120, and the heating water discharge port 104. The heated heating water is sent to a heating pipe line to be used for heating, or supplied to a hot water heat exchanger (not shown) to be used for heat exchange to convert direct water into hot water, and then return to the heating water return path.

In the flow of the heating and heating water, since the heating water passing through the sensible heat exchanger 120 is heated by direct heat by gas combustion, the exhaust gas is cooled in the state where the sensible heat exchanger 120 and the latent heat exchanger 130 are separated. It flows toward the latent heat exchanger 130 through the exhaust gas passage (P1) between. The exhaust gas is guided by the condensate receiver 140 and the exhaust guide 150 to pass through the entire region of the latent heat exchanger 130 and through the exhaust gas passage P2 formed by the end of the exhaust guide 150. It flows to the exhaust duct 110 and is discharged.

As the exhaust gas passes through the latent heat exchanger 130, condensate is generated as the exhaust gas condenses below the dew point temperature, and the condensate falls to the condensate receiver 140 and is discharged through the condensate outlet 141. .

According to the heat exchanger for condensing boiler according to the present invention configured as described above, the condensate receiving 140 is installed in an integrated structure between the latent heat exchanger 130 and the sensible heat exchanger 120, the overall size of the heat exchanger for condensing boiler It can be compact, thereby ensuring a wide space inside the boiler case can increase the space utilization or reduce the size of the boiler case.

In addition, since each component constituting the heat exchanger is integrated by brazing, there is no need to apply a coupling structure or packings to prevent leakage of exhaust gas, thereby simplifying the structure, manufacturing convenience, and reducing manufacturing cost due to parts reduction. Can be planned.

Claims (5)

Both support plates 101 and 101 having a plurality of water pockets 102 formed therein, a heating water return hole 103 formed at any one of the upper water pockets, and a heating water outlet 104 formed at any one of the lower water pockets, A heat exchanger case (100) having a front plate (105) and a rear plate (106) connecting front and rear ends of the support plate; A latent heat exchanger (130) installed inside the upper end of the heat exchanger case to communicate with the upper water pocket; A sensible heat exchanger (120) installed under the latent heat exchanger to communicate with the water pocket of the lower portion; A condensate receiver 140 installed between the latent heat exchanger and the sensible heat exchanger to be inclined upwardly toward the rear plate from the front plate to partially partition between the latent heat exchanger and the sensible heat exchanger; A condensate outlet 141 formed outside the heat exchanger case to communicate with a space on an upper surface of the condensate receiver; And And an exhaust guide (150) bent obliquely toward the lower side of the condensate outlet at the top of the latent heat exchanger. The method of claim 1, The heat exchanger case 100, the latent heat exchanger 130, the sensible heat exchanger 120, the condensate receiver 140, the condensate outlet 141, and the exhaust guide 150 are integrally brazed. group. The method according to claim 1 or 2, Both water pockets 102 of the heat exchanger case 100 are connected by a plurality of tubular pipes 121 and 131 arranged in a horizontal structure, whereby the sensible heat exchanger 120 and the latent heat exchanger 130 are configured. Heat exchanger for condensing boiler, characterized in that. The method of claim 3, The diameter of the capillary pipe 131 for the latent heat exchanger 130 is smaller than the diameter of the capillary pipe 121 for the sensible heat exchanger 120, heat exchanger for condensing boiler. The method of claim 3, Adjacent to the front plate 105 and the back plate 106 of the heat exchanger case 100 of the tubular pipe (121, 131) is partially brazed to the front plate and the back plate along the longitudinal direction Heat exchanger for condensing boiler, characterized in that.

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