JPS6357242B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) 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. 7 and 8 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. 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. As shown in FIG. 8, this inflowing air is pressurized by the fan 7 and forms a plane spiral shape inside 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. It is pushed out by the fan scroll 13 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, the lower case 6
A tube portion 16 is formed on the outside of the motor 8 , and a hose 17 is connected between the tube portion 16 and the housing of the motor 8 .

As a result, as the motor 8 is driven and the fan 7 rotates, a portion of the 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 the air flows into the motor 8. The discharge port 19 formed in the housing returns into 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 the water droplets that have entered the case 1 mainly accumulate on the bottom wall of the case 1,
Conventionally, as shown in FIG. 7, an opening 20 of the air passage 18 into the case 1 is formed in a side wall above the bottom wall 11.

(Problems to be Solved by the Invention) In such a conventional intake unit, the opening 20 is formed at the upper part of the side wall 12 as described above, but considering the case where water droplets flow in from the bell mouth 9. Then, when the opening areas of the openings 20 are the same, the amount of incoming air differs depending on the position where the openings 20 are formed, and the amount of air flowing in from the fan 7 and the side wall 12
An opening 20 is provided in the side wall 12 on the rear side in the direction of rotation of the fan 7 than the so-called nose portion N where the two are closest to each other.
On the other hand, when the opening 20 is formed at the nose part N, the amount of water droplets flowing into the opening 20 is the smallest.
It has been found that as the fan 7 is shifted in the rotational direction of the fan 7, the amount of water droplets flowing in gradually increases.

In view of the above-mentioned problems of the prior art, the present invention has been devised to guide the air inside the intake unit to the motor with the minimum opening area in order to cool the motor attached to the case of the intake unit, and to supply 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 case, and a side wall is disposed in the direction of rotation of the fan (indicated by an arrow) from a nose portion where the distance between the fan and the side wall is closest. A fan scroll is formed in the case so that the distance between the fan scroll and the fan scroll gradually increases, and the angle in the rotation direction of the fan with respect to the nose portion is 0°<0°.
θ < 210° range An intake unit characterized in that an opening is formed in the upper part of the side wall, 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. be.

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

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 a bottom wall 1 to which a motor 8 is attached.
1, an upper wall 10 on which a bell mouth 9 is formed, and a side wall 12 connecting these. 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 bell mouth 9
The air that has reached the fan 7 is pushed out by the fan 7 into a fan scroll 13 formed in a spiral-shaped chamber in the case 1 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 communicating with the opening 20 inside. 16 are formed. A gap 21 is formed between the lower end 16a of the tube 16 and the outer surface of the side wall 12 of the case 1, and the other end of the hose 17, one end of which is attached to the housing of the motor 8, is connected to the lower end of the tube 16. Part 16
It is designed to be fitted into a. The gap 21 is set to be smaller than the wall thickness of the hose 17, and when the other end of the hose 17 is fitted to the lower end 16a of the tube section 16, the hose 17 is connected to the lower end 16a and the case 1.
It is designed to be held between the side wall 12 of the. FIG. 3 shows that the hose 17 is connected to the side wall 12 and the lower end 16.
FIG. 3 shows a state in which the hose 17 made of synthetic rubber or synthetic resin 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 portion of the hose 17 that fits into the lower end portion 16a of the tube portion 16 is connected to the side wall of the case 1.
2, the outer surface, and the lower end portion 16a, and even if an external force acts on the hose 17, the hose 17 will not easily come off from the lower end portion 16a.

FIG. 9 shows an opening 20 having the same area from a so-called nose portion N where the fan 7 and the side wall 12 are closest to a rear position in the rotational direction of the fan 7, for example, a fourth
Figure: 90°, Figure 5: 160°, Figure 6: 210°, and the motor temperature (brush temperature) when a certain amount of moisture is supplied together with air into the bell mouth 9. 2 is a characteristic line showing the relationship between the amount of moisture intruding into the opening 20 and the amount of water entering the opening 20. In FIG. 9, a characteristic line S indicates the amount of moisture that has entered the opening 20 when the opening area of the opening 20 is the same and a predetermined amount of moisture is supplied from the bell mouth 9 together with air. Line T shows the change in motor temperature when the rotation speed of fan 7 is the same. In FIG. 2, if the angle of the rotation direction of the fan 7 is θ with respect to the position of the straight line R connecting the rotation center of the fan 7 and the nose portion N, the opening 20 There was no infiltration of moisture at , but after that angle, moisture began to infiltrate, and as the angle θ increased, the amount of infiltrated moisture increased. 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, will prevent the inflow into the opening 20. It was found that this is not preferable because the amount of water that is absorbed increases.

From the above-mentioned experimental results, in the embodiment shown in FIGS. 1 and 2, the opening 20 is formed in the side wall 12 at a position slightly behind the nose portion 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 the amount of incoming air is somewhat small, opening 2
The area of the opening 20 needs to be larger than that in the case where the opening 20 is provided at the rear of the side wall 12 in the direction of rotation of the fan 7.

(Effects of the Invention) As described above, the present invention provides an intake unit having a bottom wall on which a motor is attached, an upper wall on which a bell mouth is formed, and a side wall connecting these bottom walls and the upper 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 a nose portion where the distance between the fan and the side wall is the closest in the direction of rotation of the fan. A 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 0° < θ < 210° with respect to the nose part as a reference, so that a predetermined amount of inflow air can be obtained. It is possible to eliminate moisture flowing into the motor while ensuring the same. Further, as shown in the embodiment, a tube 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,
A gap is formed between the lower end of the pipe into which the hose for guiding air for cooling the case is fitted and the outer surface of the side wall of the case, and a gap is formed between the outer surface of the side wall of the case and the lower end of the pipe. By sandwiching the hose between them, the hose for supplying cooling air to the motor can be securely fixed between the side wall of the intake unit case and the lower end of the pipe, and the hose can be tightened to secure it. To prevent a hose from coming off even if an external force is applied to the hose without using a tool.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an intake unit according to an embodiment of the present invention, FIG. 2 is a plan view taken along the line - in FIG. 1, and FIG. 3 is a sectional view taken along the line - in FIG. FIG. 4 shows an intake unit according to another embodiment of the present invention, and is a plan view corresponding to FIG. 2, and FIG. 5 shows an intake unit according to still another embodiment of the present invention. A corresponding plan view, FIG. 6 shows an intake unit according to another embodiment of the present invention, a sectional view corresponding to FIG. 2, FIG. 7 a sectional view showing a conventional intake unit, and FIG. A sectional view taken along the - line in FIG. 7, and FIG. 9 are characteristic diagrams showing the relationship between the amount of moisture flowing into the opening and the temperature rise of the motor in the present invention. 1... Case, 5... Upper case, 6... Lower case, 7... Fan, 8... Motor, 9... Bell mouth, 12... Side wall, 13... Fan scroll, N... Food section, 14...discharge port, 17...
...Hose, 21...Gap.

Claims (1)

[Claims] 1. A fan driven by the motor is housed in a case of an intake unit, which has a bottom wall to which the 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 scroll part is formed in the case, and the distance between the fan and the side wall gradually increases from the nose part where the distance between the fan and the side wall is closest in the direction of rotation of the fan, and the nose part is As a reference, the angle of the rotation direction of the fan is 0°<θ<
An intake unit characterized in that an opening is formed in the upper part of the side wall in a range of 210 degrees, 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.