KR20190132043A - Latent heat exchanger and condensing combustion apparatus having the same - Google Patents

Abstract

The present invention relates to a latent heat exchanger and a condensing type combustion apparatus having the same and, more specifically, to a latent heat exchanger and a condensing type combustion apparatus having the same, wherein the latent heat exchanger is provided in the condensing type combustion apparatus. The latent heat exchanger comprises: a first tube including a first area with a surface to which a plurality of heat exchange pins are coupled and a second area extending from one side of the first area and arranged on a combustion gas flow path in which combustion gas passing through a sensible heat exchanger flows, and enabling a heat medium to flow along the inside of the first tube; and a second tube for covering the second area and forming an air insulation layer between the first tube and the second tube.

Description

LATENT HEAT EXCHANGER AND CONDENSING COMBUSTION APPARATUS HAVING THE SAME}

The present invention relates to a latent heat exchanger and a condensing type combustion device including the same, and more particularly, a latent heat exchanger and a condensing type combustion device including the same, which improve the durability and performance of the combustion device product due to condensate. It is about.

In general, a combustion device such as a boiler or a water heater is a device that can be used for indoor heating or hot water by heating the heat medium using the heat of combustion generated during the combustion process and circulating the heated heat medium along the pipe.

In recent years, combustion apparatuses have a sensible heat exchanger that absorbs the sensible heat of the combustion gas generated in the combustion chamber to increase thermal efficiency, and a latent heat exchanger that absorbs the latent heat of condensation of water vapor contained in the combustion gas that has been heat-exchanged in the sensible heat exchanger. It is comprised by the condensing system provided.

Such a condensing type combustion device is classified into a downward combustion type and an upward combustion type based on the burning direction of the burner. Downward combustion has the advantage of recovering the latent heat as much as the flow direction of the combustion gas and the falling direction of condensate naturally, but the burner capable of downcoming combustion has low combustion stability and expensive control to implement complicated combustion control. The disadvantage is that the system is used.

On the contrary, the upward combustion type has the advantage of being able to use a Bunsen burner having a high combustion stability and a relatively low cost without being limited by the type of the burner. In the upward combustion type, the combustion gas passing through the sensible heat exchanger moves upward through the gas flow passage, which is deflected and narrowed to one side of the housing, and then flows into the latent heat exchanger. In addition, the condensate generated in the latent heat exchanger may be discharged to the outside through the condensate receiver.

By the way, according to the conventional upward combustion type, the condensed water may be generated in the portion of the tube of the latent heat exchanger exposed by the gas flow passage, but a large amount of condensate generated in the tube disposed in the gas flow passage falls downward to sensible heat exchange. May affect the atmosphere, the combustion chamber, the burner, and the like. Accordingly, a problem may occur that the durability and productability of the combustion device are degraded.

The present invention has been made to solve the above problems, and provides a latent heat exchanger and a condensing type combustion device having the same to minimize the condensate generated in the tube of the latent heat exchanger disposed on the flow path for the combustion gas flow. It aims to do it.

In addition, an object of the present invention is to provide a latent heat exchanger and a condensing type combustion device including the same, which improve durability and performance of a combustion device product due to condensate of the latent heat exchanger.

In order to achieve the above object, the latent heat exchanger according to the present invention includes a first region in which a plurality of heat exchange fins are coupled to a surface of the latent heat exchanger provided in a condensing combustion apparatus, and extends from one side of the first region. And a second region disposed on a combustion gas flow path through which the combustion gas passing through the sensible heat exchanger flows, wherein a heat medium flows along the inside, and surrounds the second region, It includes a second tube to form an air insulation layer in between.

In addition, the condensing combustion apparatus according to the present invention includes a burner, a sensible heat exchanger that absorbs the combustion sensible heat generated by the burner, and a latent heat exchanger that absorbs the latent heat of water vapor contained in the combustion gas passing through the sensible heat exchanger. The latent heat exchanger includes: a first region in which a plurality of heat exchange fins are coupled to a surface thereof, and a second gas disposed on a combustion gas passage through which the combustion gas flowing from one side of the first region and passing through the sensible heat exchanger flows. And a first tube including a region, the heat medium flowing along the inside, and a second tube surrounding the second region and forming an air insulation layer therebetween.

By using the latent heat exchanger and the condensing type combustion device having the same according to the present invention, it is possible to minimize the condensate generated in the tube of the latent heat exchanger disposed on the flow path through which the combustion gas flows.

Therefore, according to the present invention, it is possible to improve the deterioration of durability and performance of the combustor product by the condensed water of the latent heat exchanger.

1 is a cross-sectional view of a condensing combustion device according to the present invention.
FIG. 2 is an enlarged partial cross-sectional view of the sensible heat exchanger and the latent heat exchanger of FIG. 1; FIG.
3 is an enlarged cross-sectional view of a portion A of FIG. 2;
Figure 4 is a partially enlarged perspective view showing a second region of the latent heat exchanger applied to the present invention.
Figure 5 is a side cross-sectional view showing a side cross-sectional view of a latent heat exchanger according to the present invention.
FIG. 6 is an enlarged cross-sectional view of a portion B of FIG. 5.

Hereinafter, preferred embodiments of the present invention according to the accompanying drawings will be described in detail.

First, the embodiments described below are suitable for understanding the technical features of the latent heat exchanger and the condensing type combustion device having the same. However, the technical features of the present invention are not limited by the embodiments described or applied to the embodiments described below, and various modifications are possible within the technical scope of the present invention.

The condensing type combustion apparatus 1 according to the present invention heats the heating medium using the combustion heat generated during the combustion process, such as a boiler or a water heater, and circulates the heated heating medium along the pipe to be used for indoor heating or for hot water. Any device can be used without limitation.

1 and 2, the condensing combustion apparatus 1 according to the present invention according to an embodiment of the present invention is a burner 20, sensible heat exchanger 40, latent heat exchanger (50) It includes.

Burner 20 may generate combustion sensation by combustion. The burner 20 may be, for example, an upward combustion burner 20, a Bunsen burner for supplying the minimum primary air necessary for combustion to the nozzle unit and supplying excess secondary air to a portion where a flame is formed, Premixed burners may be used which pre-mix gas and air and then combust. However, the kind of burner 20 applied to the present invention is not limited to the above. In addition, a lower part of the burner 20 is provided with a blower 10 for supplying air for combustion, and an upper part of the burner 20 is provided with a combustion chamber 30 in which combustion occurs by the flame generated by the burner 20. Can be.

The sensible heat exchanger 40 absorbs the combustion sensible heat generated by the burner 20. Specifically, the sensible heat exchanger 40 is a sensible heat tube 43, the heat medium inlet tube through which the heat medium flows into the sensible heat tube 43, and the heat medium passing through the sensible heat exchanger 40 as a heating or hot water source. It may include a heat medium supply pipe to be supplied. A plurality of sensible heat tube 43 is disposed to be spaced apart in the front and rear direction, both sides of the sensible heat tube 43 may be provided with a flow path cap 44 for flowing the heat medium. Heat exchange fins 45 are closely spaced in the longitudinal direction of the sensible heat tube 43 on the outer surfaces of the plurality of sensible heat tubes 43.

The latent heat exchanger 50 absorbs the latent heat of water vapor contained in the combustion gas passing through the sensible heat exchanger 40. The latent heat exchanger 50 includes a first tube 51 through which a heat medium flows along the inside thereof. Specifically, the latent heat exchanger (50) is a heat medium return pipe through which the heat medium after the heating requirement or the hot water demand is recovered, and the heat medium via the latent heat exchanger (50) are connected to the sensible heat exchanger (40) through the connection pipe. The heat medium discharge pipe to be discharged may be provided. The combustion gas passing through the latent heat exchanger 50 may be discharged to the outside through the exhaust flue 60 provided above the latent heat exchanger 50.

A plurality of first tubes 51 may be disposed between the heat medium recovery pipe and the heat medium drain pipe at predetermined intervals in the front and rear directions. In addition, the plurality of first tubes 51 may be provided with a flow path cap 54 for flowing the heat medium.

The latent heat exchanger 50 and the sensible heat exchanger 40 may be configured as a fin-tube heat exchanger having a common structure. By constructing a fin-tube type heat exchanger having a common structure as described above, it is possible to reduce the inconvenience of separately producing the latent heat exchanger 50, and to miniaturize the latent heat exchanger 50.

In addition, as an example, the latent heat exchanger 50 and the sensible heat exchanger 40 may be formed to have the same width in the lateral direction (left and right directions in the drawing). Specifically, the lateral widths of the sensible heat exchanger 40 and the latent heat exchanger 50 including the plurality of flow path caps 44 and 54 are formed to have a size corresponding to the lateral width of the case of the combustion chamber 30. Can be.

Therefore, as shown in FIG. 1, since the entire appearance of the combustion chamber 30, the sensible heat exchanger 40, and the latent heat exchanger 50 of the combustion device is formed in a rectangular parallelepiped shape, the total volume of the combustion device is reduced. Since it can be manufactured in a regular cuboid shape, it is possible to reduce the constraint on the installation space of the combustion device, it is possible to increase the space utilization inside the combustion device. However, the shape and arrangement of the case, the latent heat exchanger 50 and the sensible heat exchanger 40 of the combustion chamber 30 are not limited to the illustrated embodiment, and various modifications are possible.

In addition, the sensible heat exchanger 40 may be made of stainless steel (STS) or copper (Cu) material, the latent heat exchanger 50 may be made of stainless steel (STS) material, the material of the heat exchanger as described above It is not limited.

1 and 2, one side of the latent heat exchanger 50 may be a combustion gas flow path S4 through which the combustion gas passing through the sensible heat exchanger 40 flows. For example, when the condensing type combustion device 1 according to the present invention is an upward combustion type, the combustion gas passing through the sensible heat exchanger 40 flows upward in the combustion gas flow path S4 and is a latent heat exchanger 50. ) Can be introduced into. Specifically, the combustion gas passing through the sensible heat exchanger 40 may enter the upper space S3 narrowing toward the upper side of the sensible heat exchanger 40. The upper end of the upper space (S3) is connected to the combustion gas flow path (S4) disposed on one side of the latent heat exchanger (50).

As described above, in the case of the combustion apparatus in which the lateral widths of the sensible heat exchanger 40 and the latent heat exchanger 50 are equal to each other and arranged up and down, the first tube 51 of the latent heat exchanger 50 is provided. The portion disposed on the combustion gas flow path S4 (hereinafter, the first region 50a) may be exposed on the combustion gas flow path S4.

More specifically, referring to FIG. 2, the first tube 51 includes a first region 50a and a second region 50b. A plurality of heat exchange fins 53 may be mounted on the first region 50a of the first tube 51 to be closely spaced apart in the longitudinal direction of the first tube 51. Here, the combustion gas which flowed into the middle part of the latent heat exchanger 50 which is the right side of the 1st area | region 50a can flow in the downward direction corresponded to the fall direction of condensate. In addition, a flow path S7 through which the combustion gas passing through the right side of the first region 50a flows upward and is exhausted may be formed at the other side of the latent heat exchanger 50 on the left side of the first region 50a. .

The flow path S7 through which the combustion gas on the left side of the first region 50a flows upward is formed smaller than the region in which the combustion gas on the right side of the first region 50a flows downward and the combustion gas passage S4. Can be. This is because the combustion gas passing through the flow path S7 on the left side of the first region 50a decreases in volume as the temperature decreases while passing through the intermediate portion of the latent heat exchanger 50, and thus, on the left side of the first region 50a. This is because even if the flow path S7 is formed small, it is not affected by the flow resistance.

However, the specific configuration of the first region 50a of the first tube 51 and the flow of the combustion gas are not limited to the above, and various modifications are possible.

The second region 50b of the first tube 51 is formed on the combustion gas flow path S4 in which the combustion gas that extends to one side of the first region 50a and passes through the sensible heat exchanger 40 flows upward. Is placed on. The heat exchange fins 53 may be coupled to the surface of the second region 50b of the first tube 51. However, preferably, in the second region 50b, the surface of the second region 50b may be heat-exchanged for easy coupling of the first tube 51 and the second tube 52, which will be described later, and reduction of condensation. The pin may not be coupled, but is not necessarily limited thereto.

However, condensed water due to the condensation of the combustion gas may occur on the surface of the first tube 51 located in the second region 50b, and the condensed water may fall downward in the combustion gas flow path S4, Problems that may flow into the installed sensible heat exchanger 40 and the burner 20, the blower 10, and the like may occur. In particular, since the combustion gas passing through the combustion gas flow path S4 is a high temperature state passing through the sensible heat exchanger 40, the combustion gas flow path S4 needs to be formed at a predetermined size or more because the volume is large. A large amount of condensed water may occur on the surface of the first tube 51 positioned at 50b).

The latent heat exchanger 50 according to the present invention may include a second tube 52 provided in the second region 50b. The second tube 52 may surround the second region 50b and form an air insulation layer 55 between the first tube 51 and the first tube 51.

Specifically, the first tube is installed in the second region 50b disposed on the combustion gas flow path S4 among the first tubes 51, and is spaced in the radial direction from the outer circumferential surface of the first tube 51. It may be provided to surround the 51. Accordingly, the air insulation layer 55 may be formed between the first tube 51 and the second tube 52.

Since the air provided between the first tube 51 and the second tube 52 has a lower thermal conductivity than the material constituting the first tube 51 (for example, stainless steel (STS)), the air insulation layer 55 ) May serve as a thermal insulator. This provides an excellent effect of minimizing the generation of condensate on the surface of the first tube 51.

Meanwhile, referring to FIGS. 4 to 6, the present invention may further include a gap maintaining protrusion 56. At least any one of an outer side surface of the first tube 51 and an inner side surface of the second tube 52 may maintain the gap between the first tube 51 and the second tube 52. It may be formed to protrude on one.

As an example embodiment, the gap maintaining protrusion 56 may be formed to protrude toward the first tube 51 on the inner side surface of the second tube 52. For example, the gap maintaining protrusion 56 may be formed by adding an emboss shape to the surface of the second tube 52. However, the position and shape of the space maintaining protrusion 56 is not limited to the illustrated embodiment, and may be formed to protrude on the outer circumferential surface of the first tube 51.

According to the present invention, since the gap between the first tube 51 and the second tube 52 is maintained by the gap maintaining protrusion 56, the air insulation layer 55 having a uniform thickness around the first tube 51 is provided. Can be secured.

More specifically, referring to FIGS. 3 to 5, the space maintaining protrusion 56 may be provided with a plurality of spaced apart along the circumferential direction of the inner surface of the second tube 52 and the longitudinal direction of the first tube 51. Can be. More preferably, the plurality of gap maintaining protrusions 56 may be formed to be spaced apart at regular intervals along the circumferential direction of the inner surface of the second tube 52 and the longitudinal direction of the first tube 51.

Accordingly, since the air insulation layer 55 is secured to a predetermined thickness or more on the entire surface of the first tube 51, it is possible to maximize the prevention effect of condensate on the surface of the first tube 51.

Meanwhile, the second tube 52 may be assembled to surround the first tube 51 by inserting a locking portion formed at the other end into an insertion groove formed at one end thereof.

Specifically, the second tube 52 may be manufactured in the form of a tube by processing the plate-like member, and may form insertion grooves and engaging portions at both ends of the plate-shaped member. The second tube 52 can be assembled by wrapping the second tube 52 on the outside of the first tube 51 and inserting the locking portion into the insertion groove.

Meanwhile, referring to FIGS. 3 and 4, the present invention includes a partition plate 57 vertically provided between the first region 50a and the second region 50b and through which the first tube 51 passes. 1 may further include an end plate 58 installed at one end of the tube 51.

In addition, the second tube 52 may be provided between the partition plate 57 and the end plate 58. In addition, the present invention may further include a packing part 59 provided at both ends to seal between the second tube 52 and the partition plate 57 and between the second tube 52 and the end plate 58. Can be.

Specifically, the packing part 59 packs both ends of the second tube 52 to further enhance the heat insulating performance of the air insulation layer 55 and at the same time, condensed water condensed on the surface of the first tube 51. Leakage can be prevented downward. The structure and material of the packing part 59 are not limited, and various structures and materials may be applied as long as both ends of the second tube 52 may be sealed.

Meanwhile, referring to FIGS. 1 and 2, the present invention may further include a condensate discharge unit 70. The condensate discharge unit 70 may be provided between the sensible heat exchanger 40 and the latent heat exchanger 50 to induce discharge of the condensate generated in the latent heat exchanger 50.

Specifically, the condensed water discharge unit 70 is disposed inclined at the upper end of the other side of the sensible heat exchanger 40 and the lower end of one side of the first region 50a of the latent heat exchanger 50, and passes through the sensible heat exchanger 40. One combustion gas may be directed toward one side of the latent heat exchanger 50, and the condensed water discharged from the first region 50a of the latent heat exchanger 50 may be discharged.

The condensate discharge unit 70 is inclinedly disposed at an upper end of the other side of the sensible heat exchanger 40 and a lower end of one side of the first region 50a of the latent heat exchanger 50, and thus sensible heat exchanges the condensed water generated in the first region 50a. It can be discharged to the outside through the other side of the top 40. Accordingly, condensed water may not flow into the sensible heat exchanger 40 in the lower portion of the first region 50a.

In addition, through the inclined form, the upper space S3 of the sensible heat exchanger 40 may be formed to become narrower toward the upper side, and the combustion gas entering the upper space may be the combustion gas flow path S4. Can be induced.

That is, the condensate discharge unit 70 has a function of inducing condensate generated in the latent heat exchanger 50 to be discharged to the outside, and the latent heat exchanger 50 passing combustion gas flowing upward through the sensible heat exchanger 40. At one side of the combustion gas flow path (S4) can be performed simultaneously.

On the other hand, the condensing combustion device 1 applied to the present invention may include a flow guide member (80). The flow path guide member 80 is provided between the latent heat exchanger 50 and the exhaust flue 60, and flows upward through the combustion gas flow path S4 disposed on one side of the latent heat exchanger 50. The combustion gas may be directed toward the middle portion of the latent heat exchanger 50, which is one side of the first region 50a.

The flow guide member 80 may be fixed to the bottom surface of the upper cover 61 provided in the exhaust flue 60, and may be firmly supported by being coupled to the first tube 51 of the latent heat exchanger 50. An upwardly convex flow path switching space S5 may be formed between the upper cover 61 and the flow guide member 80 of the exhaust flue 60.

Through the flow path switching space (S5), the combustion gas moved upward to the combustion gas flow path (S4) can be evenly distributed downward flow toward the middle portion of the latent heat exchanger (50). Accordingly, the flow resistance of the combustion gas passing through the intermediate portion of the latent heat exchanger 50 may be reduced and heat exchange efficiency may be improved.

Hereinafter, an example of the flow path of the combustion gas will be described with reference to FIG. 1. The air discharged to the outlet S1 of the blower 10 may be mixed with the combustion gas and combusted by ignition of the burner 20. The combustion gas generated in the burner 20 flows upward in the internal space S2 of the combustion chamber 30 and passes through the sensible heat exchanger 40 to transfer the combustion sensible heat to the heat medium.

Combustion gas entering the upper space (S3) of the sensible heat exchanger 40 is guided to one side by the condensate discharge unit 70 through the combustion gas flow path (S4) located on one side of the latent heat exchanger (50) Can flow in a direction. At this time, it is possible to minimize the generation of condensed water in the second region 50b of the first tube 51 disposed in the combustion gas flow path S4 by the combustion gas through the second tube 52.

The combustion gas passing through the combustion gas flow path S4 flows into the space S5 between the latent heat exchanger 50 and the exhaust flue 60, and the flow direction is changed by the flow path guide member 80, thereby changing the latent heat exchanger ( It can flow downward through the middle of 50). At this time, in the middle portion of the latent heat exchanger 50, the flow direction of the combustion gas is directed downward to coincide with the direction in which the condensate falls, thereby minimizing contact between the combustion gas and the condensate to increase the amount of condensation of moisture contained in the combustion gas. By maximizing the latent heat recovery efficiency.

The combustion gas flowing into the lower space S6 of the middle portion of the latent heat exchanger 50 is led to the other side by the condensate discharge unit 70 and passes through the space S7 located on the other side of the latent heat exchanger 50. It can flow upward. At this time, the combustion gas flowing upward may enter the space (S8) between the latent heat exchanger (50) and the upper cover of the exhaust flue 60 may be discharged to the outside through the exhaust flue (60).

By using the latent heat exchanger and the condensing type combustion device having the same according to the present invention, it is possible to minimize the condensate generated in the tube of the latent heat exchanger disposed on the flow path through which the combustion gas flows. Therefore, according to the present invention, it is possible to improve the deterioration of durability and performance of the combustor product by the condensed water of the latent heat exchanger.

Although specific embodiments of the present invention have been described above, the spirit and scope of the present invention are not limited to these specific embodiments, and are described in the claims by those skilled in the art. Various modifications and variations are possible without departing from the spirit of the invention.

1: Condensing Combustor 10: Blower
20: burner 30: combustion chamber
40: sensible heat exchanger 43: sensible tube
45: heat exchange fin 50: latent heat exchanger
50a: first region 50b: second region
51: first tube 52: second tube
53: heat exchange fin 54: euro cap
55: air insulation layer 56: gap maintaining projection
57: bulkhead plate 58: end plate
59: packing part 60: exhaust flue
70: condensate discharge portion 80: flow guide member

Claims (9)

In a latent heat exchanger provided in a condensing combustion device,
A first region having a plurality of heat exchange fins coupled to a surface thereof, and a second region extending from one side of the first region, the second region being disposed on a combustion gas passage through which the combustion gas passing through the sensible heat exchanger flows. A first tube flowing along the inside; And,
And a second tube surrounding the second region and forming an air insulation layer between the first tube and the first tube. The method of claim 1,
A latent heat exchanger, further comprising a gap maintaining protrusion protruding from at least one of an outer surface of the first tube and an inner surface of the second tube to maintain a gap between the first tube and the second tube. group. burner;
A sensible heat exchanger for absorbing combustion sensible heat generated by the burner; And,
Including a latent heat exchanger for absorbing the latent heat of the water vapor contained in the combustion gas passing through the sensible heat exchanger,
The latent heat exchanger,
A first region in which a plurality of heat exchange fins are coupled to a surface thereof, and a second region extending from one side of the first region and disposed on a combustion gas passage through which combustion gas flows through the sensible heat exchanger, and the heat medium is internally provided. A first tube flowing along the; And,
And a second tube surrounding the second region and forming an air insulation layer between the first tube and the first tube. The method of claim 3,
The burner is an upward combustion burner,
Combustion gas passing through the sensible heat exchanger flows upward in the combustion gas flow path and flows into the latent heat exchanger. The method of claim 3,
The condensing method further includes a gap maintaining protrusion protruding from at least one of an outer side surface of the first tube and an inner side surface of the second tube so as to maintain a gap between the first tube and the second tube. Combustion apparatus. The method of claim 5,
The spacing holding projection is provided with a plurality of spaced apart in the circumferential direction of the inner surface of the second tube, the longitudinal direction of the first tube, condensing type combustion device. The method of claim 3,
And the second tube is assembled to surround the first tube by inserting a locking portion formed at the other end into an insertion groove formed at one end thereof. The method of claim 3,
A partition plate provided vertically between the first region and the second region and through which the first tube passes, and an end plate disposed at one end of the first tube;
The second tube,
It is provided between the partition plate and the end plate,
And a packing part provided at both ends to seal between the second tube and the partition plate and between the second tube and the end plate. The method of claim 3,
It is provided between the sensible heat exchanger and the latent heat exchanger, further comprising a condensate discharge unit for inducing discharge of the condensate generated in the latent heat exchanger,
The condensate discharge part is disposed to be inclined at an upper end of the other side of the sensible heat exchanger and a lower end of one side of the first region of the latent heat exchanger, to direct the combustion gas passing through the sensible heat exchanger toward one side of the latent heat exchanger. And condensate discharged from the first region of the latent heat exchanger.

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