U.S. patent application number 14/618728 was filed with the patent office on 2015-06-11 for internal heat exchanger.
The applicant listed for this patent is ContiTech Kuehner GmbH & CIE KG. Invention is credited to Nikhil Baxi, Bert Welch, IV.
Application Number | 20150159957 14/618728 |
Document ID | / |
Family ID | 49001098 |
Filed Date | 2015-06-11 |
United States Patent
Application |
20150159957 |
Kind Code |
A1 |
Baxi; Nikhil ; et
al. |
June 11, 2015 |
INTERNAL HEAT EXCHANGER
Abstract
An internal heat exchanger includes an inner tube for a flow of
a first fluid; an outer tube that is coaxial with the inner tube; a
passageway between the inner tube and the outer tube for a flow of
a second fluid; and, a flow enhancer inside the inner tube and
configured to divert the flow of fluid in the inner tube along a
wall of the inner tube.
Inventors: |
Baxi; Nikhil; (Cordova,
TN) ; Welch, IV; Bert; (Memphis, TN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
ContiTech Kuehner GmbH & CIE KG |
Oppenweiler |
|
DE |
|
|
Family ID: |
49001098 |
Appl. No.: |
14/618728 |
Filed: |
February 10, 2015 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
PCT/US2013/054449 |
Aug 11, 2013 |
|
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14618728 |
|
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|
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61681668 |
Aug 10, 2012 |
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Current U.S.
Class: |
165/109.1 |
Current CPC
Class: |
F28F 13/12 20130101;
F28F 13/06 20130101; F28D 7/106 20130101; F25B 40/00 20130101; F28D
7/10 20130101 |
International
Class: |
F28D 7/10 20060101
F28D007/10; F28F 13/06 20060101 F28F013/06 |
Claims
1. An internal heat exchanger comprising: an inner tube for a first
flow of a first fluid; an outer tube; said inner tube and said
outer tube being coaxial to each other; said inner tube and said
outer tube conjointly defining a passageway therebetween for a
second flow of a second fluid; said inner tube having an inner tube
wall; and, a flow enhancer arranged inside said inner tube and
configured to divert said first flow of said first fluid along said
inner tube wall.
2. The internal heat exchanger of claim 1, wherein said flow
enhancer is an elongate member.
3. The internal heat exchanger of claim 1, wherein said flow
enhancer includes a central portion and a plurality of radial
members extending from said central portion.
4. The internal heat exchanger of claim 3, wherein said central
portion has a cylindrical shape.
5. The internal heat exchanger of claim 3, wherein said radial
members each have an outer portion in contact with said inner
tube.
6. The internal heat exchanger of claim 1 further comprising a
spring arranged between said inner tube and said outer tube.
7. The internal heat exchanger of claim 1 further comprising a
plurality of longitudinal channels between said inner tube and said
outer tube.
8. The internal heat exchanger of claim 1, wherein said flow
enhancer and said inner tube wall conjointly define a plurality of
channels therebetween.
9. A flow enhancer for an internal heat exchanger comprising: an
axially extending central body; and, a plurality of radial members
extending from said central body.
10. The flow enhancer of claim 9, wherein: said central body has an
axial length; and, at least one of said radial members is a
continuous fin extending over the full extent of said axial
length.
11. The flow enhancer of claim 9, wherein: said central body has an
axial length; and, said radial members comprise a plurality of fins
that extend along a portion of said axial length.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation application of
international patent application PCT/US2013/054449, filed Aug. 11,
2013 which designates the United States and claims priority from
United States Provisional Application No. 61/681,668 filed Aug. 10,
2012. The present continuation application claims priority to each
of the above applications and incorporates herein the entire
contents thereof by reference.
FIELD OF THE INVENTION
[0002] The present disclosure relates to an internal heat
exchanger, and more particularly to a double tube internal heat
exchanger for a vehicle.
BACKGROUND OF THE INVENTION
[0003] Internal heat exchanger assemblies are now being used on
vehicle air conditioning systems to improve performance and system
efficiency. Efficiency and performance gains are achieved by the
use of a coaxial heat exchanger where the liquid refrigerant is
flowed around the outside of the suction tube.
[0004] Heat is transferred from the liquid to the suction line
which increases sub-cooling in the liquid line.
SUMMARY OF THE INVENTION
[0005] The present invention includes an internal heat exchanger
for a vehicle with improved suction line flow. The internal heat
exchanger has an inner tube and an outer tube. The inner tube and
outer tube are coaxial with one another. A flow enhancer is
disposed within the inner tube to divert flow of fluid towards an
outer wall of the inner tube. The flow diversion aids in the
transfer of heat to the outer wall thereby improving the efficiency
of the heat exchanger.
[0006] The flow enhancer may be an elongate shape and may be
formed, for example, from an extrusion process. The flow enhancer
can be shaped so as to divert flow towards the outer wall of the
inner tube while blocking the flow of fluid from the middle of the
tube. For example, the flow enhancer may be an elongate member
having a generally cylindrical central portion and a plurality of
radially extending longitudinal fins.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] The invention will now be described with reference to the
drawings wherein:
[0008] FIG. 1 is a spring internal heat exchanger;
[0009] FIG. 2A shows a view of a multi-channel internal heat
exchanger;
[0010] FIG. 2B shows a section along line 2B-2B of FIG. 2A;
[0011] FIG. 2C shows a view of a multi-channel internal heat
exchanger;
[0012] FIG. 3A is an embodiment of a flow enhancer in accordance
with aspects of the invention;
[0013] FIG. 3B is an embodiment of a suction tube;
[0014] FIG. 3C is an embodiment of an assembly of the flow enhancer
and suction tube of FIGS. 3A and 3B;
[0015] FIG. 4A is an embodiment of an assembly of a flow enhancer,
a suction tube and a liquid tube of a channel internal heat
exchanger;
[0016] FIG. 4B is an embodiment of an assembly of a flow enhancer,
a suction tube and a liquid tube of a spring internal heat
exchanger;
[0017] FIG. 5A is an embodiment of a spring internal heat exchanger
having a flow enhancer; and,
[0018] FIG. 5B is an embodiment of a channel internal heat
exchanger having a flow enhancer.
DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION
[0019] FIG. 1 is a spring internal heat exchanger 10. FIGS. 2A to
2C show various views of a channel heat exchanger 20. Both heat
exchangers (10, 20) include an inner tube 30 and an outer tube 32
that are coaxial with one another. The inner tube 30 is the return
line (also referred to as a "suction line") of a refrigeration
system. The inner tube 30 and outer tube 32 are separated by a
passageway. In the spring heat exchanger 20, the inner tube 30 and
outer tube 32 are separated by a spring 34 forming a helical
passageway between the tubes. In the channel heat exchanger 30, the
inner tube 30 and outer tube 32 are separated by a plurality of
ribs 36 that form one or more channel-shaped passageways 38.
[0020] Referring now to FIGS. 3A to 3C, the heat exchangers (10,
20) are shown with a flow enhancer 50. The flow enhancer 50 may be
an elongate member. The elongate member may be formed by an
extrusion process. As shown best in FIG. 3A, the flow enhancer 50
has a central portion 52 that extends axially and a plurality of
radial members 52 (for example, ribs) that extend along the axial
length of the flow enhancer. In one embodiment, at least one radial
member can be a continuous fin that extends along the full axial
length of the flow enhancer. Additionally or alternatively, the
flow enhancer may include a plurality of fins that extend along a
portion of an axial length of the flow enhancer (for example, less
than the full axial length of the flow enhancer).
[0021] The central portion 52 may have a substantially circular
cross-section. The flow enhancer 50 is assembled with the inner
tube 30 such that the flow enhancer 50 and inner tube 30 are
coaxial with one another. The outer portions 54 of the radial
members 52 may be in contact with the inner tube 30, as shown in
FIG. 3C.
[0022] The flow enhancer 50, and in particular, the central portion
52, blocks flow in the center of the inner tube 30 (suction tube)
and diverts or forces the flow against a wall 51 of the tube 30.
The central portion 52 and radial members 54 can be configured to
minimize pressure drop across the internal heat exchanger. The flow
enhancer may be formed from a composite material that may be
bendable with the inner and outer tubes. In one embodiment, the
flow enhancer is constructed from a composite material that does
not substantially affect heat transfer.
[0023] Referring still to FIGS. 3A to 3C, the material can, for
example, also be composite plastic, nylon or any metal such as
aluminum, copper or a combination of metal and plastic. The rib
design may or may not be continuous.
[0024] FIG. 4A is an embodiment of an assembly of a flow enhancer,
a suction tube and a liquid tube of a channel internal heat
exchanger wherein the rib edge is in contact with the suction tube
inner diameter. FIG. 4B is an embodiment of an assembly of a flow
enhancer, a suction tube and a liquid tube of a spring internal
heat exchanger wherein the rib edge is in contact with the suction
tube inner diameter.
[0025] FIG. 5A is an embodiment of a spring internal heat exchanger
having a flow enhancer and FIG. 5B is an embodiment of a channel
internal heat exchanger having a flow enhancer.
[0026] It is understood that the foregoing description is that of
the preferred embodiments of the invention and that various changes
and modifications may be made thereto without departing from the
spirit and scope of the invention as defined in the appended
claims.
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