Vent duct

Abstract

To provide a vent duct capable of reducing noise without blocking a flow of air discharged from an in-cabin space to an outside space.SOLUTION: A vent duct 1 includes a connection space 4 discharging air in an in-cabin space S1 of a vehicle to an outside space S2 of the vehicle, a peripheral wall 2 enclosing the connection space, a first guide member 6 extending from a first side of the peripheral wall toward the in-cabin space and a second guide member 8 extending from a second side opposed to the first side toward the in-cabin space. A sound wave N3, traveling nearby the peripheral wall on the side of the second side, of noise is propagated from the outside space toward the in-cabin space through a first connection space 41, and travels in a second direction V toward a first curved part 61 along a wall part 82 after colliding against a second curved part 81 of the second guide member to turn to collide against a sound wave N4 traveling in the connection space in a first direction H. The sound wave N3 is propagated in a path which is longer than that of the sound wave N4 at least by the size of the second curved part, so that sounds in frequency ranges having a path difference of a 1 / 2 wavelength become opposite in phase to cancel each other.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present disclosure relates to a vent duct.

Background Art

[0002] Conventionally, a vent duct that curves a part of a sound wave to cancel out the input sound and reduce noise is known (see, for example, Patent Document 1).

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The vent duct of Patent Document 1 discloses a structure including a plurality of guide members provided on the indoor space side of a vehicle. The guide members in this vent duct curve a part of the sound wave input from the external space of the vehicle. As a result, the curved sound wave can cancel out the input sound wave. Therefore, the vent duct can reduce the noise transmitted from the external space of the vehicle to the indoor space.

[0005] On the other hand, in the vent duct of Patent Document 1, a plurality of guide members extending to the indoor space side curve and extend. This guide member extends in a direction intersecting the flow of air discharged from the indoor space to the external space through the vent duct. Therefore, the vent duct may inhibit the flow of air discharged from the indoor space to the external space through the vent duct. Furthermore, a part of the guide member opens to the indoor space side along the direction in which the vent duct extends. Therefore, a part of the noise that has passed through the vent duct may propagate directly to the indoor space.

[0006] An object of the present disclosure is to provide a vent duct that can reduce the noise in the indoor space without inhibiting the flow of air discharged from the indoor space to the external space.

Means for Solving the Problems

[0007] A vent duct according to one aspect of the present disclosure comprises a connecting space that discharges air from the interior space of a vehicle to the exterior space of the vehicle and connects the interior space and the exterior space; a peripheral wall surrounding the connecting space; a first guide member extending toward the interior space from a first side which is one side of the peripheral wall; and a second guide member extending toward the interior space from a second side which is one side of the peripheral wall and opposite to the first side. The first guide member has a first curved portion that curves toward the second side and extends to a position that overlaps with the connecting space when viewed from the interior space side toward the exterior space. The second guide member has a second curved portion that curves toward the first side and extends to a position that overlaps with the connecting space when viewed from the interior space side toward the exterior space. The first curved portion is positioned closer to the external space than the second curved portion, and the second guide member extends to a position where it overlaps with the first curved portion when viewed from the interior space towards the external space.

[0008] In this vent duct, the first curved portion of the first guide member bends sound waves propagated from the external space. As a result, the first guide member cancels out a portion of the sound waves that pass through the connection space. Similarly, the second curved portion of the second guide member also bends sound waves propagated from the external space. As a result, the second guide member cancels out a portion of the sound waves that pass through the connection space. Consequently, the vent duct can reduce noise transmitted from the external space to the indoor space.

[0009] On the other hand, air discharged from the indoor space to the outdoor space flows through the space between the second guide member and the first guide member into the connecting space. As a result, the vent duct can quickly guide this air to the outdoor space without obstructing the airflow path from the indoor space to the outdoor space. Consequently, the vent duct can reduce noise with a simple structure without obstructing the airflow discharged from the indoor space to the outdoor space. [Effects of the Invention]

[0010] According to this disclosure, it is possible to provide a vent duct that can reduce noise without obstructing the airflow from the indoor space to the outdoor space. [Brief explanation of the drawing]

[0011] [Figure 1] A perspective view showing a vehicle in an embodiment of this disclosure. [Figure 2] A perspective view showing a vent duct in an embodiment of the present disclosure. [Figure 3] A cross-sectional view showing cross-section AA of the vent duct in an embodiment of the present disclosure. [Figure 4] A perspective view showing a vent duct in an embodiment of the present disclosure. [Figure 5] A schematic diagram illustrating the sound-dampening mechanism in the embodiment of this disclosure. [Modes for carrying out the invention]

[0012] Hereinafter, an embodiment of the present disclosure will be described with reference to the figures. As shown in Figures 1 to 4, in this embodiment, a vent duct provided on the body of a vehicle C will be described as an example. The vent duct 1 of this embodiment is located on the right side of the vehicle C and on the outer panel behind the rear wheel house. Furthermore, the vent duct 1 opens toward the space between the outer panel and the resin rear bumper covering the rear of the vehicle C on the external space S2 side. For this reason, in the following specification, the first direction H of the vent duct 1 from the outside toward the inside coincides with the vehicle width direction. Furthermore, the second direction V, which is the height direction of the vent duct 1, coincides with the vertical direction of the vehicle C, and the third direction W, which is the width direction of the vent duct 1, coincides with the front-rear direction of the vehicle C.

[0013] However, the vent duct 1 is not limited to this location and may be positioned on the left side or rear of the vehicle C. Furthermore, the vent duct 1 may be positioned with its second direction V inclined relative to the vertical direction of the vehicle C. Therefore, the first direction H to the third direction W do not necessarily coincide with the longitudinal direction, vertical direction, and longitudinal direction of the vehicle C.

[0014] The vent duct 1 is a component that connects the interior space S1 and the exterior space S2 of vehicle C and has the function of discharging the air from the interior space S1 of vehicle C to the exterior space S2 of vehicle C. The vent duct 1 discharges the air from the interior space S1 to the exterior space S2, for example, when the doors of vehicle C are closed.

[0015] The vent duct 1 comprises a peripheral wall 2, a connecting space 4, a first guide member 6, a second guide member 8, and a partition wall 10.

[0016] The peripheral wall 2 is a resin member that surrounds the connection space 4, which will be described later. The peripheral wall 2 has an outer frame portion 21, a first side 22, a second side 23, a plurality of fins 24, and a plurality of flaps 25. In this embodiment, the peripheral wall 2 is a cylindrical member with a roughly rectangular cross-section that connects the interior space S1 and the exterior space S2 when the vent duct 1 is assembled to the vehicle C. However, the peripheral wall 2 is not limited to this and may be formed into various shapes as long as it can be fixed to the opening of the vehicle C.

[0017] The outer frame portion 21 is a cylindrical member extending along the first direction H. The outer frame portion 21 is formed in a substantially rectangular parallelepiped shape with a roughly constant passage area. In this embodiment, the outer frame portion 21 is formed to have a passage area with a side length of approximately 150 mm to 200 mm and a length along the first direction H of approximately 100 mm to 200 mm. Furthermore, the passage area of ​​the outer frame portion 21 may be formed to have a side length of approximately 100 mm to 250 mm. Also, the length of the outer frame portion 21 along the first direction H may be formed to have a size of approximately 100 mm to 250 mm. In this embodiment, the outer frame portion 21 is formed of a hard resin of a predetermined thickness.

[0018] The outer frame portion 21 includes a first opening 211 and a second opening 212. The first opening 211 opens toward the interior space S1 side of the outer frame portion 21. The second opening 212 opens toward the exterior space S2 side. In this embodiment, the first opening 211 and the second opening 212 have approximately the same area as the cross-sectional area of ​​the outer frame portion 21.

[0019] The first side 22 is one side of the end of the peripheral wall 2 on the indoor space S1 side. In the present embodiment, the first side 22 is the lower edge of the first opening 211 of the outer frame portion 21.

[0020] The second side 23 is one side of the end of the peripheral wall 2 on the indoor space S1 side and is the side facing the first side 22. In the present embodiment, the second side 23 is the upper edge of the first opening 211 of the outer frame portion 21. That is, the first side 22 and the second side 23 are the edge portions of the peripheral wall 2 that extend along the third direction W and are substantially parallel to each other.

[0021] The fin 幃 is a plate-like member provided inside the outer frame portion 21. The fin 24 extends from the inner peripheral surface of the outer frame portion 21 along the first direction H and the third direction W. Also, the length of the fin 24 along the first direction H is smaller than the length of the outer frame portion 21. In the fin 24 of the present embodiment, the length along the first direction H is about 10 mm to 20 mm. Also, the length of the fin 24 along the first direction H may be about 5 mm to 30 mm.

[0022] Thereby, the fin 24 can suppress the deformation of the outer frame portion 21 without hindering the flow of the gas inside the vent duct 1. The fin 24 of the present embodiment includes a first fin 241, a second fin 242, a third fin 243, and a fourth fin 244. The first fin 241 to the fourth fin 244 are arranged at equal intervals along the second direction V. Not limited to this, the shape and number of the fins 24 can be variously changed.

[0023] The flap 25 is a sheet member made of rubber or resin. The flap 25 is attached to the inner peripheral surface of the outer frame portion 21 or the fin 24 via a shaft extending along the third direction W. The flap 25 is rotatable about the shaft and opens and closes between the outer frame portion 21 and the fin 24 and between adjacent fins 24 according to the flow of the air inside the connection space 4 described later.

[0024] The flap 25 of the present embodiment includes a first flap 251, a second flap 252, a third flap 253, a fourth flap 254, and a fifth flap 255.

[0025] The first flap 251 is positioned between the inner circumferential surface of the outer frame 21 and the first fin 241. The second flap 252 is positioned between the first fin 241 and the second fin 242. Similarly, the third flap 253 is positioned between the second fin 242 and the third fin 243, and the fourth flap 254 is positioned between the third fin 243 and the fourth fin 244. The fifth flap 255 is positioned between the fourth fin 244 and the inner circumferential surface of the outer frame 21.

[0026] For example, when the door of vehicle C is closed and the air in the interior space S1 is discharged to the exterior space S2 via the vent duct 1, the flap 25 opens. This allows the vent duct 1 to quickly discharge the air in the interior space S1 to the exterior space S2.

[0027] Furthermore, the flap 25 remains closed except when air is being discharged. The vent duct 1 can prevent water droplets, pebbles, etc. from entering the indoor space S1 from the external space S2. In addition, the flap 25 can reduce noise transmitted from the external space S2 to the indoor space S1.

[0028] The connecting space 4 is a hollow space surrounded by the surrounding wall 2. The connecting space 4 is the space that connects the interior space S1 and the exterior space S2. When the doors of vehicle C are closed, the air in the interior space S1 is discharged to the exterior space S2 through the connecting space 4. In addition, noise from outside vehicle C is propagated from the exterior space S2 to the interior space S1 side through the connecting space 4.

[0029] The connection space 4 includes a first connection space 41, a second connection space 42, a third connection space 43, a fourth connection space 44, a fifth connection space 45, and a sixth connection space 46.

[0030] The first connection space 41 is surrounded by a part of the inner circumferential surface of the outer frame 21 and the first fin 241. The second connection space 42 is surrounded by a part of the inner circumferential surface of the outer frame 21, the first fin 241 and the second fin 242. Similarly, the third connection space 43 is surrounded by a part of the inner circumferential surface of the outer frame 21, the second fin 242 and the third fin 243, and the fourth connection space 44 is surrounded by a part of the inner circumferential surface of the outer frame 21, the third fin 243 and the fourth fin 244. The fifth connection space 45 is surrounded by the fourth fin 244 and a part of the inner circumferential surface of the outer frame 21. The sixth connection space 46 is located closer to the interior space S1 than the first connection space 41 and the fifth connection space 45, and is surrounded by the inner circumferential surface of the outer frame 21.

[0031] The first guide member 6 is a plate-shaped member that extends from the first side 22 of the peripheral wall 2 and is positioned on the side of the interior space S1. In this embodiment, the first guide member 6 is provided continuously with the peripheral wall 2 and is formed to extend from the first opening 211 towards the interior space S1.

[0032] The first guide member 6 has a first curved portion 61. The first curved portion 61 curves toward the second side 23 with a first radius of curvature R1. That is, the first curved portion 61 curves toward the inside of the first opening 211. In this embodiment, the first curved portion 61 is an arc shape that curves so that the first radius of curvature R1 is approximately 20 mm. Furthermore, the first radius of curvature R1 of the first curved portion 61 may be in the size of approximately 10 mm to 30 mm.

[0033] Furthermore, the first curved portion 61 extends to a position where it overlaps with the connecting space 4 when viewed in the inward-outward direction H1, which is the direction from the indoor space S1 to the outdoor space S2. That is, the first curved portion 61 has an arc shape with a central angle of about 90 degrees, and its end extends along the second direction V. In this embodiment, the first curved portion 61 extends to a position where it covers about one-fifth of the first opening 211 when viewed in the inward-outward direction H1.

[0034] Furthermore, the first curved portion 61 curves upward from the lower end of the first opening 211 of the outer frame portion 21. As a result, the first curved portion 61 can prevent liquids such as rainwater that have entered the connecting space 4 from the external space S2 from flowing into the indoor space S1.

[0035] The second guide member 8 is a plate-shaped member that extends from the second side 23 of the peripheral wall 2 and is positioned on the side of the interior space S1. In this embodiment, the second guide member 8 is provided continuously with the peripheral wall 2 and is formed to extend from the first opening 211 towards the interior space S1.

[0036] The second guide member 8 has a second curved portion 81, a wall portion 82, and a third curved portion 83.

[0037] The second curved section 81 curves toward the first side 22 with a second radius of curvature R2. That is, the second curved section 81 extends from the first opening 211 of the outer frame section 21 and curves toward the center of the first opening 211. The second radius of curvature R2 of the second curved section 81 is larger than the first radius of curvature R1 and is approximately the same size as the third radius of curvature R3, which will be described later.

[0038] In this embodiment, the second radius of curvature R2 is approximately twice the size of the first radius of curvature R1. Specifically, it is an arc shape that curves so that the second radius of curvature R2 is approximately 40 mm. Furthermore, the second radius of curvature R2 of the second curved portion 81 may be approximately 20 mm to 50 mm in size.

[0039] Furthermore, the second curved portion 81 extends to a position that overlaps with the connection space 4 when viewed in the inward-outward direction H1. In this embodiment, the second curved portion 81 extends from the upper edge of the first opening 211, curves along the first direction H and the second direction V, and connects to the wall portion 82, which will be described later.

[0040] The wall portion 82 is a plate-shaped member that extends continuously from the end of the second curved portion 81 along the second direction V. The wall portion 82 is positioned opposite the first opening 211 at a distance equal to the length of the second curved portion 81 in the first direction H. In this embodiment, the wall portion 82 is positioned at a distance of approximately 30 mm from the first opening 211 in the first direction H. Furthermore, the distance between the wall portion 82 and the first opening 211 may be approximately 20 mm to 50 mm.

[0041] The wall portion 82 extends in the second direction V to the vicinity of the first side 22 of the peripheral wall 2 and connects to the third curved portion 83, which will be described later.

[0042] Furthermore, the wall portion 82 is formed to be approximately the same size as the first opening 211 when viewed in the inward-outward direction H1. In this embodiment, the wall portion 82 is formed to cover the first opening 211 when viewed in the inward-outward direction H1.

[0043] The third curved section 83 extends continuously from the end of the wall section 82 and curves toward the interior space S1 with a third radius of curvature R3. That is, the third curved section 83 curves toward the connecting space 4 with a third radius of curvature R3. The third radius of curvature R3 of the third curved section 83 is approximately the same size as the first radius of curvature R1 and smaller than the second radius of curvature R2.

[0044] The third curved portion 83 in this embodiment has an arc shape that curves so that the third radius of curvature R3 is approximately 20 mm. Furthermore, the third radius of curvature R3 of the third curved portion 83 may be in the range of 10 mm to 30 mm.

[0045] As a result, the third curved section 83 can increase the area over which air can circulate between the first opening 211 and the indoor space S1. Furthermore, the third curved section 83 can quickly guide the air from the indoor space S1 to the vicinity of the wall section 82 and the second curved section 81. Therefore, the air from the indoor space S1 can pass through the first opening 211 and proceed to the connecting space 4 without its flow being obstructed near the first guide member 6. As a result, the vent duct 1 can quickly discharge the air from the indoor space S1 to the external space S2 via the connecting space 4.

[0046] As described above, the vent duct 1 is provided such that, when viewed in the inward-outward direction H1, the first guide member 6 extending from the first side 22 of the peripheral wall 2 and the second guide member 8 extending from the second side 23 of the peripheral wall 2 overlap. In this embodiment, in the first direction H, the second guide member 8 is positioned closer to the indoor space S1 than the first guide member 6. Furthermore, the first curved portion 61 of the first guide member 6 is positioned closer to the external space S2 than the second curved portion 81 of the second guide member 8.

[0047] Furthermore, the first radius of curvature R1 of the first curved section 61 is smaller than the second radius of curvature R2 of the second curved section 81. In addition, the third radius of curvature R3 of the third curved section 83 is approximately equal to the first radius of curvature R1 of the first curved section 61.

[0048] The partition wall 10 is a plate-shaped member extending along the first direction H. The partition wall 10 closes the space between the first opening 211 and the first curved portion 61, the wall portion 82, and the third curved portion 83 of the second guide member 8. In this embodiment, the partition wall 10 is positioned on the front side of the vehicle C and closes the space between the circumferential wall 2 and the second guide member 8.

[0049] As a result, the bulkhead 10 is positioned between the interior space S1 and the connecting space 4 of the vehicle C. Therefore, the bulkhead 10 can reduce noise transmitted from the external space S2 to the interior space S1 side, particularly the forward side, via the vent duct 1.

[0050] As described above, the vent duct 1 has a first outlet E1 and a second outlet E2 opening toward the indoor space S1. The first outlet E1 opens between the first guide member 6 and the second guide member 8 along the second direction V. The second outlet E2 opens between the peripheral wall 2 and the second guide member 8 along the third direction W.

[0051] In this embodiment, the vent duct 1 is formed such that the sum of the areas of the first outlet E1 and the second outlet E2 is approximately the same as the area of ​​the first opening 211 of the peripheral wall 2. This allows the air from the indoor space S1, which is discharged toward the external space S2, to flow quickly into the connecting space 4 without being stagnated by the first guide member 6, the second guide member 8, and the partition wall 10.

[0052] Next, the noise reduction mechanism of the vent duct 1 in this embodiment will be explained using Figure 5.

[0053] Noise from the external space S2 is transmitted to the indoor space S1 through the connection space 4 of the vent duct 1. At this time, the noise propagates as vibration from the connection space 4 along the first direction H.

[0054] First, we will explain the sound wave dampening that propagates along the first direction H on the side of the first guide member 6 in the connection space 4. In this embodiment, noise propagates from the external space S2 towards the indoor space S1 via one of the first connection space 41 to the fifth connection space 45.

[0055] Of the noise, sound waves N1 that travel particularly near the peripheral wall 2 on the first side 22 propagate from the external space S2 towards the indoor space S1 via the fifth connecting space 45. After traveling through the fifth connecting space 45 and passing through the first opening 211, sound waves N1 collide with the first curved portion 61 of the first guide member 6 and bend. At this time, sound waves N1 bend along the first curved portion 61 from the first direction H to the second direction V.

[0056] The sound wave N1, curved by the first curved section 61, travels along the second direction V toward the second curved section 81 and collides with the sound wave N2 that traveled along the first direction H through the connection space 4.

[0057] In this case, the sound wave N1, curved by the first curved section 61, propagates along a path at least equal to the size of the first curved section 61, compared to the sound wave N2. Therefore, among the sounds contained in sound waves N1 and N2, the sounds in the frequency range where the path difference due to the first curved section 61 corresponds to half a wavelength become sounds with opposite phases and cancel each other out. As a result, a portion of the noise is particularly reduced near the area between the end of the first curved section 61 and the first opening 211. Therefore, the first guide member 6 can reduce the noise transmitted from the external space S2 to the indoor space S1.

[0058] Next, we will explain the sound wave cancellation that propagates along the first direction H on the side of the second guide member 8 in the connection space 4.

[0059] Of the noise, the sound waves N3 that travel particularly near the peripheral wall 2 on the second side 23 propagate from the external space S2 through the first connecting space 41 towards the indoor space S1. After passing through the first opening 211, the sound waves N3 collide with the second curved portion 81 of the second guide member 8, bend, and then travel along the wall portion 82. At this time, the sound waves N3 bend along the second curved portion 81 and the wall portion 82 from the first direction H to the second direction V.

[0060] The sound wave N3, curved by the second curved section 81, travels along the second direction V toward the first curved section 61 and collides with the sound wave N4 that travels along the first direction H through the connection space 4.

[0061] At this time, the sound wave N3, which is curved by the second curved section 81, propagates along a path that is at least as long as the second curved section 81 compared to the sound wave N4. As a result, among the sounds contained in sound waves N3 and N4, the sounds in the frequency range where the path difference due to the second curved section 81 corresponds to half a wavelength become sounds with opposite phases and cancel each other out. As a result, a portion of the noise is particularly reduced near the connection point between the second curved section 81 and the wall section 82. Therefore, the second guide member 8 can reduce the noise transmitted from the external space S2 to the indoor space S1.

[0062] As explained above, this disclosure provides a vent duct that can reduce noise without obstructing the airflow from the indoor space to the outdoor space.

[0063] <Other Embodiments> Although embodiments of the present disclosure have been described above, the present disclosure is not limited to the embodiments described above, and various modifications are possible without departing from the spirit of the invention.

[0064] For example, the connection space 4 in the above embodiment had a first connection space 41 to a sixth connection space 46, but the disclosure is not limited thereto. That is, the connection space 4 does not have to be divided by four fins, a first fin 241 to a fourth fin 244. The connection space 4 may be divided by one or more fins, or it may simply be a space surrounded by the inner circumferential surface of the outer frame portion 21.

[0065] For example, in the above embodiment, the first side 22 of the peripheral wall 2 was the lower edge of the first opening 211, but the disclosure is not limited thereto. That is, the first side 22 may be the upper edge of the first opening 211 or the end of the fin 24 on the interior space S1 side.

[0066] Furthermore, although the second side 23 of the peripheral wall 2 in the above embodiment was the upper edge of the first opening 211, the disclosure is not limited thereto. That is, the second side 23 may be the lower edge of the first opening 211 or the end of the fin 24 on the interior space S1 side.

[0067] Furthermore, although the second curved portion 81 and the third curved portion 83 of the second guide member 8 in the above embodiment are curved with approximately the same radius of curvature, this disclosure is not limited thereto. That is, the second radius of curvature R2 of the second curved portion 81 and the third radius of curvature R3 of the third curved portion 83 may be of different magnitudes. [Explanation of Symbols]

[0068] 1: Vent duct 2: Peripheral wall 4: Connection space 6:1st guide member 8:Second guide member 10: Bulkhead 22: First side 23: Second side 61: First curved section 81: Second curved section 82: Wall part 83: Third curve R1: 1st radius of curvature R2: Second radius of curvature R3: Third radius of curvature

Claims

1. A vent duct for discharging air from the interior space of a vehicle to the exterior space of the vehicle, A connecting space that connects the aforementioned indoor space and the aforementioned outdoor space, A peripheral wall surrounding the aforementioned connecting space, A first guide member extending toward the interior space from a first side which is one side of the peripheral wall, A second guide member which is one side of the peripheral wall and extends toward the interior space from a second side opposite to the first side, Equipped with, The first guide member has a first curved portion that curves toward the second side and extends to a position where it overlaps with the connecting space when viewed from the interior space side toward the exterior space, The second guide member has a second curved portion that curves toward the first side and extends to a position where it overlaps with the connecting space when viewed from the interior space side toward the exterior space, The first curved portion is positioned closer to the external space than the second curved portion. The second guide member extends to a position where it overlaps with the first curved portion when viewed from the interior space side toward the exterior space. Vent duct.

2. The first curved portion is curved with a first radius of curvature, The second curved portion is curved with a second radius of curvature, The first radius of curvature is smaller than the second radius of curvature. The vent duct according to claim 1.

3. The second guide member has a wall portion that extends continuously from the second curved portion and faces the connecting space, and a third curved portion that extends from the end of the wall portion opposite to the second curved portion and curves toward the interior space with a third radius of curvature. The vent duct according to claim 1.

4. The device further includes a partition wall connecting the second guide member and the peripheral wall, The aforementioned bulkhead is located on the front side of the vehicle. The vent duct according to claim 3.

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