JPS62228832A - Air flow deflecting device of air conditioning duct - Google Patents

Abstract

PURPOSE:To gradually narrow the opening area and to hold constant the quantities of air blown through a blow-off port by equalizing an imaginary passage divided at the branch flow portions of respective fins, and guiding the air quantity introduced through a maximum flow speed passage of opening area between guide portions of fins to a small blow-off port of the maximum opening area. CONSTITUTION:A thin and long air blow-off duct 1' for blowing off perpendicularly an airstream A within a duct is formed sidewise at the tip end of the commonly used duct having a square section. The air stream within the duct flows in such a state wherein it assumes a maximum value S1 at the central portion, and is lowered to values S2 and S3 as it draws near to the wall surface on both sides. Even in respective flowpaths of the same section, divided between branched flow portions of respective fins, the flow speed becomes W1<W2< W3>W4>W5. Since a blow-off opening area L3 taken in through a flowpath W3 of the maximum flow speed is maximum, an airstream blown off from an opening area L3 is diffused and is lowered of its flow speed, whereas since blow-off opening areas L1 and L5 taken in from minimum flow speeds W1 and W5 are minimum, airstreams blown off through L1 and L5 are not diffused so much with the result that blown airstreams become equalized.

Description

[Detailed description of the invention] Industrial application field> The invention is to form a long opening air outlet along the side surface of an air conditioning duct and to emit a uniform air flow over the entire length of the air outlet. It is widely used not only for automobile registers but also for air conditioning equipment in general.

<Prior Art> It has been known in the past to form an elongated outlet on the side in an air conditioning duct, and there have also been devices for deflecting airflow at the elongated outlet.

= "2" L3 "L4 ="5), and the length of each fin changes linearly from upstream to downstream, creating a virtual flow path W, W2゜ defined by each fin tip. w,, w4. w5 were the same.

<Problems to be Solved by the Invention> Conventional devices are designed assuming that the airflow is uniform in any given x'-X' cross section within the duct; In reality, the airflow a5 at the center of the outlet 10' had the highest velocity and gradually decreased toward both sides. That is, the air flow velocity exhibits the phenomenon of as<aa<J) a2'>a.

In addition, since the airflow is distributed by the group of 20 fins, since the fin shape is a shield plate orthogonal to the airflow, the tips of the fins create turbulence and inhibit the formation of a smooth divided flow.
There were some unpleasant wind noises. Therefore, it is unsuitable for use as an air outlet for the air chamber 1 in a passenger car, where it is desired to blow out a homogeneous rush from a thin and long opening.

Means and operation for solving the problems> The present invention is to form an elongated side air outlet in an air conditioning duct so that air is evenly blown out from the entire outlet,
The air flow velocity in a conventional duct with a square cross section is maximum in the center due to wall friction resistance, so as shown in FIG. 1, virtual passages W1. W2
．． While making W3°"4" W5 equal, the opening area L1 between the guide portions 22 of each fin. L2. L3.
L4. The amount of air sent through the maximum flow velocity passage W3 is guided to the outlet port 1' with the maximum opening area, and the opening area between the guide portions is sequentially narrowed as the air flow velocity in the virtual passage decreases. The amount of air blown out from between each fin guide section is kept constant.

A long and narrow air outlet 1' is formed on the side of the tip of the duct for blowing out the air inside the duct at right angles.

The duct section of the air outlet section was formed by sloping the earthen wall surface so that the cross-sectional area of the duct becomes smaller as the air moves forward. As shown by the velocity curve S, the air flow in the duct reaches its maximum in the central part s1 due to the frictional resistance with the wall surface, and moves to both sides S2.
S, and gradually become smaller.

Inside the duct of the outlet, there is a branch part 2 parallel to the air flow at the tip.
1 and a guide part 22 perpendicular to the air flow are connected by a smooth curved surface consisting of a radius R to divide the air flow in the duct between each fin. Road W1. W2゜W! $1 ”41 W5 are equal, and the opening area between each fin guide part 22 is,
L2. L3. L4. Depending on the flow velocity of the virtual flow path to which It5 corresponds, I+ corresponding to the maximum flow speed flow path W3 is set to the maximum, and the flow path W5. L5. corresponding to W1. L
It was fixed between the upper and lower plates of the duct, with l being the minimum. Note that the corners of the ends of the ducts were also formed with smooth curved surfaces similar to the fins.

In the obtained device, the air flow in the duct has a maximum value S1 in the center, and flows toward both sides S and S3, decreasing as it approaches the wall surface, and each air flow with the same cross section is divided between the branch parts of each fin. Even in a road, the flow velocity is Wl<W2<W, >W4>
W5, but since the air outlet area L3 adopted from the flow path W3 with the maximum flow velocity is the maximum, the air flow blown out from the opening area L3 is diffused and the flow velocity is reduced, and the minimum flow velocity W1. Blowout opening area L1 adopted from W5. Since L5 is the minimum, the airflows blown out from Ll and L5 are not diffused much, and the airflows blown out from between each fin eventually have a uniform flow velocity.

In addition, because the slope of the soil wall surface of the duct part 2 of the air outlet is narrowed so that the cross-sectional area decreases as it goes forward, a deflection component force is generated in the air flow in the duct toward the outlet, and the duct is The resistance to bending the air streamer at right angles can be reduced, and the air collision pressure against the fin group can be reduced.

In addition, each fin has a dividing part that is parallel to the airflow, which simply divides the airflow into left and right sides, and the airflow is guided by a smooth curved surface to the guide part that deflects the airflow at right angles, so turbulence caused by the fins can occur. And wind noise could be prevented.

In addition, because the airflow was deflected and guided smoothly, no polar strikes occurred even though the fins were thin plates.

Note that the airflow change curve S changes depending on the cross-sectional shape of the duct, and the opening area between each fin L1°L2. L3
．． L4. It will be obvious to those skilled in the art from the above description that L5 should be set in accordance with the air flow change curve.

<Effects of the Invention> Regardless of whether the outlet is long and narrow on the side of the duct, a uniformly diffused outlet flow can be obtained over the entire length.

Since the tip of the fin simply divides the airflow to the left and right, there is no vibration at the tip of the fin, and wind noise can be prevented.

[Brief explanation of drawings]

FIG. 1 is an explanatory cross-sectional view of the device of the present invention, and FIG.
-Y line cross section is shown. FIG. 2 is an external perspective view of the device of the present invention. FIG. 3 is a cross-sectional view of a conventional device corresponding to FIG. 1. 1: Duct, 1': Air outlet, 2: Fin, 21: Dividing part of fin, 22: Guide part of fin, A: Air flow in duct, a: Blowout air flow, S: Air flow velocity change curve, Wl.・
- W5: Virtual flow path, L,...L5: Opening area between guide parts. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A lateral outlet (1') is formed in the duct (1),
In the air outlet, a group of fins (2) are arranged in parallel so that the opening areas (L_1 to L_5) between the fins are different so that uneven flow velocity in the duct is distributed to uniform flow velocity and the air is blown out. Duct airflow deflection device. 2. Forming a side outlet (1') in the duct (1),
Inside the air outlet, a group of fins (2) consisting of a flow dividing part (21) and a guide part (22) are arranged, and virtual flow paths (W_1, W_2, W_3, W_4, W_
5) are equal and the opening areas (L_1, L_2, L_3, L_4, L_5) between the guide parts (22) of each fin are arranged to have different dimensions, so that the airflow from between the guide parts (22) is An airflow deflection device according to claim 1, in which the following are equivalent. 3. The fin (2) forms a continuous curved surface with a radius (R) extending from the branch part (21) parallel to the air flow to the guide part (22) perpendicular to the air flow. An air flow deflection device as described in . 4. The air flow deflection device according to claim 1, wherein the opening area between each fin guide portion (22) is set in accordance with the flow velocity change curve of the air flow in the duct.