Tubular heat exchanger

Patent metadata

Field	Value
Publication number	US-10935278-B2
Application number	US-201716089469-A
Country	US
Kind code	B2
Filing date	Mar 15, 2017
Priority date	Mar 28, 2016
Publication date	Mar 2, 2021
Grant date	Mar 2, 2021

Abstract

The objective of the present invention is to provide a tubular heat exchanger capable of improving heat exchange efficiency and preventing deformation and damage thereof even in a high water-pressure environment. To this end, the present invention includes an outer jacket through which a heat medium is introduced and discharged; a combustion chamber coupled to the inside of the outer jacket so that a heat medium passage is formed between the combustion chamber and the outer jacket, and configured to perform combustion of a burner; a plurality of tubes formed in a flat shape for allowing combustion gas, which is generated in the combustion chamber, to flow along the inside of the combustion chamber and exchange heat with the heat medium; and a turbulator coupled to the inside of the tubes so as to induce generation of turbulence in a flow of the combustion gas.

First claim

The invention claimed is:

1. A tubular heat exchanger comprising:
an outer jacket ( 110 ) through which a heat medium is introduced and discharged;
a combustion chamber ( 120 ) coupled to the inside of the outer jacket ( 110 ) so that a heat medium passage is formed between the combustion chamber ( 120 ) and the outer jacket ( 110 ), and configured to perform combustion of a burner;
a plurality of tubes ( 140 ) formed in a flat shape for allowing combustion gas, which is generated in the combustion chamber ( 120 ), to flow along the inside of the plurality of tubes ( 140 ) and exchange heat with the heat medium; and
a turbulator ( 150 ) coupled to the inside of the tubes ( 140 ) to induce generation of turbulence in a flow of the combustion gas,
wherein the tubular heat exchanger characterized by further comprising:
the turbulator ( 150 ) includes an upper turbulator ( 150 a ) provided at a side into which the combustion gas is introduced, and a lower turbulator ( 150 b ) provided at a side from which the combustion gas is discharged; and
an area of a path between the lower turbulator ( 150 b ) and an inner side surface of the tube ( 140 ) is formed to be smaller than an area of a path between the upper turbulator ( 150 a ) and the inner side surface of the tube ( 140 ) for corresponding to changes in temperature and volume of the combustion gas passing through the tubes ( 140 ).

2. The tubular heat exchanger of claim 1 , wherein the plurality of tubes ( 140 ) are installed in a vertical direction so that the combustion gas generated in the combustion chamber ( 120 ) flows in a downward direction and are spaced apart in a circumferential direction and radially disposed.

3. The tubular heat exchanger of claim 2 , wherein a plurality of tubes ( 140 ) are additionally disposed at a center between the plurality of tubes ( 140 ) which are radially disposed.

4. The tubular heat exchanger of claim 1 , wherein multiple-stage partitions ( 160 , 170 , and 180 ) configured to guide a flow of the heat medium are provided in the outer jacket ( 110 ) to be vertically spaced apart from each other so that a flowing direction of the heat medium is alternatively changed between the inside and the outside of a circumferential direction.

5. The tubular heat exchanger of claim 4 , wherein the plurality of tubes ( 140 ) are inserted into the multiple-stage partitions ( 160 , 170 , and 180 ) to be supported.

6. The tubular heat exchanger of claim 4 , wherein the multiple-stage partitions ( 160 , 170 , and 180 ) include an upper partition ( 160 ), a middle partition ( 170 ), and a lower partition ( 180 ) each having a plate shape,
wherein:
each of the upper partition ( 160 ) and the lower partition ( 180 ) has an opening for the flow of the heat medium at a center thereof, and an edge portion provided to be in contact with an inner side surface of the outer jacket ( 110 ); and
the middle partition ( 170 ) is formed in a shape of which a center is blocked and has an edge portion provided to be spaced apart from the inner side surface of the outer jacket ( 110 ) so that the heat medium flows therebetween.

7. The tubular heat exchanger of claim 4 , wherein:
an upper tube sheet ( 130 ) into which upper end portions of the plurality of tubes ( 140 ) are inserted is coupled to a lower end of the combustion chamber ( 120 ); and
a lower tube sheet ( 190 ) into which lower end portions of the plurality of tubes ( 140 ) are inserted is coupled to a lower end of the outer jacket ( 110 ).

8. The tubular heat exchanger of claim 1 , wherein the turbulator ( 150 ) includes a flat part ( 151 ) configured to divide an inner space of the tube ( 140 ) into two portions and disposed in a longitudinal direction of the tube ( 140 ), and a plurality of first guide portions ( 152 ) and second guide portions ( 153 ) spaced apart from both side surfaces of the flat part ( 151 ) along a longitudinal direction and formed to alternatively protrude to be inclined.

9. The tubular heat exchanger of claim 8 , wherein:
an interval (L 2 ) in which the plurality of first guide portions ( 152 ) and the plurality of second guide portions ( 153 ) formed in the lower turbulator ( 150 b ) are vertically spaced apart from each other is disposed at a relatively denser interval than an interval (L 1 ) in which the plurality of first guide portions ( 152 ) and the plurality of second guide portions ( 153 ) formed in the upper turbulator ( 150 a ) are vertically spaced apart from each other.

10. The tubular heat exchanger of claim 8 , wherein:
the first guide portion ( 152 ) is disposed on one side surface of the flat part ( 151 ) to be inclined to one side;
the second guide portion ( 153 ) is disposed on the other side surface of the flat part ( 151 ) to be inclined to the other side; and
each of the heat media introduced into the first guide portion ( 152 ) and the second guide portion ( 153 ) is sequentially transferred to the second guide portion ( 153 ) and the first guide portion ( 152 ) disposed adjacent to an opposite side of the flat part ( 151 ) to alternatively flow through both spaces of the flat part ( 151 ).

11. The tubular heat exchanger of claim 10 , wherein:
a heat medium introduction end of the first guide portion ( 152 ) is connected to one side end of the flat part ( 151 ) through a first connection portion ( 152 a ), and a first communication port ( 152 b ) in which fluid communication is performed through both spaces of the flat part ( 151 ) is provided between the one side end of the flat part ( 151 ), the first connection portion ( 152 a ), and the first guide portion ( 152 ); and
a heat medium introduction end of the second guide portion ( 153 ) is connected to the other side end of the flat part ( 151 ) through a second connection portion ( 153 a ), and a second communication port ( 153 b ) in which fluid communication is performed through both spaces of the flat part ( 151 ) is provided between the other side end of the flat part ( 151 ), the second connection portion ( 153 a ), and the second guide portion ( 153 ).

12. The tubular heat exchanger of claim 8 , wherein:
the first guide portion ( 152 ) and the second guide portion ( 153 ) include parts of the flat part ( 151 ) cut to be bent to both sides of the flat part ( 151 ); and
fluid communication is performed through both spaces of the flat part ( 151 ) through a cut part of each of the first guide portion ( 152 ) and the second guide portion ( 153 ).

13. The tubular heat exchanger of claim 1 , wherein the lower turbulator ( 150 b ) is formed to have an occupying area in the tube ( 140 ) greater than that of the upper turbulator ( 150 a ).

14. The tubular heat exchanger of claim 1 , wherein a plurality of protrusions ( 141 ) are formed on the inner side surface of the tube ( 140 ) located at the side from which the combustion gas is discharged.

15. The tubular heat exchanger of claim 1 , wherein a supporter ( 142 ) configured to support water-pressure is additionally provided in the tube ( 140 ).

16. The tubular heat exchanger of claim 15 , wherein the supporter ( 142 ) includes a support part of which both ends are fixed to an inner side surface of the tube ( 140 ).

17. The tubular heat exchanger of claim 15 , wherein the supporter ( 142 ) includes an embossing portion formed on each of both corresponding side surfaces of the tube ( 140 ) to protrude toward the inside of the tube ( 140 ).

18. The tubular heat exchanger of claim 1 , wherein the outer jacket ( 110 ) is formed in a cylindrical

Assignees

• Kyungdong Navien Co Ltd

Inventors

• Park Jun Kyu
• Lee Su Hyun
• Ahn Sung Jun

Classifications

• F24H1/44 Primary

  with combinations of two or more of the types covered by groups F24H1/24 - F24H1/40 · CPC title

• F15D1/00 Primary

  Influencing flow of fluids · CPC title

• F28D21/00

  Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00 · CPC title

• F24H9/0026

  in combustion gas channels · CPC title

• F24H1/40

  with water tube or tubes · CPC title