JPH0861065A - Fan shroud - Google Patents

Abstract

PURPOSE: To realize the performance secureness of a fan shroud and a job for plastic forming by means of vertical rapping as well as to make any admission of foreign substances such as jumping gravel or the like from the side preventable with a cylindrical wall part being high in structural strength. CONSTITUTION: A bell-mouthed aid suction port 10f is formed in a ring connecting part 10e of a double cylindrical part 10, while a foreign substance admission preventing ring body 12 is formed at the air upstream side of this air suction port 10f. In addition, a cylindrical wall part 12a is set up in a position at the outermost circumferential side of this ring body 12 and at the more inner circumferential side than an inner circumferential side cylindrical part 10b. Accordingly, if the bell-mouthed air suction port 10f is formed there, a fan shroud 5 is made so as to be manufacturable in integral forming by means of vertical rapping.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan shroud for guiding the air blown by an axial fan, and is suitable for use as a blower fan for a heat exchanger such as a refrigerant condenser of an automobile air conditioner or a radiator for an automobile. It is something.

[0002]

2. Description of the Related Art Conventionally, in an air conditioner for an automobile, for example, an air conditioner used in a one-box type vehicle, a refrigerant condenser is installed in a substantially horizontal direction in front of a front wheel under the floor of the vehicle.
An air blower that combines an axial fan and a resin fan shroud is installed on the top of this condenser, and air is sucked from the air inlet of the fan shroud by the operation of the axial fan, and this intake air is fed to the condenser. Blowers are used to cool the condenser.

Here, the air intake port is formed in a bell mouth shape in order to facilitate the air intake to the fan and improve the fan performance, and the bell mouth shape is formed in order to improve the rigidity of the shroud. It has been conventionally proposed to form the air intake port with a double cylindrical portion. By the way, in such an air blower for a heat exchanger for an automobile, foreign matter such as flying stones may enter and damage the blade of the axial fan or the core of the heat exchanger. Therefore, a pin having a diameter of about 2 to 3 mm is integrally molded at a fine interval of about 1 cm over the entire circumference of the bellmouth-shaped air intake port of the fan shroud, and the pin is used to laterally connect the bellmouth-shaped air intake port. It is designed to prevent flying stones from entering. In addition, the stay that holds the motor that drives the axial fan is integrally molded on the air upstream side of the bellmouth-shaped air intake port, and a large number of concentric nets are integrally molded on this stay. Stepping stones are prevented from entering from the front of the air intake.

[0004]

However, in the prior art, the diameter is 2 to 3 m so that the pin does not become a ventilation resistance.
Since it is formed in a small diameter of about m, the strength against flying stones is insufficient, and the pins may be damaged by the flying stones. In order to eliminate such a lack of strength, it is possible to integrally form a cylindrical wall at the air inlet of the fan shroud to prevent the entry of flying stones. For the convenience of die-cutting, the wall portion has to be molded into a straight cylindrical shape, so the bell mouth shape cannot be maintained, and as a result, it is not possible to perform efficient air suction by the bell mouth shape, There is a problem that the fan performance is deteriorated.

The present invention has been made in view of the above points,
A fan shroud that can maintain the bell mouth shape at the air intake port, can be resin-molded by simple upper and lower die cutting, and can prevent foreign matter such as flying stones from entering from the side with a strong cylindrical wall. The purpose is to provide.

[0006]

In order to achieve the above object, the present invention employs the following technical means. According to the first aspect of the present invention, there is provided a fan shroud (5) for supporting the axial fan (6) and guiding blown air of the axial fan (6), the outer periphery of the axial fan (6). Cylindrical parts (10b, 10d) located above with a minute gap
And a bell mouth shape which is formed on the air upstream side of the cylindrical portion (10b, 10d) and has a smooth arc-shaped cross-section at a portion facing the tip of the axial flow fan (6). The air inlet (10f) and the cylindrical portion (10
(b, 10d), a foreign matter entry prevention member (12) arranged upstream of the blown air to prevent entry of foreign matter from the upstream side of the blown air, and the foreign matter entry prevention member (12).
At the outermost peripheral side of the cylindrical portion (10b, 10
a cylindrical wall portion (12a) arranged outside the range of the axially projected area of d) and preventing foreign matter from entering from the side of the blast air upstream side;
b, 10d), the foreign matter invasion preventing member (12), and the cylindrical wall portion (12a) are integrally molded of resin.

According to a second aspect of the present invention, there is provided a fan shroud (5) for supporting the axial fan (6) and guiding the air blown by the axial fan (6). Inner peripheral side cylindrical portion (10b) located on the outer periphery of the inner peripheral side cylindrical portion (10b) with a minute interval, and the inner peripheral side cylindrical portion (10b).
The outer peripheral side cylindrical portion (10d) located on the outer periphery of b) at a predetermined interval, and the blower air upstream side end portions of the both cylindrical portions (10b, 10d) are connected to the fan so as to connect the both end portions. Ring-shaped connecting part (10e) extending in the radial direction of
And a bell mouth-shaped air inlet (10f) formed in the ring-shaped connecting portion (10e) so that a portion facing the tip of the axial fan (6) has a smooth arc-shaped cross-sectional shape. And a foreign matter entry preventing member (12) arranged on the upstream side of the blown air with respect to the both cylindrical portions (10b, 10d) to prevent foreign matter from entering from the upstream side of the blown air.
And at a position on the outermost peripheral side of the foreign matter entry prevention member (12) and outside the range of the axial projection area of the cylindrical portions (10b, 10d) and the connecting portion (10e). A cylindrical wall portion (12) for preventing foreign matter from entering from the side of the upstream side of the blown air, the both cylindrical portions (10b, 10d), the connecting portion (10e), the foreign matter entry preventing member. (12), and the cylindrical wall portion (12
A) is characterized by a fan shroud integrally formed of resin.

According to a third aspect of the present invention, in the fan shroud according to the second aspect, the outer peripheral side cylindrical portion (10) is provided.
A skirt-shaped extension (10g) whose diameter gradually increases in the radial direction is formed at the downstream end of the blown air in (d), and the cylindrical wall (12a) is formed on the inner peripheral side cylindrical portion (1).
0b) is located further on the inner peripheral side.

According to a fourth aspect of the invention, in the fan shroud according to the second aspect, the outer peripheral side cylindrical portion (10
d) is linearly formed in the axial direction, and the cylindrical wall portion (12a) is arranged so as to be located on the outer peripheral side of the outer peripheral side cylindrical portion (10d). . According to a fifth aspect of the present invention, in the fan shroud according to any one of the first to fourth aspects, a plurality of the foreign matter ingress prevention members are concentrically formed in a ring body (1
2) is a feature.

According to a sixth aspect of the invention, in the fan shroud according to any one of the first to fifth aspects,
The foreign matter entry prevention member (12) is integrally formed with the stay (11) that supports the axial fan (6). The reference numerals in parentheses of the above means indicate the corresponding relationship with the specific means described in the embodiments described later.

[0011]

According to the inventions of claims 1 to 6,
Since it has the above-mentioned technical means, it is possible to prevent foreign matters such as flying stones from entering from the side by the high-strength cylindrical wall portion (12a), and the conventional pin having a small diameter of about 2 to 3 mm is used. As a result, there is no problem such as damage due to insufficient strength against flying stones.

Further, at a position on the outermost peripheral side of the foreign matter entry preventing member (12) for preventing foreign matter from entering from the upstream side of the blown air, and outside the range of the axial projection area of the cylindrical portion (10b, 10d). Since the cylindrical wall portion (12a) is arranged at the position, the bell mouth shape at the air intake port (10f) can be maintained, and the resin molding can be performed by simple upper and lower die cutting. The fan shroud can be resin-molded at a low cost while ensuring the fan performance by efficiently sucking air due to the shape.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 to 5 show a first embodiment in which the present invention is applied to a fan shroud for a blower of a refrigerant condenser of an automobile air conditioner. In FIG. 4, 1 is a one-box type. The vehicle body 2 of the vehicle is a refrigerant condenser of an air conditioner for the vehicle, and is arranged in a substantially horizontal direction in front of the front wheel 3 under the floor of the vehicle body 1.

Reference numeral 4 denotes a blower unit integrally provided on the upper portion of the refrigerant condenser 2, which is a push-in type for sucking air from the upper portion and blowing the air to the condenser 2. As shown in FIG. 1, which will be described later, the blower device 4 is a combination of a fan shroud 5 and an axial fan 6. In a one-box type automobile, the refrigerant condenser 2 is arranged in a substantially horizontal direction in front of the front wheel 3 under the floor of the vehicle body 1 as described above, and therefore, when the automobile is braked,
It is easy to receive flying stones from the direction of arrow B in (b). Therefore, it is necessary to take measures against the entry of foreign matter such as flying stones.

1 to 3, a plurality of (for example, four) resin fan blades 7 of the axial fan 6 are connected to a boss portion 8a of a rotary shaft of an electric motor 8 for driving a fan,
The motor 8 is rotated integrally with the rotation shaft (not shown) of the motor 8. 9
Is a cylindrical portion for holding a motor formed in the central portion of the resin shroud 5, and the case 8b of the motor 8 is fixed by screws. In addition, the resin shroud 5
A double cylindrical portion 10 is formed on the outer periphery of the blade 7 of the axial fan 6 with a minute gap therebetween.

Further, a plurality of (12 in the example of FIG. 2) bent plate-like stays 11 are integrally formed so as to connect between the double cylindrical portion 10 and the motor holding cylindrical portion 9. Has been done. In FIG. 2, reference numeral 12 denotes a foreign matter intrusion prevention ring body formed in a large number in a concentric shape between the motor-holding cylindrical portion 9 and the double cylindrical portion 10 of the shroud 5.
Reference numeral a is a cylindrical wall portion located at the outermost peripheral position of the ring body 12. Note that, in FIG. 1, only the ring body 12 adjacent to the inner peripheral side of the cylindrical wall portion 12a is shown, and the other ring bodies 12 are omitted.

The cylindrical wall portion 12a is formed in order to prevent foreign matters such as flying stones from entering the fan shroud 5 from the side. Therefore, the cylindrical wall portion 12a of the cylindrical wall portion 12a has a size larger than that of the ring body 12. The axial length L1 is set long as shown in FIG. 3, and when viewed from the radial direction of the fan shroud 5, the air downstream end of the cylindrical wall portion 12a is close to the air upstream end 10a of the double cylindrical portion 10. The cylindrical wall portion 12a extends to the downstream side of the air to the position where

Further, in order to facilitate resin molding of the fan shroud 5 which will be described later, the cylindrical wall portion 12a is positioned on the inner peripheral side of the inner peripheral surface of the double cylindrical portion 10 in the radial direction of the fan shroud 5. I am doing it. In other words, the cylindrical wall portion 12a is arranged at a position outside the range of the axial projection area of the double cylindrical portion 10. Reference numeral 13 is a mounting bracket that is integrally formed at four locations radially outward of the double cylindrical portion 10, and the shroud 5 is screwed and fixed to the condenser 2 at this bracket 13 portion.

The double cylindrical portion 10 will be described in more detail with reference to FIG. 1. 10b is an inner peripheral cylindrical portion located on the outer periphery of the blade 7 of the fan 6 with a minute gap c (for example, about 3 mm) interposed therebetween. However, in this example, the downstream end 10c of the air is set slightly upstream of the downstream end of the blade 7 as shown in FIG. 1
Reference numeral 0d denotes an outer peripheral side cylindrical portion, which is located on the outer peripheral side of the inner peripheral side cylindrical portion 10b with a predetermined gap.

Reference numeral 10e denotes a ring-shaped connecting portion extending in the radial direction of the fan 6 (shroud 5) so as to connect both end portions of the both cylindrical portions 10b and 10d on the air upstream side. 7 is located slightly downstream of the air upstream end. Also,
The ring-shaped connecting portion 10e is formed in a bell mouth shape having a smooth arc-shaped cross-section in order to make the air flow into the fan 6 smooth, and the bell mouth-shaped air intake port 10f is formed.
Is formed.

Then, the tip of the cylindrical wall portion 12a on the downstream side of the air and the bellmouth-shaped air suction port 10 of the double cylindrical portion 10 are provided.
The gap d that determines the air flow path area with f is set to a size of about 7 mm from the viewpoints of ensuring fan performance and preventing foreign matter such as flying stones from entering, according to experiments and studies by the present inventors. Preferably. Reference numeral 10g denotes a skirt-shaped extension portion, which is connected to an air downstream side end portion of the outer peripheral side cylindrical portion 10d and extends further toward the air downstream side than the air downstream side end portion 10c of the inner peripheral side cylindrical portion 10b. In this example, the diameter is formed in a skirt shape that gradually expands toward the air downstream side. In this way, by forming the extension portion 10g in a skirt shape, the diameter of the end portion 10h can be made sufficiently larger than the diameter of the outer peripheral side cylindrical portion 10d,
As a result, it is possible to increase the sealing area of the heat exchange portion of the condenser 2 by the shroud 5.

When the shroud 5 is manufactured by integral molding of resin, the shroud 5 has the sectional shape enlarged and shown in FIG. 3, so that the upper split mold D and the lower split mold as shown in FIGS. 5 (a) and 5 (b). E
The shroud 5 can be integrally formed with only the two split molds. The arrows in FIG. 5 indicate the die-cutting directions of the respective dies D and E after molding. FIG. 5A shows a portion for forming the stay 11 portion of the shroud 5, and FIG. 5B shows the stay 11 of the shroud 5.
It shows a portion for molding a portion where is not located. In both of these parts, the shroud 5 can be easily resin-molded with only the upper and lower split molds D and E.

Next, the operation of this embodiment having the above-mentioned structure will be described. When the motor 8 is energized and the motor 8 rotates, the blades 7 of the axial fan 6 rotate and air is blown in the direction of arrow a in FIG. 1, and the blown air passes through the heat exchange section of the condenser 2. , Exchanges heat with the refrigerant passing through the tubes of the heat exchange section, cools and condenses the refrigerant. Here, the fan 6 is located on the air upstream side of the condenser 2 and acts as a push-in fan. At this time, in this example, since the shape of the shroud 5 is devised as described below, the fan blowing performance can be effectively improved.

That is, since the cylindrical portion located on the outer periphery of the fan blade 7 is the double cylindrical portion 10, the rigidity of the cylindrical portion becomes high, and therefore the inner peripheral cylindrical portion 10b.
The circularity can be easily maintained, the gap c with the tip of the fan blade 7 can be reduced, and the air blowing performance can be improved. The air can be smoothly expanded and blown along the inner peripheral surface of the skirt-shaped extension 10g immediately after the air downstream end 10c of the inner cylindrical portion 10b, and the air blowing performance can be improved. The skirt-shaped extension portion 10g is used in a blower device having an arrangement layout in which the blast pressure (travel dynamic pressure) generated as the vehicle travels as shown in FIG. It is valid.

The ring-shaped connecting portion 10e is located slightly downstream of the air upstream end of the blade 7,
Moreover, since the bell-mouth-shaped air suction port 10f having a smooth arc-shaped cross-sectional shape is formed in the ring-shaped connecting portion 10e, the outside air can be smoothly introduced into the fan 6 portion, and the blowing performance is improved. Can be improved. According to the device of the present embodiment, the effects of, and are synergized, and the blowing performance can be significantly improved.

Furthermore, the intrusion of foreign matter such as flying stones can be reliably prevented by the following structure. That is, on the air upstream side of the inner peripheral side opening portion of the double cylindrical portion 10, the foreign matter intrusion prevention ring body 12 formed in a large number of concentric circles and the cylindrical wall portion 12a located at the outermost periphery thereof have a finer space. Since it is covered with a net shape (for example, 9 mm), foreign matter that tries to enter from the air upstream side of the inner peripheral side opening of the double cylindrical portion 10 is reliably blocked by the ring body 12 and the cylindrical wall portion 12a. it can.

Further, the cylindrical wall portion 12a can reliably prevent foreign matter from entering from the air upstream side of the double cylindrical portion 10. Unlike the pin of the prior art, the wall portion 12a is connected in a cylindrical shape, so that the mechanical strength thereof can be significantly improved as compared with the pin, so that there is no fear of being damaged by a flying stone or the like. (Second Embodiment) FIGS. 6 and 7 show a second embodiment, which is a skirt-shaped cylindrical portion 1 provided in the shroud 5 of the first embodiment.
This is the case when 0g is abolished. In a passenger car air conditioner, usually, the condenser 2 is arranged vertically upright on the air upstream side of the engine cooling water cooling radiator, so that the ram pressure due to the vehicle running effectively adds to the condenser 2. An increase in the cooling air volume due to this ram pressure can be expected sufficiently.

As described above, in the blower device having the layout in which the increase of the cooling air flow due to the ram pressure can be expected, the skirt-shaped extension portion 10g of the shroud 5 can be eliminated,
As a result, the outer peripheral surface of the outer peripheral side cylindrical portion 10d of the double cylindrical portion 10 becomes linear, and the lower split mold E shown in FIG. Can be die-cut.

Therefore, in the second embodiment, the cylindrical wall portion 12a is arranged further on the outer peripheral side than the outer peripheral surface of the outer peripheral side cylindrical portion 10d of the double cylindrical portion 10. Also in this example, the d dimension (see FIG. 7) is preferably about 7 mm. (Third Embodiment) FIG. 8 is a third embodiment of the present invention, in which the shroud 5 of the second embodiment has an outer peripheral cylindrical portion 1 of a double cylindrical portion 10.
The cylindrical portion 10 corresponding to the bell mouth-shaped air inlet 10f and the inner peripheral side cylindrical portion 10b is eliminated by eliminating the portion corresponding to 0d.
Only b ′ forms an air guiding portion corresponding to the double cylindrical portion 10.

In this example, a bell mouth-shaped air inlet 10f
Since the cylindrical wall portion 12a is arranged further on the outer peripheral side than the maximum outer diameter portion, the shroud 5 can be easily resin-molded with only the upper and lower split molds D and E. (Fourth Embodiment) FIG. 9 shows a fourth embodiment of the present invention, in which the shroud 5 of the first embodiment has an inner cylindrical portion 1 of the double cylindrical portion 10.
By arranging the cylindrical wall portion 12a on the inner peripheral side by a predetermined dimension L2 from 0b, a projection portion having a substantially rectangular cross section shown by hatching D2 is formed in the upper split mold D at the portion of this dimension L2. .

As a result, it is possible to prevent the sharp protruding portion D1 shown in FIG. 5 (b) from being formed on the upper split mold D, and it is possible to prevent the problem of shortening the mold life due to abrasion of the sharp protruding portion. .

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is a front view of the first embodiment.

3A and 3B are an enlarged cross-sectional view and an enlarged perspective view of a main part of FIG.

FIG. 4 (a) is a perspective view showing the location of a condenser of an automobile air conditioner to which the present invention is applied, and FIG. 4 (b) is a view on arrow A of FIG.

5 (a) and 5 (b) are cross-sectional views of essential parts showing the resin mold of the first embodiment.

FIG. 6 is a sectional view of a second embodiment of the present invention.

FIG. 7 is an enlarged sectional view of a main part of the second embodiment.

FIG. 8 is a sectional view of a third embodiment of the present invention.

FIG. 9 is an enlarged sectional view of a main part of a fourth embodiment of the present invention.

[Explanation of symbols]

 2 Condenser 4 Blower 5 Fan Shroud 6 Axial Fan 7 Blade 10 Double Cylinder 10b Inner Cylinder 10d Outer Cylinder 10e Ring Connection 10f Bellmouth Air Inlet 10g Skirt Extension 11 Stay 12 ring body 12a cylindrical wall portion

Claims (6)

[Claims] 1. A fan shroud that supports an axial fan and guides air blown by the axial fan, wherein the cylindrical portion is located on the outer periphery of the axial fan with a minute gap therebetween. Of the bell-mouth shaped air suction port formed on the air upstream side of the portion, the portion facing the tip of the axial fan having a smooth arc-shaped cross section, and the air blown from the cylindrical portion. A foreign matter entry prevention member that is arranged on the upstream side and that prevents foreign matter from entering from the upstream side of the blown air; and a position on the outermost peripheral side of the foreign matter entry prevention member and of the axially projected area of the cylindrical portion. A cylindrical wall portion that is disposed at a position outside the range and that prevents foreign matter from entering from the side of the blown air upstream side, the cylindrical portion, the foreign matter entry prevention member, and the cylindrical wall portion Integrally molded with resin Fan shroud, characterized in that they are. 2. A fan shroud that supports an axial fan and guides air blown by the axial fan, wherein the fan shroud includes an inner cylindrical portion located on the outer periphery of the axial fan with a minute gap therebetween. An outer peripheral side cylindrical portion located on the outer periphery of the inner peripheral side cylindrical portion at a predetermined interval, and a blast air upstream side end portion of both the cylindrical portion so that both end portions are connected in a radial direction of the fan. A ring-shaped connecting portion that extends to a ring-shaped connecting portion, and a bell-mouth-shaped air suction port formed in the ring-shaped connecting portion so that a portion facing the tip end portion of the axial fan has a smooth arc-shaped cross-sectional shape. A foreign matter entry prevention member which is arranged on the upstream side of the blown air from both cylindrical parts and prevents foreign matter from entering from the upstream side of the blown air; and a position on the outermost peripheral side of the foreign matter entry prevention member, Cylindrical part and the connection And a cylindrical wall portion that is arranged at a position outside the range of the axial projection area of the portion to prevent foreign matter from entering from the side of the blast air upstream side, the both cylindrical portions, the connecting portion, A fan shroud in which the foreign matter entry prevention member and the cylindrical wall portion are integrally molded of resin. 3. A skirt-shaped extension portion whose diameter gradually increases in the radial direction is formed at an end portion of the outer peripheral side cylindrical portion on the downstream side of the blown air, and the cylindrical wall portion is formed on the inner peripheral side cylindrical portion. The fan shroud according to claim 2, wherein the fan shroud is arranged so as to be located further on the inner peripheral side. 4. The outer peripheral side cylindrical portion is linearly formed in the axial direction thereof, and the cylindrical wall portion is disposed so as to be located on the outer peripheral side of the outer peripheral side cylindrical portion. The fan shroud according to claim 2. 5. The fan shroud according to claim 1, wherein the foreign matter intrusion prevention member is a ring body formed in a large number in a concentric circle shape. 6. The fan shroud according to claim 1, wherein the foreign matter entry prevention member is integrally formed with a stay that supports an axial fan.