Air conditioning device and air purifier

Abstract

A suction-side flow path (13) is provided between the suction opening (12) of the housing (10) and the suction opening (21) of the fan (20). The muffler (30) has a propagation path (31) through which sound is propagated. The muffler (30) has an opening (32) that opens at one end of the propagation path (31) and communicates with the suction-side flow path (13), and a closing part (33) that closes the other end of the propagation path (31) and reflects sound that has passed through the propagation path (31) toward the opening (32).

Description

Technical Field

[0001] The present invention relates to an air conditioning device and an air purifier. Background Art

[0002] Patent Document 1 discloses an air cleaner in which a HEPA filter as a first filter and a deodorizing filter as a second filter are arranged close to and facing each other on the downstream side of an air flow.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent No. 6477798 Summary of the invention

[0006] -Technical problem to be solved by the invention-

[0007] Here, the sound generated on the outlet side of the fan is soundproofed by the HEPA filter which is a high pressure loss filter. In this way, the sound generated on the outlet side of the fan can be reduced.

[0008] On the other hand, since the HEPA filter is arranged, the pressure loss of the flow path on the outlet side of the fan increases. As a result, the rotation speed of the fan increases, which may cause the sound generated on the suction side of the fan to become louder.

[0009] An object of the present disclosure is to reduce the sound generated on the suction side of a fan.

[0010] -Technical solutions to solve technical problems-

[0011] The first aspect of the present disclosure relates to an air conditioning device, which includes a frame 10 and a fan 20 arranged inside the frame 10. An inlet side flow path 13 is provided between the inlet opening 12 of the frame 10 and the inlet port 21 of the fan 20, and the air conditioning device includes a cylindrical muffler 30, the muffler 30 having a propagation path 31 for propagating sound, the muffler 30 having an opening portion 32 and a closing portion 33, the opening portion 32 is open at one end of the propagation path 31 and communicates with the inlet side flow path 13, the closing portion 33 seals the other end of the propagation path 31 and reflects the sound passing through the propagation path 31 toward the opening portion 32.

[0012] In the first aspect, the sound generated in the suction side flow path 13 is propagated in the propagation path 31 of the muffler 30 and reflected in the closed portion 33 of the muffler 30, and then the sound waves with opposite phases are superimposed at the opening portion 32, thereby reducing the protruding noise generated in the suction side flow path 13.

[0013] According to the second aspect of the present disclosure, based on the air-conditioning device described in the first aspect, when the propagation direction of sound in the suction side flow path 13 is set to a first direction and the direction orthogonal to the first direction is set to a second direction, the average length of the opening portion 32 of the silencer 30 in the second direction is longer than the average length of the opening portion 32 of the silencer 30 in the first direction.

[0014] In the second aspect, the noise reduction effect can be enhanced by improving the shape of the opening 32 of the muffler 30 .

[0015] A third aspect of the present disclosure is the air conditioning device according to the first or second aspect, wherein the sound generated in the suction-side flow path ( 13 ) is caused by the rotation of the fan ( 20 ).

[0016] In the third aspect, the sound generated by the rotation of the fan 20 can be reduced.

[0017] A fourth aspect of the present disclosure is the air conditioning device according to the first or second aspect, wherein the sound generated in the suction-side flow path 13 is caused by a resonance sound due to the shape of the frame 10 .

[0018] In the fourth aspect, the sound caused by the resonance sound due to the shape of the housing 10 can be reduced.

[0019] The fifth aspect of the present disclosure is based on the air-conditioning device described in any one of the first to fourth aspects, and when the cross-sectional area of ​​the opening portion 32 of the silencer 30 is set to S and the cross-sectional area of ​​the suction side flow path 13 in a direction orthogonal to the axial direction of the fan 20 is set to S0, the condition of 0.02<S / S0 is satisfied.

[0020] In the fifth aspect, by appropriately setting the cross-sectional area of ​​the opening 32 of the muffler 30 , the noise reduction effect can be improved.

[0021] A sixth aspect of the present disclosure is based on the air conditioning device described in the fifth aspect, and satisfies the condition of S / S0<0.05.

[0022] In the sixth aspect, by appropriately setting the cross-sectional area of ​​the opening 32 of the muffler 30 , the noise reduction effect can be improved.

[0023] In the seventh aspect of the present disclosure, on the basis of the air-conditioning device described in any one of the first to sixth aspects, a silencer chamber 36 is arranged in the suction side flow path 13, the opening portion 32 of the silencer 30 is connected to the silencer chamber 36, and when the cross-sectional area of ​​the silencer chamber 36 in a direction orthogonal to the axial direction of the fan 20 is set to S0, the cross-sectional area of ​​the suction port 21 of the fan 20 is set to S1, and the cross-sectional area of ​​the suction opening 12 of the frame 10 is set to S2, the conditions of S1<S0, S2<S0 are satisfied, and the volume of the silencer 30 is smaller than the volume of the silencer chamber 36.

[0024] In the seventh aspect, in the sound-absorbing chamber 36 having a volume larger than that of the silencer 30, the sound can be attenuated by the sound waves reflected by the partition 35 and the wall of the frame 10, and the sound waves reflected by the closed portion 33 of the silencer 30 can offset the sound waves that cannot be completely silenced in the sound-absorbing chamber 36.

[0025] The eighth aspect of the present disclosure is based on the air-conditioning device described in the seventh aspect, and the air-conditioning device includes a partition 35, and the partition 35 divides the interior of the frame 10 into a fan chamber 37 and a silencer chamber 36. The fan 20 is arranged in the fan chamber 37, and the silencer chamber 36 allows sound to propagate upstream of the fan chamber 37 in the air flow direction, and a connecting port 35a connected to the suction port 21 of the fan 20 is formed on the partition 35.

[0026] In the eighth aspect, the silencing chamber 36 can be formed by partitioning the interior of the housing 10 with the partition plate 35 .

[0027] According to a ninth aspect of the present disclosure, in the air conditioning device according to the seventh aspect, the muffler ( 30 ) reduces resonance sound that depends on the volume of the suction-side flow path ( 13 ).

[0028] In the ninth aspect, the resonance sound depending on the volume of the suction-side flow path 13 can be reduced.

[0029] According to a tenth aspect of the present disclosure, in addition to the air conditioning device according to any one of the first to ninth aspects, the opening portion 32 of the muffler 30 opens in the same direction as a propagation direction of sound in the suction side flow path 13 .

[0030] In the tenth aspect, by aligning the opening direction of the opening 32 of the muffler 30 with the propagation direction of sound in the suction side flow path 13, the amount of sound waves incident on the propagation path 31 of the muffler 30 can be increased, thereby improving the noise reduction effect.

[0031] According to an eleventh aspect of the present disclosure, based on the air conditioning device described in any one of the first to ninth aspects, the opening portion 32 of the silencer 30 is provided along the outer peripheral edge of the suction port 21 as viewed from the axial direction of the fan 20 .

[0032] In the eleventh aspect, silencer 30 can be disposed near suction port 21 of fan 20 at a position that does not hinder the flow of air sucked into fan 20 .

[0033] A twelfth aspect of the present disclosure is the air conditioning device according to any one of the first to eleventh aspects, wherein a plurality of silencers 30 are provided.

[0034] In the twelfth aspect, by providing a plurality of silencers 30 , the noise reduction effect can be further improved.

[0035] According to a thirteenth aspect of the present disclosure, in the air conditioning device according to any one of the first to twelfth aspects, the muffler 30 includes a bent portion 34 formed by bending a portion of the propagation path 31 .

[0036] In the thirteenth aspect, by bending the propagation path 31 of the silencer 30 , the degree of freedom in layout of the silencer 30 can be improved, and the total length of the propagation path 31 can be lengthened.

[0037] According to a fourteenth aspect of the present disclosure, based on the air conditioning device described in any one of the first to thirteenth aspects, the length of the transmission path 31 of the silencer 30 is set according to the frequency of the sound.

[0038] In the fourteenth aspect, by setting the length of the propagation path 31 according to the frequency of the sound, the noise reduction effect of the silencer 30 can be improved.

[0039] A fifteenth aspect of the present disclosure relates to an air purifier, which includes the air conditioning device 1 described in any one of the first to fourteenth aspects.

[0040] In a fifteenth aspect, an air cleaner including the air conditioning device 1 can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a front cross-sectional view showing the structure of the air conditioning device of the first embodiment;

[0042] Figure 2 It is a front cross-sectional view illustrating the propagation direction of the sound wave;

[0043] Figure 3 is a top cross-sectional view showing the structure of the air conditioning device;

[0044] Figure 4is a front cross-sectional view showing the structure of an air conditioning device according to a second embodiment;

[0045] Figure 5 is a graph showing the relationship between frequency and sound pressure level when a silencer is installed;

[0046] Figure 6 is a graph showing the relationship between frequency and sound pressure level when the length of the propagation path of the muffler is changed;

[0047] Figure 7 is a graph showing the relationship between the frequency and the amount of attenuation when the volume of the anechoic chamber is changed;

[0048] Figure 8 is a graph showing the relationship between frequency and amount of attenuation when a muffler is installed in a muffler chamber;

[0049] Fig. 9 is a graph showing the relationship between the cross-sectional area ratio of the opening and the suction side flow path and the volume reduction;

[0050] Fig.10 is a top cross-sectional view for explaining the shape of the opening portion of the muffler when the aspect ratio is changed;

[0051] Fig.11 is a graph showing the relationship between the frequency and the sound pressure level when the aspect ratio of the opening of the muffler is changed;

[0052] Fig.12 is a front cross-sectional view showing the structure of an air conditioning device according to a third embodiment;

[0053] Fig.13 is a graph showing the relationship between frequency and attenuation amount when a first silencer and a second silencer are provided in a anechoic chamber;

[0054] Fig.14 is a front cross-sectional view showing the structure of an air conditioning device according to a fourth embodiment;

[0055] Fig.15 is a side sectional view showing the structure of the air conditioning device;

[0056] Fig.16 is a front cross-sectional view showing the structure of an air conditioning device according to a fifth embodiment;

[0057] Fig.17 is a side sectional view showing the structure of the air conditioning device;

[0058] Fig.18 is a front cross-sectional view showing the structure of an air conditioning device according to a sixth embodiment;

[0059] Fig.19 is a side sectional view showing the structure of the air conditioning device;

[0060] Fig. 20 is a front cross-sectional view showing the structure of an air conditioning device according to a seventh embodiment;

[0061] Fig.21 is a side sectional view showing the structure of the air conditioning device;

[0062] Fig. 22 is a front cross-sectional view showing the structure of an air conditioning device according to an eighth embodiment;

[0063] Fig.23 is a side sectional view showing the structure of the air conditioning device;

[0064] Fig.24 is a front cross-sectional view showing the structure of an air conditioning device according to a ninth embodiment;

[0065] Fig.25 is a front cross-sectional view showing the structure of an air conditioning device according to a tenth embodiment;

[0066] Fig.26 is a side sectional view showing the structure of the air conditioning device;

[0067] Fig. 27 is a front cross-sectional view showing the structure of the air conditioning device in a state where the humidifying device is omitted from the illustration;

[0068] Fig.28 It is a side cross-sectional view showing the structure of the air-conditioning device in a state where the humidifying device is omitted from the illustration. DETAILED DESCRIPTION

[0069] (First Embodiment)

[0070] like Figure 1 As shown, the air conditioning device 1 includes a frame 10, a filter 18, and a fan 20. In this embodiment, the air conditioning device 1 is an air purifier.

[0071] The frame 10 is formed into a box shape with a long longitudinal length. The frame 10 is made of, for example, a resin material. A top plate 11 extending in a horizontal direction is arranged inside the frame 10. The inside of the frame 10 is divided into a first space S1 and a second space S2 by the top plate 11. The first space S1 is formed below the top plate 11. The second space S2 is formed above the top plate 11.

[0072] The frame 10 is formed with a suction opening 12 communicating with the first space S1. Figure 1 In the embodiment, suction openings 12 are formed on the left and right walls of the frame 10 .

[0073] The fan 20 is arranged in the first space S1. The fan 20 is composed of a Sirocco fan. The suction port 21 of the fan 20 is arranged opposite to the suction opening 12 of the frame 10. In this way, a suction side flow path 13 is formed between the suction opening 12 of the frame 10 and the suction port 21 of the fan 20 in the first space S1. The blow-out port 22 of the fan 20 passes through the top plate 11 and opens toward the second space S2.

[0074] The frame 10 is formed with a blow-out opening 15 communicating with the second space S2. Figure 1 In the embodiment, the blow-out opening 15 is formed in the wall portion located on the upper side of the frame body 10 .

[0075] An outlet flow path 16 is provided between the outlet opening 15 of the housing 10 and the outlet port 22 of the fan 20. A filter 18 is disposed in the middle of the outlet flow path 16. The filter 18 is, for example, a HEPA filter (High Efficiency Particulate Air Filter).

[0076] A throttle portion 17 is provided on the downstream side of the outlet-side flow path 16 downstream of the filter 18 so as to narrow the flow path area of ​​the outlet-side flow path 16 .

[0077] If the fan 20 is rotated, Figure 1 As shown by the hollow white arrow, the air sucked from the suction opening 12 of the frame 10 is sucked into the suction port 21 of the fan 20 through the suction side flow path 13. The air sucked into the fan 20 is blown out from the blow-out port 22 to the blow-out side flow path 16 of the second space S2. The dust contained in the air blown out to the blow-out side flow path 16 is collected by the filter 18 when passing through the filter 18. The air from which the dust has been removed is blown out from the blow-out opening 15 of the frame 10.

[0078] 〈Silencer〉

[0079] In the air conditioning device 1, a protruding noise is generated with the operation of the fan 20. The sound generated on the outlet side of the fan 20 is soundproofed by the filter 18. In this way, the sound generated on the outlet side of the fan 20 can be reduced.

[0080] On the other hand, the flow path pressure loss on the outlet side of the fan 20 increases by arranging the filter 18. Furthermore, by providing the throttle portion 17 in the middle of the outlet side flow path 16, the flow path pressure loss on the outlet side of the fan 20 also increases.

[0081] As a result, the rotation speed of fan 20 may increase, and the sound generated on the suction side of fan 20 may become louder.

[0082] Therefore, in the present embodiment, the silencer 30 is provided to reduce the sound generated on the suction side of the fan 20 .

[0083] Specifically, if Figure 2 As shown in FIG. 1 , the silencer 30 is formed into a cylindrical shape having a propagation path 31 for propagating sound. The silencer 30 has an opening 32 and a closing portion 33. The opening 32 is located at one end of the propagation path 31 ( Figure 2 The closing portion 33 closes the other end (the lower end) of the propagation passage 31 and communicates with the suction side flow path 13. Figure 2 The upper end is sealed and the sound passing through the propagation path 31 is reflected toward the opening 32. Figure 2 The arrows in the figure indicate the direction of sound wave propagation.

[0084] It should be noted that the sound generated in the suction-side flow path 13 is a protruding noise generated by the rotation of the fan 20 or a protruding noise caused by a resonance sound based on the shape of the housing 10 .

[0085] like Figure 3 As shown, the propagation direction of the sound in the suction side flow path 13 is set to the first direction, and the direction orthogonal to the first direction is set to the second direction. At this time, the shape of the opening 32 is set so that the average length of the opening 32 of the muffler 30 in the second direction is longer than the average length of the opening 32 of the muffler 30 in the first direction.

[0086] Specifically, assuming that the average length of the opening 32 of the muffler 30 in the first direction is x and the average length of the opening 32 of the muffler 30 in the second direction is y, the average length y in the second direction is longer than the average length x in the first direction.

[0087] like Figure 2 As shown, the silencer 30 is installed on the top plate 11 that separates the first space S1. A hole corresponding to the opening 32 of the silencer 30 is formed on the top plate 11. A portion of the first sound wave 25 generated by the fan 20 and propagated in the suction side flow path 13 passes through the propagation path 31 from the opening 32 of the silencer 30. The sound wave passing through the propagation path 31 is reflected by the closed portion 33 and becomes a second sound wave 26 with an opposite phase. The second sound wave 26 passes through the propagation path 31 and is transmitted from the opening 32.

[0088] Thus, by superimposing the first sound wave 25 propagating in the suction side flow path 13 and the second sound wave 26 transmitted from the muffler 30, a part of the first sound wave 25 and the second sound wave 26 cancel each other out. Thus, the sound propagating in the suction side flow path 13 can be weakened.

[0089] - Effects of the First Embodiment -

[0090] According to the characteristics of this embodiment, the sound generated in the suction side flow path 13 is propagated in the propagation path 31 of the silencer 30, reflected at the closed portion 33 of the silencer 30, and then the sound waves with opposite phases are superimposed at the opening portion 32, thereby reducing the protruding noise generated in the suction side flow path 13.

[0091] According to the feature of this embodiment, the average length of the opening 32 of the muffler 30 in the second direction is longer than the average length of the opening 32 in the first direction. By improving the shape of the opening 32 of the muffler 30 in this way, the noise reduction effect can be improved.

[0092] According to the features of this embodiment, the sound generated by the rotation of the fan 20 can be reduced.

[0093] According to the features of this embodiment, it is possible to reduce the sound caused by the resonance sound due to the shape of the housing 10 .

[0094] (Second Embodiment)

[0095] Hereinafter, the same reference numerals are used to denote the same components as those in the first embodiment, and only the different points will be described.

[0096] like Figure 4 As shown, the interior of the frame 10 is divided into a first space S1 and a second space S2 by a top plate 11 .

[0097] A partition 35 is provided in the first space S1. The partition 35 extends in the up-down direction in the first space S1. The partition 35 divides the interior of the first space S1 into a fan chamber 37 and a muffler chamber 36. The fan 20 is arranged in the fan chamber 37. The muffler chamber 36 allows sound to propagate upstream of the fan chamber 37 in the air flow direction. Figure 4 In the figure, arrows are used to indicate the direction of sound wave propagation.

[0098] The partition plate 35 has a communication port 35a communicating with the suction port 21 of the fan 20. The suction side flow path 13 includes a muffler chamber 36. The muffler 30 is disposed on the muffler chamber 36 side of the suction side flow path 13. The opening 32 of the muffler 30 communicates with the muffler chamber 36.

[0099] In this embodiment, when the cross-sectional area of ​​the muffler chamber 36 in the direction orthogonal to the axial direction of the fan 20 is set to S0, the cross-sectional area of ​​the suction port 21 of the fan 20 is set to S1, and the cross-sectional area of ​​the suction opening 12 of the frame 10 is set to S2, the conditions of S1<S0, S2<S0 are satisfied. In addition, the volume of the muffler 30 is set to be smaller than the volume of the muffler chamber 36.

[0100] like Figure 4As shown by the arrow line in , in the silencing chamber 36, the sound waves generated by the fan 20 and propagating in the suction side flow path 13 propagate toward the corner of the wall of the frame 10 and the top plate 11 constituting the silencing chamber 36 and then reflect. Therefore, the sound waves propagating inside the silencing chamber 36 are attenuated by the sound waves with opposite phases.

[0101] The silencing chamber 36 can achieve a silencing effect in a wide frequency range, but on the other hand, a resonance sound depending on the volume space may exist at a specific frequency. Here, in this embodiment, since the muffler 30 is provided in the silencing chamber 36, the sound waves that are not sufficiently attenuated in the silencing chamber 36 are propagated and reflected in the propagation path 31 of the muffler 30, thereby further attenuating the sound waves in the silencing chamber 36.

[0102] Specifically, if Figure 5 As shown in the graph, when the silencer 30 is not provided in the anechoic chamber 36, a noise of 111 dBA is generated at a frequency of 650 Hz. On the other hand, when the silencer 30 is provided in the anechoic chamber 36, the noise is reduced to 100 dBA at a frequency of 650 Hz, which indicates that a sound reduction effect is achieved.

[0103] 〈About the length of the transmission path of the silencer〉

[0104] Preferably, the length of the transmission path 31 of the muffler 30 is set according to the frequency of the sound. Figure 6 As shown in the graph, the length of the transmission path 31 of the silencer 30 is set to 105 mm, 120 mm, and 180 mm, for example, and the change in the sound pressure level is analyzed. As a result, it can be seen that the longer the transmission path 31 of the silencer 30 is, the higher the sound reduction effect in the low frequency domain is. It can also be seen that even if the length of the transmission path 31 is changed, the width of the frequency with the sound reduction effect is constant, and the width is about 50 Hz.

[0105] By setting the length of the propagation path 31 according to the frequency of the sound in this way, the noise reduction effect of the silencer 30 can be improved.

[0106] 〈About the volume of the anechoic chamber〉

[0107] Next, the change in the amount of attenuation when the volume of the silencing chamber 36 is changed will be described. Figure 4 As shown in FIG. 1 , the volume of the muffler chamber 36 is determined by the position of the partition plate 35 in the left-right direction. Figure 4 The authors studied how the attenuation volume changes when the distance from the left side wall to the partition 35 is changed.

[0108] exist Figure 7In the curve graph, the reduction amount is compared between the case where the partition 35 is not provided and the case where the distance from the wall of the frame 10 to the partition 35 is set to 60 mm, 180 mm, and 270 mm. Figure 7 In the curve diagram of , a case where the silencer 30 is not provided is studied.

[0109] like Figure 7 As shown, it can be seen that when the partition 35 is provided to form the muffler chamber 36, there is a peak frequency with a high sound reduction effect, compared with the case where there is no partition 35. On the other hand, it can be seen that even if the volume of the muffler chamber 36 is changed, there will be an area with poor sound reduction in the same part, and the poor sound reduction is caused by the generation of resonance sound that depends on the volume of the suction side flow path 13.

[0110] In contrast, Figure 8 As shown, it can be seen that when the silencer 30 is installed in the silencer chamber 36, the sound waves that are not completely silenced in the silencer chamber 36 are offset by the sound waves reflected by the sealing portion 33 of the silencer 30, thereby shifting the resonance sound of the silencer chamber 36 to a low frequency domain.

[0111] 〈About the cross-sectional area of ​​the muffler opening〉

[0112] Preferably, the cross-sectional area of ​​the opening 32 of the muffler 30 is set as follows. Figure 4 As shown, the cross-sectional area of ​​the opening 32 of the muffler 30 is represented by S, and the cross-sectional area of ​​the suction-side flow path 13 in a direction perpendicular to the axial direction of the fan 20 is represented by S0.

[0113] like Fig. 9 As shown in the graph of , it can be seen that the reduction amount tends to increase in the range of 0.02<S / S0<0.05. Therefore, in the present embodiment, the cross-sectional area of ​​the opening 32 of the muffler 30 is set to satisfy the condition of 0.02<S / S0<0.05.

[0114] 〈About the shape of the muffler opening〉

[0115] Next, the effect of the shape of the opening 32 of the muffler 30 on the sound pressure level was studied. Fig.10 As shown, the propagation direction of the sound in the suction side flow path 13 is set to the first direction, and the direction orthogonal to the first direction is set to the second direction. The shape of the opening 32 of the muffler 30 is rectangular. The average length of the opening 32 of the muffler 30 in the first direction is set to x, and the average length of the opening 32 of the muffler 30 in the second direction is set to y. The aspect ratio a is calculated by a=y / x. At this time, the cross-sectional area of ​​the opening 32 of the muffler 30 is kept constant.

[0116] When the aspect ratio a is increased, the average length y in the second direction is greater than the average length x in the first direction. Fig.11 As shown in the curve graph, it can be seen that the larger the aspect ratio, the wider the frequency bandwidth with the sound reduction effect.

[0117] Here, it is considered that the improvement of the sound diffraction effect brought about by the change in the cross-sectional shape is the reason for the widening of the frequency band width. By increasing the length of the opening 32 in the second direction orthogonal to the first direction relative to the length of the opening 32 in the first direction, the diffraction region is widened, and the amount of sound waves incident into the muffler 30 is increased. As a result, the amount of sound waves reflected by the muffler 30 is also increased, so that the sound reduction effect is improved in a wider frequency band centered on the resonance frequency of the muffler 30.

[0118] - Effects of the Second Embodiment -

[0119] According to the features of this embodiment, the noise reduction effect can be enhanced by appropriately setting the cross-sectional area of ​​the opening 32 of the silencer 30 .

[0120] According to the features of this embodiment, the noise reduction effect of the silencer 30 can be enhanced by setting the length of the propagation path 31 according to the frequency of the sound.

[0121] According to the characteristics of this embodiment, in the sound-absorbing chamber 36 having a volume larger than that of the silencer 30, the sound can be attenuated by the sound waves reflected by the partition 35 and the wall of the frame 10, and the sound waves reflected by the closed portion 33 of the silencer 30 can offset the sound waves that cannot be completely silenced in the sound-absorbing chamber 36.

[0122] According to the features of this embodiment, the resonance sound that depends on the volume of the suction-side flow path 13 can be reduced.

[0123] According to the features of this embodiment, the muffler chamber 36 can be formed by partitioning the interior of the housing 10 with the partition 35. Even when the interior of the suction side flow path 13 is used as the muffler chamber 36 without the partition 35, the noise reduction effect can be obtained.

[0124] (Third Embodiment)

[0125] Hereinafter, the same reference numerals are used for the same parts as those in the second embodiment, and only the different points will be described.

[0126] like Fig.12 As shown, the interior of the frame 10 is divided into a first space S1 and a second space S2 by a top plate 11 .

[0127] A partition 35 is provided in the first space S1. The partition 35 extends in the up-down direction in the first space S1. The partition 35 divides the interior of the first space S1 into a fan chamber 37 and a muffler chamber 36. The fan 20 is arranged in the fan chamber 37. The muffler chamber 36 allows sound to propagate upstream of the fan chamber 37 in the air flow direction. Fig.12 In the figure, arrows are used to indicate the direction of sound wave propagation.

[0128] The partition plate 35 has a communication port 35a formed therein. The communication port 35a communicates with the suction port 21 of the fan 20. The suction side flow path 13 includes a muffler chamber 36.

[0129] A plurality of silencers 30 are provided. Fig.12 In the example shown, two silencers 30 are provided. The two silencers 30 are arranged on the wall side of the frame 10 and the top plate 11 side, respectively. In the following description, the silencer 30 on the wall side of the frame 10 is referred to as a first silencer 30, and the silencer 30 arranged on the top plate 11 side is referred to as a second silencer 30.

[0130] exist Fig.12 In the embodiment, the first muffler 30 is disposed on the left side wall of the frame 10. Fig.12 In the embodiment, the propagation path 31 of the first muffler 30 extends in the left-right direction. The opening 32 of the first muffler 30 faces the first direction ( Fig.12 in the middle) opening.

[0131] The second muffler 30 is disposed on the top plate 11. Fig.12 In the embodiment, the propagation path 31 of the second silencer 30 extends in the vertical direction. The opening 32 of the second silencer 30 is oriented in a second direction ( Fig.12 The bottom of the opening.

[0132] like Fig.13 As shown in the curve graph, it can be seen that: no matter whether the first silencer 30 is provided or the second silencer 30 is provided, the sound waves that cannot be completely silenced in the silencer chamber 36 can be offset by the sound waves reflected by the closed portion 33 of the silencer 30, thereby shifting the resonant sound of the silencer chamber 36 to the low frequency domain.

[0133] It can also be seen that the first silencer 30 , in which the opening direction of the opening 32 is aligned with the propagation direction of the sound in the silencer chamber 36 , has a greater reduction volume than the second silencer 30 .

[0134] - Effects of the Third Embodiment -

[0135] According to the features of this embodiment, by aligning the opening direction of the opening 32 of the muffler 30 with the propagation direction of sound in the suction side flow path 13, the amount of sound waves incident on the propagation path 31 of the muffler 30 can be increased, thereby improving the noise reduction effect.

[0136] According to the features of this embodiment, by providing a plurality of silencers 30 , the noise reduction effect can be further improved.

[0137] (Fourth Embodiment)

[0138] like Fig.14 and Fig.15 As shown, the interior of the frame 10 is divided into a first space S1 and a second space S2 by a top plate 11. It should be noted that Fig.15 Seen from the right Fig.14 A side cross-sectional view of the frame 10 in FIG.

[0139] A plurality of silencers 30 are arranged in the first space S1. Fig.14 and Fig.15 In the example shown, two silencers 30 are provided.

[0140] exist Fig.14 In the embodiment, the upper silencer 30 is arranged closer to the fan 20. Fig.14 The upper silencer 30 has a transmission path 31 extending in the left-right direction. Fig.14 The right side of ( Fig.15 The upper side of the muffler 30 is provided with an opening 32. Fig.14 The left side of ( Fig.15 In this way, the opening 32 of the upper muffler 30 opens toward the first direction which is the same as the propagation direction of the sound in the suction side flow path 13.

[0141] exist Fig.14 In the embodiment, the lower muffler 30 is arranged closer to the fan 20. Fig.14 The lower muffler 30 has a propagation path 31 extending in the depth direction of the paper. Fig.14 The paper depth side ( Fig.15 The lower silencer 30 is provided with an opening 32. Fig.14 The paper and front side ( Fig.15 A closing portion 33 is provided on the left side of the lower muffler 30. In this way, the opening 32 of the lower muffler 30 opens in a second direction orthogonal to the first direction.

[0142] - Effects of the Fourth Embodiment -

[0143] According to the features of this embodiment, the space of the entire device can be saved by placing the silencer 30 in the housing 10. In addition, by providing a plurality of silencers 30, the noise reduction effect can be further improved.

[0144] (Fifth Embodiment)

[0145] like Fig.16 and Fig.17 As shown, the interior of the frame 10 is divided into a first space S1 and a second space S2 by a top plate 11. It should be noted that Fig.17 Seen from the left Fig.16 A side cross-sectional view of the frame 10 in FIG.

[0146] A silencer 30 is arranged in the first space S1. Fig.16 In the figure, the silencer 30 is arranged at a position closer to the paper surface than the fan 20. The silencer 30 has a transmission path 31 extending in the left-right direction. Fig.16 on the right side and the front side of the paper ( Fig.17 The silencer 30 is provided with an opening 32 on the right side of the paper. Fig.16 The left side of ( Fig.17 A closing portion 33 is provided on the front side of the paper.

[0147] like Fig.17 As shown, the opening 32 of the muffler 30 is arranged along the outer periphery of the suction port 21 as viewed from the axial direction of the fan 20. Specifically, the surface of the muffler 30 where the opening 32 opens is formed in a shape extending along the outer periphery of the fan 20 body.

[0148] - Effects of the Fifth Embodiment -

[0149] According to the features of the present embodiment, the silencer 30 can be disposed near the suction port 21 of the fan 20 at a position that does not hinder the flow of air sucked into the fan 20 .

[0150] (Sixth Embodiment)

[0151] like Fig.18 and Fig.19 As shown, the interior of the frame 10 is divided into a first space S1 and a second space S2 by a top plate 11. It should be noted that Fig.19 Seen from the left Fig.18 A side cross-sectional view of the frame 10 in FIG.

[0152] A silencer 30 is arranged in the first space S1. Fig.18 In the embodiment, the silencer 30 is arranged at a position further to the right than the fan 20.

[0153] The silencer 30 includes a propagation passage 31, an opening 32, a closing portion 33, and a bent portion 34. The bent portion 34 is formed by bending a portion of the propagation passage 31.

[0154] like Fig.19 As shown, the transmission path 31 of the muffler 30 includes: a first path 41 extending along the bottom of the frame 10 and in the left-right direction, a second path 42 bending upward from the left end of the first path 41 and extending upward along the wall of the frame 10, and a third path 43 bending rightward from the upper end of the second path 42 and extending in the left-right direction. The bent portion 34 includes the second path 42.

[0155] exist Fig.19 In the drawing, the opening 32 is provided on the front side of the third passage 43. The opening 32 is provided along the outer peripheral edge of the suction port 21 when viewed from the axial direction of the fan 20. Fig.19 In the embodiment, the closing portion 33 is disposed on the right side of the first passage 41 .

[0156] - Effects of the Sixth Embodiment -

[0157] According to the features of this embodiment, by bending the propagation path 31 of the silencer 30 , the degree of freedom in layout of the silencer 30 can be improved, and the total length of the propagation path 31 can be lengthened.

[0158] According to the features of the present embodiment, the silencer 30 can be disposed near the suction port 21 of the fan 20 at a position that does not hinder the flow of air sucked into the fan 20 .

[0159] (Seventh Embodiment)

[0160] like Fig. 20 and Fig.21 As shown, the interior of the frame 10 is divided into a first space S1 and a second space S2 by a top plate 11. It should be noted that Fig.21 Seen from the left Fig. 20 A side cross-sectional view of the frame 10 in FIG.

[0161] A silencer 30 is arranged in the first space S1. Fig. 20 In the embodiment, the silencer 30 is arranged at a position further to the right than the fan 20.

[0162] The silencer 30 includes a propagation passage 31, an opening 32, a closing portion 33, and a bent portion 34. The bent portion 34 is formed by bending a portion of the propagation passage 31.

[0163] like Fig.21As shown, the transmission path 31 of the muffler 30 includes: a first path 41 extending along the bottom of the frame 10 and in the left-right direction, a second path 42 bending upward from the left end of the first path 41 and extending upward along the wall of the frame 10, and a third path 43 bending rightward from the upper end of the second path 42 and extending in the left-right direction. The bent portion 34 includes the second path 42.

[0164] exist Fig.21 In the embodiment, the opening 32 is arranged on the right side of the third passage 43. The opening 32 is arranged along the outer peripheral edge of the suction port 21 when viewed from the axial direction of the fan 20. Fig.21 In the embodiment, the closing portion 33 is disposed on the right side of the first passage 41 .

[0165] - Effects of the Seventh Embodiment -

[0166] According to the features of this embodiment, by bending the propagation path 31 of the silencer 30 , the degree of freedom in layout of the silencer 30 can be improved, and the total length of the propagation path 31 can be lengthened.

[0167] According to the features of this embodiment, the silencer 30 can be arranged near the suction port 21 of the fan 20 at a position that does not hinder the flow of air sucked into the fan 20 .

[0168] (Eighth Embodiment)

[0169] like Fig. 22 and Fig.23 As shown, the interior of the frame 10 is divided into a first space S1 and a second space S2 by a top plate 11. It should be noted that Fig.23 Seen from the left Fig. 22 A side cross-sectional view of the frame 10 in FIG.

[0170] The silencer 30 is arranged to span the first space S1 and the second space S2. Fig. 22 In the embodiment, the silencer 30 is arranged at a position further to the left than the fan 20.

[0171] The silencer 30 includes a propagation passage 31, an opening 32, a closing portion 33, and a bent portion 34. The bent portion 34 is formed by bending a portion of the propagation passage 31.

[0172] like Fig.23 As shown, the propagation path 31 of the muffler 30 includes a first path 41 extending upward along the left side wall of the frame 10 and a second path 42 extending in the left-right direction by bending rightward from the upper end of the first path 41. The bent portion 34 includes the second path 42.

[0173] The first passage 41 extends in the up-down direction across the first space S1 and the second space S2, and the second passage 42 extends in the left-right direction in the second space S2.

[0174] exist Fig. 22 In the embodiment, the opening 32 is provided on the right side of the first passage 41 ( Fig.23 (the paper depth side). Fig. 22 In the embodiment, the sealing portion 33 is arranged on the paper depth side of the second passage 42 ( Fig.23 on the right side of the screen).

[0175] -Effects of the Eighth Embodiment-

[0176] According to the features of this embodiment, by bending the propagation path 31 of the silencer 30 , the degree of freedom in layout of the silencer 30 can be improved, and the total length of the propagation path 31 can be lengthened.

[0177] (Ninth Embodiment)

[0178] like Fig.24 As shown, the interior of the frame 10 is divided into a first space S1 and a second space S2 by a top plate 11. A silencer 30 is disposed in the first space S1 and the second space S2, respectively.

[0179] exist Fig.24 In the embodiment, the silencer 30 in the first space S1 is arranged at a position further to the left than the fan 20. The silencer 30 in the first space S1 has a propagation path 31 extending in the up-down direction. Fig.24 In the embodiment, the silencer 30 in the first space S1 is provided with an opening 32 at the lower right side. Fig.24 In the embodiment, the silencer 30 in the first space S1 is provided with a closing portion 33 on the upper side.

[0180] The silencer 30 in the second space S2 is provided on the wall portion for installing the filter 18. Fig.24 In the second space S2, the silencer 30 has a propagation path 31 extending in the up-down direction. Fig.24 In the second space S2, the silencer 30 is provided with an opening 32 at the lower side. Fig.24 In the embodiment, the silencer 30 in the second space S2 is provided with a closing portion 33 on the upper side.

[0181] - Effects of the Ninth Embodiment -

[0182] According to the features of this embodiment, by providing silencers 30 in first space S1 as the suction side of fan 20 and second space S2 as the discharge side of fan 20 , the noise reduction effect can be improved on both the suction side and the discharge side of fan 20 .

[0183] The above describes the implementation mode and the modified examples, but it should be understood that various changes can be made to the methods and specific circumstances without departing from the subject matter and scope of the claims. In addition, the elements involved in the above implementation mode, modified examples, and other implementation modes can also be appropriately combined or replaced. In addition, the words "first", "second", "third"... in the specification and claims are only used to distinguish the sentences containing the above words, and are not intended to limit the number or order of the sentences.

[0184] (Tenth Embodiment)

[0185] like Fig.25 and Fig.26 As shown in FIG. 1 , the frame 10 is formed in a box shape with a long longitudinal length. The frame 10 has a first space S1 inside. The frame 10 is provided with a suction opening 12 that communicates with the first space S1. Fig.25 In the embodiment, the suction opening 12 is formed on the left side wall of the frame 10. A filter 18 is arranged at the suction opening 12. It should be noted that, Fig.26 Seen from the left Fig.25 A side cross-sectional view of the frame 10 in FIG.

[0186] The fan 20 is arranged in the first space S1. The fan 20 is composed of a Sirocco fan. The suction port 21 of the fan 20 is arranged opposite to the suction opening 12 of the frame 10. In this way, a suction side flow path 13 is formed between the suction opening 12 of the frame 10 and the suction port 21 of the fan 20 in the first space S1. The blowout port 22 of the fan 20 penetrates the top plate 11 of the frame 10 and opens.

[0187] The air conditioner 1 includes a humidifier 50 . The humidifier 50 includes a water supply tank 51 , a water storage tank 52 , and a humidification filter 53 .

[0188] Water used for humidification is stored in the water supply tank 51. The water supply tank 51 can be attached to the frame 10 and can be detached from the frame 10, for example.

[0189] The water storage tank 52 is formed in a box shape with an upper opening. Water supplied from the water supply tank 51 is stored in the water storage tank 52.

[0190] The humidification filter 53 is formed in a disk shape. The humidification filter 53 is arranged at a position upstream of the suction port 21 of the fan 20 in the air flow direction. The lower part of the humidification filter 53 is immersed in the water of the water storage tank 52. The water is absorbed by the part of the humidification filter 53 immersed in the water storage tank 52 and is retained therein.

[0191] The humidification filter 53 is supported so as to be rotatable around a rotating shaft 54. The rotating shaft 54 ​​is arranged across a pair of support legs 55. The base end of the support leg 55 is fixed to the water storage tank 52, for example. The humidification filter 53 is rotated around the rotating shaft 54 ​​by a rotating mechanism such as a motor not shown. By rotating the humidification filter 53 while passing air through the humidification filter 53, water absorbed by the humidification filter 53 is released into the suction side flow path 13. The air containing moisture is sucked into the suction port 21 of the fan 20 and blown out to the outside of the frame 10 from the blowing port 22. In this way, the air can be humidified.

[0192] A plurality of silencers 30 are arranged inside the frame 10. Fig.25 and Fig.26 In the example shown, two silencers 30 are provided. The silencers 30 are arranged at positions that do not interfere with the humidifying device 50. Fig. 27 and Fig.28 The structure of the silencer 30 will be described.

[0193] exist Fig.28 In the embodiment, the muffler 30 on the left is arranged closer to the fan 20. Fig.28 The left silencer 30 has a transmission path 31 extending in the up-down direction. Fig.28 The paper depth side ( Fig. 27 An opening 32 is provided on the right side of Fig.28 In FIG. 1 , the left muffler 30 is provided with a closing portion 33 on the upper side.

[0194] exist Fig.28 In the embodiment, the right muffler 30 is arranged closer to the fan 20. Fig.28 The right silencer 30 has a transmission path 31 extending in the up-down direction. Fig.28 The paper depth side ( Fig. 27 An opening 32 is provided on the right side of Fig.28 In FIG. 1 , the right muffler 30 is provided with a closing portion 33 on the upper side.

[0195] A branch port 23 is provided between the air inlet 21 and the air outlet 22 of the fan 20. Fig.28 In the embodiment, the branch port 23 is communicated with the opening 32 of the right muffler 30 . The sound generated on the outlet side of the fan 20 enters the opening 32 of the muffler 30 through the branch port 23 .

[0196] -Effects of the Tenth Embodiment-

[0197] According to the features of this embodiment, the noise reduction effect can be further improved by providing a plurality of silencers 30. In addition, by arranging the silencers 30 on the outlet side of the fan 20, the sound generated on the outlet side of the fan 20 can be reduced.

[0198] - Industrial Applicability -

[0199] In summary, the present disclosure is useful for air conditioning devices and air purifiers.

[0200] - Explanation of symbols -

[0201] 1. Air conditioning device (air purifier)

[0202] 10 Frame

[0203] 12 Inhalation openings

[0204] 13 Suction side flow path

[0205] 20 fan

[0206] 21 suction port

[0207] 30 Silencer

[0208] 31 Transmission channels

[0209] 32 opening

[0210] 33 Closed section

[0211] 35 partition

[0212] 35a communication port

[0213] 36 Anechoic Chamber

[0214] 37 Fan Room

Claims

1. An air conditioning device, comprising a frame (10) and a fan (20) arranged inside the frame (10), characterized in that: A suction side flow path (13) is provided between the suction opening (12) of the frame (10) and the suction port (21) of the fan (20). The air conditioning device includes a cylindrical silencer (30), wherein the silencer (30) has a propagation path (31) for propagating sound. The silencer (30) has an opening portion (32) and a closing portion (33), wherein the opening portion (32) opens at one end of the propagation path (31) and is connected to the suction side flow path (13), and the closing portion (33) seals the other end of the propagation path (31) and reflects the sound passing through the propagation path (31) toward the opening portion (32).

2. The air conditioning device according to claim 1, characterized in that: When the propagation direction of sound in the suction side flow path (13) is set to a first direction and the direction orthogonal to the first direction is set to a second direction, the average length of the opening portion (32) of the silencer (30) in the second direction is longer than the average length of the opening portion (32) of the silencer (30) in the first direction.

3. The air conditioning device according to claim 1 or 2, characterized in that: The sound generated in the suction-side flow path (13) is caused by the rotation of the fan (20).

4. The air conditioning device according to claim 1 or 2, characterized in that: The sound generated in the suction side flow path (13) is caused by a resonance sound based on the shape of the frame (10).

5. The air conditioning device according to any one of claims 1 to 4, characterized in that: When the cross-sectional area of ​​the opening (32) of the muffler (30) is set to S and the cross-sectional area of ​​the suction side flow path (13) in a direction perpendicular to the axial direction of the fan (20) is set to S0, the condition of 0.02<S / S0 is satisfied.

6. The air conditioning device according to claim 5, characterized in that: The condition of S / S0<0.05 is satisfied.

7. The air conditioning device according to any one of claims 1 to 6, characterized in that: A muffler chamber (36) is arranged in the suction side flow path (13). The opening (32) of the muffler (30) is in communication with the muffler chamber (36). When the cross-sectional area of ​​the muffler chamber (36) in a direction perpendicular to the axial direction of the fan (20) is set to S0, the cross-sectional area of ​​the suction port (21) of the fan (20) is set to S1, and the cross-sectional area of ​​the suction opening (12) of the frame (10) is set to S2, the conditions of S1<S0, S2<S0 are satisfied. The volume of the muffler (30) is smaller than the volume of the muffler chamber (36).

8. The air conditioning device according to claim 7, characterized in that: The air conditioning device comprises a partition (35), wherein the partition (35) divides the interior of the frame (10) into a fan chamber (37) and a muffler chamber (36), wherein the fan (20) is arranged in the fan chamber (37), and the muffler chamber (36) propagates sound to an upstream side that is further upstream than the fan chamber (37) in the air flow direction. The partition plate (35) is formed with a communication port (35a) that communicates with the suction port (21) of the fan (20).

9. The air conditioning device according to claim 7, characterized in that: The muffler (30) reduces resonance sound that depends on the volume of the suction side flow path (13).

10. The air conditioning device according to any one of claims 1 to 9, characterized in that: The opening (32) of the muffler (30) opens in the same direction as the propagation direction of sound in the suction-side flow path (13).

11. The air conditioning device according to any one of claims 1 to 9, characterized in that: The opening portion (32) of the silencer (30) is arranged along the outer peripheral edge of the suction port (21) when viewed from the axial direction of the fan (20).

12. The air conditioning device according to any one of claims 1 to 11, characterized in that: A plurality of the silencers (30) are provided.

13. The air conditioning device according to any one of claims 1 to 12, characterized in that: The silencer (30) has a bent portion (34) formed by bending a portion of the propagation path (31).

14. The air conditioning device according to any one of claims 1 to 13, characterized in that: The length of the propagation path (31) of the silencer (30) is set according to the frequency of the sound.

15. An air purifier, characterized in that: The air purifier comprises the air conditioning device (1) according to any one of claims 1 to 14.

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