JP3139891B2 - Air conditioning blower for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-conditioning blow-off device for a vehicle for realizing a comfortable indoor environment, and more particularly, to an air-conditioning blow-out device for a vehicle having improved air distribution performance of a blown air flowing through a ceiling portion of an automobile or the like. Related to the device.

[0002]

2. Description of the Related Art Conventionally, when cooling the interior of a vehicle, air heated by direct sunlight or the like on the upper surface of an instrument panel is blown out from a secondary outlet provided above a normal ventilation outlet. For example, Japanese Patent Application Laid-Open No. Sho 59-100013 discloses a vehicle air-conditioning blow-out device which is induced by cold wind to guide the passenger to a position above the occupant's head.
-26971.

As described above, the secondary air outlet is independently provided at a predetermined elevation angle above the normal ventilation air outlet, so that the cool air blown out from the normal ventilation air outlet stays on the ceiling. Since the air is directed to the occupant almost without inviting the hot air, a comfortable environment by the cold air cooled to the required temperature can be secured.

[0004]

Problems to be Solved by the Invention FIGS. 7A and 7B
Fig. 3 schematically shows a flow state of air from an air outlet in a vehicle air-conditioning outlet having a secondary outlet above.

As shown in FIG. 1 (b), the wind blown from the secondary outlet 12 'is particularly restricted from flowing upward by the wall surface of the ceiling, and at the same time, the outlet 12'.
The pressure distribution (velocity distribution) is biased downward near the outlet of the outlet 12 ′.

As a result, the direction of the wind blown from the secondary outlet 12 'is directed downward from the above-mentioned elevation angle, and approaches the wind blown from the lower ventilation outlet 11'. Will be. Thus, at the boundary between the winds blown out from the upper and lower outlets 12 ', 11', an induced wind due to the viscosity of the air is generated, resulting in a negative pressure. The wind blown from the upper part is drawn to the negative pressure portion, and the intended air distribution performance, which is the intended purpose, is significantly reduced. In order to avoid this, it is conceivable to set the elevation angle to a large value.However, if the elevation angle is increased, the wind hits the ceiling surface at an acute angle, which not only reduces the amount of air sent to the rear of the passenger compartment but also reduces the reflected current. And the mixed flow with the hot air staying on the ceiling more than before is guided to the occupant's face or the like, further deteriorating the indoor environment.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to develop an outlet structure for improving the air distribution performance of the secondary air-conditioning outlet.

[0008]

In order to achieve this object, the present invention has an ordinary main air-conditioning outlet for blowing air toward an occupant and a predetermined elevation angle for blowing air to the rear of a passenger compartment along a ceiling. In a vehicular air-conditioning blow-out device having upper and lower independent outlets, a weir is provided at the bottom opening edge of the auxiliary outlet, and the height of the weir is five times the opening height of the auxiliary outlet. ~
The main configuration is that it is set to 15%.

[0009]

In comparison with the conventional wind pressure distribution, the air flowing at the bottom of the sub outlet is deflected upward by the weir, and the wind pressure distribution is also deflected upward. As a result, the direction of the wind blown out from the sub-outlet substantially coincides with the elevation angle of the sub-outlet, and flows away from the wind blown out from the lower main outlet. In this way, since the wind blown out from the main outlet and the wind blown out from the sub-outlet flow in a completely separated state, the winds blown out from the upper and lower outlets flow independently of each other. The purpose is to significantly increase the upward air distribution performance. Then, as the rising angle of the weir portion increases, the direction of the wind blown out from the sub-outlet sequentially changes upward.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a perspective view of a typical air-conditioning outlet of the present invention as viewed from the front, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1 showing an example of the structure of the air-conditioning outlet, and FIG. It is an expanded sectional view showing the pressure distribution of the air flow near the secondary outlet of an outlet device. The air-conditioning blow-off device of the present invention has the appearance as shown in FIG. And a plurality of air blowing devices are connected to an air conditioning unit via an air conditioning duct. The above configuration is a general configuration except for the air-conditioning blow-out device of the present invention, and is not illustrated.

A lower main air outlet 11 and an upper auxiliary air outlet 12 are formed on an opening surface of each of the blowing devices 10 facing an occupant, with an intermediate wall surface 13 therebetween. Then, inside the main outlet 11, the knob 3 is simultaneously moved in the same direction by moving the knob 3 up, down, left, and right as in the related art.
A large number of vertical blades 1 and horizontal blades 2 for changing the direction of blowing cold air up, down, left, and right are attached. The sub outlet 12 formed on the upper side via the intermediate wall surface 13 is directed obliquely upward at a predetermined elevation angle θ, and a number of vertical blades 4 are parallel to the inside thereof at predetermined intervals in the left and right directions. It is fixed to.

In such a configuration, the most important part of the present invention lies in the structure of the outlet end of the sub outlet 12. That is, in the present invention, as shown in FIG. 2, the weir 12a is slightly provided at the bottom edge of the outlet end. This weir 12
The height L1 of a has a deep relationship with the opening surface height L2 at the outlet end, and according to experiments by the inventors, the weir height L1 is set in the range of 5 to 15% of the opening surface height L2. I knew it was best to do it. If it is less than 5%, the desired air distribution performance cannot be obtained, and if it exceeds 15%, the opening area of the outlet becomes relatively small, and turbulent flow inside the outlet becomes severe and the amount of blown air decreases. At the same time, the air distribution performance deteriorates. Of course, depending on the cross-sectional shape of the weir 12a, the ratio between the weir height L1 and the opening surface height L2 can be appropriately changed within the above range.

FIG. 3 shows a wind pressure distribution at the outlet end of the sub-outlet 12 when the weir 12a is provided at the outlet end. As is clear from the comparison between FIG. 7 and the previously described FIG. 7B, the structure of the sub-outlet 12 according to the present invention shows that the sub-outlet 12
The air flowing at the bottom of is deflected upward by the weir 12a,
The wind pressure distribution is also biased upward. As a result, the direction of the wind blown out from the sub-outlet 12 becomes the same as the elevation angle θ of the sub-outlet 12, and flows away from the wind blown out from the main outlet 11 below. In this way, the cool air blown out from the main outlet 11 and the cool air blown out from the sub-outlet 12 flow in a completely separated state, so that the winds blown out from the upper and lower outlets 12 and 11 are generated independently. Without significantly increasing the intended purpose of air distribution performance upwards.

FIG. 4 shows the change in the wind direction due to the cross-sectional shape of the weir 12a. When the rising angle φ of the weir 12a is gradually reduced as shown in FIGS. The direction of the blown wind changes upward.

FIG. 5 shows the measurement positions (X, Z) of the amount of air blown 175 mm forward from the air outlet in the air blower of the present invention and the conventional air blower having a sub-air outlet having no weir. Is shown. FIG. 5 is a wind speed distribution diagram showing the measurement results. FIG. 5A shows the wind speed distribution of the air conditioning blower of the present invention, and FIG. The wind speed distribution is shown. FIG. 6 is a definition diagram of the measurement origin.

The conditions for measuring the wind speed distribution are as follows. <Invention device> Blow-out air volume: 3 m ³ / min Vertical blade position: neutral Horizontal blade position: neutral Measurement range: X-Z two-dimensional plane is measured in a grid pattern at a pitch of 25 mm Z-direction range is based on the measurement origin To +200 to -100m
m The range in the X direction is +150 to -150 m based on the measurement origin.
m <Conventional device> Blow-out air volume: 3 m ³ / min Vertical blade position: Neutral Horizontal blade position: Neutral Measurement range: X-Z two-dimensional plane is measured in a grid pattern at 25 mm pitch Z-direction range is based on measurement origin To +250 to -100m
m The range in the X direction is +150 to -150 m based on the measurement origin.
m As is clear from both figures, the wind speed distribution of the device of the present invention is clearly separated vertically (Z direction) compared to the wind speed distribution of the conventional device.

[0017]

As is apparent from the above description, according to the present invention, a sub-outlet is provided at a predetermined elevation angle above a normal main outlet, and an opening is formed at the bottom opening edge of the sub-outlet. Since a weir portion having a height corresponding to the height is provided, the blowout flow flowing through the bottom of the sub outlet is pushed upward by the weir portion, and the upper and lower pressure distribution in the opening is deflected upward. The direction of air blown out from the sub-outlet can be made substantially coincident with the elevation angle of the sub-outlet, and a secondary blowout blown out from a position higher than a normal main outlet toward the ceiling is blown out from the main outlet. The orientation performance can be secured without being attracted to the blowoff flow. Therefore, the air blown out from the sub-outlet is reliably guided along the ceiling surface, and the heated air due to direct sunlight or the like staying in the ceiling is sent to the rear of the passenger compartment, and the occupant receives the air blown out from the main outlet. At the same time, a comfortable indoor environment can be obtained in a short time.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a typical structural example of a vehicle air-conditioning blow-out device of the present invention as viewed from the front.

FIG. 2 is a longitudinal sectional view showing an example of an outlet which is a main part of the present invention.

FIG. 3 is an enlarged sectional view showing a function of an outlet end of a sub-outlet which is a feature of the present invention.

FIG. 4 is an explanatory diagram showing a change in wind direction depending on a cross-sectional shape of the outlet end.

FIG. 5 is a measurement distribution diagram of blow-out air velocity of the air-conditioning blow-out device having the device of the present invention and a conventional sub-outlet.

FIG. 6 is a definition diagram of the measurement origin.

FIG. 7 is an illustration of a conventional air-conditioning blow-out device having a sub-outlet and its function.

[Explanation of symbols]

 1, 4 vertical blade 2 horizontal blade 3 knob 10 air-conditioning blow-out device 11 main outlet 12 sub-outlet 12a weir 13 intermediate wall surface

Claims (1)

(57) [Claims] 1. A vehicle air conditioner having a vertically independent upper and lower independent air outlet for blowing air toward an occupant and a sub air outlet having a predetermined elevation angle for blowing air to the rear of a passenger compartment along a ceiling. In the blowing device, a vehicle is provided, wherein a weir is provided at an edge of a bottom opening of the sub-outlet, and a height of the weir is set to 5 to 15% of an opening height of the sub-outlet. Air conditioning blower.