JPS6185214A - Fan motor cooling construction - Google Patents

Abstract

PURPOSE:To prevent invasion of rainwater into cooling wind, and to increase volume of wind by constructing an air induction pipe to an unusual shape tubular form which has a major axis to the direction of absolute velocity vector of a liquid which is blown out by the fan on air intake fan cooling construction of air-conditioning system for motorcars. CONSTITUTION:The cross sectional shape of the pipe 16, which is provided on the outside of the side wall 12 of the intake unit case, and connects the inside of the case and the fan motor through an opening 200 and a hose, which is not shown in the figure, is constructed to an unusual shape tubular form which has a major axis 27 to the direction of absolute velocity vector 22 of a liquid blown out by the fan 7 in a fan scroll 13. That is, the cross sectional shape of the pipe 16 becomes J-form across section in which a straight line, which connects the center and the summit of the opening 20, is consistent with the tangent of the fan 7. Owing to this construction, the cooling air can be induced smoothly from the opening 20 without the occurrence of vortex. Therefore, the sectional area of the opening can be smaller, and invasion of rainwater can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cooling structure for a fan motor attached to an intake unit of an automobile air conditioner.

(Reference 5l (Technology) The intake unit in an air conditioner for a full-sized car has a fan inside to send air into a single room, and the fan motor that drives this fan is attached to the case of the intake unit. Being beaten.

The fan motor usually generates heat due to the contact between the 1mm kotator and the brushes that feed the Amachi core through this.
In the J: Urchin shown in Japanese Patent No. 126, cooling air is forcibly supplied to the 21 fan motor. FIG. 3.4 is a diagram showing a conventional intake unit configured to send forced cooling air to such a fan motor.

As shown in the figure, the case 1 of the intake unit includes an inside/outside air switching box 4 which has an outside air intake 2 for introducing air from outside the vehicle and an inside air inlet 3 for introducing air from inside the vehicle. It consists of an upper case 5 which has been formed into a shape, and a lower case 6 which is joined to this upper case 5. A fan motor 8 for driving a fan 7 provided inside the case 1 is attached to the lower case 6 . This fan motor 8 rotates around a substantially vertical axis, and as the fan motor 8 is driven, air flows into the fan 7 through a bell mouth portion 9 provided in the upper case 5. do. This incoming air is pressurized by the fan 7 and is 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 into a plane spiral shape as shown in FIG. It flows along the fan scroll 13 and reaches the discharge port 1/I. (1CFJ) An intake door 15 is installed inside the exchange box 4 to open and close the outside air intake 2 and the inside air intake 3.

In order to supply air for cooling the fan motor 8, a tube portion 16 is formed on the outside of the lower case 6, and a hose 17 is connected between the tube portion 1G and the housing of the motor 8. As a result, as the fan motor 8 is driven and the fan 7 rotates, the outlet 14 of the case 1
A part of the air flowing toward the air flows into the fan motor 8 through the air passage 18 in the pipe section 16 and returns into the case 1 from one outlet formed in the housing of the fan motor 8 as shown by the arrow. , the fan motor 8 will be cooled (N).

On the contrary, when the intake door 15 is set to the position shown by the solid line in FIG. When water or the like enters the case 1, these water droplets may enter the motor interior 8 through the air passage 18. Therefore, since the air accumulates on the bottom wall of the case 1, conventionally, as shown in FIG. 3, an opening 20 of the air passage 18 into the case 1 is formed in the side wall at a position above the bottom wall 11.

(Problems to be Solved by the Invention) However, in such a conventional fan motor cooling structure, the pipe portion 16 simply protrudes perpendicularly to the side wall 12, and the air flowing inside the fan scroll 13 is Since the shape is not directly related to the direction, the amount of air that enters the air passage 18 in the tube section 16 is not sufficient to cool the inside of the fan motor. In other words, the wind flowing along the side wall 12 generates a vortex along the wall upstream of the opening 20 (above the pipe 16 in FIG. 4) due to the sudden cross-sectional change at the opening 20. This is because the smooth flow of air from the opening 20 to the pipe line 16 is obstructed. On the other hand, in order to increase the amount of air entering this air passage 18, that is, the fan motor cooling ff1ffi, the opening area of the opening 10 made in the case 1 may be increased, but in this case, rainwater etc. may enter through this opening 20. I didn't like it because it made it hard.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a fan motor cooling structure that can prevent rainwater etc. from entering the fan motor cooling air and increase the fan motor cooling air. purpose.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an air passage inside the outside of the side wall of the case of an intake unit in which a fan is built in and a fan motor for driving the fan is attached. Forming the formed pipe part 1, communicating the inside of the case and the air passage through an opening, attaching a hose communicating with the inside of the fan motor to the pipe part, and connecting the air passage and the air passage from the opening. In the fan motor cooling structure in which cooling air is sent into the fan motor through the inside of the hose, the cross-sectional shape of the pipe section is made into an irregular pipe shape with long sleeves in the direction of the absolute velocity vector of the fluid discharged by the fan. That's what happens.

(Function) Therefore, according to the present invention, the wind in the direction of the absolute velocity vector of the fluid generated by the fan installed inside the case of the intake unit easily enters the air passage in the pipe portion from the opening. , the fan motor cooling air volume can be increased.

(Example) Embodiments according to the present invention will be described below based on the drawings.

1 is a partial sectional view of an intake unit showing an embodiment of the present invention; FIG. 2 is a partial sectional view taken along line I-r in FIG. 2;
It is a sectional view taken along line -I, and the same reference numerals are given to the same members as those shown in FIGS. 3-4.

As shown in FIG. 1, a case 1 of an intake unit includes a built-in fan 7 and a fan motor for driving the fan, and is comprised of an upper case 5 and a lower case 6. On the outside of the side wall 12 in this lower case 6,
A tube portion 16 having an air passage 18 formed therein is integrally formed with the lower case 6. A small diameter pipe part 16a is formed at the lower end of this pipe part 16 to which a boss 17 communicating with the inside of the fan motor 8 is attached. A gap 21 whose width is slightly narrower than the wall thickness is formed. Therefore, when attaching the end portion of the hose 17 to the small diameter tube portion 16a, the thick wall portion of the hose 17 is elastically deformed and held between the side wall 12 and the small diameter tube portion 16a, and the hose 17 is held between the side wall 12 and the small diameter tube portion 16a. 17 to the small diameter pipe portion 16a, which does not require any special fittings or the like.

As shown in FIG.
The absolute velocity vector 22 of the fluid (air) at the fan outlet due to the rotation of
The cross section is J-shaped so that the center line connecting the center and the top of the opening 20 coincides with the tangential direction of the fan 7. The absolute velocity vector 22 is a velocity vector at the fluid outlet portion 24 of the vane plate 23 of the fan 7 that is imparted to the fluid by rotating around the axis in the fluid,
Relative velocity vector 2 determined by the shape of the blade plate 23
5 and a circumferential velocity vector 26 determined by the rotation speed of the fan 7, etc.

This absolute velocity vector is generated for each blade in the fan 7, and depending on the number of rotations of the fan 7, the fluid swirls in the direction of this absolute velocity vector and is discharged from the fan 7 along the shape of the fan scroll 13. Exit 1
Head to 4. The long axis 27 of the irregular tube shape is thus aligned with the absolute velocity vector generated in the fan 7.

Further, as shown in FIG. 1, the opening 20 that communicates the air passage 18 formed in the pipe portion 16 with the inside of the fan scroll 13 is located at the side W! of the upper case 5. It is formed near earthen wall 10''ii of 12.

According to such a fan motor cooling structure, since the tube part 16 is inclined in the direction of the wind when the fan is drawn and has an irregular tube shape, the opening 2 Ohs can be smoothly cooled without generating any vortices. Cooling air enters, and the fan motor cooling air m can be increased without increasing the opening area of the opening 20. Therefore, there is no possibility that rainwater or the like may enter through the opening.

In particular, if the opening 20 is formed on the rear side of the so-called nose part N where the fan 7 and the side wall 12 are closest, in the direction of rotation of the fan, there will be more air flowing in, but on the other hand, water droplets flowing into the opening 20 will be larger. There will also be more hangings. Fan 7 from nose part N
The relationship between the motor temperature (brush temperature) when the opening 20 position is changed to the rear position in the rotational direction of the motor and the moisture that has entered the opening 20 when a predetermined amount of moisture is supplied to the bell mouth 9 along with air. The characteristic lines shown are as shown in FIG.
Shows changes in motor temperature. Nose PjIN of the opening 20
It is convenient to form the fan 7 in a range of 210'' rearward in the direction of rotation of the fan 7, since this allows wind to enter more easily while preventing water from entering through the decoy opening 20.

(Effects of the Invention) As described above, according to the present invention, a pipe having an air passage formed inside is provided on the outside of the case side wall of an intake unit in which a fan is built in and a fan motor for driving the fan is attached. forming a section, communicating the inside of the case and the air passage through an opening, attaching a bow communicating to the inside of the fan motor to the pipe part, and passing the air passage and the inside of the hose from the opening to the fan. In a fan motor cooling structure that sends cooling air into the inside of the motor, the cross-sectional shape of the pipe section is made into a deformed pipe shape having a long axis in the direction of the absolute velocity vector of the fluid discharged by the fan. Rainwater and the like do not enter into the cooling air, and therefore the durability of the fan motor is improved, and the fan motor cooling air volume is increased to improve the efficiency of the fan motor.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention.
・A sectional view taken along the line I-1 in FIG. 2; FIG. 2 is a sectional view taken along the If-If line in FIG. 1; FIG. 3 is a partial sectional view of a conventional intake unit. , 4th
The figure is a cross-sectional view taken along the line IV--IV in FIG. 3, and FIG. 5 is a characteristic line diagram showing the relationship between inflow moisture and motor temperature when changing tcl IiJ. 1...Case, 7...Fan, 8.
...Fan motor, 12...Side wall, 16...Pipe portion, 17...Hose, 18...Air passage, 10...Opening, 22...Absolute velocity vector, 27... Long axis. Patent applicant Nissan Motor Co., Ltd.
Japan Radiator Co., Ltd. Figure 3 2. 〆te7;;=;;==Nkuζ Schiff 12 Figure 5

Claims (1)

[Claims] 1) A case (1) of an intake unit in which a fan (7) is built in and a fan motor (8) for driving the fan (7) is attached; an air passage is provided on the outside of the side wall (12); (1
8) is formed, and the case (
1) The inside and the air passage (18) are communicated through an opening (20), and the fan motor (
8) Attach a hose (17) that communicates with the inside, and connect the air passage (18) and the hose (1) from the opening (20).
7) In a fan motor cooling structure in which cooling air is sent into the fan motor (8) through the interior thereof, the cross-sectional shape of the pipe portion (16) is set to be similar to that of the fan (7).
A fan motor cooling structure characterized in that the fan motor has an irregular tube shape having a long axis (27) in the direction of the absolute velocity vector (22) of the fluid discharged. 2) The opening (20) is formed in the side wall (12) within a range of 210° in the rotation direction of the fan from the nose portion (N) where the distance between the fan (7) and the side wall (12) is closest. A fan motor cooling structure according to claim 1, characterized in that: