JPS61143212A - Blower device for automobile - Google Patents

Abstract

PURPOSE:To prevent the intrusion of rainwater and to increase the air amount for cooling by providing an airflow shielding wall within a blower case, and providing the air intaking port for air passages which is opened downwardly in the upper portion of an upstream side against the airflow. CONSTITUTION:Air within a blower 2 is expelled to the circumference portion within a case 1 by the centrifugal force generated by the rotation of a blower 2, and it is directed to a blow-off port 1b along the spiral shape of the case 1. And the outside air is drawn in from an inlet port 1a in the central portion of the blower 2. A part of the airflow impinges on a shield wall 4c to convert a flow direction to an upper direction and a lower direction. The upper direction airflow enters into a duct 4, and it is blown-off into the housing 3b of a motor 3 to cool the motor 3. At this time, the moisture which is drawn in together with the outside air is separated when it impinges on the shield wall 4c, and it is blown-off together with the lower direction airflow. Thus, it is possible to prevent the intrusion of rainwater and to sufficiently cool the motor.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an automobile blower device used for ventilation or air conditioning of the interior of an automobile.

(Prior Art) In general, a blower device for an automobile is often operated continuously while the automobile is in use for ventilation, air conditioning, etc. in the vehicle interior. For this reason, the motor that rotates the blower tends to reach high temperatures, and in order to avoid this, it is necessary to send cooling air into the housing of the motor.

By the way, inside the blower case that houses the blower, the air pressure is higher at the periphery than at the center due to the action of the blower, so if an air passage is provided that communicates the periphery with the inside of the housing, the blower Air within the case will naturally be drawn into the housing.

Various types of automobile blower devices are known that use this principle to send cooling air into the motor housing to cool the motor. There is something like that.

In this device, a blower is housed in a blower case, a motor for rotationally driving the blower is provided through the blower case, and the other end of a motor cooling air passage is opened at one end into the housing of the motor. 1) It is connected to the air intake port opened in the side wall of the blower case.

On the other hand, the passage that introduces outside air into the blower device from outside the car is designed to prevent rainwater, snowflakes, etc. from being sucked into the blower case, but it is not possible to completely cut off even water droplets. , it is inevitable that some water droplets will be sucked into the blower case.

However, if these water droplets enter the housing through the motor cooling air passage, the blower may malfunction due to rust formation within the motor or freezing of the motor at low temperatures.

(Problem to be Solved by the Invention) Therefore, in the conventional device of the above example, the motor cooling air intake is opened in the side wall of the blower case, where there are relatively few flying water droplets, and the cooling air is drawn from this part. Although water droplets are introduced into the air passageway to prevent water droplets from entering the housing, the effect is insufficient and the blower malfunction is unavoidable.

Furthermore, since the opening in the side wall is used as the air intake and there is nothing to prevent water droplets from entering directly, the pressure of the airflow inside the blower case is actively utilized to provide a sufficient amount of cooling air. There was also the problem that it was not possible to adopt a configuration in which the device was introduced into the housing.

In addition, other conventional devices have the same problem as the conventional device because the motor cooling air intake is only opened at a position away from the floor of the blower case where water tends to accumulate. .

(Means for Solving the Problems) The present invention has been made to solve the problems of such conventional devices. A shielding wall is provided for blocking the air flow, and an air intake port of the air passage is provided above the shielding wall on the upstream side with respect to the air flow.

(Function) In the blower device of the present invention configured as described above, the water droplets sucked into the blower case flow toward the outlet along with the airflow generated by the blower, and a part of them impinge on the shielding wall together with the airflow. At this time, the airflow changes its direction along the wall surface of the shielding wall, and some of it heads toward the air intake of the air passage provided downward in front of the wall surface, but since the water droplets have a large mass, their inertia causes them to move toward the shielding wall. It comes into contact with the wall surface and adheres to the wall surface. Therefore, gas-liquid separation occurs due to the wall surface, and most of the water droplets are removed from the airflow toward the upper air intake port.

Further, any water droplets remaining in this upward airflow also fall due to their own weight, so the amount of water droplets that enter the air passage from the air intake port is so small that it can be ignored in practice.

Moreover, a large amount of air can be introduced into the air passage from the air intake port due to the pressure of the airflow whose direction is changed along the wall surface.

(Example) Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 shows an embodiment of a blower device for an automobile according to the present invention, in which reference numeral 1 indicates a blower case, 2 indicates a blower, and 3 indicates a motor.

The blower case 1 has a substantially spiral shape that spreads horizontally, and has an air intake port 1a at a position corresponding to the center of the spiral on the upper wall, and an air outlet 1a at a position corresponding to the outermost edge of the spiral on the side wall.
b is provided and fixed in the body of an automobile (not shown), and a car body opening (not shown) is connected to the air intake port 1a so that outside air can be introduced.

The blower 2 is disposed within the blower case 1 with its center generally aligned with the air intake port 1a of the blower case 1, and the motor 3
is fixed to the lower wall of the Pro 7 case 1 at a position opposite to the air intake port 1a, with its rotating shaft 3a standing upright and penetrating upward, and the rotating shaft 3a is inserted into the center of the blower 2. .

4 is a duct (static passage) that sends cooling air to motor 3
Then, the tip 4a of the horizontal portion is opened into the housing 3h of the motor 3 so as to form a substantially ``5'' shape. In addition, by aligning the vertical part of the duct 4 with the side wall 1c near the air outlet 11 of the blower case 1, and bending the upper part of the vertical part into an inverted U shape, the tip 4b of the duct 4 is attached to the side wall 1c near the air outlet 11 of the blower case 1. It is inserted into the blower case 1 from the two ends and opened downward to form an air intake port.

This duct 4 opened downward inside the blower case j
The tip portion 4b is cut at an angle so that it becomes lower as it approaches the air outlet 1b. As a result, the part of the duct 4 wall that is closer to the air outlet 1b and the part of the duct 4 wall that is farther from the air outlet 11), from the height corresponding position to the lower end, absorbs a part of the airflow generated by the blower 2. This becomes a shielding wall 4c. Therefore, by increasing the angle of inclination at which the duct 4 is cut, the area of the shielding wall 4c can be increased.

Further, a slit 4d is provided in this shielding wall 4c from its lower end. The length of the wall (4d) is the length up to the end of the shielding wall 4cl, and the width is the minimum that allows water droplets to be pushed behind the wall by wind pressure, and it is slightly curved at the lower end.

In the apparatus of this embodiment configured as described above, when the motor 3 is energized, the motor 3 drives the blower 2 to rotate. As a result, the air that was inside the blower 2 is driven out to the periphery inside the blower case 1 by centrifugal force, and becomes an airflow that heads toward the air outlet 1b along the spiral shape of the case 1. Furthermore, outside air is sucked into the center of the blower 2 through the air intake port 1a. Since this action is performed continuously, the device can continuously draw in outside air and blow it out into the vehicle interior to ventilate or air condition the interior of the vehicle.

Here, a part of the air current changes direction upon hitting the shielding wall 4c, and is divided into upper and lower parts along the wall surface of the shielding wall 4c. The upward airflow is directed to the tip 4b of the duct 4.
It flows into the duct 4, passes through the duct 4, and blows out into the housing 3b of the motor 3. By sufficiently cooling the motor 3 with this large amount of cooling air,
Overheating due to continuous operation can be reliably prevented.

By the way, if water droplets are mixed into the outside air and sucked into the blower case 1 along with the outside air, these water droplets will also be sucked into the blower 2.
receives a centrifugal force from the air, flies along with the air current, and a part of it hits the shielding wall 4c along with the air current. At this time, the airflow is divided into upper and lower parts along the wall surface of the shielding wall 4c as described above.
Since the water droplet has a large mass, it comes into contact with the wall surface due to inertia and sticks to the wall surface. That is, gas-liquid separation occurs due to the shielding wall 4c. Therefore, most of the water droplets are removed from the airflow toward the tip 4b of the duct 4, and the remaining water droplets fall due to their own weight, so the amount of water droplets that enter the duct 4 is actually negligible. becomes.

Further, when the water droplets adhering to the wall surface of the shielding wall 4c gather, their own weight increases and they naturally fall and are removed, and are also blown off by the airflow directed downward along the wall surface.

Furthermore, in this embodiment, the shielding wall 4c is
d, the water droplets adhering to the wall surface of the shielding wall 4c are pushed out behind the wall surface by the pressure of the airflow, so that the water droplets can be more quickly removed from the wall surface, and the water droplets that have adhered to the wall surface of the shielding wall 4c can be expelled from the wall surface more quickly. Entry of water droplets can be more effectively prevented.

Here, an experiment was conducted in which the device of the above embodiment and the conventional device were each mixed with 4.5 m3 of air per minute and 70 cc/min of water droplets were inhaled for 5 minutes. As a result of investigating the amount of water that had entered, it was 20 to 30 cc in the conventional device, whereas it was as small as about 0.05 cc in the device of Example 1. From this result as well, the gas-liquid separation effect of the shielding wall 4c of the apparatus of the above embodiment is clear.

In the above embodiment, the slit 4d is provided in the shielding wall 4c.
is provided to improve the drainage performance of the wall surface of the shielding wall 4c, but even if holes are provided in the wall surface and attached water droplets are discharged from the hole after the wall surface, the drainage performance of the shielding wall 4c is improved. can be improved.

(Effects of the Invention) Thus, the blower device of the present invention can introduce a large amount of air into the air passage by actively utilizing the pressure of the air flow generated by the blower, and a sufficient amount of cooling air can be introduced into the motor housing. This can effectively prevent the motor from overheating due to continuous operation. In addition, even if a large amount of air is introduced into the air passage as described above, water droplets mixed in this air can be reduced to a practically negligible level, so water droplets may accumulate inside the housing and cause damage to the motor. It is possible to reliably prevent the blower from malfunctioning due to rust formation or water droplets freezing at low temperatures and making the motor unable to rotate.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of an automobile blower device of the present invention, and FIG. 2 is a view taken in the direction of arrow A in FIG. 1-Blower case 1a-Air inlet 1b-Air outlet IC-Side wall 2-Blower
3-Motor 3a-Rotating shaft 3b-Housing 4-・Duct (air passage) 4a-Tip 4h-
Tip (air intake) 4cm - Shielding wall 4d - Slit 8 Planer

Claims (1)

[Scope of Claims] 1. A blower, a blower case that houses the blower, a motor that rotationally drives the blower, and an air passage that guides cooling air for the motor from inside the blower case into the housing of the motor. In the blower device for an automobile, a shielding wall is provided in the blower case to block a part of the airflow in the case, and an air intake of the air passage is provided above the shielding wall on the upstream side with respect to the airflow. An automobile blower device characterized by having an inlet opening downward. 2. The blower device for an automobile according to claim 1, wherein the shielding wall is provided with a slit for draining water.