JP2014196725A - Intake air cooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake air cooler capable of suppressing frosting of water contained in intake air while decreasing the number of components and achieving space saving.SOLUTION: An intercooler 4 comprises: a frame 10 having an intake air inlet port 11 and an intake air outlet port 12; a plurality of intake air cooling paths 16 arranged in the frame body 10, for flowing intake air from the intake air inlet port 11 toward the intake air outlet port 12; a plurality of heat exchangers 17 arranged in the frame body 10, and cooling the intake air flowing in the intake air cooling paths 16 by heat exchange between the intake air and cooling air; and a bypass path 18 arranged in the frame body 10 to bypass the respective intake air cooling paths 16, for flowing the intake air from the intake air inlet port 11 toward the intake air outlet port 12. An windbreaking plate 20 shielding the cooling air from the bypass path 18 is provided so as to cover an entire front surface of the bypass path 18 and not to contact the bypass path 18.

Description

  The present invention relates to an intake air cooling device that cools intake air supplied to an engine.

  An intake air cooling device (intercooler) is a device that is provided in an intake passage that connects a compressor of a turbocharger and an engine, and cools high-temperature intake air supplied to the engine. In a cold region, moisture contained in the intake air may freeze in the intercooler, the intake passage may be blocked, and the vehicle may not be able to run. As a countermeasure, for example, as described in Patent Document 1, a bypass passage that bypasses the intercooler and short-circuits the compressor and the engine is connected to the intake passage, so that moisture in the intake air is contained in the intercooler. There is known a technique for preventing freezing at the time.

JP-A-8-14111

  However, in the above prior art, the number of parts is increased by adding a bypass passage outside the intercooler. In addition, a space for disposing a bypass passage outside the intercooler is required.

  An object of the present invention is to provide an intake air cooling device capable of suppressing freezing of moisture contained in intake air while reducing the number of parts and saving space.

  The present invention relates to an intake air cooling device for cooling intake air supplied to an engine, a frame having an air introduction part for introducing intake air and an air outlet part for deriving intake air, An intake cooling passage for flowing intake air from the air introduction portion toward the air outlet portion, a heat exchange portion arranged in the frame and exchanging heat with the cooling air for the intake air flowing through the intake cooling passage, and intake air A heat exchanger and a space are arranged in the frame so as to bypass the cooling passage, and a bypass passage for flowing the intake air from the air introduction portion toward the air outlet portion, the front surface of the bypass passage being covered, and It is provided so that it may not contact with a bypass passage, and is provided with the wind-proof plate for shielding a cooling wind with respect to a bypass passage.

  Thus, in the intake air cooling device of the present invention, the number of parts is reduced by disposing the bypass passage for flowing the intake air from the air introduction portion toward the air outlet portion separately from the intake air cooling passage. The Further, a space for disposing a bypass passage outside the intake air cooling device is not necessary.

  Further, by disposing the bypass passage with a space from the heat exchanging portion, the intake air flowing through the bypass passage is prevented from being cooled by heat exchange by the heat exchanging portion. Furthermore, by providing a windproof plate for blocking the cooling air from the bypass passage so as to cover the front surface of the bypass passage and not in contact with the bypass passage, the cooling air hits the windbreak plate. Never reach. Accordingly, since the bypass passage is prevented from being cooled by the cooling air, cooling of the intake air flowing through the bypass passage is further prevented. As described above, freezing of moisture contained in the intake air supplied to the engine can be suppressed.

  Preferably, the windproof plate is made of the same metal material as the frame and the heat exchange part. In this case, since the frame body, the heat exchanging portion, and the windproof plate can be assembled together by brazing or the like, the intake air cooling device can be easily and inexpensively manufactured. In addition, when the windbreak plate is formed of a material different from that of the frame body and the heat exchange part, the erosion of the frame body and the heat exchange part occurs due to the contact between the windbreak plate and the frame body and the heat exchange part. Since the plate is made of the same metal material as the frame and the heat exchange part, it is possible to prevent the occurrence of electrolytic corrosion.

  At this time, the windproof plate is preferably fixed to the heat exchanging portion. In this case, the windbreak plate has not only a function of blocking the cooling air from the bypass passage but also a function of holding the heat exchange part.

  The windproof plate preferably has an L-shaped cross section or a substantially L-shaped cross section. In this case, the function of blocking the cooling air from the bypass passage and the function of holding the heat exchange part can be realized with a simple structure.

  According to the present invention, freezing of moisture contained in intake air can be suppressed and blockage of an intake passage connected to an engine can be prevented while reducing the number of parts and saving space.

It is a schematic structure figure showing an engine system provided with one embodiment of an intake air cooling device (intercooler) concerning the present invention. It is a front view of the intercooler shown in FIG. FIG. 3 is an enlarged rear view of a lower portion of the intercooler shown in FIG. 2 on the intake introduction chamber side. It is the IV-IV sectional view taken on the line of FIG. It is sectional drawing which shows the modification of the windproof plate shown in FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a preferred embodiment of an intake air cooling device according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic configuration diagram showing an engine system including an embodiment of an intake air cooling apparatus according to the present invention. In the figure, an engine system 1 cools an engine 2, a turbocharger 3 that supercharges the engine 2, and high-temperature intake air that is supplied to the engine 2 from a compressor (not shown) of the turbocharger 3. An intake air cooling device (intercooler) 4 of this embodiment is provided.

  The compressor of the turbocharger 3 and the intercooler 4 are connected via an intake passage 5, and the intercooler 4 and the engine 2 are connected via an intake passage 6. A throttle valve 7 is provided in the intake passage 6. An intake passage 8 is connected to the upstream side of the turbocharger 3. An air cleaner 9 is provided in the intake passage 8.

  FIG. 2 is a front view of the intercooler 4. In the figure, the intercooler 4 has a frame 10 formed of a metal material (here, aluminum). An intake inlet 11 for introducing intake air is formed at the lower end of the frame 10, and an intake outlet 12 for extracting intake air is formed at the lower end of the other end of the frame 10. . The intake passage 11 is connected to the intake passage 11, and the intake passage 6 is connected to the intake outlet 12.

  An intake introduction chamber 13 that communicates with the intake introduction port 11 is formed on one end side of the frame body 10, and an intake derivation chamber 14 that communicates with the intake extraction port 12 is formed on the other end side of the frame body 10. . An intake cooling unit 15 is disposed in the frame body 10.

  The intake air cooling unit 15 has a plurality of intake air cooling passages 16 extending from one end side of the frame body 10 toward the other end side. The intake air cooling passage 16 communicates with the intake introduction chamber 13 and the intake outlet chamber 14 and is a passage for flowing intake air from the intake inlet 11 toward the intake outlet 12.

  Further, the intake air cooling unit 15 has a plurality of heat exchange portions 17 extending from one end side of the frame body 10 toward the other end side. These heat exchanging parts 17 are arranged so as to sandwich the intake air cooling passage 16. The heat exchange unit 17 cools the intake air flowing through the intake air cooling passage 16 by exchanging heat with the cooling air. The cooling air is taken from the front side of the intercooler 4. The heat exchange unit 17 is attached to the frame body 10. The heat exchange part 17 is comprised with the fin which thermally radiates the heat of intake air. The heat exchanging portion 17 is formed of the same metal material (here, aluminum) as the frame body 10. An inner fin is also disposed in the intake air cooling passage 16 (not shown).

  Under the intake air cooling unit 15 in the frame body 10, as shown also in FIGS. 3 and 4, it extends from one end side of the frame body 10 toward the other end side so as to bypass each intake air cooling passage 16. A bypass passage 18 is disposed. 3 is an enlarged rear view of the lower portion A of the intercooler 4 shown in FIG. 2 on the intake air introduction chamber 13 side.

  The bypass passage 18 is a passage through which the intake air flows from the intake inlet 11 toward the intake outlet 12 through the intake inlet chamber 13 and the intake outlet chamber 14. The bypass pipe 19 that forms the bypass passage 18 is made of the same metal material (here, aluminum) as the frame body 10. The bypass pipe 19 is fixed to a lower frame 10 a that constitutes a part of the frame body 10.

  The bypass pipe 19 is disposed with a space between the heat exchange section 17 adjacent to the upper part of the bypass pipe 19. That is, the bypass pipe 19 is not in contact with the heat exchange unit 17 adjacent to the upper part of the bypass pipe 19. As a result, the intake air flowing through the bypass passage 18 is not cooled by heat exchange by the heat exchange unit 17.

  On the front side of the bypass pipe 19, a windproof plate 20 having an L-shaped cross section for blocking cooling air from the bypass pipe 19 is provided so as to cover the entire front face of the bypass pipe 19. The windproof plate 20 is disposed so as not to contact the bypass pipe 19. Thereby, even if the windbreak plate 20 is cooled by the cooling wind hitting the windbreak plate 20, the bypass pipe 19 is not cooled, so that the intake air flowing through the bypass passage 18 is prevented from being cooled.

  Further, by making the shape of the windproof plate 20 L-shaped in cross section, the space of the windproof plate 20 need not be large on the front side of the bypass pipe 19. The windproof plate 20 is formed of the same metal material (here, aluminum) as the frame body 10 and the heat exchange unit 17.

  The windproof plate 20 is supported by the frame 10 at both ends, and is fixed to the lower surface of the heat exchange unit 17 adjacent to the upper part of the bypass pipe 19. In other words, the windbreak plate 20 has a function of holding the heat exchange unit 17 adjacent to the upper part of the bypass pipe 19 in addition to the function of shielding the cooling air from the bypass pipe 19.

  When manufacturing such an intercooler 4, the frame 10, the heat exchange unit 17, the bypass pipe 19 and the windproof plate 20, all made of the same metal material, are integrally formed and assembled by brazing in a furnace, for example. To do.

  As described above, in the present embodiment, since the bypass pipe 19 that forms the bypass passage 18 is provided inside the intercooler 4, a space for arranging the bypass pipe outside the intercooler 4 becomes unnecessary. , Space can be saved. Further, since it is not necessary to prepare a bypass pipe separately from the intercooler 4, the total number of parts of the engine system 1 can be reduced, and an increase in assembly man-hours can be suppressed. Furthermore, when the specifications are divided into those for normal use and those for cold districts, two types of intercoolers such as an intercooler without the bypass passage 18 and an intercooler 4 with the bypass passage 18 can be prepared, and extra parts are required. Is not required. Therefore, cost reduction can be achieved.

  Further, since the windproof plate 20 for preventing the cooling air from hitting the bypass pipe 19 is provided so as to cover the front surface of the bypass pipe 19 and not to contact the bypass pipe 19, the bypass pipe 19 is cooled by the cooling air. It is prevented. Therefore, since cooling of the intake air flowing through the bypass passage 18 is prevented, freezing of moisture contained in the intake air supplied to the engine 2 can be suppressed. Thereby, the malfunction that the intake passage 6 is obstruct | occluded and a vehicle cannot drive | work can be prevented.

  Here, in the case where the bypass passage 18 is provided inside the intercooler 4, in order to prevent moisture in the intake air flowing through the bypass passage 18 from being frozen, the periphery of the bypass pipe 19 that forms the bypass passage 18 is covered with a heat insulating material. Can be considered. However, ethylene-propylene-diene rubber (EPDM), urethane, or the like is often used as the material for the heat insulating material. For this reason, it leads to a cost increase and there is a problem that the heat insulating material is deteriorated over time. Further, due to the different material contact between the bypass pipe 19 made of a metal material (aluminum or the like) and the heat insulating material, electrolytic corrosion (corrosion due to electrochemical action) of the metal material forming the bypass pipe 19 may occur.

  On the other hand, in this embodiment, since the frame body 10, the heat exchange part 17, the bypass piping 19, and the windproof plate 20 are all formed of the same metal material (here, aluminum), the manufacture of the intercooler 4 using brazing or the like. Can be easily performed, and further cost reduction can be achieved. In addition, it is possible to prevent the aging of parts constituting the intercooler 4 and the electrolytic corrosion of the metal material forming the bypass pipe 19.

  The present invention is not limited to the above embodiment. For example, in the above embodiment, the windproof plate 20 has an L-shaped cross section, but the windproof plate 20 has a cross section extending obliquely downward on the front side of the bypass pipe 19 as shown in FIG. It may be substantially L-shaped. In this case, the cooling air hitting the windproof plate 20 flows smoothly upward along the windproof plate 20.

  Further, in the above embodiment, the intake outlet 12 is formed in the lower portion of the frame body 10 and the bypass passage 18 is disposed on the lower side of the intake air cooling unit 15 in the frame body 10, but the configuration is not particularly limited. The intake air outlet 12 may be formed in the upper part of the frame body 10, and the bypass passage 18 may be disposed above the intake air cooling unit 15 in the frame body 10. In short, it is desirable to arrange the bypass passage 18 in the vicinity of the intake outlet 12 so that the cooled intake air flowing through the intake cooling passage 16 and the intake air flowing through the bypass passage 18 are not likely to be mixed. The place where the intake air inlet 11 is disposed may be in the vicinity of the bypass passage 18 or away from the bypass passage 18.

  Furthermore, in the above-described embodiment, a plurality of intake cooling passages 16 and heat exchange portions 17 are provided in the frame body 10, but the number of intake cooling passages 16 and heat exchange portions 17 is one by one. Also good.

  Moreover, in the said embodiment, although the windbreak plate 20 has the function to hold | maintain the heat exchange part 17 adjacent to the upper part of the bypass piping 19, such a function may not be in particular. That is, a structure in which each heat exchanging portion 17 is supported only by the frame body 10 may be employed.

  Further, the intercooler 4 of the above embodiment cools the intake air supplied to the engine 2 of the vehicle, but the present invention is also applied to the one that cools the intake air supplied to an engine other than the vehicle. Is possible.

  DESCRIPTION OF SYMBOLS 2 ... Engine, 4 ... Intercooler (intake air cooling device), 10 ... Frame, 11 ... Intake inlet (intake inlet), 12 ... Intake outlet (intake outlet), 16 ... Intake cooling passage, 17 ... Heat Exchange part, 18 ... bypass passage, 20 ... windproof plate.

Claims (4)

In the intake air cooling device that cools the intake air supplied to the engine,
A frame having an air introduction part for introducing the intake air and an air lead-out part for deriving the intake air;
An intake air cooling passage that is arranged in the frame and allows the intake air to flow from the air introduction portion toward the air outlet portion;
A heat exchanging unit arranged in the frame and exchanging heat with the cooling air for the intake air flowing through the intake cooling passage;
A bypass passage, which is disposed in the frame so as to bypass the intake air cooling passage with a space from the heat exchanging portion, and flows the intake air from the air introduction portion toward the air outlet portion;
An intake air cooling apparatus comprising: a windproof plate provided so as to cover a front surface of the bypass passage and not in contact with the bypass passage, and blocking the cooling air from the bypass passage.   The intake air cooling device according to claim 1, wherein the windproof plate is made of the same metal material as the frame and the heat exchange unit.   The intake air cooling device according to claim 1 or 2, wherein the windbreak plate is fixed to the heat exchange part.   The intake air cooling device according to claim 3, wherein the windproof plate has an L-shaped cross section or a substantially L-shaped cross section.

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