Fresh air device and air conditioner

Abstract

The application provides a fresh air device and an air conditioner, wherein the fresh air device comprises: a volute, a first shell which forms a cavity together with the volute, the first shell being provided with an air inlet which is in communication with the cavity; and a second shell which is located on the side of the first shell away from the volute and forms a second sound absorption cavity together with the first shell; wherein the first shell is provided with a plurality of first through holes which are used for communicating the cavity and the second sound absorption cavity. By forming the second sound absorption cavity on the side of the first shell away from the volute and communicating the cavity and the second sound absorption cavity through the first through holes, the second sound absorption cavity can absorb low-frequency noise, the noise attenuation capability can be improved, and the mute performance can be improved.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to a fresh air device and an air conditioner. Background Technology

[0002] During the operation of a fresh air system, the aerodynamic noise generated by the high-speed rotation of the fan is an important factor affecting the user experience. Traditional noise reduction designs mainly rely on sound-absorbing cotton and air guide plates set in the air inlet housing, which are insufficient for attenuating low-frequency noise and need further improvement. Utility Model Content

[0003] This utility model provides a fresh air device and an air conditioner to solve the technical problem of weak low-frequency noise attenuation capability.

[0004] To achieve the above objectives, this application proposes a fresh air device, comprising:

[0005] Snail shell:

[0006] A first housing, which, together with the volute, forms a cavity, and the first housing is provided with an air inlet communicating with the cavity; and,

[0007] The second housing is located on the side of the first housing away from the volute, and together with the first housing, forms a second sound-absorbing cavity;

[0008] The first housing is provided with a plurality of first through holes, which are used to connect the cavity and the second sound-absorbing cavity.

[0009] Optionally, in one embodiment, a partition is provided inside the first housing, the partition and the inner wall of the first housing enclose a first sound-absorbing cavity, the first sound-absorbing cavity is disposed opposite to the air inlet, the first through hole connects the first sound-absorbing cavity and the second sound-absorbing cavity, the partition is provided with a plurality of second through holes, the plurality of second through holes connect the first sound-absorbing cavity and the cavity.

[0010] Optionally, in one embodiment, a plurality of the second through holes are located on the side of the partition facing the volute.

[0011] Optionally, in one embodiment, the partition includes a first partition portion and a second partition portion connected to each other. The first partition portion is disposed opposite to the air inlet, and the surface of the first partition portion facing the air inlet is provided with a guide arc surface. The second partition portion is located on the side of the first partition portion away from the air inlet.

[0012] Optionally, in one embodiment, the partition is provided with a slot, and the inner wall of the first housing is provided with a buckle, which engages with the slot.

[0013] Optionally, in one embodiment, the first sound-absorbing cavity is provided with a first sound-absorbing body, which is used for sound absorption.

[0014] Optionally, in one embodiment, the first sound-absorbing body is provided with a limiting groove, and the inner wall of the first housing is provided with a limiting strip, the limiting strip being embedded in the limiting groove, and the extending direction of the limiting groove being the same as the snapping direction of the buckle.

[0015] Optionally, in one embodiment, the second housing includes a shielding portion and a retaining ring disposed around the shielding portion, the shielding portion being detachably connected to one side of the retaining ring, and the other side of the retaining ring being connected to the first housing.

[0016] Optionally, in one embodiment, the second sound-absorbing cavity is provided with a second sound-absorbing body, which is used for sound absorption.

[0017] This application also proposes an air conditioner, including the fresh air device as described above.

[0018] The fresh air device provided in this application forms a second sound-absorbing cavity on the side of the first housing away from the volute, and connects the cavity and the second sound-absorbing cavity through a first through hole, thereby achieving the absorption of low-frequency noise by the second sound-absorbing cavity, improving noise attenuation capability, and improving quiet performance. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the fresh air device of this application from one of the views.

[0021] Figure 2 This is a structural schematic diagram of the fresh air device of this application from another perspective;

[0022] Figure 3 This is an exploded view of the fresh air system in this application;

[0023] Figure 4 This is a schematic diagram of the structure of the partition in this application;

[0024] Figure 5 This is a schematic diagram of the structure of the partition and the first sound absorber in this application;

[0025] Figure 6 This is a side view of the fresh air device of this application;

[0026] Figure 7 For along Figure 6 A sectional view from a three-dimensional perspective obtained by section line II;

[0027] Figure 8 This is a bottom view of the first and second housings in this application from one of the three-dimensional perspectives;

[0028] Figure 9 This is a bottom view of the first and second housings in this application from another stereoscopic perspective;

[0029] Figure 10 This is an exploded view of the second shell in this application;

[0030] Figure 11 This is a bottom view of the fresh air device in this application;

[0031] Figure 12 For along Figure 11 A sectional view from a three-dimensional perspective obtained by section line II-II.

[0032] Explanation of icon numbers:

[0033] 1. First housing; 11. Air inlet; 12. First through hole; 13. Buckle; 14. Limiting strip; 2. Second housing; 21. Shielding part; 211. Locking block; 22. Retaining ring; 221. Locking ring; 3. Volute; 4. Second sound absorption cavity; 41. Second sound absorber; 5. Partition; 51. First partition; 511. Guide arc surface; 512. Slot; 52. Second partition; 53. Second through hole; 6. First sound absorption cavity; 61. First sound absorber; 611. Limiting groove; 7. Filter frame; 8. Fan.

[0034] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model.

[0036] In the description of this application, it should be understood that the terms "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this application and for simplification, and do not indicate or imply that the device or element referred to must have a unique orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0039] The use of "applies to" or "configured to" in this application implies open and inclusive language, which does not exclude the applicability to or configuration to devices performing additional tasks or steps. Additionally, the use of "based on" implies openness and inclusivity, because processes, steps, calculations, or other actions "based on" one or more of the stated conditions or values ​​may in practice be based on additional conditions or values ​​beyond those stated.

[0040] In this application, the term "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be made without using these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0041] This application provides a fresh air device to address the problem of weak low-frequency noise attenuation capability. The following description will be provided in conjunction with the accompanying drawings.

[0042] In the embodiments of this application, such as Figure 1 , Figure 2 as well as Figure 3 As shown, the fresh air system includes:

[0043] Snail shell 3:

[0044] The first housing 1, together with the volute 3, forms a cavity; the first housing 1 is provided with an air inlet 11 communicating with the cavity; and,

[0045] The second housing 2 is located on the side of the first housing 1 away from the volute 3, and together with the first housing 1, forms the second sound-absorbing cavity 4;

[0046] The first housing 1 is provided with a plurality of first through holes 12, which are used to connect the cavity and the second sound-absorbing cavity 4.

[0047] It should be noted that in the fresh air device, the volute 3 refers to the housing used to accommodate the centrifugal fan 8. Therefore, the cavity formed by the first housing 1 and the volute 3 refers to the space used to accelerate the airflow after it enters. The airflow enters the cavity through the air inlet 11 on the first housing 1, with part of the airflow flowing towards the volute 3 and part of the airflow flowing towards the second sound-absorbing cavity 4 through the first through hole 12.

[0048] It is understandable that in related technologies, the air intake cavity of a fresh air system is usually equipped with sound-absorbing cotton. The sound-absorbing cotton is positioned relative to the air inlet 11 of the air intake cavity, so it mainly absorbs high-frequency noise, but its ability to attenuate low-frequency noise is insufficient, resulting in the existence of some aerodynamic noise, which affects the user experience.

[0049] In this embodiment, a second sound-absorbing cavity 4 is provided on the side of the first housing 1 opposite to the volute 3, and part of the airflow in the cavity is guided into the second sound-absorbing cavity 4 through the first through hole 12. This allows part of the airflow to be reflected and absorbed within the second sound-absorbing cavity 4, attenuating the low-frequency noise generated by the airflow and improving the quietness of the fresh air device. It should be noted that high-frequency noise and low-frequency noise are relative concepts, not referring to a specific frequency band as high-frequency or low-frequency. For example, if 0-400Hz is considered low-frequency, then above 400Hz is considered high-frequency.

[0050] In some embodiments, such as Figure 3 , Figure 4 as well as Figure 5As shown, a partition 5 is provided inside the first housing 1. The partition 5 and the inner wall of the first housing 1 enclose a first sound-absorbing cavity 6. The first sound-absorbing cavity 6 is arranged opposite to the air inlet 11. The first through hole 12 connects the first sound-absorbing cavity 6 and the second sound-absorbing cavity 4. The partition 5 is provided with a plurality of second through holes 53. The plurality of second through holes 53 connect the first sound-absorbing cavity 6 and the cavity.

[0051] It should be noted that the first sound-absorbing cavity 6 is located in the air inlet direction of the air inlet 11.

[0052] Understandably, through multiple second through-holes 53, some airflow enters the first sound-absorbing cavity 6 and is reflected within it, thereby absorbing the dynamic noise of the airflow that has just entered the cavity. For example... Figure 11 as well as Figure 12 As shown, along the axial direction of the fan 8 of the fresh air device, the first sound absorption cavity 6 and the second sound absorption cavity 4 have a similar L-shaped structure. Through the first through hole 12, the airflow can flow between the first sound absorption cavity 6 and the second sound absorption cavity 4, achieving a synergistic noise reduction effect.

[0053] For example, the second through hole 53 can be located on the side of the partition 5 facing the air inlet 11, or on the side of the partition 5 facing the volute 3.

[0054] In some embodiments, such as Figure 3 As shown, multiple second through holes 53 are located on the side of the partition 5 facing the volute 3.

[0055] It should be noted that multiple first through holes 12 and multiple second through holes 53 are arranged opposite each other along the axial direction of the fan 8 of the fresh air device.

[0056] It is understandable that, through the second through hole 53 located on the side of the baffle 5 facing the volute 3, on the one hand, the airflow that has just entered the cavity is difficult to directly enter the first sound-absorbing cavity 6, reducing airflow loss, and on the other hand, some airflow enters the second sound-absorbing cavity 4, reducing airflow power.

[0057] In some embodiments, such as Figure 5 , Figure 6 and Figure 7 As shown, the baffle 5 includes a first baffle portion 51 and a second baffle portion 52 connected to each other. The first baffle portion 51 is disposed opposite to the air inlet 11. A guide arc surface 511 is provided on the surface of the first baffle portion 51 facing the air inlet 11. The second baffle portion 52 is located on the side of the first baffle portion 51 away from the air inlet 11.

[0058] It should be noted that the flow-guiding arc surface 511 refers to the surface being arc-shaped.

[0059] It is understandable that the airflow is reflected and changes its flow path on the guide arc surface 511, which has the functions of guiding flow and reducing noise.

[0060] As can be seen from other embodiments, the second partition portion 52 facing the volute 3 is provided with a plurality of second through holes 53.

[0061] In some embodiments, such as Figure 5 As shown, the partition 5 is provided with a slot 512, and the inner wall of the first housing 1 is provided with a buckle 13, which engages with the slot 512.

[0062] It is understandable that the buckle 13 and the slot 512 are used to achieve the detachable connection of the partition 5 in the first housing 1, which makes it easy to clean the dust on the partition 5 and ensure the cleanliness of the fresh air.

[0063] For example, multiple buckles 13 and slots 512 are provided in a one-to-one correspondence. The two ends of the first partition 51 are bent to form side plates facing the inner wall of the first housing 1, and each side plate is provided with a slot 512. The buckles 13 gradually become smaller along the direction from the first housing 1 to the volute 3, so that the slots 512 can be fitted onto the buckles 13 along the direction from the volute 3 to the first housing 1.

[0064] In some embodiments, such as Figure 5 As shown, the first sound-absorbing cavity 6 is provided with a first sound-absorbing body 61, which is used for sound absorption. The material of the first sound-absorbing body 61 is sound-absorbing cotton or sponge.

[0065] It should be noted that sound-absorbing cotton is a type of man-made inorganic fiber. It is made primarily from natural minerals such as quartz sand, limestone, and dolomite, combined with chemical raw materials such as soda ash and borax, melted into a glass-like consistency. In its molten state, it is then blown or spun into flocculent fine fibers using external force. These fibers are three-dimensionally intertwined, creating numerous tiny gaps between them.

[0066] Understandably, based on the shape of the first sound-absorbing cavity 6, sound-absorbing cotton is used to construct a similar shape, utilizing the small gaps in the sound-absorbing cotton to achieve airflow reflection and absorption.

[0067] In some embodiments, such as Figure 5 , Figure 8 as well as Figure 9 As shown, the first sound absorber 61 is provided with a limiting groove 611, and the inner wall of the first housing 1 is provided with a limiting strip 14. The limiting strip 14 is embedded in the limiting groove 611, and the extending direction of the limiting groove 611 is the same as the snapping direction of the buckle 13.

[0068] It should be noted that the partition 5 surrounds at least a portion of the first sound absorber 61 but does not surround the limiting groove 611.

[0069] Understandably, the cooperation between the limiting strip 14 and the limiting groove 611 improves the installation stability of the first sound absorber 61 in the first sound absorption cavity 6, reducing unnecessary shaking caused by airflow. For example, as the buckle 13 gradually decreases in size along the direction from the first housing 1 to the volute 3, the snapping direction of the buckle 13 is from the volute 3 to the first housing 1. Multiple limiting grooves 611 and limiting strips 14 are provided in a one-to-one correspondence.

[0070] In some embodiments, such as Figure 10 As shown, the second housing 2 includes a shielding part 21 and a retaining ring 22 disposed around the shielding part 21. The shielding part 21 is detachably connected to one side of the retaining ring 22, and the other side of the retaining ring 22 is connected to the first housing 1.

[0071] It should be noted that the shielding part 21, the retaining ring 22, and at least a portion of the first housing 1 enclose and form the second sound-absorbing cavity 4. Detachable connections include common connection methods such as snap-fit ​​and bolted connections.

[0072] It is understandable that the second sound-absorbing cavity 4 can be cleaned by the shielding part 21 that is detachably connected to the baffle ring 22, so as to avoid dust clogging the first through hole 12 and ensure the noise reduction effect of the second sound-absorbing cavity 4.

[0073] In some embodiments, such as Figure 10 As shown, the blocking part 21 is provided with multiple locking blocks 211, and the retaining ring 22 is provided with multiple retaining rings 221. The multiple locking blocks 211 and the multiple retaining rings 221 are locked in a one-to-one correspondence. Along the direction from the first housing 1 to the blocking part 21, the locking blocks 211 gradually become larger.

[0074] It is understandable that the shielding part 21 is stably installed through multiple locking blocks 211 and multiple retaining rings 221. Furthermore, the size variation of the locking blocks 211 facilitates their smooth insertion into the retaining rings 221 and makes it difficult for the locking blocks 211 to disengage from the retaining rings 221.

[0075] In some embodiments, for the noise cancellation band f of the second sound-absorbing cavity 4 o It can be obtained using the following formula:

[0076]

[0077] Where L is the thickness of the second sound-absorbing cavity 4, t is the thickness of the plate where the first through hole 12 is located, d is the diameter of the first through hole 12, c is the sound velocity, P is the perforation rate, and the perforation rate = perforation area / total area × 100%.

[0078] Understandably, the above formula can be used to calculate the noise frequency band that can be attenuated, and then the design can be modified in conjunction with the actual product.

[0079] In some embodiments, such as Figure 10As shown, the second sound-absorbing cavity 4 is provided with a second sound-absorbing body 41, which is used for sound absorption. The material of the second sound-absorbing body 41 is sound-absorbing cotton or sponge.

[0080] It should be noted that sound-absorbing cotton is a type of man-made inorganic fiber. It is made primarily from natural minerals such as quartz sand, limestone, and dolomite, combined with chemical raw materials such as soda ash and borax, melted into glass. In its molten state, it is blown and spun into flocculent fine fibers by external force. The fibers are three-dimensionally intertwined, creating numerous tiny gaps. In this embodiment, both the second sound absorber 41 and the first sound absorber 61 are made of sound-absorbing cotton, but their shapes differ.

[0081] Understandably, the small gaps in the second sound absorber 41 can reflect and absorb airflow, improving the noise reduction effect of the second sound absorption cavity 4. Furthermore, the shielding part 21 can be removed from the retaining ring 22 to replace the second sound absorber 41.

[0082] In some embodiments, such as Figure 3 As shown, the fresh air device also includes a filter frame 7 and a fan 8. The filter frame 7 is disposed between the volute 3 and the first housing 1, and the fan 8 is disposed inside the volute 3.

[0083] This application also provides an air conditioner that includes the above-mentioned fresh air device. The specific structure of the fresh air device is as described in the above embodiments. Since this air conditioner adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0084] In some embodiments, the air conditioner is an indoor unit, or it may include both an indoor unit and an outdoor unit.

[0085] The noise level of the fresh air device provided in this application embodiment was measured in the 0-3000Hz frequency band. In the 0-400Hz frequency band, the noise level of the fresh air device provided in this application is lower. In the frequency band above 400Hz, the noise level of the fresh air device provided in this application is also generally lower than that in related technologies, indicating that the first sound-absorbing cavity 6 and the second sound-absorbing cavity 4 have a synergistic noise reduction effect. Furthermore, it should be noted that in some frequency ranges, although the reduction is only a few decibels, in a quiet environment (typically referring to indoor noise of 20-40dB), a difference of 1dB will be perceptible to the human ear, thus achieving a good noise reduction effect.

[0086] In the above embodiments, the descriptions of each embodiment have different focuses. Parts not described in detail in a particular embodiment can be referred to in the relevant descriptions of other embodiments. In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0087] The fresh air device and air conditioner provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A fresh air device, characterized in that, include: Snail shell (3): The first housing (1) is enclosed with the volute (3) to form a cavity, and the first housing (1) is provided with an air inlet (11) communicating with the cavity; as well as, The second housing (2) is located on the side of the first housing (1) away from the volute (3) and forms a second sound-absorbing cavity (4) with the first housing (1); The first housing (1) is provided with a plurality of first through holes (12), which are used to connect the cavity with the second sound-absorbing cavity (4).

2. The fresh air device according to claim 1, characterized in that, A partition (5) is provided inside the first housing (1). The partition (5) and the inner wall of the first housing (1) enclose a first sound-absorbing cavity (6). The first sound-absorbing cavity (6) is disposed opposite to the air inlet (11). The first through hole (12) connects the first sound-absorbing cavity (6) and the second sound-absorbing cavity (4). The partition (5) is provided with a plurality of second through holes (53). The plurality of second through holes (53) connect the first sound-absorbing cavity (6) and the cavity.

3. The fresh air device according to claim 2, characterized in that, Multiple second through holes (53) are located on the side of the partition (5) facing the volute (3).

4. The fresh air device according to claim 3, characterized in that, The partition (5) includes a first partition (51) and a second partition (52) connected to each other. The first partition (51) is disposed opposite to the air inlet (11). The surface of the first partition (51) facing the air inlet (11) is provided with a guide arc surface (511). The second partition (52) is located on the side of the first partition (51) away from the air inlet (11).

5. The fresh air device according to claim 3, characterized in that, The partition (5) is provided with a slot (512), and the inner wall of the first housing (1) is provided with a buckle (13), which engages with the slot (512).

6. The fresh air device according to claim 5, characterized in that, The first sound-absorbing cavity (6) is provided with a first sound-absorbing body (61), which is used for sound absorption.

7. The fresh air device according to claim 6, characterized in that, The first sound absorber (61) is provided with a limiting groove (611), and the inner wall of the first housing (1) is provided with a limiting strip (14). The limiting strip (14) is embedded in the limiting groove (611), and the extending direction of the limiting groove (611) is the same as the snapping direction of the buckle (13).

8. The fresh air device according to claim 1, characterized in that, The second housing (2) includes a shielding part (21) and a retaining ring (22) disposed around the shielding part (21). The shielding part (21) is detachably connected to one side of the retaining ring (22), and the other side of the retaining ring (22) is connected to the first housing (1).

9. The fresh air device according to any one of claims 1-8, characterized in that, The second sound-absorbing cavity (4) is provided with a second sound-absorbing body (41), which is used for sound absorption.

10. An air conditioner, characterized in that, Includes the fresh air device as described in any one of claims 1-9.

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