Fin-tube type heat exchanger

Patent metadata

Field	Value
Publication number	US-9989316-B2
Application number	US-201314646721-A
Country	US
Kind code	B2
Filing date	Nov 18, 2013
Priority date	Dec 26, 2012
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

The present invention relates to a pin-tube type heat exchanger, comprising: tubes through the inside of which a heat medium flows and which are arranged in parallel with a uniform distance therebetween, so that a combustion product can pass through space between the tubes; and heat transfer fins which are separately coupled to the outer surface of the tubes along the longitudinal direction thereof, so as to be parallel to the direction of flow of the combustion product, wherein inside the tubes a first turbulent flow-generating member is installed for creating turbulence in the flow of the heat medium, wherein the first turbulent flow-generating member comprises a flat plate part, arranged in the longitudinal direction of the tubes, for dividing the inner space of the tubes into two sides, and first guide pieces and second guide pieces which are protrudingly provided at a tilted angle and are separately and alternately provided along the longitudinal direction of both sides of the flat plate part.

First claim

The invention claimed is:

1. A fin-tube type heat exchanger comprising:
tubes through which a heat medium flows, the tubes being disposed in parallel at a predetermined distance to allow a combustion product to pass through a space therebetween; and
heat transfer fins spaced apart from each other and coupled to outer surfaces of the tubes along a longitudinal direction so that the heat transfer fins are disposed parallel to a flow direction of the combustion product,
wherein a first turbulent flow-generating member for generating a turbulent flow in the heat medium is disposed inside each of the tubes,
wherein the first turbulent flow-generating member comprises:
a flat plate part disposed in the longitudinal direction of the tube to divide an inner space of the tube into two spaces;
a plurality of first guide pieces and a plurality of second guide pieces spaced apart from each other along the longitudinal direction to alternately protrude inclined from both side surfaces of the flat plate part; and
a plurality of first communication holes and a plurality of second communication holes through which fluid communicates with both spaces of the flat plate part and disposed at adjacent to the plurality of first guide pieces and the plurality of second guide pieces,
wherein a portion of the flat plate part is cut and bent in both directions of the flat plate part to form the first guide pieces and the second guide pieces,
wherein the fluid communicates with both spaces of the flat plate part through the cut portions of the first guide pieces and the second guide pieces,
wherein a heat medium inflow end of the first guide pieces are connected to a lower end of the flat plate part by a first connection piece, and simultaneously, the plurality of first communication holes are defined between the lower end of the flat plate part, the first connection piece, and the first guide pieces;
wherein a heat medium inflow end of the second guide pieces are connected to a upper end of the flat plate part by a second connection piece, and simultaneously, the plurality of second communication holes are defined between the upper end of the flat plate part, the second connection piece, and the second guide pieces,
wherein a lower end of the first connection piece and a lower end of the first guide piece protrude downward at the lower end of the flat plate part, thereby coming into contact with the inner side of the tube, and then allowing the fluid to communicate through a space between the lower end of the flat plate part located among the plurality of first communication holes disposed adjacent to the plurality of first guide pieces and the inner side of the tube, and
wherein an upper end of the second connection piece and an upper end of the second guide piece protrude upward at an upper end of the flat plate part, thereby coming into contact with the inner side of the tube, and then allowing the fluid to communicate through a space between the upper end of the flat plate part located among the plurality of second communication holes disposed adjacent to the plurality of second guide pieces and the inner side of the tube.

2. The fin-tube type heat exchanger of claim 1 , wherein the first guide pieces are disposed inclined on one surface of the flat plate part so that the heat medium flows upward,
the second guide pieces are disposed inclined on the other surface of the flat plate part so that the heat medium flows downward, and
the heat medium introduced into the first guide pieces and the second guide pieces are successively guided to the second guide pieces and the first guide pieces disposed adjacent to an opposite surface of the flat plate part to alternately flow through both spaces of the flat plate part.

3. The fin-tube type heat exchanger of claim 2 , wherein a heat medium discharge end of the first guide pieces is disposed at a height adjacent to the upper end of the flat plate part, and
a heat medium discharge end of the second guide pieces is disposed at a height adjacent to the lower end of the flat plate part.

4. The fin-tube type heat exchanger of claim 1 , wherein a third guide piece having a tilted angle that is different from that of the first guide pieces to cross the first guide pieces protrudes from one surface of the flat plate part, and
a fourth guide piece having a tilted angle that is different from that of the second guide pieces to cross the second guide pieces protrudes from the other surface of the flat plate part.

5. The fin-tube type heat exchanger of claim 1 , wherein welding parts protrude respectively from front and rear ends of the flat plate part in both directions and are welded and coupled to an inner surface of the tube.

6. The fin-tube type heat exchanger of claim 1 , wherein an inflow tube and a discharge tube of the heat medium are disposed at both sides of the tubes, respectively, and
a second turbulent flow-generating member for generating a turbulent flow of the heat medium is disposed in each of the inflow tube and the discharge tube,
wherein the second turbulent flow-generating member comprises:
a plate member disposed in each of the inflow tube and the discharge tube in the longitudinal direction to vertically divide the inside of each of the inflow tube and the discharge tube; and
first and second inclined parts spaced apart from each other along a flow direction of the heat medium and formed by cutting a portion of the plate member, the first and second inclined parts being alternately bent in different directions inclined in a vertical direction.

7. The fin-tube type heat exchanger of claim 6 , wherein each of the first and second inclined parts disposed adjacent to each other along the flow direction of the heat medium are alternately inclined in upward and downward directions.

8. The fin-tube type heat exchanger of claim 1 , wherein a plurality of louvers having sizes and tilted angles different from each other are disposed on each of the heat transfer fins along a flow direction of the combustion product introduced between the heat transfer fins disposed adjacent to each other.

9. The fin-tube type heat exchanger of claim 8 , wherein a portion of the heat transfer fin is cut to be bent in one direction to form the plurality of louvers, and
the fluid communicates with both sides of the heat transfer fin through the cut portions of the heat transfer fin.

10. The fin-tube type heat exchanger of claim 8 , wherein the louvers are disposed on an area after a temperature boundary point of the combustion product.

11. The fin-tube type heat exchanger of claim 1 , wherein each of the tubes has a rectangular cross section of which a side parallel to a flow direction of the combustion product has a length longer than that of a side of inflow and discharge-sides of the combustion product.

Assignees

• Kyungdong Navien Co Ltd

Inventors

• Lee Dong Keun

Classifications

• F28D21/0007

  Water heaters · CPC title

• F28D2021/0024

  for combustion apparatus, e.g. for boilers · CPC title

• F28F13/12

  by creating turbulence, e.g. by stirring, by increasing the force of circulation (F28F13/08 takes precedence) · CPC title

• F28F1/32

  the means having portions engaging further tubular elements · CPC title

• F28F2215/10

  Secondary fins, e.g. projections or recesses on main fins · CPC title