JPS6185216A - Intake unit - Google Patents

Abstract

PURPOSE:To obtain necessary volume of cooling air and to prevent invasion of rainwater on the above heading intake unit for the air-conditioning system of motorcars, by providing an opening on the side wall of a fan scroll and at the position within the appointed range of fan rotational direction, and by connecting it to the inside of the scroll case with piping. CONSTITUTION:Providing an opening 20 on the range between 0 deg. and 210 deg. of the angle theta of rotational direction of a fan 7, based on the position of the straight line R which connects the rotational center of the fan 7 and the nose N, the inside of the case and the fan motor are connected through an air pas sage way 18 in a tube 16 which is provided on the outside of the case side wall. On this constitution, there is no invasion of rainwater between the range of 0 deg. and 210 deg. from the opening 20, therefore optimum volume of cooling air is maintained and invasion of rainwater can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an intake L-knit in which air is introduced into a motor attached to a case of an intake unit to cool the motor. .

(Prior art) Inch-cuconite in automotive air conditioners is
It has an 11C fan that blows air into the passenger compartment.
A motor that drives this fan is attached to the case of the intake unit.

Since the motor normally generates heat due to contact between the commutator and the brushes used to supply power to the Amachi core via the commutator,
As shown in the publication, the motor is forced to cool TiIp.
I am trying to supply iI. FIG. 7.8 is a diagram showing a conventional intake unit configured to send forced cooling air to the motor in this manner.

As shown in the figure, case 1 of index units 1~
An inside/outside air switching box 4 having an outside air intake 0.2 for introducing air from outside the vehicle and an inside air intake 3 for introducing air inside the vehicle is integrated.
-2- It consists of an upper case 5 and a lower case 6 joined to this upper case 5. A motor 8 for driving a fan 7 provided in the case 1 is attached to the lower case 6. This motor 8 is adapted to rotate about a substantially vertical axis, and as the motor 8 is driven, air flows into the fan 7 through a bell mouth portion 9 provided in the upper case 5. This incoming air is
As shown in the figure, the pressure is increased by the fan 7 and is pushed out to the fan scroll 13 in a planar spiral shape formed in the case 1 by the top wall 10 of the upper case 5 and the bottom wall 11 and side wall 12 of the lower case 6. The discharge port 14 is reached. 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, a part of the air heading toward the river outlet 14 of the case 1 flows into the motor 8 through the air passage 18 in the pipe section 16, and the motor The discharge port 19 formed in the housing of the motor 8 returns into the case 1 as shown by the arrow, and the motor 8 is cooled. However, when the intake door 15 is set at the position shown in the figure, the outside air intake 2 is closed, and the inside air intake a 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, the water droplets that have entered into case 1 are mainly absorbed by case 1.
Conventionally, the opening 20 of the air passage 18 into the case 1 is formed in the side wall above the bottom wall 11, as shown in FIG.

(Problems to be Solved by the Invention) In such a conventional inch-kukonite, the opening 20 is formed in the upper part of the side wall 12 as described above, but the opening 20 is formed in the upper part of the side wall 12, but the opening 20 is formed in the upper part of the side wall 12. Thoughts! Then, when the opening area of the frontage part 20 is the same, the position of the inflow air differs depending on the position where the opening part 20 is formed, and the area where the fan 7 and the side wall 12 are closest is the so-called nose part N.
If the opening 20 is formed in the side wall 12 on the rear side in the direction of rotation of the fan 7, the number of inflow air will increase. It was found that the amount of water droplets was small, and as the opening 2 degrees was shifted in the direction of rotation of the fan 7, the amount of water droplets flowing in gradually increased.

In view of the above-mentioned problems of the prior art, the present invention aims to cool the motor attached to the case of the intake unit by guiding the air inside the intake unit to the motor with a minimum opening area and supplying the air to the motor. The purpose is to minimize the amount of moisture contained in the air.

(Means for Solving the Problems) To achieve the above object, the present invention provides a bottom wall on which a motor is attached, a top wall on which a bell mouth is formed, and a side wall connecting these bottom walls and the top wall. a fan driven by the motor is housed in a case of an intake unit having
A fan scroll is formed in the case so that the distance between the fan scroll and the side wall gradually increases, and the angle in the rotation direction of the fan is O with the nose portion as a reference.

θ <210' An intake unit characterized in that an opening is formed in the upper part of the side wall, and a pipe part in which an air passage communicating with the opening is formed is formed on the outside of the side wall of the case. It is.

(Example) Next, the illustrated example of the present invention will be described. 1st
3 to 3 are diagrams showing an intake unit according to an embodiment of the present invention, and in these figures, the same reference numerals are given to the same parts as those in FIGS. 7 and 8.

As shown in the figure, a case 1 of an intake unit that houses a fan 7 is composed of an upper case 5 and a lower case 6, and includes a bottom wall 11 to which a motor 8 is attached, an upper wall 10 on which a bell mouth 9 is formed, and and a side wall 12 connecting the two. Therefore, when the fan 7 is rotated by the drive of the motor 8 attached to the bottom wall 11 of the lower case 6, the air reaching the fan 7 from the bell mouth 9 flows through the fan scroll formed in the spiral-shaped chamber inside the case 1. Fan 7 on 13
is pushed out and reaches the discharge port 14.

In order to supply air for cooling the motor 8, an opening 20 is formed in the side wall 12 of the case 1, and a tube section on the outside of the side wall 12 is formed with an air passage 18 that communicates with the opening 20 inside. 16 are formed. There is a gap 2 between the lower end 16a of this tube portion 16 and the outer surface of the side wall 12 of the case 1.
1 is formed, one end of which is attached to the housing of the motor 8, and the other end of the boss 17 is connected to the lower end portion 16a of the pipe portion 16.
It is designed to be mated to the Gap 21 is hose 17
When the other end of the hose 17 is fitted to the lower end 16a of the tube section 16, the hose 17
is the lower end 16a and the side W of the case 1! 12. In Figure 3, the hose 17 is attached to the side wall 12.
The synthetic rubber or synthetic resin hose 17 is elastically deformed and comes into surface contact with the outer surface of the side wall 12 of the case 1 over a predetermined range. .

In this way, the back of the hose 17, the lower end 16 of the pipe portion 16
The part that fits into a is held between the outer surface of the side wall 12 of the case 1 and the lower end 16a, so that even if an external force is applied to the hose 17, the hose 17 will not easily come off from the lower end 16a. It disappears.

FIG. 9 shows a frontage 20 of the same area with a fan 7 and a side wall 12.
The rear position in the rotational direction of the fan 7 from the so-called nose part N where the two are closest, for example, 90° in FIG. 4, and 90° in FIG. 5:
160', Fig. 6; motor temperature (brush temperature) when the angle is changed to 210°, and the inside of the opening 20 when a predetermined amount of moisture is supplied together with air into the bell mouth 9. This is a characteristic line showing the relationship between the amount of moisture that has entered the In FIG. 9, a characteristic line S indicates the amount of moisture infiltrating into the opening 2o when the opening area of the opening 20 is the same and a predetermined amount of moisture is supplied together with air from the bell mouth 9. Line T shows the change in motor humidity when the rotation speed of fan 7 is the same. In FIG. 2, a straight line R connecting the rotation center of the fan 7 and the nose portion N
If the angle of the rotation direction of the fan 7 is θ with reference to the position of , the opening 2
0, no moisture infiltrates, but after that angle, moisture begins to infiltrate, and as the angle θ increases, the infiltrated moisture increases. Therefore, even if the amount of incoming air is large, forming the opening 20 at a location where the angle θ is large, that is, at the rear of the side wall 12 in the rotational direction of the fan 7, prevents moisture from flowing into the opening 20. It was found that this is not preferable because the m of .

From the above-mentioned experimental results, in the embodiment shown in FIG. 1.2, the frontage part 20 is formed in the side wall 12 at a position slightly rearward of the nose part N. In this case, as is clear from the characteristic curve S shown in FIG. 9, no moisture infiltrates into the opening 20. However, since ff1 of the incoming air is somewhat small, the area of the opening 20 is smaller than that of the fan 7 of the side wall 12.
It is necessary to make the opening larger than in the case where the first part 20 is provided at the rear in the rotational direction.

(Effects of the Invention) As described above, the present invention provides an intake unit having a bottom wall to which a motor is attached, a wall on which a bell mouth is formed, and a side wall connecting these bottom walls and the top wall. A fan driven by the motor is housed in a case, and the distance between the fan and the side wall gradually increases from the nose portion where the distance between the fan and the side wall is closest to the side wall in the direction of rotation of the fan. A fan scroll part is formed in the case, and an opening is formed in the upper part of the side wall in a range where the angle of the rotation direction of the fan is Q"<θ<210" with respect to the nose part as a reference. It is possible to eliminate moisture flowing into the motor while ensuring inflow air m. Further, as shown in the embodiment, a pipe portion having an air passage formed therein that communicates with the opening portion is formed on the outside of the side wall of the case, and a hose for guiding air for cooling the motor is fitted into the pipe portion. If a gap is formed between the lower end of the pipe and the outer surface of the side wall of the case, and the hose is sandwiched between the outer surface of the side wall of the case and the lower end of the pipe, cooling air can be supplied to the motor. The hose for supplying the gas is securely fixed between the side wall of the intake unit gate and the lower end of the pipe, and the hose is not tightened without using any tools, even if external force is applied to the hose. The hose never comes off.

[Brief explanation of drawings]

FIG. 1 shows an intake unit according to an embodiment of the present invention.
FIG. 2 is a plan view taken along line If-I in FIG. 1, FIG. 3 is a sectional view taken along line I-I in FIG. 2, and FIG. FIG. 5 shows an intake unit according to an embodiment, a plan view corresponding to FIG. 2, FIG. 5 shows an intake unit according to still another embodiment of the present invention, a plan view corresponding to FIG. An intake unit according to still another embodiment of the invention is shown, and FIG. 7 is a sectional view corresponding to FIG. 2, FIG. 7 is a sectional view showing a conventional intake unit, and FIG. 8 is taken along the line ■-■ in FIG. 7. The cross-sectional view, FIG.
5... Upper case, 6... Lower case, 7... Fan, 8... Motor, 9... Bell mouth, 12...
・Side wall, 13...Fan scroll, N...Food portion, 14...Discharge port, 17...Hose, 21...
Gap, Special γF Applicant: Nissan Motor Co., Ltd.
Japan Radiator Co., Ltd. 1: Case
9: Bell mouth 5: Eon 5 case 13
:F〉Scroll 6: Lower case 17:
Hose 7: 7 Ann N: No χ' part 8:
Motor Fig. 3 Fig. 7 Fig. 8 □f-

Claims (1)

[Claims] A fan driven by the motor is accommodated in a case of an intake unit having a bottom wall to which a motor is attached, an upper wall in which a bell mouth is formed, and a side wall connecting these bottom walls and the upper wall, A fan scroll portion is formed in the case, and the distance between the fan and the side wall gradually increases from the nose portion where the distance between the fan and the side wall is closest to the side wall in the direction of rotation of the fan, and the nose portion is used as a reference. If the angle of the rotation direction of the fan is 0°<θ<210°
An intake unit characterized in that an opening is formed in the upper part of the side wall in the range, and a pipe portion having an air passage formed inside that communicates with the opening is formed on the outside of the side wall of the case.