WO2002052202A1

WO2002052202A1 - Air conditioner

Info

Publication number: WO2002052202A1
Application number: PCT/JP2001/011470
Authority: WO
Inventors: Kenji Okuda
Original assignee: Toshiba Carrier Corporation
Priority date: 2000-12-26
Filing date: 2001-12-26
Publication date: 2002-07-04
Also published as: CN1483125A; CN1216255C; JP2002195610A; KR100529547B1; JP4482224B2; EP1347245A1; EP1347245B1; KR20030067720A; AU2002217516B2; EP1347245A4

Abstract

An air conditioner comprising, provided on an enclosure (10), an air outlet (18) for discharging and guiding to the outside heat-exchanged air after supplied to an outdoor heat exchanger (14) and heat-exchanged there, and a fan guard (20) attached to the air outlet (18) to ensure a ventilating area for heat-exchanged air and preventing entry of objects to the inside, wherein the fan guard (20) comprises, integrally molded by using a synthetic resin material, a plurality of circular ribs (24) concentrically provided at a specified pitch, and a plurality of radial strips (25) crossing the circular ribs (24) and provided radially from the center to the outermost periphery of the ribs (24), the radial strips (25) being provided on concentric circles between the ribs (24) with their arrangements on the concentric circles staggered alternately.

Description

Specification

Air conditioner

Technical field

The present invention relates to an air conditioner, and more particularly to an air conditioner, which is attached to an air outlet that discharges and guides heat exchange air that has been blown to a heat exchanger and exchanges heat to the outside, and includes a concentric circular beam and a radial beam. The improvement of the fangand composed of

Background art

2. Description of the Related Art Separate type air conditioners are widely used in which an indoor unit disposed in a room to be air-conditioned and an outdoor unit disposed outside are communicated with refrigerant pipes or the like.

In particular, in an outdoor unit, a heat exchanger and an outdoor blower are arranged opposite to each other in a housing that is a unit body. An inlet is provided on the back and side surfaces of the housing, and an outlet is provided on the front of the housing.

In particular, since the air outlet is provided on the front side of the housing, it is conceivable that a person accidentally puts a finger or an object into the housing from here. Therefore, a fangard is installed at this outlet to prevent the intrusion of fingers and objects to the extent that the ventilation of the heat exchange air is not impaired.

Conventionally, the front of the outdoor unit is formed, for example, as shown in FIG. An outlet 102 is opened at the front of the housing 101, and a fang 103 is fitted into this. The fang 10 3 has a plurality of circular bars 104 provided concentrically at a predetermined pitch, and intersects with the circular bars 104 and has a circular shape. The bar 104 comprises a plurality of radial bars 105 provided radially from the center to the outermost periphery.

The circular bar 104 and the radial bar 105 are molded from, for example, a synthetic resin material. Also, the radial bars 105 become narrower as they approach the center of the circular bars 104 due to their geometric characteristics. Naturally, the spacing between the radial bars 105 is designed to maintain the required strength at the outermost periphery of the fang 103.

As described above, in the conventional fangade 103, the interval between the radial bars 105 is set based on the design strength required at the outermost periphery, so that the center of the circular bar 104 is provided. As it gets closer, it becomes denser than the required interval calculated from the fangard intensity. As a result, there is a radial bar 105 having a large resistance to the wind flow.

In addition, since the synthetic resin material constituting the circular bar 104 and the radial bar 105 is weak in terms of strength, in order to increase the strength of these bars, thick plates are used. Adopted. As a result, there were problems such as the actual ventilation area being narrowed and ventilation resistance increasing.

Disclosure of the invention

An air conditioner according to an aspect of the present invention is an air conditioner in which a heat exchanger and a blower that blows heat exchange air to the heat exchanger to exchange heat are provided in the housing. An air outlet that discharges and guides the heat exchange air that has been blown to the heat exchanger and exchanges heat, and an air outlet that is attached to this air outlet and that secures a ventilation area for the heat exchange air, allowing the air to enter inside. Fangers to prevent intrusion The fangard is formed integrally using a synthetic resin material, and is provided with a plurality of circular bars provided concentrically at a predetermined pitch and intersecting with the circular bars. A plurality of radial bars are provided radially from the center of the circular bar to the outermost portion, and the radial bars are provided alternately at concentric pitches on concentric circles between the circular bars. ing.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic cross-sectional plan view of an outdoor unit constituting an air conditioner according to an embodiment of the present invention.

FIG. 2A to FIG. 2C are diagrams for explaining the shape structure and air blowing characteristics of a propeller fan constituting the outdoor blower according to the embodiment.

FIG. 3A is a front view of an outdoor unit having a fan guard according to the first embodiment.

FIG. 3B is a front view illustrating the features of the circular and radial crosspieces constituting the fangard.

FIG. 4 is a front view of an outdoor unit having a fan guard as a modified example of the first embodiment.

FIG. 5 is a diagram showing the characteristics of the operating noise with respect to the amount of air blown by the outdoor blower when the fangard according to the first embodiment and the fangard having a conventional structure are provided.

FIGS. 6A and 6B are front views of an outdoor unit provided with a fang as a different modification from the first embodiment.

• FIG. 7A is a front view of an outdoor unit having a fan guard according to the second embodiment. FIG. 7B is a front view for explaining the features of the circular bar and the radial bar constituting the fangard.

FIG. 8 is a front view of an outdoor unit having a fangage as a modification of the second embodiment.

FIG. 9 is a front view showing a part of a fangard as a further modified example in the second embodiment.

FIGS. 10A to 10D are diagrams for explaining the shape structure and cross-sectional shape of the circular bar and the radial bar applied to the first and second embodiments ₍ FIG. 11A is a technical reference). The front view of the outdoor unit having the fang according to the example.

FIG. 11B is a front view illustrating the features of a circular bar and a radial bar constituting the fangard.

Figure 12 is a front view of an outdoor unit with a fangard. FIG. 13 is a front view showing an outdoor unit having a conventional fan guard.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an outdoor unit 1 in a separate type air conditioner having an indoor unit and an outdoor unit.

In the figure, reference numeral 10 denotes a casing forming a unit body, and the inside of the casing 10 is divided into a heat exchange room 12 and a machine room 13 by a partition plate 11. An outdoor heat exchanger 14 formed in a plane L shape is arranged in the heat exchange chamber 12, and an outdoor blower 15 is arranged opposite to the outdoor heat exchanger 14.

The compressor room 16 is located in the machine room 13. It is connected so as to form a refrigeration cycle circuit via a refrigerant pipe with the heat exchanger 14 and an indoor heat exchanger and the like arranged in an indoor unit (not shown).

The outdoor blower 15 includes a fan motor 15 m and a propeller fan 15 f fitted to a rotation shaft of the fan motor 15 m. Since the propeller fan 15 f is mounted facing the front side of the housing 10, the front side of the housing 10 is the blowout side, and the rear side is the suction side. Since the outdoor heat exchanger 14 is interposed between the rear side of the casing 10 and the propeller fan 15f, it is located on the suction side of the propeller fan 15f.

On the other hand, a suction port 17 is provided in each of the casings 10 on the rear side and the side face of the heat exchange chamber 12. That is, by driving the outdoor blower 15, external air is sucked into the housing 10 through the suction port 17.

An air outlet 18 is provided in the housing 10 on the front side of the heat exchange chamber 12. By driving the outdoor blower 15, the external air sucked from the suction port 17 passes through the outdoor heat exchanger 14 and exchanges heat, and is blown out from the outlet 18. It has become.

The outlet 18 is fitted with a later-described fangard 20 to reliably prevent intrusion of a finger or an object. Of course, the dimensions are designed so as not to cause the resistance of the heat exchange air passing through the outlet 18 to the ventilation.

The propeller fan 15 f is shown in Fig. 2A, Fig. 2B and Fig. 2C. As shown in Fig. 2B, when driven in the clockwise direction (arrow 矢印) in Fig. 2B, as shown in Fig. 2C, the direction Va and the direction V from the center axis K to the outer periphery are obtained. The strength of the outlet flow increases in the order of b and direction Vc. Also, as shown in Fig. 2A, when the blowout angle increases from small (parallel to the axis) to large (large angle with the axis) in the order of Wa, Wb, and Wc, In this order, the strength of the outlet flow increases.

Next, the fangard 20 will be described in detail. FIG. 3A shows the front side of the housing 10, and the fang 20 of the first embodiment is fitted in the air outlet 18. This fang 20 is composed of a plurality of crosspieces 2 integrally formed using a synthetic resin material.

It consists of one force.

The crosspiece 21 has a plurality of circular crossings 24 provided concentrically at a predetermined pitch from the center to the outermost circumference, and intersects with the circular crossings 24. From the center to the outermost part! : It is composed of a plurality of radial bars 25 provided radially. The radial bar 25 is composed of three types of radial bars 25a to 25c depending on its length.

The spacing between the radial bars 25 adjacent to each other along the circumferential direction basically increases gradually from the center of the circular bar 24 to the outermost periphery (from the outermost portion of the circular bar 24). Is gradually reduced over the center), but is provided here as described below.

That is, radial bars 25 on the same straight line from the outermost peripheral portion of the circular bar 24 to the center are provided at every other pitch of concentric circles formed between the circular bars 24. Circumferentially adjacent release The radial bar 25 is formed by one pitch of a concentric circle formed between the circular bars 24 from the concentric circle between the circular bars 24 shifted by one pitch toward the center of the circular bar 24. It is provided everywhere. From this, the radial bars 25 are provided alternately on the concentric circles adjacent to the circular bar 24.

Then, as will be described later, when adjacent radial bars 25 on a predetermined concentric circle between the circular bars 24 are at a predetermined interval, the end of one radial bar 25 is cut off. The future part will be thinned out.

More specifically, this will be described with reference to FIG. 3B. Radial bars 25b and 25b are provided on both sides in the circumferential direction of the radial bar 25a, and when the radial bars 25c and 25c are arranged adjacently on both sides in the circumferential direction, a circular bar is provided. The radial bar 25a and the radial bar 25c are arranged on the same concentric circle Ra between the 24, and the radial bar 25b is not located on the concentric circle.

The radial bar 25b is arranged on a concentric circle Rb shifted by one pitch from the concentric circle Ra between the circular bars 24 on which the radial bars 25a and 25c are arranged. Further, radial bars 25a and 25c are arranged on the concentric circle Ra shifted by one pitch from the concentric circle Rb, and thereafter, the radial bars 25b and 25a, 25 c are arranged for each of the concentric circles Ra and Rb between the circular bars 24, that is, at one pitch. Therefore, the radial bars 25a, 25c and the radial bars 25b are alternately arranged.

Here, in the outermost concentric circle R a, Q is the circumferential distance between the adjacent radial bars 25 a and 25 c. For this reason, In the outermost concentric circle R b, the circumferential distance between adjacent radial bars 25 b, 25 b is slightly smaller than Q. In the inner concentric circle Ra, the circumferential distance between the adjacent radial bars 25a and 25c is further reduced. Finally, at the position where the circumferential distance between the adjacent radial bars 25b, 25b is approximately Q / 2, the ends of the radial bars 25b, 25b Be missing. The remaining radial bars 25a and 25c are extended toward the center of the circular bar 24 as they are. Then, the circumferential interval between the radial bars 25a and 25c gradually decreases. Further, at the position where the circumferential distance between the adjacent radial bars 25a and 25c is approximately Q / 2, the end of the radial bar 25c is missing. In this way, the chipping is repeated under the above conditions until the remaining radial bar 25 is extended to the center of the circular bar 24.

In other words, a radial bar 25b is provided up to the concentric circle R1, and the end of the radial bar 25b is omitted. A radial bar 25c is provided up to the position of the concentric circle R2, and the end of the radial bar 25c is cut off, and the radial bars 25a, 25a are spaced from each other at a predetermined interval at the innermost peripheral position. Thus, the leading end is cut off.

In addition, only the radial bar 25a is arranged on the concentric circle R3 one pitch inside from the end of the radial bar 25b of the concentric circle R1, and the radial bar 25c is not arranged. The radial bars 25 c are arranged at every other pitch from the concentric circle R 4 at the inner side of the pitch.

That is, the radial bars 25a, 25c and the radial bars 25b are alternately arranged from the outermost periphery of the circular bar 24. The radial bars 25a and the radial bars 25c are alternately arranged on the center side from the concentric circle R1 of the missing radial bar 25b.

As a result, the interval between the radial bars 25 on the concentric circle gradually narrows from the outermost periphery of the circular bar 24 to the center, but the end of the radial bar 25 b that is formed first is formed. On the concentric circle R3 one pitch inside from the part, the interval between the radial bars 25a-25a increases to almost the same as the interval Q at the outermost periphery. Then, the mutual interval between the radial bars 25c and the radial bars 25a provided alternately from the concentric circle R4 one pitch inside of the concentric circle R3 to the center portion is gradually reduced. .

In this way, the distance between the radial beams 25 that secures the required strength as the fangard 20 can be set wider, so that the radial beams 25 that have a large resistance to the wind flow can be set. Can be reduced. Specifically, it is as shown in the table below.

Therefore, it matches the strength of the blowout flow of the propeller fan 15f, and corresponds to the blowout characteristics of the outdoor blower 15 to reduce the ventilation resistance in the fanguard 20 and reduce the outdoor blower. A large improvement in the airflow characteristics of 15 can be obtained, leading to an improvement in heat exchange performance.

FIG. 4 shows a fangard 30 as a modified example of the above-described first embodiment. In this case, two sets of the fangards 20 previously described in FIG. 3A are provided at the same time, and the upper and lower sides are turned symmetrically.

As an internal configuration not shown, it is basically explained first with reference to FIG. Although it is not different from the conventional one, it is used as an outdoor unit in a relatively large air conditioner, so two sets of outdoor heat exchangers are arranged facing each of the upper and lower fanguards. Or, a large outdoor heat exchanger spanning the upper and lower fangards will be installed. In addition, since the outdoor blowers are arranged in opposition to the upper and lower fan guards, the same operation and effect as described above can be obtained.

FIG. 5 shows an outdoor unit provided with the fangard 20 shown in FIG. 3A and an outdoor unit provided with the fangard 3 having the conventional configuration described above with reference to FIG. 13. It is the result of measuring the change of the operation noise with respect to the air volume of the outdoor blower 15.

It can be seen that the degree of the operation noise with respect to the amount of air blown by the same outdoor blower 15 is lower in the case of the present invention N1 than in the case of the conventional configuration N2.

FIG. 6A shows a fangard 40 as a modification of the first embodiment. In this figure, the circular bar 44 corresponds to the circular bar 24 in FIGS. 3A and 3B described above, and the radial bar 45 corresponds to the radial bar 25 in FIGS. 3A and 3B described above. It is provided correspondingly.

That is, the radial bars 45 are arranged under the same conditions as the radial bars 25 described above with respect to the circular bars 44 formed concentrically. However, all of the radial bars 45 here are: The circular bar 44 is arranged at a predetermined angle with respect to the center of the bar.

Even in the fangard 40 having such a configuration, the effect is exactly the same as that of the fangard 20 described above. Further, all the radial bars 45 are formed so as to be inclined at a predetermined angle with respect to the center of the circular bar 44, but the present invention is not limited to this. It may be formed in a spiral shape as a whole.

FIG. 6B shows a fangard 50 as a further modification of the second embodiment. Fangard 50 includes a first cross section 51 and a second cross section 52. The first cross section 51 and the second cross section 52 are distinguished by a predetermined pitch circle having a diameter of about half of the outermost circle, the outer cross section being the first cross section 51, and the inner cross section being the first cross section. It has 2 piers 5 2. The first cross section 51 has a concentric circular cross section 53 and a conventional pitch circle extending from the outermost periphery of the circular cross section 53 toward the center to a predetermined pitch circle. Similar equally spaced radial contacts 54 are provided. In the second beam section 52, concentric circular beams 55 are provided, and radial beams 56 are provided alternately with respect to concentric circles between the circular beams 55 from the pitch circle position to the center. . Effectively, it is exactly the same as Fangard 20 described above.

FIG. 7A shows a fangard 60 according to the second embodiment. This fangard 60 is composed of a plurality of circular bars 64 provided concentrically at the same pitch from the outermost periphery to the center, and radial bars 64 provided intersecting these circular bars 64. It consists of 5 and. However, the radial bar 65 has a deformed radial shape depending on the arrangement conditions of the radial bar 65 as described later.

The radial bars 6 5 are arranged at equal intervals on a concentric circle between the circular bars 64, and the radial bars 6 on this concentric circle are arranged. The number of lines 5 is gradually reduced by one for each pitch of the concentric circles from the outermost periphery of the circular beam 64 toward the center.

As a result, the radial bar 65 has a linear portion 65 a formed linearly from the outermost peripheral portion to the center of the circular bar 64, and a linear portion 65 a Are formed alternately on concentric circles between the circular bars 64 except for the parabolic portions 65b and the linear portions 65a and the parabolic portions 65b which are formed in a parabolic shape on both sides of the It is composed of a staggered part 65 c and a cap.

In FIG. 7B, the number of the radial bars 65 can be more specifically described from the center to the outer periphery of the circular bar 64 in order to explain the number. One radial bar 65 is provided in a straight line from the center of the circular bar 64 to the outermost periphery, and this is defined as a linear portion (reference radial bar) 65a. On the concentric circle R7 between the circular bars 64 on the outer side of the pitch by one pitch from the center of the circular bar 64, a total of seven radial bars 65 are inserted at regular intervals, including the linear portion 65a. Be placed. Further, on the concentric circle R8 on the outer peripheral side of one pitch further from this, a total of eight radial bars 65 including the linear portions 65a are arranged at equal intervals.

In addition, on the concentric circle R 9 on the outer circumference side of one pitch from this, nine radial bars 65 are arranged at equal intervals including the linear portion 65 a, and the outer circumference of one pitch is further increased. On the side concentric circle R10, ten radial bars 65 are arranged at equal intervals, including the linear portion 65a.

In this way, the number of radial bars 65 on the concentric circle between the circular bars 64 on the outer circumference of one pitch is increased by one. In the figure, the outermost concentric circle R 28 28 radial bars 65 are arranged at equal intervals including the part 65a. On the concentric circle formed outside the concentric circle R 28, the intervals between the radial bars 65 are set at the same rate of change! /

As a result, the radial bar 65 is formed by a straight portion 65a formed linearly from the outermost peripheral portion to the center of the circular bar 64, and the linear portion 65a. Parabolic portions 65 b and 65 c on both sides are formed.

Therefore, it matches the strength of the blowout flow of the propeller fan 15 f and has a form corresponding to the blowout characteristics of the outdoor blower 15, so that the ventilation resistance in the fanguard 60 is reduced and the outdoor blower 1 The air blowing characteristics of 5 can be greatly improved, which leads to the improvement of heat exchange performance.

FIG. 8 shows a fangade 70 as a modified example of the above-described second embodiment. Here, two sets of the fangards 60 previously described in FIG. 7A are provided at the same time, and the upper and lower sides are oriented so as to be symmetrical.

The internal configuration, not shown, is basically the same as that described above with reference to FIG. 1, but since it is adopted as an outdoor unit in a relatively large air conditioner, Two sets of outdoor heat exchangers are arranged facing the upper and lower fanguards, respectively, or a large outdoor heat exchanger is arranged across the upper and lower fanguards. In addition, since the outdoor blower is disposed to face each of the upper and lower fan guards, the same operation and effect as described above can be obtained. FIG. 9 shows a fangade 80 as a further modification of the second embodiment. This is a part of the staggered portion 85c in which the parabolic portion 85b and the staggered portion 85c are formed based on the straight portion 85a as described above. It is a modification of only

Specifically, a total of seven radial bars 85 including the reference radial bars 85a are placed on a concentric circle R8 one pitch outside the concentric circle R7, which is arranged at equal intervals, and alternately. The part corresponding to the part 85c is arranged with the interval between the radial bars 85 widened.

Similarly, in the concentric circles R9 and R10, the radial bars 85 at the portions corresponding to the staggered portions 85c are arranged so as to be widened. In the figure, the part where the interval between the radial bars 85 is widened is hatched.

Therefore, the number of radial bars 85 that is greater than the strength required for the fangard 80 is not required, and the number of radial bars 85 can be reduced to the utmost limit, and the ventilation resistance of the fangard 80 can be reduced. .Reduction and a significant improvement in the ventilation characteristics of the outdoor blower 15 can be achieved, leading to improved heat exchange performance.

In Table 1 below, let the radius of the outermost part of the circular beam be, for example, La, and then reduce the radius of the circular beam toward the center in the order of Lb, Lc, Ld, ... Lw. In this case, the number of radial bars on the concentric circle between the circular bars is shown. Therefore, the number of radial bars in the fangard configuration described so far based on the drawings does not necessarily correspond to the number of radial bars in Table 1. Fanga Fanga Fanga

Radius 1do 1do 1do Conventional example

2 0 6 0 9 0

L a 2 4 3 2 3 2 3 2

L b 2 4 3 1 3 2 3 2

L c 2 4 3 0 3 2 3 2

L d 2 4 2 9 3 2 3 2

Le 2 4 2 8 3 2 3 2

L f 2 4 2 7 3 2 3 2

L g 2 4 2 6 3 2 3 2

L h 2 4 2 5 3 2 3 2

L i 2 4 2 4 3 2 3 2

L j 2 4 2 3 3 2 3 2

L k 2 4 2 2 3 2 3 2

L 1 2 4 2 1 3 2 3 2

L m 1 2 2 0 1 6 3 2

L n 1 2 1 9 1 6 3 2

L o 1 2 1 8 1 6 3 2

L p 1 2 1 7 1 6 3 2

L q 1 2 1 6 1 6 3 2

L r 1 2 1 5 1 6 3 2

L s 6 1 4 8 3 2

L t 6 1 3 8 3 2

L u 6 1 2 8 3 2

L v 6 1 1 8 3 2

L w 6 1 0 8 3 2

3 9 0 4 8 3 5 2 0 7 3 6 In the column of the conventional example in the table, from the outermost peripheral portion La to the central portion Lw:! : For example, 32 radial bars are required on the concentric circle between all the circular bars, and the total is 736.

On the other hand, the number of the radial bars 25 described in the column of Fangard 20 is the same as that of the radial bars 25 as described above with reference to FIG. 3A. This is a configuration in which they are arranged alternately. The number of radial bars 25 extending from the outermost peripheral portion La to the center portion Lw of the circular bar 24 is, for example, 24 types of gnolap, 12 gnolaps, and 6 types of gnolaps. Divide into groups. The total number is 390, and the ratio of the number of radial bars 25 is 0.53, compared to the 736 of the conventional structure.

The number of radial bars 65 described in the column of Fangard 60 is a circular bar 64 extending from the outermost peripheral portion La to the center portion Lw as described above with reference to FIG. 7A. This is a configuration in which the number of radial bars 65 is reduced by one.

In the outermost portion La, 32 wires are required, but by reducing the number of wires by 1 for each pitch, the minimum is 10 wires. The total number is 483, which is larger than in the first embodiment, but can be significantly reduced as compared with the conventional example.

FIGS. 10A to 10D are diagrams showing examples of specific shapes of a circular bar and a radial bar. The circular bars 24, 44, 54, 64, 84 and the radial bars 25, 45, 55, 56, 65, 65 Although the method can be applied to all of the items 85, the following describes the circular bar 24 and the radial bar 25 in the fangard 20.

That is, a circular bar 24 is provided in parallel with a predetermined interval, and a radial bar 25 is provided in a direction orthogonal to the circular bar 24. The circular bar 24 has a cross-sectional shape. It has a substantially flat shape or a substantially wing shape. Therefore, the ventilation resistance between the circular bars 24 is reduced, and the noise due to the separation of the airflow is increased. Suppressing this can lead to a significant improvement in airflow characteristics.

The cross section of the radial bar 25 has a circular shape, a substantially flat shape, or a substantially wing shape. Therefore, it is possible to increase the strength without substantially increasing the ventilation resistance of the fangard 20, and to thereby suppress the cross-sectional dimension of the circular bar 24.

FIG. 11A and FIG. 11B are diagrams showing a technical reference example. FIG. 3A shows the front side of the housing 10, and a fan guard 90 is fitted into the air outlet 18. This fangard 90 is composed of a plurality of crosspieces integrally formed using a synthetic resin material.

Specifically, a plurality of circular bars 94 provided concentrically at a predetermined pitch from the center portion to the outermost peripheral portion, and the circular bars 94 intersect with the circular bars 94 are formed. It comprises a plurality of radial bars 95 provided radially from the center to the outermost periphery.

The distance between the adjacent radial bars 95 gradually increases from the center of the circular bar 94 to the outermost portion (shorterly decreases from the outermost portion to the center of the circular bar 94). Needless to say, the radial bar 5 has a predetermined portion where the end facing the center of the circular bar 94 is cut off.

Next, the missing configuration at the end of the radial bar 95 will be described in detail. At the outermost peripheral portion P s of the circular bar 94 that forms a perfect circle, the distance between the ends of the adjacent radial bars 5 is m. When the radial bar 95 is extended toward the center Z with the outermost peripheral portion Ps of the circular bar 94 as a base point, the interval between the adjacent radial bars 95 gradually becomes smaller than m. Go.

Finally, at the predetermined location of the circular bar 94, There is a position where the distance between the radial bars 95 is mZ2. At this position, the end of one of the radial bars 95 is cut off, and the portion beyond this is thinned out.

The other radial beam 95 extends as it is toward the center of the circular beam 94. As a result, the radial beam 95 is extended adjacent to the radial beam 95 that is not cut off first, and the distance between the radial beams is gradually reduced. 5 The distance between them becomes mZ 2, where one of the ends of the radial bar 95 is missing and the point is thinned out. Until the remaining radial bar 95 extends to the center of the circular bar 94, the chipping is repeated under the above conditions.

Further, a specific description will be given based on FIG. 11B. A reference radial bar S is provided vertically and horizontally orthogonally from the center of the circular bar 94 to the outermost periphery, and the radial bar at the intermediate portion (ie, 45 °) between the reference radial bars 95 s is provided. The pier is called 95a.

Radial bars 95b, 95b are provided on both sides of the radial bar 95a, and the complete circular shape of the circular bar 94 on which the radial bars 95c, 95c are arranged is also provided. The distance between the radial bars 95a, 95b, and 95c at the outermost peripheral portion Ps is m.

These radial bars 95 a, 95 b, 95 c extend from the outermost periphery of the circular bar 94 toward the center, but at the predetermined pitch circle position P a of the circular bar 94. The mutual interval between the radial bars 95a and the radial bars 95b and the mutual interval between the radial bars 95b and the radial bars 95c are respectively mZ2.

In this position, radial bar 95a and radial bar 95c remain intact. The ends of the radial bars 95b on both sides are cut off and the ends are thinned out. Radial bars 95a and 95c are further extended, so that radial bars 95a and 95c are adjacent to each other and the distance between them is gradually reduced. You. At a predetermined pitch circle position Pb of the circular beam 94, the mutual interval between the radial beams 95a and the radial beams 95c and the mutual interval between the radial beams 95c and the radial beams 95s are respectively m Z 2. Therefore, this time, the end of the radial bar 95 c is cut off, and the radial bar 95 a and the radial bar 95 s are further extended.

Therefore, after this, the radial bar 95 a and the reference radial bar 95 s are adjacent to each other, and the interval between them is gradually reduced. At a predetermined pitch circle position P c of the circular beam 94, the distance between the radial beams 95 a and 95 s is m Z 2. In here formed missing ends of radial bars 9 5 a, the previously central portion of the existing only reference radial rail 9 5 _S.

In this manner, the radial blower 95, which matches the strength of the outlet flow of the propeller fan 15f and is unnecessary in terms of strength, is cut off and thinned out. The fan-shaped configuration corresponding to the blow-out characteristics of the fan fan 90 reduces the ventilation resistance of the fan-guard 90 and significantly improves the air-blowing characteristics of the outdoor blower 15 to improve the heat exchange performance. Can be connected to

The number of radial bars 95 described in the column of Fangard 90 in Table 1 is as follows. In other words, the number of radial bars 25 at the outermost part a must be 32 as in the conventional example, but the ends of the radial bars are missing on a predetermined pitch circle. Therefore, half of the number is 16 in the middle part, and half of the number is half in the vicinity of the center. Therefore, the number of radial bars can be significantly reduced as compared with the conventional example.

FIG. 12 shows a fangard 99 as a modification of the above-described first embodiment. In this case, two sets of the fangade 90 described above with reference to FIG. 11A are provided at the same time, and the upper and lower sides are oriented so as to be symmetrical.

The internal configuration, not shown, is basically the same as that described above with reference to Fig. 1, but since it is adopted as an outdoor unit in a relatively large air conditioner, Two sets of outdoor heat exchangers are arranged to face the upper and lower fanguards, respectively, or a large outdoor heat exchanger spanning the upper and lower fanguards is installed. In addition, since the outdoor blower is disposed to face each of the upper and lower fan guards, the same operation and effect as described above can be obtained.

Industrial applicability

As described above, according to the present invention, while increasing the strength of the fan guard attached to the outlet of the housing, the ventilation area at the outlet is increased, and the ventilation resistance is reduced. This is effective in the technical field of air conditioners, as it has the effect of obtaining a significant improvement in performance.

Claims

The scope of the claims

1. In an air conditioner in which a heat exchanger and a blower that blows heat exchange air to the heat exchanger to perform heat exchange are provided in the housing, and are provided in the housing and blown to the heat exchanger. Outlet for guiding the heat exchange air after heat exchange to the outside, and

This fan is equipped with a fan guard that is attached to this outlet and that prevents the intrusion of objects into the interior by securing a ventilation area for heat exchange air.

The fangard is provided with a plurality of circular bars provided concentrically at a predetermined pitch, and radially provided from the central portion of the circular bar to the outermost peripheral portion so as to intersect with the circular bars. And a plurality of radial bars

The radial beams are provided alternately at concentric pitches on concentric circles between the circular beams.

2. The air conditioner according to claim 1,

The radial bar has an end facing the center of the circular bar missing at a predetermined position.

3. The air conditioner according to claim 1,

The fangard is integrally formed using a synthetic resin material.

4. The air conditioner according to claim 1,

The cross section of the circular crosspiece is substantially flat or substantially wing-shaped.

5. The air conditioner according to claim 1,

The radial cross section has a substantially circular or substantially flat cross section. The shape is almost wing-like.

6. In an air conditioner in which a heat exchanger and a blower that blows heat exchange air to the heat exchanger to exchange heat are provided in the housing, the heat exchanger is provided in the housing, and is blown to the heat exchanger. Outlet for guiding the heat exchange air after heat exchange to the outside,

A fangage attached to this outlet to prevent the intrusion of objects into the interior by ensuring a ventilation area for heat exchange air,

The fangand includes a plurality of circular bars provided concentrically at a predetermined pitch, and radially extending from the central portion of the circular bar to the outermost peripheral portion while intersecting with the circular bars. It is composed of a plurality of radial beams provided

The radial bars are arranged at equal intervals on the concentric circles between the circular bars, and the number of the radial bars is set to one of the concentric circles from the outermost periphery of the circular bar to the center. The pitch was reduced by one for each pitch.

7. The air conditioner according to claim 6,

The radial bar is formed as a reference radial bar formed linearly from the center of the circular bar to the outermost peripheral portion, and is formed in a parabolic shape on both sides of the linear portion. It is composed of a parabolic portion and staggered portions formed on both sides of the parabolic portion alternately on adjacent concentric circles between the circular bars.

8. The air conditioner according to claim 7,

A part of the staggered portions is arranged such that the intervals between the radial bars on the concentric circles of the circular bars are widened.

9. The air conditioner according to claim 6, wherein

The fangard is integrally formed using a synthetic resin material.

10. The air conditioner according to claim 6,

11. The air conditioner according to claim 6,

The cross section of the radial beam is substantially circular, substantially flat, or substantially wing-shaped.