WO2021117439A1 - Air-blowing device - Google Patents

Abstract

An air-blowing device (50) comprises a duct part (51) having a flat-shaped main hole (512), the main hole forming a main flow channel (510) through which an air flow passes and blowing out an air flow, which serves as a working air flow, at a site located on a downstream side in the main flow channel. The main flow channel is divided into a pair of side channels (510A, 510B) located on both sides in a longer direction, and a center channel (510C) interposed between the pair of side channels, by a plurality of partition members (53, 54) disposed inside the duct part. In the main flow channel, a channel width of the center channel decreases as the center channel progresses from the upstream side of the air flow toward the downstream side. At least one auxiliary hole (515), which blows out a supporting air flow that suppresses the intake of air caused by the working air flow, is provided in a periphery of the main hole in the duct part.

Description

Air blower Cross-reference to related applications

This application is based on Japanese Patent Application No. 2019-225323 filed on December 13, 2019, the contents of which are incorporated herein by reference.

This disclosure relates to an air blowing device.

Conventionally, a partition plate for partitioning a main flow path having a uniform flow path width and a sub-flow path outside the main flow path is provided inside the air blowing duct, and the flow path width of the main flow path is set within a predetermined range to blow out. An air conditioner that increases the reach of airflow is known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2008-185313

The present inventors have diligently studied the factors that cause the working airflow blown out from the main hole to diffuse in order to further increase the reach of the working airflow. According to this study, it was found that the working airflow is likely to be diffused by the action of drawing in the air of the working airflow blown out from the main hole. The air drawing action is caused by the lateral vortex generated by the shearing force due to the velocity gradient of the working airflow when the working airflow is blown out from the main hole.

These have been found after diligent studies by the present inventors, and are not disclosed in Patent Document 1. Therefore, it is difficult to expect further improvement in the reachability of the working airflow with the technique described in Patent Document 1.
It is an object of the present disclosure to provide an air blowing device capable of improving the reachability of the working airflow blown from the main hole.

According to one aspect of the present disclosure, the air blower is
It is equipped with a duct portion that forms a main flow path through which the air flow passes and has a flat main hole that blows out the air flow that becomes the working air flow at a portion located on the downstream side of the main flow path.
When the size of the opening of the main hole in the main flow path in the longitudinal direction is taken as the flow path width,
The main flow path is divided into a pair of side flow paths located on both sides in the longitudinal direction and a center flow path sandwiched between the pair of side flow paths by a plurality of partition members arranged inside the duct portion, and the center flow path is divided into a center flow path. The width of the flow path is getting smaller from the upstream side to the downstream side of the air flow.
Around the main hole of the duct portion, at least one auxiliary hole for blowing out a support airflow that suppresses the drawing of air by the operating airflow is provided.

In this way, if the flow path width of the center flow path is reduced from the upstream side to the downstream side of the air flow by the plurality of partition members, the air flow can easily flow in the center flow path and the air flow can easily flow through the center flow path. The airflow to be blown out is faster than that of a pair of side flow paths.

As a result, in the center flow path, the wind speed distribution of the working airflow becomes a convex distribution having an extension in the lateral direction of the opening of the main hole, the position of the velocity boundary layer of the working airflow is separated from the center of the working airflow, and a lateral vortex is generated. It tends to occur at a position away from the center of the working air flow. Therefore, the diffusion of the working airflow blown out from the main hole is suppressed.

In addition, if the structure is such that the support airflow is blown out from the auxiliary hole provided around the main hole, the support airflow collides with the lateral vortex generated around the operating airflow downstream of the main hole and the lateral vortex is disturbed. As a result, the air drawing action itself is suppressed.

As described above, according to the air blowing device of the present disclosure, the diffusion of the working airflow is suppressed and the air drawing action itself of the working airflow is suppressed, so that the reachability of the working airflow blown from the main hole is improved. Can be planned.

Note that the reference symbols in parentheses attached to each component or the like indicate an example of the correspondence between the component or the like and the specific component or the like described in the embodiment described later.

It is a schematic block diagram of the room air-conditioning unit to which the air blowing device which concerns on 1st Embodiment is applied. It is a schematic perspective view of the air blowing device which concerns on 1st Embodiment. It is a schematic front view of the air blowing device which concerns on 1st Embodiment. FIG. 3 is a sectional view taken along line IV-IV of FIG. FIG. 3 is a sectional view taken along line VV of FIG. It is explanatory drawing for demonstrating the flow | flow of the air flow in the longitudinal direction of the air blowing device which concerns on 1st Embodiment. It is explanatory drawing for demonstrating the wind speed distribution of the working airflow blown out from the side flow path of the air blowing device which concerns on 1st Embodiment. It is explanatory drawing for demonstrating the wind speed distribution of the working airflow blown out from the center flow path of the air blowing device which concerns on 1st Embodiment. It is explanatory drawing for demonstrating the flow | flow of the airflow in the short side direction of the air blowing device which concerns on 1st Embodiment. It is a schematic perspective view of the air blowing device which concerns on 2nd Embodiment. It is a schematic front view of the air blowing device which concerns on 2nd Embodiment. It is a schematic front view of the air blowing device which becomes the modification of the 2nd Embodiment. It is a schematic vertical sectional view of the air blowing device which concerns on 3rd Embodiment. It is a schematic cross-sectional view of the air blowing device which concerns on 3rd Embodiment. It is explanatory drawing for demonstrating how the airflow flows in the longitudinal direction of the air blowing device which concerns on 3rd Embodiment. It is explanatory drawing for demonstrating the flow | flow of the airflow in the short side direction of the air blowing device which concerns on 3rd Embodiment. It is a schematic cross-sectional view which omitted the illustration of the auxiliary hole and the like in an air blowing device. Of the air blower It is a schematic vertical sectional view which omitted the illustration of auxiliary holes and the like in an air blowing device. It is explanatory drawing for demonstrating how to spread the working airflow blown out from a center flow path in a lateral direction. It is explanatory drawing for demonstrating the inclination of the vortex layer center of the lateral vortex formed around the working airflow blown out from a center flow path. It is a schematic front view of the air blowing device which concerns on 4th Embodiment. It is explanatory drawing for demonstrating the wind speed distribution of the working airflow blown out from the side flow path of the air blowing device which concerns on 4th Embodiment. It is explanatory drawing for demonstrating the wind speed distribution of the working airflow blown out from the center flow path of the air blowing device which concerns on 4th Embodiment.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following embodiments, the same reference numerals may be assigned to parts that are the same as or equivalent to those described in the preceding embodiments, and the description thereof may be omitted. Further, when only a part of the component is described in the embodiment, the component described in the preceding embodiment can be applied to the other part of the component. The following embodiments can be partially combined with each other as long as the combination does not cause any trouble, even if not explicitly stated.

(First Embodiment)
This embodiment will be described with reference to FIGS. 1 to 9. As shown in FIG. 1, the air blowing device 50 is connected to the indoor air conditioning unit 1 that air-conditions the vehicle via a duct 30.

The indoor air conditioning unit 1 is arranged inside the instrument panel located at the front of the vehicle interior. The indoor air conditioning unit 1 has a case 2 that forms an outer shell. Inside the case 2, an air passage for blowing air toward the vehicle interior is configured.

An inside / outside air box 5 having an inside air introduction port 3 and an outside air introduction port 4 is arranged at the most upstream portion of the air passage of the case 2. An inside / outside air door 6 is rotatably arranged in the inside / outside air box 5. The inside / outside air door 6 switches between an inside air mode in which the vehicle interior air is introduced from the inside air introduction port 3 and an outside air mode in which the vehicle interior outside air is introduced from the outside air introduction port 4. The inside / outside air door 6 is driven by a servomotor (not shown).

An electric blower 8 that generates an air flow toward the vehicle interior is arranged on the downstream side of the inner / outer air box 5. The blower 8 has a centrifugal blower fan 8a and a motor 8b for driving the blower fan 8a.

An evaporator 9 for cooling the air flowing in the case 2 is arranged on the downstream side of the blower 8. The evaporator 9 is a cooling heat exchanger that cools the blown air of the blower 8. The evaporator 9 is one of the elements constituting the well-known vapor compression refrigeration cycle.

On the other hand, in the indoor air conditioning unit 1, a heater core 15 for heating the air flowing in the case 2 is arranged on the downstream side of the evaporator 9. The heater core 15 is a heat exchanger for heating that uses hot water of a vehicle engine as a heat source to heat cold air after passing through the evaporator 9. A bypass passage 16 is formed on the side of the heater core 15, and the bypass air of the heater core 15 flows through the bypass passage 16.

An air mix door 17 is rotatably arranged between the evaporator 9 and the heater core 15. The air mix door 17 is driven by a servomotor (not shown), and its opening degree can be continuously adjusted. The ratio of the amount of hot air passing through the heater core 15 to the amount of cold air passing through the bypass passage 16 and bypassing the heater core 15 is adjusted by the opening degree of the air mix door 17. As a result, the temperature of the air blown into the vehicle interior is adjusted.

At the most downstream part of the air passage of Case 2, there are a defroster outlet 19 that blows air conditioning air toward the front window glass of the vehicle, a face outlet 20 that blows air conditioning air toward the occupant's face, and the occupant's feet. A foot outlet 21 for blowing air-conditioned air toward the air is provided.

The defroster door 22, the face door 23, and the foot door 24 are rotatably arranged upstream of these outlets 19 to 21. These doors 22 to 24 are opened and closed by a common servomotor via a link mechanism (not shown).

By the way, in recent years, instrument panels have been required to be thinner in the vertical direction of the vehicle from the viewpoint of expansion of the vehicle interior and design. Further, the instrument panel tends to be equipped with a large-sized information device for notifying various information indicating the driving state of the vehicle in the central portion in the vehicle width direction or the portion facing the occupant in the vehicle front-rear direction.

Due to these factors, it is necessary to take measures such as making the air outlet narrower in the indoor air conditioning unit 1. However, if the width of the air outlet is made thin, the lateral vortex generated downstream of the air outlet accelerates the collapse of the core portion of the airflow blown out from the air outlet, and the reach of the airflow in the vehicle interior is shortened. The horizontal vortex is a vortex whose center is orthogonal to the flow direction of the air flow.

Therefore, in the indoor air conditioning unit 1 of the present embodiment, an air blowing device 50 for improving the reach of the airflow is connected to the face outlet 20 provided in the case 2 via the duct 30. The air whose temperature has been adjusted by the indoor air conditioning unit 1 is blown into the vehicle interior from the air blowing device 50 through the duct 30 from the case 2.

Hereinafter, the configuration of the air blowing device 50 will be described with reference to FIGS. 2 to 5. As shown in FIG. 2, the air blowing device 50 has a duct portion 51 and a flange portion 52. The duct portion 51 and the flange portion 52 are made of resin. Although not shown, the indoor air conditioning unit 1 shown in FIG. 1 is connected to the duct portion 51.

The duct portion 51 shown in FIGS. 3 and 4 is formed with a main flow path 510 through which the airflow passes. The duct portion 51 has a tubular shape having an oval cross section. The duct portion 51 has an introduction hole 511 for introducing air conditioning air into the main flow path 510 at a portion located on the upstream side of the air flow.

Further, the duct portion 51 is formed with a main hole 512 that blows out an air flow that becomes an operating air flow at a portion located on the downstream side of the air flow in the main flow path 510. The opening direction of the main hole 512 is set so that the working airflow is blown into the vehicle interior. The opening direction is the normal direction of the surface including the edge forming the main hole 512.

Specifically, as shown in FIG. 4, the duct portion 51 has a double-cylinder structure having an outer cylinder 51A and an inner cylinder 51B on the downstream side of the air flow. The outer cylinder 51A forms the outer shell of the duct portion 51. The inner cylinder 51B is arranged inside the outer cylinder 51A with a slight gap through which the air flow can pass with respect to the outer cylinder 51A. The inner cylinder 51B is shorter than the outer cylinder 51A in the axial direction.

The duct portion 51 has a main flow path 510 formed inside the inner cylinder 51B and inside a portion of the outer cylinder 51A that does not lap in the radial direction with the inner cylinder 51B. Further, the duct portion 51 is formed with an auxiliary flow path 513 through which the air flow passes between the outer cylinder 51A and the inner cylinder 51B. The auxiliary flow path 513 is a branch flow path that branches from the main flow path 510, and a part of the air flow that flows through the main flow path 510 flows into the auxiliary flow path 513.

The outer cylinder 51A and the inner cylinder 51B are connected to each other by a cylinder connecting portion 514 located on the downstream side of the air flow of the main flow path 510 and the auxiliary flow path 513. As shown in FIGS. 3 and 4, the cylinder connecting portion 514 forms an end face on the downstream side of the air flow in the duct portion 51. The cylinder connecting portion 514 has a ring shape, and the opening inside the cylinder connecting portion 514 constitutes the main hole 512.

The opening shape of the main hole 512 is a flat shape. Specifically, the opening shape of the main hole 512 is an oval shape. Around the main hole 512 in the duct portion 51, a pair of long edge portions 514a and 514b facing each other at a predetermined interval and a pair of short edge portions 514c and 514d connecting the pair of long edge portions 514a and 514b to each other. Is formed. The pair of short edge portions 514c and 514d are opposed to each other at a larger distance than the pair of long edge portions 514a and 514b. The pair of long edge portions 514a and 514b extend linearly so as to be parallel to each other. The pair of short edge portions 514c and 514d are curved in an arc shape so as to protrude in a direction away from the center of the main hole 512.

In the present embodiment, the longitudinal direction of the opening of the main hole 512 is referred to as the width direction DRw, and the lateral direction of the opening of the main hole 512 is referred to as the height direction DRh. Further, in the present embodiment, the size in the height direction DRh of the main flow path 510 is referred to as the flow path height, and the size in the width direction DRw of the main flow path 510 is referred to as the flow path width. The longitudinal direction of the opening of the main hole 512 is the direction in which the pair of long edge portions 514a and 514b in the main hole 512 extend. Further, the lateral direction of the opening of the main hole 512 is a direction orthogonal to the opening direction of the main hole 512 and the pair of long edge portions 514a and 514b, respectively.

In the duct portion 51, among the inner wall surfaces forming the main flow path 510, the inner wall surface connected to the main hole 512 constitutes the blowing inner wall surface 512d that determines the blowing angle of the working airflow blown out from the main hole 512. The blowing inner wall surface 512d extends from the downstream end of the inner cylinder 51B of the duct portion 51 toward the upstream of the air flow. More specifically, the blowout inner wall surface 512d is set in a range from the upstream end to the downstream end of the downstream flat portion 518, which will be described later. The blowing inner wall surface 512d extends along the center line CL of the main hole 512 so that the angle formed by the center line CL of the main hole 512 is substantially zero. As a result, the working airflow is blown out from the main hole 512 along the center line CL of the main hole 512.

A plurality of auxiliary holes 515 are formed around the main hole 512 in the duct portion 51. The auxiliary hole 515 is an opening for blowing out a support airflow that suppresses the action of drawing in air by the airflow. The auxiliary hole 515 is formed in the cylinder connecting portion 514 located on the downstream side of the air flow of the auxiliary flow path 513. The airflow passing through the auxiliary flow path 513 is blown out from the auxiliary hole 515 as a support airflow.

Specifically, the plurality of auxiliary holes 515 are formed with respect to the cylinder connecting portion 514 so as to be arranged in a ring shape. The auxiliary hole 515 is formed evenly over the entire circumference of the cylinder connecting portion 514 so that a part of the auxiliary hole 515 is not biased in the circumferential direction of the cylinder connecting portion 514. In the drawing showing the auxiliary hole 515, for convenience, a part of the auxiliary hole 515 is indicated by a reference numeral.

Here, among the inner wall surfaces forming the auxiliary flow path 513, the inner wall surface connected to the auxiliary hole 515 constitutes an angle defining portion 516 that determines the blowing angle of the working airflow blown out from the main hole 512. The angle defining portion 516 is composed of an inner wall surface extending from the downstream end of the outer cylinder 51A and the inner cylinder 51B of the duct portion 51 toward the upstream of the air flow. More specifically, the angle defining portion 516 is set in a range from the upstream end to the downstream end of the downstream flat portion 518, which will be described later.

A plurality of angle defining portions 516 are provided corresponding to the auxiliary holes 515. That is, the duct portion 51 is provided with the same number of angle defining portions 516 as the auxiliary holes 515. Each of the plurality of angle defining portions 516 extends along the center line CL of the main hole 512 so that the angle formed by the center line CL of the main hole 512 is substantially zero. As a result, the support airflow is blown out from the auxiliary hole 515 along the center line CL of the main hole 512.

The height of the duct portion 51 is changed from the upstream side to the downstream side of the air flow. That is, as shown in FIG. 4, the duct portion 51 has an upstream flat portion 517, a downstream flat portion 518, and a throttle portion 519.

The upstream flat portion 517 and the downstream flat portion 518 are portions inside the duct portion 51 in which the height of the flow path is maintained at a constant size. The throttle portion 519 is a portion where the flow path height of the main flow path 510 is reduced from the upstream side to the downstream side of the air flow. The throttle portion 519 is set between the upstream side flat portion 517 and the downstream side flat portion 518. The throttle portion 519 is set at a position closer to the main hole 512 than the introduction hole 511 in the main flow path 510 so that a contraction occurs in the vicinity of the main hole 512. The throttle portion 519 has a curved curved shape so that a portion connected to the upstream flat portion 517 and a portion connected to the downstream flat portion 518 are rounded.

A flange portion 52 is provided on the upstream flat portion 517. The flange portion 52 is a member for attaching the duct portion 51 to an instrument panel (not shown). The flange portion 52 is composed of a rectangular member provided so as to protrude from the duct portion 51 with respect to the outer circumference of the duct portion 51. The flange portion 52 is attached to the instrument panel by a connecting member such as a screw in a state where the portion on the upstream side of the duct portion 51 is fitted to the air outlet of the air conditioning unit. The flange portion 52 is formed with through holes 520 for passing connecting members such as screws near the four corners forming the corners.

Further, as shown in FIG. 5, inside the duct portion 51, the first partition member 53 and the first partition member 53 are used as a plurality of partition members for dividing the main flow path 510 in the longitudinal direction (that is, the width direction DRw) of the opening of the main hole 512. The second partition member 54 is arranged.

The first partition member 53 and the second partition member 54 are composed of flat plate-shaped members. In the first partition member 53 and the second partition member 54, the downstream end portions 532 and 542 on the downstream side of the air flow are positioned on the upstream side of the air flow from the opening position of the main hole 512. Specifically, in the first partition member 53 and the second partition member 54, the upstream end portions 531 and 541 are positioned between the upstream end and the downstream end of the upstream flat portion 517, and the downstream end portion 532. , 542 are positioned between the upstream end and the downstream end of the downstream flat portion 518.

The main flow path 510 is formed in a center flow path 510C sandwiched between a pair of side flow paths 510A and 510B and a pair of side flow paths 510A and 510B located on both sides of the DRw in the width direction by the first partition member 53 and the second partition member 54. It is divided. The air introduced into the main flow path 510 through the introduction hole 511 of the duct portion 51 is rectified by the main flow path 510 and then branches into a pair of side flow paths 510A, 510B and a center flow path 510C.

The first partition member 53 and the second partition member 54 are arranged so as to be line-symmetrical with respect to the center line CL of the main hole 512. The first partition member 53 and the second partition member 54 are arranged in a posture inclined at a predetermined angle Φ with respect to the center line CL of the main hole 512. Specifically, the first partition member 53 and the second partition member 54 are arranged so that the flow path width of the center flow path 510C is reduced from the upstream side to the downstream side of the air flow. In the first partition member 53 and the second partition member 54 of the present embodiment, the distance between the downstream end portions 532 and 542 (that is, the flow path width W2) is the distance between the upstream end portions 531 and 541 (that is, the flow). It is arranged so as to be smaller than the road width W1). As a result, the airflow blown out from the center flow path 510C has a higher velocity than the airflow blown out from the pair of side flow paths 510A and 510B.

Next, the air flow of the air blowing device 50 will be described. When the blower 8 of the indoor air-conditioning unit 1 starts operating, temperature-controlled air is introduced from the indoor air-conditioning unit 1 to the air blowing device 50 via the duct 30.

In the air blowing device 50, the air introduced into the duct portion 51 is blown out from the main hole 512 after passing through the main flow path 510. Specifically, in the air blowing device 50, as shown in FIG. 6, the air introduced into the duct portion 51 is a pair of side flow paths 510A and 510B set inside the duct portion 51, and a center flow path. It branches to 510C and flows. The width of the center flow path 510C is reduced toward the downstream side of the air flow by the first partition member 53 and the second partition member 54.

Therefore, the speed of the air flowing through the center flow path 510C is higher than that of the air blown out from the pair of side flow paths 510A and 510B. Then, the air flowing through the center flow path 510C is blown out from the main hole 512 in a state of high speed. Further, the air flowing through the pair of side flow paths 510A and 510B flows toward the main hole 512 at a slower speed than the air flowing through the center flow path 510C, and then is blown out from the main hole 512.

At this time, since the center flow path 510C is narrowed in the width direction DRw, the airflow blown out from the center flow path 510C spreads in the height direction DRh. Therefore, as shown in FIGS. 7 and 8, the lateral vortex Vt generated around the airflow blown out from the center flow path 510C has a center line CL of the main hole 512 as compared with the pair of side flow paths 510A and 510B. It tends to occur at a position away from. That is, the lateral vortex Vt generated by the velocity difference with the stationary fluid on the outside of the duct portion 51 is likely to be generated at a position away from the center line of the center flow path 510C.

According to this, although the airflow flowing through the pair of side flow paths 510A and 510B is sacrificed, the attenuation of the flow velocity of the working airflow blown out from the center flow path 510C is suppressed, so that the reach of the working airflow is lengthened. Can be done.

Further, the air blowing device 50 of the present embodiment is provided with a throttle portion 519 for reducing the flow path height of the main flow path 510 with respect to the duct portion 51. Therefore, the wind speed distribution of the working airflow in the lateral direction (that is, the height direction DRh) of the opening of the main hole 512 is made uniform as compared with the configuration in which the throttle portion 519 is not provided for the duct portion 51. ..

When the wind speed distribution of the working airflow is made uniform, the velocity boundary layer of the working airflow is separated from the center line CL of the main hole 512. Therefore, when the working airflow is blown out, the diffusion of the working airflow in the lateral direction (that is, the height direction DRh) of the opening of the main hole 512 is suppressed.

In particular, in the air blowing device 50 of the present embodiment, the airflow blown out through the center flow path 510C is faster than that of the pair of side flow paths 510A and 510B. As a result, the wind speed distribution of the working airflow in the center flow path 510C becomes a convex distribution having an extension in the height direction DRh, as shown in FIG. When the wind speed distribution of the working airflow expands in the height direction DRh, the velocity boundary layer of the working airflow is easily separated from the center line CL of the main hole 512, so that the working airflow diffuses in the height direction DRh when the working airflow is blown out. Is suppressed.

Here, as shown in FIGS. 6 and 9, the lateral vortex Vt generated around the working airflow expands from the inside to the outside of the main hole 512 in the vortex layer center VCL. The vortex layer center VCL of the lateral vortex Vt tends to be tilted by a predetermined angle θ with respect to the center line CL of the main hole 512. This predetermined angle θ is, for example, about 1.94 [deg] in the vortex layer center VCL of the lateral vortex Vt generated around the airflow blown from the pair of side flow paths 510A and 510B. These are based on the findings obtained by our research.

On the other hand, in the air blowing device 50, the support airflow is blown out from the auxiliary hole 515. Specifically, a support airflow is blown from the auxiliary hole 515 along the center line CL of the main hole 512. This support airflow intersects the vortex layer center VCL of the lateral vortex Vt downstream of the outlet of the main hole 512. Therefore, the lateral vortex Vt is likely to collapse due to the support airflow. That is, the development of the lateral vortex Vt generated downstream of the outlet of the main hole 512 is suppressed. The support airflow flows in the range indicated by the hatching of the dot pattern in FIGS. 6 and 9, for example.

In the air blowing device 50 described above, the flow path width of the center flow path 510C is reduced from the upstream side to the downstream side of the air flow by the first partition member 53 and the second partition member 54. According to this, the air flow easily flows through the center flow path 510C, and the air flow blown out through the center flow path 510C is faster than the pair of side flow paths 510A and 510B. As a result, in the center flow path 510C, the wind speed distribution of the working airflow becomes a convex distribution having an extension in the lateral direction of the opening of the main hole 512, and the position of the velocity boundary layer of the working airflow is separated from the center of the working airflow and laterally. The vortex Vt is likely to occur at a position away from the center of the working airflow. Therefore, the diffusion of the working airflow blown out from the main hole 512 is suppressed.

In addition, the air blowing device 50 has a structure in which a support airflow is blown out from an auxiliary hole 515 provided around the main hole 512. According to this, the support airflow collides with the lateral vortex Vt generated around the operating airflow downstream of the main hole 512, and the lateral vortex Vt is disturbed, so that the air drawing action itself is suppressed.

Therefore, according to the air blowing device 50 of the present embodiment, the diffusion of the working airflow is suppressed and the air drawing action itself of the working airflow is suppressed, so that the reachability of the working airflow blown out from the main hole 512 is improved. Can be planned.

In particular, the duct portion 51 is provided with a plurality of auxiliary holes 515 around the main hole 512. For this reason, the support airflow is likely to collide with the lateral vortex Vt generated around the operating airflow downstream of the main hole 512, and the lateral vortex Vt is likely to be disturbed downstream of the main hole 512, so that the air drawing action is sufficiently suppressed. can do.

(Second Embodiment)
Next, the second embodiment will be described with reference to FIGS. 10 and 11. In this embodiment, a part different from the first embodiment will be mainly described.

The air blowing device 50 described in the first embodiment sacrifices the airflow flowing through the pair of side flow paths 510A and 510B, and increases the reach of the working airflow blown out from the center flow path 510C. Therefore, in terms of lengthening the reach of the working airflow, the working airflow blown out from the center flow path 510C is more important than the working airflow blown out from the pair of side flow paths 510A and 510B.

In consideration of this, in the air blowing device 50 of the present embodiment, the airflow through which the plurality of auxiliary holes 515 have passed through the center flow path 510C in the circumferential direction of the cylinder connecting portion 514 is blown out with respect to the cylinder connecting portion 514. It is formed unevenly in the part where it is. In other words, the plurality of auxiliary holes 515 are provided more densely with respect to the pair of long edge portions 514a and 514b than with the pair of short edge portions 514c and 514d. In the state where the plurality of auxiliary holes 515 are densely provided, the distance between the plurality of auxiliary holes 515 is narrower than the others, or the number of the plurality of auxiliary holes 515 is larger than the others. Means the state of being.

Here, in the present embodiment, the substantially central portion of the pair of long edge portions 514a and 514b constitutes the center portion 512c that blows out the airflow that has passed through the center flow path 510C among the cylinder connecting portions 514 forming the main hole 512. ing. Further, in the present embodiment, the airflow in which the outer portion of the central portion of the pair of long edge portions 514a and 514b and the pair of short edge portions 514c and 514d pass through the pair of side flow paths 510A and 510B of the cylinder connecting portion 514 is passed. It constitutes the side portions 512a and 512b to be blown out.

The plurality of auxiliary holes 515 of the present embodiment are provided more densely with respect to the center portion 512c than with the side portions 512a and 512b. Specifically, as shown in FIGS. 10 and 11, the plurality of auxiliary holes 515 are provided in the center portion 512c and not in the side portions 512a and 512b. Along with this, the thickness Th of the portion of the side portions 512a and 512b forming the pair of short edge portions 514c and 514d is smaller than the thickness Tv of the center portion 512c.

Other configurations are the same as in the first embodiment. The air blowing device 50 of the present embodiment can obtain the same action and effect as those of the first embodiment from the same configuration or the equivalent configuration as that of the first embodiment.

In particular, in the air blowing device 50 of the present embodiment, a plurality of auxiliary holes 515 are provided more densely with respect to the center portion 512c than with the side portions 512a and 512b. According to this, the support airflow easily collides with the lateral vortex Vt generated around the airflow blown out from the center flow path 510C, and the action of drawing in the air by the airflow blown out from the center flow path 510C can be sufficiently suppressed. it can.

Specifically, the plurality of auxiliary holes 515 are provided in the center portion 512c, and are not provided in the side portions 512a and 512b. According to this, it is not necessary to provide the auxiliary holes 515 in the side portions 512a and 512b. Therefore, for example, the thickness Th of the side portions 512a and 512b is reduced to reduce the size of the opening of the main hole 512 in the duct portion 51 in the lateral direction or to increase the opening width of the main hole 512 in the lateral direction. It becomes possible to plan.

(Modified example of the second embodiment)
In the second embodiment described above, a plurality of auxiliary holes 515 are provided only in the center portion 512c, but the arrangement form of the auxiliary holes 515 is not limited to this.

If the plurality of auxiliary holes 515 are provided more densely with respect to the pair of long edge portions 514a and 514b than with the pair of short edge portions 514c and 514d, a small number of auxiliary holes 515 are provided with respect to the side portions 512a and 512b. It may be provided.

Here, the pair of short edge portions 514c and 514d have a larger curvature than the pair of long edge portions 514a and 514b. According to the investigation by the present inventors, the lateral vortex Vt is more likely to develop around the working airflow blown out from the portion having a large curvature than around the working airflow blown out from the portion having a small curvature in the main hole 512. It is considered that this is because the development rate of the lateral vortex Vt increases due to the large shape change around the portion having a large curvature.

Therefore, for example, as shown in FIG. 12, the arrangement form of the auxiliary hole 515 is such that a plurality of auxiliary holes 515 are provided in the side portions 512a and 512b and are not provided in the center portion 512c. Good. In this case, it is possible to suppress the development of the lateral vortex Vt generated around the working airflow blown out from the portion having a large curvature in the main hole 512 and suppress the air drawing action.

(Third Embodiment)
Next, the third embodiment will be described with reference to FIGS. 13 to 16. In this embodiment, a part different from the first embodiment will be mainly described.

As described in the first embodiment, the support airflow blown out from the auxiliary hole 515 intersects the vortex layer center VCL of the lateral vortex Vt downstream of the outlet of the main hole 512, so that the lateral vortex is generated downstream of the outlet of the main hole 512. The development of vortex Vt is suppressed.

However, if the support airflow crosses the lateral vortex Vt and then flows toward the center of the working airflow, the mainstream of the working airflow may be disturbed. Such turbulence in the mainstream of the working airflow affects the reach of the working airflow. This was found by the investigation of the present inventors.

Taking this into consideration, the air blowing device 50 of the present embodiment is set so that the blowing angle of the support airflow blown from the auxiliary hole 515 is away from the center line CL of the main hole 512, as shown in FIGS. 13 and 14. Has been done. The plurality of angle defining portions 516 of the present embodiment are inclined in a direction away from the center line CL of the main hole 512 from the upstream side to the downstream side of the air flow. In other words, in the duct portion 51, the inner wall surface of the auxiliary flow path 513 connected to the auxiliary hole 515 is expanded in a trumpet shape. The inner wall surface of the auxiliary flow path 513 connected to the auxiliary hole 515 is a facing surface facing each other in the inner cylinder 51B and the outer cylinder 51A.

The plurality of angle defining portions 516 are set with an inclination angle α with respect to the center line CL of the main hole 512 so that the support airflow flows along the vortex layer center VCL of the lateral vortex Vt. The angle defining portion 516 of this example is set to an angle at which the inclination angle α substantially coincides with the angle θ (= 1.94 [deg]) formed by the center line CL of the main hole 512 and the vortex layer center VCL of the lateral vortex Vt. Has been done. Each of the plurality of angle defining portions 516 is set to the same inclination angle α.

Here, in manufacturing, it is difficult to completely match the inclination angle α with the angle θ of the vortex layer center VCL of the lateral vortex Vt, and a slight error may occur. In consideration of this, it is desirable that the inclination angles α of the plurality of angle defining portions 516 are set within the range shown by the following mathematical formula F1, for example.
0 <α ≦ 2 × θ… (F1)

Further, the blowing inner wall surface 512d of the present embodiment is along the center line CL of the main hole 512 so that the angle formed by the center line CL of the main hole 512 is substantially zero, as in the first embodiment. It is extending. Therefore, the angle defining portion 516 of the present embodiment has an inclination angle α larger than the angle formed by the blowing inner wall surface 512d and the center line CL of the main hole 512 with respect to the center line CL of the main hole 512. Is tilted.

Other configurations are the same as in the first embodiment. The air blowing device 50 of the present embodiment can obtain the same action and effect as those of the first embodiment from the same configuration or the equivalent configuration as that of the first embodiment.

In the air blowing device 50 of the present embodiment, a plurality of angle defining portions 516 are formed in the main hole 512 from the upstream side to the downstream side of the air flow so that the supporting air flow flows along the vortex layer center VCL of the lateral vortex Vt. It is inclined away from the center line CL.

According to this, as shown in FIGS. 15 and 16, the support airflow blown out from the auxiliary hole 515 becomes difficult to approach near the center of the working airflow blown out from the main hole 512. As a result, the turbulence near the center of the working airflow is suppressed by the supporting airflow, so that the reachability of the working airflow blown out from the main hole 512 can be sufficiently improved. The support airflow flows in the range indicated by the hatching of the dot pattern in FIGS. 15 and 16, for example.

Specifically, the plurality of angle defining portions 516 are mainly arranged so that the inclination angle α of the main hole 512 with respect to the center line CL is larger than the angle formed by the blowing inner wall surface 512d and the center line CL of the main hole 512. It is inclined with respect to the center line CL of the hole 512. According to this, since it becomes difficult for the support airflow blown out from the auxiliary hole 515 and the mainstream of the working airflow blown out from the main hole 512 to intersect, the turbulence near the center of the working airflow due to the supporting airflow is sufficiently suppressed.

(Modified example of the third embodiment)
In the above-described third embodiment, similarly to the first embodiment, the blowout inner wall surface 512d extends along the center line CL of the main hole 512, but the present invention is not limited to this, and for example, the air flow. It may be inclined from the upstream side to the downstream side in a direction away from the center line CL of the main hole 512. In this case, it is desirable that the inclination angle α of the angle defining portion 516 is set to be equal to or larger than the angle formed by the blowing inner wall surface 512d and the center line CL of the main hole 512. More specifically, the inclination angle α of the angle defining portion 516 is the center of the blowout inner wall surface 512d and the main hole 512 with respect to the angle θ formed by the center line CL of the main hole 512 and the vortex layer center VCL of the lateral vortex Vt. It is desirable to set the angle so that the angle formed by the line CL is added.

However, when it is difficult to set the inclination angle α of the angle defining portion 516 to be equal to or larger than the angle formed by the blowout inner wall surface 512d and the center line CL of the main hole 512, the inclination angle α is mainly the blowout inner wall surface 512d. It may be set to be less than the angle formed by the center line CL of the hole 512.

In the third embodiment described above, each of the plurality of angle defining portions 516 is inclined from the upstream side to the downstream side of the air flow in a direction away from the center line CL of the main hole 512, but the air blowing device is illustrated. 50 is not limited to this. In the air blowing device 50, for example, a part of the plurality of angle defining portions 516 may be inclined in a direction away from the center line CL of the main hole 512, and the other may extend along the center line CL of the main hole 512.

(Fourth Embodiment)
Next, the fourth embodiment will be described with reference to FIGS. 17 to 23. In this embodiment, the parts different from the third embodiment will be mainly described.

As described in the first embodiment, the airflow blown out from the center flow path 510C spreads in the height direction DRh because the center flow path 510C is narrowed in the width direction DRw. Along with this, the angle formed by the center VCL of the vortex layer of the lateral vortex Vt and the center line CL of the main hole 512 tends to be larger in the downstream of the center flow path 510C than in the downstream of the pair of side flow paths 510A and 510B. ..

Hereinafter, the angle formed by the vortex layer center VCL of the lateral vortex Vt and the center line CL of the main hole 512 downstream of the center flow path 510C will be described with reference to FIGS. 17 to 20.

As shown in FIG. 17, in the air blowing device 50, in the center flow path 510C, the flow path width W2 at the downstream end of the center flow path 510C is smaller than the flow path width W1 at the upstream end. The length L × cosφ of the first partition member 53 and the second partition member 54 in the flow direction of the air flow is smaller than the total length of the main flow path 510 so that the first partition member 53 and the second partition member 54 can be accommodated in the main flow path 510. In addition, "L" is a dimension L in the direction along the plate surface of the first partition member 53 and the second partition member 54.

Further, in the air blowing device 50, as shown in FIG. 18, the flow path height h of the center flow path 510C is uniform from the upstream to the downstream.

As shown by the arrow AF1 in FIG. 19, the working airflow flows through the center flow path 510C configured in this way. Immediately after this working airflow is blown out from the main hole 512, it spreads in the height direction DRh as shown by arrows AF2 and AF2 in FIG. At this time, the expansion width δ of the working airflow in the height direction DRh can be expressed by the following mathematical formula F2 based on the ratio of the flow path areas upstream and downstream of the center flow path 510C.
δ = W1 × h / W2… (F2)

According to these, as shown in FIG. 20, the working airflow blown out from the main hole 512 through the center flow path 510C flows through the distance of “L × cosφ” along the flow direction of the airflow, and then “( It spreads in the height direction DRh by δ-h) / 2 ".

The vortex layer center VCL of the lateral vortex Vt is tilted with respect to the center line CL of the main hole 512 according to the spread of the working airflow in the height direction DRh. The angle θ2 formed by the vortex layer center VCL of the lateral vortex Vt and the center line CL of the main hole 512, which changes according to the spread of the working airflow in the height direction DRh, can be expressed by the following mathematical formula F3.
θ2 = tan ^-1 {(δ-h) / (2 x L x cosφ)} ... (F3)

In consideration of these factors, in the air blowing device 50 of the present embodiment shown in FIG. 21, the blowing angle of the support airflow blown from the auxiliary hole 515 is set to a different angle between the center portion 512c and the side portions 512a and 512b. ..

Specifically, in the air blowing device 50, as shown in FIGS. 22 and 23, the inclination angle α2 of the angle defining portion 516 provided in the center portion 512c is formed in the angle defining portion provided in the side portions 512a and 512b. It is larger than the inclination angle α1 of 516. In other words, of the plurality of angle defining portions 516, the portion corresponding to the auxiliary hole 515 provided in the center portion 512c is the main hole as compared with the portion corresponding to the auxiliary hole 515 provided in the side portions 512a and 512b. The inclination angle with respect to the center line CL of 512 is large.

In this example, the inclination angle α1 of the angle defining portion 516 corresponding to the side portions 512a and 512b is set to the same angle θ1 (= 1.94 [deg]) as in the third embodiment, as shown in FIG. ing.

Further, in this example, the inclination angle α2 of the angle defining portion 516 corresponding to the center portion 512c is set to an angle (= θ1 + θ2) obtained by adding θ2 to the above-mentioned angle θ1 as shown in FIG. ..

Here, in manufacturing, the inclination angle α1 is completely matched with the angle θ1 of the vortex layer center VCL of the lateral vortex Vt, or the inclination angle α2 is completely matched with the angle θ2 of the vortex layer center VCL of the lateral vortex Vt. This is difficult and some errors can occur.

Considering this, it is desirable that the inclination angle α1 of the angle defining portion 516 corresponding to the side portions 512a and 512b is set within the range shown by the following mathematical formula F4, for example.
0 <α1 ≦ 2 × θ1… (F4)

Further, it is desirable that the inclination angle α2 of the angle defining portion 516 corresponding to the center portion 512c is set within the range shown by the following mathematical formula F5, for example.
α1 <α2 ≦ 2 × θ1 + θ2… (F5)

Further, the blowout inner wall surface 512d of the present embodiment is along the center line CL of the main hole 512 so that the angle formed by the center line CL of the main hole 512 is substantially zero, as in the third embodiment. It is extending. Therefore, the angle defining portion 516 of the present embodiment has the center line CL of the main hole 512 so that the inclination angles α1 and α2 are larger than the angle formed by the blowout inner wall surface 512d and the center line CL of the main hole 512. It is inclined with respect to.

Other configurations are the same as in the third embodiment. The air blowing device 50 of the present embodiment can obtain the effects obtained from the same configuration or the equivalent configuration as that of the third embodiment as in the third embodiment.

In the present embodiment, since the support airflow blown out from the auxiliary hole 515 becomes difficult to approach the vicinity of the center of the working airflow blown out from the main hole 512, the turbulence near the center of the working airflow is suppressed by the supporting airflow. As a result, the reachability of the working airflow blown out from the main hole 512 can be sufficiently improved.

Here, the airflow blown out from the center flow path 510C has a flow path width that becomes smaller from the upstream side to the downstream side, so that the airflow blown out from the pair of side flow paths 510A and 510B has a main hole 512. It spreads in the lateral direction of the opening and is easy to flow.

On the other hand, the angle defining portion 516 corresponding to the center portion 512c has a larger inclination angle of the main hole 512 with respect to the center line CL than the angle defining portion 516 provided in the side portions 512a and 512b. According to this, it becomes difficult for the support airflow blown out from the auxiliary hole 515 provided in the center portion 512c and the operating airflow blown out from the main hole 512 to intersect. Therefore, the turbulence near the center of the working airflow due to the support airflow blown out from the auxiliary hole 515 provided in the center portion 512c is sufficiently suppressed.

Of the plurality of angle-defined portions 516, the portion corresponding to the center portion 512c is formed in the main hole 512 so that the inclination angle α2 is equal to or greater than the angle formed by the inner wall surface connected to the main hole 512 and the center line CL of the main hole 512. It is inclined with respect to the center line CL. According to this, it becomes difficult for the support airflow blown out from the auxiliary hole 515 provided in the center portion 512c and the mainstream of the operating airflow blown out from the main hole 512 to intersect. Therefore, the turbulence near the center of the working airflow due to the support airflow blown out from the auxiliary hole 515 provided in the center portion 512c is sufficiently suppressed.

(Modified example of the fourth embodiment)
In the above-described fourth embodiment, similarly to the third embodiment, the blowout inner wall surface 512d extends along the center line CL of the main hole 512, but the present invention is not limited to this, and for example, the main hole It may be inclined in a direction away from the center line CL of 512. In this case, it is desirable that the inclination angle α2 of the angle defining portion 516 corresponding to the center portion 512c is set to be equal to or larger than the angle formed by the blowing inner wall surface 512d and the center line CL of the main hole 512.

However, when it is difficult to set the inclination angle α2 of the angle defining portion 516 corresponding to the center portion 512c to the above-mentioned angle or more, the inclination angle α2 is set between the blowing inner wall surface 512d and the center line CL of the main hole 512. It may be set to less than the angle to be formed.

In the fourth embodiment described above, each of the plurality of angle defining portions 516 is inclined from the upstream side to the downstream side of the air flow in a direction away from the center line CL of the main hole 512, but the air blowing device is illustrated. 50 is not limited to this. In the air blowing device 50, for example, of the plurality of angle defining portions 516, the one corresponding to the center portion 512c is inclined in a direction away from the center line CL of the main hole 512, and the one corresponding to the side portions 512a and 512b is corresponding to the main hole 512. It may extend along the center line CL of.

(Other embodiments)
Although the typical embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and can be variously modified as follows, for example.

In the above-described embodiment, the opening shape of the main hole 512 is an oval shape formed by connecting an arc and a straight line, but the present invention is not limited to this. The main hole 512 is, for example, an elliptical shape having a rectangular shape, an arc shape having a large arc of curvature and an arc having a small radius of curvature connected, a polygonal shape such as a hexagon connecting straight lines, and a rectangular shape having rounded corners. It may have a shape such as. Further, the shape of the pair of long edge portions 514a, 514b and the pair of short edge portions 514c, 514d constituting the main hole 512 is not limited to a straight line or an arc, and the shape is such that irregularities are formed in the straight line or the arc. You may be.

In the above-described embodiment, a plurality of auxiliary holes 515 are formed around the main hole 512, but the duct portion 51 is not limited to this. The duct portion 51 may be formed with at least one auxiliary hole 515.

In the above-described embodiment, a fine round hole is exemplified as the auxiliary hole 515, but the hole shape of the auxiliary hole 515 is not limited to this. The hole shape of the auxiliary hole 515 may be, for example, an oval shape, a polygonal shape, or the like.

In the above-described embodiment, the main flow path 510 is divided into three flow paths such as a pair of side flow paths 510A, 510B and a center flow path 510C by the first partition member 53 and the second partition member 54. , Not limited to this. The main flow path 510 may be divided into four or more flow paths by, for example, three or more partition members. In this case, the flow paths located on both sides of the DRw in the width direction form a pair of side flow paths 510A and 510B, and a plurality of flow paths sandwiched between the pair of side flow paths 510A and 510B form the center flow path 510C.

In the above-described embodiment, the duct portion 51 provided with the upstream flat portion 517, the downstream flat portion 518, and the throttle portion 519 is illustrated, but the present invention is not limited thereto. For the duct portion 51, for example, any of the upstream side flat portion 517, the downstream side flat portion 518, and the throttle portion 519 may be omitted.

In the above-described embodiment, the one to which the air blowing device 50 of the present disclosure is applied to the air outlet of the indoor air conditioning unit 1 is illustrated, but the application target of the air blowing device 50 is not limited to this. The air blowing device 50 of the present disclosure can be widely applied not only to a moving body such as a vehicle but also to an air blowing outlet of an installation type air conditioning unit for home use or the like. Further, the air blowing device 50 of the present disclosure is not limited to an air conditioning unit that air-conditions a room, and 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.

Needless to say, in the above-described embodiment, the elements constituting the embodiment are not necessarily essential except when it is clearly stated that they are essential and when they are clearly considered to be essential in principle.

In the above-described embodiment, when numerical values such as the number, numerical value, amount, range, etc. of the components of the embodiment are mentioned, when it is clearly stated that it is particularly essential, and in principle, it is clearly limited to a specific number. Except as the case, it is not limited to the specific number.

In the above-described embodiment, when referring to the shape, positional relationship, etc. of a component or the like, the shape, positional relationship, etc., unless otherwise specified or limited in principle to a specific shape, positional relationship, etc. Etc. are not limited.

(Summary)
According to the first aspect shown in part or all of the above-described embodiment, the air blowing device includes a duct portion through which a flat main hole for blowing an air flow to be an operating air flow is opened. The main flow path is divided into a pair of side flow paths located on both sides in the longitudinal direction and a center flow path sandwiched between the pair of side flow paths by a plurality of partition members arranged inside the duct portion, and the center flow path is divided into a center flow path. The width of the flow path of the air flow decreases from the upstream side to the downstream side. Around the main hole of the duct portion, at least one auxiliary hole for blowing out a support airflow that suppresses the drawing of air by the operating airflow is provided.

According to the second viewpoint, the duct portion is provided with a plurality of auxiliary holes around the main hole. According to this, the support airflow tends to collide with the lateral vortex generated around the working airflow downstream of the main hole, and the lateral vortex tends to be disturbed downstream of the main hole, so that the air drawing action can be sufficiently suppressed. it can.

According to the third aspect, the plurality of auxiliary holes refer to the center portion that blows out the airflow that has passed through the center flow path rather than the side portion that blows out the airflow that has passed through the pair of side flow paths among the portions that form the main hole. It is densely installed. According to this, the support airflow easily collides with the lateral vortex generated around the airflow blown out from the center flow path, and the action of drawing in the air by the airflow blown out from the center flow path can be sufficiently suppressed.

According to the fourth viewpoint, the plurality of auxiliary holes are provided in the center portion and not in the side portion. According to this, it is not necessary to provide an auxiliary hole in the side portion. Therefore, for example, it is possible to reduce the thickness of the side portion to reduce the size of the opening of the main hole in the duct portion in the lateral direction or to increase the opening width of the main hole in the lateral direction. ..

According to the fifth viewpoint, the duct portion is provided with a plurality of angle defining portions corresponding to the auxiliary holes, which determine the blowing angle of the support airflow blown from the auxiliary holes. At least one of the plurality of angle defining portions is inclined from the upstream side to the downstream side of the air flow in a direction away from the center line of the main hole. According to this, since it becomes difficult for the support airflow blown out from the auxiliary hole to approach the vicinity of the center of the working airflow blown out from the main hole, the turbulence near the center of the working airflow is suppressed by the supporting airflow. As a result, the reachability of the working airflow blown out from the main hole can be sufficiently improved.

According to the sixth aspect, at least one of the plurality of angle defining portions has an inclination angle with respect to the center line of the main hole equal to or larger than the angle formed by the inner wall surface connected to the main hole and the center line of the main hole. It is inclined with respect to the center line of the main hole. According to this, since it becomes difficult for the support airflow blown out from the auxiliary hole and the mainstream of the working airflow blown out from the main hole to intersect, the turbulence near the center of the working airflow due to the support airflow is sufficiently suppressed.

According to the seventh aspect, the auxiliary holes are provided in each of the center portion that blows out the airflow that has passed through the center flow path and the side portion that blows out the airflow that has passed through the pair of side flow paths, among the portions that form the main hole. ing. The duct portion is provided with a plurality of angle defining portions corresponding to the auxiliary holes, which determine the blowing angle of the support airflow blown out from the auxiliary holes. The plurality of angle defining portions are inclined in a direction away from the center line of the main hole from the upstream side to the downstream side of the air flow. Of the plurality of angle-defined parts, the part corresponding to the auxiliary hole provided in the center part has a larger inclination angle with respect to the center line of the main hole than the part corresponding to the auxiliary hole provided in the side part. ..

According to this, since it becomes difficult for the support airflow blown out from the auxiliary hole to approach the vicinity of the center of the working airflow blown out from the main hole, the turbulence near the center of the working airflow is suppressed by the supporting airflow. As a result, the reachability of the working airflow blown out from the main hole can be sufficiently improved.

Here, the airflow blown out from the center flow path is smaller in the flow path width from the upstream side to the downstream side, so that the airflow blown out from the pair of side flow paths is in the shorter direction of the opening of the main hole. It spreads and is easy to flow.

In consideration of these, the angle-defined part corresponding to the center part has a larger inclination angle with respect to the center line of the main hole than the angle-defined part corresponding to the side part. According to this, it becomes difficult for the support airflow blown out from the auxiliary hole corresponding to the center part and the working airflow blown out from the main hole to intersect, so that the center of the working airflow due to the supporting airflow blown out from the auxiliary hole corresponding to the center part. Disturbance in the vicinity is sufficiently suppressed.

According to the eighth viewpoint, the portion corresponding to the auxiliary hole provided in the center portion among the plurality of angle defining portions is equal to or greater than the angle formed by the inner wall surface connected to the main hole and the center line of the main hole. It is inclined with respect to the center line of the main hole so as to be. According to this, it becomes difficult for the support airflow blown out from the auxiliary hole provided in the center part and the mainstream of the operating airflow blown out from the main hole to intersect, so that the support airflow blown out from the auxiliary hole provided in the center part is used. The turbulence near the center of the working airflow is sufficiently suppressed.

Claims (8)

It ’s an air blower,
A duct portion (51) is provided which forms a main flow path (510) through which the air flow passes and a flat main hole (512) for blowing out an air flow serving as an operating air flow is opened at a portion located on the downstream side of the main flow path. ,
When the size of the opening of the main hole in the main flow path in the longitudinal direction is defined as the flow path width,
The main flow path is formed into a pair of side flow paths (510A, 510B) and the pair of side flow paths located on both sides in the longitudinal direction by a plurality of partition members (53, 54) arranged inside the duct portion. It is divided into a center flow path (510C) to be sandwiched, and the width of the flow path of the center flow path is reduced from the upstream side to the downstream side of the air flow.
An air blowing device in which at least one auxiliary hole (515) for blowing a support airflow that suppresses the drawing of air by the operating airflow is provided around the main hole in the duct portion. The air blowing device according to claim 1, wherein the duct portion is provided with a plurality of the auxiliary holes around the main hole. The plurality of auxiliary holes are center portions (512a, 512b) that blow out airflow that has passed through the center flow path rather than side portions (512a, 512b) that blow out airflow that has passed through the pair of side flow paths among the portions that form the main hole. The air blowing device according to claim 2, which is closely provided with respect to 512c). The air blowing device according to claim 3, wherein the plurality of auxiliary holes are provided in the center portion and not provided in the side portion. The duct portion is provided with a plurality of angle defining portions (516) corresponding to the auxiliary holes, which determine the blowing angle of the support airflow blown out from the auxiliary holes.
The invention according to any one of claims 2 to 4, wherein at least one of the plurality of angle defining portions is inclined in a direction away from the center line of the main hole from the upstream side to the downstream side of the air flow. Air blower. At least one of the plurality of angle defining portions is such that the inclination angle of the main hole with respect to the center line is equal to or larger than the angle formed by the inner wall surface connected to the main hole and the center line of the main hole. The air blowing device according to claim 5, which is inclined with respect to the center line of the above. Among the portions forming the main hole, the auxiliary hole is a center portion (512c) that blows out an airflow that has passed through the center flow path and a side portion (512a, 512b) that blows out an airflow that has passed through the pair of side flow paths. It is provided for each
The duct portion is provided with a plurality of angle defining portions (516) corresponding to the auxiliary holes, which determine the blowing angle of the support airflow blown out from the auxiliary holes.
The plurality of angle defining portions are inclined in a direction away from the center line of the main hole from the upstream side to the downstream side of the air flow.
Of the plurality of angle-defined portions, the portion corresponding to the auxiliary hole provided in the center portion is inclined with respect to the center line of the main hole as compared with the portion corresponding to the auxiliary hole provided in the side portion. The air blowing device according to claim 2, wherein the angle is large. Of the plurality of angle-defined portions, the portion corresponding to the auxiliary hole provided in the center portion has an inclination angle equal to or greater than the angle formed by the inner wall surface connected to the main hole and the center line of the main hole. The air blowing device according to claim 7, which is inclined with respect to the center line of the main hole.

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