Air conditioner

Abstract

An air conditioner (A) according to the present invention is provided with: a heat exchanger (15) having a heat transfer tube (r1) formed from aluminum or an aluminum alloy; and connection piping (r0) through which the refrigerant flowing out of the heat transfer pipe (r1) or the refrigerant flowing into the heat transfer pipe (r1) passes, at least a portion of the connection piping (r0) being formed from aluminum or aluminum alloy aluminum piping, and at least a portion of at least one of the connection piping (r0) connected to each of two refrigerant inlets / outlets provided in the heat transfer pipe (r1) being formed from aluminum or aluminum alloy aluminum piping. The cover is covered by a sound insulation material, a sound absorption material or a sound blocking material (19a, 19b).

Description

Technical Field

[0001] The present invention relates to an air conditioner. Background Art

[0002] Copper tubes are the mainstream for heat exchangers in air conditioners (room air conditioners). However, in recent years, the use of aluminum tubes in heat exchangers in outdoor units has been increasing.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2023-013765 Summary of the invention

[0006] Problems to be solved by the invention

[0007] When an aluminum tube or an aluminum alloy tube is used for a heat exchanger and a connecting pipe, there arises a problem of leakage of sound due to the flow of refrigerant.

[0008] Patent Document 1 describes a manufacturing method for brazing a heat transfer pipe and a connecting pipe made of aluminum without increasing the cost, but does not describe reducing the sound generated by the refrigerant flowing through the heat transfer pipe and the connecting pipe.

[0009] Therefore, an object of the present invention is to provide an air conditioner capable of suppressing refrigerant noise even when an aluminum tube or an aluminum alloy tube is used for at least a part of a heat exchanger and connecting pipes.

[0010] Means for solving problems

[0011] In order to solve the above-mentioned problems, the air conditioner of the present invention comprises: a heat exchanger having a heat pipe formed of aluminum or an aluminum alloy; and a connecting pipe, through which the refrigerant flowing out of the heat pipe or the refrigerant flowing into the heat pipe passes, and at least a portion of the connecting pipe is formed of an aluminum pipe made of aluminum or an aluminum alloy, and at least a portion of at least one of the connecting pipes respectively connected to two refrigerant inlets and outlets provided on the heat pipe is covered with a sound insulation material, a sound absorbing material or a sound barrier material.

[0012] Effects of the Invention

[0013] According to the present invention, it is possible to provide an air conditioner capable of suppressing refrigerant noise even when an aluminum tube or an aluminum alloy tube is used for at least a part of a heat exchanger and connecting pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a perspective view of the indoor unit of the air conditioner according to the first embodiment of the present invention as seen from the upper right front.

[0015] Figure 2 This is a perspective view of the indoor unit of the air conditioner as seen from the lower right front.

[0016] Figure 3 This is a structural diagram including the indoor unit and outdoor unit of the air conditioner.

[0017] Figure 4 This is a schematic diagram of an indoor heat exchanger.

[0018] Figure 5 yes Figure 4 An enlarged cross-sectional view of part I.

[0019] Figure 6 is a schematic diagram of the flow in a sharply narrowed tube.

[0020] Figure 7 This is a schematic diagram of an indoor heat exchanger after sound insulation materials and the like are attached.

[0021] Figure 8 This is a schematic diagram of the flow in the rapid expansion pipe of the second embodiment.

[0022] Fig. 9 The second embodiment Figure 4 FIG. 1 is an enlarged cross-section of part I.

[0023] Fig.10 This is a schematic diagram of an indoor heat exchanger to which the sound insulating material, the sound absorbing material, or the sound blocking material of the second embodiment is attached. DETAILED DESCRIPTION

[0024] <<First Implementation Method>>

[0025] <Structure of Air Conditioner A>

[0026] Figure 1 The indoor unit 1 of the air conditioner A according to the first embodiment of the present invention is shown in a perspective view when viewed from the upper right front.

[0027] Figure 2 The indoor unit 1 of the air conditioner A is shown in a perspective view when viewed from the lower right front.

[0028] The air conditioner A is a device that performs indoor air conditioning such as cooling operation or heating operation.

[0029] The air conditioner A includes an indoor unit 10 installed indoors (see Figure 1 ) and an outdoor unit 20 installed outdoors (refer to Figure 3 ). Figure 3 A diagram showing a configuration including an indoor unit 1 and an outdoor unit 20 of an air conditioner A.

[0030] Figure 1The indoor unit 10 shown includes an indoor unit 1 that performs air-conditioning operation.

[0031] Figure 3 The indoor unit 1 shown is connected to the outdoor unit 20 via a connecting pipe r0 through which the refrigerant circulates. The connecting pipe r0 is a pipe that connects the indoor heat exchanger 15 in the indoor unit 1 and the refrigerant pipe r20 of the outdoor unit 20.

[0032] In addition, the indoor unit 1 is connected to the outdoor unit 20 via a power line and a communication line.

[0033] Figure 1 The indoor unit 1 shown includes a panel 11 forming an outer frame and a filter 12 for removing dust from indoor air.

[0034] The panel 11 is used to store the indoor heat exchanger 15 (see Figure 3 )、Indoor fan 16 (refer to Figure 3 ) and other resin boxes.

[0035] Filter 12 (refer to Figure 1 ) from the indoor heat exchanger 15 (refer to Figure 3 ) collects dust from the air flowing. The filter 12 is provided in the indoor unit 1 (see Figure 1 )'s upper and front sides.

[0036] In addition, the indoor unit 1 includes an indicator lamp 13 (see Figure 2 )、up and down wind deflectors 14 (refer to Figure 2 )、Indoor heat exchanger 15 (refer to Figure 3 ) and indoor fan 16 (refer to Figure 3 ).

[0037] Figure 2 The display lamp 13 shown indicates the state of the air-conditioning operation of the indoor unit 1 and the like.

[0038] The vertical wind deflector 14 is a plate-shaped member that adjusts the vertical wind direction of the air blown out from the indoor unit 1. The vertical wind deflector 14 is driven by a wind deflector motor (not shown) to change the rotation angle. In addition, a horizontal wind deflector (not shown) is sometimes provided to adjust the horizontal wind direction of the air blown out from the indoor unit 1.

[0039] Figure 3 The solid arrows shown indicate the flow of the refrigerant in the heating cycle.

[0040] Figure 3 The dashed arrows shown indicate the flow of the refrigerant in the refrigeration cycle.

[0041] The air conditioner A includes a compressor 21, an outdoor heat exchanger 22, an outdoor fan 23, an expansion valve 24, and a four-way valve 25 as components provided in the outdoor unit 20. The air conditioner A also includes an indoor heat exchanger 15 and an indoor fan 16 as components provided in the indoor unit 1.

[0042] The compressor 21 is a device that compresses low-temperature, low-pressure gas refrigerant and discharges it as high-temperature, high-pressure gas refrigerant. Figure 3 Although not shown in the figure, a water storage tank for separating the refrigerant into gas and liquid is provided on the suction side of the compressor 21 .

[0043] The outdoor heat exchanger 22 is a heat exchanger that performs heat exchange between the refrigerant flowing through the heat transfer pipe (not shown) and the outside air.

[0044] Figure 3 The outdoor fan 23 shown is a fan that sends outside air into the outdoor heat exchanger 22. The outdoor fan 23 is provided near the outdoor heat exchanger 22 using an outdoor fan motor 23a as a driving source.

[0045] The expansion valve 24 is a valve that decompresses the refrigerant condensed by the "condenser" (one of the outdoor heat exchanger 22 and the indoor heat exchanger 15). In addition, the refrigerant decompressed by the expansion valve 24 is transported to the "evaporator" (the other of the outdoor heat exchanger 22 and the indoor heat exchanger 15). In addition, the refrigerant at the outlet of the evaporator has a large gas or gas ratio, so there is a phenomenon of a faster flow rate. For example, when the indoor heat exchanger 15 becomes an evaporator, the refrigerant at the outlet of the indoor heat exchanger 15 has a large gas or gas ratio, and the flow rate at the outlet of the indoor heat exchanger 15 is faster.

[0046] Figure 4 A schematic diagram showing the indoor heat exchanger 15 is shown.

[0047] The indoor heat exchanger 15 is a device for performing heat exchange between the refrigerant flowing through the heat transfer pipe r1 and the indoor air. The indoor fan 16 is a fan for sending indoor air to the indoor heat exchanger 15. The indoor fan 16 is provided near the indoor heat exchanger 15 with an indoor fan motor 16a as a driving source.

[0048] The four-way valve 25 switches the flow path of the refrigerant according to the operation mode of the air conditioner A. For example, Figure 3 During cooling operation as shown by the dotted arrows, in the refrigerant circuit Q1, the refrigerant circulates in the compressor 21, the outdoor heat exchanger 22 (condenser), the expansion valve 24, and the indoor heat exchanger 15 (evaporator) in sequence. Figure 3During the heating operation indicated by the solid arrows, in the refrigerant circuit Q1, the refrigerant circulates in the compressor 21, the indoor heat exchanger 15 (condenser), the expansion valve 24, and the outdoor heat exchanger 22 (evaporator) in sequence.

[0049] <Indoor heat exchanger 15>

[0050] Figure 5 express Figure 4 An enlarged cross-sectional view of part I.

[0051] The indoor heat exchanger 15 includes a heat transfer pipe r1 and fins 27 formed on the heat transfer pipe r1 (see Figure 5 The heat transfer pipe r1 is made of aluminum or aluminum alloy. The refrigerant after heat exchange flows in the heat transfer pipe r1. The fin 27 is a component for increasing the heat exchange area.

[0052] When connecting the connecting pipe r0 to the heat transfer pipe r1 responsible for heat exchange, it is considered to reduce the diameter of the connecting pipe r0 and insert the shrinkage part r01 into the heat transfer pipe r1. Here, the aluminum tube (aluminum alloy tube) is lower in strength than the copper tube, so it is considered to increase the wall thickness compared with the copper tube. In the case where the aluminum tube is applied to the indoor heat exchanger 15 of the indoor unit 10, it is considered that the ratio of the inner diameter s1 of the heat transfer pipe r1 to the inner diameter s2 of the shrinkage part of the connecting pipe, that is, the inner diameter ratio s2 / s1, is increased compared with the case of the copper tube. As a result, the pressure loss increases and the refrigerant sound becomes louder. The indoor unit 10 is used in a quiet space such as a living space. Therefore, when the aluminum tube is applied to the indoor heat exchanger 15 of the indoor unit 10, the refrigerant sound may leak into the living space.

[0053] A plate 28 is provided as a reinforcement member adjacent to the heat transfer pipe r1 . The heat transfer pipe r1 is supported by the plate 28 .

[0054] The heat transfer pipe r1 of the indoor heat exchanger 15 is connected to a refrigerant circuit Q1 (see Figure 3 ) in the moving connecting pipe r0.

[0055] like Figure 5 As shown, the connecting pipe r0 has a reduced pipe portion r01.

[0056] In order to prevent the connection pipe r0 from breaking, the connection pipe r0 is inserted into the heat transfer pipe r1 deep in the plate 28. That is, the outer side surface r0a of the connection pipe r0 is in contact with the inner side surface r1a of the heat transfer pipe r1. The connection pipe r0 has a constricted portion r01, and the outer side surface r0a of the connection pipe r0 is in contact with the inner side surface r1a of the heat transfer pipe r1, thereby being able to insert the connection pipe r0 into the heat transfer pipe r1 deep in the plate 28 and securely fix it, and being able to prevent the connection pipe r0 from breaking.

[0057] Here, if the inner diameter s1 of the heat transfer pipe r1 is Figure 5 ), the inner diameter s2 of the connecting pipe r01, the strength of the connecting pipe r0 of the aluminum tube is low, so the wall thickness is formed thicker than that of the copper tube.

[0058] Therefore, when the heat transfer pipe r1 and the connecting pipe r0 are aluminum pipes, the difference s9 between the inner diameter s1 of the heat transfer pipe r1 and the inner diameter s2 of the connecting pipe r01 is larger than when both the heat transfer pipe r1 and the connecting pipe r0 are copper pipes.

[0059] That is, s1 / s2=s9 increases.

[0060] <Shock tube K1>

[0061] The following, Figure 6 The flow in the sharply reduced pipe K1 shown will be described.

[0062] Figure 6 A schematic diagram showing the flow in the abrupt reduction tube K1. Figure 6 In FIG. 1 , the flow phenomenon in the abruptly narrowed tube K1 is exaggeratedly emphasized.

[0063] The flow path changes from the tube k11 having a larger cross-sectional area A11 to the tube k12 having a smaller cross-sectional area A12.

[0064] Specifically, the flow is from the flow of the thick pipe k11 ( Figure 6 The arrow α11) changes suddenly to the flow of the capillary k12 ( Figure 6 α13).

[0065] In the flow from the thick tube k11 ( Figure 6 The arrow α11) changes suddenly to the flow of the capillary k12 ( Figure 6 During the process of arrow α13), a vortex is generated ( Figure 6 Arrow α12), resulting in energy loss, in other words, pressure loss.

[0066] As described above, when the copper tube is changed to an aluminum or aluminum alloy tube, the aluminum tube becomes thicker due to its low strength. Therefore, the cross-sectional area ratio A12 / A11 becomes larger. As a result, the generation of vortices becomes larger. That is, by changing to an aluminum tube, the pressure loss increases.

[0067] Therefore, the connection pipe r0 made of aluminum or aluminum alloy has larger vibration due to energy loss caused by pressure loss than the copper pipe, and the noise, that is, the refrigerant sound increases.

[0068] <Soundproofing material, sound absorbing material or soundproofing material 19a, 19b, 19c and indoor heat exchanger 15>

[0069] Figure 7A schematic diagram showing an indoor heat exchanger 15 to which sound insulating materials, sound absorbing materials or sound blocking materials 19a, 19b, 19c are attached. Hereinafter, the sound insulating materials, sound absorbing materials or sound blocking materials 19a, 19b, 19c are referred to as sound insulating materials 19a, 19b, 19c, etc.

[0070] Therefore, in order to reduce the sound generated by the vortex generated in the connecting pipe r0 of aluminum or aluminum alloy, the following structure is adopted: That is, sound insulating materials 19a, 19b are attached to the parts r01, r02 of the shrinkable connecting pipe r0 where the sound is generated.

[0071] As described above, the refrigerant at the outlet of the indoor heat exchanger 15 that becomes the evaporator has a large gas or gas ratio, and therefore has a high flow rate. Figure 5 The connecting pipe r0 at the position of ) also generates noise.

[0072] Therefore, the length of the aluminum pipe of the connecting pipe r0 of the portion covered by the sound insulating material, the sound absorbing material or the sound blocking material (either one of 19a and 19b) in the connecting pipe r0 connected to the refrigerant outlet when the indoor heat exchanger 15 becomes the evaporator is longer than the length of the aluminum pipe of the portion covered by the sound insulating material, the sound absorbing material or the sound blocking material (either one of 19a and 19b) in the connecting pipe r0 connected to the refrigerant inlet when the indoor heat exchanger 15 becomes the evaporator. As a result, the noise of the connecting pipe r0 connected to the refrigerant outlet when the indoor heat exchanger 15 becomes the evaporator is reduced.

[0073] In addition, vibration also comes from Figure 7 The refrigerant inlet and outlet of the heat transfer pipe r1 of the indoor heat exchanger 15 shown in FIG. Figure 5 The noise is transmitted to the portion r03 of the bent pipe closest to the connection portion between the heat transfer pipe r1 and the connecting pipe r0 shown, thereby generating noise.

[0074] Therefore, the sound insulating material 19c is also attached to the part r03 where the vibration is transmitted and the sound is generated, which is close to the vortex generation part. The sound insulating material 19c and the like reduce the noise of the part r0 where the vibration is transmitted and the sound is generated.

[0075] That is, with the setting Figure 7 The bent pipe (r03) closest to the refrigerant inlet and outlet among at least one of the connecting pipes r0 of the aluminum pipe connected to the two refrigerant inlets and outlets (r01, r02) of the heat transfer pipe r1 shown is covered with sound insulation material, sound absorbing material or sound blocking material 19c.

[0076] The sound insulation materials 19a, 19b, 19c, etc. are made of rubber, such as butyl rubber. For example, the wall thickness of the butyl rubber (sound insulation materials 19a, 19b, 19c, etc.) is 3 mm, and the wall thickness of the aluminum pipe forming the connecting pipe r0 is 1 mm. By making the wall thickness of the butyl rubber (sound insulation materials 19a, 19b, 19c, etc.) thicker than the wall thickness of the aluminum pipe, the sound insulation effect is improved.

[0077] In addition, the sound insulating materials 19a, 19b, 19c, etc. may be made of materials other than butyl rubber.

[0078] The sound insulating materials 19a, 19b, 19c, etc. are made of a material that is softer than aluminum or aluminum alloy. This is because the sound insulating materials 19a, 19b, 19c, etc. cannot cover the connecting pipe r0 unless they are soft to a certain extent.

[0079] By attaching the sound insulating materials 19a, 19b, 19c, etc., the sound generated by the refrigerant is blocked. For example, at least a part of the contraction parts r01, r02 of the connecting pipe r0 is covered with the sound insulating materials 19a, 19b, 19c, etc. At least a part of the contraction parts r01, r02 of the connecting pipe r0 refers to the contraction parts r01, r02 limited to the first sound source and covered with the sound insulating materials 19a, 19b, 19c, etc.

[0080] By covering the connecting pipe r0 with the sound insulating materials 19a, 19b, 19c, etc., the sound generated by the vibration of the connecting pipe r0 can be blocked. In addition, by increasing the weight of the connecting pipe r0, the vibration of the connecting pipe can be suppressed, and the sound affecting the room can be suppressed.

[0081] In addition, the weight of the connecting pipe r0 is increased by the sound insulating materials 19a, 19b, 19c, etc., so as to suppress the vibration of the connecting pipe r0. In this way, the sound affecting the room can be suppressed. For example, the sound insulating materials 19a, 19b, 19c, etc. are added with weights such that the total weight of the connecting pipe r0 formed of aluminum or aluminum alloy and the sound insulating materials 19a, 19b, 19c, etc. is equal to or heavier than the weight of the connecting pipe r0 formed of copper.

[0082] <Condensation water>

[0083] In addition, the sound insulation materials 19a, 19b, 19c pasted on the contraction parts r01, r02 and the bent piping part r03 have a small insulation effect, and the difference between the contraction parts r01, r02 and the bent piping part r03 and the ambient temperature is large, so condensed water is generated on the sound insulation materials 19a, 19b, 19c.

[0084] Therefore, if Figure 7As shown, a dew container 30 for receiving condensed water is provided below the sound insulating materials 19a, 19b, 19c, etc. where all the sound insulating materials 19a, 19b, 19c, etc. are stored. In other words, the sound insulating materials 19a, 19b, 19c, etc. are located within the range vertically above the dew container 30 for receiving condensed water. Thus, the dew container 30 can receive condensed water generated on the sound insulating materials 19a, 19b, 19c, etc.

[0085] Second Implementation Method

[0086] Figure 8 A schematic diagram showing the flow of the rapid expansion tube K2 of the second embodiment. Figure 8 In the figure, the phenomenon of the flow in the rapid expansion tube K2 is exaggerated.

[0087] In the first embodiment, the connecting pipe r0 is a sharply reduced pipe K1 (see Figure 6 ) has been described, in the second embodiment, the connecting pipe r2 (refer to Fig.10 ) is the emergency expansion tube K2 (refer to Figure 8 ) is explained.

[0088] <Emergency expansion tube K2>

[0089] In the rapidly expanding tube K2, the flow path changes from the tube k21 having a narrow cross-sectional area A21 to the tube k22 having a wide cross-sectional area A22.

[0090] Specifically, the flow is from the flow of the capillary k21 ( Figure 8 The arrow α21) changes suddenly to the flow of the thick tube k22 ( Figure 8 α23).

[0091] And, the flow from the capillary k21 ( Figure 8 The arrow α21) changes suddenly to the flow of the thick tube k22 ( Figure 8 During the process of arrow α23), a vortex is generated ( Figure 8 Arrow α22), resulting in loss.

[0092] As in the first embodiment, if the heat transfer pipe r1 and the connecting pipe r2 are changed from copper pipes to aluminum pipes, the strength of the aluminum pipe is low, so the thickness needs to be increased. If the thickness is thick, the cross-sectional area ratio A22 / A21 is large, the vortex is large, and the sound generated by the vortex becomes louder. That is, by changing the heat transfer pipe r1 and the connecting pipe r2 to aluminum or aluminum alloy pipes, the pressure loss increases.

[0093] Fig. 9 The second embodiment is shown Figure 4 FIG. 1 is an enlarged cross-section of part I.

[0094] In the second embodiment, the connecting pipe r2 has an expanded pipe portion r2a instead of the connecting pipe r0 (see FIG. 1 ) of the first embodiment. Figure 5 ) of the reduced tube portion r01.

[0095] The heat transfer pipe r1 of the indoor heat exchanger 15 is connected to a connection pipe r2 for moving the refrigerant.

[0096] The connecting pipe r2 has an expanded pipe portion r2a. In order to prevent the connecting pipe r2 from breaking, the connecting pipe r2 is deeply inserted into the heat transfer pipe r1. That is, the connecting pipe r2 has an expanded pipe portion r2a whose inner side surface r2b contacts the outer side surface r1b of the heat transfer pipe r1.

[0097] The connecting pipe r2 has the expanded pipe portion r2a, and the inner side surface r2b of the connecting pipe r2 is in contact with the outer side surface r1b of the heat transfer pipe r1, so that the connecting pipe r2 can be reliably fixed to the heat transfer pipe r1.

[0098] Here, if the inner diameter of the aluminum tube heat transfer pipe r1 is s1 and the inner diameter of the aluminum tube connecting pipe r2 is s3, the aluminum tube heat transfer pipe r1 has low strength and thus has a thicker wall thickness.

[0099] Therefore, compared with the case where both the heat transfer pipe r1 and the connection pipe r2 are copper pipes, the difference s10 between the inner diameter s3 of the connection pipe r2 of the aluminum pipe and the inner diameter s1 of the heat transfer pipe r1 of the aluminum pipe is larger.

[0100] That is, s3 / s1=s10 is larger.

[0101] Therefore, the cross-sectional ratio A32 / A31 is large. Therefore, the generation of vortex is large, and the sound generated by the vortex becomes louder.

[0102] Fig.10 A schematic diagram showing the indoor heat exchanger 15 to which sound insulating materials (sound insulating materials, sound absorbing materials, or sound blocking materials) 29a, 29b, 29c, etc. according to the second embodiment are attached.

[0103] In the second embodiment, in order to reduce the sound generated by the vortex, sound insulating materials 29a, 29b are also attached to the parts r21, r22 of the expanded connecting pipe r2 where the sound is generated. For example, at least a part of the expanded pipe part r2a of the connecting pipe r2 is covered with the sound insulating materials 29a, 29b.

[0104] In addition, a sound insulating material 29c and the like are also attached to a portion r23 close to the vortex generation portion and where the vibration is transmitted and the sound is generated. By attaching the sound insulating materials 29a, 29b, 29c and the like, the sound generated by the refrigerant is soundproofed.

[0105] Similar to the first embodiment, the sound insulating materials 29a, 29b, 29c, etc. are made of rubber, for example, butyl rubber. The sound insulating materials 29a, 29b, 29c, etc. are made of a material that is softer than aluminum or aluminum alloy.

[0106] in addition, Fig.10 The heat insulating effect of the sound insulating materials 29a, 29b, 29c and the like shown is small, and the temperature difference between the parts r21, r22, r23 and the surroundings is large, so condensed water is generated in the sound insulating materials 29a, 29b, 29c.

[0107] Therefore, a dew container 31 for receiving condensed water is provided at a position below where all the sound insulating materials 29a, 29b, 29c, etc. converge. In other words, the sound insulating materials 29a, 29b, 29c, etc. are located within a range vertically above the dew container 31 for receiving condensed water. Thus, the dew container 31 can receive condensed water generated on the sound insulating materials 29a, 29b, 29c, etc.

[0108] In addition, in the first and second embodiments, the present invention is applied to the indoor heat exchanger 15 of the indoor unit 1, but the present invention can also be applied to the outdoor heat exchanger 22 of the outdoor unit 20 (see Figure 3 In this case, the refrigerant pipe r20 connected to the outdoor heat exchanger 22 corresponds to the connecting pipe.

[0109] In addition, the above-mentioned embodiments are described in detail to explain the present invention in an easy-to-understand manner, and are not limited to necessarily having all the structures described. In addition, with respect to a part of the structure of each embodiment, other structures can be added, deleted, or replaced.

[0110] In addition, the above-mentioned mechanisms and structures show the structures and structures considered necessary for explanation, and do not necessarily show all the mechanisms and structures in the product.

[0111] Explanation of symbols

[0112] 15: Indoor heat exchanger

[0113] 19a~19c, 29a~29c: sound insulation material, sound absorbing material or sound blocking material

[0114] 30, 31: Dew container

[0115] A: Air conditioner

[0116] r0, r2: Connecting pipes

[0117] r01, r02: shrinkage part (refrigerant inlet and outlet)

[0118] r0a: External surface of the connecting pipe

[0119] r1: heat pipe

[0120] r1a: inner side of the heat pipe

[0121] r1b: outer surface of the heat pipe

[0122] r2a: Pipe expansion unit

[0123] r2b: Inner surface of the connecting pipe

Claims

1. An air conditioner, characterized in that: have: A heat exchanger having a heat conducting pipe formed of aluminum or an aluminum alloy; as well as a connecting pipe through which the refrigerant flowing out of the heat transfer pipe or flowing into the heat transfer pipe passes, and at least a portion of the connecting pipe is formed of an aluminum pipe made of aluminum or an aluminum alloy, At least a portion of the aluminum pipe of at least one of the connecting pipes respectively connected to the two refrigerant inlets and outlets provided in the heat transfer pipe is covered with a sound insulating material, a sound absorbing material, or a sound blocking material.

2. The air conditioner according to claim 1, characterized in that: The total weight of the aluminum pipe and the sound insulating material, the sound absorbing material, or the sound blocking material is heavier than the weight when the aluminum pipe is assumed to be formed of copper.

3. The air conditioner according to claim 1 or 2, characterized in that: The connecting pipe has a connecting portion, the outer side surface of the connecting portion contacts the inner side surface of the heat conducting pipe, or the inner side surface of the connecting portion contacts the outer side surface of the heat conducting pipe. At least a portion of the connection portion of the aluminum pipe is covered by the sound insulating material, the sound absorbing material, or the sound blocking material.

4. The air conditioner according to claim 1 or 2, characterized in that: At least a portion of the aluminum pipes of both of the connecting pipes respectively connected to the two refrigerant inlets and outlets provided in the heat transfer pipe is covered with a sound insulating material, a sound absorbing material, or a sound blocking material.

5. The air conditioner according to claim 4, characterized in that: The length of the portion of the aluminum pipe covered by the sound insulation material, the sound absorption material or the sound barrier material in the connecting pipe connected to the refrigerant outlet when the heat exchanger becomes an evaporator is longer than the length of the portion of the aluminum pipe covered by the sound insulation material, the sound absorption material or the sound barrier material in the connecting pipe connected to the refrigerant inlet when the heat exchanger becomes an evaporator.

6. The air conditioner according to claim 1 or 2, characterized in that: Among at least one of the connecting pipes respectively connected to the two refrigerant inlets and outlets provided in the heat transfer pipe, the bent pipe closest to the refrigerant inlet and outlet is covered by the sound insulating material, the sound absorbing material or the sound blocking material.

7. The air conditioner according to claim 1 or 2, characterized in that: The sound insulating material, the sound absorbing material or the sound blocking material is made of a material that is softer than aluminum or aluminum alloy.

8. The air conditioner according to claim 1 or 2, characterized in that: The connecting portion is a contracted portion whose outer side surface contacts the inner side surface of the heat transfer pipe, or an expanded portion whose inner side surface contacts the outer side surface of the heat transfer pipe.

9. The air conditioner according to claim 1 or 2, characterized in that: The thickness of the sound insulating material, the sound absorbing material or the sound blocking material is thicker than the wall thickness of the aluminum pipe.

10. The air conditioner according to claim 1 or 2, characterized in that: A dew container for receiving condensed water is provided below the sound insulating material, the sound absorbing material or the sound blocking material.

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