JP2003172528A - Fan grill and outdoor equipment for air-conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem on a conventional form of a fan grill of outdoor equipment for an air-conditioner that air resistance is greater, noises due to the influences of separation or others are loudly generated and limitation exists in reducing the noise level of the outdoor equipment during operation, while maintaining the rotating speed of a fan to assure cooling/heating performance. <P>SOLUTION: This fan grill which is installed on the wake flow side of an air outlet of a blower for blowing air from the fan of the outdoor equipment through the air outlet to the outside comprises a guard lattice having bridges disposed radially from the axial center of the fan in such a manner that the degree of torsion is changed as tending from the center to the radial direction. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly to a fan grill used in an air conditioner and an outdoor unit equipped with the fan grill.

[0002]

2. Description of the Related Art Conventionally, a radial grille or an orthogonal lattice using a wire material having a circular cross section or a plastic having a plate-shaped cross section is used for a fan grill attached to an air outlet side of a fan of an outdoor unit of an air conditioner. It is used as a guard to consider safety.

An outdoor unit of an air conditioner having this fan grill will be described with reference to FIG. As shown in the figure, the air passage 8 of the outdoor unit is composed of a heat exchanger 1, a bell mouth 2, a sheet metal part 3 forming a housing, and a fan grill 4 for safety. A fan 5 and a motor 6 are installed in this air passage space.
The motor 6 is fixed to the housing-constituting sheet metal 3 by a motor support 7.

Here, the flow of air generated by the rotation of the fan 5 sucks in the air outside the outdoor unit from the heat exchanger 1, the air passes through the bell mouth 2, and the fan grill 4 provided in the air blowing section 9 is provided. Is blown out of the outdoor unit.

15 and 16 are front views of a conventional fan grill. Each of them has a grid-like grill shape formed by using a wire material or a plate material, and has an effect as a guard.

[0006]

In the above-mentioned conventional fan grill, since the shape is not desirable for the flow of air generated by the fan, the resistance of the air is large and the generation of noise due to the influence of peeling increases. There is a limit to reducing the noise of the outdoor unit during operation while maintaining the fan rotation speed of the outdoor unit to ensure the cooling and heating capacity of the air conditioner.

The present invention has been made in order to solve the above problems, and by making the cross section of the fan grill into a desired shape, air separation is suppressed, performance is improved by a high air volume, and noise is reduced. The purpose is to obtain a fan grill that aims to become a product. Moreover, it aims at obtaining the fan grill which reduced the air resistance of a crosspiece and secured the guard effect. Moreover, it aims at obtaining the fan grill which secured the mounting strength of a crosspiece. Another object is to obtain a fan grill that improves serviceability and prevents work failures. Another object is to obtain a fan grill with improved design. Another object is to obtain an outdoor unit having a fan grill having the above characteristics.

[0008]

[Means for Solving the Problems] Claim 1 according to the present invention
The fan grill of is a fan grill provided in the blower part of the blower, and is a plate-shaped first grill that constitutes a guard lattice.
Are arranged radially from the axial center side of the fan of the blower, and from the axial center side of the fan so that the longitudinal direction of the cross section orthogonal to the longitudinal direction of the first crossing fan matches the flow direction of the air blown out from the fan. The first crosspiece is twisted in the radial direction.

According to a second aspect of the present invention, in the first aspect, the fan grill is arranged so as to extend in the radial direction from the center.
This is a change in the twist ratio of the crosspiece.

Further, in the fan grill of claim 3 according to claim 1 or 2, the first crosspiece is aligned with the direction of swirl flow of the air blown out from the fan, and the spiral shape is formed from the center side toward the radial direction. It is arranged.

A fan grill according to a fourth aspect of the present invention is the fan grill according to any one of the first to third aspects, wherein the cross section orthogonal to the longitudinal direction of the first rail is at least two different cross sections. .

A fan grille according to a fifth aspect is the fan grille according to any one of the first to fourth aspects, wherein the fan grille is provided with a second crosspiece arranged concentrically.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the second crosspieces are arranged such that the center side of the second grill is rough and the second crosspieces are denser in the radial direction.

A fan grill according to a seventh aspect of the present invention is the fan grill according to any one of the first to fourth aspects, wherein the fan grill has a spiral shape from the center toward the radial direction in accordance with the swirling flow direction of the air blown from the fan. It is equipped with a cross.

According to the eighth aspect of the present invention, in the fan grill according to the seventh aspect, the fan blows out in the longitudinal direction of the cross section orthogonal to the longitudinal direction of the spiral shape of the second rail which is formed in the radial direction from the center. To match the direction of air flow,
The second crosspiece is twisted in the radial direction from the center side.

According to a ninth aspect of the present invention, there is provided a fan grill according to any one of the first to eighth aspects, wherein a cross section orthogonal to the longitudinal direction of the first crosspiece or the second crosspiece is elliptical or has the cross section. Both ends in the longitudinal direction have an arc shape,
The shape is smooth against the flow of air.

A fan grill according to a tenth aspect of the present invention is the fan grill according to any one of the first to eighth aspects.
The cross section orthogonal to the longitudinal direction of the crosspiece is
The blade shape has a reduced thickness from the upstream side to the downstream side.

An eleventh aspect of the present invention is the fan grill according to any one of the first to tenth aspects, wherein a reinforcing member is provided at the center of the fan grill.

According to the twelfth aspect of the present invention, in the eleventh aspect of the present invention, the rotation direction of the fan is clearly indicated on the surface of the reinforcing member.

The fan grill according to claim 13 is the fan grill according to claim 11, the design of which is displayed on the surface of the reinforcing member.

An outdoor unit for an air conditioner according to a fourteenth aspect comprises the fan grill according to any one of the first to thirteenth aspects.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a view of an outdoor unit of an air conditioner of the present invention as viewed from above. In FIG. 1, 1 is a heat exchanger, 2 is a bell mouth, 3 is an outdoor unit housing formed of sheet metal, 4 is a fan grille, 5 is a propeller fan of a centrifugal blower, and 6 is a motor for rotating the fan 5. , 7 is a motor support, 8 is an outdoor unit air passage, and 9 is an air blowing unit 9. The fan grill 4 is on the front of the outdoor unit,
It is installed in the air blow-out part 9 of the blower composed of the fan 5 and the motor 6, and safety is taken into consideration so that fingers etc. do not enter the outdoor unit.

The operation of the outdoor unit of the air conditioner having the above structure will be described. When the air conditioner is in the cooling / heating operation, the motor 5 is used to rotate the fan 5 to perform heat exchange in the outdoor unit. As a result, the air is sucked into the outdoor unit, exchanges heat with the refrigerant in the heat exchanger 1, and is pushed out to the air blowing unit 9 constituted by the bell mouth 2 while passing through the air passage 8, and is then discharged from the fan grill 4 to the outdoor unit. Is blown outside. The flow of air is shown in FIG. 1 by an outline arrow.

Next, the shape of the fan grill 4 and the air flow generated by the fan 5 will be described with reference to FIG. In FIG. 2, 10 is a first rail, 11 is a second rail 11, and 14 is a reinforcing member. The fan grill 4 is the first
The crosspiece 10, the second crosspiece 11, and the reinforcing member 14 are mainly included. In this example, the first rails 10 are arranged radially and linearly in the radial direction from the reinforcing member 14 which is the center side of the fan 5 (in FIG.
In (b), they are arranged discontinuously), and a plurality of second crosspieces 11 are arranged so as to be concentric with the center of the fan 5. A guard grid is composed of the first rail 10 and the second rail 11. When the rotation direction of the fan 5 is counterclockwise rotation (the rotation direction is shown by the black arrow 12 in FIG. 2), although there is a change depending on the characteristics of the fan 5, generally, the air blown out by the fan 5 is the fan 5 It is known that the velocity increases in the radial direction from the axis center of the and the gas is spirally blown outward in the radial direction. The white arrow 13 in FIG.
This state is shown (the direction and the size of the arrow indicate the wind speed).

FIG. 3 is a detailed view of the first rail 10 of the fan grill 4, FIG. 3 (a) is a plan view showing a part of the first rail 10, and FIG. 3 (b). Is this first bar 1
AA, BB, C-C of 0, each cross section, and the air flow by the fan 5 are shown by white arrows 13 (directions and sizes of arrows indicate wind speeds). 2 and 3, the first rail 10 is a plate-shaped rail 10, and is arranged so that its longitudinal direction is in the radial direction from the reinforcing member 14 which is the center side of the fan 5. The respective cross-sections AA, BB, C-C of the direction are directed in the radial direction from the fan center side in this order, and the direction of the air flow and the wind speed of each corresponding part are indicated by arrows in FIG. As shown in 13.

Therefore, the air flow direction forms angles of θA, θB, and θC with respect to the center line 15 of the first rail 10.
The relationship of θA <θB <θC is established, and the longitudinal direction of the cross section of each first rail 10 is made to coincide with the air flow direction. That is, the crosspiece 10 is twisted, and the degree of twist increases from the center side of the fan 5 in the radial direction (in FIG. 3B, the indication of the twist of the first crosspiece 10 is omitted. Exist). Therefore, this blowing angle θA <θB
By giving an optimum twist angle satisfying <θC to the first cross section of the first cross section, that is, by adjusting the longitudinal direction of the cross section of the first cross section of the first cross section of the first cross section of the fan 5 to reduce the air flow resistance. However, the fan grill 4 that suppresses peeling and is capable of reducing noise even in a high air volume is formed. By using the fan grill 4, the fan grill 4 having the above-mentioned effect
An outdoor unit and an air conditioner provided with are obtained. The first
The crosspiece 10 of FIG. 2B is continuous as shown in FIG.
Does not have to be continuous.

In the following embodiments, unless otherwise specified, the outdoor unit of the air conditioner is the same as that described in the first embodiment except the fan grill 4.
The fan grills 4 are changed.

Embodiment 2. The second embodiment will be described with reference to FIG. 4, which is a detailed view of the first rail of the fan grill. In this example, a case where the twist angles of the first rails 10 are different is shown. The description format of FIG. 4 is the same as that of FIG.
As shown in FIG. 4, when the blowing angle of the air blown from the fan has a fan characteristic such that θA, θC <θB, for example, the first crosspiece 10 is optimal to satisfy the angles θA, θC <θB. By imparting the twist, the optimum effect for the fan characteristics can be obtained. That is, by giving the optimum twist angle for the air flow characteristics of the fan 5 used in the outdoor unit to all the cross sections of the first rails 10, the air flow resistance is reduced, separation is suppressed, and quiet noise is achieved even with a high air volume. It is possible to construct an air conditioner that can be realized.

Embodiment 3. The third embodiment of the present invention will be described below with reference to FIG. As described in the first embodiment regarding the blowing direction of the air generated by the fan 5, the blowing directions are different from the center side of the fan 5 in the radial direction. Although the cross section of the first crosspiece 10 is set to the optimum twist angle according to the first and second embodiments, in the present example, the first crosspiece is further adjusted to the swirl flow of the air blow while maintaining the optimum twist angle. 10 are arranged in a radial spiral shape. This makes it possible to further optimize the cross-sectional direction of the first crosspiece 10, reduce the air flow resistance, suppress separation, and obtain an air conditioner having an outdoor unit that is capable of reducing noise even with a high air volume.

Fourth Embodiment The fourth embodiment of the present invention will be described below with reference to FIGS. 6, 7, and 8. As shown in FIG. 6, by giving a cross section of the first crosspiece 10 in which the upstream side and the downstream side of the flow are arcuate to the air flow indicated by the arrow, the air resistance can be reduced and the separation is suppressed. It becomes possible. Similarly, by giving the elliptical cross section shown in FIG. 7, it is possible to suppress air resistance and separation in the same manner, and further reduce noise.

Further, as shown in FIG. 8, the air flow indicated by the arrow has a blade shape with a reduced wall thickness from the upstream side to the downstream side. It is possible to suppress peeling and further reduce noise.

Fifth Embodiment Embodiment 5 of the present invention will be described below with reference to FIG. The fan grill 4 is often formed with a relatively small cross section in order to reduce the resistance of blown air. However, it also functions as a guard to ensure safety, and must maintain a minimum strength. In the case of the fan grill having the shape shown in FIG. 2, when some force is applied to the center perpendicularly to the surface, the first crosspieces 10 arranged radially are fixed to both the fan center side and the radial fixed ends. Bending moment is generated, and it is the part where the force is structurally most applied. Therefore, as shown in FIG. 9, when a plurality of different cross-sectional shapes of the first rail 10 are provided from the center side of the fan 5 toward the radial direction, rigidity is weakened in a portion having weak structural strength. It is possible to provide an increased shape, and it is possible to change a portion where the structural strength is sufficiently satisfied to a smaller cross section having a lower air resistance.

In this example, as shown in the sectional shapes of FIG. 9 (b), both the fixed ends of the first rail 10 on the fan center side and in the radial direction, which are structurally the most applied parts. The cross-sectional shape of the central portion can be made smaller than the cross-sectional shape of the first crosspieces 10 on the side (the bottom and the top in the drawing), the strength can be secured, and the resistance to the air flow can be reduced. That is, by providing the fan grill 4 with different cross sections, it is possible to obtain the fan grill 4 that achieves both improvement in strength and air flow characteristics, an outdoor unit and an air conditioner using the same.

The central portion of the fan grill 4 is concentric with the boss portion of the fan 5 (the central portion of the fan 5 in FIG. 1), and the air blown out from the fan 5 is actually a minute portion. . In this example, the reinforcing member 14 (reinforcing member 14 in FIG. 2) is provided using a portion where the generation of a problematic sound such as a peeling noise can be ignored. This makes it possible to shorten the length of the first crosspiece 10 extending radially,
The rigidity of the entire fan grill 4 can be increased.

Sixth Embodiment The sixth embodiment of the present invention will be described below with reference to FIGS. FIG. 10 shows the reinforcing member 14 of the fan grill 4 (the reinforcing member FIG. 14 of FIG. 2).
Is. By displaying the rotation direction of the fan 5 on the surface of the reinforcing member 14 of the fan grill 4, the serviceability is improved and it is possible to suppress the occurrence of defective work.

Further, as shown in FIG. 11, by using the surface of the reinforcing / reinforcing member 14 of the fan grill 4 as a design display portion, it becomes possible to display a registered trademark, a logo or the like. Further, depending on the displayed contents, it is possible to call the user's attention in use, and it is possible to request further design.

Embodiment 7. The seventh embodiment of the present invention will be described below with reference to FIGS. 6, 7, and 8. In this example,
The second crosspiece in FIG. 1 is provided with the cross-sectional shape shown in FIGS. 6, 7, and 8. As shown in FIG. 6, by giving a first cross section of the flow of air indicated by the arrow, which has arcs on the upstream side and the downstream side of the flow, air resistance can be reduced and separation can be suppressed. It will be possible. The same effect can be obtained by providing the elliptical cross section shown in FIG. Further, as shown in FIG. 8, the air flow indicated by the arrow is made to have a blade shape in which the wall thickness is reduced from the upstream side to the downstream side, thereby similarly suppressing air resistance and separation. It becomes possible to further reduce noise.

Embodiment 8. The eighth embodiment of the present invention will be described below with reference to FIG. This example shows a case where the cross-sectional arrangement of the second crosspiece is different. When the first crosspieces 10 of the fan grill 4 are arranged radially, the central side of the fan is densely arranged, and the opening becomes coarser and wider toward the radial direction. Therefore, the second bars 11 are made closer to each other on the center side, and the first bars 10 are arranged to be closer to each other in the radial direction where the intervals become coarser, so that the function as a guard is not impaired. The air flow characteristics can be improved.

Ninth Embodiment The ninth embodiment of the present invention will be described below with reference to FIG. The case where the cross-sectional arrangement of the second crosspiece 11 is different will be described below. As described in the first embodiment regarding the blowing direction of the air generated from the fan 5, the blowing directions are different from the center side of the fan 5 in the radial direction. In this example, when the first crosspieces 10 are radially arranged linearly, the second crosspieces 11 are aligned with the swirling flow of the air blowing and arranged in a radial spiral shape. As a result, the second cross section direction can be optimized, the air flow resistance can be reduced, separation can be suppressed, and an air conditioner capable of reducing noise even with a high air volume can be constructed.

Further, similar effects to the second crosspiece 11 can be obtained by giving an optimum twist angle to the air flow direction in the same manner as the first crosspiece 10 described in the first embodiment. To be

The fan grill 14 of the present invention can be used for an outdoor unit and an indoor unit of an air conditioner. In each, the air flow resistance is reduced, the air volume is increased, and sound is generated by passing through the fan grill 4. It can be reduced.

[0042]

The fan grill according to claim 1 of the present invention is a fan grill provided in the blow-out portion of a blower, wherein the plate-shaped first rails forming the guard grid are the shafts of the fan of the blower. Radially arranged from the center side, the cross section orthogonal to the longitudinal direction of the first crosspiece is aligned with the first crosspiece in the radial direction from the axial center side of the fan so that the longitudinal direction of the cross section matches the flow direction of the air blown by the fan. Since the twist is imparted, the resistance generated by the flow of the air passing through the first crosspiece can be reduced, and further, the separation of the air can be suppressed to enable the noise reduction.

According to a second aspect of the present invention, in the first aspect, the fan grille has the first portion in the radial direction from the center.
Since the twist ratio of the crosspiece is changed, the twisting characteristic of the first crosspiece that matches the characteristic of the general fan can be obtained, and the resistance of the air flow passing through the first crosspiece can be reduced, By suppressing the separation of air, it is possible to reduce noise.

According to a third aspect of the present invention, in the fan grill according to the first or second aspect, the first crosspiece is aligned with the swirling direction of the air blown from the fan, and the spiral shape is formed from the center side toward the radial direction. Since they are arranged, the flow resistance of the air can be further reduced, and the separation of the air can be suppressed to enable noise reduction.

Further, in the fan grill of claim 4 according to any one of claims 1 to 3, since the cross section orthogonal to the longitudinal direction of the first crosspiece has at least two different cross sections, A portion having low strength can have a shape with increased rigidity, and a portion having sufficient structural strength can have a smaller cross section with less air resistance.

The fan grill of claim 5 according to any one of claims 1 to 4, wherein the fan grill is provided with the second crosspiece arranged concentrically, so that the guard effect of the fan grill is increased. .

Further, in the fan grill of claim 6 according to claim 5, the arrangement of the second crosspiece is rough on the center side of the fan grill and is denser in the radial direction. Air resistance can be reduced without impairing function.

A fan grille according to a seventh aspect of the present invention is the fan grill according to any one of the first to fourth aspects, wherein a second spiral shape is formed in a radial direction from the center in accordance with the swirling flow direction of the air blown from the fan. Since the crosspieces are provided, the guard effect of the fan grill can be increased and the air resistance can be reduced.

According to the eighth aspect of the present invention, there is provided a fan grill according to the seventh aspect, wherein a longitudinal direction of a cross section of the second crosspiece, which has a spiral shape from the center in the radial direction, is orthogonal to the longitudinal direction of the spiral shape of the fan. To match the direction of air flow,
Since the second crosspiece is twisted in the radial direction from the center side, the guard effect of the fan grill can be increased and the air resistance can be further reduced.

According to a ninth aspect of the present invention, there is provided a fan grill according to any one of the first to eighth aspects, wherein the cross section of the first crosspiece or the second crosspiece is orthogonal to the longitudinal direction or has an elliptical shape. Both ends in the longitudinal direction have an arc shape,
Since the shape is smooth with respect to the flow of air, it is possible to further reduce noise.

A fan grille according to a tenth aspect is the fan grille according to any one of the first to eighth aspects.
The cross section orthogonal to the longitudinal direction of the crosspiece is
Since the blade shape is reduced in thickness from the upstream side to the downstream side, it is possible to further reduce noise.

Further, in the fan grill of claim 11 according to any one of claims 1 to 10, since the reinforcing member is provided at the center of the fan grill, the mounting strength of the crosspiece can be secured.

Further, in the fan grill of claim 12, since the rotating direction of the fan is clearly indicated on the surface of the reinforcing member on the surface of the reinforcing member in claim 11, serviceability is improved,
Occurrence of defective work can be prevented.

Further, in the fan grill of the thirteenth aspect, since the design is displayed on the surface of the reinforcing member in the eleventh aspect, the designability can be improved.

Further, since the outdoor unit of the air conditioner according to claim 14 is equipped with the fan grill according to any one of claims 1 to 13, the air having the characteristics of the fan grill as described above, respectively. The outdoor unit of the harmony machine can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view of an outdoor unit of an air-conditioning apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a front view of the fan grill of the outdoor unit of the air-conditioning apparatus according to Embodiment 1 of the present invention.

FIG. 3 is a detailed view of the first rail of the fan grill of the outdoor unit of the air-conditioning apparatus according to Embodiment 1 of the present invention.

FIG. 4 is a detailed view of the first rail of the fan grill of the outdoor unit of the air-conditioning apparatus according to Embodiment 2 of the present invention.

FIG. 5 is a front view of a fan grill of an outdoor unit for an air-conditioning apparatus according to Embodiment 3 of the present invention.

FIG. 6 is a cross-sectional view of a crosspiece of an outdoor unit of an air conditioner according to Embodiments 4 and 7 of the present invention.

FIG. 7 is a cross-sectional view of another crosspiece of the outdoor unit of the air-conditioning apparatus according to Embodiments 4 and 7 of the present invention.

FIG. 8 is a cross-sectional view of a crosspiece of the outdoor unit of the air-conditioning apparatus according to Embodiments 4 and 7 of the present invention.

FIG. 9 is a detailed view of the first rail of the fan grill of the outdoor unit for an air-conditioning apparatus according to Embodiment 5 of the present invention.

FIG. 10 is a front view of a grille reinforcing plate of an outdoor unit for an air-conditioning apparatus according to Embodiment 6 of the present invention.

FIG. 11 is a front view of a grille reinforcing plate of an outdoor unit for an air-conditioning apparatus according to Embodiment 6 of the present invention.

FIG. 12 is a front view of a fan grill of an outdoor unit for an air-conditioning apparatus according to Embodiment 8 of the present invention.

FIG. 13 is a front view of a fan grill of an outdoor unit for an air-conditioning apparatus according to Embodiment 9 of the present invention.

FIG. 14 is a side view of an outdoor unit of a conventional air conditioner.

FIG. 15 is a front view of a fan grill of an outdoor unit of a conventional air conditioner.

FIG. 16 is another front view of the fan grill of the outdoor unit of the conventional air conditioner.

[Explanation of symbols]

4 fan grills, 5 fans, 5 and 6 blowers, 9
Blowing part, 10 First crosspiece, 11 Second crosspiece, 14
Reinforcement member.

Claims (14)

[Claims] 1. A fan grill provided in a blower part of a blower, wherein plate-shaped first rails constituting a guard grid are arranged radially from a shaft center side of the fan of the blower,
The first bar is twisted in the radial direction from the axial center side of the fan so that the longitudinal direction of the cross section orthogonal to the longitudinal direction of the first bar matches the flow direction of the air blown from the fan. A fan grill characterized by that. 2. The fan grill according to claim 1, wherein the degree of twist of the first crosspiece is changed from the center toward the radial direction. 3. The method according to claim 1, wherein the first crosspieces are arranged in a spiral shape in a radial direction from the center side in line with a swirling direction of air blown from the fan. The listed fan grill. 4. The fan grill according to claim 1, wherein the cross section of the first crosspiece that is orthogonal to the longitudinal direction is at least two or more different cross sections. 5. The fan grill comprises a second crosspiece arranged concentrically.
A fan grill according to any one of. 6. The fan grill according to claim 5, wherein the second bars are arranged such that the center side of the fan grill is rough and the second bars are denser in the radial direction. 7. The first grill according to claim 1, wherein the fan grill includes a second crosspiece which is spirally formed from a center thereof in a radial direction in accordance with a swirling flow direction of air blown from the fan. The fan grill according to any one of 4. 8. The center side so that the longitudinal direction of the cross section orthogonal to the longitudinal direction of the spiral shape of the second crosspiece formed in a spiral shape from the center to the radial direction matches the flow direction of the air blown out from the fan. The fan grill according to claim 7, wherein the second crosspiece is twisted in a radial direction from the. 9. A cross section orthogonal to the longitudinal direction of the first crosspiece or the second crosspiece is formed into an elliptical shape, or both ends of the cross section in the longitudinal direction have an arc shape, and the cross section with respect to the air flow is It has a smooth shape.
The fan grill according to claim 8. 10. A cross section orthogonal to the longitudinal direction of the first rail or the second rail has a blade shape in which the wall thickness is reduced from the upstream side to the downstream side with respect to the air flow. The fan grill according to any one of claims 1 to 8. 11. The fan grill according to claim 1, wherein a reinforcing member is provided at a central portion of the fan grill. 12. The fan grill according to claim 11, wherein the rotation direction of the fan is clearly indicated on the surface of the reinforcing member. 13. The fan grill according to claim 11, wherein a design is displayed on the surface of the reinforcing member. 14. An outdoor unit for an air conditioner, comprising the fan grill according to any one of claims 1 to 13.