JPH051448Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial field of application) The present invention is an air conditioner for an automobile, in particular, an air conditioner that uses air outside the vehicle (hereinafter simply referred to as outside air) and air inside the vehicle (hereinafter simply referred to as inside air). This invention relates to improvements to selectively introduced intake units.

(Prior Art) In an air conditioner for an automobile, a conventional intake unit has a fan scroll part 2 in which a blower 1 is housed, as shown in FIG. A blower 1 is driven by a motor 3. The inside/outside air switching part 4 attached to the upper part of the fan scroll part 2 is formed with an outside air suction port 5 through which outside air flows and an inside air suction port 6 through which inside air flows. Mouth 5,
An intake door 7 that opens and closes the intake door 6 is provided. The air that flows into the inside/outside air switching section 4 from each of these suction ports 5 and 6 flows into the scroll body 2a through a bell mouth 8 formed in the fan scroll section 2, and is transferred to the cooler unit or heater unit by the blower 1. It is then discharged into the passenger compartment. Note that a cooling hose 9 is provided between the scroll body 2a and the casing of the motor 3 to introduce air for cooling the motor.

(Problem to be solved by the invention) In such a conventional intake unit, in order to prevent blower noise from being radiated toward the occupants, the inside air intake port 6 faces the dash panel that partitions the passenger compartment and the engine room. In most cases, there is only one inside air suction port 6.

Therefore, when trying to increase the size of the blower 1 and motor 3 to take in a large amount of air and improve cooling performance while introducing inside air, since there is only one inside air suction port 6, the inside air suction resistance is large and the inside air is This makes it difficult for air conditioners to circulate, which is one reason why it is not possible to improve cooling performance.

Furthermore, since the air that has flowed into the inside/outside air switching section 4 is caused to flow so that its streamlines are bent when passing through the bell mouth 8, the air that has flowed into the inside/outside air switching section 4 is There is also the problem that turbulence occurs and this turbulence generates noise.

Note that Japanese Patent Publication No. 58-7488 discloses an intake unit provided with an auxiliary internal air intake port and an auxiliary damper, but in this intake unit, the auxiliary internal air intake port and the bell can be connected by simply opening and closing the auxiliary damper. Since there is a step between the intake unit and the surface of the mouse, and turbulence is likely to occur in this part, the noise generated by the air flow within this intake unit is completely ignored.

The present invention has been made to solve the drawbacks and problems associated with the above-mentioned prior art, and its purpose is to reduce the internal air suction resistance of the intake unit and the noise propagating into the vehicle interior.

[Structure of the invention] (Means for solving the problem) The present invention for achieving the above object consists of a fan scroll part having a bell mouth for introducing air and accommodating a blower driven by a motor, and a fan scroll part for housing a blower driven by a motor, and In an intake unit having an inside/outside air switching section formed with a mouth and an inside air suction port and provided with an intake door for opening and closing both the suction ports,
An auxiliary internal air suction port is provided in the internal/external air switching section, and a rotation axis is provided on the auxiliary internal air suction port on the side near the bell mouth of the auxiliary internal air suction port. The intake unit is characterized in that an auxiliary damper is provided which reaches the mouth edge of the bell mouth and serves as a guide wall for guiding air from the auxiliary internal air intake port to the bell mouth of the fan scroll portion.

(Function) By opening the auxiliary inside air suction port in the intake unit, the amount of air when introducing inside or outside air can be further increased, and the air flowing from this auxiliary suction port passes through the auxiliary damper and flows into the bell mouth. Therefore, turbulence can be prevented and noise generation can be controlled.

(Example) Hereinafter, the illustrated example of the present invention will be described.

FIG. 1 is a diagram showing an embodiment of an intake unit according to the present invention, and members common to those of the conventional intake unit shown in FIG. 3 are given the same reference numerals, and their explanations will be omitted.

This intake unit 10 has an internal/external air switching section 4.
An auxiliary internal air suction port 11 is provided in one side wall 4a, and an auxiliary damper 12 is provided in the auxiliary internal air suction port 11.

The auxiliary damper 12 is provided with a rotating shaft 13 on the side of the auxiliary inside air suction port 11 near the bell mouth 8, and is pivotally supported so as to open and close the auxiliary inside air suction port 11. When the auxiliary inside air suction port 11 is opened, the tip of the auxiliary damper 12 is configured to reach the mouth edge of the bell mouth 8, and the air flowing in from the auxiliary inside air suction port 11 flows into the auxiliary damper 12. Flows along the surface of the auxiliary internal air inlet 1
1 and the bell mouth 8 is covered to serve as a guide for smoothly flowing into the bell mouth 8.

The auxiliary damper 12 may be opened and closed, for example, by providing a separate lever on a controller installed in the instrument panel of an automobile, and opening and closing the auxiliary damper 12 at a desired time by operating this lever. Considering that the controller is equipped with a large number of levers, automatic opening and closing is preferable. For example, the auxiliary damper 12 may be automatically opened when the amount of air introduced into the intake unit is insufficient in the cooler mode and cooling performance is not improved, or when the heated inside air in the passenger compartment is opened in the heater mode. One example is when the air is mixed with cold outside air and inhaled to improve heating performance. In order to operate the auxiliary damper 12 in such a case, the mode state or the difference between the set temperature and the actual temperature is detected by a sensor or mode lever position detection switch, etc., and the negative pressure attached to the auxiliary damper 11 is activated. An operation signal may be output to an actuator or an electric actuator (none of which is shown). In this way, desired air conditioning performance can be automatically obtained.

In the embodiment described above, the auxiliary internal air suction port 11 is
As shown by the solid line in the figure, it is opened toward the passenger side, but if it is opened in the position shown by the dashed-dotted line in the figure, that is, in a position facing the darts panel P, it will have a high noise prevention effect. will be obtained.

[Effects of the invention] As described above, according to the invention, an auxiliary inside air suction port and an auxiliary damper that serves as a guide when introducing inside air are provided on the side wall of the inside/outside air switching section of the intake unit, so that a large amount of inside air can be extracted. In addition, since the air flowing in from this auxiliary internal air intake port flows along the auxiliary damper, it flows in without bending, thereby preventing the generation of noise due to turbulent flow. I can do it. Furthermore, the practical effect of being able to increase the amount of internal air introduced without increasing the size of the blower and motor is also achieved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a sectional view showing a conventional intake unit. 1...Blower, 2...Fan scroll section, 3
... Motor, 4 ... Inside and outside air switching unit, 5 ... Outside air suction port, 6 ... Inside air suction port, 7 ... Intake door, 8 ... Bell mouth, 11 ... Auxiliary inside air suction port, 12 ... Auxiliary Damper, 13...Rotation axis.

Claims (1)

[Scope of utility model registration request] A fan scroll part 2 having a bell mouth 8 for introducing air and accommodating a blower 1 driven by a motor 3, an outside air suction port 5 and an inside air suction port 6 are formed, and both of the suction ports 5 and 6 are opened and closed. In an intake unit having an inside/outside air switching section 4 provided with an intake door 7, an auxiliary inside air suction port 11 is provided in the inside/outside air switching section 4, and a rotating shaft 13 is connected to the auxiliary inside air suction port 11 for inlet of auxiliary inside air. Mouth 1
The auxiliary inside air suction port 11 is opened and closed, and when opened, the tip reaches the mouth edge of the bell mouth 8, and the air from the auxiliary inside air suction port 11 is transferred to the fan scroll portion 2.
An intake unit characterized by being provided with an auxiliary damper 12 serving as a guide wall leading to a bell mouth 8.