JPH10238516A - Fluid flow direction control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control a fluid flow direction by driving a lid member for releasing a communication hole and supplying a fluid to the internal space of a flow passage, and inclining the flow direction toward a dead water region via a pressure difference, regarding the fluid downstream of a narrow part. SOLUTION: When a left damper 36 is vibrated to release a left opening 34 and a right louver 44 is thereby made to oscillate, an air flow tends to adhere to the right louver 44 due to the Coanda effect. An air flow running through a bottleneck part 3 and an expanded part 4 is energized toward the direction along the right louver 44. Also, as the air flow is made to have a sufficiently high speed on the first inclined surface 20, the pressure of a right dead water region 33 is kept lower than the atmospheric pressure. A left dead water region 32, however, is kept at the atmospheric pressure, because of communication to the atmosphere via the released left 34 opening. Thus, the air flow running through the bottleneck part 3 is energized toward the right dead water region 33, due to a pressure difference. According to this construction, both of an energizing force due to the Coanda effect and an energizing force due to the pressure difference act on the air flow. As a result, the air flow B blown from an opening 41 can be diverted left direction viewed toward the opening 41, or a right direction viewed from the air flow B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for controlling a flow direction of a fluid such as air or water. INDUSTRIAL APPLICABILITY The fluid flow control device of the present invention can be used, for example, in the structure of an air-conditioning register that forms an opening that blows out hot air or cold air into an automobile interior.

[0002]

2. Description of the Related Art An instrument panel of an automobile is provided with a register as an opening for blowing hot and cold air from an air conditioner. This register includes a cylindrical retainer that forms an air flow path and a blowout opening, and a plurality of parallel wind direction deflecting plates that are swingably arranged in the retainer. Generally, the angle of the wind direction deflecting plate is manually adjusted. The wind direction can be adjusted by adjusting it.

The wind direction deflecting plate includes a horizontal deflecting plate which extends in the horizontal direction and swings up and down to change the wind direction in the vertical direction, and a wind direction deflecting plate which extends in the vertical direction and swings in the left and right direction to change the wind direction in the left and right direction. Two types, a vertical deflection plate, are generally provided. A knob is provided on each of the horizontal deflection plate and the vertical deflection plate, and a plurality of horizontal deflection plates or a plurality of vertical deflection plates are simultaneously swung by operating the knob.

[0004]

However, in the conventional register, the air flow supplied from the air conditioner is caused to collide with the vertical and horizontal deflection plates and to be guided in the inclination direction of the vertical and horizontal deflection plates. Controls the direction of air flow. Therefore, as the vertical and horizontal deflecting plates are swung to the maximum swing angle, the angle of entry of the airflow and the relative angle between the deflecting plates become larger, the eddy current becomes larger and becomes a source of noise, and the air conditioning efficiency is reduced. It is causing a decline.

Further, as the vertical deflection plate and the horizontal deflection plate are swung to the maximum swing angle, the area of the ventilation path decreases, and the flow velocity of the air flow increases. Further, since the vertical deflection plate and the horizontal deflection plate are arranged near the opening of the register, there is a limit in improving the design of the register.

The present invention has been made in view of such circumstances, and enables the flow direction of a fluid discharged from an opening to be controlled without using, for example, a vertical deflection plate or a horizontal deflection plate of a register. The purpose is to:

[0007]

A feature of the fluid flow direction control device according to the present invention that solves the above-mentioned problems is that a fluid flow direction is provided in a flow path toward an opening, and a cross-sectional area of the flow path is locally reduced. A constricted portion, an inclined surface provided so that the cross-sectional area of the flow path increases from the constricted portion toward the opening, a variable means for changing the inclination angle of the inclined surface, and a portion provided near the partial wall surface of the constricted portion A dead water area where the fluid is dead water, a communication hole provided at a position facing the dead water area in the radial direction of the flow path cross section to communicate inside and outside of the flow path, a lid member for opening and closing the communication hole, and a communication hole And a supply means for supplying a fluid to the inside of the flow path via the, guides the flow direction of the fluid in the direction along the inclined surface by driving the variable means to attach the flow of the fluid to the inclined surface,
In addition, the lid member is driven to open the communication hole to supply the fluid to the inside of the flow path, and the flow direction of the fluid downstream of the constriction is inclined toward the dead water area by a pressure difference to control the flow direction of the fluid. It is in.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the fluid flow direction control device according to the present invention, the flow path has a small cross-sectional area at the constriction, so that the fluid has a maximum flow velocity when passing through the constriction. When the fluid is an air flow, the pressure is lower than the atmospheric pressure when the flow velocity is high. Although the dead water area is provided in the constricted area, the dead water theory starting with Kirchhoff assumes that the pressure in the dead water area is constant and lower than the pressure of the fluid flowing through the free stream line. The pressure of the fluid is lower than the pressure of the fluid flowing through the constriction, and lower than the atmospheric pressure if the fluid is an air flow.

On the other hand, in the fluid flow direction control device of the present invention, the fluid is supplied from the supply means to the position facing the dead water area in the radial direction of the flow path cross section by driving the damper to open the communication hole. You. Therefore, the pressure on one side of the dead water area becomes low and the other side on the communication hole side becomes high pressure, so that the fluid passing through the constriction receives the urging force from the high pressure side, and the flow direction is the dead water area side. Try to incline to

Further, the fluid flow direction control device of the present invention is provided with an inclined surface whose cross-sectional area of the flow path increases from the constricted portion toward the opening, and variable means for varying the inclined angle of the inclined surface. Since the fluid has a characteristic called the Coanda effect that tends to flow along the flow path wall surface, the flow direction of the fluid can be changed along the inclined surface by the Coanda effect. In other words, first, when the direction of the inclined surface is the same as the flow direction of the fluid, the flow direction of the fluid before and after the constriction is naturally the same. Next, when the variable means is driven to slightly incline the inclined surface with respect to the flow direction of the fluid on the upstream side of the constriction, the flow direction of the fluid on the downstream side of the constriction due to the Coanda effect is the same as the direction along the inclined surface. Try to be.

Therefore, the action due to the above-mentioned pressure difference,
By the two actions, the action by the Coanda effect, it becomes possible to change the flow direction of the fluid at the constriction. By adjusting the positions of the dead water area, the communication hole, and the inclined surface, the flow direction of the fluid can be controlled in an arbitrary direction. As the inclined surface, the side wall itself at the opening end of the flow path may be the inclined surface, or a plate-like member that is swingably disposed on the wall surface of the opening end of the flow path may be the inclined surface.

The supply means may be any as long as it supplies the same fluid as the fluid flowing in the flow path at a pressure higher than the pressure of the fluid in the flow path, and various supply devices can be used. Further, if the fluid is air and the pressure of the fluid in the flow path is equal to or lower than the atmospheric pressure, the atmosphere can be supplied into the flow path only by opening the communication hole to the atmosphere. Means atmospheric pressure.

[0013]

The present invention will be described below in detail with reference to examples. In this embodiment, the fluid flow direction control device of the present invention is applied to a register for a vehicle. FIG. 1 is a perspective view of the register according to the present embodiment, and FIGS. The register has a cylindrical shape with a rectangular cross section as a whole, and includes a base 1 having a constant cross section, and a reduced diameter portion 2 extending from the base 1 so that the left and right side walls of the base 1 gradually approach each other to gradually reduce the cross sectional area. And a constricted portion 3 having a rectangular cross section extending from the reduced diameter portion 2 and an enlarged diameter portion 4 extending from the constricted portion so that the left and right side walls are gradually separated from each other and the cross-sectional area is gradually enlarged.

An end of the base 1 opposite to the reduced diameter portion 2 is connected to an air supply port of an air conditioner (not shown). A pair of first inclined surfaces 20 extending in directions approaching each other at an acute angle intersecting with the air flow direction A and constituting the left and right side walls of the reduced diameter portion 2, And orthogonal surfaces 30 extending outward from the ends of the orthogonal surfaces 30 in a direction orthogonal to the air flow direction A, and parallel surfaces 31 extending from the ends of the orthogonal surfaces 30 respectively parallel to the air flow direction A. ing.

That is, when the air flow supplied from the base 1 contacts the first inclined surface 20 and flows from the constricted portion 3 to the enlarged diameter portion 4, the air in the space surrounded by the orthogonal surface 30 and the parallel surface 31 Is almost stationary, so the orthogonal surface 3
0 and the parallel surface 31 surround the right dead water area 32
And a left dead water zone 33 are formed. A right opening 34 and a left opening 35 are respectively formed in the pair of left and right parallel surfaces 31, and the right opening 34 and the left opening 3
A right damper 36 and a left damper 37 for opening / closing 5 are swingably provided. The right damper 36 and the left damper 37
The pivot shaft of a servo motor (not shown) is fixed to each of the pivot shafts, and the right damper 36 is driven by the servo motor.
And the left damper 37 can open and close the right opening 34 and the left opening 35 independently.

A parallel surface 31 is provided on the inner surface of the enlarged diameter portion 4.
A pair of left and right second inclined surfaces 40 are formed extending from the end portions at directions that intersect at an acute angle with the air flow direction A and are separated from each other, and an opening 41 is formed at the tip of the enlarged diameter portion 4. Flanges 42 to which the bezel is fixed are formed on both left and right sides of the opening 41. Further, inside the enlarged diameter portion 4, a right louver 43 is provided near a pair of left and right second inclined surfaces 40.
And a left louver 44 are disposed. This right louver 4
The 3 and left louvers 44 are respectively erected so as to be orthogonal to the upper and lower side walls of the enlarged diameter portion 4, and one end on the upstream side is pivotally supported by the upper and lower side walls of the enlarged diameter portion 4, and heads toward the opening 41 on the downstream side. The end is swingable.

The pivot shafts of the right louver 43 and the left louver 44 are fixed with the rotation axes of a pair of servomotors 45 and 46 fixed to the outer surface of the enlarged diameter portion 4, respectively. , The right louver 43 and the left louver 44 can independently swing at an arbitrary angle between a direction parallel to the air flow direction A and a direction along the second inclined surface 40.

The operation of the thus constructed register of this embodiment will be described below. First, when the wind is blown out from the opening 41 toward the front, the right louver 43 and the left louver 44 are respectively set in a direction parallel to the air flow direction A as shown in FIG.
7 closes the right opening 34 and the left opening 35, respectively.

When the air conditioner is driven in this state, the air flow from the air supply port flows into the reduced diameter portion 2 from the base portion 1 and contacts the first inclined surface 20 to reduce the cross-sectional area of the flow path. Then, it flows into the stenosis part 3 while gradually increasing the flow velocity. In the stenosis part 3, the right dead water part 32 and the left dead water part 33 are dead water areas, and the right dead water part 32 and the left dead water part 33 have the lowest pressure. However, since the right dead water zone 32 and the left dead water zone 33 exist on both the left and right sides, no urging force for changing the flow direction is applied to the air flow. The airflow is also guided by the right louver 43 and the left louver 44, and the airflow blows out from the opening 41 toward the front.

Next, on the left side from the front toward the opening 41,
When the blowing direction is changed to the right as viewed from the air flow itself, the servo motor 46 is driven to swing the left louver 44 outward, that is, in the direction approaching the second inclined surface 40. At the same time, a servo motor (not shown) is driven to swing the right damper 36, and the right opening 34 is opened.
State.

As shown in FIG. 3, when the left louver 44 swings, the air flow tends to adhere to the left louver 44 due to the Coanda effect, and the air flow flowing through the narrowed portion 3 and the enlarged diameter portion 4 follows the left louver 44. Biased in the direction. Further, the air flow has a sufficiently high flow velocity on the first inclined surface 20, so that the pressure in the left dead water zone 33 is lower than the atmospheric pressure, but the right dead water zone 32 has the right opening 34 opened. Atmospheric pressure due to communication with the outside. Therefore, the airflow passing through the constriction 3 is urged toward the left dead water zone 33 by the pressure difference.

Therefore, both the urging force due to the Coanda effect and the urging force due to the pressure difference act on the air flow, whereby the direction B of the air flow blown out from the opening 41 moves leftward toward the opening 41, You can swing to the right as seen from the current. Then, if the left louver 44 is further swung outward to a position along the second inclined surface 40 as shown in FIG. 4, the air flow adheres to the left louver 44 due to the Coanda effect, so that the air blown out from the opening 41 The direction of the flow can be swung further to the left.

The opening 41 has the air flow direction opposite to the above.
When the right damper 36 is swung rightward, the right louver 43 is swung, the right damper 36 is closed, and the left damper 35 is opened. Becomes the high pressure side, and the air flow direction can be swung rightward toward the opening 41 by the same operation as described above.

The Coanda effect is effective when the angle between the original flow direction and the changing flow direction is within about 20 degrees when the wall surface is fixed, and the angle is changed more than that. It is difficult. However, if the inclination angle is changed by swinging the louvers 43 and 44 as in this embodiment, the flow direction of the air flow attached to the louvers 43 and 44 changes continuously. The angle can be changed to a large angle as shown.

That is, according to the register of the present embodiment, the vertical deflection plate, which has been conventionally required, is not required, so that the air flow collides with the vertical deflection plate to generate noise, and the airflow efficiency increases due to the increase in the ventilation resistance. Is avoided. Further, since a vertical deflection plate is not required, the degree of freedom of the front design of the opening 41 is improved.

[0026]

According to the fluid flow direction control device of the present invention, it is possible to control the flow direction of a fluid in an arbitrary direction without using a member that generates a projected area with respect to the flow direction. And the resistance can be reduced. When the present invention is applied to a vehicle register, a vertical deflection plate and a horizontal deflection plate are not required, so that noise and resistance can be reduced, and appearance and design can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a register according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a register according to an embodiment of the present invention.

FIG. 3 is a sectional view of a main part of a register according to an embodiment of the present invention.

FIG. 4 is a sectional view of a main part of a register according to an embodiment of the present invention.

[Explanation of symbols]

1: Base 2: Reduced diameter section
3: stenosis part 4: enlarged diameter part 32: right dead water part 3
3: Left dead water area 34: Right opening (communication hole) 35: Left opening (communication hole)
6: Right damper (lid member) 43: Right louver (inclined surface) 44: Left louver (inclined surface) 45, 46: Servo motor (variable means)

Claims (1)

[Claims] A narrow portion provided in a flow path through which a fluid flows toward an opening, wherein a cross-sectional area of the flow path is locally reduced;
An inclined surface provided so that a cross-sectional area of the flow path increases from the constricted portion toward the opening; a variable means for changing an inclination angle of the inclined surface; A dead water region where the fluid becomes dead water, a communication hole provided at a position facing the dead water region in the radial direction of the flow path cross section to communicate inside and outside of the flow path, and a lid member for opening and closing the communication hole. And supply means for supplying a fluid to the inside of the flow path through the communication hole. The flow direction of the fluid is changed by driving the variable means to attach the flow of the fluid to the inclined surface. The dead water area is guided in a direction along the inclined surface, and the lid member is driven to open the communication hole to supply a fluid to the inside of the flow path and to change the flow direction of the fluid downstream of the constricted portion by a pressure difference. Wherein the flow direction of the fluid is controlled by inclining the fluid flow direction. .