JPH0231296Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an intake unit in which air is introduced into a motor attached to a case of the intake unit to cool the motor.

(Prior Art) An intake unit in an automobile air conditioner has a fan for sending air into a vehicle interior, and a motor that drives this fan is attached to a case of the intake unit.

Since the motor normally generates heat due to contact between the commutator and the brushes that supply power to the armature through this, as shown in Japanese Utility Model Publication No. 56-23126, the motor is forced to It is designed to supply cooling air to the FIGS. 8 and 9 are diagrams showing a conventional intake unit configured to send forced cooling air to the motor in this manner.

As shown in the figure, the case 1 of the intake unit is integrated with an inside/outside air switching box 4 having an outside air intake 2 for introducing air from outside the vehicle and an inside air intake 3 for introducing air from inside the vehicle. It consists of a bent upper case 5 and a lower case 6 joined to this upper case 5. A motor 8 for driving a fan 7 provided inside the case 1 is attached to the lower case 6. By driving this motor 8, air flows into the fan 7 through a bell mouth 9 provided in the upper case 5. This incoming air is pressurized by the fan 7 and the upper case 5
Top wall 10 and bottom wall 11 and side wall 12 of the lower case 6
As a result, as shown in FIG. 9, the fan scroll 13 formed in the case 1 is pushed out into a plane spiral shape, and reaches the discharge port 14. Further, an intake door 15 is installed inside the switching box 3 to open and close the outside air intake port 2 and the inside air intake port 3. In order to supply air for cooling the motor 8, a pipe section 16 is formed on the outside of the lower case 6, and a hose 17 is connected between the pipe section 16 and the housing of the motor 8.

As a result, as the motor 8 is driven and the fan 7 rotates, air directed toward the discharge port 14 of the case 1 flows into the motor 8 through the air passage 18 in the pipe portion 16 and enters the housing of the motor 8. The discharge port 19 returns to the case 1 as shown by the arrow, and the motor 8 is cooled. However, when the intake door 15 is set to the position shown in the figure and the outside air intake 2 is opened and the inside air intake 3 is closed, if rainwater, snow, or washing water from washing the vehicle enters the case 1, These water droplets may enter the motor 8 through the air passage 18. Therefore, since it is thought that the water droplets that have entered the case 1 mainly accumulate on the bottom wall of the case 1, conventionally the air passage 18 is
An opening 20 into the case 1 is formed in the side wall above the bottom wall 11.

(Problem to be solved by the invention) In such a conventional intake unit, if water droplets should enter the case 1 from the bell mouth 9, the water droplets would be scattered radially by the fan 7 until they hit the side wall 12. The case 1 is moved along the side wall 12 by the air flowing inside the case 1.
The liquid will flow toward the discharge port 14 of. Then, the amount of water droplets increases as the side wall 12 approaches the discharge port 14, and some of the water droplets will also diffuse upward along the side wall due to wind pressure. Therefore, even if the opening 20 is formed in the upper part of the side wall 12, water droplets that have reached the opening 20 along the side wall 12 may enter the air passage 18.

In view of the above-mentioned problems of the prior art, the present invention has been developed to supply high-pressure air pushed out by the fan in the intake unit to the motor for driving the fan, and to cool the motor in the event that the intake unit The purpose of this invention is to prevent water droplets from entering the air flow path that guides cooling air to the motor even if water droplets enter the motor.

(Means for Solving the Problems) The present invention for achieving the above object includes: attaching a motor for driving the fan to an intake unit case that houses the fan; and guiding air in the case to the motor. In the intake unit, a bulge is formed in the case by bulging a side wall of the case to the outside, and air located above the side wall inside the case is formed in a housing space of the bulge. A pipe having an introduction opening and an air discharge opening located outside the case is interposed with a predetermined distance between the pipe and the side wall of the bulge, and is substantially flush with the side wall other than the bulge. The intake unit is characterized in that water that has entered the case and flows along the side wall of the case is guided between the pipes so that only air flows into the pipe.

(Function) In the present invention configured as described above, water droplets that entered the case of the intake unit with the inflow of air flow along the side wall of the case, and then flow through the bulge formed on the side wall. When the temperature reaches 1, the water will flow together with the air through the space between the pipe and the side wall of the bulge, and the water droplets that flowed along the side wall may enter the air passage in the pipe from the air introduction opening. It disappears.

(Example) Next, the illustrated example of the present invention will be described. 1 and 2 are diagrams showing an intake unit according to an embodiment of the present invention, and in these figures, parts common to those in FIGS. 9 and 10 are given the same reference numerals.

As shown in the figure, a case 1 of an intake unit housing a fan 7 is comprised of an upper case 5 and a lower case 6, and a motor 8 for driving the fan 7 is attached to the lower case 6. Therefore, when the fan 7 is rotated by the drive of the motor 8, the air that reaches the fan 7 from the bell mouth 9 is
It is pushed out by the fan 7 into the fan scroll 13, which is a spiral-shaped chamber inside the case 1, and reaches the discharge port 14.

Inside the case 1, a pipe 21 is provided at a position on the downstream side of the fan scroll 13, passing through the bottom wall 11. Introduction opening 2
2, and further has an air discharge opening 23 located outside the case 1. A gap 24 is interposed between the pipe 21 and the side wall 12 of the case 1. In the illustrated embodiment, a portion of the side wall 12 corresponding to the pipe 21 is bulged outside so that the pipe 21 provided in the case 1 does not act as a resistance to the air flowing through the fan scroll 13.
A pipe 21 is provided in a housing space 26 formed in the case 1 by the bulge 25 . Furthermore, as shown in the figure, this pipe 21 has a semicircular cross-sectional shape on the outer periphery, and the flat side faces the fan scroll 13, so that the air inside the fan scroll 13 can flow smoothly. There is.

One end of the hose 17 is attached to the discharge part of the pipe 21 in which the air discharge opening 23 is formed,
The other end of this hose 17 is attached to the housing of the motor 8.

Therefore, even if water droplets enter the fan 7 with the inflow of air from the bell mouth 9, the water droplets are pushed out in the centrifugal direction by the fan 7, and most of the water droplets hit the side wall 12 of the case 1, and the water droplets enter the fan 7.
It flows toward the discharge port 14 along.
Water droplets flowing along the side wall 12 flow through the scroll nose portion N where the distance between the fan 7 and the side wall 12 is the narrowest.
Therefore, the number of water droplets gradually increases toward the rear side of the side wall 12 in the direction of rotation of the fan 7, but these water droplets flow along the side wall 12 following the air flowing inside the fan scroll 13. After
When reaching the bulge 25 formed on the side wall 12, water droplets tend to flow along the wall while remaining attached to the wall. 24, and the water droplets flowing along the side wall 12 will not enter the air passage 27 in the pipe 21 from the air introduction opening 22. In this way, the water droplets flowing along the side wall 12 are detoured through the gap 24 at the bulging portion 25, so the water droplets flow at a position away from the opening 22, and the water droplets flow into the motor 8. This will prevent infiltration.

3 and 4 are views showing an intake unit according to another embodiment of the present invention. In this embodiment, the bottom wall 11 of the lower case 6 in the portion where the bulging portion 25 is formed is stepped. The bottom is raised.
Thereby, the total length of the pipe 21 protruding into the case 1 from the bottom wall 11 of the lower case 6 is shortened.
Note that the other structures are the same as in the above embodiment,
The same reference numerals are given to parts common to those in the previous embodiment. In addition, air introduction opening 22
As shown in FIG. 3, a rectangular notch 22b is formed at the end of the pipe 21, as shown in FIG. It has been done.

FIG. 5 is a diagram showing an intake unit according to still another embodiment of the present invention; in this case, the first
The cross-sectional shape of the pipe 12 in the intake unit shown in FIGS.

In each of the embodiments described above, the bulge 25 is provided on the rear side of the side wall 12 in the direction of rotation of the fan 7.
However, as shown in FIGS. 6 and 7, the bulge 25 can be formed at any position. FIG. 6 shows that a bulging portion 25 is formed on the side wall 12 of the scroll nose portion N on the side of the discharge port 14,
A pipe 21 is provided within a housing space 26 formed by the bulge 25, separated from the side wall 12 by a gap 24. In the intake unit shown in FIG. 7, the bulge shown in FIGS. A bulging portion 2 is located at an intermediate position between the position of the portion 25 and the scroll nose portion N.
5 is formed, and a pipe 21 is provided at this portion via a gap 24 from the side wall 12. In this way, when the intake unit is installed in a vehicle, the position where the pipe 21 is provided is such that the bulge is located at a position where there is no interference between the bulge 25 and other equipment, taking into consideration the relationship with other equipment. 25 is arbitrarily determined.

(Effects of the invention) As described above, according to the invention, water droplets that enter the case of the intake unit and flow along the side wall of the case are removed from the air intake pipe for guiding the air inside the case to the motor. Since the opening is located at a distance from the side wall, the water is separated from the opening and flows through the gap between the side walls, preventing water droplets from entering the motor from the pipe. This has the excellent effect of making it possible to extend the service life of the motor.

Moreover, even if such a pipe is provided within the intake unit, the air flow will not be extremely disturbed and therefore the flow resistance will not become large.

[Brief explanation of the drawing]

FIG. 1 shows an intake unit according to an embodiment of the present invention. FIG. 2 is a sectional view taken along the - line in FIG. 3 shows a perspective view of the lower case, FIG. 4 shows a sectional view, and FIGS. 5 to 7 show the lower part of the intake unit according to other embodiments of the invention, respectively. A plan view showing the case, FIG. 8 is a sectional view showing a conventional intake unit, and FIG. 9 is a cross-sectional view showing the conventional intake unit.
It is a sectional view taken along the - line in the figure. 1...Case, 7...Fan, 8...Motor,
12...Side wall, 21...Pipe, 22...Air introduction opening, 23...Air discharge opening, 24...〓
Between, 25... bulge, 26... housing space.

Claims (1)

[Scope of utility model registration request] A motor 8 for driving the fan 1 is attached to an intake unit case 1 that houses the fan 7,
In the intake unit configured to guide air in the case 1 to the motor 8, a bulge 25 is formed in the case 1 by bulging the side wall 12 of the case 1 to the outside, and the bulge A pipe 21 having an air introduction opening 22 located above the side wall 12 in the case 1 and an air discharge opening 23 located outside the case 1 is inserted into the accommodation space 26 of the part 25 and connected to the expanded part 25. A predetermined gap 24 is interposed between the side wall 12 of the case 25 and the side wall 12 of the case 1 is provided so as to be substantially flush with the side wall 12 other than the bulged portion 25. The water flowing along the
An intake unit characterized in that only air is guided into the pipe 21.