An air conditioner indoor unit

Abstract

The application relates to the household electrical appliance technical field and discloses an indoor air conditioner, which comprises a casing and a fresh air module, the fresh air module is arranged in the casing, the fresh air module comprises a heat exchange core arranged in a heat exchange cavity to perform heat exchange on indoor turbid wind and outdoor fresh air flowing through the heat exchange cavity, the heat exchange core is internally provided with a fresh air flow channel, the fresh air flow channel is provided with a fresh air heat exchange air outlet; a fresh air outlet guide part is connected to the heat exchange core shell, one end of the fresh air outlet guide part is communicated with the heat exchange cavity, and the other end is provided with a fresh air outlet, the fresh air outlet is used for communicating with an indoor space, a plurality of sound absorbing holes are arranged on the side wall of the fresh air outlet guide part, and at least part of the sound absorbing holes is opposite to the fresh air heat exchange air outlet; a sound absorbing box is arranged on the outer wall of the fresh air outlet guide part, a sound absorbing cavity is formed in the sound absorbing box, the sound absorbing cavity is communicated with the sound absorbing holes; and a sound absorbing piece is arranged in the sound absorbing cavity, the sound absorbing piece is used for absorbing noise, can reduce the noise of the fresh air module, and saves space.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, and more particularly to an indoor unit for an air conditioner. Background Technology

[0002] The field of home appliance technology encompasses a wide range of product categories, including but not limited to refrigerators, washing machines, air conditioners, microwave ovens, dishwashers, and vacuum cleaners. The technological development trends for these products primarily focus on intelligentization, energy conservation and environmental protection, optimized user experience, and the application of new materials. Optimized user experience is achieved through design innovation and functional enhancement to meet consumers' demands for health, convenience, and personalization.

[0003] As an important part of home appliances, the indoor unit of an air conditioner can draw in fresh outdoor air through the fresh air impeller and exhaust stale indoor air to the outside through the exhaust impeller, thus completing the replacement of fresh air with fresh air. Moreover, through the heat exchange core, it can exchange heat between the fresh air entering the room and the indoor air about to be exhausted, so that the temperature of the fresh air entering the room is closer to the indoor temperature. There is no need to start the compressor to heat or cool the fresh air, and it can also avoid the fresh air from significantly affecting the indoor temperature.

[0004] During the operation of the indoor unit of the air conditioner, the fresh air fan and the exhaust fan will rotate at the same time, and both fans will generate noise, resulting in a relatively loud noise when the entire fresh air module is working, which affects the user's experience. Utility Model Content

[0005] This application discloses an indoor air conditioning unit that can reduce the noise of the fresh air module without changing the dimensions of the various structures of the fresh air module. The sound-absorbing components and sound-absorbing holes occupy less additional space, thus saving space.

[0006] To achieve the above objectives, this application discloses an indoor air conditioning unit, comprising: a casing; a fresh air module disposed within the casing, the fresh air module comprising: a fresh air volute; a fresh air impeller disposed within the fresh air volute, the fresh air impeller being used to draw in fresh outdoor air; an exhaust volute disposed parallel to the fresh air volute along its axial direction; and an exhaust impeller disposed within the exhaust volute, wherein the rotation axis of the exhaust impeller and the rotation axis of the fresh air impeller are both along... The axial extension of the fresh air volute and the exhaust impeller are used to exhaust stale air from the room; a drive motor is connected to both the fresh air impeller and the exhaust impeller to drive them to rotate; a heat exchange core housing is disposed at the air outlet of the fresh air volute, and the heat exchange core housing has: a heat exchange chamber, which is connected to both the air outlet of the fresh air volute and the air outlet of the exhaust volute; and a heat exchange core is disposed within the heat exchange chamber to exchange air with the fresh air volute. Indoor stale air and outdoor fresh air flowing through the heat exchange chamber exchange heat. The heat exchange core has: a fresh air flow channel configured to allow the fresh air to pass through, enabling heat exchange between the fresh air and the stale air; the fresh air flow channel has a fresh air heat exchange outlet for discharging the heat-exchanged fresh air; the heat exchange core housing includes: a fresh air outlet guide connected to the heat exchange core housing, one end of which communicates with the heat exchange chamber, and the other end of which has a fresh air outlet for communicating with the indoor space; multiple sound-absorbing holes on the side wall of the fresh air outlet guide, at least some of which face the fresh air heat exchange outlet; a sound-absorbing box disposed on the outer wall of the fresh air outlet guide, with a sound-absorbing cavity formed inside the sound-absorbing box, which communicates with the sound-absorbing holes; and a sound-absorbing element disposed within the sound-absorbing cavity for absorbing noise.

[0007] Thus, when fresh air flows out after heat exchange through the heat exchange core, the noise it carries can act on the sound-absorbing holes. At this time, the sound-absorbing holes and the sound-absorbing cavity inside the sound-absorbing box form a Helmholtz resonator. According to the Helmholtz resonance principle, when the noise frequency matches the natural frequency of the resonator, resonance will occur and the sound energy will be consumed, thereby weakening the noise energy. The sound-absorbing components inside the sound-absorbing cavity have a porous structure, which can further absorb the residual noise entering the sound-absorbing cavity through the sound-absorbing holes, forming a dual noise reduction effect of resonance silencing and material sound absorption, specifically solving the noise superposition problem caused by the simultaneous operation of two fans in a two-way fresh air system. In addition, the sound-absorbing holes, sound-absorbing box, and sound-absorbing components are all set on the outer wall and outside of the fresh air outlet guide, without the need to adjust the dimensions of the original core structure of the fresh air module (such as the fresh air volute, exhaust volute, drive motor, etc.). While achieving noise reduction, it does not change the internal layout and space occupation of the original module. The additional noise reduction structure is small in size, avoiding the problem of increased overall device size or crowded internal space due to noise reduction design, thus balancing noise reduction effect and space efficiency.

[0008] As an optional implementation, the fresh air outlet guide includes: a mounting wall, which is disposed opposite to the heat exchange core, the sound-absorbing hole passing through the mounting wall, and the sound-absorbing box disposed on the outer surface of the mounting wall.

[0009] In this way, the sound-absorbing holes can directly face the path of the fresh air flowing out of the heat exchange core. When the fresh air is discharged through the fresh air heat exchange outlet of the heat exchange core, the noise it carries will first act on the mounting wall with the sound-absorbing holes. The sound-absorbing holes can guide the noise to the sound-absorbing cavity, and together with the sound-absorbing components, achieve efficient noise reduction, reducing the attenuation or diffusion of noise in the propagation path, allowing the sound absorption effect to act more directly on the noise source and improving noise reduction efficiency. In addition, the sound-absorbing holes are only set on the side wall opposite to the fresh air heat exchange outlet, and the sound-absorbing box is correspondingly external, occupying little space. This ensures that the sound-absorbing components have sufficient volume to play their role while not affecting the fresh air output efficiency, achieving a balance between noise reduction and ventilation in a limited space.

[0010] As an optional implementation, the angle between the axis of the sound-absorbing hole and the extension direction of the fresh air flow channel is less than or equal to 30°.

[0011] Thus, when the angle between the axis of the sound-absorbing hole and the direction of the fresh air flow is less than or equal to 30°, the sound-absorbing hole can be more "directly" aligned with the main propagation path of noise. This allows noise waves to enter the sound-absorbing hole at a more direct angle, reducing sound wave reflection loss caused by angular deviation. This enables sound wave energy to more efficiently excite the resonance system formed by the sound-absorbing hole and the sound-absorbing cavity, enhancing the resonance noise reduction effect. If the angle between the axis of the sound-absorbing hole and the direction of the fresh air flow is too large (e.g., nearly perpendicular), the airflow will create local airflow disturbance at the opening of the sound-absorbing hole, increasing the resistance to fresh air flow and even generating additional turbulent noise. A small angle design minimizes the obstruction of the sound-absorbing hole to the main direction of the fresh air flow, ensuring smooth airflow as it passes through the installation wall.

[0012] As an optional implementation, the axis of the sound-absorbing hole is parallel to the extension direction of the fresh air flow channel.

[0013] In this way, fresh air flows out along the fresh air duct, and the direction of noise propagation in the fresh air corresponds to the sound absorption hole. The noise sound wave can enter the sound absorption hole directly. At this time, the reflection loss of the sound wave at the hole opening is minimized, and most of the sound energy can directly enter the sound absorption cavity. This avoids some noise from bypassing the sound absorption hole and directly propagating into the room due to angular deviation, resulting in a better sound insulation effect.

[0014] As an optional implementation, the mounting wall has an angle with the fresh air outlet surface of the heat exchange core to guide the heat-exchanged fresh air into the room.

[0015] The angle α between the mounting wall and the fresh air outlet surface guides the flow of the heat-exchanged fresh air. The mounting wall changes the direction of the fresh air flow, directing it into the room and preventing it from being blocked by the wall after exiting the heat exchange outlet, which could affect the airflow volume. Thus, while ensuring sufficient fresh air volume, the noise reduction effect of the sound-absorbing holes on the mounting wall is effectively achieved.

[0016] As an optional implementation, the air outlet direction of the fresh air outlet is the same as the air guiding direction of the mounting wall.

[0017] In this way, after being guided by the mounting wall, the fresh air can flow out from the fresh air outlet along the direction of the mounting wall, shortening the flow path of the fresh air inside the fresh air module and ensuring that the fresh air flows smoothly into the room.

[0018] As an optional implementation, the sound-absorbing box is detachably connected to the mounting wall.

[0019] Thus, during long-term operation, the sound-absorbing components of the fresh air module may experience a decline in sound absorption performance due to the adsorption of dust, moisture, or aging. The detachable sound-absorbing box allows users or maintenance personnel to quickly remove the sound-absorbing box without disassembling the core structure of the indoor air conditioning unit, and to clean, dry, or replace the internal sound-absorbing components. This reduces the maintenance threshold and cost, while also facilitating the maintenance of the noise reduction effect of the sound-absorbing components and ensuring the long-term stable operation of the fresh air module.

[0020] As an optional implementation, the thickness of the sound-absorbing element is 3mm to 50mm along the thickness direction of the mounting wall.

[0021] Thus, the noise reduction principle of sound-absorbing components relies on the frictional dissipation of sound waves through the internal pores of the material. If the thickness of the sound-absorbing component is less than 3mm, the path for sound waves to penetrate the material will be too short, failing to fully interact with the pore structure, making it difficult to effectively absorb noise. Air conditioning indoor units (especially wall-mounted units) have extremely high requirements for internal space compactness, needing to accommodate core components such as the heat exchange core, volute, and motor. If the thickness is greater than 50mm, it will increase the overall volume of the fresh air module, increase the overall thickness of the unit, or reduce the size of other functional components. Therefore, within this range, a reasonable thickness ensures that the sound-absorbing component has sufficient pore depth to effectively reduce noise (such as airflow turbulence noise and component vibration noise), fully attenuating noise through mechanisms such as frictional dissipation and resonance absorption, ensuring a quiet indoor environment, and without excessively occupying internal space.

[0022] As an optional implementation, the diameter of the sound-absorbing hole is 1mm to 8mm.

[0023] Therefore, if the aperture is too small, the internal pore channels of the material will be narrow, resulting in poor absorption and difficulty in entering the narrow pores. This may even cause reflection on the material surface, leading to noise superposition. If the aperture is too large, the number of friction and reflections between the sound waves and the pore walls inside the material will be too few, reducing energy dissipation efficiency, and the structural strength of the mounting wall will be weak. Within this range, a reasonable aperture can match the main noise frequency of the fresh air module, allowing sound waves to fully enter the pores and efficiently dissipate energy through mechanisms such as friction, reflection, and resonance. This avoids insufficient low-frequency absorption due to an aperture that is too small, or insufficient energy dissipation due to an aperture that is too large, thus achieving effective noise attenuation.

[0024] As an optional implementation, the sound-absorbing element is made of sponge.

[0025] Thus, as a porous elastic material, sponge's internal microporous structure effectively absorbs sound waves of different frequencies. When sound waves enter the pores, they undergo multiple reflections and frictions between the pore walls, converting sound energy into heat energy for dissipation. Moreover, sponge is less expensive and has a simpler processing technology, making it suitable for large-scale mass production. In addition, sponge is lightweight, reducing transportation and assembly costs and improving production efficiency.

[0026] Compared with the prior art, the beneficial effects of this application are:

[0027] The air conditioning indoor unit provided in this application embodiment has at least some sound-absorbing holes facing the heat exchange core. When fresh air flows out after heat exchange through the heat exchange core, the noise it carries can act on the sound-absorbing holes. At this time, the sound-absorbing holes and the sound-absorbing cavity inside the sound-absorbing box form a Helmholtz resonator. According to the Helmholtz resonance principle, when the noise frequency matches the natural frequency of the resonator, resonance will occur and sound energy will be consumed, thereby weakening the noise energy. The sound-absorbing component inside the sound-absorbing cavity has a porous structure, which can further absorb the residual noise entering the sound-absorbing cavity through the sound-absorbing holes, forming a dual noise reduction effect of resonance silencing and material sound absorption, specifically solving the noise superposition problem caused by the simultaneous operation of two fans in a bidirectional fresh air system. In addition, the sound-absorbing holes, sound-absorbing box, and sound-absorbing components are all set on the outer wall and outside of the fresh air outlet guide, without the need to adjust the size of the original core structure of the fresh air module (such as the fresh air volute, exhaust volute, drive motor, etc.). While achieving noise reduction, it does not change the internal layout and space occupation of the original module. The additional noise reduction structure is small in size, avoiding the problem of increased overall device size or crowded internal space due to noise reduction design, thus balancing noise reduction effect and space efficiency. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments 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 these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of an air conditioner indoor unit disclosed in an embodiment of this application;

[0030] Figure 2 This is a schematic diagram of the air conditioner indoor unit disclosed in this application, omitting the front panel;

[0031] Figure 3 This is a first-view structural diagram of the fresh air module disclosed in the embodiments of this application;

[0032] Figure 4 This is a schematic diagram of the fresh air module disclosed in the embodiments of this application from a second-view perspective;

[0033] Figure 5 This is a schematic diagram of the fresh air module disclosed in the embodiments of this application from a third-person perspective;

[0034] Figure 6 for Figure 4 Sectional view at point AA;

[0035] Figure 7 for Figure 6 A magnified view of a section at point B in the middle;

[0036] Figure 8 This is an exploded view of the fresh air module disclosed in an embodiment of this application;

[0037] Figure 9 This is an exploded view of the sound-absorbing component, sound-absorbing box, and fresh air outlet guide disclosed in the embodiments of this application;

[0038] Figure 10 This is a schematic diagram of the installation wall and fresh air outlet surface disclosed in the embodiments of this application.

[0039] Explanation of reference numerals in the attached figures:

[0040] 100-Indoor unit of air conditioner; 1-Casing; 1a-First receiving cavity; 1b-Second receiving cavity; 11 Front panel; 12-Baffle; 2-Fresh air module; 211-Fresh air volute; 211a-Air outlet of fresh air volute; 212-Fresh air impeller; 213-Filter module; 221-Exhaust air volute; 221a-Air outlet of exhaust air volute; 222-Exhaust air impeller; 23-Drive motor; 241-Heat exchange core housing; 241a-Heat exchange chamber; 242-Heat exchange core; 24 21-Fresh airflow duct; 2421a-Fresh air heat exchange outlet; 2422-Fresh air outlet surface; 25-Fresh air outlet guide; 25a-Fresh air outlet; 251-Mounting wall; 251a-Sound absorption hole; 26-Sound absorption box; 26a-Sound absorption cavity; 27-Sound absorption component; M-Axis of sound absorption hole; N-Extension direction of fresh airflow duct; a-Angle between mounting wall and fresh air outlet surface; d1-Thickness of sound absorption component; d2-Diameter of sound absorption hole; X-Outlet direction of fresh air outlet. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0043] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0044] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0045] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0046] As an important part of home appliances, the indoor unit of an air conditioner can draw in fresh outdoor air through the fresh air impeller and exhaust stale indoor air to the outside through the exhaust impeller, thus completing the replacement of fresh air with fresh air. Moreover, through the heat exchange core, it can exchange heat between the fresh air entering the room and the indoor air about to be exhausted, so that the temperature of the fresh air entering the room is closer to the indoor temperature. There is no need to start the compressor to heat or cool the fresh air, and it can also avoid the fresh air from significantly affecting the indoor temperature.

[0047] During the operation of the indoor unit of the air conditioner, the fresh air fan and the exhaust fan will rotate at the same time, and both fans will generate noise, resulting in a relatively loud noise when the entire fresh air module is working, which affects the user's experience.

[0048] Based on this, this application discloses an indoor air conditioning unit, which provides sound-absorbing holes on the fresh air outlet guide section and provides a sound-absorbing box and sound-absorbing components on the outer wall of the fresh air outlet guide section. At least some of the sound-absorbing holes are opposite to the fresh air heat exchange outlet, and the sound-absorbing cavity is connected to the sound-absorbing holes. This can reduce the noise of the fresh air module without changing the size of each structure of the fresh air module. The additional space occupied by the sound-absorbing components and sound-absorbing holes is small, saving space.

[0049] The technical solution of this application will be further described below with reference to the embodiments and accompanying drawings.

[0050] Please see Figures 1 to 3 as well as Figure 9 , Figure 1 This is a schematic diagram of the structure of the air conditioner indoor unit 100 disclosed in the embodiments of this application. Figure 2 This is a schematic diagram of the air conditioner indoor unit 100 disclosed in this application, omitting the front panel 11. Figure 3 This is a first-view structural diagram of the fresh air module 2 disclosed in an embodiment of this application. Figure 9This is an exploded view of the sound-absorbing component 27, sound-absorbing box 26, and fresh air outlet guide 25 disclosed in this application embodiment. This application embodiment discloses an air conditioner indoor unit 100. This embodiment takes a wall-mounted air conditioner as an example. The air conditioner indoor unit 100 is an important component of the wall-mounted air conditioner. The air conditioner indoor unit 100 performs an air conditioning cycle by using an air supply system and a related heat exchange system. This cycle encompasses a series of processes, including air intake, heat exchange, airflow propulsion, and temperature regulation, thereby providing a suitable temperature and air quality for the indoor space. A strong airflow is generated by the air supply system to draw indoor air into the ducted air conditioner. The intake air then flows through the heat exchange system to absorb heat from the air, achieving a cooling effect, and transfers the heat to the refrigerant through the heat exchange process. The cooled air, after heat exchange, is pushed back into the indoor space by the air supply system, forming a cycle. Through this cycle process, the temperature of the indoor space is regulated, and the indoor air quality is improved through airflow circulation, providing users with a comfortable and healthy indoor environment. In this embodiment, the indoor unit is mounted on the indoor wall.

[0051] The indoor unit 100 of the air conditioner includes a casing 1 and a fresh air module 2. The casing 1 has a receiving cavity. The fresh air module 2 is installed inside the casing 1. The fresh air module 2 draws in fresh outdoor air and discharges it into the room, and discharges the stale indoor air to the outside, thereby changing the indoor air quality by exchanging the indoor air with fresh air.

[0052] In some embodiments, the housing 1 is provided with a partition 12, which divides the accommodating cavity into a first accommodating cavity 1a and a second accommodating cavity 1b. The first accommodating cavity 1a is connected to the second accommodating cavity 1b. The first accommodating cavity 1a is used to house components such as the compressor, evaporator, and condenser. When cooling, the indoor evaporator absorbs heat and blows cold air into the room. When heating, the condenser releases heat to provide warmth through a four-way valve to maintain the set indoor temperature, which is the core function of the air conditioner. The second accommodating cavity 1b is used to house the fresh air module 2. The indoor air inlet side of the fresh air module 2 that draws in indoor polluted air faces the first accommodating cavity 1a, which facilitates the intake of indoor polluted air through the first accommodating cavity 1a. Under the premise of realizing functional zoning, the indoor ventilation function is realized.

[0053] In some embodiments, the fresh air module 2 includes a fresh air volute 211 and a fresh air impeller 212. The fresh air volute 211 is a shell covering the outside of the fresh air impeller 212, forming a smooth air duct inside. The fresh air impeller 212 is placed inside the fresh air volute 211 and is used to draw in fresh outdoor air. The blades are distributed circumferentially along the axis of rotation and can rotate with the axis. When the fresh air impeller 212 rotates, it generates negative pressure, drawing in fresh outdoor air (fresh air) through a duct connected to the outside. The curved structure of the fresh air volute 211 guides the airflow from the edge of the impeller, leading the fresh air into the heat exchange assembly through the air outlet of the fresh air volute 211.

[0054] In some embodiments, combined with Figure 5 , Figure 5 This is a structural schematic diagram of the fresh air module 2 disclosed in this application from a third-person perspective. The fresh air module 2 also includes a filter module 213, which is disposed between the outdoor air inlet and the fresh air volute 211. The filter module 213 includes a filter element and a filter end cap. The filter element is disposed on the air inlet side of the fresh air volute 211, and the filter end cap is disposed on the side of the filter element away from the fresh air volute 211. A filter cavity is formed between the filter end cap and the fresh air volute 211. Since the outdoor fresh air may contain dust and other impurities, when the fresh air impeller 212 rotates, the outdoor fresh air enters the filter cavity from the outdoor air inlet, is filtered by the filter element, enters the fresh air volute 211, and exchanges heat with the indoor stale air through the heat exchange component before entering the room from the fresh air outlet.

[0055] In some embodiments, the fresh air module 2 includes an exhaust volute 221 and an exhaust impeller 222, arranged side-by-side with the fresh air volute 211 along the axial direction (i.e., the impeller shaft direction), forming a double-volute parallel structure to save internal space. The exhaust impeller 222 is used to exhaust stale air from the room. The air inlet cover of the exhaust volute 221 is provided with an indoor air inlet, serving as the inlet for stale air. The exhaust volute 221 and the fresh air volute 211 are independently separated to prevent fresh air and stale air from mixing before entering the heat exchange assembly. When the exhaust impeller 222 rotates, it generates negative pressure, drawing in indoor air (stale air) through the indoor air inlet. The curved structure of the exhaust volute 221 guides the airflow from the impeller edge, directing the stale air through the exhaust volute 221 outlet to the heat exchange assembly before it is discharged from the exhaust duct.

[0056] In the fresh air module 2 of the indoor air conditioner unit 100, the distinction between fresh air and stale air is based on the direction of airflow, rather than an absolute sense of "clean" and "polluted." Fresh air refers to air introduced from outdoors into the room. Its function is to replenish the indoor air and reduce the concentration of carbon dioxide or odors in the existing indoor air. The "freshness" of fresh air only indicates that its source is outdoors, but it may contain impurities from outdoors and needs to be treated by purification components such as filters before being sent indoors. Even if it is not treated, its essence is still called fresh air. Stale air refers to air exhausted from indoors to outdoors. Its function is to remove pollutants accumulated indoors (such as carbon dioxide, water vapor, and odors exhaled by humans) to prevent a decline in indoor air quality. The "staleness" of stale air only indicates that its source is indoors. Even if the indoor air itself is relatively clean (such as freshly purified air), as long as it can be exhausted from indoors to outdoors, it is called stale air. For example, when the indoor air pressure is too high, the system may exhaust some clean air to balance the air pressure; this part of the air is still considered stale air.

[0057] In some embodiments, combined with Figure 8 , Figure 8 The exploded view of the fresh air module 2 disclosed in the embodiment of this application shows that the fresh air module 2 also includes a drive motor 23, which is connected to the fresh air impeller 212 and the exhaust impeller 222 respectively, so as to drive the fresh air impeller 212 and the exhaust impeller 222 to rotate.

[0058] In some embodiments, combined with Figure 3 and Figure 4 , Figure 4This is a schematic diagram of the fresh air module 2 disclosed in this application from a second perspective. The fresh air module 2 also includes a heat exchange core shell 241 and a heat exchange core 242. The heat exchange core shell 241 is disposed at the air outlet of the fresh air volute 211 and has a heat exchange cavity 241a. The heat exchange cavity 241a is connected to the air outlet of the fresh air volute 211 and the air outlet of the exhaust volute 221, respectively. The heat exchange core 242 is disposed in the heat exchange cavity 241a to exchange heat between the indoor stale air and the outdoor fresh air flowing through the heat exchange cavity 241a. The heat exchange core housing 241 also has a fresh air heat exchange inlet, a fresh air heat exchange outlet 2421a, an exhaust heat exchange inlet, and an exhaust heat exchange outlet. The fresh air heat exchange inlet is connected to the outlet of the fresh air volute 211, and the fresh air heat exchange outlet 2421a is used to connect to the indoor space. The exhaust heat exchange inlet is connected to the outlet of the exhaust volute 221, and the exhaust heat exchange outlet is used to connect to the outdoor space. A fresh air flow channel 2421 and a stale air flow channel are formed inside the heat exchange core 242. The fresh air flow channel 2421 is connected to the fresh air heat exchange inlet and the fresh air heat exchange outlet 2421a, respectively. The stale air flow channel is connected to the exhaust heat exchange inlet and the exhaust heat exchange outlet, respectively. The fresh air (outdoor air) and the stale air (indoor air) exchange heat without direct contact. For example, in summer, the temperature of indoor stale air is lower than that of outdoor fresh air, and the coldness of the stale air is transferred to the fresh air, thus lowering the temperature of the fresh air. In winter, the temperature of indoor stale air is higher than that of outdoor fresh air, and the heat of the stale air is transferred to the fresh air, thus raising the temperature of the fresh air, improving the energy efficiency of the air conditioning, and preventing the introduced fresh air from directly affecting the indoor temperature.

[0059] In some embodiments, the heat exchange core housing 241 includes a fresh air outlet guide 25 connected to the heat exchange core housing 241. One end of the fresh air outlet guide 25 is connected to the heat exchange chamber 241a, and the other end is provided with a fresh air outlet 25a, which is used to connect to the indoor space.

[0060] In some embodiments, combined with Figure 6 , Figure 7 and Figure 9 , Figure 6 for Figure 4 Sectional view at point AA. Figure 7 for Figure 6 The enlarged view at point B shows that the side wall of the fresh air outlet guide section 25 is provided with multiple sound-absorbing holes 251a, at least some of which face the fresh air heat exchange outlet 2421a. The fresh air module 2 also includes a sound-absorbing box 26, which is located on the outer wall of the fresh air outlet guide section 25. A sound-absorbing cavity 26a is formed inside the sound-absorbing box 26, and the sound-absorbing cavity 26a is connected to the sound-absorbing holes 251a.

[0061] When fresh air flows out after being heated by the heat exchange core 242, the noise it carries can act on the sound absorption holes 251a. At this time, the sound absorption holes 251a and the sound absorption cavity 26a inside the sound absorption box 26 form a Helmholtz resonator. According to the Helmholtz resonance principle, when the noise frequency matches the natural frequency of the resonator, resonance will be triggered and sound energy will be consumed, thereby weakening the noise energy.

[0062] In some embodiments, the fresh air module 2 further includes a sound-absorbing component 27 disposed within the sound-absorbing cavity 26a, which is used to absorb noise. The sound-absorbing component 27 within the sound-absorbing cavity 26a has a porous structure, which can further absorb residual noise entering the sound-absorbing cavity 26a through the sound-absorbing holes 251a, forming a dual noise reduction effect of resonance silencing and material sound absorption, specifically solving the noise superposition problem caused by the simultaneous operation of two fans in a bidirectional fresh air system.

[0063] Furthermore, the sound-absorbing holes 251a, sound-absorbing boxes 26, and sound-absorbing components 27 are all located on the outer wall and exterior of the fresh air outlet guide section 25, eliminating the need to adjust the dimensions of the original core structure of the fresh air module 2 (such as the fresh air volute 211, the exhaust volute 221, the drive motor 23, etc.). While achieving noise reduction, the internal layout and space occupation of the original module remain unchanged. The additional noise-reducing structure is small in size, avoiding the problem of increased overall equipment size or cramped internal space due to noise reduction design, thus balancing noise reduction effect and space efficiency.

[0064] It should be noted that the sound-absorbing component 27 can be made of various sound-absorbing materials. In the first possible implementation, the sound-absorbing component 27 is made of open-cell polyurethane foam with a large number of interconnected micropores inside. After sound waves enter, they will undergo multiple reflections and frictions in the pores, converting sound energy into heat energy. The sound absorption effect is significant, the chemical stability is good, it is not easily affected by changes in temperature and humidity inside the air conditioner, and the service life is long. In the second possible implementation, the sound-absorbing component 27 can also be made of centrifugal glass wool, which is formed by interwoven glass fibers to form a three-dimensional porous structure. It has excellent absorption effect on mid-to-high frequency noise, good heat insulation, can adapt to possible temperature fluctuations inside the air conditioner, low moisture absorption, is not easy to get damp and moldy, and is suitable for long-term use in a closed environment. This embodiment does not limit this.

[0065] Optionally, the cavity inside the sound-absorbing box 26 matches the shape of the sound-absorbing component 27, so that the sound-absorbing component 27 can be stably installed between the sound-absorbing box 26 and the fresh air outlet guide 25, and covers the sound-absorbing hole 251a, thus achieving a good noise reduction effect.

[0066] It should also be noted that the space inside the sound-absorbing cavity 26a is limited and is filled with sound-absorbing components 27, so it has little impact on the fresh air output volume and can achieve a good noise reduction effect while ensuring the fresh air volume.

[0067] The sound-absorbing holes 251a may be provided on any possible side wall of the fresh air outlet guide section 25, as long as at least a portion of the sound-absorbing holes 251a face the heat exchange core 242. In a first possible implementation, each side wall of the fresh air outlet guide section 25 is provided with sound-absorbing holes 251a. In a second possible implementation, the fresh air outlet guide section 25 is provided with sound-absorbing holes 251a on the side wall opposite to the heat exchange core 242 along the fresh air flow channel. The direction of the axial extension of the sound-absorbing holes 251a can be adjusted so that at least a portion of the sound-absorbing holes 251a face the fresh air heat exchange outlet 2421a. This embodiment does not limit this.

[0068] In some embodiments, combined with Figure 6 , Figure 7 and Figure 9 The fresh air outlet guide section 25 includes a mounting wall 251. The mounting wall 251 and the heat exchange core 242 are arranged opposite to each other along the extension direction of the fresh air flow channel 2421. The sound absorption holes 251a are inserted through the mounting wall 251, that is, all the sound absorption holes 251a are opposite to the heat exchange core 242. The sound absorption box 26 is disposed on the outer surface of the mounting wall 251 and covers the sound absorption holes 251a.

[0069] In this way, the sound-absorbing hole 251a can directly face the path of fresh air flowing out of the heat exchange core 242. When the fresh air is discharged through the fresh air heat exchange outlet 2421a of the heat exchange core 242, the noise it carries will first act on the mounting wall 251 with the sound-absorbing hole 251a. The sound-absorbing hole 251a can guide the noise to the sound-absorbing cavity 26a, and work with the sound-absorbing component 27 to achieve efficient noise reduction, reducing the attenuation or diffusion of noise in the propagation path, allowing the sound absorption effect to act more directly on the noise source and improving the noise reduction efficiency. In addition, the sound-absorbing hole 251a is only set on the side wall opposite to the fresh air heat exchange outlet 2421a, and the sound-absorbing box 26 is correspondingly external, occupying little space. This ensures that the sound-absorbing component 27 has sufficient volume to play its role, without affecting the fresh air outlet efficiency, and achieves a balance between noise reduction and ventilation in a limited space.

[0070] In some embodiments, combined with Figure 10 , Figure 10 The diagram below shows the structure of the mounting wall 251 and the fresh air outlet surface 2422 disclosed in the embodiments of this application. The angle between the axis M of the sound absorption hole 251a and the extension direction N of the fresh air flow channel 2421 (i.e., the direction from the fresh air heat exchange inlet of the heat exchange core 242 to the fresh air heat exchange outlet 2421a) is less than or equal to 30°.

[0071] When the angle between the axis M of the sound-absorbing hole 251a and the extension direction N of the fresh air flow channel 2421 is less than or equal to 30°, the sound-absorbing hole 251a can be more "directly" aligned with the main propagation path of noise, allowing noise sound waves to enter the sound-absorbing hole 251a at a more direct angle, reducing sound wave reflection loss caused by angle deviation, and enabling sound wave energy to more efficiently excite the resonance system formed by the sound-absorbing hole 251a and the sound-absorbing cavity 26a, enhancing the resonance noise reduction effect, and the sound-absorbing component 27 can absorb noise more effectively.

[0072] If the angle between the axis M of the sound-absorbing hole 251a and the direction of fresh air flow is too large (such as being nearly perpendicular), the airflow will create local airflow disturbance at the opening of the sound-absorbing hole 251a, increasing the resistance to fresh air flow and even generating additional turbulent noise. A small angle design can make the sound-absorbing hole 251a less obstructive to the mainstream direction of fresh air, ensuring that the fresh air flows smoothly when passing through the mounting wall 251.

[0073] The angle between the axis M of the sound-absorbing hole 251a and the extension direction N of the fresh air flow channel 2421 can be 0°–10°, 8°–18°, 10°–22°, 22°–30°, etc., with 0°, 18°, or 30° being exemplary. Taking an angle of 18° between the axis M of the sound-absorbing hole 251a and the extension direction N of the fresh air flow channel 2421 as an example, noise waves can enter the sound-absorbing hole 251a more smoothly, effectively reducing noise.

[0074] In some embodiments, combined with Figure 10 The axis M of the sound-absorbing hole 251a is parallel to the extension direction N of the fresh air flow channel 2421 (that is, the direction from the fresh air heat exchange inlet of the heat exchange core 242 to the fresh air heat exchange outlet 2421a).

[0075] In this way, fresh air flows out along the fresh air duct 2421. The direction of noise propagation in the fresh air corresponds to the sound absorption hole 251a. The noise sound waves can enter the sound absorption hole 251a directly. At this time, the reflection loss of the sound waves at the hole opening is minimized. Most of the sound energy can directly enter the sound absorption cavity 26a, avoiding the possibility that some noise may bypass the sound absorption hole 251a and directly propagate into the room due to the angle deviation. The sound absorption effect is good.

[0076] In some embodiments, the fresh air outlet surfaces 2422 of the mounting wall 251 and the heat exchange core 242 may be arranged in parallel, or the fresh air outlet surfaces 2422 of the mounting wall 251 and the heat exchange core 242 may have an angle opposite to the side facing the fresh air outlet.

[0077] In some embodiments, combined with Figure 10 The fresh air outlet surface 2422 of the mounting wall 251 and the heat exchange core 242 has an angle α facing the fresh air outlet 25a to guide the heat-exchanged fresh air to flow into the room.

[0078] The angle α between the mounting wall 251 and the fresh air outlet surface 2422 guides the flow of the heat-exchanged fresh air. The mounting wall 251 changes the direction of the fresh air outlet, directing it into the room and preventing it from being blocked by the mounting wall 251 after the fresh air heat exchange outlet, which could affect the fresh air output. Thus, while ensuring the fresh air output, the noise reduction effect of the sound-absorbing holes 251a on the mounting wall 251 is effectively achieved.

[0079] The angle α between the mounting wall 251 and the fresh air outlet surface 2422 of the heat exchange core 242 and the fresh air outlet 25a can be 0° < α < 30°, 20° < α < 50°, 50° ≤ α < 90°, etc., and can be 10°, 30°, 45° or 70°, etc. Taking an angle α of 30° between the mounting wall 251 and the fresh air outlet surface 2422 and the fresh air outlet 2422 and the fresh air outlet 25a as an example, the fresh air after heat exchange can flow from the fresh air heat exchange outlet 2421a to the fresh air outlet 25a along the inclined mounting wall, which can reduce the amount of fresh air loss at the mounting wall.

[0080] It should be noted that the mounting wall 251 is opposite to the fresh air outlet surface 2422, so the angle α between the mounting wall 251 and the fresh air outlet surface 2422 of the heat exchange core 242 facing the fresh air outlet 25a will not be an obtuse angle.

[0081] It is understood that the fresh air outlet 25a may face different directions. For example, the air outlet direction of the fresh air outlet 25a may be at an angle to or parallel to the air guide direction of the mounting wall 251. This embodiment does not limit this.

[0082] In some embodiments, the air outlet direction of the fresh air outlet 25a is the same as the air guiding direction of the mounting wall 251. After being guided by the mounting wall 251, the fresh air can flow out from the fresh air outlet 25a along the air guiding direction of the mounting wall 251, shortening the flow path of the fresh air inside the fresh air module 2 and ensuring that the fresh air flows smoothly into the room.

[0083] In some embodiments, the sound-absorbing box 26 is detachably connected to the mounting wall 251.

[0084] During long-term operation, the sound-absorbing component 27 of the fresh air module 2 may experience a decline in sound absorption performance due to the adsorption of dust, moisture, or aging. The detachable sound-absorbing box 26 allows users or maintenance personnel to quickly remove the sound-absorbing box 26 without disassembling the core structure of the indoor air conditioning unit 100, and to clean, dry, or replace the internal sound-absorbing component 27. This reduces the maintenance threshold and cost, while also facilitating the noise reduction effect of the sound-absorbing components and ensuring the long-term stable operation of the fresh air module 2.

[0085] It should be noted that there are several possible detachable connection structures between the sound-absorbing box 26 and the mounting wall 251. In the first possible implementation, an elastic buckle can be provided on the edge of the sound-absorbing box 26, and a corresponding slot is opened on the mounting wall 251. The buckle and the slot are elastically engaged to achieve fixation. When disassembling, pressing the buckle releases the connection. In the second possible implementation, threaded holes are opened on the sound-absorbing box 26 and the corresponding mounting wall 251, and screws are passed through the threaded holes for fixation. The structure is simple, and this embodiment does not limit it.

[0086] In some embodiments, combined with Figure 7 Along the thickness direction of the mounting wall 251, the thickness d1 of the sound-absorbing component 27 is 3mm to 50mm.

[0087] The noise reduction principle of the sound-absorbing component 27 relies on the frictional dissipation of sound waves through the internal pores of the material. If the thickness of the sound-absorbing component 27 is less than 3mm, the path for sound waves to penetrate the material will be too short, failing to fully interact with the pore structure, making it difficult to effectively absorb noise. The indoor unit 100 of the air conditioner (especially the wall-mounted type) has extremely high requirements for internal space compactness, needing to accommodate core components such as the heat exchange core 242, volute, and motor. If the thickness is greater than 50mm, it will increase the overall volume of the fresh air module 2, increase the overall thickness of the unit, or reduce the size of other functional components. Therefore, within this range, a reasonable thickness ensures that the sound-absorbing component 27 has sufficient pore depth to effectively reduce noise (such as airflow turbulence noise and component vibration noise), fully attenuating noise through mechanisms such as frictional dissipation and resonance absorption, ensuring a quiet indoor environment, and without excessively occupying internal space.

[0088] The thickness d1 of the sound-absorbing component 27 can be 3mm-20mm, 15mm-35mm, 35mm-50mm, etc., and can be 3mm, 30mm or 50mm for example. Taking the thickness d1 of the sound-absorbing component 27 as 30mm as an example, the sound-absorbing component 27 has sufficient pore depth, which can effectively reduce noise and will not excessively occupy the internal space of the air conditioner indoor unit.

[0089] In some embodiments, combined with Figure 7 The diameter d2 of the sound-absorbing hole 251a is 1mm to 8mm.

[0090] If the aperture is too small, the internal pore channels of the material will be narrow, resulting in poor absorption and difficulty in entering the narrow pores. This may even cause reflection on the material surface, leading to noise superposition. If the aperture is too large, the number of friction and reflections between the sound waves and the pore walls inside the material will be too few, reducing energy dissipation efficiency, and the structural strength of the mounting wall 251 will be relatively low. Within this range, a suitable aperture can match the main noise frequency of the fresh air module 2, allowing sound waves to fully enter the pores and efficiently dissipate energy through mechanisms such as friction, reflection, and resonance. This also avoids insufficient low-frequency absorption due to an aperture that is too small, or insufficient energy dissipation due to an aperture that is too large, thus achieving effective noise attenuation.

[0091] The aperture d2 of the sound-absorbing hole 251a can be 1mm-4mm, 3mm-5mm, 5mm-8mm, etc., and can be 1mm, 5mm or 8mm for example. Taking the aperture d2 of the sound-absorbing hole 251a as 5mm as an example, it allows the sound waves to fully enter the pore, while avoiding the problems of poor noise reduction performance and poor structural stability of the mounting wall 251 caused by excessively large aperture.

[0092] In some embodiments, the sound-absorbing element 27 is made of sponge.

[0093] As a porous elastic material, sponge's microporous structure effectively absorbs sound waves of different frequencies. When sound waves enter the pores, they undergo multiple reflections and friction between the pore walls, converting sound energy into heat energy for dissipation. Moreover, sponge is less expensive and has a simpler processing technology, making it suitable for large-scale mass production. In addition, sponge is lightweight, reducing transportation and assembly costs and improving production efficiency.

[0094] Optionally, the sound-absorbing component 27 can be centrifugal glass wool, which has a wide range of sound absorption frequencies and good high temperature resistance and fire resistance; the sound-absorbing component 27 can also be melamine foam, which has a wide range of sound absorption frequencies and has flame retardant, high and low temperature resistance, and corrosion resistance; the sound-absorbing component 27 can also be wool felt, which is made of compressed wool fibers, has a natural porous structure, good air permeability and elasticity, and can adapt to slight structural deformation.

[0095] Optionally, the fresh air outlet guide section 25 and the heat exchange core housing 241 are integrally formed. In a split design, the connection parts may become loose or have gaps due to long-term vibration and temperature changes. However, integral forming ensures that the overall structure of the fresh air outlet guide section 25 and the heat exchange core housing 241 is stable, which can effectively resist the airflow impact and component vibration during the operation of the fresh air module, reduce the additional noise caused by structural loosening, reduce the risk of component deformation and breakage, and extend the service life of the equipment.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An indoor unit for an air conditioner, characterized in that, include: chassis; A fresh air module is disposed within the housing, and the fresh air module includes: Fresh air volute; A fresh air impeller is disposed inside the fresh air volute, and the fresh air impeller is used to draw in fresh air from the outside; An exhaust volute is arranged side-by-side with the fresh air volute along the axial direction of the fresh air volute. An exhaust impeller is disposed inside the exhaust volute, and the shaft of the exhaust impeller and the shaft of the fresh air impeller both extend along the axial direction of the fresh air volute. The exhaust impeller is used to exhaust stale air from the room. A drive motor is connected to the fresh air impeller and the exhaust impeller respectively, so as to drive the fresh air impeller and the exhaust impeller to rotate; A heat exchange core housing is disposed at the air outlet of the fresh air volute, and the heat exchange core housing has: The heat exchange chamber is connected to the air outlet of the fresh air volute and the air outlet of the exhaust volute, respectively. A heat exchange core is disposed within the heat exchange cavity to exchange heat between indoor stale air and outdoor fresh air flowing through the heat exchange cavity. The heat exchange core has the following internal features: The fresh air flow channel is configured to allow fresh air to pass through so that the fresh air can exchange heat with the stale air. The fresh air flow channel has a fresh air heat exchange outlet for discharging the heat-exchanged fresh air. The heat exchange core housing includes: The fresh air outlet guide is provided with one end connected to the heat exchange chamber and the other end provided with a fresh air outlet for connecting to the indoor space. The side wall of the fresh air outlet guide is provided with a plurality of sound-absorbing holes, at least some of which face the fresh air heat exchange outlet. A sound-absorbing box is disposed on the outer wall of the fresh air outlet guide section, and a sound-absorbing cavity is formed inside the sound-absorbing box, which is connected to the sound-absorbing hole; A sound-absorbing component is disposed within the sound-absorbing cavity, and the sound-absorbing component is used to absorb noise.

2. The indoor unit of the air conditioner according to claim 1, characterized in that, The fresh air outlet guide unit includes: The mounting wall is disposed opposite to the heat exchange core, the sound-absorbing hole is disposed through the mounting wall, and the sound-absorbing box is disposed on the outer surface of the mounting wall.

3. The indoor unit of the air conditioner according to claim 2, characterized in that, The angle between the axis of the sound-absorbing hole and the extension direction of the fresh air flow channel is less than or equal to 30°.

4. The indoor unit of the air conditioner according to claim 3, characterized in that, The axis of the sound-absorbing hole is parallel to the extension direction of the fresh air flow channel.

5. The indoor unit of the air conditioner according to claim 3, characterized in that, The mounting wall forms an angle with the fresh air outlet surface of the heat exchange core to guide the heat-exchanged fresh air into the room.

6. The indoor unit of the air conditioner according to claim 5, characterized in that, The air outlet of the fresh air outlet has the same air guide direction as the mounting wall.

7. The indoor unit of the air conditioner according to claim 2, characterized in that, The sound-absorbing box is detachably connected to the mounting wall.

8. The indoor unit of the air conditioner according to claim 6, characterized in that, Along the thickness direction of the mounting wall, the thickness of the sound-absorbing element is 3mm to 50mm.

9. The indoor unit of the air conditioner according to any one of claims 1-7, characterized in that, The diameter of the sound-absorbing hole is 1mm to 8mm.

10. The indoor unit of the air conditioner according to any one of claims 1-7, characterized in that, The sound-absorbing component is made of sponge.

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