Heat exchanger for the feeding of fuel in internal combustion engines

Patent metadata

Field	Value
Publication number	US-2016265490-A1
Application number	US-201414901310-A
Country	US
Kind code	A1
Filing date	Jul 1, 2014
Priority date	Jul 2, 2013
Publication date	Sep 15, 2016
Grant date	—

Abstract

The heat exchanger comprises a first and a second stage (E1,E2), each having an inlet and an outlet of water, the second stage (E2) having an inlet and an outlet of oil, the first stage (E1) being provided with fuel inlet and outlet nozzles, selectively connected, in parallel, to the fuel supply to the engine (M). The inlet and outlet of water of the first stage (E1) are respectively connected to the outlet of the water radiator, by means of a cooling water circuit internal to the engine (M), and to the water inlet of the second stage (E2). The water outlet of the second stage (E2) is connected to the inlet of a water radiator, and the inlet and outlet of oil in the second stage (E2) are connected in series to a lubricant oil circuit internal to the engine (M).

First claim

1 . A heat exchanger for the feeding of fuel in internal combustion engines provided with a cooling water circuit, having an inlet, connected to an outlet of a water radiator, and an outlet; and with a lubricant oil circuit having an inlet and an outlet,
wherein the heat exchanger (HE) comprises: a first and a second stage (E 1 , E 2 ), each having an inlet and an outlet of water, the second stage (E 2 ) having an inlet and an outlet of oil, the first stage (E 1 ) being provided with fuel inlet and outlet nozzles, selectively connected, in parallel, to the fuel supply to the engine (M); the inlet and outlet of water of the first stage (E 1 ) being respectively connected to the outlet of the water radiator, by means of the cooling water circuit, and to the water inlet of the second stage (E 2 ); the water outlet of the second stage (E 2 ) being connected to the inlet of the water radiator, and the inlet and outlet of oil in the second stage (E 2 ) being connected in series to the lubricant oil circuit.

2 . The heat exchanger, as set forth in claim 1 , wherein the water inlet of the first stage (E 1 ) is connected to the outlet of the water radiator by means of the cooling water circuit, the latter having its inlet connected to the outlet of the water radiator, by means of a cooled water conduit, and its outlet connected to the water outlet of the first stage (E 1 ).

3 . The heat exchanger, as set forth in claim 1 , wherein the fuel inlet and outlet nozzles are provided at one side of the first stage (E 1 ) which is opposite to a side of the latter in which are provided the inlet and outlet of water.

4 . The heat exchanger, as set forth in claim 1 , wherein the water inlet of the first stage (E 1 ) is connected to the outlet of the cooling water circuit by a return conduit, the water outlet of the first stage (E 1 ) being connected to the water inlet of the second stage (E 2 ) by an interconnection conduit, the water outlet of the second stage (E 2 ) being connected to the inlet of the water radiator, by a hot water conduit.

5 . The heat exchanger, as set forth in claim 4 , wherein the interconnection conduit and the hot water conduit each comprise a median segment provided inside the engine (M), each median segment being defined by at least part of the extension of the respective conduit and presenting an inlet and an outlet open to the outside of the engine (M).

6 . The heat exchanger, as set forth in claim 5 , wherein the inlet and outlet of oil of the second stage (E 2 ) is connected to the lubricant oil circulation circuit by means of respective oil conduits.

7 . The heat exchanger, as set forth in claim 6 , wherein the water outlet of the first stage (E 1 ) is seated against the engine (M) and maintained in fluid communication with the inlet and with the outlet of the median segment of the interconnection conduit, the water outlet of the second stages (E 2 ) being seated against the engine (M) and maintained in fluid communication with the inlet of the median segment of the hot water conduit, the inlet and outlet of oil of the second stage (E 2 ) being seated against the engine (M) and maintained in fluid communication with the lubricant oil circuit by means of the oil conduits.

8 . The heat exchanger, as set forth in claim 7 , wherein each of the two stages (E 1 , E 2 ) of thermal exchange is mounted to a support (S), for fixation to the engine (M) or to a structure for installation to the engine (M) and being defined by a flange against one side of which is seated and affixed a respective stage (E 1 , E 2 ), said flange presenting through holes in which are respectively defined the inlet and outlet of water of the first stage (E 1 ) and the inlet and outlet of water and the inlet and outlet of oil in the second stage (E 2 ).

9 . The heat exchanger, as set forth in claim 8 , wherein the return conduit, the interconnection conduit extensions external to the engine (M), the hot water conduit extension which is external and located upstream the engine (M) and the oil conduits are each defined by a respective through hole of the flange, which define the inlets and outlets of water and oil in the first and in the second stage (E 1 , E 2 ).

10 . The heat exchanger, as set forth in claim 9 , wherein the flange is seated and affixed against the engine (M), in order to establish the direct fluid communication between: the water inlet in the first stage (E 1 ) with the outlet of the cooling water circuit; the water outlet of the first stage (E 1 ) with the inlet of the median segment of the interconnection conduit; the outlet of the median segment of the interconnection conduit with the water inlet in the second stage (E 2 ); the water outlet of the second stage (E 2 ) with the inlet of the median segment of the hot water conduit; and of the inlet and outlet of oil of the second stage (E 2 ) with the lubricant oil circuit.

11 . The heat exchanger, as set forth in claim 1 , wherein the first stage (E 1 ) comprises a first and a second group (G 1 ,G 2 ) of chambers, the second stage comprising a third and fourth groups (G 3 ,G 4 ) of chambers, the chambers of both groups in each stage (E 1 ,E 2 ) being alternately overlapped and open to two conduits spaced from each other, every two conduits of the same group of chambers having inner ends, open to an end chamber of the respective group, and outer ends respectively open to the inlet and outlet of water and to the fuel inlet and outlet nozzles in the first stage (E 1 ) and also to the inlet and outlet of water and to the inlet and outlet of oil in the second stage (E 2 ).

12 . The heat exchanger, as set forth in claim 11 , wherein the conduits of each group of chambers are located through the interior of the respective stage (E 1 , E 2 ), crossing the chambers located between the outer chamber of the respective group (G 1 , G 2 , G 3 , G 4 ), to the interior of which are open the inner ends of the respective conduits, and the outer ends of said conduits, the latter being centrally and radially open to the chambers of the respective group crossed by said conduit.

13 . The heat exchanger, as set forth in claim 11 , wherein the other outer ends of the conduits of the second group (G 2 ) of chambers are respectively connected to the fuel inlet and outlet nozzles which project outward from an end cover, closing an adjacent chamber of the second group (G 2 ) of chambers, located in an end of the first stage (E 1 ) opposite to the other side of the latter in which are provided the inlet and outlet of water.

14 . The heat exchanger, as set forth in claim 11 , wherein the chambers of both pairs of groups (G 1 , G 2 ; G 3 , G 4 ) in the respective stages (E 1 , E 2 ) are separated from each other by a common wall (W).

15 . The heat exchanger, as set forth in claim 11 , wherein the chambers of each stage (E 1 ,E 2 ) have the same flat elongated shape and reduced height in relation to its area, each of the two conduits of each group of chambers being located in an end region of the respective stage (E 1 ,E 2 ) of thermal exchange which is opposite to that in which is located the other conduit.

Assignees

• Mahle Metal Leve Sa

Inventors

• Azevedo Junior Edson Valdomiro De
• Amaral Tadeu Miguel Malago

Classifications

• F02M31/10 Primary

  by hot liquids, e.g. lubricants {or cooling water} · CPC title

• F01M5/002

  Cooling · CPC title

• F28D9/0093

  Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids · CPC title

• Y02T10/12

  Improving ICE efficiencies · CPC title

• F28D9/0037

  the conduits for the other heat-exchange medium also being formed by paired plates touching each other (F28D9/0043 takes precedence) · CPC title