WO2019198572A1

WO2019198572A1 - Air discharge device

Info

Publication number: WO2019198572A1
Application number: PCT/JP2019/014658
Authority: WO
Inventors: 潤山岡; 雅晴酒井; 侑児岡村; 康彦新美; 隆仁中村; 小松原　祐介; 真梨恵長濱; 康揮大森; 将悟早川; 悟司蛸谷
Original assignee: 株式会社デンソー
Priority date: 2018-04-11
Filing date: 2019-04-02
Publication date: 2019-10-17

Abstract

An air discharge device (1) equipped with a discharge section (10) for discharging a stream of air. The discharge section includes: at least one main opening (14) through which an airstream serving as an operating airstream is discharged; and a separation (50) for separating, from a center line (CLm) of the main opening, a center portion (BLc) of the thickness (δ) of the velocity boundary layer (BL) of the operating airstream downstream from an outlet of the main opening.

Description

Air blowing device

Cross-reference to related applications

This application includes Japanese Patent Application No. 2018-76325 filed on April 11, 2018, Japanese Patent Application No. 2018-199383 filed on October 23, 2018, and December 25, 2018. Is based on Japanese Patent Application No. 2018-240806 filed in Japan, the contents of which are incorporated herein by reference.

The present disclosure relates to an air blowing device including a blowing unit that blows out an air flow.

2. Description of the Related Art Conventionally, an air nozzle is known in which an auxiliary air outlet is provided around a main hole that forms an air flow serving as a working airflow, and an auxiliary air outlet that forms a support airflow that prevents the air around the main hole being drawn into the working airflow. (For example, refer to Patent Document 1).

JP-A-8-318176

The present inventors diligently studied the air drawing action when the air flow is blown out from the main hole in order to further increase the reach distance of the air flow. As a result, it has been found that the air drawing action is caused by a lateral vortex generated by a shearing force due to the velocity gradient of the working fluid when the working air current is blown from the main hole. The horizontal vortex is a vortex having a vortex center perpendicular to the mainstream flow direction.

As a result of further investigation by the present inventors, in the vicinity of the downstream of the main hole outlet, innumerable transverse vortices generated in the velocity boundary layer are synthesized near the center of the thickness of the velocity boundary layer and developed into a large-scale one. The knowledge that the air drawing-in action becomes stronger was obtained.

However, the above-described conventional technique only discloses providing an auxiliary air outlet around the main hole, and does not show any knowledge about the present inventors, further improving the reach of the airflow. It is difficult to expect.
An object of this indication is to provide the air blowing apparatus which can lengthen the reach | attainment distance of the working airflow which blows off from a main hole.

By the way, the central portion of the working airflow is less affected by the air drawing action than the portions other than the central portion of the working airflow, and the reach of the working airflow blown out of the main hole at the central portion of the working airflow tends to be longer. is there. According to the study by the present inventors, it has been found that it is effective that the central portion of the working air current is separated from the velocity boundary layer in order to increase the reach distance of the working air current blown out from the main hole.
According to one aspect of the present disclosure, the air blowing device includes a blowing unit that blows out an air flow. And the blowing part has at least one main hole that blows out the airflow that becomes the working airflow, and a separation structure for separating the central portion of the thickness of the velocity boundary layer of the working airflow from the centerline of the main hole downstream of the outlet of the main hole , Including.

By adopting a structure that separates the central part of the working air current blown out from the main hole and the central part of the thickness of the velocity boundary layer in this way, the attenuation of the flow velocity in the central part of the working air flow is reduced, and the It is possible to lengthen the reach of the working airflow. Reference numerals in parentheses attached to each component and the like indicate an example of a correspondence relationship between the component and the like and specific components described in the embodiments described later.

It is a typical perspective view of the air blowing apparatus which concerns on 1st Embodiment. It is a typical front view of the air blowing apparatus which concerns on 1st Embodiment. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. It is explanatory drawing for demonstrating the velocity gradient of the airflow in the exit downstream of the 1st nozzle used as the 1st comparative example. It is explanatory drawing for demonstrating the state of the airflow in the exit downstream of the 1st nozzle used as the 1st comparative example. It is explanatory drawing for demonstrating the velocity gradient of the airflow in the exit downstream of the 2nd nozzle used as the 2nd comparative example. It is explanatory drawing for demonstrating the velocity gradient of the working airflow in the downstream of the exit of the main hole of the air blowing apparatus which concerns on 1st Embodiment. It is explanatory drawing for demonstrating the state of the working airflow in the downstream of the exit of the main hole of the air blowing apparatus which concerns on 1st Embodiment. It is a typical perspective view of the air blowing apparatus which concerns on 2nd Embodiment. It is a typical front view of the air blowing apparatus which concerns on 2nd Embodiment. It is XI-XI sectional drawing of FIG. It is explanatory drawing for demonstrating the velocity gradient of the working airflow in the downstream of the exit of the main hole of the air blowing apparatus which concerns on 2nd Embodiment. It is typical sectional drawing of the air blowing apparatus which concerns on 3rd Embodiment. It is an enlarged view of the XIV part of FIG. It is explanatory drawing for demonstrating the velocity gradient of the working airflow in the downstream of the exit of the main hole of the air blowing apparatus which concerns on 3rd Embodiment. It is typical sectional drawing of the air blowing apparatus which concerns on 4th Embodiment. It is explanatory drawing for demonstrating the velocity gradient of the working airflow downstream of the exit of the main hole of the air blowing apparatus which concerns on 4th Embodiment. It is explanatory drawing for demonstrating the state of the working airflow in the downstream of the exit of the main hole of the air blowing apparatus which concerns on 4th Embodiment. It is typical sectional drawing of the air blowing apparatus which concerns on 5th Embodiment. It is explanatory drawing for demonstrating the velocity gradient of the working airflow in the downstream of the exit of the main hole of the air blowing apparatus which concerns on 5th Embodiment. It is typical sectional drawing of the air blowing apparatus which concerns on 6th Embodiment. It is explanatory drawing for demonstrating the velocity gradient of the working airflow in the downstream of the exit of the main hole of the air blowing apparatus which concerns on 6th Embodiment. It is typical sectional drawing of the air blowing apparatus which concerns on 7th Embodiment. It is explanatory drawing for demonstrating the velocity gradient of the working airflow in the downstream of the exit of the main hole of the air blowing apparatus which concerns on 7th Embodiment. It is typical sectional drawing of the air blowing apparatus which concerns on 8th Embodiment. It is explanatory drawing for demonstrating the velocity gradient of the working air current in the downstream of the exit of the main hole of the air blowing apparatus which concerns on 8th Embodiment. It is typical sectional drawing of the air blowing apparatus which concerns on 9th Embodiment. It is a typical top view of the structure provided in the air blowing apparatus which concerns on 9th Embodiment. It is typical sectional drawing in the outlet downstream of the main hole in the main flow path of the air blowing apparatus which concerns on 9th Embodiment. It is typical sectional drawing of the air blowing apparatus which concerns on 10th Embodiment. It is typical sectional drawing of the air blowing apparatus which concerns on 11th Embodiment. It is explanatory drawing for demonstrating the velocity gradient of the working airflow in the downstream of the exit of the main hole of the air blowing apparatus which concerns on 11th Embodiment. It is typical sectional drawing which shows the 1st modification of the air blowing apparatus which concerns on 11th Embodiment. It is typical sectional drawing which shows the 2nd modification of the air blowing apparatus which concerns on 11th Embodiment.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following embodiments, the same or equivalent parts as those described in the preceding embodiments are denoted by the same reference numerals, and the description thereof may be omitted. Further, in the embodiment, when only a part of the constituent elements are described, the constituent elements described in the preceding embodiment can be applied to the other parts of the constituent elements. The following embodiments can be partially combined with each other even if they are not particularly specified as long as they do not cause any trouble in the combination.

(First embodiment)
This embodiment will be described with reference to FIGS. The air blowing device 1 of this embodiment is applied to an air outlet of an air conditioning unit that air-conditions a vehicle interior. Although not shown, the air conditioning unit is disposed inside an instrument panel provided in the foremost part of the vehicle interior. And the air blower outlet of an air-conditioning unit is provided in the instrument panel and its inner side.

As shown in FIGS. 1 and 2, the air blowing device 1 includes a blowing unit 10 that blows out an air flow. The blow-out unit 10 is formed with an air flow path for guiding an air flow adjusted to a desired temperature by the air conditioning unit into the room. The blowing part 10 includes a duct part 16, a hole forming part 12 that forms a main hole 14 that blows out an airflow that serves as a working airflow, and a flange part 20 that is provided outside the duct part 16.

The duct portion 16 is a member that forms a flow path through which an airflow blown into the room is passed. The duct part 16 is comprised with the cylindrical member. The shape of the duct portion 16 as viewed from the air flow direction is a flat shape having a horizontal width larger than the vertical width. Further, the duct portion 16 has a shape in which the shape along the air flow direction is narrowed from the air flow upstream side to the downstream side.

As shown in FIG. 3, a partition portion 26 is provided in the duct portion 16 near the downstream portion than the upstream portion. The partition portion 26 is configured in a cylindrical shape, and is arranged inside the duct portion 16 so as to have a predetermined gap with respect to the duct portion 16. Inside the duct portion 16, an inner flow path and an outer flow path are formed by the partition portion 26. That is, the duct part 16 has a double flow path structure by arranging the partition part 26 on the inside thereof.

The main flow path 18 is formed in the center part inside the duct part 16. The main flow path 18 is configured by a space inside the partition portion 26. The main flow path 18 is a flow path through which a working air current blown from a main hole 14 described later passes.

Further, an auxiliary flow path 24 is formed inside the duct portion 16 at the outer portion of the main flow path 18. The auxiliary flow path 24 is configured by a gap formed between the partition portion 26 and the duct portion 16. The auxiliary flow path 24 is a flow path through which the support airflow blown out from the auxiliary hole 22 passes.

The main flow path 18 and the auxiliary flow path 24 are partitioned by the partition portion 26 described above. The main flow path 18 and the auxiliary flow path 24 are in communication with each other at the upstream portion of the duct portion 16.

The duct part 16 is fitted into an air outlet of an air conditioning unit (not shown) on the upstream side of the air flow. Further, the duct portion 16 is connected to the outer periphery of the hole forming portion 12 at the downstream side of the air flow.

The hole forming part 12 is positioned at the end of the duct part 16 on the downstream side of the air flow. The hole forming portion 12 is a plate-like member that constitutes an end surface of the duct portion 16 on the downstream side of the air flow, and has a predetermined thickness in the air flow direction. The hole forming part 12 is also a connection part that connects the duct part 16 and the partition part 26. The hole formation part 12 is comprised by the cylinder shape so that air can be blown out. The shape of the hole forming portion 12 as viewed from the air flow direction is a flat shape whose horizontal width is larger than the vertical width. The hole forming portion 12 has a main hole 14 opened as a single hole at the center thereof. The main hole 14 is an opening for blowing out the conditioned air whose temperature is adjusted by the air conditioning unit as a working air flow into the vehicle interior.

The shape of the main hole 14 as viewed from the air flow direction is an oval shape whose horizontal width is larger than vertical width. Specifically, the main hole 14 has a shape formed by connecting parallel line segments of equal length with a pair of curved curves.

The main hole 14 is a hole connected to the main flow path 18. The main hole 14 is formed in the partition 26 in a range located upstream from the end on the downstream side of the air flow by the thickness of the hole forming part 12. The main hole 14 has an inner wall surface 141 extending along the air flow direction.

Further, a plurality of auxiliary holes 22 are formed in the hole forming portion 12 so as to surround the periphery of the main hole 14. The auxiliary hole 22 is an opening for blowing out a support airflow for suppressing the air drawing action by the working airflow blown out from the main hole 14.

2, the plurality of auxiliary holes 22 are formed so as to surround the main hole 14 in the hole forming portion 12. The plurality of auxiliary holes 22 are formed outside the portion of the hole forming portion 12 that forms the outer edge portion of the main hole 14. The plurality of auxiliary holes 22 are formed so that the intervals between them are equal. The plurality of auxiliary holes 22 are formed as round holes having a smaller cross-sectional area than the main hole 14.

The auxiliary hole 22 is a hole that continues to the auxiliary flow path 24. The auxiliary hole 22 is formed in a range of the partition portion 26 and the duct portion 16 that is located upstream from the end on the downstream side of the air flow by the thickness of the hole forming portion 12. The auxiliary hole 22 has an inner wall surface 221 that extends along the air flow direction.

The flange part 20 is a member for attaching the blowing part 10 to an instrument panel (not shown). The flange portion 20 is composed of a rectangular member provided so as to protrude from the duct portion 16 with respect to the outer periphery of the duct portion 16. The flange portion 20 is attached to the instrument panel by a connecting member such as a screw in a state where the upstream portion of the duct portion 16 is fitted to the air outlet of the air conditioning unit. The flange portion 20 is formed with through holes 201 through which connecting members such as screws are passed in the vicinity of the four corners forming the corner portions.

Each of the hole forming part 12, the duct part 16, the flange part 20, and the partition part 26 constituting the blowing part 10 is made of resin. The hole forming part 12, the duct part 16, the flange part 20, and the partition part 26 are formed of an integrally molded product that is integrally formed by a molding technique such as injection molding. In addition, the hole formation part 12, the duct part 16, the flange part 20, and the partition part 26 may be comprised by the part separately. As described above, the blowing unit 10 configured in this manner is installed on an instrument panel (not shown).

Here, in recent years, instrument panels have been required to be thin in the vertical direction of the vehicle from the viewpoint of expansion of the passenger compartment and design. In addition, the instrument panel tends to be provided with a large information device for notifying various information indicating the driving state of the vehicle at a central portion in the vehicle width direction or a portion facing the occupant in the vehicle longitudinal direction. As a result, the air conditioning unit requires measures such as making the air outlet thin, but if the air outlet is made thin, it blows out from the air outlet due to the lateral vortex Vt generated downstream of the air outlet. The collapse of the core portion of the airflow is accelerated, and the reach distance of the airflow in the passenger compartment is shortened. For this reason, the air blowing device 1 is required to increase the reach of the airflow blown into the vehicle interior.

In order to further increase the reach of the airflow blown into the vehicle interior, the present inventors diligently studied the air drawing action when the airflow was blown out from the main hole 14. As a result, it has been found that the air drawing action is caused by the lateral vortex Vt generated by the shearing force due to the velocity gradient of the working air flow when the working air flow is blown out from the main hole 14. Hereinafter, the air drawing action will be described with reference to FIGS. 4 and 5.

FIG. 4 is a schematic diagram showing a first nozzle CE1 that is a first comparative example of the air blowing device 1 of the present embodiment. The first nozzle CE1 is formed of a cylindrical tube having a substantially constant cross-sectional area, and the opening on one end side forms the main hole Hm1.

As shown in FIG. 4, when the air flow is blown out from the main hole Hm1 of the first nozzle CE1, it is caused by the difference in velocity between the air flow from the main hole Hm1 and the air stationary around it at the outlet downstream of the main hole Hm1. Thus, the velocity boundary layer BL is formed. The velocity boundary layer BL is a layer that is affected by stationary air among the airflows blown from the main hole Hm1 of the first nozzle CE1.

In the velocity boundary layer BL, as shown in FIG. 5, innumerable transverse vortices Vt are generated by the shearing force due to the velocity gradient. According to the study by the present inventors, innumerable transverse vortices Vt generated in the velocity boundary layer BL are synthesized in the vicinity of the central portion BLc of the thickness δ of the velocity boundary layer BL and developed into a large-scale one. It was found that the air drawing action tends to be stronger.

Here, the thickness δ of the velocity boundary layer BL reaches a position where it becomes 99% (that is, 0.99 × U _∞ ) of the velocity U _∞ of the main flow (that is, potential flow) that flows outside the velocity boundary layer BL from the wall surface. Is defined as the length of The thickness δ of the velocity boundary layer BL is calculated based on the following formula F1, for example.

δ = 5 × (ν × x / U _∞ ) ^1/2 (F1)
However, in Formula F1, ν represents a kinematic viscosity coefficient, x represents a position in the main flow direction, and U _∞ represents a main flow speed (that is, a uniform flow speed). As the definition formula of the thickness δ of the velocity boundary layer BL, in addition to the formula F1 described above, for example, a definition formula based on the excluded thickness or a definition formula based on the momentum thickness can be used.

FIG. 6 is a schematic diagram showing a second nozzle CE2 which is a second comparative example of the air blowing device 1 of the present embodiment. The second nozzle CE2 is configured by a cylindrical tube in which a main hole Hm2 and a plurality of auxiliary holes Hs surrounding the main hole Hm2 are formed on one end side thereof. As shown in FIG. 6, when an air flow is blown out from the main hole Hm2 and the auxiliary hole Hs of the second nozzle CE2, the velocity boundary layer BL of the working air flow along the inner wall surface of the main hole Hm2 downstream of the main hole Hm2. Is formed. In the velocity boundary layer BL, it is considered that the lateral vortex Vt is likely to occur near the central portion BLc of the thickness δ.

On the other hand, the main flow of the support airflow blown out from the auxiliary hole Hs is blown out in parallel with the working airflow from the main hole Hm2 in a state where there is a predetermined interval LS from the central portion BLc of the thickness δ of the velocity boundary layer BL. . That is, in the second nozzle CE2, the mainstream AFs of the support airflow blown out from the auxiliary hole Hs flows away from the center portion BLc of the thickness δ of the velocity boundary layer BL.

In such a case, the main flow of the support airflow is separated from the vortex center of the transverse vortex Vt generated in the velocity boundary layer BL, and the transverse vortex Vt is not easily collapsed by the support airflow, and the development of the lateral vortex Vt generated in the velocity boundary layer BL is suppressed. It is considered that the suppression effect is difficult to obtain.

The inventors of the present invention can suppress the development of the lateral vortex Vt generated in the velocity boundary layer BL by bringing the main flow of the support airflow close to the vortex of the lateral vortex Vt generated in the velocity boundary layer BL of the working airflow. In consideration, the vortex suppressing structure is added to the blowing portion 10. This vortex suppression structure is also a separation structure for separating the velocity boundary layer BL of the working airflow from the central portion of the working airflow.

As shown in FIG. 3, the blowing portion 10 of the present embodiment has an enlarged portion in which the cross-sectional area Sc is larger than the opening area Sm of the main hole 14 with respect to the main flow path 18 of the duct portion 16 as a vortex suppression structure. 180 is provided.

The inner wall surface 181 of the partition portion 26 that forms the main flow path 18 has a shape in which the wall surface shape tapers from the portion having the largest cross-sectional area in the enlarged portion 180 toward the main hole 14. The enlarged portion 180 is configured by a portion of the inner wall surface 181 of the partition portion 26 that forms the main flow path 18 that has a cross-sectional area that decreases from the air flow upstream side to the downstream side. In other words, the cross-sectional area of the enlarged portion 180 is continuously reduced as it approaches the main hole 14 so as to be continuously connected to the main hole 14. The enlarged portion 180 is set so that the ratio between the maximum cross-sectional area Sc and the opening area Sm of the main hole 14 is, for example, 7 to 2. The cross-sectional area Sc of the enlarged portion 180 is a cross-sectional area at a portion where the flow path cross-sectional area is the largest in the main flow path 18. Specifically, the cross-sectional area Sc of the enlarged portion 180 is a cross-sectional area at the end of the partition portion 26 on the upstream side of the air flow. The opening area Sm of the main hole 14 is a cross-sectional area at the end of the partitioning portion 26 on the downstream side of the air flow.

As shown in FIG. 7, in the blowout portion 10 of the present embodiment configured as described above, when the conditioned air whose temperature is adjusted by the air conditioning unit flows into the duct portion 16, the conditioned air is passed through the main channel 18 through the main hole 18. It flows toward 14.

The main flow path 18 is provided with an enlarged portion 180 having a cross-sectional area Sc larger than the opening area Sm of the main hole 14, so that contraction occurs from the enlarged portion 180 to the main hole 14. Thereby, in the main flow path 18, the flow velocity difference between the vicinity of the center line CLm of the main hole 14 and the vicinity of the inner wall surface 181 forming the main flow path 18 is reduced. The reason why the flow velocity of the air flow near the inner wall surface 181 forming the main flow path 18 is increased is that centrifugal force acts on the air flow along the wall surface by the action of the curvature of the inner wall surface 181 forming the main flow path 18. The contracted flow is a phenomenon in which the difference between the flow velocity near the flow channel wall surface of the air flow and the flow velocity of the main flow is reduced by reducing the cross section of the flow channel.

Then, when the airflow is blown out from the main hole 14 and the auxiliary hole 22, the velocity boundary layer BL of the working airflow is formed along the inner wall surface 141 of the main hole 14 downstream of the outlet of the main hole 14. The thickness δ of the velocity boundary layer BL is smaller than that of the second comparative example due to contraction of the main flow path 18.

When the thickness δ of the velocity boundary layer BL of the working airflow formed downstream from the outlet of the main hole 14 is small, the main portion of the support airflow blown out from the center portion BLc of the thickness δ of the velocity boundary layer BL and the auxiliary hole 22 is mainly used. It will be in the state which approaches at the exit downstream of the hole 14. That is, in the blowout portion 10 of the present embodiment, the mainstream AFs of the support airflow blown out from the auxiliary hole 22 flows in a state of approaching the central portion BLc of the thickness δ of the velocity boundary layer BL. Specifically, the interval LS between the main flow of the support airflow and the central portion BLc of the thickness δ of the velocity boundary layer BL is smaller than that in the second comparative example.

In this case, as shown in FIG. 8, the main flow of the support airflow flows near the vortex center of the transverse vortex Vt generated in the velocity boundary layer BL, and the transverse vortex Vt is easily collapsed by the support airflow. The effect of suppressing the development of the lateral vortex Vt that occurs in the velocity boundary layer BL downstream of the outlet of the gas can be easily obtained.

As described above, in the air blowing device 1 according to the present embodiment, the development of the lateral vortex Vt generated in the velocity boundary layer BL downstream of the outlet of the main hole 14 can be suppressed by the enlarged portion 180 provided in the main flow path 18. In the present embodiment, the enlarged portion 180 provided in the main channel 18 functions as a vortex suppression structure. More specifically, the enlarged portion 180 functions as a layer reduction structure that reduces the thickness δ of the velocity boundary layer BL formed along the inner wall surface 141 of the main hole 14.

In the air blowing device 1 described above, a vortex suppression structure is realized by the enlarged portion 180 provided in the main flow path 18. According to this, the airflow blown out from the central part BLc of the thickness boundary δ of the velocity boundary layer BL formed at the outlet downstream of the main hole 14 and the auxiliary hole 22 approaches downstream of the outlet of the main hole 14. That is, if the main flow path 18 is provided with the enlarged portion 180, the flow velocity difference between the center line CLm of the main hole 14 and the vicinity of the inner wall surface 141 is reduced due to contraction in the vicinity of the main hole 14. The thickness δ of the velocity boundary layer BL formed downstream from the outlet of the main hole 14 can be reduced.

Thereby, the development of the transverse vortex Vt in the velocity boundary layer BL is sufficiently suppressed by the support airflow blown out from the auxiliary hole 22. As a result, the drawing of air from the surroundings to the working airflow blown out from the main hole 14 is suppressed, and the flow velocity of the working airflow blown out from the main hole 14 is less attenuated. The reach of the air current becomes longer.

In particular, when air-conditioned air whose temperature has been adjusted by the air-conditioning unit is blown out from the main hole 14 as a working airflow, air drawing from the surroundings is suppressed to the working airflow blown out from the main hole 14, so that air can be drawn in. The temperature change of the working airflow resulting from it can be suppressed. That is, according to the air blowing device 1 of the present embodiment, an airflow having an appropriate temperature can reach a desired location. This is particularly effective in realizing spot-like air conditioning in the passenger compartment. In the present embodiment, the enlarged portion 180 provided in the main flow path 18 functions as a separation structure for separating the velocity boundary layer BL of the working airflow from the central portion of the working airflow.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. The present embodiment is different from the first embodiment in that the reduced flow fins 28 for reducing the airflow flowing through the main flow path 18 are provided inside the duct portion 16. In the present embodiment, portions different from those in the first embodiment will be mainly described, and description of portions similar to those in the first embodiment may be omitted.

As shown in FIG. 9, the blowing portion 10 of the present embodiment is provided with a contracted fin 28 inside the duct portion 16. As shown in FIG. 10, the contraction fin 28 is formed at a substantially central portion of the short side of the inner wall surface 141 of the main hole 14 so that the main flow path 18 formed inside the duct portion 16 is vertically divided. The main hole 14 extends along the long side of the inner wall surface 141. Although not shown, the contracted fins 28 are connected to the inside of the duct portion 16 at both ends in the longitudinal direction. The contraction fin 28 is also a structure that contracts the airflow flowing through the main flow path 18 as a layer contraction structure.

As shown in FIG. 11, the contracted fins 28 are positioned at a portion where the main flow path 18 inside the duct portion 16 is formed so as not to protrude from the main hole 14. Specifically, the contracted fin 28 is a position that overlaps a part of the partition portion 26 in the direction perpendicular to the center line CLm of the main flow path 18 within the duct portion 16, and is inside the main hole 14. It is arranged at a position that does not overlap the wall surface 141.

Also, the contracted fin 28 has a teardrop shape with a cross section having excellent aerodynamic characteristics. In other words, the contracted fin 28 has a curved surface with a rounded front edge portion on the upstream side of the air flow, and a sharp curved surface on the downstream edge of the downstream side of the air flow as compared with the front edge portion. Further, the contraction fin 28 has a maximum cross-sectional thickness at a position closer to the front edge portion than to the rear edge portion.

In the blowing unit 10 of the present embodiment configured as described above, as shown in FIG. 12, when the conditioned air whose temperature is adjusted by the air conditioning unit flows into the duct unit 16, the conditioned air flows through the main channel 18 through the main hole 18. It flows toward 14.

The main flow path 18 is provided with an enlarged portion 180 having a cross-sectional area Sc larger than the opening area Sm of the main hole 14, so that contraction occurs from the enlarged portion 180 to the main hole 14. In addition, the main flow path 18 is bifurcated by the reduced flow fins 28, so that a reduced flow is generated before reaching the main hole 14.

As described above, the contraction fin 28 is positioned at a portion where the main flow path 18 inside the duct portion 16 is formed so as not to protrude from the main hole 14. For this reason, on the inner side of the duct portion 16, the upstream section A in which the channel cross-sectional area is reduced by the contraction fin 28, the intermediate section B in which the channel cross-sectional area is larger than the upstream section A, and the channel cross-sectional area are almost changed. A downstream section C is formed.

In the upstream section A, the flow cross-sectional area is reduced by the contracted fins 28 and the airflow is compressed, whereby the flow velocity between the vicinity of the center line CLm of the main hole 14 and the vicinity of the inner wall surface 181 that forms the main flow path 18. The difference is sufficiently small. That is, in the upstream section A, the thickness δ of the velocity boundary layer BL in the vicinity of the inner wall surface 181 forming the main flow path 18 is reduced toward the downstream side due to the contraction effect by the contraction fins 28.

On the other hand, in the intermediate section B and the downstream section C, which are downstream of the upstream section A, the flow path cross-sectional area is not small, so the thickness δ of the velocity boundary layer BL near the inner wall surface 181 forming the main flow path 18 is downstream. Grows toward the side.

Specifically, in the intermediate section B, which is the downstream side of the upstream section A, the flow path cross-sectional area is enlarged, so that the thickness δ of the velocity boundary layer BL near the inner wall surface 181 forming the main flow path 18 is the downstream side. It gradually grows toward. However, in the contracted fin 28, the amount of change in the thickness of the cross section on the trailing edge side on the downstream side of the air flow is smaller than that on the leading edge side. For this reason, the change in the channel cross-sectional area in the intermediate section B becomes gentler than the change in the upstream section A, and the increase amount of the thickness δ of the speed boundary layer BL in the intermediate section B is the speed boundary layer BL in the upstream section A. This is sufficiently smaller than the reduction amount of the thickness δ.
Further, in the downstream section C, which is downstream of the intermediate section B, the flow path cross-sectional area is constant, so the thickness δ of the velocity boundary layer BL near the inner wall surface 181 forming the main flow path 18 is slightly lower toward the downstream side. growing. However, the increase amount of the thickness δ of the velocity boundary layer BL in the downstream section C is extremely smaller than the decrease amount of the thickness δ of the velocity boundary layer BL in the upstream section A.

As described above, the amount of decrease in the thickness δ of the velocity boundary layer BL in the upstream section A by the contraction fin 28 is sufficiently larger than the increase in the thickness δ of the velocity boundary layer BL in the intermediate section B and the downstream section C. .

Thereby, in the main flow path 18, the difference in flow velocity between the vicinity of the center line CLm of the main hole 14 and the vicinity of the inner wall surface 181 forming the main flow path 18 becomes sufficiently small. When the airflow is blown out from the main hole 14 and the auxiliary hole 22, the velocity boundary layer BL of the working airflow is formed along the inner wall surface 141 of the main hole 14 downstream of the outlet of the main hole 14. The thickness δ of the speed boundary layer BL is smaller than that in the first embodiment.

For this reason, in the blowing portion 10 of the present embodiment, the mainstream AFs of the support airflow blown out from the auxiliary hole 22 flows in a state of approaching the central portion BLc of the thickness δ of the velocity boundary layer BL. As a result, the main flow of the support airflow flows in the vicinity of the vortex center of the transverse vortex Vt generated in the velocity boundary layer BL. The effect of suppressing the development of the lateral vortex Vt is easily obtained. In the present embodiment, the enlarged portion 180 and the contracted fin 28 provided in the main channel 18 function as a vortex suppressing structure. More specifically, each of the enlarged portion 180 and the contracted fin 28 functions as a layer reducing structure that reduces the thickness δ of the velocity boundary layer BL formed along the inner wall surface 141 of the main hole 14.

The air blowing device 1 of the present embodiment described above has the same configuration as that of the first embodiment, although the contracted fins 28 are added to the main flow path 18. For this reason, the air blowing apparatus 1 of this embodiment can obtain the effect obtained from a structure common to 1st Embodiment similarly to 1st Embodiment.

In particular, in this embodiment, the layer contraction structure includes not only the enlarged portion 180 but also the contraction fins 28. According to this, it is possible to reduce the thickness δ of the velocity boundary layer BL due to contraction while suppressing an increase in the size of the apparatus due to the expansion of the main flow path 18. Such a configuration is suitable when the installation space is greatly limited like a moving body such as a vehicle. In the present embodiment, the enlarged portion 180 and the contracted fin 28 provided in the main flow path 18 function as a separation structure for separating the velocity boundary layer BL of the working airflow from the central portion of the working airflow.

(Modification of the second embodiment)
In the above-described second embodiment, the contracted fins 28 are exemplified with the cross-sectional shape being a teardrop shape, but are not limited thereto. For example, the contracted fins 28 may have an oval cross-sectional shape extending along the airflow of the main flow path 18. Moreover, as the contraction fin 28, what has a grid | lattice shape may be employ | adopted, for example.

In the second embodiment described above, the example in which the enlarged portion 180 is provided with respect to the main flow path 18 has been described, but the present invention is not limited to this. The air blowing device 1 may be configured such that only the contracted fins 28 are arranged with respect to the main flow path 18 and the enlarged portion 180 is not provided with respect to the main flow path 18. In this case, the contraction fins 28 function as a layer contraction structure that reduces the thickness δ of the velocity boundary layer BL formed along the inner wall surface 141 of the main hole 14.

(Third embodiment)
Next, a third embodiment will be described with reference to FIGS. The present embodiment is different from the first embodiment in that the uneven portion 30 is provided on the inner wall surface 181 that forms the main flow path 18. In the present embodiment, portions different from those in the first embodiment will be mainly described, and description of portions similar to those in the first embodiment may be omitted.

As shown in FIG. 13, in the blowing portion 10 of the present embodiment, the concave portions and the convex portions are alternately arranged along the flow direction of the air flow in the main flow path 18 with respect to the inner wall surface 181 that forms the main flow path 18. An uneven portion 30 is provided. Specifically, the concavo-convex portion 30 is formed in substantially the entire area inside the partition portion 26 that partitions the main flow path 18 and the auxiliary flow path 24 inside the duct portion 16.

As shown in FIG. 14, the concavo-convex portion 30 is formed by a plurality of grooves 301 provided on the inner wall surface 181 that forms the main flow path 18. The plurality of grooves 301 are formed so as to be arranged at predetermined intervals along the airflow direction in the main flow path 18. The groove 301 is configured by a circular or polygonal depression. In addition, the groove | channel 301 may be comprised by the slit groove | channel where the cross section which cross | intersects the flow direction of the airflow in the main flow path 18 is V-shaped, for example.

In the blowing unit 10 of the present embodiment configured as described above, when the conditioned air whose temperature is adjusted by the air conditioning unit flows into the duct unit 16 as shown in FIG. It flows toward 14.

The main flow path 18 is provided with an enlarged portion 180 having a cross-sectional area Sc larger than the opening area Sm of the main hole 14, so that contraction occurs from the enlarged portion 180 to the main hole 14. In addition, the inner wall surface 181 that forms the main flow path 18 is formed with a concavo-convex part 30 in which concave parts and convex parts are alternately arranged in the main flow direction in the main flow path 18.

As shown in FIG. 14, in the concavo-convex portion 30, vortices are generated in the plurality of grooves 301 when the airflow passes near the inner wall surface 181 that forms the main flow path 18. And the vortex which arises inside the uneven | corrugated | grooved part 30 plays a role like a ball bearing, and the friction coefficient of the inner wall surface 181 which forms the main flow path 18 becomes small. Thereby, in the main flow path 18, the flow velocity difference between the vicinity of the center line CLm of the main hole 14 and the vicinity of the inner wall surface 181 forming the main flow path 18 is reduced.

Then, when the airflow is blown out from the main hole 14 and the auxiliary hole 22, the velocity boundary layer BL of the working airflow is formed along the inner wall surface 141 of the main hole 14 downstream of the outlet of the main hole 14. The thickness δ of the speed boundary layer BL is smaller than that of the first embodiment due to the effect of reducing the friction coefficient by the uneven portion 30.

For this reason, in the blowing portion 10 of the present embodiment, the mainstream AFs of the support airflow blown out from the auxiliary hole 22 flows in a state approaching the central portion BLc of the thickness δ of the velocity boundary layer BL. Specifically, the distance LS between the main flow of the support airflow and the central portion BLc of the thickness δ of the velocity boundary layer BL is smaller than that in the first embodiment. As a result, the main flow of the support airflow flows in the vicinity of the vortex center of the transverse vortex Vt generated in the velocity boundary layer BL. The effect of suppressing the development of the lateral vortex Vt is easily obtained. In the present embodiment, the enlarged portion 180 and the concavo-convex portion 30 provided in the main channel 18 function as a vortex suppressing structure. More specifically, each of the enlarged portion 180 and the concavo-convex portion 30 functions as a layer reduction structure that reduces the thickness δ of the velocity boundary layer BL formed along the inner wall surface 141 of the main hole 14.

In the air blowing device 1 of the present embodiment described above, the uneven portion 30 is added to the inner wall surface 181 that forms the main flow path 18, but other configurations are common to the first embodiment. For this reason, the air blowing apparatus 1 of this embodiment can obtain the effect obtained from a structure common to 1st Embodiment similarly to 1st Embodiment.

In the present embodiment, the layer reduction structure includes not only the enlarged portion 180 but also the uneven portion 30. Accordingly, the thickness δ of the velocity boundary layer BL can be made sufficiently small by the effect of reducing the friction coefficient of the inner wall surface 181 forming the main flow path 18 as well as the contraction effect by the enlarged portion 180. .

In particular, in this embodiment, the uneven portion 30 is formed by a plurality of grooves 301 provided on the inner wall surface 181 of the main flow path 18. According to this, compared with the case where the uneven | corrugated | grooved part 30 is comprised with a some protrusion, the magnitude | size of the main flow path 18 can be ensured and the pressure loss in the main flow path 18 can be suppressed. This greatly contributes to the improvement of the reach of the working airflow. In the present embodiment, the enlarged portion 180 and the concavo-convex portion 30 provided in the main flow path 18 function as a separation structure for separating the velocity boundary layer BL of the working airflow from the central portion of the working airflow.

(Modification of the third embodiment)
In the third embodiment described above, the concavo-convex portion 30 is illustrated as being formed by the plurality of grooves 301, but is not limited thereto. The uneven part 30 may be formed by a plurality of protrusions, for example. When the concavo-convex portion 30 is formed by a plurality of protrusions, vortices are generated in the gaps between the plurality of protrusions when the airflow passes near the inner wall surface 181 forming the main flow path 18. Since this vortex plays a role like a ball bearing, the effect similar to the above-mentioned third embodiment can be obtained by this modification.

In the third embodiment described above, the concavo-convex portion 30 is illustrated as being formed in substantially the entire area inside the partition portion 26 that partitions the main flow path 18 and the auxiliary flow path 24 inside the duct portion 16. It is not limited. The uneven portion 30 may be formed on a part of the inside of the partition portion 26.

In the above-described third embodiment, the example in which the enlarged portion 180 is provided with respect to the main flow path 18 has been described, but the present invention is not limited to this. The air blowing device 1 may have a configuration in which the concavo-convex portion 30 is only disposed with respect to the main flow path 18 and the enlarged portion 180 is not provided with respect to the main flow path 18. In this case, the concavo-convex portion 30 functions as a layer reduction structure that reduces the thickness δ of the velocity boundary layer BL formed along the inner wall surface 141 of the main hole 14.

In the third embodiment described above, the structure including the enlarged portion 180 and the concavo-convex portion 30 is exemplified as the layer reduction structure, but the present invention is not limited to this. The layer contraction structure may be, for example, a structure including the enlarged portion 180, the contracted fin 28 and the uneven portion 30, or a structure including the contracted fin 28 and the uneven portion 30.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIGS. The present embodiment is different from the first embodiment in that the main hole 14 is expanded in a trumpet shape. In the present embodiment, portions different from those in the first embodiment will be mainly described, and description of portions similar to those in the first embodiment may be omitted.

As shown in FIG. 16, the blowout portion 10 of the present embodiment has the main hole 14 expanded in a trumpet shape. Specifically, the auxiliary hole is formed on the inner wall surface 141 of the main hole 14 such that a tangent line TLm extending along the inner wall surface 141 of the main hole 14 intersects the center line CLs of the auxiliary hole 22 downstream of the auxiliary hole 22. A main inclined structure 32 that is inclined with respect to the center line CLs of 22 is provided. In other words, the inner wall surface 141 of the main hole 14 is inclined so that the tangent line TLm extending along the inner wall surface 141 intersects the center line CLm of the main hole 14 on the entire circumference. Specifically, the tangent line TLm is a tangent line that extends along the inner wall surface 141 at the downstream end of the inner wall surface 141 of the main hole 14.

Here, in the velocity boundary layer BL formed downstream from the outlet of the main hole 14, there is a tendency that the lateral vortex Vt starts to occur not at the position immediately after the main hole 14 but at a position away from the main hole 14. For example, the horizontal vortex Vt may begin to occur at a position separated by more than twice the minor axis of the main hole 14. Therefore, the inner wall surface 141 of the main hole 14 is desirably set within a range where the angle θm formed between the tangent line TLm and the center line CLs is an acute angle (for example, within a range of 1 ° to 30 °).

Further, in the blowing part 10 of the present embodiment, the cross-sectional area Sc of the main flow path 18 is smaller than the opening area Sm of the main hole 14. That is, the blowing unit 10 of the present embodiment is not provided with a configuration corresponding to the expansion unit 180 of the first embodiment. Note that the cross-sectional area Sc of the main flow path 18 is a cross-sectional area at an end portion on the upstream side of the partition portion 26.

In the blowing unit 10 of the present embodiment configured as described above, as shown in FIG. 17, when the conditioned air whose temperature is adjusted by the air conditioning unit flows into the duct unit 16, the conditioned air flows through the main channel 18 through the main hole 18. It flows toward 14. The airflow flowing into the main flow path 18 is blown out from the main hole 14. At this time, since the main hole 14 is expanded in a trumpet shape, a velocity boundary layer BL of the working airflow is formed downstream from the center line CLm of the main hole 14 at the outlet downstream of the main hole 14. That is, in the downstream of the outlet of the main hole 14, the central portion BLc of the velocity boundary layer BL of the working airflow approaches the mainstream of the assisting airflow blown out from the auxiliary hole 22.

Thereby, in the blowing unit 10 of the present embodiment, the mainstream AFs of the support airflow blown out from the auxiliary hole 22 flows in a state of approaching the central portion BLc of the thickness δ of the velocity boundary layer BL. That is, as shown in FIG. 18, the main flow AFs of the support airflow flows near the vortex center of the transverse vortex Vt generated in the velocity boundary layer BL. The effect of suppressing the development of the lateral vortex Vt generated in the velocity boundary layer BL is easily obtained. In the present embodiment, the main inclined structure 32 provided on the inner wall surface 141 of the main hole 14 functions as a vortex suppressing structure.

In the air blowing device 1 of the present embodiment described above, the main inclined structure 32 is provided on the inner wall surface 141 that forms the main hole 14. According to this, the velocity boundary layer BL formed on the downstream side of the main hole 14 by spreading the flow velocity distribution in the vicinity of the inner wall surface 141 of the main hole 14 to the support airflow from the auxiliary hole 22 on the downstream side of the main hole 14. The central portion BLc of the thickness δ can be made closer to the air flow blown out from the auxiliary hole 22. For this reason, the development of the lateral vortex Vt in the velocity boundary layer BL is sufficiently suppressed by the air flow blown out from the auxiliary hole 22.

As described above, also by the air blowing device 1 of the present embodiment, the drawing of air from the surroundings into the airflow blown out from the main hole 14 is suppressed, and the flow velocity of the airflow blown out from the main hole 14 is less attenuated. Therefore, the reach of the working air current blown out from the main hole 14 is increased. In the present embodiment, the main inclined structure 32 functions as a separation structure for separating the velocity boundary layer BL of the working airflow from the central portion of the working airflow.

(Modification of the fourth embodiment)
In the above-described fourth embodiment, the inner wall surface 141 of the main hole 14 is inclined so that the tangent line TLm extending along the inner wall surface 141 intersects the center line CLm of the main hole 14 on the entire circumference. Although illustrated, it is not limited to this. For example, the air blowing device 1 has a structure in which a part of the inner wall surface 141 of the main hole 14 is inclined so that a tangent line TLm extending along the inner wall surface 141 intersects the center line CLm of the main hole 14. Good.

In the fourth embodiment described above, the inner wall surface 141 of the main hole 14 is illustrated as extending linearly, but is not limited thereto. The inner wall surface 141 of the main hole 14 may extend in a curved shape. In this case, the tangent TLm is a tangent at the downstream end of the inner wall surface 141 of the main hole 14.

In the above-described fourth embodiment, the main inclined structure 32 is applied to the main hole 14, and the enlarged portion 180, the contracted fin 28, and the uneven portion 30 described in the first to third embodiments are not applied. However, the present invention is not limited to this. For example, in the blowout unit 10 in which the main inclined structure 32 is applied to the main hole 14, the air blowing device 1 includes the expansion unit 180, the contraction fin 28, and the concavo-convex unit 30 described in the first to third embodiments. At least one layer reduction structure may be applied.

(Fifth embodiment)
Next, a fifth embodiment will be described with reference to FIGS. The present embodiment is different from the first embodiment in that the auxiliary hole 22 is not provided in the hole forming portion 12. In the present embodiment, portions different from those in the first embodiment will be mainly described, and description of portions similar to those in the first embodiment may be omitted.

As shown in FIG. 19, the air blowing device 1 includes a blowing unit 10 that blows out an air flow. The blowout unit 10 includes a hole forming unit 12 that forms a main hole 14 that blows out an airflow that is a working airflow, a duct unit 16 that forms a main flow path 18 that allows the airflow blown out from the main hole 14, and an outside of the duct unit 16. It is configured including the provided flange portion 20.

Similar to the first embodiment, an oval main hole 14 is opened as a single hole in the hole forming portion 12, and the hole forming portion 12 includes a plurality of holes unlike the first embodiment. The auxiliary hole 22 is not formed.

The duct part 16 is a cylindrical member. Inside the duct portion 16, a main flow path 18 is formed in the central portion for allowing the working air current blown from the main hole 14 to pass therethrough. Specifically, the duct portion 16 is configured by a flat cylindrical member in which the cross-sectional area of the main flow path 18 is substantially constant. In the duct portion 16 of the present embodiment, the cross-sectional area of the main flow path 18 and the opening area of the main hole 14 are approximately the same size.

The present inventors consider that it is effective that the central portion of the working airflow is separated from the velocity boundary layer BL in order to increase the reach of the working airflow, and the speed of the working airflow with respect to the blowing portion 10 The separation structure 50 for separating the boundary layer BL from the central portion of the working airflow is added.

The blow-out unit 10 is provided with a structure 51 that contracts the airflow flowing through the main flow path 18 as the separation structure 50. Although not shown, the structure 51 extends along the long side of the inner wall surface 141 of the main hole 14 at a substantially central portion of the short side of the inner wall surface 141 of the main hole 14 so that the main flow path 18 is divided vertically. Yes. The structure 51 is connected to the inside of the duct portion 16 at both ends in the longitudinal direction.

The structure 51 has a streamlined cross section along the flow direction of the airflow flowing through the main flow path 18. Specifically, the structure 51 has a teardrop shape with excellent aerodynamic characteristics. That is, in the structure 51, the upstream end 511 on the upstream side of the air flow has a rounded curved shape, and the downstream end 512 located on the downstream side of the air flow has a sharp curved shape as compared with the upstream end 511. It has become. In the structure 51, the upstream end 511 constitutes a front edge portion, and the downstream end 512 constitutes a rear edge portion.

Further, the thickness of the cross section of the structure 51 is maximum at a position closer to the front edge portion than to the rear edge portion. The thickness of the cross section of the structure 51 is set so that the thickness δ of the velocity boundary layer BL formed along the inner wall surface 141 of the main hole 14 is small. The structure 51 of the present embodiment has an optimal shape in order to make the working airflow blown from the main hole 14 have a top-hat type wind speed distribution. That is, the structure 51 is configured such that the flow channel cross-sectional area on the downstream side of the main flow channel 18 is about 1/10 of that on the upstream side. Specifically, in the structure 51, the shortest distance Lf2 from the inner wall surface of the main hole 14 to the structure 51 and the distance Lf1 from the inner wall surface 141 of the main hole 14 to the center line of the main hole 14 are 1: 3. It is desirable that the thickness of the cross section is set to be 3 or more. In the present embodiment, the structure 51 forms a layer reduction structure that reduces the thickness δ of the velocity boundary layer BL formed along the inner wall surface 141 of the main hole 14.

In addition, the structure 51 is positioned at a site that forms the main flow path 18 inside the duct portion 16 so as not to protrude from the main hole 14. Specifically, in the structure 51, the downstream end 512 located on the downstream side in the airflow direction is positioned inside the main hole 14.

In the blowing unit 10 configured as described above, as shown in FIG. 20, when the conditioned air whose temperature is adjusted by the air conditioning unit flows into the duct unit 16, the conditioned air is directed toward the main hole 14 via the main flow path 18. Flowing.

The airflow flowing through the main flow path 18 is bifurcated by the structure 51, so that contraction occurs until the main hole 14 is reached. Thereby, in the main flow path 18, the difference in flow velocity between the vicinity of the center line CLm of the main hole 14 and the vicinity of the inner wall surface 181 forming the main flow path 18 becomes sufficiently small.

As described above, the structure 51 is positioned inside the duct portion 16 so as not to protrude from the main hole 14. For this reason, inside the duct portion 16, the upstream section A in which the channel cross-sectional area is reduced by the structure 51, the intermediate section B in which the channel cross-sectional area is larger than the upstream section A, and the channel cross-sectional area hardly change. A downstream section C is formed.

In the upstream section A, the flow path difference between the vicinity of the center line CLm of the main hole 14 and the vicinity of the inner wall surface 181 that forms the main flow path 18 is obtained by reducing the cross-sectional area of the flow path by the structure 51 and compressing the airflow. Is sufficiently small. That is, in the upstream section A, the thickness δ of the velocity boundary layer BL in the vicinity of the inner wall surface 181 forming the main flow path 18 is reduced toward the downstream side due to the contraction effect by the structure 51.

Specifically, in the intermediate section B, the flow path cross-sectional area is enlarged, so that the thickness δ of the velocity boundary layer BL near the inner wall surface 181 forming the main flow path 18 gradually increases toward the downstream side. However, in the structure 51, the amount of change in the thickness of the cross section on the rear edge side on the downstream side of the air flow is smaller than that on the front edge side. For this reason, the change in the channel cross-sectional area in the intermediate section B becomes gentler than the change in the upstream section A, and the increase amount of the thickness δ of the speed boundary layer BL in the intermediate section B is the speed boundary layer BL in the upstream section A. This is sufficiently smaller than the reduction amount of the thickness δ.
In the downstream section C, since the cross-sectional area of the flow path is constant, the thickness δ of the velocity boundary layer BL in the vicinity of the inner wall surface 181 that forms the main flow path 18 is slightly increased toward the downstream side. However, the increase amount of the thickness δ of the velocity boundary layer BL in the downstream section C is extremely smaller than the decrease amount of the thickness δ of the velocity boundary layer BL in the upstream section A.

Thus, the amount of decrease in the thickness δ of the velocity boundary layer BL in the upstream section A by the structure 51 is sufficiently larger than the increase in the thickness δ of the velocity boundary layer BL in the intermediate section B and the downstream section C.

When the airflow is blown out from the main hole 14, the velocity boundary layer BL of the working airflow is formed along the inner wall surface 141 of the main hole 14 downstream of the outlet of the main hole 14. The thickness δ of the velocity boundary layer BL is reduced by the contracted flow in the main flow path 18.

If the thickness δ of the velocity boundary layer BL of the working airflow formed downstream of the main hole 14 is small, the central portion BLc of the thickness δ of the velocity boundary layer BL is the center line of the main hole 14 downstream of the main hole 14 outlet. It will be in the state away from CLm. Specifically, the interval LS between the central portion BLc of the thickness δ of the velocity boundary layer BL of the working airflow and the center line CLm of the main hole 14 is increased. In this case, since the main flow of the working air flow is separated from the vortex center of the transverse vortex Vt generated in the velocity boundary layer BL, the attenuation of the flow velocity in the central portion of the working air flow is reduced, and the reach of the working air flow blown out from the main hole 14 It can be made longer.

The air blowing device 1 described above is provided with the separation structure 50 for separating the central portion BLc of the thickness δ of the velocity boundary layer BL of the working air flow from the center line CLm of the main hole 14 downstream of the outlet of the main hole 14. . According to this, the attenuation of the flow velocity at the central portion of the working airflow is reduced, and the reach distance of the working airflow blown out from the main hole 14 can be increased.

Particularly, in the air blowing device 1 of the present embodiment, a structure 51 is provided as a separation structure 50 with respect to the main flow path 18. As described above, when the structure 51 is provided for the main flow path 18, the flow velocity difference between the vicinity of the center line CLm of the main hole 14 and the vicinity of the inner wall surface is reduced due to the contracted flow generated in the main flow path 18. The thickness δ of the velocity boundary layer BL can be reduced.

Thus, if the thickness δ of the velocity boundary layer BL is reduced, the working airflow formed downstream from the outlet of the main hole 14 tends to have a top-hat type wind speed distribution. In the top-hat type wind speed distribution, the central portion of the thickness δ of the velocity boundary layer BL of the working airflow formed downstream of the outlet of the main hole 14 is greatly separated from the center line CLm of the main hole 14. For this reason, it is possible to sufficiently suppress the attenuation of the flow velocity at the central portion of the working air flow and to increase the reach distance of the working air current.

The structure 51 has a streamlined cross-sectional shape along the flow direction of the airflow flowing through the main flow path 18. As described above, when the structure 51 has a streamline shape, separation of the air flow on the surface of the structure 51 accompanying the arrangement of the structure 51 is suppressed, and turbulence can be sufficiently suppressed. This is effective in increasing the reach of the working airflow.

Further, the structure 51 is disposed on the inner wall surface 181 that forms the main flow path 18 so that the downstream end portion 512 located on the downstream side in the flow direction of the airflow flowing through the main flow path 18 does not protrude from the main hole 14. Has been. According to this, since the airflow blown out from the main hole 14 is not disturbed by the structure 51, the attenuation of the flow velocity at the central portion of the working airflow can be sufficiently suppressed.

(Modification of the fifth embodiment)
In the above-described fifth embodiment, the structure 51 is exemplified as one having a streamlined cross-sectional shape, but is not limited to this. The structure 51 may have, for example, an oval shape whose cross-sectional shape extends along the airflow in the main flow path 18. Moreover, as the structure 51, what has a grid | lattice shape may be employ | adopted, for example.

In the above-described fifth embodiment, the example in which the structure 51 is disposed on the inner wall surface 181 that forms the main flow path 18 so as not to protrude outside from the main hole 14 has been described, but the present invention is not limited thereto. The structure 51 may be arrange | positioned at the main flow path 18 so that the downstream edge part 512 may protrude outside from the main hole 14, for example.

(Sixth embodiment)
Next, a sixth embodiment will be described with reference to FIGS. The present embodiment is different from the fifth embodiment in that the uneven portion 52 is provided on the inner wall surface 181 that forms the main flow path 18. In the present embodiment, portions that are different from the fifth embodiment will be mainly described, and description of portions that are the same as those of the fifth embodiment may be omitted.

As shown in FIG. 21, in the blowing portion 10 of the present embodiment, concave portions and convex portions are alternately arranged along the flow direction of the air flow in the main flow path 18 with respect to the inner wall surface 181 that forms the main flow path 18. An uneven portion 52 is provided. Specifically, the concavo-convex portion 52 is formed in substantially the entire area of the inner wall surface 181 that forms the main flow path 18 inside the duct portion 16. In addition, the uneven | corrugated | grooved part 52 of this embodiment is formed similarly to the uneven | corrugated | grooved part 30 demonstrated in 3rd Embodiment.

In the blowing unit 10 configured as described above, as shown in FIG. 22, when the conditioned air whose temperature is adjusted by the air conditioning unit flows into the duct unit 16, the conditioned air is directed toward the main hole 14 via the main flow path 18. Flowing.

On the inner wall surface 181 of the duct portion 16 that forms the main flow path 18, a concavo-convex portion 52 in which concave and convex portions are alternately arranged in the main flow direction in the main flow path 18 is formed. In the concavo-convex portion 52, vortices are generated in the plurality of grooves when the airflow passes near the inner wall surface 181 forming the main flow path 18. And the vortex which arises inside the uneven | corrugated | grooved part 52 plays a role like a ball bearing, and the friction coefficient of the inner wall surface 181 which forms the main flow path 18 becomes small. Thereby, in the main flow path 18, the flow velocity difference between the vicinity of the center line CLm of the main hole 14 and the vicinity of the inner wall surface 181 forming the main flow path 18 is reduced.

Then, when the airflow is blown out from the main hole 14 and the auxiliary hole 22, the velocity boundary layer BL of the working airflow is formed along the inner wall surface 141 of the main hole 14 downstream of the outlet of the main hole 14. The thickness δ of the velocity boundary layer BL is reduced by the effect of reducing the friction coefficient by the uneven portion 52. That is, the central part BLc of the thickness δ of the velocity boundary layer BL of the working airflow is in a state of being separated from the center line CLm of the main hole 14 downstream of the main hole 14. Specifically, the interval LS between the central portion BLc of the thickness δ of the velocity boundary layer BL of the working airflow and the center line CLm of the main hole 14 is increased. In the present embodiment, the uneven portion 52 provided in the main flow path 18 functions as the separation structure 50 and the layer reduction structure.

In the air blowing device 1 described above, since the uneven portion 52 is added to the inner wall surface 181 that forms the main flow path 18, a speed boundary is achieved by the effect of reducing the friction coefficient of the inner wall surface 181 that forms the main flow path 18. The thickness δ of the layer BL can be made sufficiently small. For this reason, the attenuation of the flow velocity in the central portion of the working airflow is reduced, and the reach distance of the working airflow blown out from the main hole 14 can be increased.

(Modification of the sixth embodiment)
In the above-described sixth embodiment, the concavo-convex portion 52 is illustrated as being formed by a plurality of grooves, but is not limited thereto. The concavo-convex portion 52 may be formed by a plurality of protrusions, for example.

In the above-described sixth embodiment, the concavo-convex portion 52 is illustrated as being formed on substantially the entire inner wall surface 181 that forms the main flow path 18 inside the duct portion 16, but is not limited thereto. The uneven portion 52 may be formed on a part of the inner wall surface 181 that forms the main flow path 18.

In the above-described sixth embodiment, the structure including the concavo-convex portion 52 is exemplified as the layer reduction structure, but the present invention is not limited to this. The layer contraction structure may be a structure including the structure 51 and the concavo-convex portion 52, for example.

(Seventh embodiment)
Next, a seventh embodiment will be described with reference to FIGS. This embodiment is different from the fifth embodiment in that the vicinity of the main hole 14 is expanded in a trumpet shape. In the present embodiment, portions that are different from the fifth embodiment will be mainly described, and description of portions that are the same as those of the fifth embodiment may be omitted.

As shown in FIG. 23, the blowout portion 10 of the present embodiment has a main hole 14 and its vicinity expanded in a trumpet shape. Specifically, the main hole 14 is enlarged so that the inner wall surface 141 thereof is separated from the center line CLm of the main hole 14 toward the downstream side in the airflow direction.

If the vicinity of the main hole 14 is extremely widened, the air current may be peeled off from the wall surface, and the turbulence may increase. For this reason, it is desirable for the main hole 14 to have an angle θs formed by the center line CLm and the tangent TLm of the inner wall surface 141 set to, for example, 7 ° or less.

As shown in FIG. 24, in the blowout section 10 configured as described above, when the conditioned air whose temperature is adjusted by the air conditioning unit flows into the duct section 16, the conditioned air is directed toward the main hole 14 via the main flow path 18. Flowing. The airflow flowing into the main flow path 18 is blown out from the main hole 14. At this time, since the main hole 14 is expanded in a trumpet shape, the velocity boundary layer BL of the working airflow is separated from the center line CLm of the main hole 14 at the downstream of the outlet of the main hole 14. Specifically, the interval LS between the central portion BLc of the thickness δ of the velocity boundary layer BL of the working airflow and the center line CLm of the main hole 14 is increased. In the present embodiment, the expanded shape of the inner wall surface 141 of the main hole 14 functions as the separation structure 50.

In the air blowing device 1 described above, since the main hole 14 is expanded in a trumpet shape, the velocity boundary layer BL of the working airflow formed downstream from the outlet of the main hole 14 is also separated from the center line CLm of the main hole 14. It becomes easy. According to this, the attenuation of the flow velocity at the central portion of the working airflow is reduced, and the reach distance of the working airflow blown out from the main hole 14 can be increased.

(Modification of the seventh embodiment)
In the above-described seventh embodiment, the structure in which the inner wall surface 141 of the main hole 14 is expanded as the separation structure 50 is illustrated, but is not limited thereto. For example, the separation structure 50 may have a structure in which at least one of the structure 51 and the uneven portion 52 is added to the structure in which the inner wall surface 141 of the main hole 14 is expanded.

(Eighth embodiment)
Next, an eighth embodiment will be described with reference to FIGS. This embodiment is different from the fifth embodiment in that an enlarged portion 180 is provided for the main flow path 18. In the present embodiment, portions that are different from the fifth embodiment will be mainly described, and description of portions that are the same as those of the fifth embodiment may be omitted.

As shown in FIG. 25, the blowing portion 10 is provided with not only the structure 51 but also an enlarged portion 180 having a cross-sectional area Sc larger than the opening area Sm of the main hole 14 with respect to the main flow path 18 as the separation structure 50. ing. Specifically, the main channel 18 has the largest cross-sectional area on the upstream side of the air flow from the structure 51, and has the smallest cross-sectional area at the place where the structure 51 is disposed. The blow-out unit 10 is configured so that, for example, the cross-sectional area is about one-tenth compared with the upstream side of the structure 51 at the place where the structure 51 is disposed. Specifically, the blowout portion 10 has a cross-sectional thickness set so that the inner diameter Ld2 and the inner diameter Ld1 on the upstream side are 1: 3.3 or more at the place where the structure 51 is disposed.

Moreover, the blowout part 10 of this embodiment has the main hole 14 vicinity expanded in the trumpet shape. Specifically, the main hole 14 is enlarged so that the inner wall surface 141 thereof is separated from the center line CLm of the main hole 14 toward the downstream side in the airflow direction. In the present embodiment, the structure 51, the enlarged portion 180, and the expanded shape of the inner wall surface 141 of the main hole 14 function as the separation structure 50. In the present embodiment, the structure 51 and the enlarged portion 180 function as a layer reduction structure.

In the blowing unit 10 configured as described above, as shown in FIG. 26, when the conditioned air whose temperature is adjusted by the air conditioning unit flows into the duct portion 16, the conditioned air is directed toward the main hole 14 via the main flow path 18. Flowing.

Since the main channel 18 is provided with the enlarged portion 180 having a larger cross-sectional area than the opening area of the main hole 14, a contracted flow occurs from the enlarged portion 180 to the main hole 14. Thereby, in the main flow path 18, the flow velocity difference between the vicinity of the center line CLm of the main hole 14 and the vicinity of the inner wall surface 181 forming the main flow path 18 is reduced. In addition, since the structure 51 is disposed in the main flow path 18, a contracted flow is also generated by the structure 51. Thereby, in the main flow path 18, the difference in flow velocity between the vicinity of the center line CLm of the main hole 14 and the vicinity of the inner wall surface 181 forming the main flow path 18 becomes sufficiently small.

Then, the airflow flowing into the main flow path 18 is blown out from the main hole 14. At this time, since the main hole 14 is expanded in a trumpet shape, a velocity boundary layer BL of the working airflow is formed downstream from the center line CLm of the main hole 14 at the outlet downstream of the main hole 14. Specifically, the interval LS between the central portion BLc of the thickness δ of the velocity boundary layer BL of the working airflow and the center line CLm of the main hole 14 is increased.

Since the air blowing device 1 described above has a structure in which the layer contraction structure includes not only the structure 51 but also the enlarged portion 180, the thickness δ of the velocity boundary layer BL due to contraction is reduced. Further, since the main hole 14 is expanded in a trumpet shape, the velocity boundary layer BL of the working airflow formed downstream from the outlet of the main hole 14 is also easily separated from the center line CLm of the main hole 14. Accordingly, it is possible to increase the reach distance of the working air current blown out from the main hole 14.

(Ninth embodiment)
Next, a ninth embodiment will be described with reference to FIGS. The present embodiment is different from the eighth embodiment in that a vertical vortex generating mechanism 53 is provided for the upstream end 511 of the structure 51. In the present embodiment, portions different from those in the eighth embodiment will be mainly described, and descriptions of portions similar to those in the eighth embodiment may be omitted.

27 and 28, the structure 51 is provided with an uneven vertical vortex generating mechanism 53 at the upstream end 511. The vertical vortex generating mechanism 53 generates a vertical vortex near the upstream end 511 of the structure 51. The vertical vortex is a spiral vortex in which the vortex core is oriented in the same direction as the main flow direction.

The vertical vortex generating mechanism 53 is composed of a plurality of concave and convex protrusions protruding from the upstream end 511. Specifically, the vertical vortex generating mechanism 53 is configured by a plurality of triangular projecting pieces formed at the upstream end 511. The protruding piece has a sharpened shape by linearly intersecting two sides extending toward the tip.

As shown in FIG. 29, in the blowout section 10 configured as described above, when the conditioned air whose temperature is adjusted by the air conditioning unit flows into the duct section 16, the conditioned air is directed toward the main hole 14 via the main flow path 18. Flowing. Since the structure 51 is disposed in the main flow path 18, a contracted flow is generated by the structure 51, but there is a possibility that the airflow flowing around the structure 51 may be separated from the structure 51 and disturbed. is there.

On the other hand, in the present embodiment, since the vertical vortex generating mechanism 53 is provided at the upstream end 511 of the structure 51, when the airflow passes near the upstream end 511 of the structure 51, the vertical vortex generating mechanism 53 is provided. A vortex is generated. The vertical vortex generated by the vertical vortex generating mechanism 53 is a spiral vortex whose vortex core is directed in the same direction as the airflow flowing around the structure 51, and includes a velocity component toward the surface of the structure 51. . For this reason, the airflow that flows around the structure 51 is easily pushed along the surface of the structure 51 by being pushed closer to the surface of the structure 51 by the vertical vortex generated by the vertical vortex generating mechanism 53. Become.

Other configurations are the same as those in the eighth embodiment. Since the air blowing device 1 of the present embodiment has the same configuration as that of the eighth embodiment, the effects obtained from the common configuration can be obtained similarly to the eighth embodiment.

In particular, in the air blowing device 1 of the present embodiment, the vertical vortex generating mechanism 53 is provided at the upstream end 511 of the structure 51, so that the airflow flowing around the structure 51 flows into the vertical vortex generating mechanism 53. The vertical vortex generated in this way makes it easier to flow along the surface of the structure. As a result, the turbulence of the working air flow accompanying the addition of the structure 51 can be sufficiently suppressed.

(Modification of the ninth embodiment)
In the above-described ninth embodiment, the structure 51 of the air blowing device 1 described in the eighth embodiment is provided with the vertical vortex generating mechanism 53. However, the present invention is not limited to this. The longitudinal vortex generating mechanism 53 may be added to the structure 51 described in the seventh embodiment, for example. Further, the longitudinal vortex generating mechanism 53 may be added to the contracted fin 28 described in the second embodiment, for example.

(10th Embodiment)
Next, a tenth embodiment will be described with reference to FIG. This embodiment is different from the sixth embodiment in that an enlarged portion 180 is provided for the main flow path 18. In the present embodiment, portions that are different from the sixth embodiment will be mainly described, and description of portions that are the same as the sixth embodiment may be omitted.

As shown in FIG. 30, the blowout portion 10 is provided with not only the uneven portion 52 but also an enlarged portion 180 having a cross-sectional area Sc larger than the opening area Sm of the main hole 14 with respect to the main flow path 18 as the separation structure 50. ing. Specifically, the main flow path 18 has the largest cross-sectional area on the upstream side of the air flow, and has the smallest cross-sectional area in the vicinity of the main hole 14. The blow-out part 10 is configured so that, for example, the opening area of the main hole 14 is about 1/10 compared to the upstream side. Specifically, the blow-out portion 10 has a cross-sectional thickness set such that the inner diameter Ld2 of the main hole 14 and the inner diameter Ld1 on the upstream side are 1: 3.3 or more. In the present embodiment, the uneven portion 52 and the enlarged portion 180 function as the separation structure 50 and the layer reduction structure.

In the blowing unit 10 configured as described above, as shown in FIG. 30, when the conditioned air whose temperature is adjusted by the air conditioning unit flows into the duct portion 16, the conditioned air is directed toward the main hole 14 via the main flow path 18. Flowing. At this time, the vortex generated inside the concavo-convex portion 52 when the airflow passes in the vicinity of the inner wall surface 181 that forms the main flow path 18 plays a role like a ball bearing, so that the inner wall surface 181 that forms the main flow path 18 The coefficient of friction is reduced. Thereby, in the main flow path 18, the flow velocity difference between the vicinity of the center line CLm of the main hole 14 and the vicinity of the inner wall surface 181 forming the main flow path 18 is reduced.

In addition, the main flow path 18 is provided with an enlarged portion 180 having a cross-sectional area larger than the opening area of the main hole 14, so that contraction occurs from the enlarged portion 180 to the main hole 14. Thereby, in the main flow path 18, the difference in flow velocity between the vicinity of the center line CLm of the main hole 14 and the vicinity of the inner wall surface 181 forming the main flow path 18 becomes sufficiently small. The airflow flowing into the main flow path 18 is blown out from the main hole 14. At this time, a velocity boundary layer BL of the working airflow is formed downstream from the outlet of the main hole 14 so as to be separated from the center line CLm of the main hole 14.

Since the air blowing device 1 described above has a structure in which the layer contraction structure includes not only the concavo-convex part 52 but also the enlarged part 180, the thickness δ of the velocity boundary layer BL due to contraction is reduced. As a result, the velocity boundary layer BL of the working airflow formed downstream from the outlet of the main hole 14 is also easily separated from the center line CLm of the main hole 14, so that the reach of the working airflow blown out from the main hole 14 is increased. Is possible.

(Eleventh embodiment)
Next, an eleventh embodiment will be described with reference to FIGS. 31 and 32. This embodiment is different from the fifth embodiment in that a contracted flow shape portion 183 is provided in the duct portion 16. In the present embodiment, portions that are different from the fifth embodiment will be mainly described, and description of portions that are the same as those of the fifth embodiment may be omitted.

As shown in FIG. 31, in the blowing unit 10, the cross-sectional area of the main flow path 18 is reduced from the upstream side to the downstream side in the airflow direction. Specifically, an upstream flat portion 182, a contracted flow shape portion 183, and a downstream flat portion 184 are set on the inner wall surface 181 that forms the main flow path 18.

The upstream flat portion 182 is configured by a portion on the upstream side of the air flow in the inner wall surface 181 that forms the main flow path 18. The upstream flat portion 182 has a flat shape along the airflow direction so that the cross-sectional area is substantially constant.

The downstream flat portion 184 is configured of a portion on the downstream side of the air flow in the inner wall surface 181 that forms the main flow path 18. The downstream flat portion 184 has a flat shape along the airflow direction so that the cross-sectional area is substantially constant. The downstream flat portion 184 is configured so that its cross-sectional area is about 1/10 of the cross-sectional area of the upstream flat portion 182.

The contracted flow shape portion 183 corresponds to the enlarged portion 180 described in the eighth embodiment. The contracted flow shape portion 183 is a connection portion that connects the upstream flat portion 182 and the downstream flat portion 184. The contracted flow shape portion 183 is a portion that reduces the cross-sectional area of the main flow path 18 from the upstream side to the downstream side in the airflow direction.

In the contracted flow shape portion 183, the upstream end 183a located upstream in the airflow direction is connected to the upstream flat portion 182 and the downstream end 183b located downstream in the airflow direction is connected to the downstream flat portion 184. ing. The contracted flow shape portion 183 has a shape in which the upstream end 183a and the downstream end 183b are along the flow direction of the airflow so that the connection portion between the upstream flat portion 182 and the downstream flat portion 184 is a continuous curved surface having no step. It has become.

The size of the structure 51 in the flow direction of the airflow is smaller than the length of the contracted flow shape section where the contracted flow shape portion 183 is set in the inner wall surface 181 forming the main flow path 18. The structure 51 is disposed in the main flow path 18 so as to be contained in the contracted flow shape section of the inner wall surface 181 that forms the main flow path 18. That is, in the structure 51, the upstream end 511 located on the upstream side in the airflow direction is positioned on the downstream side of the upstream end 183a of the contracted flow shape portion 183. In addition, in the structure 51, the downstream end portion 512 located on the downstream side in the airflow direction is positioned on the upstream side of the downstream end 183 b of the contracted flow shape portion 183.

In the blowout unit 10 configured in this manner, when the conditioned air whose temperature is adjusted by the air conditioning unit flows into the duct unit 16, the conditioned air flows toward the main hole 14 through the main flow path 18. In the main channel 18, the structure 51 is arranged, and a contracted flow shape portion 183 is provided on the inner wall surface 181 that forms the main channel 18. For this reason, in the main flow path 18, the difference in flow velocity between the vicinity of the center line CLm of the main hole 14 and the vicinity of the inner wall surface 181 forming the main flow path 18 is sufficiently small.

Here, as shown in FIG. 32, in the vicinity of the downstream end portion 512 of the structure 51 in the main flow path 18, the structure 51 provides a concave wind speed distribution Ws1. That is, in the vicinity of the downstream end portion 512 of the structure 51 in the main flow path 18, the vicinity of the inner wall surface 181 of the main flow path 18 compared to the central portion of the main flow path 18 due to the contraction effect by the structure 51 and the contracted flow shape portion 183. The flow velocity of becomes larger. If the airflow is blown out from the main hole 14 with such a concave wind speed distribution Ws1, the core portion of the airflow blown out from the main hole 14 may be quickly collapsed.

In contrast, in the present embodiment, the downstream end 512 of the structure 51 is positioned upstream of the downstream end 183b of the contracted flow portion 183. According to this, the contracted flow is generated by the contracted flow shape portion 183 even on the downstream side of the structure 51, so that the airflow easily flows downstream of the place where the structure 51 is disposed. Thereby, the flow velocity once reduced at the place where the structure 51 is disposed can be recovered downstream. That is, the working airflow formed downstream from the outlet of the main hole 14 tends to be a top-hat type wind speed distribution Ws2.

Since the air blowing device 1 described above has a structure in which the layer contraction structure includes not only the structure 51 but also the enlarged portion 180, the thickness δ of the velocity boundary layer BL decreases due to the contraction. Since the downstream end portion 512 of the structure 51 is positioned on the upstream side of the downstream end 183b of the contracted flow shape portion 183, the working airflow formed downstream from the outlet of the main hole 14 has a top-hat type wind speed distribution. It becomes easy. Accordingly, it is possible to increase the reach distance of the working air current blown out from the main hole 14.

(Modification of the eleventh embodiment)
In the eleventh embodiment described above, the structure 51 is exemplified so that the structure 51 is disposed so as to be accommodated in the contracted flow shape section of the inner wall surface 181 that forms the main flow path 18, but is not limited thereto.

For example, as shown in the first modification of FIG. 33, the structure 51 is configured such that the downstream end 512 is positioned upstream of the downstream end 183b of the contracted flow shape portion 183 and the upstream end 511 is contracted. The shape portion 183 may be positioned on the upstream side of the upstream end 183a. According to this, the same effect as the eleventh embodiment can be obtained.

In the structure 51, for example, as shown in the second modification of FIG. 34, the upstream end 511 is positioned on the downstream side of the upstream end 183a of the contracted flow portion 183, and the downstream end 512 is It may be positioned on the downstream side of the downstream end 183b of the contracted flow shape portion 183.

In the eleventh embodiment described above, the inner wall surface 181 forming the main flow path 18 is exemplified by the upstream flat portion 182, the contracted flow shape portion 183, and the downstream flat portion 184 being set. It is not limited. As long as the reduced flow shape portion 183 is set on the inner wall surface 181 forming the main flow path 18, the upstream flat portion 182 and the downstream flat portion 184 do not need to be set in the blowing portion 10. Moreover, as for the blowing part 10, the downstream of the contracted flow shape part 183 may be expanded in the trumpet shape.
(Other embodiments)
As mentioned above, although typical embodiment of this indication was described, this indication is not limited to the above-mentioned embodiment, for example, can be variously changed as follows.

In the above-described embodiment, the example in which one main hole 14 is formed in the hole forming portion 12 has been described, but the present invention is not limited to this. The air blowing device 1 may have a structure in which a plurality of main holes 14 are formed in the hole forming portion 12. In this case, for example, the plurality of auxiliary holes 22 are arranged so as to surround the plurality of main holes 14 as a single hole group, or to surround each of the plurality of main holes 14. That's fine.

In the above-described embodiment, the example in which the auxiliary hole 22 is configured by a plurality of round holes has been described, but the present invention is not limited to this. The auxiliary hole 22 may be configured by, for example, a curved slit hole surrounding the main hole 14. In this case, the auxiliary hole 22 is not limited to a plurality of slit holes, and can be constituted by a single slit hole.

In the above-described embodiment, the main flow path 18 and the auxiliary flow path 24 are formed inside the single duct portion 16, but the present invention is not limited to this. In the air blowing device 1, for example, a portion that forms the main flow path 18 and a portion that forms the auxiliary flow path 24 in the duct portion 16 may be configured separately.

In the above-described embodiment, the blowout portion 10 having the flange portion 20 is exemplified, but the present invention is not limited to this. The blow-out part 10 may have a configuration in which, for example, the hole forming part 12 and the duct part 16 are included and the flange part 20 is not included.

In the above-described embodiment, an example in which the air blowing device 1 of the present disclosure is applied to the air blowing port of an air conditioning unit that air-conditions the vehicle interior is illustrated, but the present invention is not limited to this. The air blowing device 1 according to the present disclosure is not limited to a moving body such as a vehicle, but can be widely applied to an air blowing port of an installation type air conditioning unit for home use or the like. The air blowing device 1 of the present disclosure is not limited to an air conditioning unit that air-conditions a room. For example, a temperature control that blows out temperature-controlled air that adjusts the temperature of an air outlet of a humidifying device that humidifies the room, a heating element, or the like. It can also be applied to the air outlet of equipment.

In the above-described embodiment, it is needless to say that elements constituting the embodiment are not necessarily indispensable except for the case where it is clearly indicated that the element is essential and the case where the element is clearly considered to be essential in principle.

In the above-described embodiment, when numerical values such as the number, numerical value, quantity, range, etc. of the constituent elements of the embodiment are mentioned, it is particularly limited to a specific number when clearly indicated as essential and in principle. Except in some cases, the number is not limited.

In the above embodiment, when referring to the shape, positional relationship, etc. of the component, etc., the shape, positional relationship, etc. unless otherwise specified and in principle limited to a specific shape, positional relationship, etc. It is not limited to etc.

(Summary)

According to the first aspect shown in a part or all of the above-described embodiment, the air blowing device includes a blowing unit that blows out an air flow. The blow-out unit includes at least one main hole for blowing out an air flow as a working air flow, and a separation structure for separating the central portion of the speed boundary layer of the working air flow from the center line of the main hole downstream of the outlet of the main hole. It is configured to include.

According to the 2nd viewpoint, the blowing part of the air blowing apparatus contains the main flow path which allows the airflow which blows off from a main hole to pass through. The separation structure includes a layer contraction structure that reduces the thickness of the velocity boundary layer formed along the inner wall surface of the main flow path.

Thus, if the thickness of the velocity boundary layer is reduced, the working airflow formed downstream of the outlet of the main hole is likely to have a top-hat type wind speed distribution. In the top-hat type wind speed distribution, the central part of the velocity boundary layer thickness of the working airflow formed downstream from the outlet of the main hole is far away from the center line of the main hole. It is possible to sufficiently suppress the attenuation and increase the reach of the working airflow.

According to the third aspect, the air blowing device is provided with a structure that contracts the airflow flowing through the main channel as a layer contraction structure in the main channel. In this way, if the structure is provided for the main flow path, the flow velocity difference between the vicinity of the center line of the main hole and the vicinity of the inner wall surface is reduced due to the contracted flow generated in the main flow path. The thickness can be reduced. That is, it is possible to realize a structure in which the central portion of the thickness of the velocity boundary layer of the working airflow formed downstream from the outlet of the main hole is separated from the center line of the main hole.

According to the fourth aspect, in the air blowing device, a contracted flow shape portion that reduces the cross-sectional area of the main flow path from the upstream side to the downstream side in the air flow direction is formed on the inner wall surface forming the main flow path. include. In the structure, the downstream end located on the downstream side in the flow direction of the airflow flowing through the main flow path is upstream of the downstream end located on the downstream side in the flow direction of the airflow flowing through the main flow path in the contracted flow shape portion. Is positioned.

When the structure is arranged with respect to the main flow path, the flow velocity is reduced at the position where the structure is arranged in the main flow path, so that a concave wind speed distribution tends to be generated on the downstream side of the structure. If the airflow is blown out from the main hole with such a concave wind speed distribution, the core portion of the airflow blown out from the main hole may be quickly collapsed.

On the other hand, when the downstream end of the structure is positioned upstream of the downstream end of the contracted flow shape portion, the flow is generated by the contracted flow shape portion on the downstream side of the structure, so that the structure is arranged. The air flow easily flows downstream of the formed portion. According to this, since the flow velocity once lowered at the place where the structure is disposed can be recovered downstream, the working airflow formed downstream from the outlet of the main hole is likely to have a top-hat type wind velocity distribution.

According to the fifth aspect, the air blowing device has a contracted flow shape portion that reduces the flow passage cross-sectional area of the main flow passage from the upstream side to the downstream side in the air flow direction on the inner wall surface forming the main flow passage. include. In the structure, the upstream end located on the upstream side in the flow direction of the airflow flowing in the main flow path is downstream of the upstream end located on the upstream side in the flow direction of the airflow flowing in the main flow path in the contracted flow shape portion. Is positioned. As described above, when the upstream end of the structure is positioned downstream of the upstream end of the contracted flow shape portion, the contraction effect by the structure and the contracted flow shape portion can be obtained.

According to the sixth aspect, the air blowing device has a contracted flow shape portion that reduces the cross-sectional area of the main flow path from the upstream side to the downstream side in the air flow direction on the inner wall surface forming the main flow path. include. In the structure, the upstream end located on the upstream side in the flow direction of the airflow flowing in the main flow path is downstream of the upstream end located on the upstream side in the flow direction of the airflow flowing in the main flow path in the contracted flow shape portion. Is positioned. Further, the structure has a downstream end located downstream in the flow direction of the airflow flowing through the main flow path, and a downstream end located downstream of the flow direction of the airflow flowing through the main flow path in the contracted flow shape portion. Located upstream.

According to the seventh aspect, the structure of the air blowing device has a streamlined cross-sectional shape along the flow direction of the airflow flowing through the main flow path. Thus, if the structure has a streamlined shape, separation of the air current on the surface of the structure is suppressed, and turbulence can be sufficiently suppressed. This is effective in increasing the reach of the working airflow.

According to the eighth aspect, the structure of the air blowing device is provided with an uneven vertical vortex generating mechanism for generating vertical vortices at the upstream end located upstream in the flow direction of the airflow flowing through the main flow path. It has been. According to this, the airflow that flows around the structure becomes easy to flow along the surface of the structure by the vertical vortex generated by the vertical vortex generation mechanism, thereby suppressing the turbulence of the working airflow accompanying the addition of the structure be able to.

According to the ninth aspect, the structure of the air blowing device is arranged on the inner side of the main flow path so that the downstream end located on the downstream side in the flow direction of the airflow flowing through the main flow path does not protrude outside from the main hole. Is arranged. According to this, since the airflow blown out from the main hole is not disturbed by the structure, the attenuation of the flow velocity at the central portion of the working airflow can be sufficiently suppressed.

According to the tenth aspect, in the air blowing device, at least a part of the main flow path is provided with a concavo-convex part in which concave parts and convex parts are alternately arranged along the flow direction of the air flow in the main flow path as a layer contraction structure. Yes. In this way, if the structure is provided with a concavo-convex portion on a part of the inner wall surface of the main flow path, the vortex generated inside the concavo-convex portion plays a role like a ball bearing, so that the friction of the inner wall surface of the main flow path The coefficient becomes smaller. For this reason, the difference in flow velocity between the vicinity of the center line of the main hole and the vicinity of the inner wall surface is reduced, and the thickness of the velocity boundary layer can be reduced. That is, it is possible to realize a structure in which the central portion of the thickness of the velocity boundary layer of the working airflow formed downstream from the outlet of the main hole is separated from the center line of the main hole.

According to the eleventh aspect, in the air blowing device, the main flow path is provided with an enlarged portion having a cross-sectional area larger than the opening area of the main hole as a layer reducing structure. Thus, if the structure is provided with an enlarged portion with respect to the main flow path, the flow velocity difference between the vicinity of the center line of the main hole and the vicinity of the inner wall surface is reduced due to the contracted flow generated in the main flow path, and the velocity boundary layer The thickness can be reduced. That is, it is possible to realize a structure in which the central portion of the thickness of the velocity boundary layer of the working airflow formed downstream from the outlet of the main hole is separated from the center line of the main hole.

According to the twelfth aspect, the air blowing device is enlarged so that the inner wall surface of the main hole is separated from the center line of the main hole toward the downstream side in the air flow direction. According to this, the velocity boundary layer of the working airflow formed downstream of the main hole according to the shape of the inner wall surface of the main hole is also easily formed so as to be separated from the center line of the main hole. For this reason, the structure which leaves | separates the center part of the thickness of the speed boundary layer of the working airflow formed downstream of the exit of a main hole from the centerline of a main hole is realizable.

Claims

An air blowing device,
It has a blowout part (10) that blows out airflow,
The blowing section is
At least one main hole (14) that blows out an airflow that is a working airflow;
A separation structure (50) for separating the central portion (BLc) of the thickness (δ) of the velocity boundary layer (BL) of the working air flow from the center line (CLm) of the main air flow downstream of the outlet of the main hole; Air blower configured to include.
The blowout part includes a main flow path (18) that allows an airflow blown from the main hole to pass therethrough,
The air blowing device according to claim 1, wherein the separation structure includes a layer contraction structure (51, 52) for reducing a thickness of a velocity boundary layer formed along an inner wall surface forming the main flow path.
The air blowing device according to claim 2, wherein the main channel is provided with a structure (51) for contracting an airflow flowing through the main channel as the layer reducing structure.
The inner wall surface (181) forming the main flow path includes a contracted flow shape portion (183) for reducing the flow path cross-sectional area of the main flow path from the upstream side to the downstream side in the airflow direction. ,
In the structure, the downstream end (512) located on the downstream side in the flow direction of the airflow flowing in the main flow path is located on the downstream side in the flow direction of the airflow flowing in the main flow path among the contracted flow shape portions. The air blowing device according to claim 3, wherein the air blowing device is positioned upstream of the downstream end (183b).
The inner wall surface (181) forming the main flow path includes a contracted flow shape portion (183) for reducing the flow path cross-sectional area of the main flow path from the upstream side to the downstream side in the airflow direction. ,
In the structure, an upstream end portion (511) located on the upstream side in the flow direction of the airflow flowing through the main flow path is located on the upstream side in the flow direction of the airflow flowing through the main flow path in the contracted flow shape portion. The air blowing device according to claim 3, wherein the air blowing device is positioned downstream of the upstream end (183a).
The inner wall surface (181) forming the main flow path includes a contracted flow shape portion (183) for reducing the flow path cross-sectional area of the main flow path from the upstream side to the downstream side in the airflow direction. ,
In the structure, an upstream end portion (511) located on the upstream side in the flow direction of the airflow flowing through the main flow path is located on the upstream side in the flow direction of the airflow flowing through the main flow path in the contracted flow shape portion. The downstream end (512) positioned downstream of the upstream end (183a) and positioned downstream in the flow direction of the airflow flowing through the main flow path includes the main flow path of the contracted flow shape section. The air blowing device according to claim 3, wherein the air blowing device is positioned upstream of a downstream end (183b) positioned downstream in the flow direction of the flowing airflow.
The air blowing device according to any one of claims 3 to 6, wherein the structure has a streamlined cross-sectional shape along a flow direction of the airflow flowing through the main flow path.
The structure is provided with an uneven vertical vortex generating mechanism (53) for generating vertical vortices at an upstream end (511) located upstream in the flow direction of the airflow flowing through the main flow path. Item 8. The air blowing device according to any one of Items 3 to 7.
The said structure is arrange | positioned inside the said main flow path so that the downstream end part (512) located in the downstream of the flow direction of the airflow which flows through the said main flow path does not protrude outside from the said main hole. Item 9. The air blowing device according to any one of Items 3 to 8.
10. At least a part of the main flow path is provided with a concavo-convex part (52) in which concave parts and convex parts are alternately arranged along the air flow direction in the main flow path as the layer reducing structure. The air blowing apparatus as described in any one of these.
The air blowing device according to any one of claims 2 to 10, wherein the main channel is provided with an enlarged portion (180) having a cross-sectional area larger than an opening area of the main hole as the layer reducing structure.
The main hole is enlarged as claimed in any one of claims 1 to 11, wherein the inner wall surface (141) of the main hole is enlarged so as to be separated from the center line of the main hole toward the downstream side in the air flow direction. The air blowing device described.