Noise reduction air outlet device and bath heater

Abstract

The noise reduction air outlet device comprises a shell, a first side wall and a second side wall which are arranged in a spaced mode are arranged in the shell, a first air channel is formed between the first side wall and the second side wall, the first air channel is provided with a first air outlet, and the first side wall is provided with an air inlet communicated with the first air channel; a reflecting structure which extends in the airflow flowing direction of the first air duct and is concave inwards in the direction away from the first side wall is arranged on the second side wall close to the air inlet area; part of airflow entering from the air inlet is guided and reflected to the first side wall through the reflection structure and is repeatedly reflected between the first side wall and the second side wall, noise reduction is achieved through sound energy superposition attenuation, and finally the airflow is exhausted from the first air outlet. Sound energy superposition attenuation is achieved by optimizing an airflow reflection path, and the requirement for reducing noise without additionally arranging a silencing component is met.

Description

Technical Field

[0001] This invention relates to the field of bathroom fixtures, specifically to a noise-reducing air outlet device and a bathroom heater. Background Technology

[0002] Bathroom heaters use a fan to drive airflow through a heating element to raise the temperature. Existing bathroom heaters suffer from uneven airflow and short airflow distance, which can cause some areas to be too hot while others are too cold. They also have relatively high operating noise, affecting the user experience. While bathroom heaters have improved in terms of functional integration, they still have practical deficiencies in airflow delivery and noise reduction design.

[0003] To ensure heating efficiency and airflow coverage, existing space heaters typically use high-powered fans to drive airflow. However, this airflow generates aerodynamic and turbulent noise within the duct, which, when combined, still results in significant noise pollution. Furthermore, the inability to create a controlled airflow perpetuates uneven airflow and localized temperature imbalances, limiting the airflow distance and creating temperature dead zones in bathroom corners. In addition, current noise reduction methods often rely on adding sound-absorbing components, which increases duct resistance. Maintaining the desired airflow requires further increases in fan power, leading to higher energy consumption and making it difficult to simultaneously achieve low noise, uniform airflow, and energy efficiency. Summary of the Invention

[0004] The main objective of this invention is to overcome the high noise level in existing technologies and propose a noise-reducing air outlet device and a bathroom heater. By optimizing the airflow reflection path, sound energy is superimposed and attenuated, thus achieving the goal of reducing noise without the need for additional silencing components.

[0005] The present invention adopts the following technical solution:

[0006] A noise reduction air outlet device includes a housing, within which are spaced-apart first and second sidewalls. A first air duct is formed between the first and second sidewalls, and the first air duct has a first air outlet. The first sidewall has an air inlet communicating with the first air duct. A reflective structure is provided on the second sidewall near the air inlet, extending along the airflow direction of the first air duct and concave inward toward the direction away from the first sidewall. Part of the airflow entering through the air inlet is guided and reflected to the first sidewall by the reflective structure, and repeatedly reflected between the first and second sidewalls, achieving noise reduction through sound energy superposition and attenuation, and finally discharged from the first air outlet.

[0007] The reflective structure includes at least one first arc surface, which is circumferentially arranged around the central axis of the air inlet, and the first arc surface is concave inward in the direction away from the first sidewall.

[0008] The curvature of the first arc surface gradually decreases along the airflow direction of the first air duct; the area of ​​the outer periphery of the air inlet of the first sidewall opposite to the first arc surface is set as a plane, and the plane extends radially along the shell.

[0009] The first air outlet extends circumferentially along the housing; it also includes an air guide ring, which is installed on the first air outlet to divide the first air outlet into an inner air outlet ring and an outer air outlet ring in the radial direction of the housing.

[0010] The inner air outlet ring is provided with a plurality of first guide plates spaced apart along the circumference of the housing, and the outer air outlet ring is provided with a plurality of second guide plates spaced apart along the circumference of the housing; along the axial direction of the housing, the first guide plates and the second guide plates are inclined in opposite directions, one of them extending outward in a clockwise direction from the side where the first air duct is located, and the other extending outward in a counterclockwise direction from the side where the first air duct is located.

[0011] The first sidewall and the second sidewall are provided with a second arc surface in the area near the first air outlet, and the second arc surface extends circumferentially along the housing; the second arc surface on the first sidewall is concave inward in the direction away from the second sidewall.

[0012] The first sidewall and the second sidewall are provided with a second arc surface in the area near the first air outlet, and the second arc surface extends circumferentially along the housing; the second arc surface on the second sidewall protrudes outward toward the direction near the first sidewall.

[0013] The housing includes a detachable fixed connection base and an air guide plate; the inner wall of the air guide plate facing the base constitutes the first side wall of the first air duct; the inner wall of the base facing the air guide plate is spaced apart from the first side wall, correspondingly constituting the second side wall of the first air duct.

[0014] A bathroom heater includes a main unit and a fan. The main unit has a second air duct extending along its length. The fan is installed on the main unit and located at the air inlet of the second air duct. The main unit has an installation port. It also includes the aforementioned noise reduction air outlet device, which is installed at the installation port. The air inlet is connected to the second air duct so that airflow flows from the second air duct to the first air duct.

[0015] The cross-sectional area of ​​the air inlet is smaller than the cross-sectional area of ​​the air inlet end of the second air duct; the cross-sectional area of ​​the first air outlet is smaller than the cross-sectional area of ​​the air inlet.

[0016] The main unit is provided with an air guide seat and a heating element at the mounting port; the air guide seat is provided with a mounting groove and several air guide holes, the air guide holes extend along the axial direction of the housing and communicate with the first air duct, the mounting groove is located at the air inlet end of the air guide hole and communicates with the air guide hole; the heating element is installed in the mounting groove.

[0017] As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In this invention, by setting a concave reflective structure in the air inlet area corresponding to the second side wall, and making the airflow reflect multiple times between the first side wall and the second side wall, the sound energy is superimposed and attenuated, effectively reducing airflow noise and improving the quietness of the air outlet from the source.

[0019] 2. In this invention, by setting the first air outlet as an annular structure extending circumferentially along the shell, and cooperating with the air guide ring to radially divide it into an inner air outlet ring and an outer air outlet ring, the airflow is guided in a radial direction, thereby improving the controllability of the air outlet structure and the rationality of the air supply layout.

[0020] 3. In this invention, by setting a first guide plate and a second guide plate that are inclined along the axial direction of the shell and extend in opposite directions on the inner and outer air outlet rings, the inner airflow and the outer airflow discharged through the two air outlet rings form a radial movement trend in opposite directions. One tends to converge radially inward, and the other tends to diffuse radially outward, thus forming a double-layer three-dimensional air supply mode with the inner and outer rings moving in opposite directions. This effectively expands the overall air supply coverage, reduces air supply dead zones in the application scenario, and improves the uniformity of air supply.

[0021] 4. In this invention, by setting concave and convex second arc surfaces in the areas of the first and second sidewalls near the first air outlet, respectively, and making the curvatures of the two different, they cooperate to form a closing structure, so as to achieve uniform gathering of airflow and stable flow velocity, improve the uniformity of air outlet, reduce energy loss, and extend the effective air delivery distance.

[0022] 5. In this invention, by forming a stepped cross-sectional area decreasing structure between the air inlet and the first air outlet, that is, the cross-sectional area of ​​the second air duct inlet is larger than the cross-sectional area of ​​the air inlet and the cross-sectional area of ​​the air inlet is larger than the cross-sectional area of ​​the first air outlet, two airflow pressurizations are achieved, enhancing the airflow energy and penetration. Combined with the three-dimensional air supply mode, it ensures that the long-distance air supply still maintains uniform coverage. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of the noise reduction air outlet device of the present invention;

[0024] Figure 2 This is a schematic diagram of the seat structure of the present invention;

[0025] Figure 3 This is a structural diagram of the air guide plate;

[0026] Figure 4 This is a structural diagram of the air guide ring;

[0027] Figure 5 This is a structural diagram of the bathroom heater of the present invention;

[0028] Figure 6 This is a diagram of the internal structure of the host computer.

[0029] Figure 7 for Figure 6 Top view;

[0030] Figure 8 for Figure 5 Top view;

[0031] Figure 9 for Figure 8 AA cross-sectional view (air supply mode);

[0032] Figure 10 for Figure 8 AA section view;

[0033] Figure 11 for Figure 8 AA cross-sectional view (ventilation mode);

[0034] Figure 12 This is a schematic diagram of the air supply mode of the bathroom heater of the present invention.

[0035] 10. Housing; 11. First air duct; 12. Air inlet; 13. First air outlet; 14. First side wall; 15. Second side wall; 15a. Reflective structure; 16. First arc surface; 17. Plane; 18. Second arc surface; 19. Inner air outlet ring; 20. Outer air outlet ring; 21. Air guide ring; 22. First guide plate; 23. Second guide plate; 24. Base; 25. Air guide plate; 26. Groove; 28. Main unit; 29. ​​Fan; 30. Second air duct; 31. Mounting port; 32. Second air outlet; 33. Air guide plate; 34. Drive component; 35. Air guide seat; 36. Heating element; 37. Mounting groove; 38. Air guide hole.

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Detailed Implementation

[0037] The present invention will be further described below through specific embodiments.

[0038] See Figures 1 to 4A noise reduction air outlet device includes a housing 10 with an inner cavity. The inner cavity of the housing 10 has a first sidewall 14 and a second sidewall 15 spaced apart from each other. A first air duct 11 is formed between the first sidewall 14 and the second sidewall 15. The first air duct 11 has a first air outlet 13 as an airflow output channel, and the first sidewall 14 has an air inlet 12 communicating with the first air duct 11 as an airflow input channel. A reflective structure 15a is provided on the second sidewall 15 near the air inlet 12, extending along the airflow direction of the first air duct 11 and concave inwards away from the first sidewall 14. Part of the airflow entering through the air inlet 12 flows along the first sidewall 14 and the second sidewall 15 to the first air outlet 13, while part is guided and reflected by the reflective structure to the first sidewall 14. The airflow repeatedly reflects between the first sidewall 14 and the second sidewall 15, achieving noise reduction through sound energy superposition and attenuation, and finally exits from the first air outlet 13. (See [reference]). Figure 10 .

[0039] The air inlet 12 and the first air outlet 13 can be located on opposite sides of the housing 10 along the axial direction, or the air inlet 12 can be located on one side of the housing 10 in the radial direction, and the first air outlet 13 can be located on one side of the housing 10 in the axial direction. The first air duct 11 extends from the air inlet 12 along the radial and / or axial direction of the housing 10 toward the first air outlet 13, forming a radially widened and / or axially extended channel structure. The first air outlet 13 is specifically formed between the ends of the first sidewall 14 and the second sidewall 15 away from the air inlet 12.

[0040] The reflective structure includes at least one first arc surface 16, which is circumferentially arranged around the central axis of the air inlet 12. The first arc surface 16 is concave inward along the axial direction of the housing 10, away from the first sidewall 14; that is, the first arc surface 16 is smoothly concave. Part of the airflow entering the first air duct 11 through the air inlet 12 directly acts on the concave portion of the first arc surface 16, and is reflected to the corresponding first sidewall 14 under the guidance of the concave surface. Subsequently, the airflow undergoes multiple reflections between the first sidewall 14 and the second sidewall 15. The first arc surface 16 can be a single annular arc surface extending circumferentially around the central axis of the air inlet 12, or at least two arc surfaces circumferentially distributed around the central axis of the air inlet 12. The figure shows two first arc surfaces 16 as an example.

[0041] In this embodiment, the curvature of the first arc surface 16 gradually decreases along the airflow direction of the first air duct 11, forming a smoothly transitioned concave surface. Correspondingly, on the first sidewall 14, the area located on the outer periphery of the air inlet 12 and opposite to the first arc surface 16 is designated as a plane 17, which extends radially along the housing 10. In the radial direction of the housing 10, the maximum distance between the outermost edge of the first arc surface 16 and the central axis of the air inlet 12 is greater than the maximum radial dimension of the air inlet 12 itself.

[0042] The above structural design achieves the dual effects of noise reduction and airflow optimization by coordinating the curved surface and the plane to match the airflow movement law: the first curved surface 16 with gradually changing curvature guides the airflow entering the air duct, avoiding disorderly airflow diffusion, and at the same time reducing the severe turbulent impact between the airflow and the air duct wall, thereby reducing the generation of aerodynamic noise and turbulent noise from the source; on the other hand, the plane 17 structure of the first side wall 14 provides a stable working surface for reflecting airflow. Combined with the guiding effect of the first curved surface 16, the airflow can form multiple reciprocating reflections between the first side wall 14 and the second side wall 15. The sound waves propagate synchronously with the airflow and superimpose interference at the reflection interface. Some of the sound energy cancels each other out, and the remaining sound energy gradually attenuates after multiple reflections, ultimately reducing the noise intensity of the air outlet from the source.

[0043] Furthermore, the regions of the first sidewall 14 and the second sidewall 15 near the first air outlet 13 are provided with second arc surfaces 18, which extend circumferentially along the housing 10. The second arc surface 18 on the first sidewall 14 is concave inward in the direction away from the second sidewall 15, forming a smooth concave shape; the second arc surface 18 on the second sidewall 15 is convex outward in the direction close to the first sidewall 14, forming a smooth convex shape. The curvatures of the two second arc surfaces 18 are different, with the curvature of the second arc surface 18 on the first sidewall 14 being greater than that on the second arc surface 18 on the second sidewall 15. The second arc surfaces 18 are circular arcs, elliptical arcs, or conical surfaces, etc. Together, the two second arc surfaces 18 form a converging structure facing the first air outlet 13. The concave arc surface of the first sidewall 14 constrains the airflow, while the convex arc surface of the second sidewall 15 gently gathers the airflow. The combination of these two elements makes the airflow velocity at the first air outlet 13 more uniform, improving the uniformity of the airflow. The converging structure allows the airflow to be concentrated and discharged, reducing energy loss and extending the air delivery distance.

[0044] In this embodiment, the first air outlet 13 extends circumferentially along the housing 10, forming a ring shape, such as a square ring, a circular ring, an elliptical ring, or other polygonal ring. See also Figure 4 The noise reduction air outlet device also includes an air guide ring 21, which is installed at the first air outlet 13. The shape of the air guide ring 21 is adapted to the shape of the first air outlet 13. The first air outlet 13 is divided into an inner air outlet ring 19 and an outer air outlet ring 20 in the radial direction of the housing 10. The ring width of the two regions is set according to the airflow distribution ratio at the end of the air duct to match the airflow distribution requirements of different regions.

[0045] Furthermore, the inner air outlet ring 19 is provided with a plurality of first guide plates 22 spaced apart along the circumference of the housing 10. Each first guide plate 22 is connected to the inner wall of the inner air outlet ring 19, for example, to the air guide ring 21 or to a corresponding position of the second side wall 15. The outer air outlet ring 20 is provided with a plurality of second guide plates 23 spaced apart along the circumference of the housing 10. Each second guide plate 23 is connected to the inner wall of the outer air outlet ring 20, for example, to the air guide ring 21 or to a corresponding position of the first side wall 14. Along the axial direction of the housing 10, the first guide plates 22 and the second guide plates 23 have opposite inclination directions. One extends outward from the side where the first air duct 11 is located in a clockwise direction, and the other extends outward from the side where the first air duct 11 is located in a counterclockwise direction.

[0046] By setting a first guide plate 22 and a second guide plate 23 that are inclined along the axial direction of the housing and extend in opposite directions on the inner air outlet ring 19 and the outer air outlet ring 20 respectively, the inner airflow and the outer airflow discharged through the two air outlet rings form a radial movement trend in opposite directions. One tends to converge radially inward, and the other tends to diffuse radially outward. This forms a double-layer three-dimensional air supply mode with the inner and outer rings moving in opposite directions, which can expand the overall air supply coverage, reduce air supply dead zones in the application scenario, and improve the uniformity of air supply.

[0047] Specifically, along the axial direction of the housing 10, the first guide plate 22 extends outward in a clockwise direction from the side where the first air duct 11 is located. This clockwise tilting arrangement applies a radially inward guiding force to the airflow entering the inner air outlet ring 19, causing the inner airflow to converge towards the center of the first air outlet 13 during discharge, effectively avoiding the problem of air dispersion caused by the radial outward diffusion of the inner airflow. Along the axial direction of the housing 10, the second guide plate 23 extends outward in a counterclockwise direction from the side where the first air duct 11 is located. This counterclockwise tilting arrangement applies a radially outward guiding force to the airflow entering the outer air outlet ring 20, causing the outer airflow to diffuse radially outward during discharge, forming a wider coverage area for air delivery. See also... Figure 12 The diffused airflow of the outer air outlet ring 20 and the converged airflow of the inner air outlet ring 19 form a double-layer three-dimensional rotating air supply mode with the inner ring rotating clockwise to converge and the outer ring rotating counterclockwise to diffuse. This mode not only strengthens the airflow coordination between the central area and the outer area, but also further expands the overall air supply coverage through the diffusion and convergence effect of the rotating airflow, allowing the airflow to penetrate more comprehensively to all areas of the bathroom and effectively reducing dead air supply corners.

[0048] In practical applications, adjustments can be made according to scenario requirements to achieve an airflow effect of inner diffusion and outer convergence: Along the axial direction of the housing 10, the first guide plate 22 extends outward in a counterclockwise direction from the side where the first air duct 11 is located. This counterclockwise tilting setting can apply a radially outward guiding force to the airflow entering the inner air outlet ring 19, causing the inner airflow to diffuse radially outward during discharge; Along the axial direction of the housing 10, the second guide plate 23 extends outward in a clockwise direction from the side where the first air duct 11 is located. This clockwise tilting setting can apply a radially inward guiding force to the airflow entering the outer air outlet ring 20, causing the outer airflow to converge toward the center of the first air outlet 13 during discharge. The diffused airflow of the inner air outlet ring 19 and the outer air outlet ring 20... The gathered airflow forms a double-layer three-dimensional rotating air supply mode with the inner ring rotating counterclockwise to diffuse and the outer ring rotating clockwise to gather. This mode avoids energy loss caused by the outer airflow spreading too far, and improves the airflow uniformity between the central and edge areas, so that the airflow can penetrate more evenly to all corners of the bathroom. It also achieves the effect of reducing dead air supply corners and improving the overall ventilation comfort.

[0049] In this embodiment, the housing 10 adopts an integral structure or a split structure. Taking the split structure as an example, it includes a base 24 and an air guide plate 25. The air guide plate 25 and the base 24 are fixedly assembled by detachable methods such as bolt connection and snap-fit ​​connection. The inner wall of the air guide plate 25 facing the base 24 forms the first sidewall 14 of the first air duct 11. An air inlet 12 is provided in the central area. A radially extending plane 17 is provided around the air inlet 12. A second arc surface 18 is provided near the edge of the air guide plate 25. The inner wall of the base 24 facing the air guide plate 25 is spaced apart from the first sidewall and forms the second sidewall 15 of the first air duct 11. A first arc surface 16 is provided around the central area. A second arc surface 18 is provided near the edge. In addition, the base 24 also integrates a lamp holder function. A groove 26 is provided in the side facing away from the second sidewall 15 for installing a lighting lamp or a heating lamp, realizing the multi-functional integration of air supply, noise reduction, and lighting / heating.

[0050] Based on this, see Figures 8-12 This embodiment also proposes a bathroom heater, including a main unit 28, a fan 29, and the aforementioned noise reduction air outlet device. The main unit 28 serves as the mounting and functional support base for the bathroom heater, and its interior has a second air duct 30 extending along its length. The fan 29 is detachably mounted on the main unit 28 by means of bolts or snap-fit ​​connections and is located at the air inlet end of the second air duct 30. The side wall of the second air duct 30 of the main unit 28 has an installation port 31. The housing 10 is fixedly mounted at the installation port 31 by bolts or snap-fit ​​connections, and the air inlet 12 of the housing 10 is connected to the interior of the second air duct 30 to form an airflow channel.

[0051] The second air duct 30 is also provided with a second air outlet 32, which is located at the end of the main unit 28 away from the fan 29 and is open to the outside. The bathroom heater also includes a guide plate 33 and a drive component 34. The guide plate 33 is an arc-shaped or flat plate structure. The guide plate 33 is located between the mounting port 31 and the second air outlet 32, and its width is adapted to the width of the second air duct 30. One side of the guide plate 33 is rotatably connected to the inner wall of the second air duct 30, allowing the guide plate 33 to rotate around a pivot within a preset angle range. The driving component 34 is connected to the air guide plate 33 and drives it to rotate so that the air inlet end of the second air duct 30 is connected to the air inlet 12 or the second air outlet 32. That is, when the air guide plate 33 rotates to close the air inlet 12, the air inlet end of the second air duct 30 is connected to the second air outlet 32. When the air guide plate 33 rotates to open the air inlet 12 and blocks the connection between the air inlet end of the second air duct 30 and the second air outlet 32, the air inlet end of the second air duct 30 is connected to the first air outlet 13.

[0052] Furthermore, the mounting port 31 of the main unit 28 is provided with an air guide seat 35 and a heating element 36. The shape of the air guide seat 35 is adapted to the contour of the air inlet 12, and it is provided with a mounting groove 37 and several air guide holes 38. The air guide holes 38 extend axially along the housing 10 and communicate with the first air duct 11. The several air guide holes 38 are evenly distributed on the side of the air guide seat 35 opposite to the first air duct 11, which can cut the airflow into a uniform and regular airflow bundle and smoothly guide it into the first air duct 11, so that the airflow receives the guiding effect of the first arc surface 16 in an orderly state. The mounting groove 37 is located at the air inlet end of the air guide hole 38 and communicates with the air guide hole 38. The heating element 36 is embedded in the mounting groove 37, and there is a gap between the outer periphery of the heating element 36 and the inner wall of the mounting groove 37. By setting the heating element 36, it is ensured that the airflow is uniformly preheated before entering the air guide hole 38 and the first air duct 11.

[0053] The cross-sectional area of ​​the air inlet 12 is smaller than that of the air inlet end of the second air duct 30; the cross-sectional area of ​​the first air outlet 13 is smaller than that of the air inlet 12. Cross-sectional area refers to the area perpendicular to the airflow direction. This forms a stepped, decreasing cross-sectional area structure between the air inlet end of the second air duct 30, the air inlet 12, and the first air outlet 13. This structure, through two stages of cross-sectional contraction and pressurization, sequentially increases the airflow energy and wind pressure, effectively enhancing the airflow penetration, allowing the airflow to reach further areas of the bathroom. Furthermore, the pressurization process complements the three-dimensional airflow pattern of central convergence and peripheral diffusion, ensuring uniform airflow even over long distances and meeting the full coverage requirements of the bathroom.

[0054] The bathroom heater in this embodiment can realize both blowing and ventilation functions:

[0055] Blowing function: After the fan 29 starts, the drive unit 34 drives the air guide plate 33 to rotate to the position of blocking the second air outlet 32, so that the airflow in the second air duct 30 is completely guided into the air inlet 12 of the noise reduction air outlet device (at this time, the first air outlet 13 remains open). The airflow is cut into a uniform airflow bundle by the air guide hole 38 of the air guide seat 35, and the heating element 36 is turned on simultaneously to realize the output of warm air. Then the airflow enters the first air duct 11, and after being reflected and reduced by the first arc surface 16 and guided and pressurized by the second arc surface 18, it forms a double-layer three-dimensional rotating airflow with inner ring gathering and outer ring diffusion through the guide plates of the inner and outer rings, and finally discharged from the first air outlet 13, realizing a low-noise, uniform, and full-coverage air supply effect, suitable for bathroom heating needs. See Figure 9 .

[0056] Ventilation function: After the fan 29 starts, the drive unit 34 drives the air guide plate 33 to rotate to the position of blocking the air inlet 12 of the noise reduction air outlet device (at this time, the first air outlet 13 stops airflow), so that the airflow in the second air duct 30 cannot enter the noise reduction air outlet device, but instead flows directly along the second air duct 30 to the second air outlet 32 ​​and is quickly discharged. It is suitable for scenarios of rapid dehumidification and ventilation in bathrooms, meeting the needs of efficient ventilation. See [link / reference] Figure 11 .

[0057] In this invention, the terms "first," "second," and "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. The use of terms such as "upper," "lower," "left," "right," "front," and "rear" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings and is only for the convenience of describing the invention, not to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the scope of protection of this invention. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0058] Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0059] The above are merely specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept shall be considered as infringing upon the protection scope of the present invention.

Claims

1. A noise reduction air outlet device, comprising a housing, wherein the housing has a first sidewall and a second sidewall spaced apart, a first air duct is formed between the first sidewall and the second sidewall, the first air duct has a first air outlet, and the first sidewall has an air inlet communicating with the first air duct; characterized in that: The second sidewall has a reflective structure that extends along the airflow direction of the first air duct and is recessed inward away from the first sidewall. Part of the airflow entering through the air inlet is guided and reflected to the first sidewall by the reflective structure, and is repeatedly reflected between the first sidewall and the second sidewall. Noise reduction is achieved through sound energy superposition and attenuation, and finally discharged from the first air outlet.

2. The noise reduction air outlet device as described in claim 1, characterized in that, The reflective structure includes at least one first arc surface, which is circumferentially arranged around the central axis of the air inlet, and the first arc surface is concave inward in the direction away from the first sidewall.

3. The noise reduction air outlet device as described in claim 1, characterized in that, The curvature of the first arc surface gradually decreases along the airflow direction of the first air duct; the area of ​​the outer periphery of the air inlet of the first sidewall opposite to the first arc surface is set as a plane, and the plane extends radially along the shell.

4. The noise reduction air outlet device as described in claim 1, characterized in that, The first air outlet extends circumferentially along the housing; it also includes an air guide ring, which is installed on the first air outlet to divide the first air outlet into an inner air outlet ring and an outer air outlet ring in the radial direction of the housing.

5. The noise reduction air outlet device as described in claim 4, characterized in that, The inner air outlet ring is provided with a plurality of first guide plates spaced apart along the circumference of the housing, and the outer air outlet ring is provided with a plurality of second guide plates spaced apart along the circumference of the housing; along the axial direction of the housing, the first guide plates and the second guide plates are inclined in opposite directions, one of them extending outward in a clockwise direction from the side where the first air duct is located, and the other extending outward in a counterclockwise direction from the side where the first air duct is located.

6. The noise reduction air outlet device as described in claim 1, characterized in that, The first sidewall and the second sidewall are provided with a second arc surface in the area near the first air outlet, and the second arc surface extends circumferentially along the housing; the second arc surface on the first sidewall is concave inward in the direction away from the second sidewall.

7. The noise reduction air outlet device as described in claim 1, characterized in that, The first sidewall and the second sidewall are provided with a second arc surface in the area near the first air outlet, and the second arc surface extends circumferentially along the housing; the second arc surface on the second sidewall protrudes outward toward the direction near the first sidewall.

8. The noise reduction air outlet device as described in claim 1, characterized in that, The housing includes a detachable fixed connection base and an air guide plate; the inner wall of the air guide plate facing the base constitutes the first side wall of the first air duct; the inner wall of the base facing the air guide plate is spaced apart from the first side wall, correspondingly constituting the second side wall of the first air duct.

9. A bathroom heater, comprising a main unit and a fan, wherein the main unit has a second air duct extending along its length, the fan is mounted on the main unit and located at the air inlet end of the second air duct, and the main unit has an installation port; characterized in that, It also includes a noise reduction air outlet device according to any one of claims 1 to 8, wherein the noise reduction air outlet device is installed at the mounting port, and the air inlet is connected to the second air duct so that the airflow flows from the second air duct to the first air duct.

10. A bathroom heater as described in claim 9, characterized in that, The cross-sectional area of ​​the air inlet is smaller than the cross-sectional area of ​​the air inlet end of the second air duct; the cross-sectional area of ​​the first air outlet is smaller than the cross-sectional area of ​​the air inlet.

11. A bathroom heater as described in claim 9, characterized in that, The main unit is provided with an air guide seat and a heating element at the mounting port; the air guide seat is provided with a mounting groove and several air guide holes, the air guide holes extend along the axial direction of the housing and communicate with the first air duct, the mounting groove is located at the air inlet end of the air guide hole and communicates with the air guide hole; the heating element is installed in the mounting groove.

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