Fresh air module and air conditioner indoor unit

Abstract

The present invention discloses a fresh air module and an air conditioner indoor unit, relating to the technical field of air conditioning equipment. The fresh air module includes a fresh air housing and a noise reduction structure. A fresh air duct is formed within the fresh air housing. The fresh air housing includes an air outlet portion, which is provided with an air outlet connected to the fresh air duct. The noise reduction structure is arranged along the circumference of the air outlet and forms a noise-reducing air passage at the air outlet. The fresh air module of the present invention can muffle the airflow at the air outlet, reducing noise radiation from the air outlet, thereby improving the air outlet noise of the fresh air module and enhancing user comfort.

Description

Technical Field

[0001] The present invention relates to the technical field of air-conditioning equipment, and in particular to a fresh air module and an air-conditioning indoor unit. Background Art

[0002] To improve indoor air quality, existing air conditioner indoor units are typically equipped with fresh air modules. However, these modules have a small outlet area and high air velocity, resulting in high noise levels at the outlet, which compromises user comfort. To reduce this noise, fresh air modules typically incorporate a noise-reduction structure within the housing. However, this design is structurally difficult to implement and ineffective, while also impacting the module's performance. While reducing noise, it also reduces airflow. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a fresh air module that can reduce the air outlet noise of the fresh air module and enhance user comfort.

[0004] The present invention also provides an air-conditioning indoor unit having the above-mentioned fresh air module.

[0005] According to the first aspect of the present invention, the fresh air module includes: a fresh air shell, a fresh air duct is formed in the fresh air shell, the fresh air shell includes an air outlet portion, and the air outlet portion is provided with an air outlet connected to the fresh air duct; a noise reduction structure, the noise reduction structure is arranged along the circumference of the air outlet, and a noise reduction air passage is formed at the air outlet.

[0006] The fresh air module according to the embodiment of the present invention has at least the following beneficial effects:

[0007] By setting a noise reduction structure at the front end of the air outlet of the fresh air shell, the noise reduction structure is set along the circumference of the air outlet, thereby forming a noise reduction air passage at the air outlet, which can muffle the airflow of the air outlet and reduce the noise radiation of the air outlet, thereby improving the air outlet noise of the fresh air module and enhancing the user's comfort.

[0008] According to some embodiments of the present invention, the noise reduction structure includes a frame and a panel, the panel is provided with perforations, the panel is arranged around the noise reduction air passage and is connected to the frame, and the panel and the frame form a silencer cavity.

[0009] According to some embodiments of the present invention, the frame includes a first end wall and a first surrounding wall arranged around the first end wall, the surrounding panel includes a second surrounding wall and a second end wall extending outward along the circumference of the second surrounding wall, the first end wall and the second end wall are spaced apart and are respectively located at the two ends of the length direction of the noise reduction air passage, the second surrounding wall is evenly distributed with the perforations, and the first end wall, the second end wall, the first surrounding wall and the second surrounding wall form the silencer cavity.

[0010] According to some embodiments of the present invention, the noise reduction structure includes a frame and a baffle, the baffle includes an inner edge portion and an outer edge portion, the inner edge portion is arranged around the noise reduction air passage, and the outer edge portion is connected to the inner circumferential wall of the frame, forming a sound elimination zone between the baffle and the frame.

[0011] According to some embodiments of the present invention, a plurality of the baffles are provided, and the plurality of the baffles are spaced apart along the length direction of the noise reduction airflow channel.

[0012] According to some embodiments of the present invention, the width of the air outlet is L1, the width of the inner edge portion is L2, and L1 and L2 satisfy: L2 ≥ L1.

[0013] According to some embodiments of the present invention, in the direction from the outer edge portion to the inner edge portion, the baffle is arranged to be inclined toward the airflow direction of the noise reduction air passage.

[0014] According to some embodiments of the present invention, the distance between two adjacent resistors gradually decreases in the direction from the inner edge portion to the outer edge portion.

[0015] According to some embodiments of the present invention, a first sound elimination zone is formed between two adjacent resistors and the frame, a second sound elimination zone is formed between the resistor located at the air inlet end of the noise reduction air passage and one end of the frame, and a third sound elimination zone is formed between the resistor located at the air outlet end of the noise reduction air passage and the other end of the frame, and the longitudinal cross-sectional area of the second sound elimination zone is greater than the longitudinal cross-sectional area of the first sound elimination zone, and the longitudinal cross-sectional area of the first sound elimination zone is greater than the longitudinal cross-sectional area of the third sound elimination zone.

[0016] According to some embodiments of the present invention, the longitudinal cross-section of the baffle is a strip cross-section, and the strip cross-section is provided with a first side line and a second side line along the length direction of the noise reduction airflow channel. The radius of the first side line is R1, and the radius of the second side line is R2, and R1 and R2 satisfy: R1>R2.

[0017] According to some embodiments of the present invention, the angle between the line connecting the two end points of the first side line and the length direction of the noise reduction air passage is a1, and the angle between the line connecting the two end points of the second side line and the length direction of the noise reduction air passage is a2, and a1 and a2 satisfy: a1>a2>90°.

[0018] According to some embodiments of the present invention, the fresh air module further includes a sealing ring connected between the air outlet and the noise reduction structure.

[0019] An air-conditioning indoor unit according to an embodiment of the second aspect of the present invention includes the fresh air module described in the embodiment of the first aspect.

[0020] The air conditioner indoor unit according to the embodiment of the present invention has at least the following beneficial effects:

[0021] The fresh air module adopts the first aspect of the embodiment, and a noise reduction structure is set at the front end of the air outlet of the fresh air module. The noise reduction structure is set along the circumference of the air outlet, thereby forming a noise reduction air passage at the air outlet, which can muffle the airflow of the air outlet and reduce the noise radiation of the air outlet, thereby improving the air outlet noise of the fresh air module, reducing the operating noise of the air conditioner indoor unit, and improving the user's comfort.

[0022] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0024] Figure 1 This is a structural diagram of a fresh air module according to an embodiment of the present invention;

[0025] Figure 2 for Figure 1 Exploded diagram of the noise reduction structure;

[0026] Figure 3 for Figure 1 The main schematic diagram of

[0027] Figure 4 for Figure 3 Cross-sectional view of the middle section AA;

[0028] Figure 5 for Figure 3 Cross-sectional view of the middle section BB;

[0029] Figure 6 for Figure 1 Explosion diagram of

[0030] Figure 7This is a structural diagram of a fresh air module according to another embodiment of the present invention;

[0031] Figure 8 for Figure 1 The main schematic diagram of

[0032] Figure 9 for Figure 8 Cross-sectional view of the middle section CC;

[0033] Figure 10 for Figure 8 Cross-sectional view of the middle section DD;

[0034] Figure 11 for Figure 10 Enlarged view of point E in the middle;

[0035] Figure 12 for Figure 7 Explosion diagram of

[0036] Figure 13 This is a structural diagram of an air-conditioning indoor unit according to an embodiment of the present invention;

[0037] Figure 14 The figure shows the distribution diagram of the wind wheel speed and air outlet noise of the fresh air module under three conditions according to an embodiment of the present invention.

[0038] Figure Number:

[0039] Fresh air module 100; fresh air housing 110; air outlet 111; air outlet 112; air outlet grille 113; pipe connector 114; wind wheel 120; fresh air duct 130; noise reduction structure 140; noise reduction air passage 141; frame 142; first air passage 1421; first end wall 1422; first surrounding wall 1423; surrounding plate 143; perforation 1431; second surrounding wall 1432; second end wall 1433; second air passage 1434; muffler chamber 144 ; Resistor 145; Inner edge 1451; Outer edge 1452; Strip cross section 1453; First side line 1454; Second side line 1455; Silencing zone 146; First silencing zone 1461; Second silencing zone 1462; Third silencing zone 1463; Sealing ring 150; First housing 160; Air guide ring 170; Support frame 180; Purification assembly 181; Mounting box 182; Filter 183; Handle 184; Second housing 190; Reinforcement rib 191;

[0040] Indoor unit housing 200;

[0041] Panel 300;

[0042] Fresh air duct 400. DETAILED DESCRIPTION

[0043] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0044] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientation or positional relationship indicated by up, down, etc., are based on the orientation or positional relationship 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 cannot be understood as a limitation on the present invention.

[0045] In the description of the present invention, "a plurality" refers to more than two. The use of "first" or "second" is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of the indicated technical features, or implicitly indicating the order of the indicated technical features.

[0046] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0047] Reference Figure 1 and Figure 13 As shown, a fresh air module 100 of an embodiment of the present invention is used to be installed in an air-conditioning indoor unit. The fresh air module 100 is connected to the outdoors through a fresh air duct 400, and introduces outdoor fresh air into the room to ensure the freshness of the indoor air, reduce the concentration of indoor carbon dioxide, thereby improving the comfort of the indoor environment and enhancing the user experience.

[0048] Reference Figure 1 and Figure 3As shown, a fresh air module 100 according to an embodiment of the present invention includes a fresh air housing 110, a wind wheel 120, and a motor (not shown). A fresh air duct 130 is provided in the fresh air housing 110, the wind wheel 120 is located in the fresh air duct 130, and the motor is drivably connected to the wind wheel 120. The fresh air housing 110 includes an air outlet 111, which is provided with an air outlet 112 connected to the fresh air duct 130. The air outlet 112 is generally located at the front end of the fresh air module 100. When the fresh air module 100 is in operation, the motor drives the wind wheel 120 to rotate, thereby introducing outdoor fresh air into the fresh air duct 130 through the fresh air duct 400, and the fresh air is discharged into the room from the air outlet 112, or discharged together with the heat-exchanged air. Specifically, the extended end of the motor is fixedly connected to the wind wheel 120, which can be connected by a key connection, interference fit, or other means. The other end of the motor, opposite the extended end, is fixedly connected to the fresh air housing 110, thereby stably fixing the wind wheel 120 to the fresh air housing 110 and ensuring the stability of the operation of the wind wheel 120. In addition, the wind wheel 120 can be a centrifugal wind wheel, which has the characteristics of large air volume, high air pressure, and short ventilation time, which is conducive to improving the ventilation efficiency of the fresh air.

[0049] Reference Figure 1 and Figure 7 As shown, the fresh air module 100 of an embodiment of the present invention further includes a noise reduction structure 140, which is provided at the front end of the air outlet 112 and can be fixedly connected to the air outlet portion 111, or fixed to the air outlet portion 111 through a seal or other structure, which is not specifically limited here. Figure 3 、 Figure 4 and Figure 5 As shown, the fresh air flow is blown out from the fresh air duct 130 through the air outlet 112, and the noise reduction structure 140 is arranged along the circumference of the air outlet 112, that is, around the outer periphery of the air outlet 112, thereby forming a noise reduction air passage 141 at the air outlet 112, which can achieve noise reduction after the airflow of the air outlet 112 passes through, reduce the aerodynamic noise of the airflow at the air outlet 112, and reduce the noise radiation of the air outlet 112, thereby improving the air outlet noise of the fresh air module 100 and enhancing the user's comfort. It should be noted that there are many types of noise reduction structures 140, such as perforated silencer structures, laminated silencer structures, resistant silencers or filled with porous sound-absorbing materials, which are not specifically limited here. As long as the noise reduction structure 140 can achieve the purpose of silence the airflow of the air outlet 112, it falls within the protection scope of this embodiment.

[0050] Reference Figure 2 、 Figure 3 、 Figure 4 and Figure 5As shown, in some embodiments of the present invention, the noise reduction structure 140 includes a frame 142 and a panel 143 connected to each other. The frame 142 and the panel 143 can be connected by gluing, snap connection or screw connection, which is not specifically limited here. The shapes of the frame 142 and the panel 143 are adapted to the shape of the air outlet 112. The frame 142 is formed with a first air outlet 1421, and the first air outlet 1421 is located at the front end of the noise reduction air passage 141. The panel 143 is arranged around the noise reduction air passage 141. The panel 143 is connected to the frame 142 at both ends in the front-to-back direction, so that the panel 143 and the frame 142 enclose a silencer chamber 144, which can process the noise generated by the airflow. Specifically, the enclosure 143 is provided with a perforation 1431, and the perforation 1431 is connected to the silencer chamber 144. That is, this embodiment, as an optimization scheme 1, adopts a microporous silencer, also called a perforated silencer structure. The silencer principle is that the enclosure 143 with the perforation 1431 and the frame 142 form a silencer resonance chamber in the circumference of the noise reduction air passage 141. The air flow flowing through the microporous silencer enters the silencer resonance chamber through the micropores, and at the same time forms an air column at the micropores, and resonates with the air flow at the outlet, converting sound energy into heat energy dissipation, reducing the component of audible sound, and achieving the purpose of noise reduction.

[0051] Reference Figure 2 and Figure 4 As shown, in some embodiments of the present invention, the frame 142 includes a first end wall 1422 and a first surrounding wall 1423 arranged around the first end wall 1422, the first end wall 1422 is located at the front end of the noise reduction air passage 141 and has a first air outlet 1421, the enclosure 143 includes a second surrounding wall 1432 and a second end wall 1433 extending outward along the circumference of the second surrounding wall 1432, the second end wall 1433 is located at the rear end of the noise reduction air passage 141 and has a second air outlet 1434, the second air outlet 1434 and the first air outlet 1421 are respectively located at the noise reduction air passage 141 along the length direction ( Figure 2The perforations 1431 are all arranged on the second surrounding wall 1432, and the first end wall 1422, the second end wall 1433, the first surrounding wall 1423 and the second surrounding wall 1432 enclose a silencer chamber 144. When the air outlet 112 is rectangular, the first surrounding wall 1423 and the second surrounding wall 1432 are also constructed as a rectangular structure, so the second surrounding wall 1432 forms four structural surfaces, and the perforations 1431 are evenly distributed on the four structural surfaces. When the air outlet 112 discharges fresh air, the fresh air flow enters the silencer chamber 144 through the first air outlet 1421, and the noise of the fresh air flow is reduced by the microporous silencer, and finally discharged into the room through the second air outlet 1434. The fresh air flow through the noise reduction structure 140 can shift the noise spectrum to high frequency or ultra-high frequency, reduce the audible sound component, thereby reducing noise and improving the comfort of the air outlet of the fresh air module 100. It is understandable that the muffler cavity 144 may also be filled with porous sound-absorbing materials, such as sound-absorbing cotton, foamed silicone, etc., so as to expand the sound absorption range.

[0052] It should be noted that to achieve better sound absorption performance for noise reduction structure 140, the size, aperture ratio, and distribution of perforations 1431 are determined based on the specific frequency band for sound absorption and are also related to the parameter dimensions of impeller 120 and fresh air housing 110. In some embodiments of the present invention, the aperture of perforations 1431 ranges from 1.5 mm to 2.5 mm. Using perforations 1431 within this parameter range effectively reduces the airflow noise of fresh air module 100, achieving better noise reduction.

[0053] Reference Figure 7 As shown, the fresh air module 100 of another embodiment of the present invention includes a fresh air housing 110 and a noise reduction structure 140, wherein the structure of the fresh air housing 110 is the same as that of the previous embodiment, and the introduction of the above embodiment can be appropriately referred to. In order to avoid repetition, no detailed introduction is given here. The noise reduction structure 140 of this embodiment includes a frame 142 and a resistance body 145. The frame 142 and the resistance body 145 are integrally formed, or fixed by gluing, snap connection or screw connection. Figure 8 、 Figure 9 and Figure 10As shown, the shape of the frame 142 matches the shape of the air outlet 112. A first air outlet 1421 is defined at the front end of the frame 142. The baffle 145 is an annular structure, which can be a flat, conical, or curved annular structure, without further limitation. The baffle 145 includes an inner edge 1451 and an outer edge 1452. It should be noted that the inner edge 1451 is the end of the baffle 145 that is closer to the noise reduction air passage 141, while the outer edge 1452 is the end of the baffle 145 that is away from the noise reduction air passage 141. Therefore, the inner edge 1451 surrounds the noise reduction air passage 141, while the outer edge 1452 is connected to the inner circumferential wall of the frame 142, thereby firmly securing the baffle 145 to the frame 142. A sound-absorbing zone 146 is formed between the baffle 145 and the frame 142 to mitigate noise generated by the airflow. Specifically, this embodiment, as optimization solution 2, adopts a laminated silencer. The silencer principle is that along the flow direction of the airflow, the inner wall of the laminated silencer forms a laminated main body, and the airflow is evenly distributed inside the laminated silencer to form air chambers, thereby forming a silencer zone 146 where the gas expands. When the airflow flows through the laminated silencer, the airflow circulates and rolls in the silencer zone 146, reducing the speed of gas overflow, thereby reducing the sound pressure after the gas flows out, and achieving the purpose of noise reduction.

[0054] Reference Figure 10 and Figure 11 As shown, in some embodiments of the present invention, a plurality of resistance bodies 145 are provided in the frame 142, and the plurality of resistance bodies 145 are arranged along the length direction of the noise reduction air passage 141 (ie Figure 10 and Figure 11 The plurality of barriers 145 are connected to the frame 142 and form a plurality of silencer zones 146. The arrangement of the plurality of silencer zones 146 can further reduce the noise of the fresh air flow and enhance the silencer effect on the fresh air flow.

[0055] Reference Figure 10As shown, in some embodiments of the present invention, the impeller 120 drives the airflow of the fresh air duct 130 to be discharged through the air outlet 112 to the noise reduction air passage 141, and the noise is reduced by the noise reduction structure 140. In order to reduce the obstruction of the airflow flowing through the noise reduction air passage 141 by the baffle 145, the width of the air outlet 112 in the left-right direction is L1, and the width of the inner edge 1451 in the left-right direction is L2, satisfying: L2 ≥ L1. Therefore, when the width L2 of the inner edge 1451 in the left-right direction is slightly larger than the width L1 of the air outlet 112 in the left-right direction, the air supply distance of the fresh air module 100 can be guaranteed while achieving noise reduction of the fresh air flow. It is understood that in order to reduce the obstruction caused by the baffle 145 to the airflow flowing through the noise reduction air passage 141 and ensure the air supply distance of the fresh air module 100, the width of the inner edge 1451 of the baffle 145 along the vertical direction should also be slightly larger than the width of the air outlet 112 along the vertical direction. It should be noted that the width in the parameter range described above should be understood in an expanded sense. When the air outlet 112 and the inner edge 1451 are circular, it should be understood that the diameter of the inner edge 1451 is greater than or equal to the diameter of the air outlet 112.

[0056] Reference Figure 11 As shown, in some embodiments of the present invention, in the direction from the outer edge 1452 to the inner edge 1451, the baffle 145 is oriented toward the airflow direction of the noise reduction air passage 141 (i.e. Figure 11 The inclined setting (from the back to the front) can reduce the wind resistance of the fresh air flow when it flows through the obstruction body 145, further reducing the obstruction of the air flow through the noise reduction air passage 141 caused by the obstruction body 145, and ensuring the air supply distance of the fresh air module 100.

[0057] Reference Figure 10 and Figure 11 As shown, in some embodiments of the present invention, along the length direction of the noise reduction air passage 141 (ie Figure 10 and Figure 11Multiple sound-absorbing zones 146 are formed at intervals (in the front-to-back direction). Specifically, a first sound-absorbing zone 1461 is formed between two adjacent resistors 145 and the frame 142. The resistor 145 at the air inlet end of the noise-reducing air passage 141 and one end of the frame 142 form a second sound-absorbing zone 1462. The resistor 145 at the air outlet end of the noise-reducing air passage 141 and the other end of the frame 142 form a third sound-absorbing zone 1463. The plane passing through the central axis of the noise-reducing air passage 141 is defined as a longitudinal plane, and the cross-section of the longitudinal plane through the resistor 145 is a longitudinal section. Further, the longitudinal cross-sectional area of the second sound-absorbing zone 1462 is greater than that of the first sound-absorbing zone 1461, and the longitudinal cross-sectional area of the first sound-absorbing zone 1461 is greater than that of the third sound-absorbing zone 1463. It is understandable that after the fresh air is discharged from the air outlet 112, it enters the noise reduction air passage 141. Therefore, the wind speed is the highest at the second silencer zone 1462 located on the air inlet side of the noise reduction air passage 141, and the wind speed at the third silencer zone 1463 located on the air outlet side of the noise reduction air passage 141 is lower than the wind speeds in the first silencer zone 1461 and the second silencer zone 1462. Because the larger the area of the silencer zone 146, the better its sound absorption effect, the noise reduction structure 140 of this embodiment adopts the above structure, which can preferentially absorb the noise on the air inlet side of the noise reduction air passage 141 by the first silencer zone 1461, and then gradually be absorbed by the second silencer zone 1462 and the third silencer zone 1463 during the flow process, thereby achieving a better noise reduction effect and reducing the air outlet noise of the fresh air module 100.

[0058] Reference Figure 11 As shown, in some embodiments of the present invention, a plurality of baffles 145 are provided along the front-to-back direction, and the plurality of baffles 145 are evenly distributed along the front-to-back direction. In the direction from the inner edge 1451 to the outer edge 1452, the distance between two adjacent baffles 145 gradually decreases, that is, the height dimension of the muffler zone 146 close to the airflow side (i.e., along the Figure 11 The front-to-back direction) is greater than the height dimension of the muffler zone 146 away from the airflow side (i.e., along Figure 11 Therefore, the airflow through the noise reduction air passage 141 flows from the inner edge portion 1451 into the muffler zone 146, thereby reducing the sound pressure of the airflow flowing out of the outer edge portion 1452 and improving the noise reduction effect.

[0059] Reference Figure 11 As shown, in some embodiments of the present invention, the longitudinal section of the baffle 145 is a strip section 1453, and the strip section 1453 is along the length direction of the noise reduction air passage 141 (ie Figure 11The strip cross section 1453 is an arc-shaped structure, and the height dimension of the muffler area 146 on the side close to the airflow between the stacked baffles 145 (i.e., along the direction of the airflow) is large enough to accommodate the first side line 1454 and the second side line 1455. The radius R1 of the first side line 1454 is greater than the radius R2 of the second side line 1455. When the parameter value R1>R2 is satisfied, the strip cross section 1453 is an arc-shaped structure, and the height dimension of the muffler area 146 on the side close to the airflow between the stacked baffles 145 (i.e., along the direction of the airflow) is large enough to accommodate the first side line 1454 and the second side line 1455. Figure 11 The front-to-back direction) is greater than the height dimension of the muffler zone 146 away from the airflow side (i.e., along Figure 11 The front-to-back direction in the air passage 141 facilitates the airflow through the noise reduction portion 1451 to flow into the silencer zone 146, thereby reducing the sound pressure of the airflow flowing out of the outer edge portion 1452, so that the fresh air module 100 can obtain a better noise reduction effect.

[0060] Reference Figure 11 As shown, in some embodiments of the present invention, it is necessary to further explain that the line connecting the two end points of the first side line 1454 and the length direction of the noise reduction air passage 141 (ie Figure 11 The angle between the front and rear directions in the second side line 1455 and the length direction of the noise reduction air passage 141 (ie Figure 11 The angle between the front and rear directions is a2, and a1 and a2 satisfy the following: a1>a2>90°. When the above parameter values are met, the height dimension of the muffler area 146 close to the airflow side between the stacked baffles 145 (i.e., along the Figure 11 The front-to-back direction) is greater than the height dimension of the muffler zone 146 away from the airflow side (i.e., along Figure 11 The front-to-back direction in the air passage 141 facilitates the airflow through the noise reduction portion 1451 to flow into the silencer zone 146, thereby reducing the sound pressure of the airflow flowing out of the outer edge portion 1452, so that the fresh air module 100 can obtain a better noise reduction effect.

[0061] Reference Figure 10 and Figure 11 As shown, in some embodiments of the present invention, the frame 142 and the baffle 145 are integrally formed and can be processed using 3D printing technology, resulting in a stable structure, high processing precision, and improved processing efficiency. In addition, the frame 142 and the baffle 145 can be made of plastic, which is easy to process and has low processing costs.

[0062] Reference Figure 4 and Figure 10As shown, in some embodiments of the present invention, the fresh air module 100 also includes a sealing ring 150, which is connected between the air outlet 111 and the noise reduction structure 140, and is used to seal the air outlet 111 and the noise reduction structure 140, so that the air outlet 112 is sealed and connected with the noise reduction air passage 141, so that the fresh air flow can pass through the noise reduction structure 140 to the maximum extent before being discharged, thereby reducing the air outlet noise of the fresh air module 100; and avoiding the fresh air module 100 from discharging the fresh air flow from the side of the air outlet 112.

[0063] Reference Figure 14 As shown in FIG, when other parameters of the fresh air module 100 remain unchanged, the noise of the fresh air module 100 is measured under different rotation speeds of the wind wheel 120 for the original solution (i.e., without the noise reduction structure 140), optimized solution 1 (i.e., with the microporous silencer solution), and optimized solution 2 (i.e., with the laminated silencer solution). Figure 14 It can be seen that at the same rotational speed, the noise reduction structure 140 provided at the air outlet 112 of the fresh air module 100 can effectively reduce the airflow noise. Specifically, at the same rotational speed of the impeller 120, the noise reduction structure 140 reduces the airflow noise by approximately 1.5 dBA compared to the fresh air module 100 without the noise reduction structure 140.

[0064] Reference Figure 6 and Figure 12As shown, in some embodiments of the present invention, the fresh air housing 110 includes a first housing 160, an air guide ring 170, a support frame 180, and a second housing 190 connected in sequence along the left-right direction. The first housing 160 and the air guide ring 170, the air guide ring 170 and the support frame 180, and the support frame 180 and the second housing 190 can be connected by means of snaps or screws, etc., which are not specifically limited here. The fresh air module 100 also includes a purification component 181. The first housing 160 and the air guide ring 170 define a space for the air wheel 120 to be rotatably connected, and the support frame 180 and the second housing 190 define a space for the purification component 181 to be installed. In addition, the purification component 181 is used to purify the airflow entering the fresh air duct 130, that is, to filter, remove dust or disinfect the fresh air outside, etc., which are not specifically limited here, thereby improving the cleanliness of the air entering the indoor environment. It is understood that the purification component 181 can be an electrostatic purification module, a high-efficiency particulate air filter (also known as a HEPA mesh, High Efficiency Particulate Air Filter), an activated carbon filter, or other structures, and is not specifically limited here. The purification component 181 generally uses a high-efficiency air filter, which uses a filter that meets HEPA standards and has an efficiency of 99.7% for 0.1 micron and 0.3 micron particles. The characteristic of the HEPA mesh is that air can pass through, but fine particles cannot pass through. The HEPA mesh has a removal efficiency of over 99.97% for particles with a diameter of 0.3 micron or more, making it the most effective filtering medium for pollutants such as smoke, dust, and bacteria.

[0065] In some embodiments of the present invention, the purification component 181 includes a mounting box 182 and a filter 183. The mounting box 182 is detachably connected to the support frame 180, which facilitates the replacement of the filter 183. In addition, the filter 183 is detachably connected to the mounting box 182 and can be separated from the mounting box 182, which facilitates the user to replace the filter 183. Figure 6 and Figure 12 As shown, a handle 184 is provided on the side of the installation box 182 away from the support frame 180, which is convenient for the user to disassemble the installation box 182 and improve the convenience of replacing the filter 183. Figure 6 As shown, the mounting box 182 is tilted in the left and right directions, so that the contact area between the filter 183 and the airflow is increased while the size of the fresh air module 100 in the up and down directions remains unchanged, thereby increasing the air inlet area and improving the air output of the fresh air module 100.

[0066] Reference Figure 1 and Figure 7As shown, in some embodiments of the present invention, the outer wall surface of the second shell 190 is formed with a reinforcing rib 191, which can improve the structural strength of the second shell 190, thereby improving the strength of the fresh air module 100 and making the operation of the fresh air module 100 more stable. Figure 1 As shown, the air outlet portion 111 further includes an air outlet grille 113 provided at the air outlet 112. The air outlet grille 113 can prevent hands from reaching into the air outlet 112, thus providing a safety protection. Furthermore, the air outlet grille 113 also has an air guide function, directing the fresh air flow from the air outlet 112 at a fixed angle, thereby improving the air outlet effect of the fresh air module 100.

[0067] Reference Figure 7 As shown, the fresh air housing 110 further includes a pipe connector 114 , one end of which is connected to the fresh air duct 130 , and the other end is connected to the fresh air pipe 400 , so that the connection of the fresh air pipe 400 is more stable and convenient for installation and transportation.

[0068] Reference Figure 13 As shown, an air conditioning indoor unit according to an embodiment of the present invention includes the fresh air module 100 of the above embodiment. The air conditioning indoor unit also includes an indoor unit housing 200 and a panel 300, and the fresh air housing 110 is arranged in the indoor unit housing 200. Figure 6 and Figure 12 As shown, the noise reduction structure 140 can be installed on the panel 300, and the sealing ring 150 can be fixedly connected to the panel 300. The front end of the sealing ring 150 is provided with a card slot (not shown in the figure), and the noise reduction structure 140 is fixed to the card slot. The card slot and the noise reduction structure 140 are squeezed to achieve sealing. The installation structure is stable and the sealing effect is good.

[0069] Reference Figure 13 As shown, an air conditioner indoor unit according to an embodiment of the present invention adopts the fresh air module 100 of the first embodiment. Figure 1 As shown, the fresh air module 100 is provided with a noise reduction structure 140 at the front end of the air outlet 112 of the fresh air module 100. The noise reduction structure 140 is arranged along the circumference of the air outlet 112, thereby forming a noise reduction air passage 141 at the air outlet 112, which can achieve sound elimination and noise reduction after the airflow of the air outlet 112 passes through, reduce the aerodynamic noise of the airflow at the air outlet 112, and reduce the noise radiation of the air outlet 112, thereby improving the air outlet noise of the fresh air module 100, reducing the operating noise of the air conditioner indoor unit, and improving the user's comfort.

[0070] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the scope of the present invention.

Claims

1. Fresh air module, characterized in that: include: A fresh air housing is formed with a fresh air duct therein, and the fresh air housing includes an air outlet portion, and the air outlet portion is provided with an air outlet communicating with the fresh air duct; A noise reduction structure, wherein the noise reduction structure is arranged along the circumference of the air outlet, and a noise reduction wind passage is formed at the air outlet; the noise reduction structure includes a frame and a baffle, the baffle includes an inner edge portion and an outer edge portion, the inner edge portion is arranged around the noise reduction wind passage, the outer edge portion is connected to the inner circumferential wall of the frame, and a sound elimination zone is formed between the baffle and the frame; the longitudinal section of the baffle is a strip section, and the strip section is provided with a first side line and a second side line along the length direction of the noise reduction wind passage, the radius of the first side line is R1, the radius of the second side line is R2, and R1 and R2 satisfy: R1>R2.

2. The fresh air module according to claim 1, characterized in that: There are multiple baffles, and the multiple baffles are arranged at intervals along the length direction of the noise reduction airflow channel.

3. The fresh air module according to claim 1, characterized in that: The width of the air outlet is L1, the width of the inner edge is L2, and L1 and L2 satisfy: L2 ≥ L1.

4. The fresh air module according to claim 3, characterized in that: In a direction from the outer edge portion to the inner edge portion, the baffle is arranged to be inclined toward an airflow direction of the noise reduction air passage.

5. The fresh air module according to claim 2, characterized in that: In a direction from the inner edge portion to the outer edge portion, a distance between two adjacent resistors gradually decreases.

6. The fresh air module according to claim 2, characterized in that: A first sound elimination zone is formed between two adjacent resistors and the frame, the resistor located at the air inlet end of the noise reduction air passage and one end of the frame form a second sound elimination zone, and the resistor located at the air outlet end of the noise reduction air passage and the other end of the frame form a third sound elimination zone, the longitudinal cross-sectional area of the second sound elimination zone is greater than the longitudinal cross-sectional area of the first sound elimination zone, and the longitudinal cross-sectional area of the first sound elimination zone is greater than the longitudinal cross-sectional area of the third sound elimination zone.

7. The fresh air module according to claim 1, characterized in that: The angle between the line connecting the two end points of the first side line and the length direction of the noise reduction air passage is a1, and the angle between the line connecting the two end points of the second side line and the length direction of the noise reduction air passage is a2, and a1 and a2 satisfy: a1>a2>90°.

8. The fresh air module according to any one of claims 1 to 7, characterized in that: The fresh air module further includes a sealing ring connected between the air outlet and the noise reduction structure.

9. The fresh air module according to claim 8, characterized in that: The fresh air module is applied to an air conditioner indoor unit, which includes an indoor unit housing and a panel. The fresh air housing is arranged in the indoor unit housing, the noise reduction structure is installed on the panel, and the sealing ring is fixedly connected to the panel.

10. The fresh air module according to claim 9, characterized in that: A clamping groove is provided at the front end of the sealing ring, and the noise reduction structure is clamped and fixed to the clamping groove.

11. Air conditioner indoor unit, characterized by: Comprising the fresh air module according to any one of claims 1 to 10.

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