JPH0341931Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to an air conditioner for an automobile, and particularly to one in which the temperature of air blown out from a floor duct into left and right sides is uniform.

(Prior Art) In general, an air conditioner for an automobile includes an intake unit that selectively takes in air inside the vehicle or outside the vehicle, and a heater unit that heats the air from the intake unit and blows it out from a predetermined position inside the vehicle at a predetermined temperature. have.

However, in the case of an air conditioner for a vehicle such as a light vehicle, where the installation space for the air conditioner is small, the entire device must be made smaller, so the intake unit, heater unit, etc. must be connected in series. However, the air cannot be blown out through a straight air path, and the air blown out from the intake unit must be guided into an air path that is curved, for example, in a U-shape. However, if this type of air path is used, it is advantageous in terms of space, but the air flow becomes uneven and the air mixing performance deteriorates, so various ribs must be installed upright in the air path (for example, in actual use) (See Publication No. 58-14009).

However, when ribs are installed in the air passage, ventilation resistance increases and the air volume discharged into the vehicle interior decreases. Therefore, in air conditioners for small vehicles, the fan is used as a white fan to increase the air volume. In addition, when mixing cold air and hot air, in order to improve internal ventilation, ribs are not placed in the air passage, and the air is mixed at the entrance of the floor duct or inside the duct to mix cold air and warm air. It enhances the mixability with the wind.

More specifically, FIG. 4 is a schematic sectional view showing a conventional air conditioner for a small vehicle, and FIG. 5 is a schematic sectional view taken along the line - in FIG. 4. This automotive air conditioner 1 includes an intake unit 2 that selectively takes in air from inside or outside the vehicle;
It has a heater unit 3 that heats the air from the intake unit 2 and blows it out into the vehicle interior. The intake unit 2 has an inside/outside air switching box (not shown) for selectively taking in air from inside the vehicle interior or outside the vehicle interior, and a fan scroll 5 in which a sirloch fan 4 is installed. On the other hand, the heater unit 3 has a mix door 7 in the air passage F connected to the discharge port 6 of the fan scroll 5, and the mix door 7 directs a part of the air flowing through the air passage F to the heater core 8 side and the bypass passage 9 side. These airs are mixed in a mix chamber 10 and blown out from a differential duct 11 and a floor duct 12 (see Japanese Utility Model Application No. 58-97010).

In the figure, 12h is a knee air outlet, 13 is a vent duct, 14 is a vent door, and 15 is a floor duct door.

However, as shown in FIG. 5, the floor duct 12 branches left and right at almost right angles to the axis of the air passage F at its terminal end, and is provided with a driver-side blow-off duct 12d and an assist-side blow-off duct 12a. (Refer to Utility Model Application Publication No. 55-43946).

(Problem that the invention aims to solve) However, when controlling the mix door to mix cold air and hot air at a predetermined ratio to obtain air at a predetermined temperature, this problem occurs. Due to the shape of the fan scroll 5 and the characteristics of the Sirotskov fan 4, the air flowing into the floor duct 12 does not blow out cold air horizontally as shown in FIG. Since the cold air is blown out toward the side wall 5b, a small amount of cold air tends to flow toward the assist side blow-off duct 12a, and a large amount tends to flow through the driver-side blow-off duct 12d.

In other words, there is a tendency that there is too little cold air on the assist side and too much cold air on the driver side, and this tendency does not change even if the duct partition wall 16 is provided as shown in FIG. 4.

Therefore, in the heater mode, the temperature of the air blown out from the left and right blowout ducts also has a negative effect, with the assist side, where a small amount of cold air is blown out, having a high temperature, and the driver side having a low temperature, causing the temperature inside the vehicle to decrease. The distribution also becomes uneven, which may impair the comfort inside the vehicle.

The present invention was developed in view of the above-mentioned problems, and its purpose is to improve the air mixing performance without installing ribs, and to reduce the temperature of the air blown out from both outlet ducts. The goal is to make it almost uniform.

(Means for Solving the Problems) In order to achieve the above object, the present invention extends the suction side side wall and the anti-suction side side wall of the fan scroll to the discharge port of the fan scroll in which the Sirotskov fan is installed. a heater core, a bypass passage that bypasses the heater core, a mix door that branches part of the air flow to the heater core side and the rest to the bypass passage side, and a mix door that branches a part of the air flow to the heater core side and the rest to the bypass passage side; A mixture chamber for mixing the air flowing through the bypass passage is provided, and a blow-off duct connected to the downstream region of the mixture chamber is connected to each of the through holes opened in the suction side side wall and the non-suction side side wall. In the conditioner, a guide wall is formed between the both side walls to guide the airflow flowing through the bypass passage to a downstream region of the heater core, and by cutting a tip of the guide wall, air is blown from the Sirotskov fan. This feature is characterized by the formation of a concave and convex portion that guides the airflow to the side opposite to the side where it is deflected.

(Function) If such a means is adopted, the airflow that is blown out in a biased manner due to the characteristics of the Sirotskov fan will be guided to the vicinity of the heater core by the guide wall, but the unevenness at the tip of the guide wall will prevent the biased flow. , it will be guided uniformly to the left and right air ducts,
The temperature of the air blown out from both ducts becomes uniform.

(Example) An embodiment of the present invention will be described below.

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and the same members as those shown in FIGS. 4 and 5 are given the same reference numerals.

The intake unit 2 has a spiral fan scroll 5 with a Sirotsukofan 4 installed therein, and an inside/outside air switching system that selectively introduces air inside the vehicle and air outside the vehicle into a portion of the Sirotsukofan 4 directly above the plane of the paper in FIG. 1. It has a box (not shown).

A vent duct 13 is connected to the air outlet 6 of the fan scroll 5, and a vent door 14 provided at the entrance of the vent duct 13 directs the airflow from the Sirotskov fan 4 directly toward the passenger's face by opening and closing it. Blowing out or the next wind path F
I'm trying to guide you.

As is clear from FIG. 1, the air passage F is formed in a substantially U-shape, and is connected to a through hole (not shown) provided in the downstream side wall 5a on the opposite suction side and the side wall 5b on the suction side of the mix chamber 10. Def duct 11 respectively
A mixer door 7 and a heater core 8 are provided in the middle of the air passage F.

When the mixer door 7 is set at an intermediate position, part of the air flowing through the air passage F is branched to the heater core 8 side and the remaining air is branched to the bypass passage 9 side at a predetermined ratio. It is mixed in mix chamber 10.

In particular, in this embodiment, a guide wall 20 is provided between the anti-suction side side wall 5a and the suction side side wall 5b so as to guide the air flowing through the bypass passage 9 to the downstream region of the heater core 8. An uneven portion 21 is formed at the tip of the wall 20 .

The uneven portion 21 is for correcting the uneven flow of air blown out from the airflow fan 4. For example, if the Sirotskov fan 4 has a drifting characteristic that causes a U-shaped flow as shown in the arrow in FIG. 2, a predetermined area from the non-suction side wall 5a can be cut out as shown in FIGS. 2 and 3. is preferred.

In other words, the tip of the guide wall 20 is made longer without cutting on the side where airflow easily flows due to the characteristics of the Sirotskov fan 4, and on the side where airflow is difficult to flow due to the characteristics of the Sirotskov fan 4. A notch 21a is formed, thereby making the uneven portion 2
It is preferable to form it so that it becomes 1.

Note that, depending on the characteristics of the Shirotsuko fan 4, the position of the notch 21a of the uneven portion 21 can be changed as appropriate.

In this way, when the mixer door 7 is in the intermediate position, the air passing through the bypass passage 9 is guided to the hot air region blown out from the heater core 8.
In addition, by flowing to the notch 21a side where it is easy to flow, the uneven flow of the air blown out from the Sirotsko fan 4 is corrected, and the cold air is directed to the driver side blow-off duct 12.
This will prevent the liquid from flowing out toward the side a.

As a result, the airflow that is blown out in a biased manner due to the characteristics of the Sirotskov Fan 4 is
The air is uniformly guided from the air to the left and right air ducts 12a, 12d.
The temperature of the air blown out is approximately uniform.

Further, a switching door 22 is provided near the end position of the U-shaped air passage F, and the airflow passing through the heater core 8 and the like is directed between the differential duct 11 side and the floor duct 1 side.
I try to distribute it to two sides.

Next, the effect will be explained.

Heat Mode When the mode lever on the controller is set to Heat Mode, the vent door 14 will open in the vent duct 1.
3 is closed, the switching door 22 closes the differential duct 11 and opens the floor duct 12. When the template lever is set to an intermediate position between full hot and full cool, the mix door 7 is placed in an intermediate position (see FIG. 1).

With the door set like this, the Sirotskov Fan 4
Suppose that when the rotation is performed, the airflow flows as shown by the solid line in FIG. 2, for example.

The air on the side of the heater core 8 is heated by the heater core 8 and deflected into a U-shape along the air path F. On the other hand, the air that has passed through the bypass passage 9 passes between the guide wall 20 and the heater core 8, is mixed with the warm air that has passed through the heater core, reaches a predetermined temperature, and passes through the back side of the guide wall 20 to the switching door 22.
The air is guided into the floor duct 12 and is blown out from the passenger's knee air outlet 12h and the foot air outlet.

However, since the guide wall 20 is provided with a concavo-convex portion 21 having a notch 21a at the tip thereof, the air flowing into the mix chamber 10 from the bypass passage 9 is corrected in its unbalanced flow, as shown in FIG. The air flowing into the driver-side blow-off duct 12d will be guided to the assist-side blow-off duct 12a, so the temperature of the air blown out from both blow-off ducts 12a and 12d will be uniform. .

Default Mode When set to the differential mode, the vent door 14 closes the vent duct 13, the switching door 22 closes the floor duct 12, and only the differential duct 11 is left open, as shown in FIG.

The air blown out from the Sirotskov fan 4 flows along the air path F, and the warm air heated through the heater core 8 and the cold air passed through the bypass passage 9 are mixed in the mixer chamber 10, and the air is mixed with the air flowing through the defer duct 1.
1.

Due to the characteristics of the Sirotskov fan 4, the cold air passing through the bypass passage 9 is
The flow of cold air that tends to flow easily to the driver side differential duct 11b is corrected, and both differential ducts 11
Warm air of approximately the same temperature is blown out from a and 11b.

In addition, when in cooler mode, the vent door 14
is fully opened and all the cold air is blown out from the vent duct 13.

The present invention is not limited to the embodiments described above, and the notch 21a of the uneven portion 21 may be formed to prevent drifting due to the characteristics of the Sirotsko fan 4, and its shape or position can be modified in various ways. It goes without saying that you can.

(Effects of the invention) As described above, according to the invention, a guide wall is provided to guide the air flowing through the bypass passage to the downstream region of the heater core, and at the tip of the guide wall,
By forming an uneven part consisting of a predetermined notch and a part without a notch, the uneven flow caused by the characteristics of the Sirotskov fan is prevented, and the temperature of the air blown out from the blow-off duct is almost equalized, allowing comfortable heating. In addition, since the air mixing performance can be improved without erecting ribs in the air passage, the ventilation resistance will not increase and the air volume will not decrease.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention;
2 is a schematic cross-sectional explanatory diagram taken along the - line in FIG. 1, FIG. 3 is a perspective view showing the main part of FIG. 1, and FIG.
The figure is a sectional view showing an example of a conventional air conditioner for an automobile, and FIG. 5 is a schematic sectional view taken along the - line in FIG. 4. 4... Sirotskov fan, 5... Fan scroll, 5a... Anti-suction side wall, 5b... Suction side side wall, 6... Discharge port, 7... Mix door, 8...
Heater core, 9...bypass passage, 10...mixture chamber, 12a, 12d...blowout duct,
20... Guide wall, 21... Uneven portion, F... Air path.

Claims (1)

[Claims for Utility Model Registration] An air passage F is formed at the discharge port 6 of the fan scroll 5 in which the Shirotsuko fan 4 is installed by extending the suction side side wall 5b and the anti-suction side side wall 5a of the fan scroll 5, In this air path F, a heater core 8
a bypass passage 9 that bypasses the heater core 8; a mix door 7 that branches part of the airflow to the heater core 8 side and the rest to the bypass passage 9 side; Mixture chamber 10
In an air conditioner for an automobile, in which blow-off ducts 12a and 12d connected to the downstream region of the mix chamber 10 are connected to through holes opened in the blow-in side wall 5b and the anti-suction side wall 5a, respectively. A guide wall 20 formed to guide the airflow flowing through the bypass passage 9 to the downstream region of the heater core 8 is formed between the side walls 5a and 5b, and the tip of the guide wall 20 is notched. An air conditioner for an automobile, characterized in that a concave-convex portion 21 is formed to guide the airflow blown out from the Shirotsuko fan 4 to the side opposite to the side where the airflow is deflected.