JP3437752B2 - Air guide structure at the bent part of air duct - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an air duct of an air guide means for guiding air in an air conditioner of an automobile, and more particularly, to a bending of an air duct. TECHNICAL FIELD The present invention relates to an air guide structure of an air duct bent portion for allowing air flowing through a portion to flow smoothly. [0002] For example, in an air conditioner of an automobile, for example, a heater unit having a fan to discharge air and an instrument panel provided at a front end of a vehicle compartment generally have the above-mentioned configuration. An air outlet for allowing air to be blown into the vehicle compartment, and air guide means for guiding the discharge air from the heater unit to the air outlet are provided, and the air guide means connects the heater unit to the air outlet. Has an air duct connected thereto. [0003] In the above case, since the heater unit and the air outlet are disposed at desired positions in relation to other vehicle components and the passenger compartment, the above connection cannot be made by a straight air duct. From this air duct
It has a bent shape with several bends in the middle. By the way, when air flows in the bent portion, the air tends to flow intensively along the inner surface of the bent portion in the bent portion due to its inertia force. There is an inconvenience that peeling is likely to occur and a vortex tends to occur, thereby increasing the pressure loss. Therefore, conventionally, as shown in FIGS. 4 and 5 of Japanese Utility Model Laid-Open Publication No. Sho 61-31913, air which is bent along the hole core of the bent portion in the bent portion of the air duct. A guide is provided, and when the air flowing in the bent portion is going to the inner surface on the valley fold side by its inertia force, by guiding a part of this air by the air guide, along the inner surface on the valley fold side. There has been proposed an arrangement in which air does not flow intensively, thereby suppressing an increase in pressure loss. [0006] However, in the above conventional technique, an air guide is provided separately from the air duct, so that the number of parts is increased and the structure of the air guide means is increased. Is complicated. In addition, since at least a part of the attachment for attaching the air guide projects into the air duct, a wind noise may be generated. Therefore, the air guide means is made of resin,
It is conceivable that the air duct and the air guide are integrally formed. However, since the air guide is provided on both opposing surfaces on the inner surface of the air duct, the air guide is formed by injection of the air guide means or the like. During molding,
The air guide is in the way, making it difficult to remove the mold,
Accordingly, the molding of the air guide means may be complicated. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, to prevent the pressure loss of the air guided by the air guiding means from increasing, and to prevent the generation of wind noise. Even in such a case, it is an object to prevent the configuration of the air guide unit from becoming complicated and to easily form the air guide unit. [0010] To solve the above-mentioned problems, the air guide structure of the bent portion of the air duct of the present invention has a structure in which the air duct 12 is viewed from one direction.
2 is an air guide means 9 having a bent portion 19 between its upstream side portion 17 and its downstream side portion 18. Opposing surfaces 21, 22
Each projected integrally with ribs 23 and 24, when viewed from the one direction, the ribs 23 and 24 is bent along the hole core 26 of the bending portion 19, the [0012] the rib 23, 24 Along its length
Viewed in Tsu gaze, the base width W ₁ is the top width W ₂
And the ribs 23 and 24 are
In the width direction of the air duct 12 with respect to the facing surfaces 21 and 22
It is provided alternately . Embodiments of the present invention will be described below with reference to the drawings. ( Comparative Example with the Present Invention) First, a comparative example with the present invention will be described with reference to FIGS.
With regard to, we described. 1 to 4, reference numeral 1 denotes a vehicle body of an automobile, and an arrow Fr indicates the front of the automobile. The interior of the vehicle body 1 is a vehicle room 2, and an instrument panel 3 extending in the vehicle width direction is provided at a front end of the vehicle room 2 and supported by the vehicle body 1. The vehicle body 1 is equipped with an air conditioner 5. The air conditioner 5 includes a heater unit 6 provided below the instrument panel 3 and having a fan and capable of discharging air A, and a heater unit 6 formed on the instrument panel 3 and provided in the vehicle compartment 2. Air outlets 7 and 8 that allow air A to be blown out, and air guides that are provided inside the instrument panel 3 and guide the discharge air A from the heater unit 6 to the respective air outlets 7 and 8. Means 9 and the air outlet 7,
8, some of the air outlets 7 are located substantially at the center of the vehicle compartment 2 in the vehicle width direction, and the other air outlets 8 are located at respective sides of the vehicle compartment 2 in the vehicle width direction. , And both the air outlets 7 and 8 are opened so as to face the rear end side of the vehicle compartment 2. The air guide means 9 is disposed substantially at the center of the vehicle compartment 2 in the vehicle width direction and is provided with the heater unit 6.
And a main air duct 11 extending upward from the upper end of the main air duct 11 and extending rearward from an upper end portion of the main air duct 11, and an opening at an extending end of the main air duct 11 is opened to the vehicle compartment 2 through the air outlet 7. The air duct 12 and other air extending from the upper end of the main air duct 11 to the left and right outwards, and each opening of its extending end is opened to the vehicle compartment 2 through each air outlet 8. Ducts 13 and 13 are provided. The main air duct 11, the air duct 12, and each of the other air ducts 13 are made of resin, and the inside of each is formed as an air passage 14 and communicated with each other. When the heater unit 6 is driven, air A outside the vehicle and / or in the passenger compartment 2 is sucked into the heater unit 6 and heated, and is discharged from the heater unit 6. Part of the air A ₁ of the air A has been discharged from the heater unit 6 flows toward the air passage 14 of the main air duct 11 upwardly from the air passage 14 of the air duct 12, an air outlet 7 and is blown rearward toward the center of the passenger compartment 2 in the vehicle width direction. The air A ₂ of the other part of the air A as described above passes through the air passage 14 of the respective other air duct 13 and the air outlet 8, toward the vehicle width direction of the side of the vehicle compartment 2 It is blown back. 1 to 5, the air duct 12 will be described in more detail. As shown in the side view of FIG. 4, when the air duct 12 is viewed from the vehicle width direction, the air duct 12
After extending once upward and rearward from the upper end of the main air duct 11, it is bent substantially horizontally rearward. As shown in the plan view of FIG. 1, when the air duct 12 is viewed from a certain vertical direction, the air duct 12 is substantially straight from the upper end of the main air duct 11 to the back once. Upstream part 17 which extends
A downstream portion 18 extending substantially linearly rearward so as to communicate with the air outlet 7, and the upstream portion 1.
It has a bent portion 19 for communicating these with each other from the position 7 to the downstream side portion 18. 1, 4 and 5, the air duct 1
The cross section of the air passage 14 has a rectangular shape that is long in the vehicle width direction. On the inner surface of the bent portion 19 of the air duct 12, there are two opposing surfaces 21 and 22 that oppose each other in the above one direction (vertical direction). , Short ribs 23 each having a height H,
24 are integrally formed. These ribs 23, 24
Extends along the longitudinal direction of the air duct 12 when viewed from the one direction (in a plan view or a bottom view), and more specifically, is bent along the hole core 26 of the bent portion 19. Have been. Each of the ribs 23 and 24 has a plurality of ribs (3) in the width direction of the air duct 12 (vehicle width direction).
The ribs 23 and 24 are arranged at substantially equal intervals (P), and the ribs 23 and 24 are located at substantially the same position in the width direction of the air duct 12. [0026] Then, as described above, because the molded ribs 23, 24 on the respective counter faces 21 and 22 of the bending portion 19, the bent portion air _{A 1} flowing through the air passage 14 of the bending portion 19 is in its inertial force Inner surface 2 on the valley fold side of inner surface 19
When the leaps to 8, this part of the air A ₁ is guided by the respective ribs 23 and 24, said inwardly folded side of the inner surface 2
8 air A ₁ along is prevented from flowing in a concentrated manner. Therefore, the air passage 14 in the bent portion 19
Of each part of the cross-section becomes that the air A ₁ to flow more uniformly, the vortex 30 from the mountain fold side of the inner surface 29 and air A ₁ is peeled off the inner surface of the bending portion 19 that occurs is suppressed, Therefore, an increase in the pressure loss of the air A at the bent portion 19 is suppressed. In FIG. 5, a plurality of air guide grooves 32 extending in the longitudinal direction are provided on each side surface of each of the ribs 23 and 24.
Are formed. [0029] Therefore, the air _{A 1} flowing in the vicinity of each of the opposing surfaces 21 and 22 are guided to the respective air guide grooves 32, so as not to peel from the respective opposing surfaces 21, 22 each of these opposed faces 21 and 22 Near the hole core 26 of the bent portion 19
Along the more reliably air A ₁ to flow, this time, by the viscosity of the air A _1, even flow of air A ₁ flowing a central portion of the air passage 14 inside the bending portion 19, at its inertia force Attempts to face the inner surface 28 on the valley fold side are suppressed. Therefore, the air A ₁ flows more evenly through the air passage 14 in the bent portion 19, and the air A ₁ is separated from the inner surface 29 of the bent portion 19 on the side of the mountain fold, so that the air A ₁ is swirled. 30 is further suppressed that occurs, Therefore, increase in pressure loss of the air a ₁ in the bending portion 19 is further suppressed. In FIG. 3, as described above, the bent portion 1
Since the increase in pressure loss of the air A ₁ is suppressed at 9, air A ₁ blown toward the rear end of the air duct 12 and the air outlet 7 and passes casing 2, the conventional As compared with the case (two-dot chain line in FIG. 3), the air is blown out more vigorously, so that the air reaches the rear end of the cabin 2 sufficiently, and the air conditioning of the cabin 2 is made more uniform. The Rukoto. FIGS. 6 (1) and 6 (2) show the air duct 1 described above.
Shows a flow velocity distribution of the air A ₁ in a front view of the air passage 14 of the second downstream side 18, (1) is conventional and (2) was due to the embodiment of the present application, in each of the drawings The unit of the numerical value is m / sec. [0033] As described above, in the air passage 14 in the bent portion 19, since the air A ₁ is flowing more evenly, the flow velocity distribution of the air A flowing through the air passage 14 of the downstream portion 18 of the air duct 12 The case according to the above embodiment (FIG. 6 (2)) is more uniform than the conventional case (FIG. 6 (1)). More specifically, in the conventional flow velocity distribution shown in FIG. 6A, the high flow velocity part (the part with a matte surface at 8 m / sec or more) is the air in the downstream side part 18 of the air duct 12. In the passage 14, while being deviated to one side (the right side in the drawing) in the vehicle width direction, according to the flow velocity distribution of the present application,
The high flow rate portion is dispersed in each portion of the air passage 14 in the vehicle width direction, and the air A ₁ flowing through the air passage 14 is dispersed.
Are more uniform. As described above, each of the ribs 23, 24
Is integrally formed on each of the facing surfaces 21 and 22,
A part of the fitting for the air guide does not protrude as in the prior art described above, and therefore, it is possible to prevent wind noise from being generated by the air A flowing through the air passage 14 in the bent portion 19. You. Further, as described above, each of the ribs 23, 24
Are integrally formed on the respective opposing surfaces 21 and 22, so that the number of parts of the air guide means 9 is prevented from increasing, and the configuration of the air guide means 9 is simplified. In addition, the ribs 23 and 24 project from the opposing surfaces 21 and 22, and the height H is sufficiently shorter than the distance between the opposing surfaces 21 and 22. The central portion of the air passage 14 in the bent portion 19 of the air duct 12 (the portion near the hole core 26) is a wide space where the ribs 23 and 24 do not exist. For this reason, when the air duct 12 and the ribs 23 and 24 are integrally formed to form the air guiding means 9, the air passage 14 of the bent portion 19 is formed.
The space at the center of the air guide means 9 can be used for cutting the air guide means 9 at the time of molding, and this molding can be facilitated. [0038] The above is due to the illustrated example, the cross-sectional shape of the air passage 14 of the air duct 12 is rectangular, oval, but it may also be the like circle. [0039] (Embodiment of the invention) [0040] Figure 7 shows an embodiment of the present invention. [0041] In Figure, the rib 23 and 24, as viewed in the line of sight along the longitudinal direction, is trapezoidal, the base width W ₁ is larger than the top width W _2.
Further, the rib 23, 24 are arranged alternately in the width direction of the air duct 12, the height dimension H> top width W _2,
Further, the interval P between the ribs 23 and 24 and the height H of the ribs 23 and 24 are unequal to each other. [0042] According to the above arrangement, since the conditions on the dimensions and arrangement of the ribs 23 and 24 are different from each other, when the air _{A 1} to flow through the air passage 14 in the bent portion 19 is guided by the ribs 23, 24 The size of the vortex generated near the surfaces of the ribs 23 and 24 is not constant, and the wind noise does not occur when concentrated in a specific frequency band. If the side portions 34 of the ribs 23 and 24 are omitted, the cross-sectional area can be changed without impairing the performance of the ribs 23 and 24.
It is possible to flow control of the air A _1. The side portion 34
If the molding die is formed in advance so as to obtain the ribs 23 and 24 from which the ribs have been removed, the change in the cross-sectional area of the ribs 23 and 24 and the accompanying air A ₁ after the molding of the die as described above.
Can be performed simply by removing the mold, and therefore, the mold can be easily corrected, and the control can be easily performed at low cost. Other constructions and operations are different from those of the present invention described above.
Since this is the same as the comparative example , the same reference numerals are given to the drawings, and the duplicate description will be omitted. According to the present invention, when the air duct is viewed from one direction, the air duct has a bent portion from its upstream side to its downstream side. Ribs are integrally provided on both sides of the inner surface of the bent portion of the air duct which are opposed to each other in the one direction, and the ribs extend along the hole core of the bent portion as viewed from the one direction. It is bent as follows. For this reason, when the air flowing through the air passage of the bent portion attempts to move toward the inner surface of the bent portion on the inner surface of the bent portion due to its inertial force, a part of the air is guided by the rib, The air is prevented from flowing intensively along the inner surface on the valley fold side. Therefore, the air flows more uniformly in each section of the cross section of the air passage in the bent portion, and the air separates from the inner surface of the bent portion on the inner surface of the bent portion to generate a vortex. Therefore, an increase in pressure loss of air at the bent portion is suppressed. Further, as described above, since the rib is formed integrally with the facing surface, a part of the mounting member for the air guide unlike the above-mentioned conventional technique does not project,
Therefore, generation of wind noise due to air flowing through the air passage in the bent portion is prevented. Further, as described above, since the ribs are integrally formed on the opposing surface, an increase in the number of parts of the air guide means is prevented, and the structure of the air guide means is simplified. Further, since the ribs protrude from the opposing surface, and the height is sufficiently shorter than the distance between the opposing surfaces, the center of the air passage at the bent portion of the air duct is provided. The part is a wide space where no ribs exist. For this reason,
When the air duct and the rib are integrally formed to form the air guide means, the space at the center of the air passage of the bent portion can be used for cutting the air guide means at the time of molding. Molding can be easily performed. That is, as described above, even when the pressure loss of the air flowing through the bent portion of the air duct is suppressed to prevent wind noise, the configuration of the air guide means may be complicated. This can be prevented, and the air guide means can be easily formed. Further, the rib is arranged along the longitudinal direction.
Viewed from line of sight, the base width is larger than the top width
Trapezoidal shape, and the ribs
Are provided alternately in the width direction of the connector. For this reason, the arrangement of the ribs on each of the opposing surfaces described above
Due to differences in installation conditions, wind noise
This does not occur if the frequency band is concentrated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial enlarged view of FIG. 3 in a first embodiment. FIG. 2 is a perspective view of the air conditioner according to the first embodiment. FIG. 3 is a plan view of the air conditioner according to the first embodiment. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 1 in the first embodiment. FIG. 5 is a cross-sectional view taken along line 5-5 of FIG. 1 in the first embodiment. FIG. 6 is a diagram showing experimental data in the first embodiment. FIG. 7 is a diagram corresponding to FIG. 5 in the second embodiment. DESCRIPTION OF SYMBOLS 1 Body 2 Cabin 5 Air conditioner 6 Heater unit 7, 8 Air outlet 9 Air guide means 12 Air duct 14 Air passage 17 Upstream side 18 Downstream side 19 Bend 21, 22 Opposing surface 23 , 24 rib 26 hole core 28 valley fold side inner surface 29 mountain fold side inner surface 30 vortex 32 air guide groove A air A ₁ , A ₂ air

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F24F 13/02 B60H 1/00 102

Claims (1)

(57) [Claims] [Claim 1] When the air duct is viewed from one direction,
In the air guide means having a bent portion from the upstream side to the downstream side of the air duct, ribs are integrally formed on both opposing surfaces of the inner surface of the bent portion of the air duct which oppose each other in the one direction. When viewed from the one direction, the rib is bent along the hole center of the bent portion, and the rib is viewed from the line of sight along the longitudinal direction, and the base is bent.
The trapezoidal shape whose width is larger than the width of the top
Alternate in the width direction of the air duct with respect to the opposite surfaces.
The air guide structure of the bent part of the air duct provided in the area.