WO2006121107A1

WO2006121107A1 - Outdoor unit for air conditioner

Info

Publication number: WO2006121107A1
Application number: PCT/JP2006/309465
Authority: WO
Inventors: Jihong Liu; Mikayo Yamanaka
Original assignee: Daikin Industries, Ltd.
Priority date: 2005-05-11
Filing date: 2006-05-11
Publication date: 2006-11-16
Also published as: JP4696673B2; CN101128703B; US20080141710A1; EP1881275B1; EP1881275A4; JP2006317040A; CN101128703A; EP1881275A1

Abstract

An outdoor unit for an air conditioner, having a box-shaped casing for receiving at least a heat exchanger, a fan, and a compressor, the casing having an opening formed in its front wall. In the vicinity of the opening of the front wall is provided a reinforcement rib for increasing compression strength near the opening.

Description

Specification

Air conditioner outdoor unit

Technical field

[0001] The present invention relates to a casing structure of an outdoor unit for an air conditioner.

Background art

[0002] In general, an air conditioner includes an indoor unit arranged inside a house and an outdoor unit arranged outside the house. As shown in FIGS. 15 and 16, the outdoor unit includes a box-shaped casing 1, and a space in the casing 1 is partitioned into a machine room 1A and a fan room 1B via a partition plate 2. . A compressor 3 and a resino are arranged in the machine room 1A, and a heat exchanger 5 and a blower 6 are arranged in the fan room 1B.

An air suction port 7 is provided on the front surface and side surface of the casing 1. An air outlet 8 is provided on the back of the casing 1. An opening 9 for inspection is provided at the lower end of the casing 1, and a cover 9a is attached so as to cover the opening 9 (see, for example, Patent Document 1).

Patent Document 1: Japanese Patent Laid-Open No. 2003-106565

Disclosure of the invention

[0004] Outdoor units are stored in a warehouse or the like in a stacked state before shipment. Therefore, the load tends to concentrate near the opening 9 (part X shown in Fig. 15) of the front wall 11F due to impact during stacking work or the weight of the outdoor unit. Therefore, when the outdoor units are stacked, buckling deformation may occur near the opening 9 of the front wall 11F.

[0005] The front wall 11F is a separate body from the frame body 11R constituting the back surface of the casing 1 and the frame plate 11Y disposed around the air suction port 7. The front wall 11F has an L-shaped cross section, and the vicinity of the opening 9 is partially narrowed. For this reason, the rigidity in the vicinity of the opening 9 is partially low in the front wall 11F. Therefore, buckling deformation tends to occur near the opening 9 of the front wall 11F due to the compressive load applied during stacking. For the above reasons, it is required to increase the compression rigidity in the vicinity of the opening 9 of the front wall 11F in order to prevent buckling deformation even when the outdoor units are stacked. [0006] However, Patent Document 1 discloses only a configuration for increasing the strength of the curved portion of the partition plate, and discloses any configuration for increasing the strength of the front wall of the casing. It has not been.

[0007] An object of the present invention is to provide an outdoor unit for an air conditioner that can increase the compression rigidity in the vicinity of the opening portion of the front wall by a reinforcing rib and suppress buckling deformation due to a compression load as much as possible. It is in.

[0008] In order to solve the above problems, according to a first aspect of the present invention, a box-shaped casing that houses at least a heat exchanger, a blower, and a compressor is provided, and an opening is formed in a front wall of the casing. An air conditioner outdoor unit provided with a reinforcing rib for improving the compressive strength in the vicinity of the opening is provided in the vicinity of the opening on the front wall.

[0009] With the above configuration, the compression ribs near the opening of the front wall are increased by the reinforcing ribs. Therefore, when outdoor units are stacked, deformation due to compressive load is less likely to occur near the opening of the front wall.

[0010] In the outdoor unit for an air conditioner described above, it is preferable that the reinforcing rib extends in the vertical direction. In that case, the compression ribs increase the compression rigidity of the thin plate constituting the casing, so that deformation due to the compression load can be effectively suppressed.

[0011] In the outdoor unit for an air conditioner, the reinforcing rib extends upward from the side of the opening.

And it is preferable to be provided along the edge of the opening. In that case, the vicinity of the opening can be reinforced overall and effectively. Therefore, since the compression rigidity in the vicinity of the opening of the front wall is further increased, deformation due to the compressive load can be further suppressed.

[0012] In the outdoor unit for an air conditioner described above, it is preferable that the length of the reinforcing rib is set corresponding to the height of the opening. In that case, the concentrated portion of the buckling stress moves upward from the opening of the front wall by the reinforcing rib. As a result, the concentration of buckling stress near the opening of the front wall is avoided, so that deformation due to compressive load can be further suppressed.

[0013] The outdoor unit for an air conditioner described above preferably includes a plurality of reinforcing ribs, and the reinforcing ribs are arranged in parallel to each other. In that case, the reinforcing effect in the vicinity of the opening of the front wall is further enhanced by each reinforcing rib. Therefore, the compression stiffness near the opening of the front wall Therefore, the deformation due to the compressive load can be further suppressed.

[0014] In the above outdoor unit for an air conditioner, the reinforcing rib is preferably formed in a U-shaped cross section by press-molding a part of the front wall. In that case, when manufacturing the casing, the reinforcing rib can be easily formed simultaneously with the processing of the front wall, so that the product can be manufactured at low cost.

Brief Description of Drawings

FIG. 1 is a perspective view showing an overall configuration of an outdoor unit for an air conditioner according to a first embodiment.

FIG. 2 is a perspective view of a front wall constituting the casing.

FIG. 3 is a cross-sectional view taken along line 3—3 in FIG.

[4] Partial plan view showing the vicinity of the opening of the front wall.

[Figure 5] Front view of the front wall.

FIG. 6 is a front view of a front wall provided with a plurality of reinforcing ribs.

FIG. 7 is a front view of a front wall of an outdoor unit for an air conditioner according to a second embodiment.

FIG. 8 is a front view showing a modification of the reinforcing rib.

FIG. 9 is a front view showing a first sample of the front wall (first examination example).

FIG. 10 is a front view showing a second sample of the front wall (second examination example).

FIG. 11 is a front view showing a third sample of the front wall (third examination example).

FIG. 12 is a factor effect diagram for analyzing the reinforcing effect of the reinforcing ribs of the first and second embodiments.

FIG. 13 is a graph showing the relationship between rib length and buckling load.

FIG. 14 is a graph showing the relationship between rib position and buckling value.

FIG. 15 is a perspective view showing the overall configuration of a conventional outdoor unit for an air conditioner.

FIG. 16 is a cross-sectional view showing the internal configuration of the outdoor unit.

BEST MODE FOR CARRYING OUT THE INVENTION

[0016] (First embodiment)

Hereinafter, the outdoor unit for air conditioners of 1st Embodiment of this invention is demonstrated with reference to FIGS.

As shown in FIG. 1, the outdoor unit for an air conditioner includes a substantially rectangular parallelepiped casing 1. The A pair of air inlets 7 are provided on the front surface of the casing 1, and an air outlet (not shown) is provided on the rear surface. Each suction port 7 is arranged at the upper part and the lower part of the casing 1, respectively.

[0018] The front surface of the casing 1 includes a frame plate 11Y disposed around the air suction port 7, and a front wall 11F having an L-shaped cross section. A frame body 11R having a U-shaped cross section constituting the back surface of the casing 1 is attached to the rear portions of the frame plate 11Y and the front wall 11F. An opening 9 for inspection is provided at the lower end of the casing 1, and a cover 9 a is attached so as to cover the opening 9. The opening 9 is formed by cutting out the corners of the front wall 11F and the frame 11R. Therefore, as shown in FIG. 2, the front wall 11F is divided into a lower part P1 and an upper part P2 wider than the lower part P1. As shown in Fig. 4, the width of the lower P1 is G2, and the width of the upper P2 is G1.

[0019] Since the lower part P1 of the front wall 11F is narrow and flat, the strength against compressive load (compressive strength) is low. Therefore, buckling deformation occurs in the vicinity of the opening 9 in the lower part P1 of the front wall 11F, especially in the part X shown in Fig. 15, due to the impact during stacking and the weight of the outdoor unit (about 90kg for the trunk type). easy.

[0020] Therefore, in the present invention, the reinforcing rib 10 for improving the compressive strength is provided in the lower portion P1 of the front wall 11F. The reinforcing rib 10 extends linearly in the vertical direction and is provided along the side edge of the opening 9. As shown in FIGS. 3 and 4, the reinforcing rib 10 has a U-shaped cross section and protrudes forward of the front wall 11F. The reinforcing rib 10 increases the bending rigidity near the opening 9 of the front wall 11F. The width of the reinforcing rib 10 is A, the depth is B, and the length is C.

[0021] The reinforcing rib 10 is separated from the side edge of the opening 9 by a distance D to the side. The reinforcing rib 10 has a length C corresponding to the height H of the opening 9. The length C corresponding to the height H of the opening 9 is a position force that is a distance F above the lower end of the opening 9 by a distance F. The length to the upper end of the opening 9 is also the upper end force of the opening 9 by a distance E. It is a value obtained by adding the length to the position of. The length C corresponding to the height H of the opening 9 may be a length from a position above the lower end of the opening 9 by a distance F to the upper end of the opening 9.

[0022] Due to the reinforcing rib 10, the stress concentration point due to the compressive load is reduced to the lower part of the front wall 11F. Since it moves from PI to the upper part P2, stress concentration near the opening 9 near the front wall 11F is avoided. As a result, even if the outdoor units are stacked, buckling deformation due to the compressive load is less likely to occur near the opening 9 of the front wall 11F.

[0023] As shown in FIG. 5, when setting the length of the reinforcing rib 10, it is preferable to make the distance E from the upper end of the opening 9 to the upper end of the reinforcing rib 10 longer than in the case of FIG. . In this case, the compressive strength can be increased not only in the portion X (see FIG. 15) that is easily buckled and deformed, but also in a wider range near the opening 9 of the front wall 11F.

[0024] The reinforcing rib 10 is formed in a U-shaped cross section by press-molding a part of the front wall 11F of the casing 1. In this case, when the casing 1 is formed, the reinforcing rib 10 can be easily formed simultaneously with the processing of the front wall 11F.

[0025] According to the first embodiment, the following effects can be obtained.

(1) The compressive strength in the vicinity of the opening 9 of the front wall 11F is greatly improved.

[0027] (2) Since the compressive strength in the vicinity of the opening 9 of the front wall 11F is improved, the product can be stored with an increased number of stacks, and the use efficiency of the warehouse can be improved. In addition, buckling deformation due to a compressive load is less likely to occur near the opening 9 of the casing 1 during product transportation.

(3) Since the compressive strength in the vicinity of the opening 9 of the front wall 11F is improved, the thickness of the front wall 11F can be reduced from the current 0.7 mm to 0.6 mm. As a result, the amount of material used is reduced, so that the material cost can be reduced and the processing quality of the product can be improved.

[4] (4) Since the compressive strength in the vicinity of the opening 9 of the front wall 11F is improved, the amount of product packing material used can be reduced by IJ.

[0030] (Second Embodiment)

Hereinafter, an outdoor unit for an air conditioner according to a second embodiment of the present invention will be described with reference to FIG. 7 and FIG. The detailed description of the same parts in the second embodiment as those in the first embodiment is omitted.

As shown in FIGS. 7 and 8, the reinforcing rib 10 extends along the side edge of the opening 9, and the upper end extends along the corner of the opening 9. With this reinforcing rib 10, the front wall 11F The bending rigidity in the vicinity of the opening 9 is further increased.

In the reinforcing rib 10 shown in FIG. 7, unlike the first embodiment, the upper end of the reinforcing rib 10 is bent along the corner of the opening 9. In the reinforcing rib 10 in FIG. 8, the upper end of the bent reinforcing rib 10 is extended in the lateral direction along the upper side edge of the opening 9. The reinforcing rib 10 reinforces substantially the entire vicinity of the opening 9 of the front wall 11F.

In the case of FIG. 7, the same reinforcing effect as that in the first embodiment is assumed, and in the case of FIG. 8, it is assumed that the reinforcing effect is higher than that in FIG.

[0034] (Verification of reinforcement effect)

In connection with the reinforcing rib 10 of the first embodiment (see FIGS. 1 to 6) and the reinforcing rib 10 of the second embodiment (see FIGS. 7 and 8), as shown in FIG. A sample in which the rib 10 was arranged only at the corner of the opening 9 was used as the first sample. Further, as shown in FIG. 10, the second sample was obtained by extending the upper end of the reinforcing rib 10 of FIG. 9 in the horizontal direction and arranging it along the upper side edge of the opening 9. In addition, as shown in FIG. 11, the third sample was obtained by arranging only the reinforcing ribs 10 (lateral ribs) extending in the lateral direction along the upper side edge of the opening 9. Then, the reinforcing effect of the reinforcing rib 10 of the first and second embodiments was verified from the viewpoint of quality engineering, including comparison with the first to third samples.

[0035] (Effect of size and position of reinforcing rib 10 on compressive strength)

First, the reinforcing effect by the reinforcing rib 10 of the first embodiment was verified.

[0036] In the verification, each dimension of the reinforcing rib 10 (width A, depth B, length C in Figs. 3 and 4) and position (distance D in Fig. 4) are designated as design variables (evaluation parameters). As a result, three patterns (level values 1 to 3) were set for each design variable. Table 1 shows the design variables and each level. Next, the level values 1, 2, and 3 for each design variable A to D were assigned to the L9 orthogonal experiment table in Table 2. Then, for analysis No. 1 to No. 9 that combined each level value, the buckling load (kgf) when the outdoor units were stacked was determined. The results are shown in Table 2.

[0037] [Table 1] y dimension and level

Position (mm)

one two Three

A (Width) 4.0 5.0 6.0

B (depth) 1.0 1.5 2.0

C (Length) 100.0 142.0 184.0

D difficulty) 48.0 33.0 18.0

[0038] [Table 2]

Table 3 shows an analysis of variance table for the calculation results of Table 2. Table 4 is an analysis of variance table that gathers residuals.

[0040] [Table 3] Source S f V F0 S 'P (%)

A 0.2678 2 0.1339 0.2678 6.38

B 2.5585 2 1.2793 2.5585 60.92

C 1.1931 2 0.5966 1,1931 28.41

D 0.1805 2 0.0903 0.1805 4.30 e 0 0 0 One 0 0

T 4.1999 8 4.1999 10 meetings

[0041] [Table 4]

FIG. 12 is a factor effect diagram of each design variable A to D. In Fig. 12, the vertical axis is the SN ratio and the horizontal axis is the design variable (left force is also A (width), B (depth), C (length), D (distance)). The factor-effect diagram shows that the greater the SN ratio, the greater the reinforcement effect, and the greater the slope between the levels, the greater the contribution to the reinforcement effect. Table ₅ shows the signal-to-noise ratio corresponding to each level value of each design variable (:! ~ 3).

[0043] [Table 5] Design variable Level value

(Factor) Name 1 2 3

A (Width) 55.8956 55.8548 56.2394

B (depth) 55.3876 55.9510 56.6712

C (Length) 55.5146 56.0808 56.3945

. Difficult) 55.9454 55.8546 56.1899

[0044] From the factor-effect diagram in Fig. 12, under the optimum conditions that combine the level values of each design variable that maximizes the SN ratio, the predicted SN ratio is 57.5051 dB. 9. It became 9kgf. On the other hand, the calculated value (prayed value) of the buckling load when combined with the optimal level was 741.3 kgf, which was almost the same as the predicted SN ratio. From this result, it was verified that the results obtained using the orthogonal table were correct and reliable. Table 6 shows the predicted and analyzed values.

[0045] [Table 6]

[0046] From the above results, the following is found.

[0047] (1) A large reinforcing effect can be obtained by the reinforcing rib (vertical rib) extending in the vertical direction.

(2) The depth B of the reinforcing rib 10 contributes the most to the reinforcing effect, and then the length C of the reinforcing rib 10 contributes. On the other hand, both the width A and the separation distance D of the reinforcing rib 10 have a small contribution to the reinforcing strength. However, if the reinforcing ribs 10 are made too deep, the processing quality and appearance quality of the product may be deteriorated. For this reason, the depth B of the reinforcing rib 10 is preferably 1. Omm to 3. Omm. The width A of the reinforcing rib 10 is preferably 4.0 mm to 6. Omm.

[0049] (3) The length C of the reinforcing rib 10 also greatly contributes to the reinforcing effect. If it is, a big reinforcement effect can be acquired.

From these results, the reinforcing rib 10 shown in FIGS. 1 to 4 of the first embodiment is effective in improving the compressive strength, and the reinforcing rib 10 shown in FIG. 5 is effective in improving the compressive strength. It is also effective. Further, as shown in FIG. 6, it is easily estimated that a larger reinforcing effect can be obtained by providing two reinforcing ribs 10 in parallel.

[0051] Next, the reinforcing effect of one vertical rib was compared with the reinforcing effect of two vertical ribs. Here, the one with one vertical rib is designated as (S1) (see Figs. 1 to 5), and the one with two vertical ribs is designated as (S2) (see Fig. 6). (S3) is the one with only (see Fig. 11). Then, for the cases of (S1) to (S3), the buckling load (kgf) when the length C of each reinforcing rib 10 was Omm, 100 mm, 142 mm, 184 mm, 226 mm, and 268 mm was determined. The results are shown in Table 7.

[0052] [Table 7]

[0053] Further, in the cases of (S1) and (S3), the relationship between the rib length and the buckling load was determined. The results are shown in the graph of FIG.

From the graph of FIG. 13, it was confirmed that the reinforcing effect by the vertical ribs was higher than the reinforcing effect by the horizontal ribs. In addition, from the results in Table 7, it was confirmed that the reinforcing effect of the two vertical ribs was higher than the reinforcing effect of the single vertical rib. Furthermore, in the case of vertical ribs, it was confirmed that the reinforcing effect increases as the rib length increases. In addition, in the case of the lateral rib, it was confirmed that the reinforcing effect was enhanced to a small extent when the length of the rib exceeded a predetermined dimension.

[0055] The above action occurs in substantially the same manner between the reinforcing rib 10 in FIG. 9 and the reinforcing rib 10 in FIG.

In the case of the reinforcing rib 10 in FIG. 11, it was confirmed that the reinforcing effect increases as the length of the rib is increased and the portion corresponding to the lower portion P1 of the rib becomes longer.

[0056] Based on the above results, the combination of the reinforcing rib 10 of FIGS. 1 to 5 and the reinforcing rib 10 of FIG. According to the reinforcing rib 10 of Fig. 7 or the reinforcing rib 10 of Fig. 8 which is a combination of the reinforcing rib 10 of Figs. 1 to 5 and the reinforcing rib 10 of Fig. 10, both the longitudinal and lateral bending rigidity can be increased. Therefore, the compressive strength can be improved more effectively.

Next, the reinforcing rib 10 of FIG. 7 shown in the second embodiment is (S4), the reinforcing rib 10 of FIG. 8 is (S5), the reinforcing rib 10 of FIG. 9 is (S6), and FIG. The buckling load (kgf) in the case of (S4) to (S7) was determined for each reinforcing rib 10 of (S7). The results are shown in Table 8 together with the case without ribs.

[0058] [Table 8]

[0059] From the results in Table 8, in the case of (S4) and (S5), a large reinforcing effect was obtained. In the case of (S7), a little reinforcing effect was obtained. However, in the case of (S6), a sufficient reinforcing effect could not be obtained.

[0060] By the way, with respect to the reinforcing ribs 10, 10a, 10b of FIGS. 1 to 6 and the reinforcing rib 10 of FIGS. 7 and 8, the distance D from the opening 9 is set so that the compressive strength is not less than a predetermined value. Specific force with the width G2 of the lower part P1 of the wall 11F It is set to an appropriate dimension.

FIG. 14 is a graph showing the relationship between the width G2 of the lower part P1 of the front wall 11F and the separation distance D from the opening 9 of the reinforcing rib. From the graph of Fig. 14, it was also confirmed that if the distance D is set in the range of 5% to 40% of the width G2 of the lower part P1 of the front wall 11F, sufficient compressive strength can be obtained.

[0062] If the width G2 of the lower part P1 of the front wall 11F is narrower than the width A of the opening 9 (black circle in Fig. 14), the ratio of the width G2 and the distance D (D / It was also confirmed that the range of G2) was narrower than when the width W of the opening 9 was equal to or greater than the width W (square or triangle in Fig. 14). It was also confirmed that if the width G2 is kept constant and the separation distance D is reduced, the reinforcing effect is significantly reduced.

[0063] When the reinforcing effect is small, the buckling position exists in the lower part P1 of the front wall 11F adjacent to the opening 9, similarly to the case without ribs shown in FIG. However, if the reinforcing effect is large In this case, the buckling position has moved above the reinforcing rib 10, that is, to the upper part P2 of the front wall 11F wider than the lower part P1.

[0064] (Summary of study results)

(1) Reinforcing ribs 10, 10a, 10b are considerably limited compared to the reinforcing effect of vertical ribs. For this reason, the reinforcing effect is further enhanced by combining the horizontal rib and the vertical rib.

[0065] (2) When the length of the longitudinal rib is not less than the height H of the opening 9, the deformation due to the compressive load is effectively suppressed as compared with the case where the length of the opening 9 is less than the height H. be able to. Therefore, it is desirable to make the length of the longitudinal rib longer than the height H of the opening 9.

[0066] (3) When the length of the lateral rib is equal to the width W of the opening 9, almost no reinforcing effect is obtained. However, if the length of the lateral rib is made longer than the width W of the opening 9, the reinforcing effect is further enhanced. Therefore, it is preferable to make the length of the lateral rib larger than the width W of the opening 9.

(4) Even if the arc-shaped reinforcing ribs are arranged at the corners of the opening 9, almost no reinforcing effect can be obtained. However, if the reinforcing rib and the longitudinal rib are combined, the reinforcing effect is further enhanced.

[0068] (5) When a plurality of vertical ribs are provided under the above conditions, the compressive strength during stacking is greatly improved.

Claims

The scope of the claims

[1] A box-shaped casing (1) that houses at least a heat exchanger (5), a blower (6), and a compressor (3), and an opening (9) in the front wall (11F) of the casing (1) An air conditioner outdoor unit provided with

Reinforcing ribs (10), (10a), (10b) for improving the compressive strength in the vicinity of the opening (9) are provided in the vicinity of the opening (9) of the front wall (11F). An outdoor unit for an air conditioner characterized by that.

[2] The reinforcing ribs (10), (10a), (10b) extend in the longitudinal direction.

1. The outdoor unit for an air conditioner according to 1.

[3] The reinforcing ribs (10), (10a), (10b) extend upward from the side of the opening (9) and are provided along the edge of the opening (9). The outdoor unit for an air conditioner according to claim 1 or 2, wherein the outdoor unit is an air conditioner outdoor unit.

[4] The length of the reinforcing rib (10), (10a), (10b) is set corresponding to the height of the opening (9). The outdoor unit for air conditioners described.

[5] A plurality of reinforcing ribs (10a, 10b) are provided, and the reinforcing ribs (10a, 10b) are arranged in parallel to each other, according to any one of claims 1 to 4. The outdoor unit for air conditioners described.

[6] The reinforcing ribs (10), (10a), (10b) are characterized in that a part of the front wall (1 IF) is press-formed and formed into a U-shaped cross section. Item 6. The outdoor unit for an air conditioner according to any one of Items 1 to 5.