# US 2008/0185131 A1 · Heat exchanger and method of producing the same

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- Number: US 2008/0185131 A1
- Document ID: US20080185131A1
- Status: Published application
- Kind: A1
- Application number: 11/702,174
- Filed: 2007-02-05
- Published: 2008-08-07
- Earliest claimed: 2007-02-05
- Assignees: RIELLO S.p.A.
- Inventors: Christian Cannas
- Web page: https://patentgrep.com/patent/US20080185131A1

## CPC

- F28F 1/22: the means having portions engaging further tubular elements
- F24H 1/43: helically or spirally coiled
- F24H 9/0026: {in combustion gas channels}
- F28D 7/022: {the conduits of two or more media in heat-exchange relationship being helically coiled, the coils having a cylindrical configuration}
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- F24H: FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL (steam generation F22)
- F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general)

## Abstract

A heat exchanger for a gas boiler for producing hot water is provided with a casing extending along a first axis and through which combustion fumes flow; a tube forming a plurality of turns along which water flows arranged inside the casing so as to form gaps between adjacent turns; a disk for guiding said fumes trough the gaps; and teeth integrally made with the tube for spacing adjacent turns apart and forming said gaps.

## Claims

### Claim 1

1) A heat exchanger for a gas boiler for producing hot water; the heat exchanger (4) comprising a casing (10) extending along a first axis (A1) and through which combustion fumes flow; a tube (11) forming a plurality of turns (17) along which water flows; said turns (17) being arranged inside said casing (10) so as to form gaps between adjacent turns (17); deflecting means (12) for guiding said fumes trough said gaps; and spacing means (25) for spacing adjacent turns (17) apart and forming said gaps; characterised in that said spacing means are teeth (25) integrally made with tube (11).

### Claim 2 (depends on 1)

2) A heat exchanger as claimed in claim 1, characterised in that said teeth (25) are substantially radial with respect to said tube (11).

### Claim 3 (depends on 1)

3) A heat exchanger as claimed in claim 1, characterized in that said teeth (25) are evenly distributed along the length of each tube (11).

### Claim 4 (depends on 1)

4) A heat exchanger as claimed in claim 1, characterized in that said tube (11) is finned.

### Claim 5 (depends on 1)

5) A heat exchanger as claimed in claim 1, characterized in that said tube (11) is coiled in a helix (16) comprising a plurality of turns (17).

### Claim 6 (depends on 1)

6) A heat exchanger as claimed in claim 1, characterized in that each tooth (25) of a turns (17) has a distal face (24) substantially flat suitable to abut against the outer surface (21a) of an adjacent turns (17).

### Claim 7 (depends on 7)

7) A heat exchanger as claimed in claim 7, characterized in that said tube (11) has an oval shaped cross section; each tooth (25) protruding from the portion of the tube (11) having the largest radius.

### Claim 8 (depends on 1)

8) A method of producing a heat exchanger (4) in accordance with claim 1, characterized by extruding said tube (11) integrally with a longitudinal rib (22) enclosing said teeth (25).

### Claim 9 (depends on 8)

9) A method as claimed in claim 8, characterized by partially machining said rib (22) so as to forms teeth (25) along the length of said tube (11).

### Claim 10 (depends on 9)

10) A method as claimed in claim 9, characterized in that said teeth (25) have a cross section equal to the cross section of said rib (22).

### Claim 11 (depends on 9)

11) A method as claimed in claim 9, characterised in that said tube is a finned tube (11).

### Claim 12 (depends on 11)

12) A method as claimed in claim 11, characterised by co-extruding fins (28, 27, 28, 29; 26, 27) with said rib (25) and said tube (11).