Finned heat exchanger

Details Finned heat exchanger Finned heat exchanger

1996-11-08

2001-05-08

Lazarus, Ira S. (Department: 3743)

Heat exchange

Radiator core type

Side-by-side tubes traversing fin means

C165S135000

Reexamination Certificate

active

06227289

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a finned heat exchanger used widely in the field of air-conditioners or refrigerating machines.
Recently, along with the trend for smaller and thinner structures for air-conditioners, a further enhancement of the heat exchange capacity is being demanded in finned heat exchangers.
FIG.
7
A and
FIG. 7B
are plan and sectional views of a prior art finned heat exchanger having an improved heat exchange capacity, which was disclosed in Japanese Laid-Open Patent No. Hei 2-217792. A plurality of fin collars
12
are burred at a right angle to each plate fin
11
. The fin collars
12
are spaced at specific intervals on the plate fins. A heat transfer tube
13
is inserted into the fin collars
12
, aligned with each other on different plate fins and is expanded to contact tightly within the fin collars
12
. Arrow B shows a principal direction of an air stream. Between adjacent fin collars
12
on each plate fin, three rows of raised portion groups
14
a
,
14
b
,
14
c
are formed on one side of each plate fin
11
. The three rows of raised portion groups are composed of one raised portion
14
a
, two raised portions
14
b
, and three raised portions
14
c
. The width Wf of a raised portion is formed to be about ⅓ of a flat fin width Wb of a fin between raised portions.
In the finned heat exchanger, shown in FIG.
7
A and
FIG. 7B
, the air flow pressure drop was decreased and the heat exchange capacity was improved. However, if there is a temperature difference between the fluids flowing in the heat transfer tubes
13
, heat exchange occurs due to heat conduction through the flat portion of the plate fins in the wide areas thereon. As a result, the improvement in the heat exchange capacity of the Hei application was found to be insufficient. In particular, forming plural rows of heat transfer tubes in the finned heat exchanger shown in FIG.
7
A and
FIG. 7B
, and having fluids flowing in the heat transfer tubes with a temperature difference in the fluids flowing in the heat transfer tubes adjacent in rows, the fluids flowing in the individual heat exchange tubes exchange heat with each other by heat conduction through the flat fin area having a wide area. Accordingly, if the finned heat exchanger in FIG.
7
A and
FIG. 7B
is used in plural rows, the Hei heat exchanger lacks sufficient heat exchange capacity.
SUMMARY OF THE INVENTION
It is hence an object of the invention to suppress heat conduction through the plate fins if there is a temperature difference between fluids flowing in adjacent heat transfer tubes, and to enhance the heat exchange capacity of heat exchangers.
In particular, the finned heat exchanger of the present invention comprises plate fins, fin collars provided at a right angle to the plate fins, heat transfer tubes inserted in the fin collars, plural raised portions provided only on one side of the fin surface between adjacent heat transfer tubes, with the width being about ⅓ of the width of the wide area between the adjacent raised portions in the flat portion of the plate fin, and additional insulating means in the form of grooves such as slits, slots or raised portions are provided in the fins near the middle of or midway between adjacent rows of heat transfer tubes, in an area of temperature difference between fluids flowing in adjacent heat transfer tubes.
The invention itself, together with further objects and attendant advantages, will best be understood by reference to the following detailed description taken in conjunction with the accompanying figures.


REFERENCES:
patent: 2963277 (1960-11-01), Heller et al.
patent: 4434844 (1984-03-01), Sakitani et al.
patent: 4723599 (1988-02-01), Hanson
patent: 5042576 (1991-08-01), Broadbent
patent: 5076353 (1991-12-01), Haussmann
patent: 5117902 (1992-06-01), Kusuhara et al.
patent: 5170842 (1992-12-01), Kata et al.
patent: 5692561 (1997-12-01), Kang et al.
patent: 5697432 (1997-12-01), Yun et al.
patent: 5706885 (1998-01-01), Kim
patent: 63-183391 (1988-07-01), None
patent: 2-64396 (1990-03-01), None
patent: 2-217792 (1990-08-01), None

Affiliated with

Also associated with

Rating

Finned heat exchanger does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Finned heat exchanger, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Finned heat exchanger will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2518487