JP2007331743A - Air-blowing duct for defroster - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air-blowing duct for a defroster in which a blow-out stream from a blowing port can cover a wide range and a far range and a uniform blow-out distribution is obtained. <P>SOLUTION: A duct body 16 in which an air-blowing passage 15 for leading conditioned air introduced from an introduction port 13 to the blowing port 14 is formed inside and the conditioned air is blown out from the blowing port 14 toward a windshield is provided. When an inner surface of the duct body 16 forming the air-blowing passage, i.e., a surface along which a main stream of the conditioned air flows is supposed to be a first surface 16a and the opposed surface is supposed to be a second surface 16b, a wind direction change rib part 17 projected from the first surface 16a toward the second surface 16b and not reaching the second surface 16b is provided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a blow duct for a defroster that guides conditioned air blown toward a windshield.

  As this type of conventional blow duct for a defroster, there is one disclosed in Patent Document 1. As shown in FIG. 9, the defroster blower duct 100 has a duct main body 101 in which an air inlet 101 a having an inlet 101 a at one end and an air outlet 101 b at the other end is formed inside, and an air flow of the duct main body 101. A pair of left and right wind direction changing rib portions 102, 102 branching off the path 101 c are provided. An air conditioning unit 103 is connected to the introduction port 101 a, and conditioned air at a desired temperature is introduced from the air conditioning unit 103. The air outlet 101b is opened on an instrument panel (not shown) at the lower end of the windshield (not shown).

  The pair of left and right wind direction changing rib portions 102, 102 have a linear shape, and are arranged to be inclined so as to gradually widen the mutual space. Each wind direction changing rib portion 102 completely partitions the air passage 101c into three.

According to this conventional example, the conditioned air introduced from the introduction port 101a guides the wind direction changing ribs 102 and 102 so as to advance while spreading the conditioned air in a fan shape as a whole. Can be wide range.
JP-A-10-236153

  However, in the conventional defroster air duct 100, since the wind direction changing ribs 102 and 102 completely partition the air passage 101c, there is a possibility that a windless area is generated around the wind direction changing ribs 102 and 102. As the wind speed decreases. Therefore, although the blowout distribution is wide, the range far from the blowout port 101b cannot be covered.

  Further, since all the air-conditioning winds have the same wind direction, a so-called trough of the blown air flow occurs in the downstream of the wind direction changing ribs 102 and 102. Therefore, although the balloon distribution is wide, there is a partial unevenness.

  Accordingly, an object of the present invention is to provide a blow duct for a defroster which can cover a wide range and a far range of a blowout flow from the blowout port and obtain a uniform blowout distribution.

  The invention of claim 1 which achieves the above object is provided with a duct main body that has an air passage that guides the conditioned air introduced from the inlet to the outlet, and has a duct body that blows the conditioned air toward the windshield from the outlet. The inner surface of the duct body that forms the air passage and the surface along which the main flow of conditioned air flows flows as the first surface, and the inner surface of the duct body and the surface that faces the first surface is the second surface. As a surface, a wind direction changing rib portion that protrudes from the first surface toward the second surface and does not reach the second surface is provided.

  Invention of Claim 2 is the air duct for defrosters of Claim 1, Comprising: The said wind direction change rib part is a linear rib part extended along the direction of the mainstream of the introduce | transduced conditioned air, and this linear rib part It is characterized by comprising a curved rib portion that is continuous with the downstream end and is gradually bent in a desired direction with respect to the direction of the main flow of the conditioned air.

  Invention of Claim 3 is the air duct for defrosters of Claim 1 or Claim 2, Comprising: As for the downstream end part of the said wind direction change rib part, height decreases smoothly as it goes downstream, The most downstream. It is formed so that the height of the end becomes zero.

  A fourth aspect of the present invention is the defroster air duct according to any one of the first to third aspects, wherein the inlet is formed narrow in the vehicle width direction, and the outlet is in the vehicle width direction. The inlet is formed wide in the longitudinal direction of the vehicle, the outlet is narrowly formed in the longitudinal direction of the vehicle, and the sectional area of the inlet and the sectional area of the outlet are set to be substantially the same. It is characterized by that.

  According to the first aspect of the present invention, the main flow of the conditioned air introduced into the air flow path advances in the vicinity of the first surface, so that the wind direction change flow proceeds while changing the wind direction by the wind direction change rib portion, and the air flow other than the main flow is Since the air flows in the vicinity of the second surface, the wind direction change rib portion does not change the wind direction and the crossing flow of the ribs does not occur. Therefore, no windless area is generated around the wind direction change rib portion, and as a result, the wind speed is not reduced. move on. In addition, since airflows having different traveling directions, that is, a wind direction change flow and a rib crossing flow, are blown out from the blowout port, no wind region, that is, a so-called blown airflow valley is not generated in the wake of the wind direction change rib portion. As described above, the blowout flow from the blowout port can cover a wide range and a far range, and a uniform blowout distribution can be obtained.

  Furthermore, since the wind direction changing rib portion does not completely partition the air passage, the air blowing resistance by the wind direction changing rib portion is also reduced, so that it is possible to prevent a decrease in wind speed from this point.

  According to the second aspect of the present invention, in addition to the effect of the first aspect of the invention, the main flow of the conditioned air advances while being guided by the straight rib portion, and then the air direction is smoothly changed by the curved rib portion. Noise caused by separation of air-conditioning wind that occurs when the wind direction is suddenly changed.

  According to the invention of claim 3, in addition to the effect of the invention of claim 1 or claim 2, no wind cracking occurs downstream of the wind direction changing rib portion, so that it is possible to reliably prevent the blown wind from forming a no-air region. .

  According to the invention of claim 4, in addition to the effects of the inventions of claims 1 to 3, it is possible to prevent the situation where the flow velocity of the conditioned air is decelerated in the air passage as much as possible. Can maintain speed. Accordingly, it is possible to prevent a situation in which the cloudy and sunny range of the windshield becomes narrow and the cloudy and sunny speed becomes slow.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 7 show an embodiment of the present invention, FIG. 1 is a schematic view of a vehicle, FIG. 2 is a view of an instrument panel viewed from a driver, and FIG. 3 is a front view of a blow duct for a defroster and a windshield. 4 is an AA cross-sectional view of FIG. 3, FIG. 5 is an enlarged view of a wind direction changing rib portion, FIG. 6 is an enlarged view of a B portion of FIG. 4, and FIG. .

  As shown in FIG. 1, the vehicle 1 is covered with a windshield 2 in front of the passenger compartment. An instrument panel 3 is arranged on the vehicle compartment side at the lower end of the windshield 2. An air conditioning unit 4 is installed at a position below the instrument panel 3. The air conditioning unit 4 creates conditioned air at a desired temperature, and the created conditioned air is blown into the vehicle interior via various ducts such as the defroster air duct 10.

  As shown in FIG. 2, the defroster air duct 10 includes a front duct portion 11 and a side duct portion 12. The front duct portion 11 clears the windshield 2 and the side duct portion 12 causes the side glass side. Do cloudy sunny days. Hereinafter, the configuration of the front duct portion 11 will be described.

  As shown in FIG. 3, the front duct portion 11 is composed of a pair of left and right branch duct portions 11a and 11b depending on other vehicle-mounted component installation space. Each of the branch duct portions 11a and 11b is provided in a duct body 16 in which an air inlet 15 having an introduction port 13 at one end and an air outlet 14 at the other end is formed, and an air passage 15 of the duct body 16. And a plurality of wind direction changing rib portions 17.

  An air conditioning unit 4 is connected to the introduction port 13, and conditioned air at a desired temperature is introduced from the air conditioning unit 4. The blower outlet 14 is opened on the instrument panel 3 (shown in FIGS. 1 and 2) at the lower end of the windshield 2.

  Further, due to other vehicle-mounted component installation space, the inlet 13 is formed with a narrow dimension D1 (shown in FIG. 3) in the vehicle width direction, and the outlet 14 is formed with a wide dimension D2 (shown in FIG. 3) in the vehicle width direction. Formed). On the other hand, the inlet 13 is formed in a dimension D3 (shown in FIG. 4) that is wide in the vehicle longitudinal direction, and the outlet 14 is formed in a dimension D4 (shown in FIG. 4) that is narrow in the vehicle longitudinal direction. As described above, the cross-sectional area of the inlet 13 and the cross-sectional area of the outlet 14 are set to be substantially the same.

  The wind direction changing rib portions 17 are arranged at two locations in each air passage 15. As shown in FIG. 4, each wind direction changing rib portion 17 is an inner surface of the duct body 16 that forms the air passage 15 and a surface along which the main flow of the conditioned air a flows is a first surface 16 a, and the duct body 16. If the surface facing the first surface 16a is the second surface 16b, it is set so as to protrude from the first surface 16a toward the second surface 16b and not reach the second surface 16b. Yes. The height h of the wind direction changing rib portion 17 is set to a height of 1/3 · H to 2/3 · H, where H is the height of the air passage 15.

  As shown in FIG. 5, the wind direction changing rib portion 17 is continuous to the linear rib portion 17 a extending along the main flow direction of the conditioned air a introduced from the introduction port 13, and the downstream end of the linear rib portion 17 a. And it is comprised from the curved rib part 17b bent gradually in the desired direction with respect to the direction of the mainstream of the conditioned air a.

  As shown in FIG. 6, the downstream end portion of the wind direction changing rib portion 17 is formed such that the height smoothly decreases toward the downstream side, and the height of the most downstream end becomes zero. That is, when it is formed as shown by the broken line in FIG. 7, a step is formed at the position of the most downstream end, but the step is not formed.

  In the above configuration, the conditioned air a introduced from the introduction port 13 guides the air direction changing ribs 17 to advance while spreading the conditioned air a as a whole. Become.

  Here, the flow of the conditioned air a in the air passage 15 will be described in more detail. As shown in FIGS. 4 and 7, the main flow of the air conditioned air a introduced into the air passage 15 is in the vicinity of the first surface 16a. The air direction change flow b that advances while changing the air direction by the air direction change rib portion 17 is advanced, and the conditioned air a other than the mainstream advances without changing the air direction by the air direction change rib portion 17 because it travels in the vicinity of the second surface 16b. Since the rib cross-flow c is generated, no windless area is generated around the wind direction changing rib portion 17, and as a result, the wind speed is not lowered. In addition, since the airflows having different traveling directions, that is, the wind direction changing flow b and the rib crossing flow c, are blown out from the air outlet 14, no wind region, that is, a so-called blown airflow valley is generated downstream of the wind direction changing rib portion 17. As described above, the blowout air from the outlet 14 can cover a wide range and a far range, and a uniform blowout distribution can be obtained. In FIG. 3, the constant wind speed region of the blown wind is indicated by a broken line, and the broken line at the uppermost position is the effective wind speed value reaching region.

  Furthermore, since the wind direction changing rib portion 17 does not completely partition the air blowing path 15, the air blowing resistance by the wind direction changing rib portion 17 is also reduced, so that it is possible to prevent a decrease in wind speed from this point.

  In this embodiment, the wind direction changing rib portion 17 is continuous with the straight rib portion 17a extending along the main flow direction of the conditioned air a and the downstream end of the straight rib portion 17a, and the main flow direction of the conditioned air a. Therefore, the main flow of the conditioned air a proceeds while being guided by the straight rib portion 17a, and thereafter the wind direction smoothly flows by the curved rib portion 17b. Therefore, no noise is generated due to separation of the conditioned air that occurs when the direction of the conditioned air is suddenly changed.

  In this embodiment, the downstream end portion of the wind direction changing rib portion 17 is formed such that the height smoothly decreases toward the downstream and the height of the most downstream end becomes zero. Since no wind cracks are generated downstream, it is possible to reliably prevent the blowing wind from forming a non-wind region (so-called trough of blowing air).

  In this embodiment, the introduction port 13 is formed narrow in the vehicle width direction, the air outlet 14 is formed wide in the vehicle width direction, the introduction port 13 is formed wide in the vehicle front-rear direction, and the air outlet 14 is formed in the vehicle front-rear direction. Since the cross-sectional area of the inlet 13 and the cross-sectional area of the outlet 14 are set to be substantially the same, it is possible to prevent a situation where the flow velocity of the conditioned air is decelerated in the air passage 15 as much as possible. The wind blowing speed can be maintained at a predetermined speed. Therefore, it contributes to prevention of a situation where the cloudy and sunny range of the windshield 2 is narrowed and the cloudy and sunny speed is slow.

  FIG. 8 is a front view of a blow duct for a defroster and a windshield according to another embodiment. Although the front duct portion 11 of the above embodiment is a vertically long type, the front duct 11A of FIG. 8 is different in that it is a horizontally long type. Due to such a difference, the wind direction changing rib portion 17A is set so as to change the direction of the conditioned air in a direction to suppress the spread of the conditioned air. Since other configurations are the same as those in the above embodiment, the description thereof is omitted. In other embodiments as well, the same operations and effects as in the above-described embodiment can be obtained.

  In addition, although the wind direction change ribs 17 and 17A of 1st and 2nd embodiment are comprised from the linear rib part 17a and the curved rib part 17b, the location which does not need to change a wind direction, or changes a wind direction largely. It may be composed of only a straight line portion at an unnecessary portion.

1 is a schematic view of a vehicle according to an embodiment of the present invention. It is the figure which showed one Embodiment of this invention and looked at the instrument panel side from the driver. 1 is a front view of a blow duct for a defroster and a windshield, showing an embodiment of the present invention. FIG. 4 shows an embodiment of the present invention and is a cross-sectional view taken along the line AA in FIG. 3. 1 is an enlarged view of a wind direction changing rib portion according to an embodiment of the present invention. FIG. 5 shows an embodiment of the present invention and is an enlarged view of part B of FIG. 4. It is a figure which shows one Embodiment of this invention and shows a wind direction change flow and a rib crossing flow. FIG. 5 is a front view of a defroster air duct and a windshield according to another embodiment of the present invention. It is a perspective view of the ventilation duct for defrosters of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 ... Windshield 10 ... Defroster blower duct 13 ... Inlet 14 ... Outlet 15 ... Air blower 16 ... Duct body 16a ... 1st surface 16b ... First Two surfaces 17, 17A ... wind direction changing rib portion 17a ... straight rib portion 17b ... curved rib portion

Claims (4)

A duct body (15) for guiding the conditioned air introduced from the inlet (13) to the outlet (14) is formed therein, and the duct body blows out the conditioned air from the outlet (14) toward the windshield (2). (16) is provided,
The inner surface of the duct body (16) forming the air passage (15) and the surface along which the main flow of conditioned air flows flows as the first surface (16a), the inner surface of the duct body (16), and When the surface facing the first surface (16a) is the second surface (16b),
A wind direction changing rib portion (17, 17A) that protrudes from the first surface (16a) toward the second surface (16b) and does not reach the second surface (16b) is provided. A blow duct (10) for the defroster. A blow duct (10) for a defroster according to claim 1,
The wind direction changing rib portion (17, 17A) includes a straight rib portion (17a) extending along a main flow direction of the introduced conditioned air,
It is characterized by comprising a curved rib portion (17b) which is continuous with the downstream end of the straight rib portion (17a) and is gradually bent in a desired direction with respect to the main flow direction of the conditioned air. An air duct (10) for the defroster. A blow duct (10) for a defroster according to claim 1 or 2,
The downstream end portion of the wind direction changing rib portion (17, 17A) is formed such that the height smoothly decreases toward the downstream side and the height of the most downstream end becomes zero. Duct (10). A blow duct (10) for a defroster according to any one of claims 1 to 3,
The introduction port (13) is formed narrow in the vehicle width direction, the outlet (14) is formed wide in the vehicle width direction, and the introduction port (13) is formed wide in the vehicle front-rear direction, The blower outlet (14) is formed narrow in the vehicle front-rear direction, and the cross-sectional area of the inlet (13) and the cross-sectional area of the blower outlet (14) are set to be substantially the same. (10).

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