Heat exchanger unit and outdoor unit

Abstract

A heat exchanger unit and an outdoor unit. A heat exchanger unit (20) is provided with an axial fan (30), a bell mouth (40), a heat exchanger (50), and a housing (60). The housing (60) houses the axial fan (30), the bell mouth (40), and the heat exchanger (50). The trumpet-shaped member (40) has a pressure variation component transmission part (70). The shortest distance (L) between the pressure fluctuation component transmission unit (70) and the housing (60) or the heat exchanger (50) is 10 mm or more. The pressure fluctuation component transmission unit (70) is configured so as to reduce pressure fluctuations occurring between the axial fan (30) and the bell mouth (40).

Description

Technical Field

[0001] The utility model relates to a heat exchanger unit and an outdoor unit. Background Art

[0002] As a technology related to the fan cover of an axial flow fan, there is a technology described in Patent Document 1. Patent Document 1 describes that the fan cover is formed entirely or partially from a through-porous material such as an aluminum sintered alloy or a resin. When the blades of the axial flow fan approach the fan cover, the fan cover of Patent Document 1 absorbs the impact sound of the wind caused by the rapid change of wind pressure by using the through-porous material, thereby reducing the blade spacing sound, that is, NZ sound.

[0003] Patent Document 1: Japanese Utility Model Application Laid-Open No. 6-25597

[0004] In a bell mouth provided with an axial flow fan, it is preferable that the wind noise generated on the surface of the bell mouth can be reduced in addition to reducing the NZ noise. Utility Model Content

[0005] A heat exchanger unit according to a first perspective for solving this problem comprises an axial flow fan, a bell mouth, a heat exchanger and a shell that accommodates the axial flow fan, the bell mouth and the heat exchanger, wherein the bell mouth has a pressure change component permeable portion, the shortest distance between the pressure change component permeable portion and the shell or the heat exchanger is more than 10 mm, and the pressure change component permeable portion is configured to reduce the pressure change generated between the axial flow fan and the bell mouth.

[0006] According to this structure, by ensuring that the shortest distance is greater than 10 mm, when the air passing through the bell mouth and the axial flow fan generates pressure fluctuations, the air easily passes through the pressure fluctuation component permeable portion, thereby reducing the pressure fluctuations. As a result, the surface vortex generated at the bell mouth can be reduced, and thus the wind noise caused by the surface vortex can be appropriately reduced.

[0007] The heat exchanger unit of the second viewpoint is a heat exchanger unit of the first viewpoint, wherein the pressure changing component permeation portion is provided with a reinforcing member for maintaining the strength of the bell-mouth, and at least one reinforcing member is provided at the pressure changing component permeation portion in the circumferential direction of the bell-mouth, and the width of the reinforcing member is less than 50 mm. When at least two reinforcing members are provided at the pressure changing component permeation portion, the reinforcing members are provided at intervals in the circumferential direction of the bell-mouth.

[0008] According to this configuration, the pressure fluctuation component transmission portion can be arranged in the bell mouth, and the strength of the bell mouth can be improved.

[0009] A heat exchanger unit according to a third aspect is the heat exchanger unit according to the first and second aspects, wherein the pressure fluctuation component permeating portion is provided at a portion other than a portion closest to the casing or the heat exchanger, in the peripheral wall of the bell mouth.

[0010] According to this configuration, when pressure fluctuation occurs in the air passing between the bell mouth and the axial flow fan, the air easily passes through the pressure fluctuation component permeation portion, and thus the pressure fluctuation can be reduced.

[0011] A heat exchanger unit according to a fourth aspect In the heat exchanger unit according to the first to third aspects, the housing includes a top plate, a bottom plate, and a partition plate that partitions a space within the housing into a heat exchange chamber and a machine chamber.

[0012] According to this configuration, the pressure fluctuation component transmission portion can be arranged while appropriately maintaining the strength of the bell mouth.

[0013] A heat exchanger unit according to a fifth aspect is the heat exchanger unit according to the first to fourth aspects, wherein the pressure fluctuation component permeation portion has pores having an average pore diameter of 1000 μm or less that communicate with the peripheral wall of the bell mouth in the thickness direction.

[0014] According to this structure, when the pressure of the air passing through the bell mouth and the axial flow fan changes, the air near the peripheral wall is allowed to pass through the pressure change component permeable portion, and excessive air is prevented from passing through the pressure change component permeable portion. Thus, the loss of air passing through the axial flow fan can be reduced.

[0015] A heat exchanger unit according to a sixth aspect is the heat exchanger unit according to the fifth aspect, wherein the average pore size is 700 μm or less.

[0016] According to this structure, when the pressure of the air passing through the bell mouth and the axial flow fan changes, the air near the peripheral wall is allowed to pass through the pressure change component permeable portion, and excessive air is prevented from passing through the pressure change component permeable portion. Thus, the loss of air passing through the axial flow fan can be reduced.

[0017] An outdoor unit according to a seventh aspect for solving the above-mentioned problems includes the heat exchanger unit according to the first to sixth aspects.

[0018] According to this structure, when the air passing through the bell mouth and the axial flow fan generates pressure fluctuation, the air easily passes through the pressure fluctuation component permeable portion, thereby reducing the pressure fluctuation. Thus, the surface vortex generated in the bell mouth can be reduced, thereby appropriately reducing the wind noise caused by the surface vortex. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view schematically showing the interior of an outdoor unit including a heat exchanger unit.

[0020] Figure 2 It is schematically indicated Figure 1 A partial cross-sectional view of the interior of an outdoor unit.

[0021] Figure 3 yes Figure 1 A three-dimensional diagram of the bell mouth.

[0022] Description of symbols

[0023] 10 outdoor unit; 12 heat exchange chamber; 13 machine chamber; 20 heat exchanger unit; 30 axial flow fan; 40 bell mouth; 41 peripheral wall; 47 closest part; 50 heat exchanger; 60 shell; 61 top plate; 62 bottom plate; 63 partition plate; 70 pressure change component permeation part; 80 reinforcement component; L shortest distance; S space; W width. DETAILED DESCRIPTION

[0024] <Outdoor unit>

[0025] like Figure 1 and Figure 2 As shown, the outdoor unit 10 includes a heat exchanger unit 20. The outdoor unit 10 is an outdoor unit of an air conditioner that performs cooling and heating of a space in a room. The outdoor unit 10 has a horizontally long rectangular parallelepiped shape. The outdoor unit 10 is, for example, a box-type outdoor unit. The outdoor unit 10 is connected to the indoor unit through a refrigerant pipe.

[0026] <Heat exchanger unit>

[0027] like Figure 1 and Figure 2 As shown, the heat exchanger unit 20 includes an axial flow fan 30, a bell mouth 40, a heat exchanger 50, and a housing 60. The axial flow fan 30, the bell mouth 40, and the heat exchanger 50 are accommodated in the housing 60. The housing 60 includes a top plate 61, a bottom plate 62, and a partition plate 63.

[0028] The top plate 61 constitutes the top surface of the housing 60. The bottom plate 62 constitutes the bottom surface of the housing 60. The top plate 61 and the bottom plate 62 are rectangular plates. The housing 60 further includes an outer wall 64 extending in the thickness direction of the bottom plate 62. The housing 60 has the top plate 61 at the end of the outer wall 64 on the opposite side to the bottom plate 62.

[0029] The outer wall 64 includes a first outer wall 65, a second outer wall 66, a third outer wall 67, and a fourth outer wall 68. The first outer wall 65 constitutes an outer peripheral wall surface in the first direction A1 orthogonal to the axis C of the bell mouth 40. The second outer wall 66 constitutes another outer peripheral wall surface in the first direction A1 orthogonal to the axis C of the bell mouth 40. For example, the first outer wall 65 constitutes an outer peripheral wall surface on the left side of the housing 60 when viewed from the front. For example, the second outer wall 66 constitutes an outer peripheral wall surface on the right side of the housing 60 when viewed from the front.

[0030] The third outer wall 67 constitutes one outer peripheral wall surface in the second direction A2 along the axis C of the bell mouth 40. The fourth outer wall 68 constitutes another outer peripheral wall surface in the second direction A2 along the axis C of the bell mouth 40. For example, the third outer wall 67 constitutes the outer peripheral wall surface on the front side of the housing 60, and the fourth outer wall 68 constitutes the outer peripheral wall surface on the rear side of the housing 60.

[0031] The third outer wall 67 has a circular opening 67a. The mesh-shaped blow-out grill 11 is attached to the opening 67a. The first outer wall 65 has a first suction port 65a. The fourth outer wall 68 has a second suction port 68a.

[0032] The partition plate 63 partitions the space S in the housing 60 into the heat exchange chamber 12 and the machine chamber 13. The heat exchange chamber 12 is a space S in the housing 60 near the first outer wall 65. The heat exchange chamber 12 is provided with an axial flow fan 30, a bell mouth 40, a heat exchanger 50, and the like.

[0033] The machine room 13 is a space S on the second outer wall 66 side in the housing 60. The machine room 13 is provided with a compressor 14 and an electrical component box 15, etc. The compressor 14 is provided at the lower part in the machine room 13. The electrical component box 15 is a vertically long box-shaped and is arranged along the partition plate 63. The electrical component box 15 contains a substrate and the like on which electrical components are mounted, and the electrical components constitute an electronic circuit, and the electronic circuit is configured to control the compressor 14, the axial flow fan motor 16, and the electronic expansion valve, etc.

[0034] The axial flow fan 30 has a rotating shaft portion 31 and blades 32 connected to the rotating shaft portion 31. The number of blades 32 is 5 or less. For example, the number of blades 32 is 3. The axial flow fan 30 is housed in the housing 60 in a state where the rotating shaft portion 31 is connected to the axial flow fan motor 16. The axial flow fan motor 16 is supported by a fan motor seat (not shown) provided in the heat exchange chamber 12. The axial flow fan motor 16 is mounted on the fan motor seat. The axial flow fan motor 16 is arranged at a predetermined position by the fan motor seat. The axial flow fan 30 is connected to the rotating shaft 16a of the axial flow fan motor 16, and rotates in one direction by the rotation of the axial flow fan motor 16.

[0035] The heat exchanger 50 is arranged in the heat exchange chamber 12 along the first suction port 65a provided on the first outer wall 65 and the second suction port 68a provided on the fourth outer wall 68. The heat exchanger 50 is a heat exchanger formed in an L-shape in a plan view along the inner surfaces of the first suction port 65a and the second suction port 68a. The heat exchanger 50 is composed of a heat transfer tube and a plurality of fins. The heat exchanger 50 is, for example, a cross-fin tube type or a microchannel type heat exchanger.

[0036] The heat exchanger unit 20 is configured such that air introduced from the first suction port 65a provided on the first outer wall 65 and the second suction port 68a provided on the fourth outer wall 68 is blown out from the opening 67a of the housing 60 by the rotation of the blades 32 of the axial flow fan 30. The opening 67a is also referred to as a blow-out port. The external air sucked from the outside of the housing 60 by the axial flow fan 30 exchanges heat with the refrigerant in the heat transfer tube via the heat transfer tube and the fins of the heat exchanger 50.

[0037] <Bell Mouth>

[0038] Reference Figure 2 and Figure 3 The bell mouth 40 will be described. The bell mouth 40 is housed in the housing 60 in a state of being attached to the periphery of the opening 67a of the housing 60. Figure 3 As shown, the bell mouth 40 has a peripheral wall 41 connected in a circular ring shape when viewed from the front. The peripheral wall 41 has a blow-out portion 42, a cylindrical portion 43, and a suction portion 44.

[0039] The blowout portion 42 is located at the end 45 on the downstream side of the bell mouth 40. The blowout portion 42 is curved so that the inner diameter becomes smaller as it moves toward the end 46 on the upstream side of the bell mouth 40. The cylindrical portion 43 extends continuously from the end on the upstream side of the blowout portion 42 toward the end 46 on the upstream side of the bell mouth 40. The inner diameter of the cylindrical portion 43 is constant from the end on the upstream side of the blowout portion 42 to the end on the downstream side of the suction portion 44. The axis of the cylindrical portion 43 coincides with the axis C of the bell mouth 40.

[0040] The suction portion 44 extends continuously from the upstream end of the cylindrical portion 43. The suction portion 44 is curved so that the inner diameter increases from the upstream end of the cylindrical portion 43 toward the upstream end 46 of the bell mouth 40.

[0041] The thickness of the peripheral wall 41 is not particularly limited. The thickness of the peripheral wall 41 is, for example, 1 mm or more. The thickness of the peripheral wall 41 is preferably 2 mm or more. The thickness of the peripheral wall 41 is, for example, 10 mm or less. The thickness of the peripheral wall 41 is preferably 5 mm or less. The thickness of the peripheral wall 41 is preferably 2 mm or more and 5 mm or less.

[0042] The material of the peripheral wall 41 is not particularly limited. The material of the peripheral wall 41 is, for example, resin, ceramic, metal, etc. When the material of the peripheral wall 41 is resin, it is preferable because the bell mouth 40 can be made lighter while maintaining its strength.

[0043] like Figure 1 and Figure 3 As shown in FIG. 1 , the bell mouth 40 has a pressure fluctuation component permeation portion 70. Figure 1 and Figure 3 In FIG. 1 , the pressure fluctuation component transmission portion 70 is indicated by dots.

[0044] <Pressure fluctuation component permeation section>

[0045] Reference Figure 3 Next, the pressure fluctuation component permeation portion 70 will be described. The pressure fluctuation component permeation portion 70 is configured to reduce the pressure fluctuation generated between the axial flow fan 30 and the bell mouth 40 .

[0046] The shortest distance L between the pressure-variable component permeable portion 70 provided in the bell mouth 40 and the housing 60 or the heat exchanger 50 is 10 mm or more. The shortest distance L between the pressure-variable component permeable portion 70 and the housing 60 or the heat exchanger 50 is preferably 20 mm or more. The shortest distance L is the shortest distance from the radially outer side surface 40a of the bell mouth 40 to the top plate 61, the bottom plate 62, the partition plate 63 or the heat exchanger 50.

[0047] The closest portion 47 closest to the housing 60 or the heat exchanger 50 in the peripheral wall 41 of the bell mouth 40 is sometimes less than 10 mm. In this case, the pressure change component permeable portion 70 is provided in a portion other than the closest portion 47 closest to the housing 60 or the heat exchanger 50 in the peripheral wall 41 of the bell mouth 40. Specifically, the pressure change component permeable portion 70 is provided in a portion other than the closest portion 47 closest to the housing 60 in the peripheral wall 41 of the bell mouth 40. Alternatively, the pressure change component permeable portion 70 is provided in a portion other than the closest portion 47 closest to the heat exchanger 50 in the peripheral wall 41 of the bell mouth 40.

[0048] In one example, four pressure-variable component permeable portions 70 are provided in the circumferential direction at a portion where the shortest distance L between the pressure-variable component permeable portion 70 and the housing 60 or the heat exchanger 50 is 10 mm or more in the circumferential wall 41 of the bell mouth 40. For example, the pressure-variable component permeable portion 70 is provided in the cylindrical portion 43 of the circumferential wall 41. The pressure-variable component permeable portion 70 may also be provided across the cylindrical portion 43 of the circumferential wall 41, a portion of the blow-out portion 42, and a portion of the suction portion 44.

[0049] The pressure variable component permeable portion 70 is coplanar with the surfaces of the cylindrical portion 43, the blowing portion 42, and the suction portion 44 of the peripheral wall 41. The thickness of the pressure variable component permeable portion 70 is substantially the same as the thickness of the peripheral wall 41 other than the pressure variable component permeable portion 70.

[0050] The pressure change component permeation portion 70 is composed of a porous body. The porous body penetrates the peripheral wall 41 in the thickness direction. The porous body has open pores connected to the outside. The open pores are pores that connect the peripheral wall 41 in the thickness direction. There is no particular restriction on the average pore size of the open pores. The average pore size of the open pores is preferably less than 1000 μm, and more preferably less than 700 μm. There is no particular restriction on the method for measuring the average pore size. The average pore size can be measured, for example, by a gas adsorption method also known as the BET method. The conditions of the gas adsorption method are, for example, test conditions based on JIS Z8831-2 2010 or ISO 15901-2 2006. It can also be test conditions based on JIS Z8830 2013 or ISO 9277 2010.

[0051] The material of the pressure change component permeable portion 70 is not particularly limited. The material of the porous body is, for example, resin, ceramic, metal, etc. For example, the resin is a foamed resin. For example, the ceramic or metal is a porous sintered body. The metal may also be a mesh body also called a mesh. When the material of the porous body is a porous sintered body, it is easy to control the average pore size, so it is preferred.

[0052] There is no particular limitation on the method of providing the pressure-variable component permeable portion 70 on the peripheral wall 41 of the bell mouth 40. For example, by providing an opening for the pressure-variable component permeable portion 70 to be fitted in the peripheral wall 41 of the bell mouth 40, and fitting the pressure-variable component permeable portion 70 having a predetermined shape in the opening, the pressure-variable component permeable portion 70 can be provided on the peripheral wall 41. The pressure-variable component permeable portion 70 can also be attached to the portion of the peripheral wall 41 of the bell mouth 40 corresponding to the opening using a known adhesive. The pressure-variable component permeable portion 70 can also be provided on the bell mouth 40 by insert molding.

[0053] like Figure 3 As shown in FIG. 1 , a reinforcing member 80 for maintaining the strength of the bell mouth 40 is provided in the pressure fluctuation component transmission portion 70. The reinforcing member 80 will be described later.

[0054] <Reinforcement Parts>

[0055] Reference Figure 3 The reinforcing member 80 is described below. In the circumferential direction of the bell mouth 40, one or more reinforcing members 80 are provided at the pressure change component permeable portion 70. The reinforcing member 80 is preferably provided at the compressed portion of the pressure change component permeable portion 70. For example, the reinforcing member 80 is provided at the inner side surface 71 of the pressure change component permeable portion 70 in a manner perpendicular to the radial direction of the bell mouth 40. For example, the reinforcing member 80 is provided at the central portion of the inner side surface 71 of the pressure change component permeable portion 70. Figure 3In FIG. 1 , the reinforcement member 80 provided on the inner side surface 71 is indicated by a solid line when it is visible in a three-dimensional observation, and the reinforcement member 80 provided on the inner side surface 71 is indicated by a dotted line when it is not visible.

[0056] The width W of the reinforcing member 80 is preferably 50 mm or less. When a plurality of pressure-variable component permeable portions 70 are provided at different locations of the bell mouth 40, the reinforcing member 80 is provided at more than one pressure-variable component permeable portion 70. When two or more reinforcing members 80 are provided at the bell mouth 40, the reinforcing members 80 are provided at intervals in the circumferential direction of the bell mouth 40 at the pressure-variable component permeable portion 70. When two or more reinforcing members 80 are provided at one pressure-variable component permeable portion 70, the reinforcing members 80 are provided at intervals in the circumferential direction of the bell mouth 40.

[0057] The reinforcing member 80 is, for example, a rib. The rib is made of, for example, metal. When the reinforcing member 80 is a rib, it is configured to protrude relative to the inner side surface 71. The reinforcing member 80 may also be a sealing member made of resin.

[0058] <Effects of Implementation Methods>

[0059] In the heat exchanger unit 20 and the outdoor unit 10 of the present embodiment, the shortest distance L between the pressure-variable component permeable portion 70 provided in the bell mouth 40 and the housing 60 or the heat exchanger 50 is 10 mm or more. Therefore, when the air passing through the surrounding of the axial flow fan 30 undergoes pressure fluctuations, the air easily passes through the pressure-variable component permeable portion 70. In other words, the air undergoing pressure fluctuations easily escapes through the pressure-variable component permeable portion 70.

[0060] <Effects of Implementation Methods>

[0061] The effects of the embodiment will be described.

[0062] (1) The heat exchanger unit 20 includes an axial flow fan 30, a bell mouth 40, a heat exchanger 50, and a shell 60 that accommodates the axial flow fan 30, the bell mouth 40, and the heat exchanger 50, wherein the bell mouth 40 has a pressure change component permeable portion 70, and the shortest distance L between the pressure change component permeable portion 70 and the shell 60 or the heat exchanger 50 is greater than 10 mm. The pressure change component permeable portion 70 is configured to reduce the pressure change generated between the axial flow fan 30 and the bell mouth 40.

[0063] According to this structure, by ensuring that the shortest distance L is greater than 10 mm, when the pressure of the air passing between the bell mouth 40 and the axial flow fan 30 changes, the air easily passes through the pressure change component permeable portion 70, thereby reducing the pressure change. As a result, the surface vortex generated in the bell mouth 40 can be reduced, and thus the wind noise caused by the surface vortex can be appropriately reduced. In addition, the pressure change component permeable portion 70 can be selectively provided in the portion where the shortest distance L is greater than 10 mm.

[0064] (2) A reinforcing member 80 for maintaining the strength of the bell mouth 40 is provided in the pressure change component permeable portion 70. In the circumferential direction of the bell mouth 40, at least one reinforcing member 80 is provided in the pressure change component permeable portion 70. The width W of the reinforcing member 80 is less than 50 mm. When at least two reinforcing members 80 are provided in the pressure change component permeable portion 70, the reinforcing members 80 are provided at intervals in the circumferential direction of the bell mouth 40.

[0065] According to this configuration, the pressure fluctuation component transmission portion 70 can be disposed in the bell mouth 40 , and the strength of the bell mouth 40 can be improved.

[0066] (3) The pressure fluctuation component permeable portion 70 is provided in a portion other than the closest portion 47 closest to the casing or the heat exchanger 50 in the peripheral wall 41 of the bell mouth 40 .

[0067] According to this configuration, when pressure fluctuation occurs in the air passing between the bell mouth 40 and the axial flow fan 30 , the air easily passes through the pressure fluctuation component permeation portion 70 , and thus the pressure fluctuation can be reduced.

[0068] (4) The housing 60 includes the top plate 61 , the bottom plate 62 , and the partition plate 63 that partitions the space S in the housing 60 into the heat exchange chamber 12 and the machine chamber 13 .

[0069] According to this configuration, when pressure fluctuation occurs in the air passing between the bell mouth 40 and the axial flow fan 30 , the air easily passes through the pressure fluctuation component permeation portion 70 , and thus the pressure fluctuation can be reduced.

[0070] (5) The pressure fluctuation component transmission portion 70 has pores having an average pore diameter of 1000 μm or less that communicate with the peripheral wall 41 of the bell mouth 40 in the thickness direction.

[0071] According to this configuration, when pressure fluctuation occurs in the air passing between the bell mouth 40 and the axial flow fan 30, air near the peripheral wall 41 is allowed to pass through the pressure fluctuation component permeable portion 70, while excessive air is prevented from passing through the pressure fluctuation component permeable portion 70. Thus, the loss of air passing through the axial flow fan 30 can be reduced.

[0072] (6) The pressure fluctuation component permeable portion 70 has pores having an average pore diameter of 700 μm or less that communicate with the peripheral wall 41 of the bell mouth 40 in the thickness direction.

[0073] According to this configuration, when pressure fluctuation occurs in the air passing between the bell mouth 40 and the axial flow fan 30, air near the peripheral wall 41 is allowed to pass through the pressure fluctuation component permeable portion 70, while excessive air is prevented from passing through the pressure fluctuation component permeable portion 70. Thus, the loss of air passing through the axial flow fan 30 can be reduced.

[0074] (7) The outdoor unit 10 includes the heat exchanger unit 20 .

[0075] According to this structure, when the pressure of the air passing through the bell mouth 40 and the axial flow fan 30 changes, the air easily passes through the pressure change component permeable portion 70, thereby reducing the pressure change. As a result, the surface vortex generated in the bell mouth 40 can be reduced, so the wind noise caused by the surface vortex can be appropriately reduced.

[0076] <Change example>

[0077] The heat exchanger unit 20 and the outdoor unit 10 of the present disclosure may be a combination of, for example, the following modified examples and at least two modified examples that do not contradict each other, in addition to the above-described embodiment.

[0078] The outdoor unit 10 may be an outdoor unit of a heat pump water heater that generates hot water through a refrigeration cycle and stores the generated hot water.

[0079] Two or more reinforcing members 80 may be provided for one pressure fluctuation component permeable portion 70 in the circumferential direction of the bell mouth 40 .

[0080] The number of the pressure-variable component permeable portions 70 is not limited to 4. The number of the pressure-variable component permeable portions 70 may be 3 or less, or 5 or more. The intervals between one pressure-variable component permeable portion 70 and other pressure-variable component permeable portions 70 may be random.

[0081] In this embodiment, the pressure-variable component permeable portion 70 is provided in the cylindrical portion 43 of the peripheral wall 41 and is provided across a portion of the blow-out portion 42 and a portion of the suction portion 44, but the present invention is not limited to this embodiment. The pressure-variable component permeable portion 70 may be provided only in the cylindrical portion 43 of the peripheral wall 41.

[0082] In this embodiment, the peripheral wall 41 of the bell mouth 40 has the blowing part 42, the cylindrical part 43 and the suction part 44, but the present invention is not limited to this embodiment. The peripheral wall 41 of the bell mouth 40 may not have the cylindrical part 43. The peripheral wall 41 of the bell mouth 40 may be configured in a state where the blowing part 42 and the suction part 44 are continuous.

[0083] In this embodiment, the porous body constituting the pressure-variable component permeable portion 70 is not limited to a foamed resin or a porous sintered body. The pressure-variable component permeable portion 70 may also be a porous body having a plurality of through holes along one direction. For example, by inserting a needle-shaped member multiple times from one direction into a solid body made of resin, a porous body having a plurality of through holes along one direction can be produced.

[0084] The shortest distance from the pressure-variable component permeable portion 70 to the housing 60 and the shortest distance from the pressure-variable component permeable portion 70 to the heat exchanger 50 may both be 10 mm or more. The shortest distance from the outer side surface 40a of the bell mouth 40 to the top plate 61, the shortest distance from the outer side surface 40a to the bottom plate 62, the shortest distance from the outer side surface 40a to the partition plate 63, and the shortest distance from the outer side surface 40a to the heat exchanger 50 may all be 10 mm or more.

[0085] The pressure fluctuation component permeable portion 70 may be provided at a portion other than the closest portion 47 closest to the casing 60 in the peripheral wall 41 of the bell mouth 40 and at a portion other than the closest portion 47 closest to the heat exchanger 50 in the peripheral wall 41 .

[0086] Although the embodiments of the heat exchanger unit 20 and the outdoor unit 10 have been described above, it should be understood that various changes in form and details may be made without departing from the gist and scope of the heat exchanger unit 20 and the outdoor unit 10 described in the claims.

Claims

1. A heat exchanger unit (20), comprising an axial flow fan (30), a bell mouth (40), a heat exchanger (50), and a housing (60) for accommodating the axial flow fan (30), the bell mouth (40), and the heat exchanger (50), characterized in that: The bell mouth (40) has a pressure fluctuation component permeable portion (70). The shortest distance (L) between the pressure-variable component permeable portion (70) and the housing (60) or the heat exchanger (50) is greater than 10 mm. The pressure fluctuation component permeating portion (70) is configured to reduce pressure fluctuations occurring between the axial flow fan (30) and the bell mouth (40).

2. The heat exchanger unit according to claim 1, characterized in that The pressure fluctuation component transmission portion (70) is provided with a reinforcing member (80) for maintaining the strength of the bell mouth (40). In the circumferential direction of the bell mouth (40), at least one reinforcing member (80) is provided at the pressure fluctuation component transmission portion (70). The width (W) of the reinforcing member (80) is less than 50 mm, When two or more of the reinforcing members (80) are provided in the pressure fluctuation component permeable portion (70), the reinforcing members (80) are provided at intervals in the circumferential direction of the bell mouth (40).

3. The heat exchanger unit according to claim 1, characterized in that The pressure fluctuation component permeable portion (70) is provided in a portion other than a closest portion (47) closest to the casing (60) or the heat exchanger (50) in the peripheral wall (41) of the bell mouth (40).

4. The heat exchanger unit according to claim 1, characterized in that The shell (60) includes a top plate (61), a bottom plate (62), and a partition plate (63) that partitions a space (S) inside the shell (60) into a heat exchange chamber (12) and a machine chamber (13).

5. The heat exchanger unit according to any one of claims 1 to 4, characterized in that The pressure fluctuation component permeable portion (70) has pores having an average pore diameter of 1000 μm or less that communicate with the peripheral wall (41) of the bell mouth (40) in the thickness direction.

6. The heat exchanger unit according to claim 5, characterized in that The average pore diameter is 700 μm or less.

7. An outdoor unit, characterized in that: A heat exchanger unit (20) according to any one of claims 1 to 6.

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