JP2002344182A - Cooling fan system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling fan system which can secure redundancy by making the influence of one defect cooling fan on the other fan as small as possible. SOLUTION: The cooling fan system comprises two cooling fans 2 driven by different motors which are arranged in the air blowing direction in one and the same case 1. In the case 1, the volume of the wind tunnel 4 around blades of each cooling fan 2 is formed larger at the suction side and smaller at the discharge side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a cooling fan device.

[0002]

2. Description of the Related Art Generally, a cooling fan device used for preventing a thermal runaway due to a rise in temperature of a semiconductor device in a housing has a lifetime because it includes a mechanically movable portion, and has a redundancy in a cooling system. Grant is required.

In order to provide redundancy to the cooling system, for example, the number of cooling fans required by the system is arranged to prepare for any failure of the cooling fan. In this case, as shown in FIG. As described above, two cooling fans 2, 2 are connected in the cooling air blowing direction.

[0004]

However, in the above-described conventional example, when one of the cooling fans 2 is out of order,
Since the cooling fan 2 that has stopped rotating due to a failure becomes a resistance element with respect to the air path of the other cooling fan 2, there is a problem that a predetermined air volume cannot be obtained or noise increases. In particular, the axial fan frequently used as the cooling fan 2 has a resistance element on the suction side.
There is a problem that since the blowing capacity is significantly reduced, the blowing capacity when the cooling fan 2 on the suction side stops is greatly reduced.

In order to solve this problem, it is possible to increase the interval between the cooling fans 2 and 2 provided in series, but in this case, there is a problem that the size of the device becomes large.

Each cooling fan 2 is provided with a finger guard 2a for safety considerations. The finger guards 2a, 2a,
Since a is a resistance element to the blowing, it also causes a decrease in cooling performance.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and a cooling fan capable of securing redundancy by minimizing the influence of one failure on the other cooling fan. The purpose is to provide the device.

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided a motor vehicle comprising: a motor;
This is achieved by providing a plurality of cooling fans 2 arranged in the blowing direction, and providing a cooling fan device in which the volume of the wind tunnel 4 around the rotor blades 3 of the cooling fan 2 in the case 1 is wide on the suction side and narrow on the discharge side. .

Two cooling fans 2 driven by separate motors are housed in the same case 1. Even when one of them is stopped, air is blown by the other cooling fan 2 and the cooling fan 2 of the electronic device is driven. Prevent overheating. Same case 1
By disposing two cooling fans 2, 2 in the
When one of the cooling fans 2 is stopped, the cooling performance of the other cooling fan 2 by the cooling fan 2 on the stop side does not decrease when one of the cooling fans 2 stops, and the entire size (longitudinal dimension in the blowing direction)
Can be set to a dimension that can be reduced as much as possible, so that a decrease in air blowing performance at the time of one failure can be suppressed, and the volume can be reduced.

Further, as described above, it is known that the axial flow fan frequently used as the cooling fan 2 has a significantly reduced air blowing performance if there is an obstacle on the suction side.
In the case where two axial fans are arranged in series in the air blowing direction for providing redundancy, it is considered that the air blowing performance is greatly reduced due to the stoppage of the cooling fan 2 on the suction side.

In the present invention, when the volume of the wind tunnel 4 around the rotor 3 of the cooling fan 2 in the case 1 is large on the suction side and small on the discharge side, when the cooling fan 2 on the suction side stops, the volume on the suction side is reduced. Since the prepared wide wind tunnel functions as a ventilation path to the discharge-side cooling fan 2A, the supply of the cooling air to the discharge-side cooling fan 2A is ensured, and the blowing performance is not reduced.

In addition, in order to prevent a decrease in air blowing performance when the suction side cooling fan 2B stops, a spare air passage 5 is formed in the case 1 or the suction side cooling fan 2B. Cooling air can also be supplied to the discharge-side cooling fan 2A from the air passage 5. In this case, if the preliminary air passage 5 is directed toward the center of the suction surface of the discharge-side cooling fan 2A, it is possible to further reduce the deterioration of the air blowing performance.

Further, when the motor housing 6 of the suction side cooling fan 2B is provided with a guide projection 9 for guiding the cooling air to the rotation center of the discharge side fan, the blowing efficiency of the discharge side cooling fan 2A can be improved. .

Further, the cooling fan device includes a separate motor 6 within the same case 1 having the cylindrical portion 1a constituting the wind tunnel 4.
Is a cooling fan device that arranges two cooling fans 2 driven by the cooling fan in the blowing direction, and one of the cooling fans 2 is
A bearing house 7a is fixed to an arm 1b integrally formed on an inner wall surface at a longitudinal center portion of the cylindrical portion 1a and held by the case 1, and the other cooling fan 2 is fixed to the bearing house 7a. It can be configured to be held on the case 1 via the arm 8.

With the above-described configuration, two cooling fans 2 can be easily accommodated in the same case 1, the manufacturing efficiency is improved, and the conventional cooling fan devices are provided in two stages. Since the finger guard 2a at the intermediate portion can be removed as compared with the case of overlapping, a decrease in cooling efficiency can be avoided.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 to 4, the cooling fan device is constructed by housing two cooling fans 2, 2 in a case 1 side by side in a blowing direction. The case 1 has a cylindrical portion 1a that forms a cylindrical wind tunnel 4 and an arm portion 1b that projects over the center of the cylindrical portion 1a.
b holds the suction side cooling fan 2B.

As shown in FIG. 3, the cooling fan 2 includes a motor holding portion 7 having a bearing house 7a and a rotating blade 3 fixed to an outer peripheral wall of the motor housing 6. The printed circuit board 7c for control and the motor frame 7d are fixed. Two ball bearings 7f facing each other via a spring 7g are provided in the bearing house 7a.
Is held, and the rotating shaft 7 is
e is rotatably held. In addition, bearing house 7
A coil 7b is fixed around a, and a motor is configured in cooperation with a permanent magnet 6a fixed to the motor housing 6.

When the cooling fan 2 is mounted on the arm 1b, first, the motor bearing 10 is sub-assembled by the motor frame 7d, the printed circuit board 7c, and the coil 7b, and the motor bearing 10 is formed on the arm 1b. Pressed into the fixed motor receiving portion 1f and fixed (see FIG. 4B).

Thereafter, the spring 7g, the ball bearing 7f, and the rotating shaft 7e fixed to the motor housing 6 are inserted into the motor bearing body 10 (see FIG. 4C). Finally, the ball bearing 7f is inserted from the opposite side. Is inserted, the retaining ring 7h prevents the rotating shaft 7e from being detached, and the mounting is completed.

In contrast to the suction-side cooling fan 2A incorporated as described above, the discharge-side cooling fan 2A
As shown in FIG. 5, is formed on the motor holding portion 7 having the fixing arm 8 in the radial direction, and is fixed to the discharge-side end face of the case 1 in which the suction-side cooling fan 2B is previously incorporated as described above. You. In order to fix the discharge side cooling fan 2A, a screw hole 1c is provided on the discharge side end surface of the case 1, and at the tip of the fixed arm 8, an insertion hole for a fixing element screwed into the screw hole 1c. 8a are provided.

In this state, when the rotating blade 3 is rotated by driving the motor, the cooling air is sucked from the suction side cooling fan 2B and is discharged from the discharge side cooling fan 2A as shown by an arrow A in FIG. It is exhaled. FIG.
As shown in (a), at the suction side end of the wind tunnel 4, an inclined surface 1 d whose opening area gradually increases toward the end face of the case 1 is provided, so that the rotor blades of the suction side cooling fan 2 </ b> B in the case 1 are provided. The volume of the wind tunnel 4 around the area 3 (the area hatched in FIG. 1A and denoted by reference numeral 4A) is the volume of the wind tunnel 4 around the rotor 3 of the discharge-side cooling fan 2A (the area hatched in FIG. 1A). In this case, even when the suction side cooling fan 2B is stopped due to a failure or the like, the wind tunnel around the rotor 3 of the suction side cooling fan 2B is provided. Since the volume of the air inlet 4 is large, the increased wind tunnel 4A 'having a hollow conical shape functions as a cooling air supply air passage to the discharge side cooling fan 2A, so that the blowing capacity is not reduced.

A guide slope 1e having an opening area gradually increasing toward the end face of the case 1 is provided at the end of the wind tunnel 4 on the discharge side, so that the cooling air discharged from the discharge side cooling fan 2A can be diffused radially. The pressure loss on the exhaust side is reduced.

In the above description, the discharge side cooling fan 2A has been described in the case where the free end of the fixed arm 8 is fixed by a fixing member. However, as shown in FIG. You can also. That is, the case 1 is provided with the engagement recessed portion 11 having the opening 11 a facing the outside of the case 1. The engaging recess 11 is provided with an opening 11a.
And a bag-shaped fitting portion 11b extending into the fleshy portion of the case 1 in the rotation direction of the rotor 3 of the cooling fan 2 from the vicinity of the bottom wall. When the fixed arm 8 is mounted, first, the connecting end 8b formed at the free end of the fixed arm 8 is inserted from the opening 11a, and then the entire fixed arm 8 is rotated in the rotation direction of the rotary wing 3 (see FIG. 6A). , Clockwise). By rotating the fixed arm 8, the connecting end 8b
Is inserted into the fitting portion 11b and the wall portion 11 of the engagement concave portion 11 is formed.
c prevents falling off and is fixed at a predetermined position.

When the cooling fan 2 is operated in this state, the fixed arm 8 is provided with a rotational force in the rotation direction of the rotary wing 3 with the rotation of the rotary wing 3, so that the fixed arm 8 does not fall off carelessly. In this case, if the tapered surface 8c that slides on the tapered surface 11c of the fitting portion 11b is provided at the tip of the connection end 8b of the fixed arm 8, the connection end 8b fits in a wedge shape with the rotation of the rotary blade 3. Since the fitting part 11b is fitted, rattling or the like can be completely prevented. Also, the fitting portion 11b
The stopper boss 1 through which the connecting end 8b can pass and which resiliently locks to the connecting end 8 at the mounting position
When 1d is provided in a protruding manner, careless dropping of the cooling fan 2 can be completely prevented.

FIG. 7 shows a second embodiment of the present invention.
In the following description of the embodiment, the same components as those in the above-described embodiment are denoted by the same reference numerals in the drawings, and description thereof will be omitted. In this embodiment, a plurality of preliminary air passages 5, 5,... The preliminary air passage 5 is formed in a slit shape at a position from the suction-side end surface of the case 1. As shown by an arrow A ′ in FIG. 7, each of the auxiliary air passages 5 is provided to supply cooling air from the outside of the case 1 to the discharge-side cooling fan 2A, and supplies the cooling air to the discharge-side cooling fan 2A. It is opened facing the center of the suction surface so as to guide it near the center.

Therefore, in this embodiment, even if the suction side cooling fan 2B is stopped, the outside air is supplied to the discharge side cooling fan 2A from the preliminary air passage 5, so that the pressure loss becomes excessive. There is no lowering of the blowing performance. Further, since the outside air supplied from the preliminary air passage 5 is directed to the vicinity of the center of the suction surface of the discharge side cooling fan 2A, the discharge side cooling fan 2A
The air blowing efficiency is increased.

FIG. 8 shows a modification of FIG. In this modified example, the preliminary air passage 5 is formed in the motor holding portion 7 of the suction side cooling fan 2B. A plurality of the preliminary air passages 5 are formed at a predetermined pitch on the periphery of the motor holding unit 7 so as not to interfere with the wiring pattern of the bearing house 7a, the coil 7b, or the printed board 7c.

Therefore, in this modification, when the suction side cooling fan 2B is stopped, as shown by the arrow A 'in FIG.
A gap between the motor housing 6 and the motor holding portion 7;
And the cooling fan 2 on the discharge side via the preliminary air passage 5
Since the outside air is supplied to A, the air blowing performance does not decrease.

FIGS. 9A and 9B show another modification of FIG. In this modified example, the preliminary air passage 5 is opened in the motor holding portion 7 of the suction side cooling fan 2B and the motor housing 6 of the suction side cooling fan 2B. The preliminary air passage 5 provided in the motor housing 6 penetrates through the motor housing 6 to reach the suction-side end face of the suction-side cooling fan 2B. The suction side cooling fan 2B holds a predetermined rotation position under the influence of the permanent magnet 6a in a stopped state, and the preliminary ventilation path 5 on the motor housing 6 side and the preliminary ventilation path 5 on the motor holding unit 7 stop rotation. In this state, the two preliminary air passages 5 communicate with each other.

Therefore, in this modified example, when the suction side cooling fan 2B stops, the preliminary air passage 5 is opened in a penetrating manner to the suction side end face of the suction side cooling fan 2B, as shown by an arrow A 'in FIG. 9 (a). Then, outside air is supplied to the discharge side cooling fan 2A.

In the modification shown in FIGS. 9A and 9B, the auxiliary air passage 5 on the motor housing 6 side is provided so as to penetrate through the inside of the motor housing 6.
As shown in (c) and (d), the outer periphery of the motor housing 6 may be cut out.

FIG. 10 shows a third embodiment of the present invention. In this embodiment, the suction side cooling fan 2
The motor housing 6 of B has a guide projection 9. The guide projection 9 discharges the outside air introduced from the above-described increased wind tunnel 4A ′ or the preliminary air passage 5 to the cooling fan 2A on the discharge side.
The motor housing 6 is provided at the center of the exhaust-side end face so that it can be guided to the center of the intake surface of the motor housing 6. The guide projection 9 is formed in a pointed shape as shown in FIG. 10A, or gradually approaches the discharge side cooling fan 2A as it goes to the center as shown in FIG. 10B. It can be formed with a curved surface.

[0033]

As is apparent from the above description, according to the present invention, it is possible to secure the redundancy by minimizing the influence of one failure on the other cooling fan.

[Brief description of the drawings]

1A and 1B are diagrams showing the present invention, wherein FIG. 1A is a sectional view and FIG. 1B is a sectional view of a motor unit.

FIGS. 2A and 2B are exploded views of the cooling fan device, wherein FIG. 2A is a diagram illustrating an assembling method, and FIG.

FIG. 3 is an enlarged sectional view of a main part showing a motor holding unit.

FIG. 4 is an explanatory view showing a method of incorporating a cooling fan.

FIG. 5A of FIG. 2A showing a discharge-side cooling fan;
It is a direction arrow view.

FIG. 6 is a view showing a modification of the method of mounting the cooling fan;
(A) is a front view, (b) is an enlarged view of a 6B portion of (a),
(C) is a sectional view taken along line 6C-6C of (b).

FIG. 7 is a half sectional view showing a second embodiment of the present invention.

FIG. 8 is a view showing a modification of FIG. 7, wherein (a) is a sectional view,
(B) is an arrow view in the 5B direction of (a).

9A and 9B are views showing another modified example of FIG. 7, wherein FIG. 9A is a cross-sectional view, FIG. 9B is a view taken in the direction of arrow 9B in FIG. 9A, and FIG.
FIG. 9A is a diagram showing a modification example, and FIG. 9D is a view in the direction of the arrow 9D in FIG.

FIG. 10 is a diagram showing a third embodiment of the present invention;
(A) is a side view, (b) is a side view which shows the modification of (a).

FIG. 11 is a diagram showing a conventional example.

[Description of Signs] 1 Case 1a Tube section 1b Arm section 2 Cooling fan 2A Outlet-side cooling fan 2B Suction-side cooling fan 3 Rotor blade 4 Wind tunnel 5 Preliminary air passage 6 Motor housing 7a Bearing house 8 Fixed arm 9 Guide projection

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H032 AA04 CA02 CA08 MA11 MA15 NA05 NA06 3H034 AA02 BB02 BB08 BB17 CC03 DD05 DD18 DD26 EE05 EE12 5E322 BA05 BB03 EA11

Claims (8)

[Claims] A cooling fan driven by a separate motor is arranged in the same case in a blowing direction, and a volume of a wind tunnel around a rotating blade of the cooling fan in the case is wide on a suction side and on a discharge side. Narrow cooling fan device. 2. A cooling fan device in which two cooling fans driven by separate motors are arranged in the same case in the air blowing direction, and provided with a preliminary air blowing path to the cooling fan on the discharge side. 3. The cooling fan device according to claim 2, wherein the preliminary air passage is provided on a side wall of the case. 4. The cooling fan device according to claim 2, wherein said preliminary air passage is formed in a suction side cooling fan. 5. The cooling fan device according to claim 2, wherein the preliminary air blowing path is directed to a central portion of a suction surface of the discharge side cooling fan. 6. A guide for arranging two cooling fans driven by separate motors in the same case in a blowing direction, and for guiding cooling air to a motor housing of a suction-side cooling fan to a rotation center of the discharge-side fan. The cooling fan device according to any one of claims 1 to 5, further comprising a projection. 7. A cooling fan device in which two cooling fans driven by separate motors are arranged in a blowing direction in the same case provided with a cylindrical portion forming a wind tunnel. The bearing house is fixed to the arm part integrally formed on the inner wall surface of the central part in the longitudinal direction of the part and held by the case, and the other cooling fan is held by the case via the fixed arm to which the bearing house is fixed Cooling fan device. 8. The cooling fan device according to claim 7, wherein the fixed arm is mounted with a free end engaged with an end face of the case by a rotation operation of the cooling fan in a rotation direction.