JP2007283800A - Blower unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blower unit which effectively reduces outside air intake resistance and noise in the blower unit having two inside/outside air changing doors. <P>SOLUTION: The blower unit 1 is provided with: a unit case 2; a blower fan 4 provided in the unit case 2; an outside air inlet 5 opened in the unit case 2 to the blower fan 4; a pair of inside air inlets 6 opened opposedly on the sides of the outside air inlet 5 of the unit case 2; a pair of swing doors 9 closing the pair of inside air inlets 6 when the outside air inlet 5 is opened and closing a flow path from the outside air inlet 5 when the inside air inlets 6 are opened; and a door seal member 11 provided on this flow path to regulate the positions of the front end edges of the pair of swing doors 9 when the inside air inlets 6 are opened. The door seal member 11 has at least an air guide plate 11a extended towards the blower fan 4 in its central part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a blower unit including an inside / outside air switching mechanism.

In air conditioners and the like mounted on vehicles, blower units that reduce the size of the unit by using two inside / outside air switching doors and reduce the inside air intake resistance and noise are known (the following [Patent Document 1] and the like).
JP 2002-19453 A

  However, in this case, when the inside / outside air switching door is set to the inside air intake mode, the door seal member for positioning the door tip edge is located on the flow path during the outside air intake, so that a vortex is formed downstream of the door seal member and the outside air is There are cases in which intake resistance and noise are promoted, and improvements have been demanded. Accordingly, an object of the present invention is to provide a blower unit capable of effectively reducing outside air intake resistance and noise in a blower unit having two inside / outside air switching doors.

  The blower unit of the present invention has a unit case, a blower fan disposed in the unit case, an outside air inlet opening in the unit case toward the blower fan, and a side of the outside air inlet of the unit case. And a pair of swing doors that close the pair of internal air intakes when the external air intake is opened and that block the flow path from the external air intake when the internal air intake is open, And a door seal member that regulates the position of the leading edge of the pair of swing doors when the inside air inlet is opened, and the door seal member extends at least in the center of the wind guide plate toward the blower fan It is characterized by having.

  According to the blower unit of the present invention, the airflow guide plate of the door seal member rectifies the flow of the airflow downstream of the door seal member when the outside air is introduced, thereby preventing the generation of vortices and reducing the intake resistance and noise. Can be realized effectively. In addition, this can be realized with a simple structure in which an air guide plate is provided on the door seal member, and the cost is not increased as compared with the prior art.

  Hereinafter, an embodiment of a blower unit of the present invention will be described with reference to the drawings. The blower unit of this embodiment is a blower unit built in an air conditioner unit mounted on a vehicle. FIG. 1 is a cross-sectional view of the blower unit of the present embodiment, which is cut in a direction perpendicular to the rotation axis of the inside / outside air switching door and through the rotation axis of the blower fan. 2 is a cross-sectional view taken along line II-II in FIG. 1 and 2, details of the interior of the motor that drives the blower fan and the interior of the actuator that drives the switching door are not shown. In FIG. 2, the switching door is not shown in order to make the drawing easier to see.

  The blower unit 1 has an air filter 3 and a blower fan 4 inside a unit case 2. The unit case 2 includes an upper case 2a formed with an outside air intake 5 and a pair of inside air intakes 6, an intermediate case 2b formed integrally with a bell mouth 7 disposed around the blower fan 4, It consists of a blower fan 4 and a lower case 2c to which a motor 8 for driving the blower fan 4 is attached.

  In the upper part of the unit case 2, an outside air intake 5 that is opened substantially perpendicularly to the suction direction of the blower fan 4 is opened. A duct (not shown) is connected to the outside air inlet 5, and fresh air outside the vehicle is introduced. A pair of internal air intakes 6 are opened on the side surfaces of the unit case 2 on the side of the external air intake 5 so as to be substantially opposed to each other. The interior air intake 6 is open to the vehicle interior and introduces vehicle interior air. The inside air intake 6 has a crosspiece that suppresses entry of foreign matter into the unit case 2.

  An air filter 3 is disposed below the pair of inside air inlets 6. The air filter 3 is sandwiched and fixed between the upper case 2a and the intermediate case 2b. Below the air filter 3, a bell mouth 7 that guides the air sucked into the blower fan 4 is disposed. A blower fan 4 is disposed inside the bell mouth 7. The blower fan 4 sucks air from the axial direction through the opening of the bell mouth 7 and discharges it from the surroundings. Air discharged from above the intermediate case 2b to the lower space of the intermediate case 2b by the blower fan 4 is guided downstream by a duct (not shown).

  Next, the pair of outside / inside air switching doors (swing doors) 9 will be described. In the blower unit 1, as described above, the air to be sucked can be switched between outside air and inside air. As shown in FIG. 1, a pair of switching doors 9 for performing this switching is disposed in the vicinity of each inside air inlet 6. FIG. 1 shows a state in which the inside air intake 6 is closed by the switching door 9. In this way, the internal air intake 6 is divided into two parts and is opened and closed by the pair of switching doors 9, thereby ensuring the necessary opening area for taking in the internal air and the size of the blower unit 1 ( The unit can be downsized with a particularly low height.

  Each switching door 9 is provided with a rotating shaft at the upper edge (outside air intake 5 side) of the switching door 9 and swings around the edge. This operation of each switching door 9 is performed by the actuator 10 shown in FIG. By swinging the switching door 9 as indicated by a one-dotted line in FIG. 1, the internal air intake 6 can be opened and the flow path from the external air intake 5 can be closed. When the internal air intake 6 is opened, the air sucked from the internal air intake 6 is guided by the inclination of the switching door 9 and flows downward, and after passing through the air filter 3, the air is passed to the blower fan 4 via the bell mouth 7. Inhaled.

  Further, the position of the front edge of the pair of switching doors 9 is restricted above the air filter 3 when the inside air intake 6 is opened, and the space on the outside air intake 5 side and the space on the air filter 3 side are sealed. A door seal member 11 is provided. The door seal member 11 is disposed on the air flow path from the outside air inlet 5 in a state where the outside air inlet 5 is open (state shown in FIG. 1). For this reason, in order to reduce the intake resistance as much as possible, the upper end edge has an inverted U-shaped cross section.

  And the door seal member 11 has the baffle plate 11a suspended perpendicularly | vertically with respect to the air filter 3 surface. Without this air guide plate 11a, a vortex is generated on the downstream side of the door seal member 11, which causes intake resistance and causes intake noise. Therefore, here, the air flow is rectified by the baffle plate 11a, and the generation of vortices on the downstream side of the door seal member 11 is suppressed, thereby reducing the intake resistance and the intake noise.

  It is preferable that the air guide plate 11a is provided up to the full width of the blower unit 1 as in the present embodiment. However, when the opening size of the outside air intake is small, the air guiding plate 11a has a width larger than that of the outside air intake. An effective effect is obtained. Considering the air flow from the outside air intake, it is effective if it is at least at the center (the outside air intake and the blower fan are not largely offset, so the center of the seal member is almost Because most air flows in

  Furthermore, if there is little protrusion amount of the baffle plate 11a, the effect which suppresses generation | occurrence | production of a vortex will decrease. For this reason, with respect to the width W of the door seal member 11, it is preferable that the protrusion amount of the air guide plate 11a from the door seal member 11 main body (inverse U-shaped section) satisfies the relationship L> W. When L ≦ W, the amount of protrusion of the air guide plate 11a is too short to rectify the air flow, and it becomes difficult to suppress the generation of vortices. The distance D from the tip of the air guide plate 11a to the edge of the bell mouth 7 preferably satisfies the relationship D> 25 mm. When D ≦ 25 mm, there is no space when the air filter 3 is provided between the air guide plate 11 a and the bell mouth 7, and even when no air filter is provided, the air guide is provided when D ≦ 25 mm. Since the space between the plate 11a and the bell mouth 7 is too close, there is a risk of increased intake resistance and noise due to airflow interference.

It is sectional drawing in one Embodiment of the blower unit of this invention. It is the II-II sectional view taken on the line in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Blower unit 2 Unit case 2a Upper case 2c Lower case 2b Intermediate case 3 Air filter 4 Blower fan 5 Outside air intake 6 Inside air inlet 7 Bell mouth 8 Motor 9 Switching door (swing door)
10 Actuator 11 Door seal member 11a Air guide plate

Claims (3)

Unit case (2),
A blower fan (4) disposed in the unit case (2);
An outside air inlet (5) opened in the unit case (2) toward the blower fan (4);
A pair of internal air intakes (6) opened to face the outside air intake (5) of the unit case (2);
A pair of swing doors that closes the pair of internal air intakes (6) when the outside air intake (5) is open, and closes the flow path from the outside air intake (5) when the internal air intake (6) is open ( 9)
A door seal member (11) disposed on the flow path and restricting the position of the front edge of the pair of swing doors (9) when the inside air intake (6) is opened;
The blower unit, wherein the door seal member (11) has an air guide plate (11a) extending toward the blower fan (4) at least in the center thereof.   The blower unit according to claim 1, wherein the air guide plate (11a) is formed over a width of the outside air inlet (5).   A bell mouth (7) is disposed around the blower fan (4), the width of the door seal member (11) is W, and the air guide plate (11a) protrudes from the body of the door seal member (11). L> W and D> 25 mm, where L is the amount, and D is the distance from the tip of the air guide plate (11a) to the edge of the bell mouth (7) introduction side. The blower unit according to claim 1 or 2.

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