Air conditioner

Abstract

An object of the present disclosure is to provide an arrangement and structure of a muffler that helps improve the muffling effect of the muffler. In an air conditioner (1) that supplies outdoor air from an outdoor unit (3) to an indoor unit (2), an air supply and exhaust fan (43), a first duct (61), and a muffler (70) are provided. The air supplied by the air supply and exhaust fan (43) passes through the first duct (61). The muffler (70) reduces the sound propagating in the first duct (61) while being connected to the first duct (61). A part of the muffler (70) is arranged inside the outdoor unit (3). Since the muffler (70) is connected to the first duct (61) inside the outdoor unit (3) close to the sound source, the muffling effect is improved.

Description

Technical Field

[0001] The present invention relates to an air conditioner that conveys air between an outdoor unit and an indoor unit. Background Art

[0002] In recent years, air conditioners that supply outdoor air from an outdoor unit to an indoor unit via a cylindrical air passage have been widely popularized. For example, the air conditioner described in Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2004-69173) can perform air conditioning such as humidification or ventilation by conveying outdoor air into the room.

[0003] In such an air conditioner, there is a case where the sound of the fan that supplies air propagates in the air conveyance path and leaks into the room. Therefore, a silencer is provided in the air passage through which the air supplied to the indoor unit passes. Summary of the Invention

[0004] Problems to be Solved by the Invention

[0005] However, even if a silencer is provided in the air passage, the longer the distance between the sound source and the silencer, the lower the sound attenuation effect. Therefore, there is a problem that a configuration and structure of a silencer that helps to improve the sound attenuation effect of the silencer are required.

[0006] Means for Solving the Problems

[0007] An air conditioner according to a first aspect is an air conditioner that supplies outdoor air from an outdoor unit to an indoor unit, and includes a fan, an air passage, and a silencer. The air supplied by the fan passes through the air passage. The silencer reduces the sound propagating in the air passage while being connected to the air passage. A part of the silencer is disposed inside the outdoor unit.

[0008] In this air conditioner, the silencer is connected to the air passage inside the outdoor unit near the sound source, so that the sound attenuation effect is improved.

[0009] An air conditioner according to a second aspect is, based on the air conditioner according to the first aspect, the silencer includes a first sound attenuation portion and a second sound attenuation portion. The first sound attenuation portion is disposed inside the outdoor unit. The second sound attenuation portion is disposed outside the outdoor unit.

[0010] In this air conditioner, the silencer is connected to the air passage inside the outdoor unit near the sound source, and the volume is also increased by the first sound attenuation portion and the second sound attenuation portion, so that the sound attenuation effect is further improved.

[0011] An air conditioner according to a third aspect is, based on the air conditioner according to the second aspect, the silencer further includes a pipe that connects the first sound attenuation portion and the second sound attenuation portion. The pipe has a first end connected to the first sound attenuation portion and a second end connected to the second sound attenuation portion. The first end and the second end are offset in the horizontal direction.

[0012] In this air conditioner, since the first sound-absorbing part and the second sound-absorbing part of the muffler are separated and connected by a pipe, the degree of freedom in selecting the positions of the first sound-absorbing part and the second sound-absorbing part is greater than that in the structure where the first sound-absorbing part and the second sound-absorbing part are integrated.

[0013] For example, in the case of an integrated type, when the position of the first sound-absorbing part changes, the position of the second sound-absorbing part will necessarily change. In the case of a separated type, even if the position of the first sound-absorbing part changes, if the pipe is changed, the position of the second sound-absorbing part can remain unchanged. Or, the pipe can be changed so as to change only the position of the second sound-absorbing part without changing the position of the first sound-absorbing part.

[0014] The air conditioner of the fourth aspect is based on the air conditioner of the third aspect, and the cross-section of the pipe orthogonal to the air flow direction is smaller than that of the first sound-absorbing part and the second sound-absorbing part. The pipe penetrates the side surface of the outdoor unit.

[0015] In this air conditioner, it is only necessary to provide a hole on the side surface of the outdoor unit that allows the pipe to penetrate. Therefore, compared with the case where the first sound-absorbing part and the second sound-absorbing part are integrated, the simplification of the side surface shape of the outdoor unit can be achieved.

[0016] The air conditioner of the fifth aspect is based on the air conditioner of the third aspect or the fourth aspect, and the pipe has a bent portion on the path from the first end to the second end.

[0017] In this air conditioner, by making the pipe have a bent portion, the selection of the positions of the first sound-absorbing part and the second sound-absorbing part becomes easier compared with the structure in which the path from the first sound-absorbing part to the second sound-absorbing part is straight.

[0018] For example, even when it is desired to move the position of the second sound-absorbing part, it can be adjusted by the degree of bending of the pipe, so there is no need to redesign the overall shape of the muffler.

[0019] The air conditioner of the sixth aspect is based on the air conditioner of the third aspect or the fourth aspect, and for the pipe, the cross-section orthogonal to the air flow direction becomes smaller as it gets closer to the second end.

[0020] The air conditioner of the seventh aspect is based on the air conditioner described in any one of the second aspect to the sixth aspect. The interior of the outdoor unit is partitioned into a first chamber where a compressor serving as a heat source is arranged, and a second chamber adjacent to the first chamber. A part of the first sound-absorbing part is accommodated in the first chamber. In this air conditioner, the internal condensation of the first sound-absorbing part is suppressed by the heat of the compressor.

[0021] The air conditioner according to the eighth aspect is configured such that, based on the air conditioner according to the second aspect, the first sound absorption part is arranged so as to straddle the side surface of the outdoor unit. In this air conditioner, since the volume of the first sound absorption part is increased, the sound absorption effect is improved.

[0022] The air conditioner according to the ninth aspect is configured such that, based on the air conditioner according to any one of the second to eighth aspects, the volume of the first sound absorption part is larger than the volume of the second sound absorption part. In this air conditioner, by increasing the volume of the first sound absorption part closer to the sound source, the sound absorption effect is thus improved.

[0023] The air conditioner according to the tenth aspect is configured such that, based on the air conditioner according to the first or second aspect, a communication part through which a part of the silencer passes is formed on the side surface of the outdoor unit. The silencer has a flange that covers the gap between the silencer and the communication part.

[0024] In this air conditioner, since the flange covers the gap between the silencer and the communication part, even if a flame should happen to spread through this gap, the flange will function as a fireproof wall. Description of the Drawings

[0025] Figure 1 is an external view of the air conditioner according to the first embodiment.

[0026] Figure 2 is a system diagram of the refrigerant circuit used in the air conditioner.

[0027] Figure 3 is an exploded perspective view showing the structure of the outdoor unit.

[0028] Figure 4 is a schematic structural diagram of the humidifying unit.

[0029] Figure 5 is a diagram schematically showing the air flow flowing in the moisture absorption rotor.

[0030] Figure 6A is a partial front view of the outdoor unit of the air conditioner according to the first embodiment.

[0031] Figure 6B is Figure 6A the right side view of the outdoor unit described.

[0032] Figure 7 is an external perspective view of the silencer.

[0033] Figure 8 is a longitudinal sectional view of the silencer.

[0034] Figure 9 is an external perspective view of the silencer of the modified example.

[0035] Figure 10A It is a partial front view of the outdoor unit of the air conditioner according to the second embodiment.

[0036] Figure 10B It is Figure 10A the right side view of the outdoor unit described.

[0037] Figure 11 It is a three-dimensional external view of the silencer.

[0038] Figure 12 It is a longitudinal sectional view of the silencer.

[0039] Figure 13 It is a three-dimensional external view of the silencer of the modified example. Detailed implementation manners

[0040] <The first embodiment>

[0041] (1) Schematic structure of the air conditioner 1

[0042] Figure 1 It is an external view of the air conditioner 1 according to the first embodiment. In Figure 1 it, the air conditioner 1 includes an indoor unit 2 and an outdoor unit 3. The indoor unit 2 is installed on an indoor wall surface or the like, and the outdoor unit 3 is provided outdoors.

[0043] Figure 2 It is a system diagram of the refrigerant circuit used in the air conditioner 1, and for the sake of easy explanation, the outline of the air flow is added. In Figure 2 it, the indoor unit 2 has an indoor heat exchanger 11, and the outdoor unit 3 has an outdoor heat exchanger 24. Each heat exchanger and the refrigerant pipes 31, 32 connecting these heat exchangers constitute the refrigerant circuit. <L

[0044] (1-1) Indoor unit 2

[0045] The indoor heat exchanger 11 of the indoor unit 2 has heat transfer pipes and a plurality of fins. The heat transfer pipes are folded back many times at both ends in the length direction. The heat transfer pipes are inserted through the fins. The indoor heat exchanger 11 performs heat exchange with the air in contact therewith.

[0046] In addition, the indoor unit 2 also has a cross-flow fan 12 and an indoor fan motor 13 that drives the cross-flow fan

[0046] 12 to rotate. The cross-flow fan 12 is configured in a cylindrical shape, and a plurality of blades are provided on the circumferential surface. The cross-flow fan 12 generates an air flow in a direction intersecting the rotation axis. The cross-flow fan 12 sucks indoor air into the interior of the indoor unit 2 and blows out the air that has undergone heat exchange with the indoor heat exchanger 11 into the room.

[0047] (1-2) Outdoor unit 3

[0048] The outdoor unit 3 has an air-conditioning outdoor unit 5, a humidifying unit 4, and a supply and exhaust path including a muffler 70. A supply and exhaust hose 6 is provided between the outdoor unit 3 and the indoor unit 2. The supply and exhaust hose 6 is used when supplying outdoor air or humidified air from the humidifying unit 4 to the indoor unit 2 side, and when exhausting indoor air to the outside.

[0049] The supply and exhaust hose 6 is connected to a first pipe 61 provided inside the outdoor unit 3 (refer to Figure 2 ), a muffler 70 disposed on the side surface of the outdoor unit 3 so as to straddle the inside and outside of the outdoor unit 3, and a second pipe 62 connecting the muffler 70 and the supply and exhaust hose 6 to form a supply and exhaust path through which air passes.

[0050] Here, the inside of the outdoor unit 3 refers to the space on the mechanical chamber 50a side beyond the right side plate 52 with the right side plate 52 as the boundary.

[0051] As Figure 1 and Figure 2 shown, the muffler 70 is disposed on the side surface of the outdoor unit 3 in a state of being connected to the first pipe 61. The muffler 70 reduces the sound propagating in the first pipe 61, or the sound propagating in the supply and exhaust hose 6 and the second pipe 62.

[0052] (2) Structure of the air-conditioning outdoor unit 5

[0053] Figure 3 is an exploded perspective view showing the structure of the outdoor unit 3. In Figure 1 and Figure 3 , the air-conditioning outdoor unit 5 has refrigerant circuit components and a housing 50 that houses the refrigerant circuit components.

[0054] (2-1) Housing 50

[0055] The housing 50 is formed by a front surface panel 51, a right side plate 52, a left side plate 53, and a metal bottom plate 54.

[0056] The front surface panel 51 is a resin component that covers the front surface of the air-conditioning outdoor unit 5. The front surface panel 51 is disposed at a position downstream of the outdoor heat exchanger 24 in the air flow direction passing through the outdoor heat exchanger 24. The front surface panel 51 has a blowout port 51a. The blowout port 51a is a plurality of slit-shaped openings. The air that has passed through the outdoor heat exchanger 24 is blown out from the inside of the air-conditioning outdoor unit 5 to the outside of the outdoor unit 3 through the blowout port 51a. In addition, a first bellmouth 56 and a partition plate 57 are installed behind the front surface panel 51.

[0057] The partition plate 57 divides the interior of the housing 50 into two parts: a machinery chamber 50a where the compressor 21 is disposed, and a blower chamber 50b where the propeller fan 29 is disposed.

[0058] The right side plate 52 and the left side plate 53 are metal components that cover the sides of the air conditioner outdoor unit 5. Here, the right side plate 52 is disposed on the right side when the outdoor unit 3 is viewed from the front. The left side plate 53 is disposed on the left side when the outdoor unit 3 is viewed from the front.

[0059] The right side plate 52 and the left side plate 53 are arranged substantially parallel to the blowing direction of the blown air from the blowout port 51a. In addition, a cover 55 is installed on the right side plate 52. The cover 55 protects the liquid shut-off valve 27 and the gas shut-off valve 28.

[0060] (2-2) Refrigerant Circuit Components

[0061] The housing 50 houses the compressor 21, the four-way switching valve 22, the accumulator 23, the outdoor heat exchanger 24, and the electric valve 25 as refrigerant circuit components (see Figure 2 ). The compressor 21, the four-way switching valve 22, the accumulator 23, and the electric valve 25 are disposed in the machinery chamber 50a between the partition plate 57 and the right side plate 52.

[0062] As Figure 2 shown, the four-way switching valve 22 is connected to the discharge side of the compressor 21. The accumulator 23 is connected to the suction side of the compressor 21.

[0063] The outdoor heat exchanger 24 has a substantially L-shaped configuration when viewed from above. The outdoor heat exchanger 24 is disposed in front of a protective metal net (not shown) that covers the back surface of the air conditioner outdoor unit 5.

[0064] One end of the electric valve 25 is connected to the outdoor heat exchanger 24, and the other end of the electric valve 25 is connected to one end of the indoor heat exchanger 11 via the filter 26, the liquid shut-off valve 27, and the refrigerant pipe 32.

[0065] In addition, the four-way switching valve 22 is connected to the other end of the indoor heat exchanger 11 via the gas shut-off valve 28 and the refrigerant pipe 31. These refrigerant pipes 31, 32 and the supply and exhaust hose 6 together form a collective connecting pipe 7.

[0066] The air conditioner outdoor unit 5 also has a propeller fan 29. The propeller fan 29 is disposed in the blower chamber 50b between the partition plate 57 and the left side plate 53 in front of the outdoor heat exchanger 24. The propeller fan 29 is rotationally driven by the outdoor fan motor 30. The propeller fan 29 discharges the air taken into the interior of the air conditioner outdoor unit 5 forward of the front surface panel 51 after contacting the outdoor heat exchanger 24 from the blowout port 51a.

[0067] As shown Figure 3 in the figure, the outdoor unit 5 of the air conditioner also has an electrical component unit 58. The electrical component unit 58 is arranged at the upper part of the outdoor unit 5 of the air conditioner. The electrical component unit 58 has an electrical component box and a printed circuit board on which a CPU 91 (refer to Figure 2 ) for controlling each part is mounted. A fireproof board 59 is installed above the electrical component unit 58.

[0068] (3) Structure of the humidifying unit 4

[0069] The humidifying unit 4 has a humidifying function, a supply air function, and an exhaust function. As shown Figure 3 in the figure, the humidifying unit 4 includes a housing 40, a moisture absorption rotor 41, a heater 42, a supply and exhaust fan 43, a switching damper 44, an adsorption pipe 45, an adsorption fan 46, a rotor drive motor 47, a rotor drive gear 48, and a heater support plate 49.

[0070] (3-1) Housing 40

[0071] The housing 40 covers the front, rear, and both side surfaces of the humidifying unit 4. The upper part of the housing 40 is covered by a top plate 66.

[0072] The housing 40 is configured to be connected to the upper part of the outdoor unit 5 of the air conditioner. The housing 40 has an adsorption air outlet 40a on its front surface. The adsorption air outlet 40a is a plurality of slit-shaped openings. Air is blown out to the outside of the outdoor unit 3 through the adsorption air outlet 40a.

[0073] In addition, an adsorption air inlet 40b and a supply and exhaust air outlet 40c are arranged side by side in the left-right direction on the back surface of the housing 40. When viewed from the front surface side, the adsorption air inlet 40b is arranged on the left side, and the supply and exhaust air outlet 40c is arranged on the right side.

[0074] Outdoor air is taken in through the adsorption air inlet 40b and guided to the moisture absorption rotor 41. Moisture contained in the outdoor air is adsorbed by the moisture absorption rotor 41. The supply and exhaust air outlet 40c allows air to pass through for being transported toward the indoor unit 2 or for being discharged from the indoor unit 2 to the outside.

[0075] The housing 40 has two spaces inside, left and right. The moisture absorption rotor 41 and the like are stored in the space on the right side, and the adsorption fan 46 and the like are stored in the space on the left side. The space on the left side is called the adsorption fan storage space SP1.

[0076] The moisture absorption rotor 41, the heater 42, the supply and exhaust fan 43, the switching damper 44, the adsorption pipe 45, and the adsorption fan 46 are arranged in the housing 40.

[0077] (3-2) Moisture absorption rotor 41

[0078] The moisture absorption rotor 41 is a ceramic rotor with a honeycomb structure in the shape of a circular plate, and air can easily pass through the moisture absorption rotor 41. The moisture absorption rotor 41 has a plurality of polygonal cylinder portions in a cross-section cut perpendicular to the rotation axis, and air passes through these cylinder portions.

[0079] The main part of the moisture absorption rotor 41 is fired from an adsorbent such as zeolite, silica gel, or alumina. Adsorbents such as zeolite have the property of adsorbing moisture in the air they come into contact with and releasing the adsorbed moisture when heated.

[0080] The moisture absorption rotor 41 is supported rotatably on a support shaft 40d provided on the housing 40 side. A gear is formed on the circumferential surface of the moisture absorption rotor 41, and this gear meshes with a rotor drive gear 48 mounted on the drive shaft of a rotor drive motor 47.

[0081] (3 - 3) Heater 42

[0082] The heater 42 is arranged so as to cover approximately half (the right - hand half) of the upper surface of the moisture absorption rotor 41. An air inlet and an air outlet are formed on the lower surface of the heater 42. Air is inhaled from the air inlet. The air heated by the heater 42 is discharged from the air outlet toward the moisture absorption rotor 41 side. The heater 42 is mounted above the moisture absorption rotor 41 via a heater support plate 49.

[0083] (3 - 4) Supply - exhaust fan 43

[0084] The supply - exhaust fan 43 is arranged on the side of the moisture absorption rotor 41. The supply - exhaust fan 43 conveys the air taken in from the outside to the indoor unit 2, or discharges the air taken in from the indoor unit 2 to the outside.

[0085] The supply - exhaust fan 43 switches between the supply operation and the exhaust operation by switching a switching damper 44. When the supply - exhaust fan 43 conveys outside air to the indoor unit 2, it sends the air that has dropped from a specified part of the moisture absorption rotor 41 through the moisture absorption rotor 41 to the first duct 61 (refer to Figure 2 ) for delivery.

[0086] As Figure 2 shown, the supply - exhaust fan 43 and the indoor unit 2 are connected by a supply - exhaust path composed of a first duct 61, a silencer 70, a second duct 62, and a supply - exhaust hose 6. The supply - exhaust fan 43 supplies air to the indoor unit 2 via this supply - exhaust path.

[0087] When the supply - exhaust fan 43 discharges indoor air to the outside, it discharges the air sent from the first duct 61 to the outside through a supply - exhaust port 40c provided on the back surface of the housing 40.

[0088] (3-5) Switching air damper 44

[0089] The switching air damper 44 is a rotary air flow path switching unit disposed below the air supply and exhaust fan 43, which switches between a first state and a second state.

[0090] In the first state, the air blown out from the air supply and exhaust fan 43 is supplied to the indoor unit 2 through the above-mentioned air supply and exhaust path. Thus, in the first state, the air flows in the direction of the arrow shown by the solid line arrow A1 in Figure 2 , and the humidified air or outdoor air is supplied to the indoor unit 2.

[0091] In the second state, the air flows in the direction of the arrow shown by the dashed line arrow A2 in Figure 2 , and the air from the indoor unit 2 is discharged to the outside through the air supply and exhaust fan 43 via the air supply and exhaust port 40c.

[0092] (3-6) Adsorption pipe 45

[0093] The adsorption pipe 45 covers the part of the upper surface of the moisture absorption rotor 41 where the heater 42 is not located. The adsorption pipe 45 and the second bell mouth 63 together form an air flow path leading from the upper surface of the left half of the moisture absorption rotor 41 to the upper part of the adsorption fan accommodation space SP1.

[0094] (3-7) Adsorption fan 46

[0095] The adsorption fan 46 is disposed in the adsorption fan accommodation space SP1. The adsorption fan 46 is a centrifugal fan. The adsorption fan 46 is rotated by the adsorption fan motor 65. The adsorption fan 46 sucks air from the opening 63a of the second bell mouth 63 disposed in the upper part, and generates an air flow flowing from the adsorption suction port 40b through the moisture absorption rotor 41 to the opening 63a.

[0096] The adsorption fan 46 discharges the dry air adsorbed with moisture when passing through the moisture absorption rotor 41 from the adsorption blowout port 40a toward the front of the housing 40. The second bell mouth 63 is disposed in the upper part of the adsorption fan accommodation space SP1, and guides the air coming through the adsorption pipe 45 to the adsorption fan 46.

[0097] (4) Operation of the humidifying unit 4

[0098] Figure 4 is a schematic structural diagram of the humidifying unit 4. In addition, Figure 5 is a diagram schematically showing the air flow flowing in the moisture absorption rotor 41. In Figure 4 and Figure 5In order to facilitate the description, the air passage from the suction inlet 40b for adsorption to the adsorption fan 46 is referred to as the moisture absorption passage X, the air passage from the air supply and exhaust port 40c to the heater 42 is referred to as the heat collection passage Y, and the air passage from the heater 42 to the air supply and exhaust fan 43 is referred to as the humidification passage Z.

[0099] (4-1) Humidification operation

[0100] The humidifying unit 4 takes in outdoor air from the adsorption suction port 40b into the moisture absorption passage X by operating the adsorption fan 46. The air Ax flowing in the moisture absorption passage X passes through the first region Rx of the moisture absorption rotor 41 facing the moisture absorption passage X, and in this first region Rx, the moisture in the air Ax is absorbed.

[0101] The air Ax passes through the adsorption fan 46, and is discharged from the adsorption fan accommodation space SP1 through the adsorption blowout port 40a to the front of the outdoor unit 3.

[0102] In addition, the humidifying unit 4 takes in outdoor air from the air supply and exhaust port 40c into the heat collection passage Y by rotating the air supply and exhaust fan 43. The air Ay flowing in the heat collection passage Y is heated by the heater 42 after passing through the second region Ry of the moisture absorption rotor 41 facing the heat collection passage Y. The air Ay is heated by the heater 42 to become high-temperature air Az and flows into the humidification passage Z. The high-temperature air Az flows into the first pipe 61 through the third region Rz of the moisture absorption rotor 41 facing the humidification passage Z.

[0103] The air Ay flowing in the heat collection passage Y recovers heat from the second region Ry and rises in temperature when passing through the second region Ry of the moisture absorption rotor 41, and then is further heated by the heater 42 to become high-temperature air Az. The high-temperature air Az flowing in the humidification passage Z absorbs moisture from the third region Rz when passing through the third region Rz of the moisture absorption rotor 41.

[0104] As Figure 5 shown, the moisture absorption rotor 41 rotates in the direction shown by the arrow D and sequentially passes through the moisture absorption passage X, the humidification passage Z, and the heat collection passage Y. As a result, in the moisture absorption rotor 41, the first region Rx of the moisture absorption rotor 41 facing the moisture absorption passage X, the third region Rz of the moisture absorption rotor 41 facing the humidification passage Z, and the second region Ry of the moisture absorption rotor 41 facing the heat collection passage Y sequentially move over.

[0105] The moisture adsorbed by the moisture absorption rotor 41 from the air Ax in the moisture absorption passage X is released by the high-temperature air Az heated by the heater 42, and the high-temperature air Az is humidified.

[0106] The air supply and exhaust fan 43 conveys the air passing through the moisture absorption rotor 41 to the indoor unit 2 via the air supply and exhaust path. The air conveyed to the indoor unit 2 contains the moisture adsorbed on the moisture absorption rotor 41.

[0107] The air supplied from the humidifying unit 4 to the indoor unit 2 in this way is blown into the room via the indoor heat exchanger 11.

[0108] (4-2) Ventilation operation

[0109] The air conditioner 1 can also perform only the air supply of taking in the outdoor air and conveying it to the indoor unit without performing humidification by not operating the adsorption fan motor 65 or the heater 42. In addition, the air conditioner 1 can also perform only the exhaust of conveying the indoor air to the outside.

[0110] (5) Details of the air supply and exhaust path including the silencer 70

[0111] The air supply and exhaust path is composed of the first duct 61, the silencer 70, the second duct 62, and the air supply and exhaust hose 6. The humidifying unit 4 and the indoor unit 2 are connected by the air supply and exhaust path, and the air supply and exhaust fan 43 supplies air to the indoor unit 2 via this air supply and exhaust path.

[0112] Figure 6A It is a partial front view of the outdoor unit 3 of the air conditioner 1 of the first embodiment. In addition, Figure 6B is Figure 6A the right side view of the outdoor unit 3 described in

[0113] In Figure 6A and Figure 6B , for the sake of convenience of explanation, the cover 55 is represented by a phantom line (double-dot chain line), and the right side plate 52 can be seen through the cover 55. In addition, for Figure 6A the outdoor unit 3 described in

[0114] In addition, regarding the "directions" used in the description, follow Figure 6A the directions marked by the arrows of the four directions of "up", "down", "left", and "right", and Figure 6B the directions marked by the arrows of the four directions of "up", "down", "front", and "back".

[0115] (5-1) The first duct 61

[0116] The first duct 61 is a cylindrical air passage for the air supplied by the air supply and exhaust fan 43 to flow. The first duct 61 is located inside the outdoor unit 3 and is connected to the switching damper 44 disposed below the air supply and exhaust fan 43. The silencer 70 is connected to the terminal of the first duct 61.

[0117] (5-2)Silencer 70

[0118] When supplying outdoor air from the outdoor unit 3 to the indoor unit 2, the silencer 70 reduces the sound propagating in the first duct 61. In addition, when exhausting air from the indoor unit 2 to the outdoor unit 3, the silencer 70 reduces the sound propagating in the second duct 62.

[0119] Figure 7 is a perspective view of the exterior of the silencer 70. In Figure 7 , the silencer 70 can be divided into a first sound-absorbing portion 71 and a second sound-absorbing portion 72.

[0120] Regarding the first sound-absorbing portion 71, its volume is larger than that of the second sound-absorbing portion 72, and a part of it is arranged in the mechanical chamber 50a inside the outdoor unit 3, and the remaining part penetrates the right side plate 52 and is housed between the right side plate 52 and the cover 55 (refer to Figure 6A ).

[0121] Since a part of the first sound-absorbing portion 71 is housed in the mechanical chamber 50a, condensation inside the first sound-absorbing portion 71 is suppressed by the heat of the compressor 21.

[0122] The second sound-absorbing portion 72 is continuously connected to the part of the first sound-absorbing portion 71 housed between the right side plate 52 and the cover 55. The second sound-absorbing portion 72 is also housed between the right side plate 52 and the cover 55.

[0123] In the silencer 70, as Figure 6A and Figure 6B shown, the first connection portion 711, which is the upper end of the first sound-absorbing portion 71, is connected to the terminal of the first duct 61 extending from the humidifying unit 4 inside the outdoor unit 3. After the first sound-absorbing portion 71 penetrates the right side plate 52 of the outdoor unit 3, it is seamlessly connected to the second sound-absorbing portion 72. The second sound-absorbing portion 72 extends vertically downward to reach the second connection portion 722, which is the lower end.

[0124] [[ID=3o]]The silencer 70 has a larger volume by including the first sound-absorbing portion 71 and the second sound-absorbing portion 72, and the volume of the first sound-absorbing portion 71 connected to the vicinity of the sound source is larger than that of the second sound-absorbing portion 72, so the sound-absorbing effect is improved. However, it is not limited to this, and there may also be a case where the volume of the second sound-absorbing portion 72 is larger than that of the first sound-absorbing portion 71.

[0125] The silencer 70 has: a silencer main body 700, which constitutes the main body of the first sound-absorbing portion 71 and the second sound-absorbing portion 72; a first connection portion 711, which is connected to the first duct 61; and a second connection portion 722, which is connected to the second duct 62.

[0126] (5-2-1)Silencer main body 700

[0127] Figure 8 is a longitudinal sectional view of the muffler 70. In Figure 8 , the muffler main body 700 has an outer shell 700a as a housing. The muffler main body 700 also has a sound-absorbing material 700b and a cavity 700c surrounded by the sound-absorbing material 700b inside the outer shell 700a.

[0128] As the raw material of the sound-absorbing material 700b, felt, foamed polyurethane, etc. can be used. Since the cavity 700c is connected to the first duct 61, the air delivered to the indoor unit 2 or the air delivered from the indoor unit 2 passes through the cavity 700c.

[0129] In the air-conditioning apparatus 1, the sound generated by the air supply and exhaust fan 43 is reduced by the muffler 70 connected to the first duct 61 of the outdoor unit 3 before being delivered to the indoor unit 2. Therefore, in this air-conditioning apparatus 1, the sound transmitted from the outdoor unit 3 to the indoor unit 2 becomes smaller.

[0130] The first connection portion 711 protrudes vertically upward from the top plate 700d of the outer shell 700a. In addition, the second connection portion 722 protrudes vertically downward from the bottom plate 700e of the outer shell 700a.

[0131] (5-2-2) The first connection portion 711

[0132] As Figure 7 shown, the first connection portion 711 has a cylindrical shape. A protrusion 711a and a slit 711b are provided on the first connection portion 711. The protrusion 711a is rectangular and protrudes radially from the outer peripheral surface. The slit 711b is recessed vertically downward from the upper end surface of the first connection portion 711.

[0133] A concave portion (not shown) that fits with the protrusion 711a and a convex portion (not shown) that fits with the slit 711b are provided on the first duct 61 connected to the first connection portion 711, and the protrusion 711a and the slit 711b function as components for "positioning" and "anti-rotation".

[0134] (5-2-3) The second connection portion 722

[0135] As Figure 7 shown, the second connection portion 722 has a cylindrical shape. In addition, as Figure 6A and Figure 6B shown, the second connection portion 722 is located above the liquid shut-off valve 27 and the gas shut-off valve 28.

[0136] In addition, the first connection portion 711 and the second connection portion 722 not only have a height difference from the top plate 700d to the bottom plate 700e, but also the central axis C2 of the second connection portion 722 is offset to the right direction from the central axis C1 of the first connection portion 711.

[0137] According to the above structure, in the muffler 70, the internal path from the first connection part 711 to the second connection part 722 is shaped such that it slopes downward toward the second connection part 722 and then extends vertically downward. As a result, the internal path from the first connection part 711 to the second connection part 722 is longer than that of a conventional muffler having an internal path that simply extends vertically downward. Therefore, the volume of the muffler main body 700 increases, and the muffling effect is improved.

[0138] (5-3) Second duct 62

[0139] As Figure 6B shown, the second duct 62 is a cylindrical air passage and is connected to the second connection part 722 of the muffler 70. The second duct 62 further guides the air flowing into the muffler 70 from the first duct 61 downstream.

[0140] In addition, the second connection part 722 separates upward from the liquid shut-off valve 27 and the gas shut-off valve 28 along the right side plate 52 of the outdoor unit 3. Therefore, a space for arranging the second duct 62 is ensured between the second connection part 722 and the liquid shut-off valve 27 and the gas shut-off valve 28.

[0141] In addition, the second duct 62 has a bent part 62a. The bent part 62a bends along the right side plate 52 of the outdoor unit 3 toward the back side of the outdoor unit 3.

[0142] More specifically, in the outdoor unit 3, the side where the front surface panel 51 (refer to Figure 3 ) is arranged is defined as the "front surface side", and the side where the long-sized part of the substantially L-shaped outdoor heat exchanger 24 (refer to Figure 3 ) is arranged is defined as the "back side". The second duct 62 bends along the right side plate 52 of the outdoor unit 3 toward the back side through the bent part 62a.

[0143] Therefore, the air supply and exhaust path can be configured such that the second duct 62 is turned back toward the back side of the outdoor unit 3 at the downstream side of the muffler 70 through the bent part 62a.

[0144] In the present embodiment, the direction in which the second duct 62 extends from the bent part 62a is along the direction in which the refrigerant pipes 31, 32 extend.

[0145] (5-4) Air supply and exhaust hose 6

[0146] The air supply and exhaust hose 6 is connected to the second duct 62 and can convey air between the outdoor unit 3 and the indoor unit 2. When supplying outdoor air from the outdoor unit 3, the air supply and exhaust hose 6 guides the outdoor air to the indoor unit 2. In addition, when exhausting air from the indoor unit 2 to the outdoor unit 3, the air supply and exhaust hose 6 guides the air to the outdoor unit 3.

[0147] In the present embodiment, the second pipe 62 and the air supply and exhaust hose 6 are separately provided, but the second pipe 62 and the air supply and exhaust hose 6 may be integrally formed.

[0148] As described above, through the bent portion 62a of the second pipe 62, the air supply and exhaust path has a structure in which the second pipe 62 turns back toward the back side of the outdoor unit 3 on the downstream side of the muffler 70. Therefore, it is easy to align the second pipe 62 along the refrigerant pipes 31 and 32 connected to the liquid shut-off valve 27 and the gas shut-off valve 28, and it is easy to bundle the second pipe 62 and / or the air supply and exhaust hose 6 with the refrigerant pipes 31 and 32 during product installation. In the present embodiment, the angle formed by the refrigerant pipes 31 and 32 and the straight pipe portion of the second pipe 62 adjacent to the refrigerant pipes 31 and 32 is 20 degrees or less.

[0149] As described above, in the air conditioner 1 of the first embodiment, by providing the muffler 70 in the air supply and exhaust path, it is possible to reduce the blowing sound per unit air volume heard from the blowout port side of the indoor unit 2. In addition, in the case of maintaining the same blowing sound as that of an air conditioner that does not use the muffler 70, the air supply and exhaust fan 43 of the air conditioner 1 of the first embodiment can increase the air supply volume.

[0150] Therefore, it is possible to simply increase the air supply volume without making the user feel a change in the blowing sound. Specifically, in the air conditioner 1 of the first embodiment, it is estimated that the air supply volume per unit time increases by about 20%.

[0151] (6) Features

[0152] (6-1)

[0153] In the air conditioner 1, a part of the muffler 70 that reduces the sound propagating in the first pipe 61 is disposed inside the outdoor unit 3 in a state of being connected to the first pipe 61. Since the muffler 70 is disposed inside the outdoor unit 3 close to the sound source, the sound deadening effect is improved.

[0154] (6-2)

[0155] In the air conditioner 1, the muffler 70 includes a first sound deadening portion 71 and a second sound deadening portion 72. A part of the first sound deadening portion 71 is disposed inside the outdoor unit 3. The second sound deadening portion 72 is disposed outside the outdoor unit 3. The first sound deadening portion 71 is connected to the first pipe 61 inside the outdoor unit close to the sound source, and the volume is also increased by the first sound deadening portion 71 and the second sound deadening portion 72, so the sound deadening effect is further improved.

[0156] (6-3)

[0157] In the air conditioner 1, the interior of the outdoor unit 3 is partitioned into a machine room 50a where a compressor 21 serving as a heat source is disposed, and a blower room 50b adjacent to the machine room 50a. Since a part of the first sound-absorbing portion 71 is housed in the machine room 50a, dew condensation inside the first sound-absorbing portion 71 is suppressed by the heat of the compressor 21.

[0158] (6-4)

[0159] In the air conditioner 1, the first sound-absorbing portion 71 is disposed so as to straddle the right side plate 52 of the outdoor unit 3. As a result, the volume of the first sound-absorbing portion �1 increases, and the sound-absorbing effect is improved.

[0160] (6-5)

[0161] In the air conditioner 1, the volume of the first sound-absorbing portion 71 closer to the sound source is larger than the volume of the second sound-absorbing portion 72, so that the sound-absorbing effect is improved.

[0162] (7) Modification

[0163] As Figure 6B shown, a communication portion 52a is provided on the right side plate 52 in such a manner that the first sound-absorbing portion 71 of the muffler 70 can penetrate from the inside to the outside of the outdoor unit 3. In the event of a fire inside or outside the outdoor unit 3, the gap G between the communication portion 52a and the first sound-absorbing portion 71 may become a passage for flames.

[0164] Figure 9 is an external perspective view of the muffler 70 of the modification. In Figure 9 it, the muffler 70 has a flange 703. The flange 703 is provided symmetrically with respect to a vertical plane including the central axis C1 of the first connecting portion 711 and the central axis C2 of the second connecting portion 722.

[0165] When the muffler 70 is installed from the communication portion 52a, the gap G is blocked by the flange 703. Therefore, even in the event of a fire inside or outside the outdoor unit 3, the gap G does not become a passage for flames.

[0166] <Second Embodiment>

[0167] Figure 10A is a partial front view of the outdoor unit 3 of the air conditioner 1 according to the second embodiment. In addition, Figure 10B is Figure 10A the right side view of the outdoor unit 3 described in

[0168] In Figure 10A and Figure 10B for the sake of easy explanation, the cover 55 is represented by an imaginary line (double-dot chain line), and the right side plate 52 can be seen through the cover 55. In addition, for Figure 10AThe outdoor unit 3 described is partially shown in a sectional view for understanding the internal structure.

[0169] In addition, regarding the "directions" used in the description, follow Figure 10A the directions marked by the arrows of the four directions of "up", "down", "left", and "right", and Figure 10B the directions marked by the arrows of the four directions of "up", "down", "front", and "back".

[0170] In the second embodiment, the form of the muffler in the first embodiment is changed, and accordingly, the right side plate is also partially changed. Since other devices and components are not changed, only the muffler and the right side plate will be described here.

[0171] (1) Details of the muffler 80

[0172] As shown in Figure 10A and Figure 10B , the muffler 80 has a first muffling portion 81 and a second muffling portion 82. The first muffling portion 81 and the second muffling portion 82 are connected by an intermediate pipe 83.

[0173] When supplying outdoor air from the outdoor unit 3 to the indoor unit 2, the muffler 80 reduces the sound propagating in the first pipe 61. In addition, when discharging air from the indoor unit 2 to the outdoor unit 3, the muffler 80 reduces the sound propagating in the second pipe 62.

[0174] (1-1) The first muffling portion 81

[0175] Figure 11 is a perspective view of the appearance of the muffler 80. In Figure 11 , the first muffling portion 81 includes a cylindrical first muffling portion main body 810, a first upper connecting portion 811, and a first lower connecting portion 812 (refer to Figure 10A ). Since the entire first muffling portion 81 is housed in the mechanical chamber 50a inside the outdoor unit 3, dew condensation inside the first muffling portion 71 is suppressed by the heat of the compressor 21.

[0176] (1-1-1) The first muffling portion main body 810

[0177] Figure 12 is a longitudinal sectional view of the muffler 80. In Figure 12 , the first muffling portion main body 810 has a housing 810a as a shell. The first muffling portion main body 810 also has a sound-absorbing material 810b and a cavity 810c surrounded by the sound-absorbing material 810b inside the housing 810a.

[0178] As raw materials for the sound-absorbing material 810b, felt, foamed polyurethane, etc. can be used. Since the cavity 810c is connected to the first duct 61, the air delivered to the indoor unit 2 or the air delivered from the indoor unit 2 passes through the cavity 810c.

[0179] In the air conditioner 1, the sound generated by the air supply and exhaust fan 43 is reduced by the first sound-absorbing portion 81 connected to the first duct 61 of the outdoor unit 3 before being delivered to the indoor unit 2. Therefore, in this air conditioner 1, the sound transmitted from the outdoor unit 3 to the indoor unit 2 becomes smaller.

[0180] The first upper connecting portion 811 protrudes vertically upward from the top plate 810d of the housing 810a. In addition, the first lower connecting portion 812 protrudes vertically downward from the bottom plate 810e of the housing 810a.

[0181] (1-1-2) The first upper connecting portion 811

[0182] As Figure 10A and Figure 10B shown, the first upper connecting portion 811, which is the upper end of the first sound-absorbing portion 81, is connected to the terminal of the first duct 61 extending from the humidifying unit 4 inside the outdoor unit 3.

[0183] As Figure 11 shown, the first upper connecting portion 811 has a cylindrical shape. A protrusion 811a and a slit 811b are provided on the first upper connecting portion 811. The protrusion 811a has a rectangular shape and protrudes radially from the outer peripheral surface. The slit 811b is recessed vertically downward from the upper end surface of the first upper connecting portion 811.

[0184] A concave portion (not shown) that fits with the protrusion 811a and a convex portion (not shown) that fits with the slit 811b are provided on the first duct 61 connected to the first upper connecting portion 811, and the protrusion 811a and the slit 811b function as "positioning" and "anti-rotation" components.

[0185] (1-1-3) The first lower connecting portion 812

[0186] As Figure 10A and Figure 10B shown, inside the outdoor unit 3, the first end 83a of the intermediate duct 83 is connected to the first lower connecting portion 812, which is the lower end of the first sound-absorbing portion 81.

[0187] As Figure 12 shown, the first lower connecting portion 812 has a cylindrical shape. The first lower connecting portion 812 is arranged on the same axis as the first upper connecting portion 811 along the right side plate 52 of the outdoor unit 3.

[0188] (1-2) The second sound-absorbing portion 82

[0189] The second sound absorption part 82 includes a cylindrical second sound absorption part main body 820, a second upper connection part 821, and a second lower connection part 822. The second sound absorption part 82 is housed between the right side plate 52 and the cover 55.

[0190] (1-2-1) Second sound absorption part main body 820

[0191] As Figure 12 shown, the second sound absorption part main body 820 has an outer shell 820a as a housing. The second sound absorption part main body 820 has a sound absorption material 820b and a cavity 820c surrounded by the sound absorption material 820b inside the outer shell 820a.

[0192] As the raw material of the sound absorption material 820b, felt, foamed polyurethane, etc. can be used. The cavity 820c is connected to the first sound absorption part 81 via an intermediate pipe 83, so the air delivered to the indoor unit 2 or the air delivered from the indoor unit 2 passes through this cavity 820c.

[0193] In the air conditioner 1, the sound generated by the air supply and exhaust fan 43 is reduced by the first sound absorption part 81 connected to the first pipe 61 of the outdoor unit 3 before being delivered to the indoor unit 2, and is further reduced by the second sound absorption part 82. Therefore, in this air conditioner 1, the sound transmitted from the outdoor unit 3 to the indoor unit 2 becomes smaller.

[0194] The second upper connection part 821 protrudes vertically upward from the top plate 820d of the outer shell 820a. In addition, the second lower connection part 822 protrudes vertically downward from the bottom plate 820e of the outer shell 820a.

[0195] (1-2-2) Second upper connection part 821

[0196] As Figure 11 shown, the second upper connection part 821 is cylindrical. A connection mechanism 821a is provided on the second upper connection part 821. The connection mechanism 821a makes it easy to connect and disconnect the intermediate pipe 83 with respect to the second end 83b.

[0197] (1-2-3) Second lower connection part 822

[0198] As Figure 11 and Figure 12 shown, the second lower connection part 822 is cylindrical. The second lower connection part 822 is arranged on the same axis as the right side plate 52 of the outdoor unit 3 and the second upper connection part 821. A second pipe 62 is connected to the second lower connection part 822.

[0199] (1-3) Intermediate pipe 83

[0200] The intermediate duct 83 is a cylindrical air passage. A part of the intermediate duct 83 is housed inside the outdoor unit 3, and the remaining part is housed together with the second sound-absorbing portion 82 between the right side plate 52 and the cover 55.

[0201] The intermediate duct 83 has a first end 83a connected to the first lower connecting portion 812 of the first sound-absorbing portion 81, a second end 83b connected to the second upper connecting portion 821 of the second sound-absorbing portion 82, and a bent portion 83c connecting the first end 83a and the second end 83b.

[0202] The intermediate duct 83 connects the first sound-absorbing portion 81 located inside the outdoor unit 3 and the second sound-absorbing portion 82 located outside the outdoor unit 3, so the intermediate duct 83 penetrates the right side plate 52. Therefore, the central axis C5 of the first end 83a and the central axis C6 of the second end 83b are offset in the horizontal direction.

[0203] The bent portion 83c descends while bending gradually from the first end 83a along a vertical plane including the central axis C5 of the first end 83a and the central axis C6 of the second end 83b toward the outside of the right side plate 52 to reach the second end 83b.

[0204] Therefore, compared with the case where the first sound-absorbing portion and the second sound-absorbing portion are of an integral type, or the case where the path from the first sound-absorbing portion to the second sound-absorbing portion is straight tubular, the degree of freedom in selecting the positions of the first sound-absorbing portion 81 and the second sound-absorbing portion 82 is greater.

[0205] For example, in the case of an integral type, when the position of the first sound-absorbing portion changes, the position of the second sound-absorbing portion also necessarily changes. On the other hand, in the case of a separated type, even if the position of the first sound-absorbing portion 81 changes, if the intermediate duct 83 is changed, the position of the second sound-absorbing portion 82 may not be changed. Or, the bending degree of the intermediate duct 83 can be changed so as to change only the position of the second sound-absorbing portion 82 without changing the position of the first sound-absorbing portion 81.

[0206] In addition, compared with the first sound-absorbing portion 81 and the second sound-absorbing portion 82, the cross-section of the intermediate duct 83 orthogonal to the air flow direction is smaller, and the cross-section orthogonal to the air flow direction becomes smaller as it gets closer to the second end 83b. Therefore, it is only necessary to provide a hole in the right side plate 52 of the outdoor unit 3 that can allow the intermediate duct 83 to penetrate, so the insertion through-hole provided in the right side plate 52 of the outdoor unit 3 can be reduced compared with the structure where the first sound-absorbing portion and the second sound-absorbing portion are of an integral type.

[0207] As described above, in the air conditioner 1 of the second embodiment, by providing the muffler 80 in the air supply and exhaust path, the blowing sound per unit air volume heard from the blowout side of the indoor unit 2 can be reduced. In addition, when maintaining the same blowing sound as that of the air conditioner without using the muffler 80, the air supply volume of the air supply and exhaust fan 43 of the air conditioner 1 of the second embodiment can be increased.

[0208] Therefore, it is possible to simply increase the air supply volume without making the user feel a change in the blowing sound. Specifically, in the air conditioner 1 of the second embodiment, it is expected that the air supply volume per unit time will increase by about 20%.

[0209] (2) Features

[0210] (2-1)

[0211] In the air conditioner 1, the muffler 80 includes a first muffling portion 81 and a second muffling portion 82. The first muffling portion 81 is disposed inside the outdoor unit 3. The second muffling portion 82 is disposed outside the outdoor unit 3. The first muffling portion 81 is connected to the first duct 61 inside the outdoor unit 3 near the sound source, and the volume is also increased by the first muffling portion 81 and the second muffling portion 82, so the muffling effect is further improved.

[0212] (2-2)

[0213] In the air conditioner 1, the muffler 80 further includes an intermediate duct 83 that connects the first muffling portion 81 and the second muffling portion 82. The intermediate duct 83 has a first end 83a connected to the first muffling portion 81 and a second end 83b connected to the second muffling portion 82. The first end 83a and the second end 83b are offset in the horizontal direction. Even if the position of the first muffling portion 81 changes, as long as the intermediate duct 83 is changed, the position of the second muffling portion 82 does not need to be changed. Or, it is possible to change the intermediate duct 83 so as to only change the position of the second muffling portion 82 without changing the position of the first muffling portion 81.

[0214] (2-3)

[0215] In the air conditioner 1, the cross section of the intermediate duct 83 orthogonal to the air flow direction is smaller than that of the first muffling portion 81 and the second muffling portion 82. The intermediate duct 83 penetrates the right side plate 52 of the outdoor unit 3. As long as a hole that allows the intermediate duct 83 to penetrate is provided in the right side plate 52 of the outdoor unit 3, the shape of the right side plate 52 of the outdoor unit 3 can be simplified.

[0216] (2-4)

[0217] In the air conditioner 1, the intermediate duct 83 has a bent portion 83c in the path from the first end 83a to the second end 83b. By providing the intermediate duct 83 with the bent portion 83c, even when it is desired to move the position of the second sound absorbing portion 82, adjustment can be made by means of the degree of bending of the intermediate duct 83. Therefore, there is no need to redesign the overall shape of the muffler 80.

[0218] (2-5)

[0219] In the air conditioner 1, with respect to the intermediate duct 83, the cross section orthogonal to the air flow direction becomes smaller as it approaches the second end 83b.

[0220] (2-6)

[0221] In the air conditioner 1, the interior of the outdoor unit 3 is partitioned into a machine room 50a in which the compressor 21 serving as a heat source is disposed, and a blower room 50b adjacent to the machine room 50a. Since the first sound absorbing portion 81 is housed in the machine room 50a, dew condensation inside the first sound absorbing portion 81 is suppressed by the heat of the compressor 21.

[0222] (2-7)

[0223] In the air conditioner 1, since the volume of the first sound absorbing portion 81 closer to the sound source is larger than the volume of the second sound absorbing portion 82, the sound absorption effect is improved.

[0224] (3) Modification

[0225] As Figure 10B shown, on the right side plate 52, a communication portion 521 is provided in such a manner that the intermediate duct 83 of the muffler 80 can penetrate from the inside of the outdoor unit 3 to the outside. In the event of a fire inside or outside the outdoor unit 3, the gap S between the communication portion 521 and the intermediate duct 83 may become a passage for the flame.

[0226] Figure 13 is an external perspective view of the modified muffler 80. In Figure 13 it, the intermediate duct 83 has a flange 83d. The flange 83d is provided symmetrically with respect to the vertical plane including the central axis C5 of the first end 83a of the intermediate duct 83 and the central axis C6 of the second end 83b.

[0227] When the intermediate duct 83 is installed from the communication portion 521, the gap S is blocked by the flange 83d. Therefore, even in the event of a fire inside or outside the outdoor unit 3, the gap S will not become a passage for the flame.

[0228] As described above, the embodiments of the present disclosure have been described, but it should be understood that various changes in form and detailed structure can be made without departing from the gist and scope of the present disclosure recited in the claims.

[0229] Description of Reference Numerals

[0230] 1: Air conditioner unit;

[0231] 2: Indoor unit;

[0232] 3: Outdoor unit;

[0233] 21: Compressor;

[0234] 43: Air supply and exhaust fan (fan);

[0235] 50a: Machine room (first room);

[0236] 50b: Blower room (second room);

[0237] [[ID=!26]]52a: Connecting part;

[0238] 61: First duct (air passage);

[0239] 70: Silencer;

[0240] 71: First sound absorption part;

[0241] 72: Second sound absorption part;

[0242] 80: Silencer;

[0243] 81: First sound absorption part;

[0244] 82: Second sound absorption part;

[0245] 83: Intermediate duct (duct);

[0246] 83a: First end;

[0247] 83b: Second end;

[0248] 83c: Bending part;

[0249] 703: Flange.

[0250] Prior Art Documents

[0251] Patent Documents

[0252] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2004-69173 Note: There seems to be a potential error in the original text where the tag [[ID=!26]] might be incorrect. It's likely just a regular . This has been translated as while maintaining the integrity of the rest of the text.

Claims

1. An air conditioning device that supplies outdoor air from an outdoor unit (3) to an indoor unit (2), wherein the air conditioning device includes: a fan (43); an air passage (61) through which the air supplied by the fan (43) to the indoor unit passes; and silencers (70, 80) that reduce the sound propagating in the air passage (61) while being connected to the air passage (61), a part of the silencers (70, 80) is disposed inside the outdoor unit (3), the silencers (70, 80) include: a first sound-absorbing part (71, 81) with at least a part disposed inside the outdoor unit (3); and a second sound-absorbing part (72, 82) disposed outside the outdoor unit (3).

2. The air conditioning device according to claim 1, wherein the silencer (80) further includes a pipe (83) connecting the first sound-absorbing part (81) and the second sound-absorbing part (82), the pipe (83) has: a first end (83a) connected to the first sound-absorbing part (81); and a second end (83b) connected to the second sound-absorbing part (82), the first end (83a) and the second end (83b) are offset in the horizontal direction.

3. The air conditioning device according to claim 2, wherein the cross-section of the pipe (83) orthogonal to the air flow direction is smaller than that of the first sound-absorbing part (81) and the second sound-absorbing part (82), the pipe (83) penetrates the side surface of the outdoor unit (3).

4. The air conditioning device according to claim 2 or 3, wherein the pipe (83) has a bent part (83c) on the path from the first end (83a) to the second end (83b).

5. The air conditioning device according to claim 2 or 3, wherein for the pipe (83), the cross-section orthogonal to the air flow direction becomes smaller as it gets closer to the second end (83b).

6. The air conditioning device according to claim 1 or 2, wherein the interior of the outdoor unit (3) is partitioned into a first chamber (50a) where a compressor (21) serving as a heat source is disposed, and a second chamber (50b) adjacent to the first chamber (50a), a part of the first sound-absorbing part (71, 81) is accommodated in the first chamber (50a).

7. The air conditioning device according to claim 1, wherein the first sound-absorbing part (71) is configured to straddle the side surface of the outdoor unit (3).

8. The air conditioning device according to claim 1 or 2, wherein the volume of the first sound-absorbing part (71, 81) is larger than the volume of the second sound-absorbing part (72, 82).

9. The air conditioning device according to claim 2, wherein a communication part (52a) through which a part of the silencer (70) penetrates is formed on the side surface of the outdoor unit (3), the silencer (70) has a flange (703) covering the gap between the silencer (70) and the communication part (52a).

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