Silent bladeless fan

Abstract

A supporting ring seat is arranged in a barrel of the silent bladeless fan, a sponge mat is placed in a step groove in the upper end of the ring seat, a protruding ring on the outer wall of a fan motor assembly shell is placed in the step groove, the sponge mat is clamped between the protruding ring and the step groove, and the shell is clamped into the inner wall of the sponge mat. The sponge cushion absorbs vibration of the motor through elastic buffering, vibration is prevented from being transmitted to the ring seat and the cylinder through rigid connection, and compared with traditional screw fixing, vibration is blocked from the source, and resonance noise is reduced. Gaps are reserved between the shell and the ring base and the cylinder, a vibration transmission path is cut off, and extra noise generated by collision friction is avoided. The silencing cover body at the lower end of the supporting ring seat wraps the motor air inlet to limit noise diffusion; the noise reduction structure comprises an outer air inlet, an inner air inlet and a communicated noise reduction channel, noise transmission needs to pass through the channel, energy is consumed through multiple times of reflection and refraction, noise reduction is achieved, user experience is improved, and the scene requirements of families, offices and the like are met.

Description

Technical Field

[0001] This invention relates to the field of bladeless fan technology, and particularly to a silent bladeless fan. Background Technology

[0002] In the current field of bladeless fan technology, noise remains a key pain point affecting user experience, primarily stemming from two core structural defects. Firstly, traditional bladeless fans often use screws to directly fix the fan motor assembly housing to the cylinder, a rigid connection lacking an effective vibration damping structure. When the motor operates, the vibrations it generates are transmitted directly to the housing and cylinder without obstruction, causing component resonance and producing noticeable noise. This noise problem is particularly pronounced when the motor is running at high speeds, severely disrupting the user's daily environment.

[0003] On the other hand, bladeless fans require air to be drawn in through an air intake to create airflow. The motor itself generates noise, and traditional designs often feature open air intakes without dedicated noise-blocking structures. This allows the noise generated by the motor to diffuse directly outwards through the intake, further exacerbating overall noise pollution. For example, in noise-sensitive environments such as nighttime rest, fan noise can severely impact sleep quality and significantly reduce user satisfaction. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the problems existing in the prior art. To this end, the present invention proposes a silent bladeless fan.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A silent bladeless fan includes a fan base and a fan motor assembly disposed within the fan base. The fan base includes a cylindrical body with an airflow outlet at its upper end and an air inlet on one side. A support ring seat is disposed within the cylindrical body, and a stepped groove is provided at the upper end of the support ring seat. A sponge pad is disposed within the stepped groove. The fan motor assembly includes a housing, and a protruding ring is provided on the outer wall of the housing, which is placed within the stepped groove. The sponge pad is located between the stepped groove and the protruding ring, and the housing is secured. The inner wall of the sponge pad has a gap between its outer shell and the support ring seat and the cylinder. A sound-absorbing cover is also provided at the lower end of the support ring seat. The air inlet of the fan motor assembly is located in the sound-absorbing cover. The side wall of the sound-absorbing cover is provided with a sound-absorbing structure. The outer wall of the sound-absorbing cover is an outer annular side wall and the inner wall is an inner annular side wall. The sound-absorbing structure includes an outer air inlet provided on the outer annular side wall, an inner air inlet provided on the inner annular side wall, and a sound-absorbing channel connecting the outer air inlet and the inner air inlet.

[0006] Furthermore, a plurality of elastic components are evenly distributed along the circumference of the convex ring. Each elastic component includes a movable rod that passes through the convex ring from top to bottom. A limit ring is provided at the lower end of the movable rod. A spring is sleeved on the movable rod. The upper end of the spring abuts against the convex ring, and the lower end abuts against the limit ring. An elastic limit hook is provided at the upper end of the movable rod.

[0007] Furthermore, the sponge pad is provided with a clearance hole corresponding to the position of the movable rod, and the limiting ring is disposed in the clearance hole.

[0008] Furthermore, the convex ring includes a plurality of protrusions evenly distributed along the circumference, and the stepped groove is provided with corresponding slots for placing the protrusions.

[0009] Furthermore, each of the elastic components is correspondingly disposed on the protrusion.

[0010] Furthermore, the fan motor assembly also includes an inner shell disposed within the outer shell, the outer shell being vertically continuous and an air duct being formed between the outer shell and the inner shell, the inner shell being provided with a motor, and the motor output shaft being provided with a fan impeller.

[0011] Furthermore, the soundproof cover has a barrel-shaped structure with an open top, including a circular bottom plate, an outer annular side wall and an inner annular side wall disposed on the circular bottom plate, the outer air inlet is disposed on the outer annular side wall, the inner air inlet is disposed on the inner annular side wall, and the soundproofing channel is disposed between the outer annular side wall and the inner annular side wall.

[0012] Furthermore, the straight line segment from the center of the circular base plate to the outer air inlet is the first reference line, and the straight line segment from the center of the circular base plate to the inner air inlet is the second reference line. An angle A is formed between the first reference line and the second reference line, and the angle A is 25-35°.

[0013] Furthermore, the noise-absorbing channel has an arc-shaped structure or an S-shaped structure.

[0014] Furthermore, a straight duct is connected to the airflow outlet, and a bend in the duct is connected to the other end of the straight duct. A branch pipe is connected to one end of the bend in the duct, and air outlet pipes are connected to both the left and right ends of the branch pipe.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. A support ring seat is installed inside the cylinder. A sponge pad is placed in the stepped groove at the upper end of the support ring seat. The convex ring on the outer wall of the fan motor assembly housing is placed in the stepped groove, and the sponge pad is sandwiched between the stepped groove and the convex ring. At the same time, the housing is secured to the inner wall of the sponge pad. The sponge pad has excellent elasticity and cushioning performance, which can directly absorb the vibration energy generated during motor operation, preventing vibration from being transmitted to the support ring seat and the cylinder through a rigid connection. Compared with the traditional rigid connection fixed by screws, this structure blocks the vibration transmission at the source, significantly reducing resonance noise caused by vibration. At the same time, the sponge pad also plays a sealing role, ensuring that air pressure does not leak, ensuring that the airflow inside the cylinder can blow upwards better, resulting in better air pressure and farther reach.

[0016] 2. A gap is reserved between the outer casing and the support ring seat and cylinder to prevent the motor assembly casing from directly contacting other rigid components. This design further cuts off the vibration transmission path and prevents additional noise caused by collisions or friction between the outer casing and the cylinder and support ring seat, significantly improving the quietness of the fan operation.

[0017] 3. In addition, compared with the rigid connection that relies on multiple screws to tighten one by one in the existing technology, this structure only requires aligning the convex ring of the motor housing with the stepped groove of the support ring seat during assembly, so that the convex ring is inserted into the inner wall of the sponge pad, and then the motor assembly itself is used to press down naturally to complete the stable installation of the motor. This greatly shortens the assembly time of a single product, reduces the difficulty of manual operation, and is especially suitable for mass production scenarios on assembly lines, effectively improving the overall production efficiency.

[0018] 4. The soundproof cover set at the lower end of the support ring completely encloses the air inlet of the fan motor assembly, so that the noise generated by the motor operation is confined inside the soundproof cover, preventing the noise from spreading directly outward from the motor air inlet, and effectively intercepting it from the starting point of the noise propagation path.

[0019] 5. The noise reduction structure consists of an external air inlet, an internal air inlet, and a noise reduction channel connecting the two. When noise generated by the fan motor assembly propagates outwards, it must pass through the noise reduction channel. During this process, the noise is continuously reflected and refracted within the channel, and its energy is gradually dissipated, thus reducing noise and significantly improving the user experience. This meets the needs of various scenarios such as homes and offices for quiet bladeless fans. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the bladeless fan of the present invention.

[0021] Figure 2 This is a schematic diagram of the fan base of the present invention.

[0022] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0023] Figure 4 For the present invention Figure 3 A magnified structural diagram at point A.

[0024] Figure 5 This is a schematic diagram of the fan motor assembly and support ring seat of the present invention.

[0025] Figure 6 This is a schematic diagram of the structure of the elastic component of the present invention after installation.

[0026] Figure 7 This is a cross-sectional view of the fan motor assembly and the soundproof cover of the present invention after installation.

[0027] Figure 8 This is a three-dimensional schematic diagram of the sound-absorbing cover of the present invention.

[0028] Figure 9 This is a front view schematic diagram of the sound-absorbing cover of the present invention.

[0029] Figure 10 For the present invention Figure 9 Schematic diagram of section AA. Detailed Implementation

[0030] The following detailed description provides various embodiments or examples for carrying out the present invention. Of course, these are merely embodiments or examples and are not intended to be limiting. Additionally, repeated reference numerals, such as repeated numbers and / or letters, may be used in different embodiments. These repetitions are for the purpose of simple and clear description of the invention and do not represent a specific relationship between the different embodiments and / or structures discussed.

[0031] like Figures 1-10 The illustrated silent bladeless fan includes a fan base 1 and a fan motor assembly disposed within the fan base 1. The fan base 1 includes a cylindrical body 3, with an airflow outlet 4 at the upper end and an air inlet 5 on one side. A support ring seat 6 is disposed within the cylindrical body 3, and a stepped groove 7 is provided at the upper end of the support ring seat 6. A sponge pad 8 is disposed within the stepped groove 7. The fan motor assembly includes a housing 9, with a protruding ring 10 disposed on the outer wall of the housing 9 and placed within the stepped groove 7. The sponge pad 8 is located between the stepped groove 7 and the protruding ring 10, and the housing 9 is engaged with the inner wall of the sponge pad 8, creating a gap between the housing 9 and the support ring seat 6 and the cylindrical body 3.

[0032] Based on the above structure, a sponge pad 8 (preferably high-density elastic sponge, which balances vibration reduction and support) is set between the stepped groove 7 of the support ring seat 6 and the convex ring 10 of the fan motor assembly housing 9. The elastic buffering characteristics of the sponge pad 8 are used to construct a "flexible barrier layer" for motor vibration. The vibration generated when the motor is working will be absorbed and attenuated by the sponge pad 8 first, instead of being directly transmitted to the support ring seat 6 and the cylinder 3. The efficient transmission path of vibration to the cylinder 3 is cut off from the source, which greatly reduces the structural noise generated by the vibration of the cylinder 3. This makes the bladeless fan quieter when running, especially suitable for noise-sensitive scenarios such as bedrooms and studies, and significantly improves the user's comfort.

[0033] In addition, the gap between the outer shell 9 and the support ring seat 6 and the cylinder 3 provides space for the deformation of the sponge pad 8 and prevents the components from being worn or making abnormal noises due to vibration and compression.

[0034] Since the weight of the fan motor assembly continuously acts on the sponge pad 8, long-term use can easily lead to permanent deformation of the sponge pad due to fatigue, resulting in a decrease in cushioning performance. Therefore, several elastic components are evenly distributed along the circumference of the convex ring 10. These components can support the convex ring 10 upwards through their own elastic force, distributing the pressure of the fan motor assembly's weight on the sponge pad. The pre-elastic force of the elastic components balances the weight of the fan motor assembly, reducing the long-term compression of the sponge pad and preventing it from losing elasticity due to excessive pressure, thus maintaining its long-term cushioning performance.

[0035] Furthermore, a soundproof cover 11 is provided at the lower end of the support ring seat 6. The air inlet of the fan motor assembly is located inside the soundproof cover 11. The side wall of the soundproof cover 11 is provided with a soundproofing structure. The outer wall of the soundproof cover 11 is an outer annular side wall 12 and the inner wall is an inner annular side wall 13. The soundproofing structure includes an outer air inlet 14 provided on the outer annular side wall 12, an inner air inlet 15 provided on the inner annular side wall 13, and a soundproofing channel 16 connecting the outer air inlet 14 and the inner air inlet 15.

[0036] Thus, the silencing cover 11 set at the lower end of the support ring 6 completely encloses the air inlet of the fan motor assembly, so that the noise generated by the motor operation is confined inside the silencing cover 11, preventing the noise from spreading directly outward from the motor air inlet, and effectively intercepting it from the starting point of the noise propagation path.

[0037] Specifically, the noise reduction structure consists of an external air inlet 14, an internal air inlet 15, and a noise reduction channel 16 connecting the two. When noise generated by the fan motor assembly propagates outwards, it must pass through the noise reduction channel 16. During this process, the noise is continuously reflected and refracted within the noise reduction channel 16, and its energy is gradually consumed, thus reducing noise and significantly improving the user experience. This meets the needs of various scenarios such as homes and offices for quiet bladeless fans.

[0038] See Figures 4-6 As shown, a plurality of elastic components are evenly distributed along the circumference of the convex ring 10. Each elastic component includes a movable rod 31 that passes through the convex ring 10 vertically. A limiting ring 32 is provided at the lower end of the movable rod 31. A spring 33 is sleeved on the movable rod 31. The upper end of the spring 33 abuts against the convex ring 10, and the lower end abuts against the limiting ring 32. An elastic limiting hook 41 is provided at the upper end of the movable rod 31.

[0039] The movable rod 31 is threaded through the upper and lower convex rings 10, providing a stable guide for the extension and contraction of the spring 33. This ensures that the spring 33 always functions as a buffer in the vertical direction. Simultaneously, the diameter of the limiting ring 32 at the lower end of the movable rod 31 is larger than the diameter of the movable rod 31 and also larger than the aperture on the convex ring 10 through which the movable rod passes. This effectively limits the upward travel of the movable rod 31, preventing it from slipping off the convex ring 10 and ensuring the integrity of the overall elastic component structure. Furthermore, the limiting ring 32 provides a stable lower support point for the spring 33, ensuring that the elastic force of the spring 33 is always evenly applied to the convex ring 10, avoiding uneven force distribution caused by the lower end of the spring 33 being suspended. The elastic limit hook 41 and the movable rod 31 are made of plastic material as a whole. Its free end is bent downward. During assembly, when the movable rod 31 is passed through the through hole of the convex ring 10 from bottom to top, the elastic limit hook 41 is squeezed inward and retracted. After the elastic limit hook 41 passes the convex ring 10, it returns outward. Thus, the elastic limit hook 41 and the limit ring 32 form a bidirectional limit, ensuring that the movable rod 31 always moves within the preset range and preventing the elastic component from failing due to the movable rod dislodging.

[0040] The sponge pad 8 is provided with a clearance hole 51 corresponding to the position of the movable rod 31, and the limiting ring 32 is provided in the clearance hole 51.

[0041] Specifically, the clearance hole 51 on the sponge pad 8 penetrates the upper and lower surfaces of the sponge pad, and its diameter is slightly larger than that of the limiting ring 32. The axis of the clearance hole 51 is completely aligned with the axis of the movable rod 31. During assembly, the limiting ring 32 at the lower end of the movable rod 31 passes through the clearance hole 51 and is directly supported at the bottom of the stepped groove 7 of the support ring seat 6. This prevents the sponge pad 8 from blocking the contact between the limiting ring 32 and the support ring seat 6, and also provides a stable vertical support space for the movable rod 31. This ensures that the elastic component can continuously and evenly apply an upward supporting force to the fan motor assembly, counteracting the motor's own weight and preventing the motor from sinking or tilting due to unstable support.

[0042] See Figure 5 As shown, the convex ring 10 includes a plurality of protrusions 61 evenly distributed along the circumference, and the stepped groove 7 is provided with a corresponding slot 62 for placing the protrusions 61, and each of the elastic components is correspondingly provided on the protrusions 61.

[0043] Four protrusions 61 are evenly arranged along the circumference (the number of protrusions is the same as the number of elastic components). Each protrusion 61 is a fan-shaped structure with equal spacing. In the stepped groove (7) of the support ring seat 6, a fan-shaped slot 62 is machined corresponding to the position of each protrusion 61. The size of the slot 62 matches that of the protrusion 61. However, when the protrusion 61 is embedded in the slot 62, the two do not contact each other and have a small gap.

[0044] In this invention, the fan motor assembly further includes an inner shell 81 disposed within the outer shell 9. The outer shell 9 is vertically continuous, and an air duct 84 is formed between the outer shell 9 and the inner shell 81. The inner shell 81 is provided with a motor 82, and an impeller 83 is provided on the output shaft of the motor 82.

[0045] Motor 82 drives impeller 83 to rotate at high speed, generating negative pressure to attract external air from air inlet 5 into cylinder 3. After the air enters air duct 84, due to the centrifugal force of the air duct's annular structure and the impeller, the airflow accelerates upward along the air duct and is finally ejected from air outlet 4, forming a stable airflow stream. Of course, this fan motor assembly is a conventional design and will not be described in detail here.

[0046] See Figures 7-10 As shown, the silencing cover 11 has a barrel-shaped structure with an open top, including a circular bottom plate 17, an outer annular sidewall 12 and an inner annular sidewall 13 disposed on the circular bottom plate 17, an outer air inlet 14 disposed on the outer annular sidewall 12, an inner air inlet 15 disposed on the inner annular sidewall 13, and a silencing channel 16 disposed between the outer annular sidewall 12 and the inner annular sidewall 13.

[0047] When the fan is working, the motor drives the impeller to rotate and generate negative pressure. Under the action of negative pressure, the outside air enters from the outer air inlet 14 of the outer annular sidewall 12, passes through the silencer channel 16, and then enters from the inner air inlet 15.

[0048] During the process, the noise generated by the motor is confined inside the silencing cover 11. The noise continuously collides and reflects with the side wall within the space of the silencing channel 16, and the energy is gradually consumed.

[0049] The preferred solution for the silencing channel 16 in this application is an arc-shaped or S-shaped structure. Of course, the silencing channel can also adopt any other shape structure. As long as any technical means that are the same as or similar to this solution are used to achieve the technical effect of this invention, they should fall within the protection scope of this invention.

[0050] See Figure 10As shown, the straight line segment from the center of the circular base plate 17 to the outer air inlet 14 is the first reference line 111, and the straight line segment from the center of the circular base plate 17 to the inner air inlet 15 is the second reference line 222. An angle A is formed between the first reference line 111 and the second reference line 222, and the angle A is 25-35°, preferably 30°. This allows for a certain distance between the outer air inlet 14 and the inner air inlet 15, thereby extending the length of the silencing channel 16 to achieve a better noise reduction effect.

[0051] Specifically, when the motor generates noise, due to the 25-35° angle A between the first reference line 111 and the second reference line 222, the noise cannot be transmitted directly from the inner air inlet 15 to the outer air inlet 14 in a straight line. It needs to change direction within the silencing channel 16 and flow along a path adapted to the angle A. During this process, the noise generated by the motor will be reflected and refracted more times by the sidewall of the silencing channel 16, and each reflection will consume some noise energy. At the same time, the non-linear flow path prolongs the residence time of the noise within the silencing channel 16, allowing the noise energy to be consumed more fully. Ultimately, only the significantly weakened noise flows out with the air from the inner air inlet 15, effectively reducing the noise propagation intensity.

[0052] The external air inlet 14, the internal air inlet 15, and the silencing channel 16 are arranged in multiple sets along the circumference, and the design of this application has twenty sets, the number of which can be selected according to the size and strength of the silencing cover 11.

[0053] See Figure 1 As shown, a straight duct 100 is connected to the airflow outlet 4, and a duct bend 101 is connected to the other end of the straight duct 100. A diversion pipe 102 is connected to one end of the duct bend 101, and air outlet pipes 103 are connected to both the left and right ends of the diversion pipe 102.

[0054] The airflow generated by the fan motor assembly is discharged from the airflow outlet 4 at the upper end of the cylinder 3, first entering the straight duct 100. Due to the smooth inner wall and uniform diameter of the straight duct, the airflow flows stably in a straight line, reducing turbulence. The airflow then enters the bend duct 101. The 90° bend angle and reasonable bend radius allow the airflow to change direction smoothly, avoiding eddies or wind resistance caused by sharp turns. After entering the splitter duct 102, the internal guide plate guides the airflow to be evenly divided into two parts, flowing into the branch ducts on both sides respectively, and then into the outlet duct 103, finally being discharged from the outlet of the outlet duct 103.

[0055] Based on the accompanying drawings and the foregoing illustrations and descriptions, the basic principles and main features of the present invention, as well as its advantages, those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A silent bladeless fan, comprising a fan base (1) and a fan motor assembly disposed within the fan base (1), wherein the fan base (1) comprises a cylindrical body (3), the upper end of the cylindrical body (3) is provided with an airflow outlet (4), and one side is provided with an air inlet (5), characterized in that: A support ring seat (6) is provided inside the cylinder (3). A stepped groove (7) is provided at the upper end of the support ring seat (6). A sponge pad (8) is provided inside the stepped groove (7). The fan motor assembly includes a housing (9). A protruding ring (10) is provided on the outer wall of the housing (9) and placed in the stepped groove (7). The sponge pad (8) is located between the stepped groove (7) and the protruding ring (10), and the housing (9) is engaged with the inner wall of the sponge pad (8), so that there is a gap between the housing (9) and the support ring seat (6) and the cylinder (3). The lower end of the seat (6) is also provided with a soundproof cover (11). The air inlet of the fan motor assembly is located inside the soundproof cover (11). The side wall of the soundproof cover (11) is provided with a soundproofing structure. The outer wall of the soundproof cover (11) is an outer annular side wall (12) and the inner wall is an inner annular side wall (13). The soundproofing structure includes an outer air inlet (14) provided on the outer annular side wall (12), an inner air inlet (15) provided on the inner annular side wall (13), and a soundproofing channel (16) connecting the outer air inlet (14) and the inner air inlet (15).

2. The silent bladeless fan according to claim 1, characterized in that: A plurality of elastic components are evenly distributed along the circumference of the convex ring (10). Each elastic component includes a movable rod (31) that passes through the convex ring (10) from top to bottom. A limit ring (32) is provided at the lower end of the movable rod (31). A spring (33) is sleeved on the movable rod (31). The upper end of the spring (33) abuts against the convex ring (10), and the lower end abuts against the limit ring (32). An elastic limit hook (41) is provided at the upper end of the movable rod (31).

3. A silent bladeless fan according to claim 2, characterized in that: The sponge pad (8) is provided with a clearance hole (51) corresponding to the position of the movable rod (31), and the limiting ring (32) is provided in the clearance hole (51).

4. A silent bladeless fan according to claim 2, characterized in that: The convex ring (10) includes a plurality of protrusions (61) evenly distributed along the circumference, and the stepped groove (7) is provided with a corresponding slot (62) for placing the protrusions (61).

5. A silent bladeless fan according to claim 4, characterized in that: Each of the elastic components is correspondingly disposed on the protrusion (61).

6. A silent bladeless fan according to claim 1, characterized in that: The fan motor assembly also includes an inner shell (81) disposed inside the outer shell (9). The outer shell (9) is vertically connected, and an air duct (84) is formed between the outer shell (9) and the inner shell (81). The inner shell (81) is provided with a motor (82), and an impeller (83) is provided on the output shaft of the motor (82).

7. A silent bladeless fan according to claim 1, characterized in that: The silencing cover (11) has a barrel-shaped structure with an open top, including a round bottom plate (17), an outer annular sidewall (12) and an inner annular sidewall (13) on the round bottom plate (17), an outer air inlet (14) on the outer annular sidewall (12), an inner air inlet (15) on the inner annular sidewall (13), and a silencing channel (16) between the outer annular sidewall (12) and the inner annular sidewall (13).

8. A silent bladeless fan according to claim 7, characterized in that: The straight line segment between the center of the circular base plate (17) and the outer air inlet (14) is the first reference line (111), and the straight line segment between the center of the circular base plate (17) and the inner air inlet (15) is the second reference line (222). An angle A is formed between the first reference line (111) and the second reference line (222), and the angle A is 25-35°.

9. A silent bladeless fan according to claim 8, characterized in that: The noise reduction channel (16) has an arc-shaped structure or an S-shaped structure.

10. A silent bladeless fan according to claim 1, characterized in that: A straight duct (100) is connected to the air outlet (4), and the other end of the straight duct (100) is connected to a duct bend (101). One end of the duct bend (101) is connected to a diversion pipe (102), and both the left and right ends of the diversion pipe (102) are connected to an air outlet pipe (103).

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