KR100914753B1 - Duct assembly for flue - Google Patents

Abstract

A flue duct assembly is disclosed. The disclosed flue duct assembly includes an inner tube having flanges formed at both ends thereof so that a plurality of continuous butt-coupled and coupled exhaust gases are discharged, and fastening the flanges which are butted together to be assembled and connected to the plurality of inner tubes. 1. A flue duct assembly comprising a connecting band and an outer tube installed to cover an outer circumferential surface of the inner tube while maintaining a predetermined distance from the inner tube, wherein the flange is filled in the face of the flange gap which is joined to connect and assemble the inner tube. A first heat resistant sealant; A second heat resistant sealant filled between the groove of the first connection band and the outside of the flange while the flange is engaged; And an airtight guide ring which covers the space between the flanges formed between the flanges and is installed on the inner wall of the inner tube to maintain the airtightness in the gap.

According to the present invention, there is an advantage that can be prevented from leakage by condensed water and leakage by exhaust gas generated in the pipe connection.

Description

Duct assembly for flue {DUCT ASSEMBLY FOR FLUE}

The present invention relates to a duct assembly for flue, and more particularly, after constructing a flue used as an exhaust pipe for an industrial boiler, an absorption cold / hot water unit, a diesel generator, a turbine generator, a gas engine, and various vents. An improved flue duct assembly is provided to prevent leakage of exhaust gas and leakage of condensate at the connections (flanges) of the.

For example, a flue duct system for discharging exhaust gas (combustion gas) generated from large buildings such as an apartment or a factory is schematically illustrated in FIG. 1.

Referring to Figure 1, in general, the combustion gas (exhaust gas) generated by the operation of the boiler 7 in the building to be discharged to the outside of the building through the duct assembly (1, 2) consisting of a plurality of connected.

The duct assembly 1, 2 has a horizontal duct assembly 1 and a vertical duct assembly 2 depending on the installation state. Typically the horizontal duct assembly 1 and the vertical duct assembly 2 are combined to form a flue duct system as shown in FIG. 1.

And the fixed support (4,8) is fixed to the horizontal duct assembly 1 and the vertical duct assembly (2) to support the horizontal duct assembly (1) and the vertical duct assembly (2) do.

In FIG. 1, reference numeral 3 denotes a stack cap, reference numeral 5 denotes a check hole for inspecting the inside of the duct assembly 2, and reference numeral 9 denotes a duct assembly. To show the expansion valve installed on one side of the duct assembly (2) to vary the length of (2).

The configuration of the horizontal duct assembly 1 and the vertical duct assembly 2 is almost the same as will be described later.

Therefore, in FIG. 2, for example, the configuration of the vertical duct assembly 2 of the duct assemblies 1 and 2 of FIG. 1 will be described.

Referring to FIG. 2, the duct assembly 2 engages upper and lower (or front and rear) inner tubes 2b and 2b 'and flanges 2b-1 of inner tubes 2b and 2b'. A first connection band 2e used to cover the outer circumferential surfaces of the inner tubes 2b and 2b 'and outer tubes 2a and 2a' installed at regular intervals outside the inner tubes 2b and 2b '; And a second connection band 2d provided to fasten the outer tubes 2a and 2a '.

In addition, spacers (2c, 2c ') are provided between the outer tubes (2a, 2a') and the inner tubes (2b, 2b ') to support them and maintain their spacing constant. At this time, an air layer of about 25 mm is formed between the outer diameter O.D and the inner diameter I.D by the spacers 2c and 2c '.

Thus, the duct assembly 2 of FIG. 2 forms a kind of double tube consisting of the outer tubes 2a and 2a 'and the inner tubes 2b and 2b'.

3 shows another embodiment of a duct assembly.

In the duct assembly 6 of FIG. 3, the intermediate tubes 6g and 6g 'are provided between the inner tubes 2b and 2b' and the outer tubes 6a and 6a ', and the spacers 2c and 2c are disposed between them. ', 6b, 6b') is provided. In addition, a first connection band 2e for fastening the inner tubes 2b and 2b 'and a second connection band 6d for fastening the outer tubes 6b and 6b' are provided.

In this case, the spacers 2c, 2c ', 6b, and 6b' each have a diameter of about 25 mm between the outer diameter OD and the intermediate diameter MD and between the intermediate diameter MD and the inner diameter ID. All about 50 mm).

Thus, the duct assembly 6 of FIG. 3 forms a kind of triple tube consisting of outer tubes 6a and 6a ', intermediate tubes 6g and 6g', and inner tubes 2b and 2b '.

In the duct assemblies 2 and 6 configured as described above, the circumferential portion A of the first connection band 2e, which is a type of V-band, which fastens the flanges 2b-1 of the inner tubes 2b and 2b ', respectively, is An enlarged detail is shown in FIG. 4.

Referring to FIG. 4, before fastening the flanges 2b-1 of the inner tubes 2b and 2b ', a heat-resistant sealant 2f is filled in the first connection band 2e to increase the fastening force. Alternatively, the exhaust gas passing through (flowing) the duct assemblies 2 and 6 is not leaked, and condensed water formed in the inner wall of the duct assemblies 2 and 6 is not leaked.

And the first connection band (2e) is finally fastened by a fastening member (2h) consisting of a bolt and a nut, the inner tube (2b, 2b ') is tightly coupled. In addition, the external pipes 2a, 2a ', 6a, and 6a' are also fastened by the second connection bands 2d and 6d and the fastening member 2h, thereby assembling the duct assemblies 2 and 6 of the double pipe or the triple pipe. Is done.

The duct assemblies 2 and 6 configured as described above are generally made of stainless steel having excellent corrosion resistance, and are connected to the exhaust gas outlet of the basement heat source equipment (for example, a boiler) and connect these assemblies 2 and 6 to each other. Assemble a plurality of vertically or horizontally to connect to the rooftop to exhaust the exhaust gas.

By the way, in the past, the temperature of the exhaust gas flowing inside the duct assembly was used at about 200 ° C. to 250 ° C. or less, so that very little internal condensate was generated. However, waste heat recovery devices are installed in current heat source equipment (eg, boilers). As the exhaust gas temperature is 100 ° C to 150 ° C, a large amount of self-condensate is generated.

In addition, if the waste heat recovery system is not applied to the diesel generator and gas turbine generator equipment, the exhaust gas temperature is discharged over 300 ° C to 600 ° C. At the same time, the pressure inside the duct assembly 2 and 6 is increased by high speed forced exhaust, It is emphasized.

In response to this, as described above, the airtight sealant 2f is simply maintained in the first connection band 2e, which is a V-band, so that it is not possible to come up with an improvement plan suitable for the conditions at this time, and thus serious problems such as leakage and leakage. Indicates.

Specifically, even when the first connection band 2e is fastened, there is a gap C between the flanges 2b-1, as shown in FIG. 4, whereby a plurality of duct assemblies 2 and 6 are assembled. In this state, a gap occurs inside the groove of the first connecting band 2e at the moment of vibration, external shock, or air expansion inside the tube at the moment of movable ignition of the equipment.

This phenomenon repeatedly proceeds to reduce the adhesive force of the heat resistant sealant 2f, and the heat resistant sealant 2f is cured by the exhaust gas of a high temperature to be crushed to reduce the airtight performance. At this time, leakage of exhaust gas and leakage of condensate occur.

At present, even when the above problems (leakage, leakage) can be predicted, there is a lack of efforts to improve the problems, and thus the construction is proceeding according to the existing method. As a result, defects on leakage and leakage are frequently performed during commissioning or use after completion of construction, resulting in economic loss and customer complaints.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a flue duct assembly to prevent leakage and leakage occurring inside the duct assembly.

In order to achieve the above object, the flue duct assembly of the present invention includes an inner tube having flanges formed at both ends thereof so that a plurality of continuous butt-to-butes are coupled to exhaust gas, and the plurality of inner tubes are connected and assembled. In the duct assembly for the flue provided with a first connection band for fastening the flanges to each other and the outer tube installed to surround the outer circumferential surface of the inner tube while maintaining a predetermined distance from the inner tube, the inner tube is connected and assembled A first heat resistant sealant filled in the flange gap face which is opposed to each other; A second heat resistant sealant filled between the groove of the first connection band and the outside of the flange while the flange is engaged; And an airtight guide ring which covers the space between the flanges formed between the flanges and is installed on the inner wall of the inner tube to maintain the airtightness in the gap.

According to an embodiment of the present invention, by installing the airtight guide ring to maintain the airtight on the inner wall inner wall between the flanges while the inner pipes are assembled with each other, the gap between the flanges are covered, thereby maximizing the airtightness of the gaps do.

Therefore, it is possible to prevent leakage due to exhaust gas and leakage due to condensate, thereby minimizing the maintenance of flue duct assembly and reducing the cost of maintenance, which is economical and improves customer reliability of the product. .

1 is a schematic view schematically showing the configuration of a typical flue duct system.

Figure 2 shows in more detail the configuration of one embodiment of the flue duct assembly of Figure 1;

3 is a view showing in more detail the configuration of another embodiment of the flue duct assembly of FIG.

4 is an enlarged detailed cross-sectional view showing an enlarged portion 'A' of FIGS. 2 and 3.

5 is a view showing the configuration of an embodiment of the flue duct assembly according to the present invention.

6 is a view showing the configuration of another embodiment of the flue duct assembly according to the present invention.

FIG. 7 is an enlarged detailed cross-sectional view showing a portion 'B' of FIG. 5 and FIG.

8 is a partial cross-sectional view showing the configuration of FIG. 7 as a whole.

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

10. Duplex Duct Assembly

12,12 '. Inner tube

12a. flange

15. First connection band

33,33 '. Middle tube

21. First heat resistant sealant

22. Second heat resistant sealant

23. Confidential Guide Ring

30. Triple Tube Duct Assembly

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 5 is a block diagram showing the configuration of a double duct assembly for flue in one embodiment according to the present invention.

Referring to the drawings, the dual duct assembly 10 for flue according to the present invention, the flange 12a at the upper end and the lower end (both ends) so that a plurality of them are continuously coupled to the exhaust gas flowing in the combustion gas is discharged therein. Formed inner tubes 12 and 12 ', a first connecting band 15 for fastening the flange 12a of the inner tubes 12 and 12', and outer peripheral surfaces of the inner tubes 12 and 12 '. The outer pipes 11 and 11 'installed at regular intervals on the outside of the inner pipes 12 and 12', and the second connection band 14 installed to fasten the outer pipes 11 and 11 '. It is installed between the outer tube (11, 11 ') and the inner tube (12, 12') to support them (11, 11 ', 12, 12') and at the same time (11, 11 ', 12, 12') Spacers (13, 13 ') are provided to keep the spacing constant.

At this time, an air layer of about 25 mm is formed between the outer diameter O.D and the inner diameter I.D by the spacers 13 and 13 '.

6 is a block diagram showing the configuration of the triple duct assembly for the flue in another embodiment according to the present invention.

In the triple duct assembly 30 for flue according to the present invention, intermediate pipes 33 and 33 'are installed between the inner pipes 12 and 12' and the outer pipes 31 and 31 ', respectively, with spacers therebetween. (13, 13 ', 35, 35') are provided.

In addition, a first connection band 15 and a second connection band 36 are installed to fasten the inner tube 12 and 12 'and the outer tube 31 and 31'.

At this time, the spacers 13, 13 ', 35, and 35' are each approximately 25 mm between the outer diameter OD and the intermediate diameter MD and between the intermediate diameter MD and the inner diameter ID. Air layer is formed.

The inner tubes 12 and 12 'are formed by using a stainless steel plate having a thickness of 0.8 to 2.0 mm, and the flange 12b is 90 to about 10 to 12 mm at both ends of the inner tubes 12 and 12'. Also bent to form.

In addition, connecting bands 14 and 36 are installed to fasten the outer tubes 11, 11 ', 31, and 31' in FIGS. 5 and 6, wherein the connecting bands 14 and 36 are bolts and nuts. The fastening member 16 made up is used and fastened.

The circumferential portion B of the first connection band 15, which is a type of V-band, which fastens the flange 12a of the inner tube 12, 12 'in the duct assembly 10, 30 configured as described above, is described in detail. The detailed view shown is shown in FIG. 7.

That is, it can be seen that the flue duct assembly according to the present invention is applied regardless of the double pipe duct assembly 10 or the triple pipe duct assembly 30.

Referring to Figure 7, the flue duct assembly (10,30) according to the present invention, the gap (C; Fig. 4) between the inside of the flange 12a abutted to each other for assembling the inner tube (12, 12 ') The first heat-resistant sealant 21 filled with the first connection band 15 and the first connection band 15 to the flange 12a of the inner tubes 12 and 12 '. Between the V-groove 15a and the second heat resistant sealant 22 filled outside the flange 12a of the inner tubes 12 and 12 ', and the inner tube 12 is joined to the flange 12a. It is provided on the inner wall surface of the inner tube (12, 12 ') of the airtight guide ring 23 is provided to cover the gap (C) between the flange (12a) to maintain the airtight of the gap (C).

At this time, the hermetic guide ring 23 is made of stainless steel that is the same material as the inner tubes (12, 12 '). And the airtight guide ring 23 is made of a stainless steel plate having a thickness of 1.0mm or more that can be easily welded, the height is 100mm from the minimum height to cover the gap (C) between the flange (12a) It consists of the following.

The hermetic guide ring 23 is also attached by, for example, argon welding, suitable for welding stainless steel material.

The first and second heat resistant sealants 21 and 22 use heat resistant silicon. However, the present invention is not limited to this.

Referring to the operation of the flue duct assembly according to the present invention having the configuration as described above are as follows.

Referring again to the drawings, the inner tubes 12, 12 'of the flue duct assembly 10, 30 according to the invention are made by forming a stainless steel sheet into a circular tube, in particular the inner tubes 12, 12'. Both ends of the bent by 90 degrees to form a flange (12a).

In addition, a 25 mm air layer is formed on the outer circumferential surface of the inner tube 12 and 12 ′, and only the outer tube 11 and 11 ′ is installed on the outer circumferential surface to form a double tube of FIG. 5, and the inner tube 12 and 12 ′. Two pipes, that is, intermediate pipes (33, 33 ') and outer pipes (31, 31') are installed in the outer peripheral surface of the triple pipe.

In addition, the hermetic guide ring 23 is attached to the inner circumferential surface of the inner tubes 12 and 12 'by a stainless steel plate by argon welding w1 and w2.

The first heat resistant sealant 21 is first filled in the gap C surface of the flange 12a of the inner tube 12 and 12 'to which the airtight guide ring 23 is attached. In addition, the second heat-resistant sealant 22 is secondarily filled in the first connection band 15 having the V-groove 15a to form a circle.

Then, the flange 12a of the inner tube 12, 12 'is attached to the V-groove 15a of the first connection band 15 with the airtight guide ring 23 attached thereto, and is formed of a bolt and a nut at one side. Tighten with the fastening member 16 to assemble the inner tube (12, 12 ').

As such, the first and second heat resistant sealants 21 and 22 are respectively filled twice and the inner tubes 12 and 12 'are assembled to maximize the function of the first and second heat resistant sealants 21 and 22. This improves airtightness.

Then, the connection point of the double pipe of FIG. 5 is filled with the second connection band 14 or the connection point of the triple pipe of FIG. 6 with the second connection band 36 to complete the assembly.

The completed duct assembly (10,30) is connected to the exhaust gas outlet of the basement heat source equipment, it is connected to the rooftop floor so that the exhaust gas is discharged.

On the other hand, as described above, when the hot exhaust gas flows inside the inner tube (12, 12 ') after the flue construction, the flange is expanded in the flange 12a portion of the inner tube (12, 12') connection to each other The clearance C of 12a is opened.

In this case, as shown in FIG. 8, the airtight guide ring 23 slips inside the gap C generated as described above to prevent leakage of exhaust gas and leakage of condensate.

The present invention can be applied to exhaust pipes (years) of various buildings and the like using heat source equipment (for example, boilers) in which high-temperature, high-pressure exhaust gases and condensed water are generated.

As described above, the present invention has been described with reference to one embodiment shown in the drawings, but this is only an example, and those skilled in the art may make various modifications and equivalent embodiments therefrom. Will understand. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

Claims (6)

A plurality of inner pipes each having a flange formed at both ends thereof to be coupled to each other in succession to be coupled with the exhaust gas, and a first connection band which fastens the flanges which are butted together to be assembled and connected to the plurality of inner pipes; In the flue duct assembly having a constant distance from the tube and provided with an outer tube installed surrounding the outer peripheral surface of the inner tube, A first heat resistant sealant filled in the flange gap face which is joined to connect the inner tube; A second heat resistant sealant filled between the groove of the first connection band and the outside of the flange while the flange is engaged; And an airtight guide ring installed between the flange and the flange space formed between the flanges and installed on the inner wall of the inner tube to maintain airtightness in the gap. The method of claim 1, The hermetic guide ring is flue duct assembly, characterized in that made of stainless steel. The method of claim 1, The hermetic guide ring is a flue duct assembly, characterized in that consisting of a plate having a thickness of 1.0mm or more. The method of claim 1, Duct assembly for flue characterized in that the height of the airtight guide ring made of 100mm or less. The method of claim 1, And the hermetic guide ring is attached by welding. The method of claim 1, Duct assembly for flue characterized in that the intermediate tube is installed in the center between the inner tube and the outer tube.