JP2006317040A - Outdoor machine for air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase compression load strength near a servicing opening portion of a main body casing front plate of an outdoor machine for an air conditioner. <P>SOLUTION: In this outdoor machine for the air conditioner comprising the servicing opening portion on the front plate of the box-shaped main body casing storing at least a heat exchanger, a blower and a compressor, a reinforcement rib for improving compression load strength of the front plate near the servicing opening portion, is mounted near the servicing opening portion of the front plate. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a structure of a casing of an outdoor unit for an air conditioner.

  Generally, an outdoor unit for an air conditioner is divided into a machine room A and a fan room B through a partition plate 2 in a box-shaped main body casing 1 as shown in FIGS. 15 and 16, for example, and a compressor is placed on the machine room A side. 3 and the receiver 4 and the like, and a heat exchanger 5 and a blower 6 are respectively arranged on the fan chamber B side.

  An air suction port 7 is provided on the front and side surfaces of the fan casing B side of the main body casing 1 and an air outlet 8 is provided on the back side, while a corner portion extending from the front surface to the side surface on the lower side of the machine chamber A side. The service opening 9 is provided with an opening / closing cover 9a (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2003-106565 (Specifications page 1-5, FIG. 1-8)

  By the way, the outdoor unit for air conditioners as described above is temporarily stored in a stacked state in a plurality of warehouses before shipment. In particular, trunk-type large-scale outdoor units cannot use wooden frames, so the lower-stage outdoor unit depends on the impact load during stacking (generally at least three stages are stacked) and the weight of the upper-stage outdoor unit. The front plate 11F of the main casing 1 loses stability in the vicinity of the service opening 9 (see the portion X in FIG. 15) and may cause unstable buckling deformation.

  As shown in the figure, the front plate 11F is generally independent of the rear plate 11R and the frame plate on the air inlets 7 and 7 side, and the side portion of the service opening 9 has a flat thin plate structure with a narrow width. And rigidity against compression load from above (stability against compression deformation) is low. Therefore, it is estimated that buckling deformation is likely to occur.

  In this regard, in order to increase the strength (dent strength) of the rounded surface portion of the partition plate 2 in the main body casing 1, a plurality of reinforcing ribs are provided in parallel to the horizontal direction. Although it is also performed in Patent Document 1) (see, for example, reference numeral 28F in FIG. 6), it is not possible to find one that increases the compression load strength of the main body casing front plate 11F itself as described above.

  In order to solve the above problems and improve the buckling strength when stacking outdoor units, the compression rigidity in the vertical direction in the vicinity of the service opening 9 of the main body casing front plate 11F (stability during deformation) Need to be improved).

  Therefore, in the present invention, by disposing a reinforcing rib for increasing the compressive load strength in the vertical direction in the vicinity of the service opening of the main body casing front plate, the deformation stability of the front plate against the compressive load is improved. An object of the present invention is to provide an outdoor unit for an air conditioner.

  The present invention has been made for the purpose of solving the above problems, and comprises the following effective problem solving means.

(1) First Problem Solving Means The first problem solving means of the present invention is for service on the front plate 11F of a box-shaped main body casing 1 containing at least a heat exchanger 5, a blower 6, and a compressor 3. An outdoor unit for an air conditioner provided with an opening 9, which is provided in the vicinity of the service opening 9 of the front plate 11 </ b> F to improve the compressive load strength of the front plate 11 </ b> F in the vicinity of the service opening 9. The ribs 10, 10a, and 10b are provided.

  According to such a configuration, the reinforcing ribs 10, 10a, 10b increase the compressive load strength of the front plate 11F in the vicinity of the service opening 9, so that deformation due to the compressive load is less likely to occur during stacking.

(2) Second Problem Solving Means According to a second problem solving means of the present invention, in the configuration of the first problem solving means, the reinforcing ribs 10, 10a, 10b are in the vicinity of the opening 9 for service. It is characterized by being provided extending in the vertical direction.

  The vertically long reinforcing ribs extending in the vertical direction increase the bending rigidity of the thin plate and exhibit an effective counter force against a compressive load acting downward from above. Therefore, according to this configuration, the stability in the vicinity of the service opening 9 that was low in stability at the time of deformation is effectively improved, and the compressive load strength is increased.

(3) Third Problem Solving Means According to a third problem solving means of the present invention, in the configuration of the second problem solving means, the reinforcing ribs 10, 10a, 10b It is characterized by being provided with a length C corresponding to the length H.

  According to such a configuration, the portion where the buckling stress is concentrated moves to a portion having a wider plate width than the vicinity of the service opening 9 of the front plate 11F, and the stability in the vicinity of the service opening having low deformation stability. The properties are improved more effectively, and the compressive load strength is further increased.

  That is, the reinforcing rib extending in the vertical direction has a higher reinforcing effect when its vertical length C is long and at least equal to the height H of the opening 9 or extends higher than the height H. Therefore, it is preferable that the reinforcing ribs 10, 10 a, 10 b have a length C corresponding to the height H in the vertical direction of the service opening 9.

(4) Fourth Problem Solving Means According to a fourth problem solving means of the present invention, in the configuration of the first problem solving means, the reinforcing ribs 10, 10a, 10b are located upward from the side of the service opening 9. It is characterized by being provided along the opening shape of the opening part 9 for the service.

  According to such a configuration, the entire peripheral edge portion above the side of the service opening 9 is effectively reinforced, and the stability in the vicinity of the service opening 9 having low stability is further effectively improved. Compressive load strength increases.

(5) Fifth Problem Solving Means According to a fifth problem solving means of the present invention, in the configuration of the first, second, third or fourth problem solving means, a plurality of reinforcing ribs 10a and 10b are arranged in parallel. It is characterized by being installed.

  According to such a configuration, the rigidity-increasing action of the reinforcing ribs 10a and 10b is synergistically improved, and the stability in the vicinity of the service opening 9 having low stability is further improved, and the compressive load strength at the time of stacking is increased. , Get higher enough.

(6) Sixth Problem Solving Means The sixth problem solving means of the present invention is the reinforcing rib 10, 10a, 10b in the first, second, third, fourth or fifth problem solving means. Is characterized by being formed by press-molding a part of the front plate 11F into a U-shaped cross section.

  According to such a configuration, it is possible to easily form the reinforcing ribs 10, 10a, and 10b that effectively improve the compressive load strength when the main body casing front plate 11F is processed. Therefore, the processing cost is also low.

  As a result, according to the present invention, the following beneficial effects can be obtained.

  (1) The buckling strength when stacking outdoor units can be greatly improved.

  (2) By greatly improving the buckling strength at the time of stacking, it becomes possible to increase the number of stacks and improve the utilization rate of the warehouse. In addition, the stability of the deformation of the main casing can be effectively maintained against differences in handling in the world, vibration loads during transportation, and other unexpected loads.

  (3) By improving the buckling strength at the time of stacking, the thickness of the main body casing front plate can be expected to be reduced from the current 0.7 mm to 0.6 mm. This also leads to cost reduction and material processing quality improvement due to material reduction.

  (4) Product packing materials can be reduced by improving the buckling strength.

(Best Embodiment 1)
FIGS. 1-6 has shown the structure of the whole outdoor unit for air conditioners which concerns on the best Embodiment 1 of this invention, and the principal part.

  First, FIG. 1 shows a configuration of a main body casing 1 of the outdoor unit. Also in this case, the basic structure of the main body casing 1 itself is the same as that of the above-described conventional example, and is formed in a box shape, and the air suction ports 7 and 7 are provided on the front side of the fan chamber. Further, an air outlet (not shown in the state of FIG. 1 is omitted) is provided on the back side.

On the other hand, the part forming the machine room on the side of the fan chamber (on the right side in the state of FIG. 1) is separated from the frame plate on the side of the air inlets 7 and 7 shown in FIG. The front plate 11F and the back plate 11R having substantially the same shape are formed to face each other in a U-shaped cross section, and the lower corner portion of the front plate 11F is further provided with a service opening as shown in the figure. 9 is provided in a state of being cut out in a bowl shape. Thus, the front plate 11F has a narrow lower P ₁ portion (plate width G ₂ : see FIG. 4) and a wide upper P ₂ portion (plate width G, as specifically shown in FIG. 2, for example. ₁ : Refer to FIG. 4).

As a result, the intact, the front plate 11F is left hand side lower P ₁ portion of the service opening 9 has become particularly narrow flat sheet structure width, rigidity against compression load from above ( Deformation stability) is low, and the lower part P of the front plate 11F of the main body casing 1 of the lower outdoor unit due to the impact load during stacking and the weight of the upper outdoor unit itself (over 90 kg in the case of the trunk type) _One portion loses stability in the vicinity of the service opening 9 (see the X portion in FIG. 15), and may cause unstable buckling deformation.

Therefore, in the present embodiment, as shown in FIG. 3, for example, the compression load strength (bending rigidity) in the vertical direction is applied to the left side portion of the service opening 9 in the lower part P ₁ of the front plate 11F of the main body casing 1. A reinforcing rib 10 having a U-shaped cross section with a width A, a depth B, and a length C for increasing the height is arranged so as to protrude from the back side of the front plate 11F toward the front side, thereby allowing the upper side of the front plate 11F to be The stability against compressive load at the time of stacking acting from the side toward the lower side is improved.

  Then, for example, as shown in detail in FIG. 4, the reinforcing rib 10 is on the left side of the service opening 9 and is separated from the left side of the service opening 9 by a predetermined dimension (distance) D, And it has the length C corresponding to the height H of the up-down direction of the opening part 9 for the service, and is provided to extend straight in the up-down direction.

  Here, the said reinforcing rib 10 has the length C of the up-down direction corresponding to the height H of the service opening part 9 of the said front plate 11F that the lower end of the service opening part 9 is on the lower end side. The upper end side is at least substantially the same position as the upper end of the service opening 9 or preferably higher than the upper end of the service opening 9 by a predetermined dimension E. It means that it is formed in the length C in the vertical direction.

According to such a configuration, the portion where the compressive stress is concentrated moves to the P ₂ portion having a wider plate width on the upper side, and in the vicinity of the service opening 9 in the lower portion P ₁ of the main body casing front plate 11F, which has been low in stability. Stability against buckling deformation is effectively improved, and the compressive load strength is sufficiently increased. As a result, even when a plurality of units are stacked, deformation due to the compressive load is less likely to occur.

  As described above, the length C of the reinforcing rib 10 in the vertical direction is sufficient if the upper end of the reinforcing rib 10 is formed to have a length that is higher than the upper end of the service opening 9 by a predetermined dimension E. However, the dimension E that becomes the same can be increased to a dimension level as shown in FIG. 5 that is larger than the dimension level shown in FIG. 4, for example, by a predetermined dimension.

With such a configuration, it is possible to further increase the compressive load strength by sufficiently reinforcing the X portion of FIG. 15 where buckling has conventionally occurred, and the lower portion P of the main body casing front plate 11F with a narrow width. it is possible to achieve a rigidity in a wide range ranging from ₁ part to wide upper P ₂ width portion.

  In the above configuration, the reinforcing rib 10 is formed by press-molding a part of the main body casing front plate 11F into a U-shaped cross section.

  According to such a configuration, the reinforcing rib 10 that effectively improves the compressive load strength as described above can be easily formed at the time of processing the front plate 11F of the main body casing 1, and the cost is low.

  As a result, according to the present embodiment, the following beneficial effects can be obtained.

  (1) The buckling strength when stacking outdoor units can be greatly improved.

  (2) By greatly improving the buckling strength at the time of stacking, it becomes possible to increase the number of stacks and improve the utilization rate of the warehouse. In addition, the stability of the deformation of the main casing can be effectively maintained against differences in handling in the world, vibration loads during transportation, and other unexpected loads.

  (3) By improving the buckling strength at the time of stacking, the thickness of the main body casing front plate can be expected to be reduced from the current 0.7 mm to 0.6 mm. This also leads to cost reduction and material processing quality improvement due to material reduction.

  (4) Product packing materials can be reduced by improving the buckling strength.

(Best Mode 2)
Next, FIGS. 7 and 8 show the configuration of the main part (front plate) of the outdoor unit for an air conditioner according to Embodiment 2 of the present invention.

  In this embodiment, when the reinforcing rib 10 is provided as in the first embodiment, the reinforcing rib 10 is provided on the service opening 9 side as shown in FIG. It is characterized in that it is provided so as to be bent in a bowl shape along the bowl-shaped opening shape of the service opening 9.

  According to such a configuration, the stability in the vicinity of the service opening 9 of the main casing front plate 11F, which has low bending rigidity and low stability against deformation, is further effectively improved, and the compressive load strength is further increased.

  FIG. 7 shows, for example, that the upper end side of the reinforcing rib 10 of the first embodiment shown in FIGS. 1 to 4 is not elongated straight upward as shown in FIG. FIG. 8 shows a case in which the upper end side is further extended horizontally in the right direction so that substantially the whole of the service opening 9 is formed. Reinforced in shape.

  In the case of FIG. 7, a reinforcing effect substantially similar to that of the above-described first embodiment is assumed, and in the case of FIG. 8, the reinforcing effect is higher than that of FIG. Is expected to be.

(Verification of reinforcement effect)
The vertically long reinforcing rib 10 (FIGS. 1 to 6) according to the basic configuration of the best embodiment 1 that is straight in the vertical direction, and the best embodiment 2 in which the configuration of the best embodiment 1 is modified. In connection with the reinforcing rib 10 (FIGS. 7 and 8) according to the first embodiment, as shown in FIG. 9, for example, a first reinforcing rib 10 having an arc shape is provided only in the bowl-shaped corner portion of the service opening 9. For example, as shown in FIG. 10, only the upper end side of the arc-shaped reinforcing rib 10 of FIG. 9 is extended to the right so as to cover the entire upper end portion of the service opening 9. Three types of the second sample, and for example, a third sample provided with a horizontally long reinforcing rib 10 in the left-right direction so as to cover only the upper end side of the service opening 9 as shown in FIG. The front plate is manufactured, and these first to third , Including a comparison with the configuration of the sample was verified reinforcing effect of the reinforcing ribs 10 of the structure of Embodiments 1 and 2 above best embodiment from the standpoint of quality engineering.

(Influence of dimensions and position of reinforcing rib 10 on buckling strength)
First, an analysis was performed in the case where one vertically long reinforcing rib 10 corresponding to the above-described configuration of the first preferred embodiment (FIGS. 1 to 4) was disposed.

  In this case, the dimensions (width A, depth B, length C shown in FIGS. 3 and 4) and the installation position (distance D from the service opening 9 shown in FIG. 4) of the reinforcing rib 10 are designed variables ( Table 1 below shows the level values (three level values 1 to 3) in the case of the evaluation parameter. Then, the level values 1, 2, and 3 of the design variables A to D are assigned to the L9 orthogonal experiment table of Table 2, and the combination patterns No1 to No9 (9 types) of the level values are created, and these No1 to No9 are analyzed. The following analysis was performed as a sample, and the buckling load (kgf) at the time of stacking each outdoor unit was determined. The calculation result of the buckling load is shown in the right column of Table 2.

  Further, Table 3 is an analysis of variance table for the calculation results of Table 2, and Table 4 is an analysis of variance table in which residuals are collected.

  On the other hand, FIG. 12 is a factor effect diagram of the design variables A to D. The design variables A (width), B (depth), C (length), D (service opening 9) of the reinforcing rib 10 are shown. This shows the reinforcement effect at each level of the distance from the distance. In this figure, a variable having a large slope between levels has a high contribution, and a large SN ratio has a large reinforcing effect.

  Table 5 below shows the design variables (evaluation parameters) of the width A, depth B, length C and installation position (distance D from the service opening 9 shown in FIG. 4) shown in FIGS. The SN ratio for each level value (1 to 3) is shown.

  From the factor-effect diagram of FIG. 12, the predicted value of the SN ratio under the optimum condition when combining the level value that maximizes the SN ratio in each variable is 57.5051 dB, which is 749.9 kgf when converted to the buckling load value. The calculation result (analysis result) using an optimum combination of level values is almost equal to 741.3 kgf. This indicates that the results obtained from the experimental design using the direct table are correct and reliable.

  Table 6 shows a comparison between the analysis result and the predicted value.

  These results reveal the following.

  (1) If the vertically long strong ribs 10 extending straight in the vertical direction are arranged, the buckling strength at the time of stacking is greatly improved.

  (2) And the effect of the reinforcement rib 10 with respect to the buckling strength improvement at the time of this stacking has the highest contribution ratio of the depth B. The next highest contribution is the length C of the reinforcing rib 10.

  On the other hand, both the width A of the reinforcing rib 10 and the distance D from the service opening 9 have a low contribution rate.

  However, if the depth B of the reinforcing rib 10 is made too deep, there is a problem in molding and appearance. Therefore, the depth B of the reinforcing rib 10 is preferably 1.0 mm to 3.0 mm. Similarly, considering the problem of molding and appearance, the width W of the reinforcing rib 10 is suitably 4.0 mm to 6.0 mm.

  (3) As described above, the length C of the reinforcing rib 10 has a higher contribution rate to the buckling strength improvement, and the longer the length C of the reinforcing rib 10 is, the higher the buckling strength at the time of stacking is.

  Considering these results, the reinforcing rib 10 having the length C corresponding to the height H of the service opening 9 and having the configuration shown in FIGS. In the structure of FIG. 5 in which the length C is longer than that of FIGS. 1 to 4, the buckling strength is further improved. In the case of the configuration in FIG. 6 in which two reinforcing ribs 10 similar to those in FIG. 5 are arranged side by side, it is easily estimated that the reinforcing effect is further improved.

  Here, regarding the vertically long reinforcing rib 10 of FIGS. 1 to 5 described above, the case where there is only one (A), the case where it is 10a and 10b as shown in FIG. 6 (B), and FIG. In the case where there are no vertical portions and only horizontal horizontal ribs (c) are used, the seats when the length C of the rib 10 portion is set to 100 mm, 142 mm, 184 mm, 226 mm, and 268 mm, respectively. When the bending load (kgf) was calculated and compared with the case where the rib 10 was not provided at all (length C = 0.0 mm), it was as shown in Table 7 below.

  In addition, (b) for two types of reinforcing ribs (Fig. 1 to Fig. 5) and (c) horizontal rib (Fig. 11), the change in buckling load due to the difference in rib length C was measured. When it sees, it became like the graph of FIG.

  From these results, it is clear that the reinforcing rib 10 is more effective when it is provided straight in the vertical direction as shown in FIGS. 1 to 5 and 6, and two are more effective than one. It turns out that it is.

  Moreover, the longer length C is more effective, and it is preferable that the length C is sufficiently higher than the upper end of the service opening 9 as shown in FIG.

Furthermore, even in the case of the horizontally long horizontal rib (c) of FIG. 11 having no rib portion in the vertical direction, if the length C is equal to or larger than the predetermined dimension, it contributes to the increase in load strength to a slight extent. I understand. This action is substantially the same also in the case of the relationship between the reinforcing rib 10 in FIG. 9 and the reinforcing rib 10 in FIG. 10 (described later). In the case of the horizontal reinforcing ribs 10 in FIG. 11, the more effectively reinforcing effect length of the portion according to the lower P ₁ portion of the front plate 11F its length C is longer in the left direction is longer increases.

  In consideration of these, the reinforcing rib 10 of FIG. 7 in the form of a combination of the longitudinal reinforcing rib 10 of FIGS. 1 to 5 and the arc-shaped reinforcing rib 10 of FIG. The reinforcing rib 10 in FIG. 8, which is a combination of the reinforcing rib 10 and the arc-shaped reinforcing rib 10 which is also long in the lateral direction in FIG. 10, has an effect of increasing the load strength and the opening edge portion reinforcing action by the rib portions in both the vertical and horizontal directions. Synergistically, it is predicted that the load strength is more effectively increased.

  Therefore, the reinforcing rib (d) in FIG. 7 and the reinforcing rib (e) in FIG. 8 and the arc-shaped reinforcing rib (f) in FIG. Reinforcing ribs (g), each buckling load (kgf) is calculated, and compared with the buckling load (524.2 kgf) of the front plate 11F (see the conventional example in FIG. 15) when there is no reinforcing rib 10, The result is as shown in Table 8 below.

  Looking at this result, it is not very effective to place only the arc-shaped (about ¼) reinforcing rib 10c in the vicinity of the corner portion, but the length is increased and the entire upper end side of the service opening 9 is made. If placed in the position, it contributes to increasing the load strength. On the other hand, when the vertically long ribs and the reinforcing arcs of the quarter arc shape and the horizontally long arc shape are continuously arranged, the effect of increasing the load strength is remarkable.

Incidentally, the distance D from the service opening 9 of the vertically long reinforcing rib 10, 10a, 10b of FIGS. 1 to 6 and the vertically long portion of the reinforcing rib 10 of FIGS. 7 and 8 is the lower part P _{1 of the} front plate 11F. The ratio D is set to an appropriate dimension D that increases the buckling load strength to a predetermined level or more in a ratio relationship with the width G _{2 of the} portion.

According to the calculation result, it is sufficient that the same dimension D is within a range of 40% to 5% of the width G ₂ of the lower portion P ₁ of the front plate 11F, as shown in FIG.

When the width G ₂ of the lower portion P ₁ of the front plate 11F is narrower than the width W of the service opening 9, the width G ₂ of the lower portion P ₁ of the front plate 11F is equal to the width W of the service opening 9. The range of the distance D where the reinforcing effect is remarkable is narrower than the case where it is wider than the above (the reinforcing effect starts to decrease significantly at the close distance D).

  When the effect of the reinforcing rib is small, there is a buckling position on the service opening 9 side as in the case without the rib, but when there is a remarkable effect as described above, the buckling position is the position of the reinforcing rib 10. Move up.

(Summary of examination results)
From the various examination results described above, the following can be understood.

  (1) Regarding the configuration of the reinforcing ribs 10, 10a, 10b, the effect in the case of only the horizontal ribs in the horizontal direction is considerably limited as compared with the case of having the vertical rib portions. validate.

  (2) When the length of the vertical rib portion is at least about the same height as the height H of the opening 9 for service, compared with the case without it, Buckling strength is greatly improved. Therefore, it is desirable to install the length of the vertical rib portion longer than the height H of the service opening 9.

  (3) When the horizontal rib length is the same as the width W of the service opening 9, the buckling strength during stacking is almost the same as the case without ribs, and the effect of the reinforcing rib is almost seen. However, if the length of the rib in the horizontal direction is longer than the width W of the service opening 9, the reinforcing effect as a reinforcing rib can be improved. Therefore, the length of the horizontal rib is preferably larger than the width W of the service opening 9.

  (4) Even if only the arc-shaped reinforcing ribs are arranged, there is not much effect, but the effect becomes remarkable when arranged in combination with the vertical ribs.

  (5) Under the above-mentioned conditions, when a plurality of longitudinal ribs are arranged, the buckling strength during stacking is greatly improved.

It is a perspective view which shows the whole structure of the outdoor unit for air conditioners which concerns on the best Embodiment 1 of this invention. It is a perspective view which shows the structure of the front-surface board part of the main body casing of the outdoor unit. It is sectional drawing (II of FIG. 2) of the principal part of the front plate. It is the elements on larger scale of the principal part of the front plate. It is a front view of the example of reinforcement rib length extension of the front plate. It is a front view of the example of installation of multiple reinforcing ribs of the front plate. It is a front view which shows the structure of the front-plate part of the main body casing of the outdoor unit for air conditioners concerning the best embodiment 2 of this invention. It is a front view of the reinforcement rib modification of the front plate. It is a front view of the 1st sample (1st examination example) of the front plate. It is a front view of the 2nd sample (2nd examination example) of the front plate. It is a front view of the 3rd sample (the 3rd examination example) of the front plate. Factors for analyzing the reinforcing effect of the reinforcing ribs of the front plate of the main body casing of the outdoor unit for an air conditioner according to the first and second embodiments of the present invention by design variables such as width, depth, length, and distance It is an effect figure. It is a graph which shows the relationship between the length of the reinforcement rib of the front plate, and the buckling load at the time of stacking. It is a graph which shows the relationship between the reinforcement rib installation position in the lower part which has the service opening part of the front plate, and the buckling load at the time of stacking. It is a perspective view which shows the whole structure of the conventional outdoor unit for air conditioners. It is sectional drawing which shows the internal structure of the outdoor unit main body.

Explanation of symbols

  1 is a main body casing of an outdoor unit, 2 is a partition plate, 3 is a compressor, 4 is a receiver, 5 is a heat exchanger, 6 is a blower fan, 7 is an air inlet, 8 is an air outlet, and 9 is a service opening. And 10 are reinforcing ribs, 11F is a front plate, and 11E is a back plate.

Claims (6)

  An air conditioner comprising a service opening (9) on a front plate (11F) of a box-shaped main casing 1 containing at least a heat exchanger (5), a blower (6), and a compressor (3). Reinforcing ribs for improving the compressive load strength of the front plate (11F) in the vicinity of the service opening (9) in the vicinity of the service opening (9) of the front plate (11F). 10), (10a), (10b) is provided, The outdoor unit for air conditioners characterized by the above-mentioned.   The air conditioner according to claim 1, wherein the reinforcing ribs (10), (10a), (10b) are provided in the vicinity of the service opening (9) and extend in the vertical direction. Outdoor unit.   Reinforcing ribs (10), (10a), (10b) are provided with a length C corresponding to the vertical height H of the service opening (9). 2. An outdoor unit for an air conditioner according to 2.   The reinforcing ribs (10), (10a), (10b) are provided from the side of the service opening (9) to the upper side and along the opening shape of the service opening (9). The outdoor unit for an air conditioner according to claim 1, 2, or 3.   The outdoor unit for an air conditioner according to claim 1, 2, 3, or 4, wherein a plurality of reinforcing ribs (10a, 10b) are arranged side by side. Reinforcing ribs (10), (10a), (10b) are formed by pressing a part of a front plate (11F) into a U-shaped cross section. Or the outdoor unit for air conditioners of 5.

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