JPH0452095Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a structure for cooling a motor provided in an intake unit.

(Prior Art) An intake unit in an automotive air conditioner is equipped with a motor that drives a fan for sending air into the vehicle interior.

This motor usually generates heat due to the contact between the commutator and the brushes and the electrical resistance of the conductors, so a fan is used to forcibly supply cooling air to cool the motor (for example , see Utility Model Publication No. 57-28010). Figures 4 and 5
This figure shows a conventional intake unit that sends forced cooling air to a motor.

As shown in FIG. 4, the case 11 of the intake unit has an outside air switching box that has an outside air intake 12 for introducing air from outside the vehicle and an inside air intake 13 for introducing air from inside the vehicle. 1
4, and a fan scroll 24 consisting of an upper case 15 and a lower case 16 is attached to the lower part of this inside/outside air switching box 14.

An intake door 17 for opening and closing the outside air intake port 12 and the inside air intake port 13 is installed in the inside/outside air switching box 14, and the fan scroll 24 has a fan 18 and a
A motor 19 for driving 8 is attached. This motor 19 is designed to rotate around a substantially vertical axis, and a fan 18
Due to the rotation of , air flows into the fan scroll 24 through the bell mouth portion 20 . This air is
Pressurized by the fan 18, the upper wall 21 and the side wall 2
2 and the bottom wall 23 to reach the discharge port 25.

The air discharged from the discharge port 25 is
It is sent to downstream unit cases such as cooling units and heater units connected to the unit.

To cool the motor, one end of the cooling pipe 27 is connected to the housing 19c of the motor 19, and the other end of the cooling pipe 27 is connected so as to slightly protrude from the air intake port 26 provided near the discharge port 25 of the bottom wall 23.
This is done by introducing a portion of the air into the housing 19c of the motor 19 through the cooling pipe 27.

As a result, as the fan 18 rotates, air toward the discharge port 25 of the fan scroll 24 passes from the air intake port 26 through the cooling pipe 27 to the motor 1.
9 into the housing 19c of the motor 19.
It returns into the fan scroll 24 from the discharge port 19a formed in the arrow as shown by the arrow. As this air circulates through the above path,
Motor 19 is cooled down.

(Problem to be solved by the invention) However, if the outside air intake port 12 is opened by the intake door 17, if snow, washing water from washing the vehicle, or dust enters the case 11, forced cooling will occur. These water droplets, dust, etc. carried by the wind flow adhere to the bottom wall 23 and enter the motor 19 from the air intake port 26 through the cooling pipe 27 along with the air, causing performance problems to the motor 19. May cause adverse effects.

The present invention was developed in view of these problems, and provides a motor cooling structure for an intake unit that circulates only clean cooling air without water droplets or dust getting into the cooling air flowing into the motor housing. The purpose is to provide.

(Means for Solving the Problems) In order to achieve this object, the present invention arranges a fan provided in a fan scroll and a motor for driving the fan so that their axes face perpendicularly, and In the motor cooling structure of the intake unit, a part of the air blown by the fan is guided into the housing of the motor by communicating the scroll and the housing of the motor via a cooling pipe. The side wall on the nose part side constituting the outlet has a double structure having an inner wall and an outer wall, and the downstream unit case is connected to the outer wall side, and a cooling air introduction chamber is formed between the inner wall and the outer wall. A motor cooling structure for an intake unit, characterized in that a cooling air intake is opened in the upper part of a partition wall separating an air introduction chamber and the unit case, and one end of the cooling pipe is connected to the cooling air introduction chamber. be.

(Function) With this arrangement, dust and the like in the air flow guided into the fan scroll by the rotation of the fan are separated by centrifugal force and discharged from the discharge port, but
This air flow is clean with a relatively high static pressure although the dynamic pressure is low near the nose, so the air that flows into the cooling air introduction chamber from the cooling air intake provided here does not contain moisture or moisture. If this air is not contaminated with dust and the like and is sent to the motor through the cooling pipe, the motor will be cooled only with clean cooling air.

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

1 to 3 show an embodiment of the intake unit according to the present invention. In these figures, the same reference numerals are given to the same members as in FIGS. Some explanations will be omitted.

As shown in the figure, the case 11 of the intake unit has an inside/outside air switching box 14 and a fan scroll 24. An intake door 17 that opens and closes the outside air intake port 12 and the inside air intake port 13 is installed in the inside/outside air switching box 14, and a motor 19 that drives the fan 18 is mounted on the fan scroll 24 so that its axis is perpendicular to the outside air intake port 14. It is arranged and installed facing the direction. Therefore, when the fan 18 is rotated by the drive of the motor 19, the air that has reached the fan 18 from the bell mouth section 20 is pushed out into the fan scroll 24, which is a spiral-shaped passage, and reaches the discharge port 25. A downstream unit case 28 such as a cooling unit or a heater unit is connected to the discharge port 25.
The air from the discharge port 25 flows into this unit case 28.
sent to.

In this embodiment, in order to supply air to the motor 19 for cooling, the side wall 29 on the nose N side that constitutes the discharge port 25 of the fan scroll 24 has a double structure having an inner wall 29a and an outer wall 29b. A downstream unit case 28 is connected to the outer wall 29b, and a cooling air introduction chamber 30 is formed between the inner wall 29a and the outer wall 29b. This cooling air introduction chamber 30 has a cooling air intake 32 that opens toward the leeward side at the top of a partition wall 31 that separates it from the unit case 28, and the air that has reached the discharge port 25 flows through the cooling air intake 32. The cooling air is introduced into the cooling air introduction chamber 30 from the inside. At the bottom of such a cooling air introduction chamber 30, a pipe portion 33 is connected to the cooling air introduction chamber 30.
This pipe portion 33 is connected to the housing 19c of the motor 19 via a cooling pipe 27.

Next, the operation of the embodiment will be explained.

When the motor 19 is driven to rotate the fan 18 while the outside air intake 12 is open by the intake door 17, air flows from the outside air intake 12 through the bell mouth portion 20 into the fan scroll 24. This air is pressurized by the fan 18, passes through the fan scroll 24, and is discharged from the discharge port 2.
5. In this case, the air flows along the outer wall 22 of the fan scroll 24, and dust, water droplets, etc. contained in the air are pushed toward the outer wall 22 of the fan scroll 24 by the centrifugal force. Therefore, the air flowing along the inner wall side of the fan scroll 24 contains almost no dust or water droplets, and some of the air flows into the cooling air introduction chamber 30 from the cooling air intake 32. Moreover, since the unit case 28 has a larger cross-sectional area than the discharge port 25, most of the high dynamic pressure components of the air are converted to static pressure components near the partition wall 31, and the static pressure becomes high. As a result, the pressure difference between the portion between the fan 18 and the motor 19, which is the discharge port side of the cooling pipe 27, becomes large, and the amount of air flowing into the cooling air introduction chamber 30 also increases. Furthermore, because the cooling air intake 32 is open at the top, water droplets and the like that are heavier than air are less likely to climb over the partition wall 31 and flow into the cooling air introduction chamber 30, and the air that flows into the cooling air introduction chamber 30 is clean air that is free of moisture, dust, and the like. As a result, only clean air is sent from the tube portion 33 through the cooling pipe 27 into the housing 19c of the motor 19,
After cooling the motor 19, the coolant is returned to the fan scroll 24 through the discharge port 19a.

(Effects of the invention) As explained above, in the present invention, the side wall of the nose part constituting the discharge port of the fan scroll has a double structure having an inner wall and an outer wall, and a cooling air introduction chamber is formed therein. Since the cooling air intake port is opened at the top of the partition wall that separates the cooling air introduction chamber from the downstream unit case, cooling air can be taken in without being affected by the dynamic pressure of the air flow, and water droplets and dust can be removed. Only clean, uncontaminated air is sent into the motor. Therefore, only cooling air free of moisture and dust is circulated inside the motor, thereby efficiently cooling the inside of the motor and improving the durability of the motor.

[Brief explanation of the drawing]

Fig. 1 is a side view from the discharge port side showing the motor cooling structure of the intake unit according to the present invention, Fig. 2 is a perspective view of the case portion of Fig. FIG. 4 is a cross-sectional view of a conventional motor cooling structure of an intake unit, and FIG. 5 is a cross-sectional view of the case portion of FIG. 4. 11... Case, 18... Fan, 19... Motor, 19c... Motor housing, 24...
Fan scroll, 25... Discharge port, 27... Cooling pipe, 28... Heater unit, 29... Nose side side wall, 29a... Inner wall, 29b... Outer wall, 30... Cooling air introduction chamber, 31... Bulkhead, 32
...Cooling air intake, N...Nose part.

Claims (1)

[Scope of utility model registration request] Fan 1 provided in fan scroll 24
8 and a motor 19 for driving the fan 18 are disposed so that their axes are oriented vertically, and the fan scroll 24 and the housing 19c of the motor 19 are communicated via a cooling pipe 27, so that air is blown by the fan 18. In the motor cooling structure of the intake unit in which a part of the air is guided into the housing 19c of the motor 19, the nose portion N side side wall 29 constituting the discharge port 25 of the fan scroll 24 is divided into an inner wall 29a and an outer wall 29b. The unit case 28 on the downstream side is connected to the outer wall side, and the inner wall 29a is connected to the outer wall side.
A cooling air introduction chamber 30 is formed between the cooling air introduction chamber 30 and the outer wall 29b, and the cooling air introduction chamber 30 and the unit case 2
A cooling air intake 32 is provided at the top of the partition wall 31 that separates the
A motor cooling structure for an intake unit, characterized in that one end of the cooling pipe 27 is connected to the cooling air introduction chamber 30.