JP6314772B2 - Air intake duct - Google Patents

Description

  The present invention relates to an intake duct for cooling an on-vehicle battery.

  In recent years, the number of electric vehicles and hybrid vehicles that travel using electric energy has increased. A secondary battery is mounted on the bottom of the compartment of the automobile. Since the secondary battery generates heat during operation, it is necessary to cool it by supplying air. Therefore, an air intake duct for supplying air in the passenger compartment to the battery is disposed below the rear seat of the automobile. One end of the intake duct has an air intake portion that opens to the side of the rear seat of the automobile, and the other end of the intake duct opens to a battery mounting portion on which a battery is mounted. A blower is provided in the vicinity of the air intake portion of the intake duct to actively send air toward the inside of the intake duct.

  However, the air intake portion of the intake duct opens to the side of the rear seat in the passenger compartment. There is a risk that moisture may enter the intake duct depending on conditions such as raising and lowering the vehicle. If moisture enters the intake duct and moisture contacts the battery, it may cause battery failure.

  As a conventional technique for preventing moisture contact with a battery, Patent Document 1 proposes providing a water absorbing member between an air intake duct and a battery case that houses the battery. Further, as shown in FIG. 8, Patent Document 2 discloses that a part of an air intake portion 92 of an intake duct 91 is covered with a closing plate 93 made of sponge. A sound absorbing sheet 95 is disposed on the bottom wall surface 94 located vertically below the air intake portion 92 of the intake duct 91.

JP 2009-87646 A JP 2006-228556 A

  However, the water-absorbing member disclosed in Patent Document 1 covers the battery-side opening of the intake duct and increases the pressure loss of the air. For this reason, there exists a possibility that the cooling efficiency of a battery may become low. As shown in FIG. 8, the closing plate 93 of Patent Document 2 covers a part of the air intake portion 92, so that the pressure loss is reduced. Further, moisture may enter from a portion of the air intake portion 92 that is not covered with the closing plate 93. Moisture that has not been absorbed by the blocking plate 93 may be absorbed by the sound absorbing sheet 95 disposed on the bottom wall surface 94 of the intake duct 91. However, Patent Document 2 does not disclose the material of the sound absorbing sheet 95. The sound absorbing sheet 95 has sound absorbing performance, but does not necessarily have water absorbing performance.

  The present invention has been made in view of such circumstances, and provides an in-vehicle battery cooling intake duct that can suppress the movement of moisture entering the battery side from the air intake without reducing pressure loss. This is the issue.

  The in-vehicle battery cooling intake duct according to the present invention includes a first opening that opens toward an air intake portion of a vehicle, a second opening that opens toward a battery mounting portion on which a battery is mounted, the first opening, and the first opening. A duct main body having a communication path connecting two openings, and a water absorbing member disposed in the communication path and having a concavo-convex portion on a surface facing the communication path.

  According to the said structure, the water absorption member is arrange | positioned in a communicating path, and the uneven | corrugated | grooved part is formed in the surface facing the communicating path of a water absorbing member. For this reason, a water absorption member absorbs the water which contacted the surface of the water absorption member. Furthermore, by forming the concavo-convex portion on the surface of the water absorbing member, the surface contact area with water increases, and the amount of water that can be absorbed by the water absorbing member can be increased. For this reason, the movement of the water which flows on the surface of a water absorption member can be suppressed. As a result, water can be effectively suppressed from moving to the second opening on the battery side.

  The duct body has a bent portion that bends so as to change a fluid flow direction from the first opening to the second opening in the communication path, and the bent portion is on an outer side with respect to the bend of the bent portion. It is preferable that the water absorbing member is disposed. The water that has entered the intake duct tends to flow on the outer inner surface with respect to the bending portion. By disposing the water absorbing member in this portion, water that has entered the intake duct can be effectively absorbed by the water absorbing member.

  In the case where the water absorbing member is disposed outside the bent portion, the duct body includes an upstream portion positioned on the first opening side with respect to the bent portion and the second portion with respect to the bent portion. Having a downstream portion located on the opening side, where A is the inclination angle of the upstream axis with respect to the vertical line, and B is the inclination angle of the downstream axis with respect to the vertical line, the bent portion is A < It is preferable to bend so as to have a relationship of B.

  In the intake duct having such a shape, the inclination of the downstream portion with respect to the horizontal plane is gentler than the inclination of the upstream portion. The flow rate of water is slower in the downstream part than in the upstream part. In the bent portion between the upstream portion and the downstream portion, the flow of water that has entered the intake duct gradually slows down. By disposing the water absorbing member on the outside of the bent portion, it is possible to effectively absorb the water whose flow rate is decreasing.

  It is preferable that the uneven portion of the water absorbing member has a slit extending in a direction not parallel to the axial direction of the communication path. The water that has entered the intake duct flows in the axial direction of the communication path. The water that has entered the intake duct enters the slit and flows in the direction in which the slit extends. The slit extends in a direction not parallel to the axial direction of the communication path. For this reason, it can prevent that water flows into the axial direction of a communicating path by entering into a slit. Even when water overflows from the slit, the slit acts as a resistance to the flow in the axial direction of the water communication path, and prevents the flow of water to the battery side.

  The slit preferably extends in a direction orthogonal to the axial direction of the communication path. In this case, the flow of water in the axial direction of the communication path can be most effectively prevented.

  It is preferable that a plurality of the slits are arranged on the surface of the water absorbing member at a predetermined interval in the axial direction of the communication path. The surface of the water absorbing member has a concavo-convex portion on a relatively wide portion, and the water absorbing performance of the water absorbing member is further improved.

  The water absorbing member is preferably made of a nonwoven fabric. The water absorbing member can absorb water as a whole.

  When the water absorbing member is made of a nonwoven fabric, it is preferable that a plurality of slits formed by needle punching is formed on the surface of the water absorbing member. A needle piercing trace remains at the bottom of the slit formed by needle punching. The needle piercing trace has a lower fiber density than the portion of the water absorbing member other than the needle piercing trace and is easy to absorb water. For this reason, the slit can further increase the water absorption of the water absorbing member.

  The intake duct preferably has the communication path on the front surface side of the water absorbing member and has a water storage portion on the back surface side of the water absorbing member. The water absorbed by the water absorbing member can be stored in the water storage section on the back side of the water absorbing member. Furthermore, movement of much water can be suppressed.

  It is preferable that the water absorbing member is disposed in the communication path so that the surface of the water absorbing member extends in parallel with the axial direction of the communication path. The water absorbing member arranged in this way does not hinder the flow of air in the communication path. For this reason, the movement of water can be suppressed while reducing the pressure loss of the air.

  It is preferable that at least the downstream peripheral end portion of the peripheral edge portion of the surface of the water absorbing member is located at the same height as the inner surface of the intake duct. The peripheral edge on the surface of the water absorbing member is positioned at the same height as the inner surface of the intake duct, so that the air flow is not hindered between the peripheral edge and the inner surface of the intake duct. For this reason, a pressure loss can be made low. In particular, if there is a height difference between the peripheral edge portion on the downstream side of the peripheral portion of the surface of the water absorbing member and the inner surface of the intake duct, the air resistance in the communication passage tends to increase. By positioning at least the downstream peripheral edge at the same height as the inner surface of the intake duct, an increase in air resistance can be effectively suppressed and pressure loss can be effectively reduced.

  Since the present invention has the above-described configuration, it is possible to provide an in-vehicle battery cooling air intake duct that can suppress the movement of moisture from the air intake portion to the battery side without reducing pressure loss. it can.

It is a perspective view of the rear seat for showing the air intake part of Example 1 of the present invention. It is AA arrow sectional drawing of FIG. 1 is a cross-sectional view of an intake duct according to Embodiment 1. FIG. 1 is an exploded perspective view of an intake duct according to Embodiment 1. FIG. It is a section explanatory view of a water absorption member in Example 1. It is a plane explanatory view of a water absorption member in Example 1. 6 is a cross-sectional view of an intake duct according to Embodiment 2. FIG. It is sectional drawing of the air intake duct of a prior art example.

  An intake duct according to an embodiment of the present invention will be described in detail.

  The intake duct of the present invention is a duct for supplying air to a battery mounting portion of a vehicle for cooling an in-vehicle battery. The intake duct includes a duct body and a water absorbing member. The duct body includes a first opening that opens to the air intake portion side of the vehicle, a second opening that opens to the battery mounting portion side of the vehicle, and a communication path that connects the first opening and the second opening.

  The air intake part of the vehicle is not particularly limited as long as it is a part suitable for taking in air in the vehicle. For example, the lower part of the seat in the vehicle interior, the side part, the interior part of the vehicle interior, the inside of the front grill outside the vehicle interior There are parts. The battery mounting portion refers to a portion where a battery is mounted in the vehicle, such as a lower portion of a vehicle body. The air intake part and / or the battery mounting part may be provided with a blower for actively taking air toward the intake duct or the battery mounting part.

  The duct body may have a bent portion that is bent so as to change a fluid flow direction from the first opening toward the second opening in the communication path. The duct body may extend linearly from the first opening to the second opening. In the case where the duct body has a bent portion, a water absorbing member may be disposed in the bent portion. In the case where a plurality of bent portions are provided in the duct body, the water absorbing member may be disposed at the most upstream bent portion. The bent portion where the water absorbing member is disposed may be bent so that the axis of the communication path with respect to the vertical line changes. Here, the vertical line means a straight line extending in the vertical direction.

  Further, when the water absorbing member is disposed outside the bent portion, the angle of inclination of the upstream axis L1 with respect to the vertical line X on the upstream side of the bent portion is A, and the downstream side of the bent portion. When the inclination angle of the axis L2 of the downstream portion with respect to the vertical line X is B, the bent portion is preferably bent so as to have a relationship of A <B. Here, the upstream side refers to the first opening side of the duct body, and the downstream side refers to the second opening side of the duct body. A vertical line means a straight line extending in a direction perpendicular to the horizontal plane. Since the upstream part of the duct body has a large inclination with respect to the horizontal plane and the downstream part has a gentle inclination, the flow rate of water in the upstream part is faster than the flow rate of water in the downstream part. The bent portion is a portion where the flow rate of water gradually decreases. In this bent portion, water tends to flow along the outer inner surface with respect to the bent portion. Therefore, by disposing the water absorbing member outside the bent portion, water can be absorbed efficiently, and the flow of water can be stopped at the bent portion.

  In the case of having the relationship of A and B described above, the angle C formed by the upstream portion and the downstream portion, that is, the degree of bending of the bent portion is preferably 90 ° or more and 150 ° or less, and more preferably 100 ° or more and 130 °. The following is preferable. In this case, the water flowing from the upstream portion is absorbed by the water absorbing member facing the lower side in the vertical direction of the upstream portion at the bent portion, so that the water flow can be reliably stopped.

  The water absorbing member is preferably arranged in the communication path so that the surface of the water absorbing member extends in parallel with the axial direction of the communication path. In this case, the water absorbing member does not hinder the air flow in the communication path, and pressure loss can be prevented. But the water absorption member may be arrange | positioned at the communicating path so that the surface of a water absorbing member may spread in the direction which inclines with respect to the axial direction of a communicating path. In this case, it is only necessary to sufficiently ensure the size of the radial cross section of the portion where the water absorbing member is disposed in the communication path.

  At least the peripheral end on the downstream side of the peripheral edge of the surface of the water absorbing member may be located at the same height as the inner surface of the intake duct. This is to suppress pressure loss without disturbing the air flow between the downstream peripheral end portion of the surface of the water absorbing member and the inner surface of the intake duct.

  In the case where the duct main body has a bent portion, the water absorbing member may be disposed in the bent portion. The water absorbing member is preferably disposed at a portion including the bent portion in the duct main body, and is further disposed from the bent portion to the downstream portion downstream of the bent portion in the duct main body. It is preferable. In this case, the water absorbing member can be disposed over a wide range, and more water can be absorbed. In particular, by disposing the water absorbing member from the bent portion to the downstream portion, it is possible to reliably absorb the water that has flown to the downstream side without failing to absorb water at the portion disposed in the bent portion of the water absorbing member. Water movement can be more reliably suppressed.

  It is preferable that a water storage section capable of storing water is provided on the back surface side of the water absorbing member. Water that has passed through the water absorbing member from the front surface to the back surface accumulates in the water storage section. For this reason, when there exists a water storage part, the movement of much water can be suppressed compared with the case where there is no water storage part.

  The water absorbing member may be a material having a property capable of absorbing water. The water absorbing member is, for example, a sheet shape. The water absorbing member is made of, for example, a resin, a metal, or an inorganic material. In particular, the water absorbing member may be formed of a nonwoven fabric, a woven fabric, a foamed resin, a porous metal, a porous inorganic material, or the like. This is because water-absorbing members made of these materials have holes penetrating from the front surface to the back surface and can absorb a large amount of water. Moreover, when the water storage part is formed in the back surface side of the water absorption member, the water absorbed from the surface can be poured into the water storage part of the back surface side through a hole.

  The water absorbing member has a front surface and a back surface. An uneven portion is formed on at least the surface of the water absorbing member. Uneven portions may be formed not only on the surface of the water absorbing member but also on the back surface.

  This uneven part has a recessed part and a convex part. The recess may have a size that allows water to enter. The height difference of the concavo-convex portion is preferably from 0.3 mm to 1.8 mm, and more preferably from 0.8 mm to 1.3 mm. When the height difference of the uneven portion is too small, there is a possibility that the water flow resistance on the surface of the water absorbing member cannot be increased. When the unevenness of the uneven portion is excessive, the rigidity in the thickness direction of the water absorbing member may be reduced.

  This uneven | corrugated | grooved part is formed with the slit, hole, etc. which were formed in the surface of a water absorbing member, for example. The slit has an elongated shape in the planar direction of the surface of the water absorbing member. The slit may be, for example, linear, wave shape, or dotted line shape.

  Although only one slit may be formed on the surface of the water absorbing member, a plurality of slits may be formed. The extending direction of the slit may be a direction that is not parallel to the axial direction of the communication path on the surface of the water absorbing member. That is, the extending direction of the slit may be a direction inclined with respect to the axial direction of the communication path on the surface of the water absorbing member. The inclination angle of the slit extending direction with respect to the axial direction of the communication path is preferably 30 ° to 150 °, more preferably 60 ° to 120 °. The inclination angle is most preferably 90 °. In this case, the extending direction of the slit is a direction orthogonal to the axial direction of the communication path. Since the slit extending direction is inclined with respect to the axial direction of the communication path, the unevenness of the surface of the water-absorbing member that forms the slit increases the water flow resistance, increases the contact area with water, and the water flows downstream. It can be effectively prevented from flowing to the side. The extending direction of the slit may be linear or may be bent.

  When a plurality of slits are formed on the surface of the water absorbing member, it is preferable that the slits are arranged in parallel at a predetermined interval with a predetermined interval therebetween. The flow resistance of water on the surface of the water absorbing member is increased in a wide range, and the movement of water downstream can be effectively suppressed.

  When one or more slits are formed on the surface of the water absorbing member, the depth D of the slits is preferably 0.3 mm or more and 1.8 mm or less, and more preferably 0.8 mm or more and 1.3 mm or less. Preferred (FIG. 5). When the depth D of the slit is too small, there is a possibility that the water flow resistance on the surface of the water absorbing member cannot be increased. When the depth D of the slit is excessive, the rigidity in the thickness direction of the water absorbing member may be reduced.

  When one or a plurality of slits are formed on the surface of the water absorbing member, it is preferable that the slits extend from one end of the water absorbing member to the other end (FIG. 6). If the length L in the extending direction of the slit is too small, the water flow resistance on the surface of the water absorbing member may not be increased.

  The length L in the extending direction of the slit is preferably the same as the width of the water absorbing member. It is preferable that both ends of the slit extending direction reach opposite side ends of the water absorbing member. In this case, the water that has flowed through the slit flows to the opposite end portions of the water absorbing member. When the water storage part is formed in the back surface of a water absorption member, the water which flowed to the both ends which the water absorption member opposes accumulates in a water storage part.

  When one or more slits are formed on the surface of the water-absorbing member, the slit width H is preferably 0.3 mm or more and 0.8 mm or less, and more preferably 0.4 mm or more and 0.7 mm or less (FIG. 6). When the width H of the slit is too small, the amount of water that can be accommodated in the slit is small, and the flow resistance of water on the surface of the water absorbing member may not be increased. When the width H of the slit is excessive, the pitch of the water absorbing member also increases, and there is a possibility that the water flow resistance on the surface of the water absorbing member cannot be increased.

  When a plurality of slits are formed on the surface of the water absorbing member, the pitch P of the slits is preferably 2.0 mm or more and 5.0 mm or less, and more preferably 3.0 mm or more and 4.0 mm or less (see FIG. 5). In this case, the water flow resistance on the surface of the water absorbing member can be effectively increased.

  One or a plurality of holes may be formed on the surface of the water absorbing member. When water enters the hole, the flow resistance of the water increases and the movement of water downstream can be suppressed. It is preferable that the holes are widely scattered on the surface of the water absorbing member. Water flow resistance across the entire surface of the water absorbing member can be increased.

  The cross-sectional shape in the radial direction of the hole is not particularly limited, such as a circle, an ellipse, or a rectangle. In the case where a plurality of holes are formed on the surface of the water absorbing member, it is preferable that the plurality of holes are scattered throughout the surface of the water absorbing member. The flow resistance of water over the entire surface of the water absorbing member can be increased.

  In order to form such an uneven portion on the surface of the water absorbing member, for example, when the water absorbing member is made of a nonwoven fabric, needle punching may be performed. Furthermore, when the water absorbing member is made of a thermoplastic resin or a foamed resin, a mold having an uneven surface and heated to a high temperature may be pressed against the surface of the water absorbing member. When the water absorbing member is made of a resin, it is preferable to perform extrusion molding or injection molding using a molding die having a mold surface having an uneven surface. Moreover, you may perforate in the surface of a water absorbing member.

Example 1
An intake duct for cooling an in-vehicle battery according to this embodiment will be described with reference to the drawings. In FIG. 1 and the subsequent drawings, “up”, “down”, “right”, “left”, “front”, and “rear” are directions as viewed from a passenger sitting on a vehicle seat. As shown in FIG. 1, the intake duct 10 of this example is located at the lower part of the rear seat 90. An air intake portion 90 b is formed in the lower portion 90 a of the rear seat 90.

  As shown in FIG. 2, the air intake portion 90b has a hood 90d. In the hood 90d, a plurality of ribs 90c are arranged at a predetermined interval. An introduction duct 4 is provided inside the air intake portion 90b. The introduction duct 4 extends from the upstream side to the middle part toward the rear side of the vehicle, bends in the middle, and extends toward the center part in the left-right direction of the vehicle (on the back side of the page in FIG. 2). The upstream side of the introduction duct 4 has an air intake portion 90b that opens toward the front side of the vehicle. A blower 90e that is driven by an electric motor is disposed at a portion of the introduction duct 4 that is bent. The downstream side of the introduction duct 4 is connected to the intake duct of this example. Due to the rotation of the blower 90e, the air in the passenger compartment is forcibly supplied to the intake duct 10 through the introduction duct 4.

  As shown in FIG. 3, the intake duct 10 includes a duct body 2 and a water absorbing member 5. The duct body 2 includes a first opening 21 that opens to the air intake portion 90b side, a second opening 22 that opens to the battery mounting portion side, a communication passage 23 that connects the first opening 21 and the second opening 22, Part 25.

  The first opening 21 is connected to the downstream end of the introduction duct 4. The second opening 22 is connected to a battery storage case that is provided in the battery mounting portion and stores the secondary battery. The communication path 23 is an air flow path that communicates from the first opening 21 to the second opening 22. The communication path 23 is surrounded by the inner surface of the duct body 2.

  As shown in FIGS. 3 and 4, the bent portion 25 is bent so as to change the fluid flow direction from the first opening 21 to the second opening 22 in the communication path 23. The inclination angle with respect to the vertical line X of the axis L1 of the upstream portion 26 upstream from the bent portion 25 is A, and the inclination angle with respect to the vertical line X of the axis L2 of the downstream portion 27 downstream of the bent portion 25 is B. In some cases, the bent portion 25 is bent so as to have a relationship of A <B. The inclination angle A of the axis L1 of the upstream portion 26 with respect to the vertical line X is approximately 30 °, and the inclination angle B of the axis L2 of the downstream portion 27 with respect to the vertical line X is approximately 90 °. The angle C formed by the upstream portion 26 and the downstream portion 27, that is, the degree C of bending of the bent portion 25 is approximately 120 °.

  The duct body 2 is branched at the bent portion 25. The upstream portion 26 upstream of the bent portion 25 of the duct body 2 has one communication passage 23, and the downstream portion 27 downstream of the bent portion 25 has two communication passages 23. The bent portion 25 is located at the branch portion 29 of the communication path 23 and is wider in the plane direction than the upstream portion 26 and the downstream portion 27.

  As shown in FIG. 4, the duct body 2 is formed by fitting a claw portion 2g formed on the periphery of the upper member 2a into an engagement hole 2h formed on the periphery of the lower member 2b. A mounting portion 2c having a hole for fixing the intake duct 10 to the vehicle body is formed at a central portion where the communication passage 23 of the lower member 2b is branched.

  The bent portion 25 is located in front of the branched portion of the communication path 23 and extends in the planar direction. The water absorbing member 5 is disposed in the bent portion 25 spreading in the planar direction. The water absorbing member 5 is a water absorbing sheet having a front surface 51 and a back surface 52. The shape of the water absorbing member 5 in the planar direction has a substantially triangular shape. The substantially triangular apex portion 5 a of the water absorbing member 5 faces the upstream portion 26, and the substantially triangular base portion 5 b faces the downstream portion 27.

  As shown in FIGS. 5 and 3, the surface 51 of the water absorbing member 5 extends in a substantially horizontal direction at the bent portion 25. The surface 51 of the water-absorbing member 5 covers the inner surface 24 that extends in the substantially horizontal direction on the outer side with respect to the bending of the bent portion 25 with a predetermined interval. The water absorbing member 5 extends from a portion directly below the upstream portion 26 in the bent portion 25 to the downstream side of the portion directly below. A gap 8 of several mm remains between the peripheral edge of the water absorbing member 5 and the inner surface 24 of the duct body 2.

  The water absorbing member 5 has through holes 5c at a plurality of locations. The through holes 5c are fitted with tips of a plurality of protrusions 24a protruding upward from the lower inner surface 24 of the lower member 2b of the duct body 2. The peripheral edge of the through-hole 5c of the water absorbing member 5 is held by a step portion 24b formed at the tip of the protrusion 24a. The water absorbing member 5 is pressed downward by a pressing rib 24e extending downward from the upper inner surface 24 of the upper member 2a with respect to the bending of the bent portion 25 of the duct body 2. Thereby, the water absorbing member 5 is held at a predetermined height from the lower inner surface 24 of the duct body 2.

  On the surface 51 side of the water absorbing member 5, a communication passage 23 for air circulation is formed between the upper side inner surface 24 of the duct body 2. On the back surface 52 side of the water absorbing member 5, a water reservoir 28 is formed between the lower inner surface 24 of the duct body 2. The water storage portion 28 is formed between the bent portion 25 and the standing wall 29 formed in the downstream portion 27 on the downstream side of the bent portion 25.

  As shown in FIGS. 5 and 6, the water absorbing member 5 is made of a nonwoven fabric. The surface 51 of the water absorbing member 5 has an uneven portion 55. The surface 51 of the water absorbing member 5 is formed with a slit 53 extending linearly in a direction orthogonal to the axial direction of the communication passage 23, and constitutes a concave portion of the concave and convex portion 55. A portion higher than the slit 53 adjacent to the slit 53 constitutes a convex portion of the concavo-convex portion 55.

  A plurality of slits 53 are arranged in parallel at equal intervals along the axial direction of the communication path 23. The extending direction of the slit 53 is orthogonal to the axial direction of the communication path 23. The slit 53 is V-shaped, and the width of the slit 53 is very narrow at the bottom and gradually increases toward the opening. The depth D of the slit 53 is 1.0 mm, the average width H from the bottom of the slit 53 to the opening is 0.5 mm, and the pitch P of the adjacent slits 53 is 3.3 mm. The thickness T of the water absorbing member is 5.0 mm. The length L in the extending direction of the slit 53 is the same as the width of the water absorbing member 5. As shown in FIG. 4, the actual width of the water absorbing member 5 varies depending on each part. The length L in the extending direction of the slit 53 differs depending on each part of the water absorbing member 5. Then, both end portions in the extending direction of the slit 53 are located at both end portions in the width direction of the water absorbing member 5.

  In order to produce the water absorbing member 5 having the slits 53, filaments are formed from polyester and rayon having good water absorption. The filament is cut into a length of about 50 mm to form a short fiber. Short fibers are entangled by needle punching to form a nonwoven fabric. Subsequently, the slit 53 is formed by moving the needle in a direction perpendicular to the needle planting direction while repeatedly piercing and drawing the nonwoven fabric with the needles arranged at a predetermined interval.

As shown in FIGS. 3 to 6, the intake duct 10 of the present example is disposed at the lower portion of the rear seat, and the air intake portion 90 b that opens to the passenger compartment is provided with a hood 90 d having a plurality of ribs 90 c. Thus, foreign matter and water are less likely to enter the intake duct 10. For this reason, normally, water does not enter the intake duct 10. However, water may enter the intake duct 10 beyond the rib 90c due to opening / closing of the door or carelessness of the passenger. Even in this case, in the intake duct 10 of this example, the water absorbing member 5 is disposed in the communication path 23 inside the duct body 2. For this reason, it can suppress that the water which entered the intake duct 10 moves to the battery side.
In particular, the water absorbing member 5 is disposed in the communication path 23, and an uneven portion 55 is formed on the surface 51 of the water absorbing member 5 facing the communication path 23. The concavo-convex portion 55 retains water that has contacted the surface 51 of the water absorbing member 5. Furthermore, by forming the uneven portion 55 on the surface 51 of the water absorbing member 5, the contact area of the surface 51 with water can be increased, and the amount of water that can be absorbed by the water absorbing member 5 can be increased. For this reason, the movement of the water flowing on the surface 51 of the water absorbing member 5 can be suppressed. As a result, it is possible to effectively suppress water from moving to the second opening 22 on the battery side.

  The water absorbing member 5 is disposed in the bent portion 25 of the duct body 2. The water that has entered the intake duct 10 tends to flow on the outer inner surface 24 with respect to the bending portion 25. By disposing the water absorbing member 5 in this portion, the water that has entered the intake duct 10 can be effectively absorbed by the water absorbing member 5.

  When the inclination angle of the axis L1 of the upstream portion 26 with respect to the vertical line X is A and the inclination angle of the axis L2 of the downstream portion 27 with respect to the vertical line X is B, the bent portion 25 has a relationship of A <B. It is bent. In the intake duct 10 having such a shape, the flow rate of water is slower in the downstream portion 27 than in the upstream portion 26. In the bent portion 25 between the upstream portion 26 and the downstream portion 27, the flow of water that has entered the intake duct 10 gradually slows down. By disposing the water absorbing member 5 on the outer side of the bent portion 25, it is possible to effectively absorb water whose flow rate is slowing down.

  The water that has entered the intake duct 10 flows in the axial direction of the communication passage 23. Therefore, the water that has entered the intake duct 10 enters the slit 53 and flows in the direction in which the slit 53 extends. The slit 53 extends in a direction orthogonal to the axial direction of the communication path 23. For this reason, it is prevented that it flows to the axial direction of the communicating path 23. FIG. Even when water overflows from the slit 53, the slit 53 provides resistance to the flow of water in the axial direction of the communication path 23. Further, by forming the concavo-convex portion 55 on the surface 51 of the water absorbing member 5, the contact area of the surface 51 with water also increases. For this reason, the flow of water to the battery side is prevented.

  The slit 53 is formed over the entire surface 51 of the water absorbing member 5. It will have the uneven | corrugated | grooved part 55 over the whole surface 51 of the water absorption member 5, and the water absorption performance of the water absorption member 5 further improves.

  The water absorbing member 5 is made of a nonwoven fabric. The water absorbing member 5 can absorb water as a whole.

  The slit 53 is formed by needle punching. A needle piercing trace remains on the bottom of the slit 53 formed by needle punching. The needle piercing trace has a lower fiber density than the portion of the water absorbing member 5 other than the needle piercing trace, and is easy to absorb water. For this reason, the slit 53 can further increase the water absorption of the water absorbing member 5.

A water storage section 28 is formed on the back surface 52 side of the water absorbing member 5. The water absorbed by the water absorbing member 5 can be stored in the water reservoir 28 on the back surface 52 side of the water absorbing member 5. According to the intake duct 10 of the present embodiment, more water movement can be suppressed.
The surface 51 of the water absorbing member 5 extends in parallel with the axial direction of the communication path 23. The water absorbing member 5 arranged in this way does not hinder the flow of air in the communication path 23. For this reason, the movement of water can be suppressed while reducing the pressure loss of the air.

  The downstream peripheral end portion of the surface 51 of the water absorbing member 5 is located at the same height as the inner surface 24 of the intake duct 10. The peripheral end portion on the downstream side of the surface 51 of the water absorbing member 5 is located at the same height as the inner surface 24 of the intake duct 10, so that the air flow is not hindered between the peripheral edge portion and the inner surface 24 of the intake duct 10. . For this reason, a pressure loss can be made low.

  Since the water of the blower 90e disposed on the upstream side of the intake duct 10 flows faster than the water absorption member 5 is absorbed by the air, the water does not stay in the same place. Improves.

  A gap 8 of several mm remains between the peripheral edge of the water absorbing member 5 and the inner surface 24 of the duct body 2. For this reason, the water flowing on the surface 51 of the water absorbing member 5 can be quickly flowed down to the water reservoir 28 through the gap 8.

(Example 2)
As shown in FIG. 7, the intake duct 10 of the present example is different from the first embodiment in that it does not have a water reservoir 28. In this example, the water absorbing member 5 is fixed to the outer inner surface 24 with respect to the bending of the bent portion 25 of the duct body 2.

  Although the intake duct 10 of this example does not have the water storage part 28, the movement to the downstream side of water can be effectively suppressed by the water absorption performance of the water absorption member 5 arrange | positioned at the bending part 25. FIG.

10: intake duct, 2: duct body, 21: first opening, 22: second opening, 23: communication path, 25: bent portion, 26: upstream portion, 27: downstream portion, 28: water storage portion, 5: water absorption Member, 51: front surface, 52: back surface, 53: slit, 55: concavo-convex part, 90b: air intake part

Claims (11)

A duct having a first opening that opens on the air intake portion side of the vehicle, a second opening that opens on the battery mounting portion side on which the battery is mounted, and a communication passage that connects the first opening and the second opening. The body,
An air intake duct having a concavo-convex portion on a surface thereof disposed in the communication path and corresponding to the communication path ,
The air intake duct for cooling an on-vehicle battery , wherein the air intake duct has the communication path on the front surface side of the water absorbing member and has a water storage portion on the back surface side of the water absorbing member . 2. The intake duct according to claim 1, wherein at least a downstream peripheral end portion of the peripheral portion of the surface of the water absorbing member is positioned at the same height as an inner surface of the intake duct. A duct having a first opening that opens on the air intake portion side of the vehicle, a second opening that opens on the battery mounting portion side on which the battery is mounted, and a communication passage that connects the first opening and the second opening. The body,
  An air intake duct having a concavo-convex portion on a surface thereof disposed in the communication path and corresponding to the communication path,
The air intake duct for cooling an in-vehicle battery, wherein at least a downstream peripheral end portion of the peripheral portion of the surface of the water absorbing member is located at the same height as an inner surface of the intake duct. The duct body has a bent portion that bends so as to change a fluid flow direction from the first opening toward the second opening in the communication path,
The intake duct according to any one of claims 1 to 3 , wherein the water absorbing member is disposed outside the bent portion with respect to the bent portion. The duct body has an upstream portion located on the first opening side with respect to the bent portion and a downstream portion located on the second opening side with respect to the bent portion, and the axis of the upstream portion with respect to a vertical line. The intake duct according to claim 4 , wherein when the inclination angle is A and the inclination angle of the axis of the downstream portion with respect to a vertical line is B, the bent portion is bent so as to have a relationship of A <B. The uneven portion of the water-absorbing member is an intake duct according to any one of claims 1 to 5 having a slit extending in the axial direction and not parallel direction of the communication path. The intake duct according to claim 6, wherein the slit extends in a direction orthogonal to an axial direction of the communication path. The intake duct according to claim 6 or 7, wherein the surface of the water absorbing member has a plurality of slits arranged at predetermined intervals in the axial direction of the communication path. The intake duct according to any one of claims 1 to 8 , wherein the water absorbing member is made of a nonwoven fabric. The intake duct according to claim 9, wherein a plurality of slits formed by needle punching are formed on the surface of the water absorbing member. The intake duct according to any one of claims 1 to 10 , wherein the water absorbing member is disposed in the communication path such that the surface of the water absorption member extends in parallel with the axial direction of the communication path.

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