JPH0435608B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a charge air cooling device for an internal combustion engine suitable for a multi-cylinder engine with a supercharger.

(Prior art) A conventional charge air cooling system for an internal combustion engine employs a structure in which a core assembly that has a group of cooling water pipes and allows the supply air to pass between each cooling water pipe is simply inserted into a cooler case. (for example, JP-A-Sho
57-171027). However, with the configuration in which the core assembly is inserted into the cooler case, it is inevitable that a small gap will be created between the cooler case and the core assembly, and as a result, the supply air will pass through the gap, and sufficient heat will not be generated. Exchange is no longer performed, and heat exchange efficiency decreases.

(Problems to be Solved by the Invention) The conventional configuration described above has the problem that the supply air passes through the small gap between the cooler case and the core assembly, reducing the heat exchange rate. ing. Furthermore, since the heat exchange efficiency is low, there is also the problem that the supply air cooling device must be enlarged in order to obtain a sufficient cooling effect on the supply air.

The present invention attempts to solve the above problems.

(Means for Solving the Problems) The present invention provides an internal combustion engine in which a core assembly having a group of cooling water pipes and through which supply air passes through fins arranged between each cooling water pipe is inserted into a cooler case. In the air supply cooling system of
The core assembly is provided with a side plate and an intermediate plate that divides the upper part of the cooler case at the midpoint in the length direction of the cooling water pipe, thereby dividing the upper part of the cooler case into an upper chamber on the air supply inlet side and an upper chamber on the air supply outlet side. A groove extending in the vertical direction is formed in a portion of the inner circumferential surface of the side wall of the cooler case corresponding to the upper part of both ends of the intermediate plate, and a groove opening downward facing the upper edge of the intermediate plate is formed in the partition. Grooves extending parallel to the cooling water pipes are formed on the inner surface of the side wall, and each of the grooves is continuously filled with a sealant, and the sealant seals the space between the partition and the upper end of the intermediate plate, and between the inner surface of the side wall of the cooler case and the intermediate plate. A supply air cooling device for an internal combustion engine characterized by maintaining airtightness between the side plates and the side plates.

(Example) In FIG. 2, the cooler case 11 has a partition 12 at the center of the upper end (center on the front side of the paper), and an air supply inlet 13 and an air supply outlet 14 are opened upward on both sides of the partition 12. . Cooler case 11
Inside are multiple cooling water pipes 1 extending in the left and right direction of the figure.
5 are inserted so as to be parallel to each other, and corrugated fins 16 are inserted between each cooling water pipe 15 and between each cooling water pipe 15 and the inner wall surface of the cooler case 11 (partially omitted). Both ends of the cooling water pipe 15 are fixed to tube plates 17 and 18 within the cooler case 11 by brazing to maintain airtightness (not shown). The tube sheets 17 and 18 are
The inlet side tank 19 and the outlet side tank 20 are in pressure contact with
It is integrally fixed to the cooler case 11 by tightening together with each nut 21 and stud bolt 22. In addition, cooler case 1
1 and between the tanks 19 and 20 and the tube sheets 17 and 18, gaskets 2 are provided respectively to maintain airtightness.
3 is intervening.

As shown in FIG.
The cross section is an ellipse that is vertically elongated. Four cooling water pipes 15 are arranged at equal intervals in upper and lower stages, and each cooling water pipe 1
The five fins 16 disposed between the cooling water pipe 15 and the inner surface of the cooler case 11 are not bent in the vertical direction. Although not shown in the drawings, the fins 16 are preferably provided with louvers. Also, the portion of the fin 16 that contacts the cooling water pipe 15 is brazed to the cooling water pipe 15.
is fixed to, thereby keeping it in place.

A thin side plate 25 is interposed between the fins 16 and the side wall of the cooler case 11, and the side plate 25 is fixed to the fins 16 on the side wall side of the cooler case 11. The lower ends of the fins 16 and the side plates 25 are arranged in the vertical middle part of the space formed in the cooler case 11, and a space free from obstacles is formed in the lower part of the cooler case 11, so that the lower chamber is closed. 24 are provided. Furthermore, the longitudinal center of the cooling water pipe 15 (the center in the direction perpendicular to the page)
An intermediate plate 2 extending perpendicularly to the cooling water pipe 15 is provided.
6 is provided, and the upper space within the cooler case 11 is divided into two by the intermediate portion 26. Note that a hole through which the central portion of the cooling water pipe 15 passes is provided in the intermediate plate 26 at a position corresponding to the arrangement of the cooling water pipe 15 (not shown). In addition, the lower end of the intermediate plate 26 protrudes somewhat lower than the lower ends of the fins 16 and the side plates 25, and both ends and the upper end of the intermediate plate 26 in the left-right direction in FIG. ing.

A groove 27 extending in the vertical direction is formed in a portion of the inner surface of the side wall of the cooler case 11 corresponding to the upper portions of both side ends of the intermediate plate 26 . Further, as shown in FIG. 3, at the lower end of the partition 12, there is a groove 28 that opens downward and extends in a direction perpendicular to the paper surface of FIG. 3, so as to face the upper end of the intermediate plate 26 (FIG. 2). It is formed by posture. Further, a groove 29 is formed on the inner surface of the side wall of the cooler case 11, and extends parallel to the cooling water pipe 15 (FIG. 1) (in the left-right direction in FIG. 3). The groove 29 reaches from the lower end of the groove 27 to both ends of the cooler case 11. groove 27,2
8 and 29 form a series of grooves, and grooves 27 and 2
8 and 29 are continuously filled with sealant 30. As the sealant 30, a liquid sealant such as a silicone sealant is used. This sealant 30 maintains airtightness between the partition 12 and the upper end of the intermediate plate 26 shown in FIG. 2, and between the inner surface of the side wall of the cooler case 11 and the side plate 25 and intermediate plate 26.

The charge air cooling device shown in FIGS. 1 to 3 is installed, for example, in an internal combustion engine as shown in FIG. 4. In FIG. 4 (arrow F points forward), an engine body 40 consisting of a cylinder block, cylinder head, etc. has a flywheel housing 41 at its rear end, and is located generally above the flywheel housing 41 and at the rear of the engine body 40. A supercharger 42 is arranged, and an alternator 4 is arranged near the top on the opposite side (front side).
3 is placed. Between the supercharger 42 and the alternator 43, an exhaust manifold 45 and a charge air cooling device 46 (intercooler) according to the present invention are connected to the crankshaft 47 on the upper side of the engine body 40.
(only the center line is shown), and a fresh water cooler 50 is provided along the upper end surface of the exhaust manifold 45. An intake air duct 51 attached to the charge air cooling device 46 extends generally above the supercharger 42 and behind the fresh water cooler 50, and has an outlet connected to the charge air inlet 13 (FIG. 2) of the charge air cooling device 46. There is. Further, the exhaust air duct 52 attached to the supply air cooling device 46 is the intake air duct 5.
1 , and its inlet is connected to the air supply outlet 14 (FIG. 2) of the air supply cooling device 46 .

A mixing elbow 55 is attached to the supercharger 42. The mixing elbow 55 is located behind the exhaust manifold 45 and the supply air cooling device 46, and a seawater pipe 56 is provided between the mixing elbow 55 and the fresh water cooler 50. The seawater pipe 56 connects the rear end of the fresh water cooler 50 and the front end of the mixing elbow 55, and seawater is supplied from the fresh water cooler 50 to the mixing elbow 55 via the seawater pipe 56. A seawater pipe 57 that supplies seawater to the fresh water cooler 50 is provided near the seawater pipe 56. Exhaust outlet 58 of mixing elbow 55
It opens rearward and diagonally downward, and is connected to an exhaust pipe (not shown).

Next, the operation will be explained. In FIG. 4, exhaust gas from the engine enters the turbine of the supercharger 42 through an exhaust pipe 54, drives the supercharger 42, and is then discharged from a mixing elbow 55 to an exhaust pipe (not shown). Further, the seawater supplied from the seawater pipe 57 to the fresh water cooler 50 cools the fresh water (cooling water) in the fresh water cooler 50, and then is sent to the mixing elbow 55 via the seawater pipe 56. This seawater mixes with the exhaust gas in the mixing elbow 55, reduces the thermal energy and noise energy of the exhaust gas, and is discharged together with the exhaust gas into the exhaust pipe.

On the other hand, the air sucked into the supercharger 42 is pressurized and then passed through the intake air duct 51 to the charge air cooling device 46.
flows into. Cooling water pipe 15 shown in FIGS. 1 and 2
The cooling water passes from the inlet side tank 19 to the outlet side tank 20. Air supply is at air supply inlet 13
is introduced into the cooler case 11 from the fin 1.
The air passes through the gap 6 from above to the lower chamber 24, turns around in the lower chamber 24, passes through the gap between the fins 16 again, and is discharged from the air supply outlet 14 to the exhaust air duct 52. During this time, the supply air is cooled by removing heat from the cooling water passing through the cooling water pipe 15, and is supplied to the combustion chamber from the exhaust air duct 52 via an air supply manifold (not shown).

Note that the sealing agent 30 maintains airtightness between the inner surfaces of the side walls of the partition 12 and the cooler case 11, and the side plates 25 and intermediate plates 26, so that the supply air does not pass through the gaps between them. do not have. That is, the supplied air reliably passes through the fins 16 and reaches the lower chamber 24, and from the lower chamber 24 it passes through the fins 16 again and is discharged. A certain heat exchange takes place.

(Effect of the invention) It has 15 groups of cooling water pipes, and each cooling water pipe 1
In an internal combustion engine charge air cooling system in which a core assembly through which the supply air passes through fins 16 disposed between fins 5 and 5 is inserted into a cooler case 11, a small amount of air that occurs between the core assembly and the cooler case 11 is used. By filling the sealing agent 30 into the gap, the passage of the supply air through the gap is prevented; the supply air reliably passes through the fins 16 to perform heat exchange, and the heat exchange efficiency is greatly improved. do.

To explain in detail, the upper part of the cooler case 11 is divided into upper chambers on the air supply inlet side and the air supply outlet side by the partition 12 and the intermediate plate 26 of the core assembly, etc.
The structure is such that the air supply enters the lower chamber 24 from the upper chamber on the air intake side of the cooler case 11 and is supplied to the engine through the upper chamber on the outlet side. Intermediate plate 2 of the inner peripheral surface of the side wall of the cooler case
A groove 27 extending in the vertical direction is formed in the upper part of both side ends of the partition 12, and a groove 28 opening downward facing the upper edge of the intermediate plate is formed in the partition 12, and a groove 28 is formed in the inner surface of the side wall parallel to the cooling water pipe. A continuous sealing agent 30 is formed in each of the grooves 27, 28, 29, and the sealing agent 30 seals the space between the partition 12 and the intermediate plate 26 and the side wall of the cooler case 11. This maintains airtightness between the inner surface, the side surface (side plate 25) of the core assembly, and the intermediate plate 26.

This prevents the air supply from passing between the upper chamber on the air supply inlet side and the upper chamber on the air supply outlet side in the cooler case 11.

Therefore, a normal flow of air supply in the cooler case 11, that is, a flow from the upper chamber on the inlet side to the upper chamber on the outlet side via the lower chamber can be ensured well, and the heat exchange efficiency is greatly improved.

As a result, the supply air cooling device itself can be made smaller, and therefore, even if it is installed outside the exhaust manifold, the overhang can be reduced. Dead space can be used effectively, and the internal combustion engine itself can be made more compact.

Furthermore, since the configuration is extremely simple, it is easy to adopt and does not require high costs. (Another Embodiment) A round pipe can also be used as the cooling water pipe 15. However, if the cooling water pipe 15 having a flat annular cross section is used, it is possible to prevent the supply air from stagnation on the downstream side of the cooling water pipe 15, thereby increasing the heat exchange efficiency.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of the supply air cooling device according to the present invention, which corresponds to the − cross section in FIG.
3 are a view in the direction of the arrows in FIG. 1 and a view in the direction of the arrows, and FIG. 4 is a schematic side view of an internal combustion engine employing the charge air cooling device according to the present invention. 11...Cooler case, 15...Cooling water pipe,
16...fin, 30...sealant.

Claims (1)

[Claims] 1 has a cooling water pipe group and each cooling water pipe 15
In a charge air cooling system for an internal combustion engine, a core assembly through which the supply air passes through fins arranged between the cooler case 1 and the cooler case 1 is inserted into the cooler case 11.
The core assembly is provided with a side plate 25 and an intermediate plate 26 that divides the upper part of the cooler case 11 at the middle part in the length direction of the cooling water pipe. The upper part of the cooler case 11 is divided into an upper chamber on the air supply inlet side and an upper chamber on the air supply outlet side, and a portion of the inner circumferential surface of the side wall of the cooler case 11 corresponding to the upper part of both side ends of the intermediate plate 26 is provided with a chamber extending in the vertical direction. An extending groove 27 is formed, and the partition 12 has a groove 2 that opens downward facing the upper edge of the intermediate plate.
A groove 29 extending parallel to the cooling water pipe 15 is formed on the inner surface of the side wall, and each of the grooves 27, 28, 2
9 is continuously filled with a sealant 30, and the sealant 30 maintains airtightness between the partition 12 and the upper end of the intermediate plate 26 and between the inner surface of the side wall of the cooler case 11 and the intermediate plate 26 and the side plate 25. An internal combustion engine charge air cooling device characterized by: