An air conditioner

Abstract

The application provides an air conditioner, comprising: an indoor unit, the indoor unit comprising a shell, a fresh air module and a fresh air pipe, the shell comprising a back plate, the back plate being provided with an air inlet; the fresh air module being arranged in the shell, the fresh air module being communicated with the air inlet, the fresh air module being used for introducing outdoor air into the shell through the air inlet and conveying the outdoor air to an indoor space; a first end of the fresh air pipe being fixedly arranged on the back plate and connected to the air inlet, a second end of the fresh air pipe facing the outdoor, the fresh air pipe being used for introducing the outdoor air to the air inlet, so that the outdoor air enters the fresh air module, an inner pipe wall of the fresh air pipe being provided with a spiral flow guide cavity, the flow guide cavity being communicated with an inner cavity of the fresh air pipe, the spiral flow guide cavity guiding the air into a spiral airflow, which not only reduces disorderly collision, reduces additional resistance, improves the flow efficiency of the air in the fresh air pipe, but also uniformly distributes the air, avoids vortex formation and howling sound generation, and realizes low-noise and high-efficiency fresh air conveying.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and more particularly to an air conditioner. Background Technology

[0002] With the continuous iteration and upgrading of air conditioning technology, most air conditioners have gradually evolved from simple temperature regulation devices into indoor environment regulation systems that integrate multiple functions. Some air conditioners are also equipped with fresh air function to introduce fresh outdoor air into the room, thereby improving indoor air quality.

[0003] Driven by the fresh air module, outdoor air is introduced into the indoor unit through the fresh air duct. After being processed by the fresh air module, such as by filtration, it is delivered to the indoor space and then distributed to the air outlets of each room along the inner wall of the duct. In related technologies, fresh air ducts are usually made with a corrugated cross-section to improve duct flexibility. However, this structure has obvious drawbacks. On the one hand, the corrugated inner wall makes the air flow path more complex, causing up-and-down fluctuations, increasing wind resistance, and reducing the fresh air volume. On the other hand, when the wind speed is high, the air is very likely to form vortices on the inner wall of the fresh air duct, which will generate a whistling sound and affect the user experience. Utility Model Content

[0004] This application discloses an air conditioner that enables efficient and low-noise fresh air delivery through a fresh air duct.

[0005] To achieve the above objectives, this application discloses an air conditioner, comprising:

[0006] Indoor unit, the indoor unit includes:

[0007] Housing, the housing comprising:

[0008] The rear panel is provided with an air inlet;

[0009] A fresh air module is disposed inside the housing and is connected to the air inlet. The fresh air module is used to introduce outdoor air into the housing through the air inlet and deliver it to the indoor space.

[0010] The fresh air duct has its first end fixedly mounted on the rear plate and connected to the air inlet. The second end of the fresh air duct faces the outside. The fresh air duct is used to introduce and guide outdoor air to the air inlet so that outdoor air enters the fresh air module. The inner wall of the fresh air duct is provided with a spiral-shaped guide cavity, and the guide cavity is connected to the inner cavity of the fresh air duct.

[0011] In this way, the spiral-shaped airflow guiding cavity can guide the air into a spiral airflow. The spiral airflow decomposes the impact force between the air and the fresh air duct wall into a component force along the tangential direction of the spiral and a component force pointing towards the center of the spiral. This means that when the airflow encounters the duct wall or obstacles, it no longer concentrates on a certain point or area to generate a strong impact, but gradually buffers and adapts along the spiral path, effectively reducing the local impact force. On the one hand, it reduces the disorderly collision between the air and the fresh air duct wall, avoiding additional resistance caused by airflow turbulence, thereby improving the airflow efficiency in the fresh air duct and ensuring that fresh air can enter the fresh air module more smoothly. On the other hand, the spiral airflow makes the air evenly distributed in the fresh air duct, reducing the possibility of vortex formation due to concentrated airflow, thereby avoiding the situation where vortex formation of air on the duct wall at high wind speeds produces a whistling sound, achieving low-noise fresh air delivery.

[0012] This application also provides an air conditioner, wherein the fresh air duct has reinforcing ribs, the reinforcing ribs are spirally protruding along the extension direction of the fresh air duct and are disposed on the outer surface of the fresh air duct, and the guide cavity is formed inside the reinforcing ribs accordingly.

[0013] In this way, by protruding spiral reinforcing ribs on the outer surface of the fresh air duct, the reinforcing ribs can effectively resist external pressure during installation and use, thereby preventing the fresh air duct from deforming and ensuring that the fresh air duct maintains a stable shape and function.

[0014] This application also provides an air conditioner in which the angle between the tangent of the spiral line corresponding to the air guide cavity and the tangent of the cross-sectional circumference of the air duct along the extension direction of the fresh air duct is 5°-30°.

[0015] Thus, by maintaining the angle between the tangent of the spiral of the airflow cavity and the tangent of the cross-sectional circumference of the fresh air duct within 5-30°, the steepness of the spiral is moderate. This provides sufficient rotational power for the airflow, ensuring that the air spirals forward at a reasonable speed within the duct, avoiding low delivery efficiency due to excessively slow rotation. Simultaneously, it effectively controls the friction between the airflow and the duct wall, reducing energy loss and noise generation. Furthermore, the moderate spiral guidance ensures even airflow distribution within the duct, reducing the risk of vortex formation and maintaining a stable airflow pattern. This ensures that fresh air can be smoothly delivered to the fresh air module with high efficiency, low energy consumption, and minimal noise.

[0016] This application also provides an air conditioner, wherein the pitch of the guide cavity is 3-12mm.

[0017] This design allows the pitch of the guide cavity to be between 3-12mm, ensuring a suitable pitch that provides stable spiral guidance for airflow within the duct, forming an orderly spiral airflow. This effectively reduces friction between the air and the duct wall, as well as internal collision losses, guaranteeing efficient fresh air delivery. Simultaneously, it allows for reasonable control of the airflow rotation intensity, avoiding excessive friction due to an excessively small pitch or airflow turbulence caused by an excessively large pitch. Furthermore, this pitch range offers good maneuverability in manufacturing, reducing processing difficulty and minimizing cost increases due to structural complexity. A good balance is achieved between optimizing fresh air delivery performance and controlling the manufacturing cost of the fresh air duct.

[0018] This application also provides an air conditioner in which the thread profile corresponding to the flow guide cavity is trapezoidal.

[0019] Thus, the trapezoidal tooth profile of the airflow guide cavity has a specific geometric shape, and its hypotenuse can effectively guide the airflow. When air enters the fresh air duct, under the action of the trapezoidal tooth profile, the airflow is more likely to flow along the spiral airflow guide cavity, forming a stable and regular spiral airflow, thereby reducing airflow turbulence and eddy current generation, improving the fresh air delivery efficiency, and allowing fresh air to enter the room more smoothly. Compared with triangular and rectangular tooth profiles, the trapezoidal tooth profile can better avoid the airflow from concentrating in a certain area of ​​the duct, making full use of the entire cross-section of the duct for air delivery, ensuring the uniformity of airflow throughout the duct, thereby reducing the friction and collision between the airflow and the inner wall of the fresh air duct.

[0020] This application also provides an air conditioner, wherein the angle between the opposite side walls of the air guide cavity and the plane perpendicular to the axis of the fresh air duct is 1°-45°.

[0021] In this way, the angle between the two opposite side walls of the air guide cavity and the plane perpendicular to the axis of the fresh air duct is between 1° and 45°. This allows the air guide cavity to provide sufficient guiding force for the airflow, causing the air to form a stable and moderate spiral motion in the duct, effectively buffering the impact force with the duct wall, reducing frictional resistance and noise, and improving the fresh air delivery efficiency. At the same time, it can also ensure that the fresh air duct has good structural strength, reasonably distribute the airflow pressure, and avoid uneven stress on the duct wall caused by improper angle.

[0022] This application also provides an air conditioner, wherein the width of the thread crest corresponding to the flow guide cavity is L, where L≥1.5mm and L≤6mm.

[0023] This design ensures that the thread crest width L is between 1.5-6mm, providing sufficient structural strength to effectively resist airflow impact and guarantee the long-term stable operation of the guide cavity. Simultaneously, the reasonable width provides an appropriate guiding area for airflow, promoting stable spiral motion, buffering the impact of airflow against the pipe wall, reducing flow resistance and noise, without excessively encroaching on pipe space, thus ensuring sufficient ventilation. Furthermore, this width range is compatible with conventional processing techniques and equipment, effectively controlling material consumption and production costs while ensuring processing accuracy.

[0024] This application also provides an air conditioner in which the thread profile corresponding to the flow guide cavity is arc-shaped.

[0025] In this way, the arc-shaped tooth profile has no sharp edges, allowing airflow to flow more smoothly along the tooth surface, reducing airflow turbulence and eddies, which helps to reduce wind resistance, making the flow of fresh air in the duct more stable, improving ventilation efficiency, and ensuring that fresh air can be evenly delivered to various areas. Furthermore, when airflow encounters the tooth profile, the arc-shaped surface will evenly distribute the impact force of the airflow to the surrounding area, avoiding excessive airflow impact in local areas, thereby reducing airflow wear on the duct wall and noise generation.

[0026] This application also provides an air conditioner in which the reinforcing rib is integrally formed onto the fresh air duct by a blow molding process.

[0027] In this way, the blow molding process integrates the reinforcing ribs with the fresh air duct, resulting in a tight bond between the two without any gaps or weak points. This effectively enhances the structural strength of the fresh air duct, improves its pressure resistance, and makes it less prone to deformation or breakage under high pressure, thus extending the service life of the fresh air duct. Furthermore, the blow molding process is suitable for large-scale production and can be quickly molded, thereby improving production efficiency.

[0028] This application also provides an air conditioner, wherein the indoor unit further includes:

[0029] A fresh air duct connector is fixedly mounted on the rear plate and located at the air inlet. The first end of the fresh air duct is connected to the fresh air duct connector, and the inner wall of the fresh air duct connector is provided with an internal thread adapted to the reinforcing rib.

[0030] In this way, the internal thread and the reinforcing ribs on the fresh air duct work together to achieve a tight connection between the fresh air duct and the fresh air duct joint. This provides greater connection friction and torque resistance, effectively preventing the fresh air duct from loosening or falling off due to external forces (such as airflow impact, vibration, etc.) during use. The tight fit between the reinforcing ribs and the internal thread can also effectively prevent air leakage, ensuring that the airflow flows along the predetermined path, reducing air volume loss and energy consumption caused by leakage, improving the ventilation efficiency and energy-saving effect of the fresh air system, and helping to maintain good indoor air quality and a comfortable environment. Attached Figure Description

[0031] 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.

[0032] Figure 1 This is a schematic diagram of an air conditioner provided in an embodiment of this application;

[0033] Figure 2 This is a schematic diagram of the fresh air duct installed on the rear panel according to an embodiment of this application;

[0034] Figure 3 This is an exploded view of the fresh air duct installed on the rear panel according to an embodiment of this application;

[0035] Figure 4 This is a schematic diagram of the fresh air duct provided in an embodiment of this application;

[0036] Figure 5 This is an exploded view of the fresh air duct connected to the fresh air duct joint provided in the embodiment of this application;

[0037] Figure 6 This is a schematic diagram of a fresh air duct connected to a fresh air duct connector, provided in an embodiment of this application.

[0038] Figure 7 yes Figure 6 Enlarged view of point A in the middle;

[0039] Figure 8 This is a front view of the fresh air duct provided in the embodiment of this application;

[0040] Figure 9 yes Figure 8 Enlarged view of point C in the middle;

[0041] Figure 10 yes Figure 9 A cross-sectional view of the structure in the diagram on a plane perpendicular to the axis of the fresh air duct;

[0042] Figure 11 This is a schematic diagram of the fresh air duct connector provided in an embodiment of this application;

[0043] Figure 12 yes Figure 3 Enlarged view of point B in the middle.

[0044] Explanation of main figure symbols

[0045] 1-Air conditioner;

[0046] 10-Indoor unit; 11-Housing; 11a-Rear panel; 11a1-Air inlet; 11a2-Snap fastener;

[0047] 100 - Fresh air duct; 110 - Airflow guide cavity; 120 - Reinforcing rib;

[0048] 200 - Fresh air duct connector; 210 - Internal thread; 220 - Annular flange;

[0049] 300 - Mounting hole. Detailed Implementation

[0050] 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.

[0051] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "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.

[0052] 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.

[0053] 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.

[0054] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components whose specific types and structures may be the same or different, 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.

[0055] As mentioned in the background section, fresh air ducts are usually made with a corrugated cross-section. However, this structure has obvious drawbacks. On the one hand, the corrugated inner wall makes the air flow path complicated when it flows in the fresh air duct, causing it to fluctuate up and down, increasing wind resistance and reducing the fresh air volume. On the other hand, when the wind speed is high, the air is very likely to form vortices on the inner wall of the fresh air duct, which will generate a whistling sound and affect the user experience.

[0056] To address the aforementioned issues, this application provides an air conditioner in which a spiral-shaped guide cavity is provided on the inner wall of the fresh air duct. The guide cavity is connected to the inner cavity of the fresh air duct, reducing disordered collisions between air and the duct wall and avoiding additional resistance caused by airflow turbulence. This improves the airflow efficiency within the fresh air duct and reduces the possibility of vortices forming due to concentrated airflow. Consequently, it avoids the occurrence of whistling noise caused by vortices forming on the duct wall when the wind speed is high, enabling the fresh air duct to achieve efficient and low-noise fresh air delivery.

[0057] The following will describe specific embodiments and appendices. Figure 1-10 The technical solution of the air conditioner in this application will be further explained.

[0058] like Figure 1 As shown, the air conditioner 1 includes an indoor unit 10, which is the part of the air conditioning system installed indoors. It is mainly responsible for delivering treated air to the indoor space to achieve functions such as regulating indoor temperature, humidity and air quality.

[0059] like Figure 1As shown, the indoor unit 10 may include a housing 11. The housing 11 of the indoor unit 10 typically houses components such as an evaporator, a fan, a drain pan, an electrical control board, and a temperature sensor. The evaporator is used for heat exchange, the fan drives air circulation, the drain pan collects condensate, the electrical control board is responsible for controlling the operation, and the temperature sensor monitors the indoor temperature so that the indoor unit 10 can perform its relevant functions.

[0060] like Figure 2 and Figure 3 As shown, the housing 11 includes a rear plate 11a, on which an air inlet 11a1 is provided.

[0061] The indoor unit 10 may also include a fresh air module, which is located inside the housing 11 and connected to the air inlet 11a1. The fresh air module is used to introduce outdoor air into the housing 11 through the air inlet 11a1 and deliver it to the indoor space. The fresh air module can deliver fresh outdoor air to the room after filtration, purification and other treatments to improve indoor air quality and keep the air fresh.

[0062] like Figures 2 to 7 As shown, the indoor unit 10 may also include a fresh air duct 100. The first end of the fresh air duct 100 is fixedly mounted on the rear panel 11a and connected to the air inlet 11a1. The second end of the fresh air duct 100 faces the outside. The fresh air duct 100 is used to introduce and guide outdoor air to the air inlet 11a1 so that outdoor air enters the fresh air module. The inner wall of the fresh air duct 100 is provided with a spiral-shaped guide cavity 110, which is connected to the inner cavity of the fresh air duct 100.

[0063] When the fresh air function is activated, outdoor air enters the fresh air duct 100 from the second end of the fresh air duct 100 under the power drive of the fresh air module. The outdoor air flows along the inner wall of the fresh air duct 100 towards the first end. During this process, since the guide cavity 110 is connected to the inner cavity of the fresh air duct 100, the air will be guided into the guide cavity 110 after entering the fresh air duct 100. As the guide cavity 110 spirals, a spiral airflow is formed in the fresh air duct 100. The spiral airflow continues to rotate and move forward along the inner wall of the fresh air duct 100, and finally enters the fresh air module through the air inlet 11a1 on the rear plate 11a after passing through the first end of the fresh air duct 100.

[0064] Thus, the spiral-shaped airflow guiding cavity 110 can guide the air into a spiral airflow. The spiral airflow decomposes the impact force between the air and the wall of the fresh air duct 100 into a component force along the tangential direction of the spiral and a component force pointing towards the center of the spiral. This means that when the airflow encounters the duct wall or obstacles, it no longer concentrates on a certain point or area to generate a strong impact, but gradually buffers and adapts along the spiral path, effectively reducing the local impact force. On the one hand, it reduces the disorderly collision between the air and the wall of the fresh air duct 100, avoiding additional resistance caused by airflow turbulence, thereby improving the airflow efficiency in the fresh air duct 100 and ensuring that fresh air can enter the fresh air module more smoothly. On the other hand, the spiral airflow makes the air evenly distributed in the fresh air duct 100, reducing the possibility of vortices formed due to concentrated airflow. This avoids the situation where vortices are formed on the wall of the fresh air duct 100 when the wind speed is high, resulting in whistling noise, and achieves low-noise fresh air delivery.

[0065] In some possible embodiments, such as Figures 4 to 7 As shown, the fresh air duct 100 has a reinforcing rib 120, which is spirally protruding on the outer surface of the fresh air duct 100 along the extension direction of the fresh air duct 100, and a flow guiding cavity 110 is formed inside the reinforcing rib 120.

[0066] By protruding spiral reinforcing ribs 120 on the outer surface of the fresh air duct 100, the reinforcing ribs 120 can effectively resist external pressure during installation and use, thereby preventing the fresh air duct 100 from deforming and ensuring that the fresh air duct 100 maintains a stable shape and function.

[0067] Furthermore, compared to directly etching the flow guiding cavity 110 on the inner wall of the fresh air duct 100, this embodiment forms the flow guiding cavity 110 inside by setting a spiral reinforcing rib 120 on the outer surface of the fresh air duct 100. While achieving the same flow guiding and reinforcing functions, the spiral reinforcing rib 120 structure is easy to process and can be manufactured in one step through processes such as mold forming, without the need to add complex internal structure processing steps, reducing processing difficulty and thus improving production efficiency.

[0068] In some possible embodiments, such as Figure 8 As shown, along the extension direction of the fresh air duct 100, the angle between the tangent of the spiral line corresponding to the air guide cavity 110 and the tangent of the cross-sectional circumference of the fresh air duct 100 is 5°-30°.

[0069] In this context, the angle between the tangent of the spiral line of the air guide cavity 110 and the tangent of the cross-sectional circumference of the air guide cavity 100 along the extension direction of the fresh air duct 100 can be understood as the helix angle of the spiral line corresponding to the air guide cavity 110.

[0070] When the angle between the tangent of the spiral of the flow cavity and the tangent of the cross-sectional circumference of the fresh air duct 100 is less than 5°, the spiral is relatively gentle and the airflow rotates less in the duct. Although it can guide the airflow to move forward in an orderly manner along the duct axis to a certain extent, it will cause the airflow to rotate too slowly, resulting in a reduction in the fresh air delivery speed.

[0071] When the angle between the tangent of the spiral of the flow cavity and the tangent of the cross-sectional circumference of the fresh air duct 100 is greater than 30°, the spiral is steeper, and the air is more strongly guided by the spiral in the flow cavity 110, resulting in a faster rotation speed. However, the friction between the high-speed rotating airflow and the inner wall of the fresh air duct 100 is intensified, leading to more energy loss and conversion into heat energy, which reduces the efficiency of fresh air delivery. In addition, the excessively fast rotation speed can easily cause the airflow to generate strong centrifugal force, causing the airflow to concentrate on the outside of the duct wall, forming a low-pressure area in the central area of ​​the duct, which in turn triggers vortex phenomena. This not only increases the airflow resistance but also generates greater noise.

[0072] In this embodiment, the angle between the tangent of the spiral of the flow cavity and the tangent of the cross-sectional circumference of the fresh air duct 100 is between 5 and 30°, so that the steepness of the spiral is moderate. This provides sufficient rotational power for the airflow, ensuring that the air moves forward spirally in the duct at a reasonable speed, avoiding low delivery efficiency due to slow rotation. It also effectively controls the degree of friction between the airflow and the duct wall, reducing energy loss and noise generation. At the same time, the moderate spiral guidance effect can make the airflow evenly distributed in the duct, reducing the risk of vortex formation, maintaining a stable airflow pattern, and ensuring that fresh air can be smoothly delivered to the fresh air module with high efficiency, low energy consumption, and low noise.

[0073] In some possible embodiments, such as Figure 8 and Figure 9 As shown, the pitch of the guide cavity 110 is 3-12mm.

[0074] The pitch corresponding to the flow guide cavity 110 should be understood as the axial distance between two adjacent turns of the spiral line corresponding to the spiral flow guide cavity 110 in the fresh air duct. Figure 9 The distance indicated by d in the middle.

[0075] If the pitch of the guide cavity 110 is less than 3mm, the spiral structure is too dense. On the one hand, the airflow frequently turns in the narrow spiral channel, and the contact area with the cavity wall increases significantly, resulting in a sharp increase in the frictional resistance between the air and the wall. This not only consumes a lot of energy, but also significantly reduces the fresh air delivery efficiency. On the other hand, the dense spiral structure requires high processing precision, which increases the difficulty and cost of processing and manufacturing.

[0076] If the pitch of the guide cavity 110 is greater than 12mm, the spiral structure is too sparse, and the airflow is difficult to form a stable spiral shape. Due to the weakened spiral guiding effect, the air is prone to disordered flow in the duct, which cannot effectively buffer the impact force with the duct wall, thus generating greater noise and additional resistance. At the same time, the sparse spiral structure is difficult to distribute the airflow evenly, which can easily cause local airflow concentration, thereby forming eddies, resulting in reduced fresh air delivery efficiency and affecting the overall performance of the fresh air system.

[0077] In this embodiment, the pitch of the guide cavity 110 is between 3-12mm to ensure that the pitch is moderate. This allows the airflow to be stably guided in the duct, forming an orderly spiral airflow, effectively reducing friction between the air and the duct wall and internal collision losses, thus ensuring the efficiency of fresh air delivery. At the same time, it can reasonably control the rotation intensity of the airflow, avoiding excessive friction caused by too small a pitch or airflow turbulence caused by too large a pitch. Furthermore, this pitch range has good operability in processing and manufacturing, which reduces the processing difficulty and the cost increase caused by structural complexity. A good balance is achieved between optimizing the performance of fresh air delivery and controlling the manufacturing cost of the fresh air duct 100.

[0078] In some possible embodiments, such as Figures 8 to 10 As shown, the thread profile corresponding to the flow guide cavity 110 is trapezoidal.

[0079] The thread profile of the guide cavity 110 is trapezoidal. This should be understood as follows: if the guide cavity 110 is cut open along the direction perpendicular to the axis of the fresh air duct, the cross section of each turn of the internal spiral structure is trapezoidal, the thread crest (widest part) and the thread root (narrowest part) are parallel, and the two side walls are inclined.

[0080] Thus, the trapezoidal tooth-shaped guide cavity 110 has a specific geometric shape, and its hypotenuse can effectively guide the airflow. When air enters the fresh air duct 100, under the action of the trapezoidal tooth shape, the airflow is more likely to flow along the spiral guide cavity 110, forming a stable and regular spiral airflow, thereby reducing airflow turbulence and eddy current generation, improving fresh air delivery efficiency, and allowing fresh air to enter the room more smoothly. Compared with triangular and rectangular tooth shapes, the trapezoidal tooth shape can better avoid airflow concentrating in a certain area of ​​the duct, making full use of the entire cross-section of the duct for air delivery, ensuring the uniformity of airflow throughout the duct, thereby reducing friction and collision between the airflow and the inner wall of the fresh air duct 100.

[0081] In some possible embodiments, such as Figures 8 to 10 As shown, the angle between the opposite side walls of the air guiding cavity 110 and the plane perpendicular to the axis of the fresh air duct 100 is 1°-45°.

[0082] The angle formed between the opposite side walls of the air guiding cavity 110 and the plane perpendicular to the axis of the fresh air duct 100 is... Figure 10 The included angle referred to by 'a'.

[0083] If the angle between the opposite side walls of the guide cavity 110 and the plane perpendicular to the axis of the fresh air duct 100 is less than 1°, and the side walls of the guide cavity 110 are nearly parallel to the cross-section of the fresh air duct 100, then the spiral guiding effect of the guide cavity 110 on the airflow is weak. After the air enters the duct, it is difficult to form an effective spiral motion, and the advantages of the spiral airflow in buffering the impact force and reducing friction noise cannot be fully utilized. The airflow will still collide with the duct wall in a relatively turbulent state, resulting in increased local resistance, increased noise, and reduced fresh air delivery efficiency. Furthermore, the small angle makes the structural features of the guide cavity 110 indistinct, and it is difficult to reflect its structural advantages compared with ordinary ducts during the manufacturing process, increasing processing costs without achieving the expected performance improvement.

[0084] If the angle between the opposite side walls of the air guide cavity 110 and the plane perpendicular to the axis of the fresh air duct 100 is greater than 45°, the side walls of the air guide cavity 110 are too inclined, which will cause the airflow to be subjected to strong lateral compression when entering the air guide cavity 110, resulting in uneven airflow velocity distribution and the formation of strong vortices and turbulence inside the duct. This will not only significantly increase airflow resistance, but also intensify the collision and friction between air molecules, generating a lot of noise. Furthermore, an excessively large angle will weaken the structural strength of the fresh air duct 100, and the component of the airflow pressure on the side walls in the direction perpendicular to the duct wall will increase, which will easily cause deformation or even damage to the duct wall and shorten the service life of the fresh air duct 100.

[0085] In this embodiment, the angle between the opposite side walls of the air guiding cavity 110 and the plane perpendicular to the axis of the fresh air duct 100 is between 1° and 45°. This allows the air guiding cavity 110 to provide sufficient guiding force for the airflow, causing the air to form a stable and moderate spiral motion in the duct, effectively buffering the impact force with the duct wall, reducing frictional resistance and noise, and improving the fresh air delivery efficiency. At the same time, it ensures that the fresh air duct 100 has good structural strength, reasonably disperses the airflow pressure, and avoids uneven stress on the duct wall caused by improper angle.

[0086] In some possible embodiments, such as Figures 8 to 10 As shown, the width of the thread crest corresponding to the flow guide cavity 110 is L, where L≥1.5mm and L≤6mm.

[0087] If the thread crest width L corresponding to the guide cavity 110 is less than 1.5mm, from a structural strength perspective, the excessively narrow crest cannot withstand the lateral pressure generated by the airflow. Under long-term high-speed airflow scouring, the thread edge is prone to wear, deformation, or even breakage, leading to the failure of the guide cavity 110 and affecting the stability and service life of the fresh air system. In terms of airflow guidance, the narrow crest cannot provide sufficient contact area and guiding force for the airflow. When the air passes through the guide cavity 110, it is difficult to form a stable spiral motion, increasing the degree of airflow turbulence and intensifying the collision with the pipe wall, resulting in a significant increase in airflow resistance, increased noise, and a significant reduction in fresh air delivery efficiency. In addition, in the processing and manufacturing process, the excessively narrow crest requires high processing precision, increasing the processing difficulty.

[0088] If the thread crest width L > 6mm, the excessively wide crest will occupy too much internal space of the pipe, resulting in a reduction in the effective ventilation cross-sectional area, which restricts the flow of fresh air and directly reduces the fresh air delivery efficiency. In addition, the wide crest will cause the airflow to form a large vortex area near the crest, making the airflow pattern complex and turbulent, increasing the internal friction loss and flow resistance of the air, and thus generating additional noise.

[0089] In this embodiment, the thread crest width L is between 1.5-6mm. The thread crest has sufficient structural strength to effectively resist airflow impact and ensure the long-term stable operation of the guide cavity 110. At the same time, the reasonable width provides an appropriate guiding area for airflow, which can promote the formation of stable spiral motion of air, buffer the impact force of airflow on the pipe wall, reduce flow resistance and noise, and avoid excessively occupying pipe space, thus ensuring sufficient ventilation. In addition, this width range is compatible with conventional processing technology and equipment, effectively controlling material consumption and production costs while ensuring processing accuracy.

[0090] In some possible embodiments, the thread profile corresponding to the flow guide cavity 110 is arc-shaped.

[0091] In this way, the arc-shaped tooth profile has no sharp edges, allowing airflow to flow more smoothly along the tooth surface, reducing airflow turbulence and eddies, which helps to reduce wind resistance, making the flow of fresh air in the duct more stable, improving ventilation efficiency, and ensuring that fresh air can be evenly delivered to various areas. Furthermore, when airflow encounters the tooth profile, the arc-shaped surface will evenly distribute the impact force of the airflow to the surrounding area, avoiding excessive airflow impact in local areas, thereby reducing airflow wear on the duct wall and noise generation.

[0092] In some possible embodiments, the reinforcing rib 120 is integrally formed onto the fresh air duct 100 by a blow molding process.

[0093] In this way, the blow molding process integrates the reinforcing rib 120 with the fresh air duct 100, resulting in a tight bond between the two without any gaps or weak points. This effectively enhances the structural strength of the fresh air duct 100, improves its compressive strength, and makes it less prone to deformation or breakage under high pressure, thus extending the service life of the fresh air duct 100. Furthermore, the blow molding process is suitable for large-scale production and can be rapidly formed, thereby improving production efficiency.

[0094] Of course, the method of forming the reinforcing rib 120 on the fresh air duct 100 is not limited to blow molding. For example, it can also be extrusion molding or thermoforming.

[0095] In some possible embodiments, such as Figure 3 , Figure 5 as well as Figure 6 As shown, the indoor unit 10 also includes a fresh air duct connector 200, which is fixedly mounted on the rear plate 11a and located at the air inlet 11a1. The first end of the fresh air duct 100 is connected to the fresh air duct connector 200, and the inner wall of the fresh air duct connector 200 is provided with an internal thread 210 that is compatible with the reinforcing rib 120.

[0096] Thus, the internal thread 210 and the reinforcing rib 120 on the fresh air duct 100 cooperate with each other to achieve a tight connection between the fresh air duct 100 and the fresh air duct connector 200. This provides greater connection friction and torque resistance, effectively preventing the fresh air duct 100 from loosening or falling off due to external forces (such as airflow impact, vibration, etc.) during use. The tight fit between the reinforcing rib 120 and the internal thread 210 can also effectively prevent air leakage, ensuring that the airflow flows along the predetermined path, reducing air volume loss and energy consumption caused by leakage, improving the ventilation efficiency and energy-saving effect of the fresh air system, and helping to maintain good indoor air quality and a comfortable environment.

[0097] Furthermore, during installation, simply align the first end of the fresh air duct 100 with the fresh air duct connector 200, and then rotate it to engage the reinforcing rib 120 with the internal thread 210 to complete the connection. The operation is simple and quick, which can shorten the installation time and improve the installation efficiency.

[0098] In addition, such as Figure 3 , Figure 11 as well as Figure 12As shown, to achieve a reliable connection between the fresh air duct connector 200 and the rear plate 11a, a buckle 11a2 with an elastic arm can be installed on the rear plate 11a. The end of the buckle 11a2 is provided with a barb structure. An annular flange 220 that cooperates with the barb is provided in the circumference of the fresh air duct connector 200. During installation, the fresh air duct connector 200 is pushed towards the buckle 11a2, and the elastic arm is deformed under pressure. When the annular flange 220 is aligned with the barb, the elastic arm returns to its original position, and the barb is inserted into the flange to complete the snap-fit. Multiple mounting holes 300 are opened at corresponding positions on the rear plate 11a and the fresh air duct connector 200, and fasteners are used to fix them through these holes.

[0099] In this way, the snap-fit ​​allows for quick initial positioning of the fresh air duct connector 200 without the need for complex measurement and alignment operations, reducing installation difficulty and shortening installation time. Meanwhile, the fasteners further enhance the connection strength, ensuring that the fresh air duct connector 200 is tightly fixed to the back plate 11a.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the air conditioner of this application, and are not intended to limit it. Although the air conditioner of 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 air conditioner, characterized in that, include: Indoor unit, the indoor unit includes: Housing, the housing comprising: The rear panel is provided with an air inlet; A fresh air module is disposed inside the housing and is connected to the air inlet. The fresh air module is used to introduce outdoor air into the housing through the air inlet and deliver it to the indoor space. The fresh air duct has its first end fixedly mounted on the rear plate and connected to the air inlet. The second end of the fresh air duct faces the outside. The fresh air duct is used to introduce and guide outdoor air to the air inlet so that outdoor air enters the fresh air module. The inner wall of the fresh air duct is provided with a spiral-shaped guide cavity, and the guide cavity is connected to the inner cavity of the fresh air duct.

2. The air conditioner according to claim 1, characterized in that, The fresh air duct has reinforcing ribs that are spirally protruding from the outer surface of the fresh air duct along its extension direction, and the guide cavity is formed inside the reinforcing ribs.

3. The air conditioner according to claim 1 or 2, characterized in that, Along the extension direction of the fresh air duct, the angle between the tangent of the spiral line corresponding to the air guide cavity and the tangent of the cross-sectional circumference of the fresh air duct is 5°-30°.

4. The air conditioner according to claim 1 or 2, characterized in that, The pitch corresponding to the flow guide cavity is 3-12mm.

5. The air conditioner according to claim 1 or 2, characterized in that, The thread profile corresponding to the flow guide cavity is trapezoidal.

6. The air conditioner according to claim 5, characterized in that, The angle between the opposite side walls of the air guide cavity and the plane perpendicular to the axis of the fresh air duct is 1°-45°.

7. The air conditioner according to claim 5, characterized in that, The width of the thread crest corresponding to the flow guide cavity is L, where L≥1.5mm and L≤6mm.

8. The air conditioner according to claim 1 or 2, characterized in that, The thread profile corresponding to the flow guiding cavity is arc-shaped.

9. The air conditioner according to claim 2, characterized in that, The reinforcing ribs are integrally formed onto the fresh air duct using a blow molding process.

10. The air conditioner according to claim 2, characterized in that, The indoor unit also includes: The fresh air duct connector is fixedly installed on the rear plate and located at the air inlet. The first end of the fresh air duct is connected to the fresh air duct connector, and the inner wall of the fresh air duct connector is provided with an internal thread that matches the reinforcing rib.

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