JPH0355445Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a motor cooling structure for an automobile air conditioner that introduces cooling air introduced by an intake unit fan into the motor casing via a cooling pipe. Regarding improvements.

(Prior Art) A conventional motor cooling structure for an air conditioner for an automobile is disclosed in Japanese Utility Model Application Publication No. 57-28010. In other words, the intake unit 1 shown in FIG. 4 includes an intake door 4 that selectively opens the inside air intake port 2 and the outside air intake port 3, and air conditioning by taking inside and outside air through the inside air intake port 2 and the outside air intake port 3. The fan 5 that is fed into the device, the motor 6 that drives the fan 5, the motor casing 7 that houses the motor 6, the fan scroll 8 that houses the fan 5, and the motor casing 7 and fan scroll 8 communicate with each other. It is composed of a cooling pipe 9.

As shown in FIG. 5, an air intake port 11 is formed in a cylindrical shape in the bottom wall 10 of the fan scroll 8. It consists of an inner protrusion 11b that protrudes to prevent water that enters when outside air is introduced from the air intake port, and an outer protrusion 11c that protrudes outward. This outer protrusion 11c and the motor casing 7
One end of the cooling pipe 9 that communicates with the fan 5 is expanded and fitted into the outer protrusion 11c, and the other end is bored into the side wall of the motor casing 7.
Cooling air is introduced into the motor casing 7 via a cooling pipe 9.

(Problems to be Solved by the Invention) However, in the conventional motor cooling structure described above, as shown in FIG. There is a flow of wind. and,
As shown in FIG. 5, when the air passing in the direction of arrow B on the intake surface 11a of the air intake port 11 flows into the air intake port 11, a vortex C is generated, and this vortex C causes what is commonly called a whistling phenomenon. Occur. Further, as shown in FIG. 7, on the circumferential surface of the air intake port 11, the inner protrusion 1
A vortex D is generated on the downstream side of 1b, and this vortex D generates sound. This whistling phenomenon generates various tones as the air velocity changes. Therefore, there is a problem in that noise is generated within the intake unit due to the whistling phenomenon described above, and this noise also leaks into the passenger compartment, causing discomfort to the occupants.

Therefore, this idea was created by focusing on the above-mentioned conventional problems, and provides a quiet motor cooling structure for automotive air conditioners by reducing the whistling phenomenon that occurs at the air intake. It is intended to.

(Means for Solving the Problems) In order to achieve the above object, this invention connects an air intake hole formed in the wall surface of a fan scroll having a fan driven by a motor and a cooling pipe to the motor casing of the motor. Connected by
In a motor cooling structure for an air conditioner for an automobile, in which the motor is cooled by introducing cooling air from the fan into the motor casing via a cooling pipe, the opening surface of the air intake port includes:
With respect to the air flow direction along the inner wall surface of the fan scroll, the upstream side is located on the same plane as the inner wall surface, and the downstream side is located outward from the inner wall surface.

(Example) Hereinafter, an example according to this invention will be described based on the drawings.

FIG. 1 is a cross-sectional view showing the motor cooling structure of the intake unit of the automobile air conditioner of this invention, and FIG. 2 is a partially enlarged cross-sectional view showing the air intake port.
FIG. 3 is a partially enlarged sectional view showing the air intake port of another embodiment.

In FIG. 1, the intake unit 21 has a fan scroll 22, and the fan 24 is disposed within the fan scroll 23 so that the axis of the fan 24 coincides with the axis of the bell mouth 23. 24 is adapted to be driven by a motor M fixed to the fan scroll 23. An outside air intake port and an inside air intake port (not shown) are provided on the outside of the bell mouth 23, and both of these ports are connected to an intake door (not shown).
The opening/closing is controlled by Also,
The downstream end of the fan scroll 22 communicates with a cooler unit (not shown).

The bottom wall 22a of the fan scroll 22 includes:
An air intake port 25 is formed, and the air intake port 25 and the motor casing 26 of the motor M are communicated with each other through an L-shaped cooling pipe 27. The cooling pipe 27 includes a vertical pipe 27a on the fan scroll 22 side and a horizontal pipe 27a on the motor M side.
A funnel-shaped water collecting portion 28 is provided at the lower part of the intersection of the vertical pipe 27a and the horizontal pipe 27b. Also, inside the water collecting section 28, a moisture absorbing material 29 made of cloth, cotton, etc. for absorbing drain water is provided.
A drain pipe 30 is connected to the lower part of the drain pipe 30 for discharging drain water that enters through the air intake port 25 to the outside of the vehicle or to the cooler unit. Further, the cooling air introduced by the fan 24 flows along the inner wall surface of the fan scroll 22 and in the direction of arrow E, that is, toward the cooler unit.

Here, the air intake port 25 will be explained based on FIG. 2. The air intake surface 25a of the air intake port 25 is on the same plane as the inner wall surface of the bottom wall 22a. The air intake port 25 projects outward from the fan scroll 22, and
An inclined portion 25b is formed which is inclined downwardly from the peripheral edge of the air intake surface 25a.
The slope distance of the slope portion 25b becomes shorter as it moves from the most downstream side portion 25c to the most upstream side portion 25d, and is finally formed to be integrated with the most upstream side portion 25d. Therefore, the lower end 25g of the inclined portion 25b forms an elliptical opening surface 25e. Further, below the opening surface 25e, a cylindrical portion 25f is formed extending downward from the lower end of the inclined portion 25b, and the vertical pipe 27a is press-fitted into this cylindrical portion 25f.

FIG. 3 shows another embodiment of the air intake port 35, in which the air intake port 35 has a cylindrical portion 35f extending outward from the bottom wall 22a of the fan scroll 22.
The upper end of the cylindrical portion 35f and the peripheral edge of the air intake surface 36 are connected by an R-shaped portion 35g.

According to the above-described configuration, when the cooling air introduced by the fan 25 is introduced into the motor casing 26, the bottom wall 22 is
Since the cooling air flowing along the direction a is easily introduced into the cooling pipe 27, and the air intake port 25 is formed in a direction substantially perpendicular to the bottom wall 22a,
Turbulence that tends to occur within the air intake port 25 can be suppressed.

It should be noted that since the water collecting part such as rainwater that enters through the air intake port 25 is absorbed by the moisture absorbing material 29,
It does not enter into the motor casing 26.

(Effects of the invention) As explained above, this invention connects the air intake port formed in the wall surface of the fan scroll having a fan driven by a motor with the motor casing of the motor through a cooling pipe, and In the motor cooling structure for an air conditioner for an automobile, the motor is cooled by introducing cooling air from the fan scroll into the motor casing through a cooling pipe. With respect to the direction of air flow along the inner wall surface, the upstream side is located on the same plane as the inner wall surface, and the downstream side is located outward from the inner wall surface, so that turbulent flow occurs at the air intake port. In addition, it is possible to suppress the whistling phenomenon. Therefore, a very excellent effect is achieved in that a quiet motor cooling structure for an automobile air conditioner can be realized.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the motor cooling structure of the intake unit of the automobile air conditioner of this invention, and FIG. 2 is a partially enlarged cross-sectional view showing the air intake port.
FIG. 3 is a partially enlarged sectional view showing the air intake of another embodiment, FIG. 4 is a longitudinal sectional view showing the motor cooling structure of a conventional intake unit, and FIG. 5 shows the air intake of FIG. 1. FIG. 6 is a cross-sectional view of the fan scroll, and FIG. 7 is an explanatory view showing vortices generated on the circumferential surface of the inner protrusion of the air intake port. M...Motor, 22...Fan scroll, 2
4...Fan, 25...Air intake, 25a...
Air intake surface, 25b... Inclined part, 25c... Most downstream side part, 25d... Most upstream side part, 25e... Opening surface, 25f... Cylindrical part, 26... Motor casing, 27... Cooling pipe .

Claims (1)

[Scope of utility model registration request] An air intake port formed on a wall surface of a fan scroll having a fan driven by a motor and a motor casing of the motor are connected by a cooling pipe, and cooling air from the fan is introduced into the motor casing through the cooling pipe. In the motor cooling structure of an air conditioner for an automobile, which cools the motor by side 25
d is located on the same plane as the inner wall surface, and the downstream side 25c is located outward from the inner wall surface.