Air conditioner outdoor unit noise reduction structure and air conditioner outdoor unit

Abstract

The present invention belongs to the technical field of an air-conditioning outdoor unit noise reduction structure and an air-conditioning outdoor unit, and specifically, an air-conditioning outdoor unit noise reduction structure and an air-conditioning outdoor unit, comprising an outer shell, a through slot being provided at the front end of the outer shell, a supporting bottom plate being fixedly installed on the lower surface of the outer shell by bolts, a guide sleeve being fixedly installed on the back side of the outer shell away from the through slot, a fan being provided at the front end of the inner arc surface of the guide sleeve, and a noise reduction component being provided at one end of the fan, noise generated by the rotation of the fan enters the noise reduction component through the guide sleeve, and preliminary noise silencing treatment is performed on the noise, and the noise passes through a transfer cover plate into a muffler and is radiated to the surface of a porous sound-absorbing material, and a part of the noise penetrates into the porous material to cause air vibration in the pores and slits of the material, so that part of the sound energy is converted into heat energy and dissipated, and a part of the sound waves are reflected from the surface of the muffler main body, reflected twice on the guide inner cover surface, and returned to the porous sound-absorbing material of the muffler for further attenuation, thereby achieving the function of reducing noise.

Description

Technical Field

[0001] The invention belongs to the technical field of air conditioners, and in particular to a noise reduction structure of an air conditioner outdoor unit and an air conditioner outdoor unit. Background Art

[0002] Noise reduction of air-conditioning outdoor unit refers to taking a series of technical means and measures to reduce the noise generated by the air-conditioning outdoor unit during operation, so as to reduce the interference with the surrounding environment and people's lives. The noise of the air-conditioning outdoor unit is composed of fan noise, compressor noise, motor noise and mechanical noise. Among them, fan noise is mainly generated by the fan and air duct system. The causes of its formation are complex and usually manifest as broadband noise. Conventional noise reduction methods cannot reduce the total noise value.

[0003] A Chinese invention patent publication number CN 106765677 A discloses an air conditioner outdoor unit noise reduction structure and an air conditioner outdoor unit, which belongs to the field of air conditioning technology and is designed to solve the problem of poor noise reduction effect of existing devices. The air conditioner outdoor unit noise reduction structure provided by the present invention is provided with a sound absorbing wedge in a housing of the air conditioner outdoor unit and at a position opposite to the noise source in the housing. The air conditioner outdoor unit noise reduction structure and the air conditioner outdoor unit of the present invention absorb and reduce the noise caused by the vibration of the compressor, fan and other noise sources in the housing by providing a sound absorbing wedge at a position opposite to the noise source in the housing, and have a simple structure and low noise of the whole machine.

[0004] To control the noise of outdoor unit fans, existing solutions mostly focus on using large fans to reduce noise by lowering the rotation speed, or changing the number of blades and optimizing the blade shape to reduce noise. However, due to space and wind pressure requirements, the noise reduction effect is very limited. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows: the noise reduction structure of an air conditioner outdoor unit and the air conditioner outdoor unit described in the present invention include a shell, a through slot is provided at the front end of the shell, a supporting bottom plate is fixedly installed on the lower surface of the shell by bolts, a guide sleeve is fixedly installed on the back of the shell away from the through slot, a fan is provided at the front end of the inner arc surface of the guide sleeve, and a noise reduction component is provided at one end of the fan;

[0007] The noise reduction component includes a connecting shaft fixedly installed on the back of the fan, a transfer cover is fixedly installed on one end of the connecting shaft, a main body is provided in the middle of the transfer cover, connecting parts are provided on the circumference of the outer arc surface of the main body, skirt parts are provided at the front and rear edges of the transfer cover, a muffler is movably connected through one end of the connecting shaft, a main body is provided in the middle of the inner arc surface of the muffler, protruding parts are provided on the circumference of the outer arc surface of the main body, the protruding parts are connected to the skirt part correspondingly, and the main body of the muffler is completely covered on the main body of the transfer cover.

[0008] The outer arc surface of the transfer cover is fixedly sleeved with a silencer assembly, and the silencer assembly includes an inner guide cover fixedly sleeved on the transfer cover, a shockproof end is provided in the middle of one side of the inner guide cover, a porous silencer plate is provided at the edge of one side of the outer arc surface of the inner guide cover, the outer arc surface of the inner guide cover is fixedly connected with a guide outer cover, and a bearing cavity is opened between the guide outer cover and the inner guide cover.

[0009] The inner bottom wall of the bearing cavity is movably sleeved with a perforated plate, the number of the perforated plates is two, and the upper and lower sides of the perforated plates are provided with V-shaped extension ends, one of the perforated plates is connected to the front end of the guide inner cover and is movably overlapped on the protruding part through the V-shaped extension end.

[0010] An arc-shaped stop end is provided at one end of the guide outer cover, and the inner arc surface of the arc-shaped stop end is overlapped to the other perforated plate. A U-shaped portion is provided at the connection between the guide inner cover and the guide outer cover, and a sealing ring is fixedly installed on the guide inner cover and the guide outer cover through the U-shaped portion.

[0011] The sealing ring is annularly sleeved on the peripheral side of the fan, the outer arc surface of the guide cover is tightly connected with the inner arc surface of the guide sleeve, and the inner cavity of the guide sleeve is in a truncated cone shape.

[0012] The inner arc surface of the through groove is provided with an annular groove, and a partition is fixedly installed in the annular groove inside the through groove. The number of the partitions is several and they are evenly distributed on the annular groove in the form of an annular array. A silencer cavity is provided between the several partitions. The silencer cavity is annularly corresponding to the inside of the through groove and is adapted to the guide sleeve.

[0013] The inner side wall of the partition is a hollow structure, and the inner bottom wall of the partition is provided with sound-absorbing cotton, which is adapted to the silencing cavity.

[0014] The upper surface of the partition is provided with air guide holes, the number of which is several and distributed on the partition in the form of a horizontal array, and the upper surface of the supporting base plate is fixed with a compressor by bolts.

[0015] An air-conditioning outdoor unit comprises the air-conditioning outdoor unit noise reduction structure described in any one of the above items, wherein the air-conditioning outdoor unit noise reduction structure is at least located at a position opposite to a compressor in the air-conditioning outdoor unit.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. The noise generated by the rotation of the fan enters the noise reduction component through the guide sleeve for preliminary noise silencing. The noise passes through the transfer cover and enters the muffler. After radiating to the surface of the porous sound-absorbing material, part of it penetrates into the porous material, causing the air in the pores and slits of the material to vibrate, so that part of the sound energy is converted into heat energy and dissipated. Part of the sound waves are reflected from the surface of the muffler body, reflected twice on the inner cover of the guide, and returned to the porous sound-absorbing material of the muffler for further attenuation, thereby achieving the function of reducing noise.

[0018] 2. By increasing the volume utilization rate under its boundary, the effective volume of the muffler is greatly increased. Even when the muffler is not designed with a topological structure, the sound reduction of the muffler can be effectively increased. Moreover, as the effective volume of the muffler increases, the flow resistance of the gaseous refrigerant in the muffler will also decrease accordingly, and the refrigeration performance of the compressor will also be improved and enhanced.

[0019] 3. There are a large number of tiny pores inside the porous sound-absorbing board. When the sound enters these pores, friction, viscosity and heat conduction will occur in the pores, thereby converting the sound energy into heat energy and being consumed. This sound absorption principle enables the porous sound-absorbing board to effectively absorb the medium and high frequency noise generated by the air-conditioning outdoor unit and reduce the intensity of the noise. At the same time, adding a shockproof end in the middle section of the sound channel will partially absorb the vibration generated by the fan. The perforated plates on the front and back sides have a certain elasticity and toughness. When the air-conditioning outdoor unit vibrates, the perforated plates can play a buffering role, absorb part of the vibration energy, and reduce the transmission of vibration to the surrounding environment.

[0020] 4. The sound-absorbing cotton is pasted on the inner wall of the partition, which is mainly used to absorb high-frequency noise and play a certain role in heat preservation to prevent condensation on the fan from the humid air downstream of the evaporator during refrigeration. The silencer cavity formed between the partitions is usually a closed or semi-closed space, and its internal shape and structure are designed to reduce noise by utilizing the principles of reflection, interference and absorption of sound waves. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Figure 1 It is a schematic diagram showing the structure of a noise reduction structure of an air-conditioning outdoor unit and a front-end shell of the air-conditioning outdoor unit of the present invention;

[0023] Figure 2It is a schematic diagram of a noise reduction structure of an air conditioner outdoor unit and a back disassembled structure of the air conditioner outdoor unit of the present invention;

[0024] Figure 3 It is a schematic diagram of the overall cross-sectional structure of a noise reduction structure of an air conditioner outdoor unit and a guide sleeve of the air conditioner outdoor unit of the present invention;

[0025] Figure 4 It is a schematic diagram of a noise reduction structure of an air-conditioning outdoor unit and a planar partial structure of the air-conditioning outdoor unit of the present invention;

[0026] Figure 5 It is a schematic diagram of a noise reduction structure of an air conditioner outdoor unit and a noise reduction component structure of an air conditioner outdoor unit of the present invention;

[0027] Figure 6 The invention discloses a noise reduction structure for an outdoor unit of an air conditioner and a noise reduction structure for an outdoor unit of an air conditioner Figure 1 The structural diagram at A in the middle;

[0028] Figure 7 The present invention is a noise reduction structure of an air-conditioning outdoor unit and a schematic diagram of a partition cross-sectional structure of the air-conditioning outdoor unit.

[0029] In the figure: 1. outer shell; 101. through groove; 102. supporting bottom plate; 2. guide sleeve; 3. fan; 4. noise reduction component; 401. connecting shaft; 402. transfer cover; 403. main body; 404. connecting part; 405. silencer; 406. main body; 407. extension part; 408. skirt; 5. silencer component; 501. guide inner cover; 502. shockproof end; 503. porous silencer plate; 504. guide outer cover; 505. bearing cavity; 506. perforated plate; 507. V-shaped extension end; 508. sealing ring; 509. arc-shaped blocking end; 6. partition; 7. silencer cavity; 8. sound-absorbing cotton; 9. air guide hole; 10. compressor. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0031] Embodiment 1: Figure 1 , Figure 2 , Figure 3 and Figure 5As shown, the embodiment of the present invention comprises a housing 1, a through slot 101 is provided at the front end of the housing 1, a supporting bottom plate 102 is fixedly installed on the lower surface of the housing 1 by bolts, a guide sleeve 2 is fixedly installed on the back of the housing 1 away from the through slot 101, a fan 3 is provided at the front end of the inner arc surface of the guide sleeve 2, a noise reduction component 4 is provided at one end of the fan 3, the noise reduction component 4 comprises a connecting shaft 401 fixedly installed on the back of the fan 3, a transfer cover 402 is fixedly installed at one end of the connecting shaft 401, and the middle part of the transfer cover 402 is provided with the present invention. The body 403 has connecting parts 404 on its outer arc surface, the front and rear edges of the transfer cover 402 are provided with skirt parts 408, one end of the connecting shaft 401 is movably connected with a muffler 405, a main body 406 is provided in the middle of the inner arc surface of the muffler 405, and the outer arc surface of the main body 406 is provided with extension parts 407 on its outer arc surface, the extension parts 407 are connected with the skirt parts 408 correspondingly, and the main body 406 of the muffler 405 is completely covered on the main body 403 of the transfer cover 402.

[0032] The outer shell 1 will have an upper through groove 101 on the front side, and the through groove 101 is in the same plane as the fan 3 and cooperates with the annular groove on the outer shell 1 to form a silencer ring. The fan 3 rotates to generate noise, which enters the noise reduction component 4 through the guide sleeve 2 to perform preliminary silencer treatment on the noise. The noise passes through the transfer cover 402 and enters the silencer 405. After being incident on the surface of the porous sound-absorbing material, a part of the noise penetrates into the porous material, causing the air in the pores and slits of the material to vibrate, so that part of the sound energy is converted into heat energy and dissipated, and a part of the sound waves are reflected from the surface of the main body 406 of the silencer 405, and are reflected twice on the surface of the guide inner cover 501, and return to the porous sound-absorbing material of the silencer 405 for further attenuation, thereby achieving the function of reducing noise.

[0033] The outer edge of the main body 406 of the silencer 405 fits with the end face of the main body 403 of the transfer cover 402 to ensure the tightness and sealing of the connection between the two. Specifically, the extension 407 of the silencer 405 can be connected to the transfer cover 402 by welding, gluing or a bolt assembly. The extension 407 of the silencer 405 is fixedly connected by a bolt assembly. Correspondingly, bolt holes are provided in the transfer cover 402 and the extension 407 of the silencer 405. It should be noted that the outer edge diameter of the main body 406 of the silencer 405 does not exceed the outer edge diameter of the main body 403 to facilitate the installation of the silencer 405.

[0034] Therefore, the silencer 405 in this embodiment does not need to be provided with a bolt avoidance structure during the installation process of the transfer cover 402, thereby increasing the volume utilization rate under its boundary, so that the effective volume of the silencer 405 is greatly increased, and even when the silencer 405 is not topologically designed, the sound reduction amount of the silencer 405 can be effectively increased, and, as the effective volume of the silencer 405 increases, the flow resistance of the gaseous refrigerant in the silencer 405 will also be reduced accordingly, and the refrigeration performance of the compressor 10 will also be improved and enhanced.

[0035] like Figure 2 , Figure 3 and Figure 4 As shown, the outer arc surface of the transfer cover 402 is fixedly sleeved with a silencer assembly 5, and the silencer assembly 5 includes an inner guide cover 501 fixedly sleeved on the transfer cover 402, a shockproof end 502 is provided in the middle of one side of the inner guide cover 501, a porous silencer plate 503 is provided at the edge of one side of the outer arc surface of the inner guide cover 501, and the outer arc surface of the inner guide cover 501 is fixedly connected with an outer guide cover 504, a bearing cavity 505 is opened between the outer guide cover 504 and the inner guide cover 501, and a perforated plate 506 is movably sleeved on the inner bottom wall of the bearing cavity 505, and the number of the perforated plates 506 is two, and the upper and lower sides of the perforated plates 506 are provided with V-shaped extension ends 507, One of the perforated plates 506 is connected to the front end of the guide inner cover 501 and is movably overlapped on the protruding portion 407 through a V-shaped extension end 507. An arc-shaped stop end 509 is provided at one end of the guide outer cover 504. The inner arc surface of the arc-shaped stop end 509 is overlapped on the other perforated plate 506. A U-shaped portion is provided at the connection between the guide inner cover 501 and the guide outer cover 504. A sealing ring 508 is fixedly installed on the guide inner cover 501 and the guide outer cover 504 through the U-shaped portion. The sealing ring 508 is annularly sleeved on the peripheral side of the fan 3. The outer arc surface of the guide outer cover 504 is tightly connected to the inner arc surface of the guide sleeve 2, and the inner cavity of the guide sleeve 2 is in the shape of a frustum of a cone.

[0036] After being reflected by the silencer 405, the sound waves will enter the guide inner cover 501, and the noise will flow from the arc-shaped blocking end 509 and the guide inner cover 501 into the chamber integrated with the guide outer cover 504. The porous silencer plate 503 has a large number of tiny pores inside. When the sound enters these pores, friction, viscosity and heat conduction will occur in the pores, thereby converting the sound energy into heat energy and being consumed. This sound absorption principle enables the porous silencer plate 503 to effectively absorb the medium and high frequency noise generated by the air conditioner outdoor unit and reduce the intensity of the noise. At the same time, adding the shockproof end 502 in the middle section of the sound channel will partially absorb the vibration generated by the fan 3. The perforated plates 506 on the front and rear sides have a certain elasticity and toughness. When the air conditioner outdoor unit vibrates, the perforated plates 506 can play a buffering role, absorb part of the vibration energy, and reduce the transmission of vibration to the surrounding environment.

[0037] When the natural frequency of the system is close to the frequency of the vibration source, resonance will occur, causing the vibration amplitude to increase sharply. By adjusting the parameters of the perforated plate 506, such as thickness, aperture, hole spacing, etc., the natural frequency of the system can be changed to avoid the occurrence of resonance. The holes on the perforated plate 506 can be regarded as many tiny sound-absorbing holes. When sound passes through these holes, friction, viscosity and heat conduction will occur in the holes, thereby converting the sound energy into heat energy and being consumed. This porous sound absorption principle makes the perforated plate 506 have a good absorption efficiency for medium and high frequency noise.

[0038] like Figure 1 , Figure 6 and Figure 7 As shown, the inner arc surface of the through groove 101 is provided with an annular groove, and a partition 6 is fixedly installed in the annular groove inside the through groove 101. The number of partitions 6 is several and they are evenly distributed on the annular groove in the form of an annular array. A silencer cavity 7 is provided between the several partitions 6. The silencer cavity 7 is annularly corresponding to the inside of the through groove 101 and is adapted to the guide sleeve 2. The inner side wall of the partition 6 is a hollow structure. The inner bottom wall of the partition 6 is provided with sound-absorbing cotton 8, and the sound-absorbing cotton 8 is adapted to the silencer cavity 7. The upper surface of the partition 6 is provided with air guide holes 9. The number of air guide holes 9 is several and they are distributed on the partition 6 in the form of a horizontal array. The upper surface of the supporting bottom plate 102 is fixed with a compressor 10 by bolts.

[0039] The more sub-silencer cavities 7 that can be separated, the more combinations of various styles of sub-silencer cavities 7 that can be realized, and the larger the frequency range that can eliminate noise. Therefore, in this embodiment, a plurality of partitions 6 perpendicular to the axial direction of the groove cavity are also provided in the through groove 101. The partitions 6 separate the silencer cavity 7 into multiple independent layers. In this embodiment, two layers of layer plates are used to divide the silencer cavity 7 into three independent layers. The silencer cavity 7 of each layer is divided into several sub-silencer cavities 7 by the partitions 6. In this way, the number of sub-silencer cavities 7 can be maximized, and the frequency range that can eliminate noise can be increased. The number of partitions 6 used can be reasonably set according to the space of the actual product without restriction, and the thickness between each layer can be the same or different.

[0040] The sound-absorbing cotton 8 is pasted on the inner wall of the partition 6, mainly used to absorb high-frequency noise, and at the same time plays a certain role in heat preservation, so as to prevent the humid air downstream of the evaporator from condensing on the fan 3 during cooling. The silencer cavity 7 formed between the partitions 6 is usually a closed or semi-closed space, and its internal shape and structure are designed to reduce noise by using the principles of reflection, interference and absorption of sound waves. When the noise generated by the outdoor unit of the air conditioner enters the silencer cavity 7, it will be reflected and interfered many times in the cavity, so that the energy of the sound is gradually weakened, and effective noise reduction is usually performed for noises of different frequencies. The expansion chamber silencer cavity 7 reflects and interferes with the sound waves in the cavity through the sudden expansion and contraction of the cross section, thereby reducing the noise within a specific frequency range.

[0041] Embodiment 2: Figures 1 to 7 As shown in Comparative Example 1, another embodiment of the present invention is:

[0042] Working principle: the outer shell 1 will have an upper through groove 101 on the front side, and the through groove 101 is in the same plane as the fan 3 and cooperates with the annular groove on the outer shell 1 to form a silencer ring. The fan 3 rotates to generate noise, which passes through the guide sleeve 2 and enters the noise reduction component 4 to perform preliminary noise silencing treatment on the noise. The noise passes through the transfer cover 402 and enters the muffler 405. After being incident on the surface of the porous sound-absorbing material, a part of the noise penetrates into the porous material, causing the air in the pores and slits of the material to vibrate, so that part of the sound energy is converted into heat energy and dissipated. A part of the sound waves is reflected from the surface of the main body 406 of the muffler 405, and is reflected for the second time on the surface of the guide inner cover 501, and returns to the porous sound-absorbing material of the muffler 405 for further attenuation, thereby achieving the function of reducing noise. The outer edge of the main body 406 of the muffler 405 fits with the end face of the main body 403 of the transfer cover 402 to ensure the tightness and sealing of the connection between the two. The extension 407 of the silencer 405 can be connected to the transfer cover 402 by welding, bonding or bolt assembly. The extension 407 of the silencer 405 is fixed by a bolt assembly. Correspondingly, the transfer cover 402 and the extension 407 of the silencer 405 are provided with bolt holes. It should be noted that the outer edge diameter of the main body 406 of the silencer 405 does not exceed the outer edge diameter of the main body 403 to facilitate the installation of the silencer 405. At the same time, the sound waves will enter the guide inner cover 501 after being reflected by the silencer 405, and the noise will flow from the arc-shaped blocking end 509 and the guide inner cover 501 into the chamber integrated with the guide outer cover 504. The porous silencer 503 has a large number of tiny pores inside. When the sound enters these pores, friction, viscosity and heat conduction will occur in the pores, thereby converting the sound energy into heat energy and being consumed. This sound absorption principle enables the porous sound-absorbing plate 503 to effectively absorb the medium and high frequency noise generated by the air-conditioning outdoor unit and reduce the intensity of the noise. At the same time, adding the shockproof end 502 in the middle section of the sound channel can absorb part of the vibration generated by the fan 3. The perforated plates 506 on the front and rear sides have certain elasticity and toughness. When the air-conditioning outdoor unit vibrates, the perforated plates 506 can play a buffering role, absorb part of the vibration energy, and reduce the transmission of vibration to the surrounding environment. Then the sound-absorbing cotton 8 is pasted on the inner wall of the partition 6, which is mainly used to absorb high-frequency noise and play a certain role in heat preservation to prevent the humid air downstream of the evaporator from condensing on the fan 3 during refrigeration. The sound-absorbing chamber 7 formed between each partition 6 is usually a closed or semi-closed space, and its internal shape and structure are designed to reduce noise by using the principles of reflection, interference and absorption of sound waves. When the noise generated by the air-conditioning outdoor unit enters the sound-absorbing chamber 7, it will be reflected and interfered multiple times in the chamber, so that the energy of the sound is gradually weakened, and effective noise reduction is usually performed for noises of different frequencies. The expansion chamber silencer cavity 7 causes the sound waves to reflect and interfere in the cavity through the sudden expansion and contraction of the cross section, thereby reducing the noise within a specific frequency range.

[0043] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1 As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0045] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A noise reduction structure for an air conditioner outdoor unit, characterized in that: The invention comprises a housing (1), a through slot (101) being provided at the front end of the housing (1), a supporting bottom plate (102) being fixedly mounted on the lower surface of the housing (1) by means of bolts, a guide sleeve (2) being fixedly mounted on the back surface of the housing (1) away from the through slot (101), a fan (3) being provided at the front end of the inner arc surface of the guide sleeve (2), and a noise reduction component (4) being provided at one end of the fan (3); The noise reduction component (4) comprises a connecting shaft (401) fixedly mounted on the back of the fan (3); a transfer cover (402) is fixedly mounted on one end of the connecting shaft (401); a main body (403) is provided in the middle of the transfer cover (402); connecting parts (404) are provided on the outer arc surface of the main body (403); skirt parts (408) are provided at the front and rear edges of the transfer cover (402); a muffler (405) is movably connected through one end of the connecting shaft (401); a main body (406) is provided in the middle of the inner arc surface of the muffler (405); and extension parts (407) are provided on the outer arc surface of the main body (406); the extension parts (407) are connected to the skirt part (408) in correspondence; the main body (406) of the muffler (405) is completely covered on the main body (403) of the transfer cover (402).

2. The noise reduction structure of an air conditioner outdoor unit according to claim 1, characterized in that: The outer arc surface of the transfer cover (402) is fixedly sleeved with a silencer assembly (5), the silencer assembly (5) comprising an air guide inner cover (501) fixedly sleeved on the transfer cover (402), a shockproof end (502) being provided at the middle of one side of the air guide inner cover (501), a porous silencer plate (503) being provided at the edge of one side of the outer arc surface of the air guide inner cover (501), the outer arc surface of the air guide inner cover (501) being fixedly connected with an air guide outer cover (504), and a bearing cavity (505) being provided between the air guide outer cover (504) and the air guide inner cover (501).

3. The noise reduction structure of an air conditioner outdoor unit according to claim 2, characterized in that: The inner bottom wall of the bearing cavity (505) is movably sleeved with a perforated plate (506), the number of the perforated plates (506) is two, and the upper and lower sides of the perforated plates (506) are both provided with V-shaped extension ends (507), one of the perforated plates (506) is connected to the front end of the guide inner cover (501), and is movably overlapped on the extension portion (407) through the V-shaped extension end (507).

4. The noise reduction structure of an air conditioner outdoor unit according to claim 3, characterized in that: An arc-shaped stopper end (509) is provided at one end of the guide outer cover (504), and the inner arc surface of the arc-shaped stopper end (509) is overlapped on the other perforated plate (506). A U-shaped portion is provided at the connection between the guide inner cover (501) and the guide outer cover (504), and a sealing ring (508) is fixedly mounted on the guide inner cover (501) and the guide outer cover (504) via the U-shaped portion.

5. The noise reduction structure of an air conditioner outdoor unit according to claim 4, characterized in that: The sealing ring (508) is annularly sleeved on the peripheral side of the fan (3); the outer arc surface of the guide cover (504) is tightly connected to the inner arc surface of the guide sleeve (2); and the inner cavity of the guide sleeve (2) is in the shape of a truncated cone.

6. The noise reduction structure of an air conditioner outdoor unit according to claim 1, characterized in that: The inner arc surface of the through groove (101) is provided with an annular groove, and a partition (6) is fixedly installed in the annular groove inside the through groove (101). The number of the partitions (6) is several and they are evenly distributed on the annular groove in the form of an annular array. A silencer cavity (7) is provided between the several partitions (6), and the silencer cavity (7) is annularly corresponding to the inside of the through groove (101) and is adapted to the guide sleeve (2).

7. The noise reduction structure of an air conditioner outdoor unit according to claim 6, characterized in that: The inner side wall of the partition (6) is a hollow structure, and the inner bottom wall of the partition (6) is provided with sound-absorbing cotton (8), and the sound-absorbing cotton (8) is compatible with the silencing cavity (7).

8. The noise reduction structure of an air conditioner outdoor unit according to claim 7, characterized in that: The upper surface of the partition (6) is provided with air guide holes (9), the number of the air guide holes (9) is a plurality and they are distributed on the partition (6) in the form of a transverse array, and the upper surface of the supporting bottom plate (102) is fixed with a compressor (10) by means of bolts.

9. An air conditioner outdoor unit, comprising the air conditioner outdoor unit noise reduction structure according to any one of claims 1 to 8, characterized in that: The air-conditioning outdoor unit noise reduction structure is at least located at a position opposite to the compressor (10) in the air-conditioning outdoor unit.

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