Silent energy-saving fan

Abstract

The invention relates to the technical field of axial flow ventilation fans, in particular to a mute energy-saving fan. Comprising a shell and filter screens at two ports of the shell; a motor is fixedly connected into the machine shell. The output end of the motor is fixedly connected with an output shaft; the outer wall of the output shaft is connected with a ring-sleeve-shaped folding shell; inclined folding grooves are evenly formed in the folding shell around the center. A blade groove is formed in the folding groove in an outward penetrating mode. The blade grooves penetrate through and are movably connected with fan blades; the fan blades are made of flexible materials; the folding groove is rotationally connected with a folding rod in the axial direction; the fan blades are pulled by the counterweight strips under the action of centrifugal force, and the folding rods are rotationally folded by the coil springs, so that the specifications of the fan blades on the outer side of the folding shell are changed along with the change of the rotating speed of the motor, and the wind resistance is reduced as much as possible to realize noise reduction and energy conservation while the air volume is ensured.

Description

Technical Field

[0001] This invention relates to the field of axial flow ventilation fan technology, specifically a quiet and energy-saving fan. Background Technology

[0002] Axial flow fans are widely used in ventilation and air exchange applications in many fields, including industrial production and civil construction, due to their advantages such as large air volume and simple structure. However, the blade structure of traditional axial flow fans currently has certain limitations.

[0003] Most existing axial flow fans use a fixed blade design, and the blade size and shape cannot be changed after manufacturing. When the fan is running at low speed to meet a small air volume requirement, the fixed blades still have a fixed, large contact area with the air, generating significant air resistance. This causes the fan to have to overcome a larger load, which not only makes the motor consume more energy but also increases the wear and tear on the equipment, reduces the overall efficiency of the fan, and makes it difficult to achieve good energy-saving effects.

[0004] While fixed blades can provide a certain airflow during high-speed operation, the blades cannot adaptively adjust to the required speed and airflow, potentially leading to suboptimal matching between the blades and the high-speed airflow. This causes turbulence and eddies around the blades, increasing energy loss, reducing the fan's aerodynamic efficiency, and generating significant noise, impacting the working environment and people's quality of life.

[0005] Furthermore, in practical applications, the airflow requirements of axial flow fans vary dynamically depending on different environments and operating conditions. For example, in some industrial production processes, the ventilation requirements differ greatly at different production stages; in civil buildings, the indoor ventilation requirements also vary depending on the season and time of day. Fixed-blade axial flow fans cannot adjust their blade configuration in a timely manner to meet these complex and changing demands, resulting in inefficient operation in many situations, leading to energy waste and inefficient resource utilization. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies, this invention proposes a silent and energy-saving fan. This invention uses a counterweight bar to pull the fan blades under centrifugal force, and a coil spring to rotate and fold the stacking rod. This allows the specifications of the fan blades on the outside of the stacking shell to change with the speed of the motor, thereby ensuring airflow while minimizing wind resistance to achieve noise reduction and energy saving.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: A silent and energy-saving fan of the present invention includes a casing and filters at both ends of the casing; a motor is fixedly connected inside the casing; an output shaft is fixedly connected to the output end of the motor; a ring-shaped folding shell is connected to the outer wall of the output shaft; inclined folding grooves are evenly arranged around the center inside the folding shell; a blade groove is provided through the folding groove outward; a fan blade is movably connected through the blade groove; the fan blade is made of flexible material; a folding rod is rotatably connected to the folding groove along the axial direction; one end of the fan blade is fixedly connected to the outer wall of the folding rod, and the rear end of the fan blade is fixedly connected to a counterweight bar; a coil spring groove corresponding to the folding groove is provided inside the folding shell; one end of the folding rod extends into the coil spring groove and is twisted to the coil spring body.

[0008] Preferably, the cross-section of the blade groove is adapted to the cross-section of the fan blade; the counterweight bar is larger than the blade groove opening and can cover the blade groove opening; the counterweight bar is adapted to the outer wall of the stacking shell.

[0009] Preferably, the stacking shell has a square groove corresponding to the stacking slot inside; a square plate is slidably and sealingly connected inside the square groove; the other end of the stacking rod extends into the square groove and is threadedly and sealingly connected to the square plate; the stacking shell has an annular adjustment groove inside; an adjustment plate is movably and sealingly connected inside the adjustment groove; the adjustment groove has a threaded hole near the motor slot wall facing the motor; an adjustment bolt is threadedly connected inside the threaded hole; the square groove and the adjustment groove are connected at one end near each other through a first liquid hole.

[0010] Preferably, the adjustment slot is a single one; the ends of the plurality of square slots near the motor are connected to the ends of the single adjustment slot away from the motor through a first liquid hole.

[0011] Preferably, the fan blades are provided with a reinforcing groove inside; the two larger groove walls of the reinforcing groove are connected by multiple limiting blocks; the groove wall of the adjusting groove away from the square groove is connected to the inside of the reinforcing groove through a second liquid hole; the second liquid hole is provided inside the stacking rod and the stacking shell.

[0012] Preferably, the inner wall of the reinforcing groove is provided with flexible extension tubes at opposite corners; one end of the extension tube is open and the other end is connected to the second liquid hole.

[0013] Preferably, the outer wall of the output shaft is provided with a sliding groove; a slide bar is slidably connected in the sliding groove; the slide bar is fixedly connected to the inner wall of the stacking shell; a rotating ring is rotatably connected to one end of the stacking shell near the motor; the rotating ring is connected to the motor by a spring.

[0014] Preferably, the arc-shaped outer wall of the stacked shell is connected to a first bolt along a radial thread; the first bolt contacts the bottom of the chute.

[0015] Preferably, the square groove is connected to the corresponding stacking groove through the first air hole; the square groove is connected to the outer wall of the stacking shell through a one-way air inlet near the groove wall of the stacking groove, and a one-way air outlet is provided around the groove opening of the stacking groove and the blade groove.

[0016] The beneficial effects of this invention are as follows: 1. This invention uses a counterweight bar to pull the fan blades under centrifugal force, and a coil spring to rotate and fold the stacking rod. This allows the specifications of the fan blades on the outside of the stacking shell to change with the speed of the motor, thereby ensuring airflow while minimizing wind resistance to achieve noise reduction and energy saving.

[0017] 2. The present invention restricts the movement of the adjusting plate in the adjusting groove by adjusting the bolt rotating in the threaded hole, thereby limiting the maximum length of the fan blade extending out of the blade groove to meet the usage requirements of different scenarios.

[0018] 3. In this invention, during the unfolding process of the fan blades as the centrifugal force increases, the reinforcing groove inside the fan blades is filled with liquid medium, and during the folding process of the fan blades as the centrifugal force decreases, the liquid medium inside the reinforcing grooves of the fan blades is removed, thereby making the liquid medium inside the fan blades adapt to the length of the fan blades extending out of the blade grooves, thus ensuring the working effect of the fan blades. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a perspective view of the present invention; Figure 2 This is a diagram of the internal structure of the casing in this invention; Figure 3 yes Figure 2 Enlarged view of point A in the middle; Figure 4 This is a diagram showing the positions of the rotating ring and the spring in this invention; Figure 5 This is a plan view of the stacked shell and fan blades in this invention; Figure 6 yes Figure 5 Sectional view at point BB; Figure 7 yes Figure 6 Enlarged view of point C in the middle; Figure 8 This is a cross-sectional view of the fan blade in this invention.

[0021] In the diagram: 1. Housing 1, Filter 11, Motor 12, Output Shaft 2, Slide 21, Slide Bar 22, Stacking Shell 3, Stacking Groove 31, First Chamber 311, Second Chamber 312, One-way Air Outlet 313, Blade Groove 32, Spring Groove 33, Square Groove 34, First Air Hole 343, One-way Air Inlet 344, Square Plate 35, Adjustment Groove 36, Threaded Hole 361, Adjustment Bolt 362, First Liquid Hole 363, Second Liquid Hole 364, Third Chamber 365, Fourth Chamber 366, Adjustment Plate 37, Rotary Ring 38, Spring 381, First Bolt 39, Fan Blade 4, Counterweight Bar 41, Reinforcing Groove 42, Limiting Block 43, Extension Tube 44, Stacking Rod 5, Spring Body 51. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0023] like Figures 1 to 8 As shown, the present invention includes the following embodiments: Example 1: A silent and energy-saving fan includes a housing 1 and filters 11 at both ends of the housing 1; a motor 12 is fixedly connected inside the housing 1; an output shaft 2 is fixedly connected to the output end of the motor 12; a ring-shaped folding shell 3 is connected to the outer wall of the output shaft 2; an inclined folding groove 31 is evenly arranged around the center inside the folding shell 3; a blade groove 32 is provided through the folding groove 31 outwardly; a fan blade 4 is movably connected through the blade groove 32; the fan blade 4 is made of flexible material; a folding rod 5 is rotatably connected to the folding groove 31 along the axial direction; one end of the fan blade 4 is fixedly connected to the outer wall of the folding rod 5, and the rear end of the fan blade 4 is fixedly connected to a counterweight bar 41; a coil spring groove 33 corresponding to the folding groove 31 is provided inside the folding shell 3; one end of the folding rod 5 extends into the coil spring groove 33 and is twisted to a coil spring body 51.

[0024] In this embodiment, the inner cross section of the blade groove 32 is adapted to the cross section of the fan blade 4; the counterweight strip 41 is larger than the opening of the blade groove 32 and can cover the opening of the blade groove 32; the counterweight strip 41 is adapted to the outer wall of the stacking shell 3.

[0025] After installing the fan in the required location, powering on the fan and starting motor 12 will drive the output shaft 2 at the output end of motor 12 to rotate. During the rotation of output shaft 2, the folding shell 3 will rotate synchronously. The rotation of folding shell 3 will cause the internal folding groove 31 and the folding rod 5 within the folding groove 31 to rotate around output shaft 2. The rotation of folding shell 3 will also cause the fan blades 4 and counterweight 41 to rotate around the center of output shaft 2. The counterweight 41 will generate centrifugal force as motor 12 rotates, causing it to move away from output shaft 2 under the action of centrifugal force. As the counterweight bar 41 moves away from the output shaft 2, it pulls the fan blade 4 to move within the blade groove 32. The end of the fan blade 4 located within the take-up groove 31 is unwound from the take-up bar 5 as the counterweight bar 41 moves. This causes the outer end of the fan blade 4 to gradually extend from the opening of the blade groove 32. During the unwinding process of the take-up bar 5, the take-up bar 5 needs to overcome the rotation of the coil spring body 51. The faster the motor 12 rotates, the faster the output shaft 2 and the take-up shell 3 rotate, resulting in a larger fan blade 4 extending from the outer wall of the take-up shell 3, ensuring the motor 12... 2. At higher rotational speeds, the fan output efficiency is as follows: Motor 12 drives the output shaft 2 and the folding shell 3 to rotate, causing multiple fan blades 4 to rotate. This allows surrounding air to enter from one port of the casing 1 and exit through the other port. When the rotational speed of motor 12 decreases, the centrifugal force of the counterweight 41 decreases, and the pulling force of the counterweight 41 on the outer end of the fan blade 4 decreases. This causes the torsion spring to drive the folding rod 5 to wind the inner end of the fan blade 4, thus reducing the size of the outer end of the fan blade 4 extending out of the blade slot 32 and reducing wind resistance. The load is reduced to reduce energy consumption and achieve energy saving. Furthermore, during the process of the fan blade 4 retracting into the blade groove 32, dust and other impurities on the surface of the fan blade 4 are removed by the blade groove 32 to clean the surface of the fan blade 4 and reduce the rotational wind resistance of the fan blade 4 caused by impurities on the surface of the fan blade 4. When the motor 12 stops running, the counterweight bar 41 will cover the groove opening of the blade groove 32 to achieve the purpose of dust prevention. The number of the stacking groove 31 and the number of fan blades 4 in this embodiment can be customized according to the needs and are not limited to the three numbers shown in the figure. The present invention uses a counterweight 41 to pull the fan blades 4 under centrifugal force, and a coil spring to rotate and fold the stacking rod 5. This allows the specifications of the fan blades 4 on the outside of the stacking shell 3 to change with the speed of the motor 12, thereby ensuring airflow while minimizing wind resistance to achieve noise reduction and energy saving.

[0026] Example 2: The stacking shell 3 has a square groove 34 corresponding to the stacking groove 31 inside; a square plate 35 is slidably and sealingly connected inside the square groove 34; the other end of the stacking rod 5 extends into the square groove 34 and is threadedly and sealingly connected to the square plate 35; the stacking shell 3 has an annular adjustment groove 36 inside; an adjustment plate 37 is movably and sealingly connected inside the adjustment groove 36; the adjustment groove 36 has a threaded hole 361 near the groove wall of the motor 12 facing the motor 12; an adjustment bolt 362 is threadedly connected inside the threaded hole 361; the square groove 34 and the adjustment groove 36 are connected at one end near each other through a first liquid hole 363.

[0027] In this embodiment, the adjustment groove 36 is a single one; the ends of the multiple square grooves 34 near the motor 12 are connected to the ends of the single adjustment groove 36 away from the motor 12 through the first liquid hole 363.

[0028] For ease of description, in this embodiment, the directional plate divides the space within the square slot 34 into a first cavity 311 near the stacking slot 31 and a second cavity 312 away from the stacking slot 31; the adjusting plate 37 divides the internal space of the adjusting slot 36 into a third cavity 365 near the square slot 34 and a fourth cavity 366 away from the square slot 34. During the rotation of the motor 12, the motor 12 drives the output shaft 2 and the stacking shell 3 to rotate. During the rotation of the stacking shell 3, multiple counterweights 41 will rotate accordingly. Under the action of centrifugal force, the multiple counterweights 41 will pull the fan blades 4, so that the inner end of the fan blades 4 will be unwound from the stacking rod 5 over the coil spring body 51. The stacking rod 5 will rotate during the unwinding process of the fan blades 4, and the other end of the stacking rod 5 extends... The other end of the folding rod 5 rotates as the folding rod 5 rotates into the square groove 34. The other end of the folding rod 5 is threadedly sealed to the square plate 35. Therefore, during the rotation of the folding rod 5, it will drive the square plate 35 to move closer to the motor 12 in the square groove 34. This makes the space of the first cavity 311 larger and the space of the second cavity 312 smaller. The liquid medium in the second cavity 312 flows into the third cavity 365 of the regulating groove 36 along the first liquid hole 363 under the pressure of the square plate 35. This increases the liquid in the third cavity 365. The regulating plate 37 in the regulating groove 36 will slide along the inner wall of the regulating groove 36 under the pressure of the liquid in the third cavity 365. The longer the fan blade 4 extends from the blade groove 32, the more likely it is to become a fan blade. The larger the space within the third cavity 365, the smaller the space within the third cavity 365 becomes if the length of the fan blade 4 extending from the blade slot 32 is shorter. Thus, by limiting the maximum space within the third cavity 365, the extension of the fan blade 4 from the blade slot 32 can be restricted, achieving maximum specification limitation and adjustment of the fan blade 4. Specifically, before using the fan, first tighten the adjusting bolt 362. Tightening the adjusting bolt 362 will cause it to rotate within the threaded hole 361. This rotation changes the length of the adjusting bolt 362 extending into the adjusting slot 36. The longer the adjusting bolt 362 extends into the adjusting slot 36, the more the space within the third cavity 365 is restricted, and the smaller the maximum opening space of the third cavity 365 becomes, thus limiting the fan blade's extension. The upper limit of the blade 4 extending out of the blade slot 32 decreases; the shorter the adjustment bolt 362 extends into the adjustment slot 36, the less the space in the third cavity 365 is restricted, and the larger the limit space of the third cavity 365 opening; after the adjustment plate 37 stops contacting the adjustment bolt 362 in the adjustment slot 36, the fan blade 4 will extend out of the blade slot 32 to the limit length; furthermore, the number of adjustment slots 36 is single, and multiple second cavities 312 are connected to the same third cavity 365 through the first liquid hole 363, so the hydraulic pressure in multiple second cavities 312 is the same, so that the length of multiple fan blades 4 extending out of the blade slot 32 is the same, so as to ensure that the force balance of the multiple fan blades 4 driven by the stacking shell 3 is balanced, and the rotation stability of the fan is improved;In this embodiment, by adjusting the bolt 362 to rotate within the threaded hole 361, the movement of the adjusting plate 37 within the adjusting groove 36 is limited, thereby limiting the maximum length of the fan blade 4 extending from the blade groove 32 to meet the usage requirements of different scenarios.

[0029] Example 3: The fan blade 4 is provided with a reinforcing groove 42 inside; the two larger groove walls of the reinforcing groove 42 are connected by multiple limiting blocks 43; the groove wall of the adjusting groove 36 away from the square groove 34 is connected to the inside of the reinforcing groove 42 through the second liquid hole 364; the second liquid hole 364 is provided inside the stacking rod 5 and the stacking shell 3; the threaded hole 361 is threadedly sealed to the adjusting bolt 362.

[0030] In this embodiment, a flexible extension tube 44 is provided diagonally on the inner wall of the reinforcing groove 42; one end of the extension tube 44 is open and the other end is connected to the second liquid hole 364.

[0031] As the stacking shell 3 rotates with the output shaft 2, the counterweight 41, under centrifugal force, pulls the inner end of the fan blade 4 from the stacking rod 5 to unwind it. The fan blade 4 extends out of the blade groove 32. During the unwinding process, the stacking rod 5 causes the square plate 35 to slide along the square groove 34, making the space of the first cavity 311 larger and the space of the second cavity 312 smaller. The liquid medium in the second cavity 312 flows into the third cavity 365 through the first liquid hole 363. The expansion of the space of the third cavity 365 causes the adjusting plate 37 to squeeze the fourth cavity 366. The liquid medium in the fourth cavity 366, under pressure, flows into the reinforcing groove 42 through the second liquid hole 364, thus filling the reinforcing groove 42 with liquid medium. This increases the internal strength of the unfolded fan blade 4, thereby improving the strength of the fan blade 4 during the rotation of the stacking shell 3, making the air volume generated by the fan rotation more stable. After the rotational speed of the stacking shell 3 decreases, the coil spring body 51 will drive the stacking rod 5 to rotate and coil the fan blade 4. During the rotation of the stacking rod 5, the square plate 35 will slide along the square groove 34, making the space of the first cavity 311 smaller and the space of the second cavity 312 larger. The liquid medium in the third cavity 365 will flow into the second cavity 312 along the first liquid hole 363, and the space of the fourth cavity 366 will increase. The liquid medium in the reinforcing groove 42 will flow back into the fourth cavity 366 along the second liquid hole 364. In this embodiment, during the unfolding process of the fan blade 4 as the centrifugal force increases, the reinforcing groove 42 inside the fan blade 4 is filled with liquid medium. During the folding process of the fan blade 4 as the centrifugal force decreases, the liquid medium inside the reinforcing groove 42 inside the fan blade 4 is removed. This makes the liquid medium inside the fan blade 4 adapt to the length of the fan blade 4 extending out of the blade groove 32, thereby ensuring the working effect of the fan blade 4. Furthermore, flexible extension tubes 44 are diagonally arranged within the reinforcing groove 42. These extension tubes 44 possess sufficient strength to ensure the folding of the fan blades 4. Thus, during the unfolding of the fan blades 4, the liquid medium within the fourth cavity 366 can flow along the second liquid hole 364 and the extension tubes 44 to the end of the reinforcing groove 42 furthest from the folding rod 5, thereby ensuring good liquid filling of the reinforcing groove 42 within the fan blades 4. During the folding of the fan blades 4, the liquid medium within the reinforcing groove 42 can flow away along the strong and flexible extension tubes 44. Finally, the liquid flows back to the fourth chamber 366 through the second liquid hole 364, thus allowing the liquid medium in the fan blade 4 during the stacking process to be smoothly discharged, ensuring the smooth stacking of the fan blade 4 by the stacking rod 5. Since the extension tube 44 is diagonally arranged in the reinforcing groove 42, after the fan blade 4 is stacked on the outer wall of the stacking rod 5, the stacked extension tube 44 can be staggered in the axial direction of the stacking rod 5, so as to ensure that the extension tube 44 is stacked while avoiding the situation of cross stacking of the extension tube 44 causing flattening and obstruction, thus allowing the liquid to flow smoothly along the inner wall of the extension tube 44.

[0032] Example 4: The outer wall of the output shaft 2 is provided with a sliding groove 21; a sliding strip 22 is slidably connected in the sliding groove 21; the sliding strip 22 is fixedly connected to the inner wall of the stacking shell 3; a rotating ring 38 is rotatably connected to one end of the stacking shell 3 near the motor 12; the rotating ring 38 is connected to the motor 12 by a spring 381.

[0033] In this embodiment, the arc-shaped outer wall of the stacked shell 3 is connected to the first bolt 39 along the radial thread; the first bolt 39 is in contact with the bottom of the groove 21.

[0034] During the rotation of the output shaft 2 driven by the motor 12, the output shaft 2 drives the slide bar 22 in the slide groove 21 and the folding shell 3 connected to the slide bar 22 to rotate. The folding shell 3 drives the fan blades 4 on the outer wall to rotate. During the rotation of the fan blades 4, a wind is generated away from the motor 12, and the wind direction is from the motor 12 to the folding shell 3. As the fan blades 4 blow the wind forward, a reaction force is generated towards the motor 12. When the fan blades 4 rotate at a lower speed, the reaction force towards the motor 12 is smaller. This allows the fan blades 4 and the folding shell 3 to be pushed closer to the air outlet of the housing 1 under the elastic force of the spring 381, thereby improving the air delivery efficiency and effect. When the fan blades 4 rotate at a higher speed, the fan blades 4 will move closer to the motor 12 under the action of the reaction force, thereby reducing the distance between the folding shell 3 and the motor 12. The distance is adjusted to reduce the lever arm, making the rotation of the folding shell 3 and the fan blades 4 driven by the motor 12 more stable, thereby improving the stability of the fan operation. In this embodiment, the spring 381 is fixed to the motor 12 at one end and rotated to the folding shell 3 at the other end through the rotating ring 38. Therefore, the spring 381 ensures the elastic pushing force on the folding shell 3 while reducing the friction between the spring 381 and the folding shell 3. In addition, in this embodiment, the first bolt 39 can be selectively tightened. After being tightened, the first bolt 39 is pressed against the bottom of the slide groove 21 to achieve axial locking between the folding shell 3 and the output shaft 2 through friction. After the first bolt 39 disengages from the slide groove 21, the folding shell 3 and the output shaft 2 are unlocked. The first bolt 39 can be selectively tightened according to the needs to suit various situations.

[0035] Example 5: The square groove 34 is connected to the corresponding stacking groove 31 through the first air hole 343; the square groove 34 is connected to the outer wall of the stacking shell 3 through a one-way air inlet 344 near the groove wall of the stacking groove 31; and a one-way air outlet 313 is provided around the groove opening of the stacking groove 31 and the blade groove 32.

[0036] As the rotational speed of the stacking shell 3 increases, the fan blade 4 extends along the blade groove 32, and the space of the first cavity 311 increases. External gas enters the first cavity 311 through the one-way air inlet 344 to replenish the gas. As the rotational speed of the stacking shell 3 decreases, the space inside the first cavity 311 decreases, and the gas inside the first cavity 311 is discharged through the first air hole 343, the stacking groove 31, and the one-way air outlet 313, thereby flushing away impurities around the opening of the blade groove 32 to ensure the shielding effect of the counterweight bar 41 on the opening of the blade groove 32.

[0037] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description only, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be construed as indicating or implying relative importance.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. 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 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 and energy-saving fan, comprising a housing and filters at both ends of the housing; a motor is fixedly connected inside the housing; an output shaft is fixedly connected to the output end of the motor; characterized in that: The outer wall of the output shaft is connected to a ring-shaped folding shell; the inside of the folding shell is uniformly arranged with inclined folding grooves around the center; a blade groove is provided through the folding grooves facing outwards; the blade grooves pass through and are movably connected to fan blades; the fan blades are made of flexible material; the folding grooves are rotatably connected to a folding rod along the axial direction; one inner end of the fan blade is fixedly connected to the outer wall of the folding rod, and the rear end of the fan blade is fixedly connected to a counterweight bar; the inside of the folding shell is provided with a coil spring groove corresponding to the folding grooves; one end of the folding rod extends into the coil spring groove and is twisted to the coil spring body.

2. The silent energy-saving fan according to claim 1, characterized in that: The cross-section of the blade groove is adapted to the cross-section of the fan blade; the counterweight bar is larger than the blade groove opening and can cover the blade groove opening; the counterweight bar is adapted to the outer wall of the stacking shell.

3. The silent energy-saving fan according to claim 1, characterized in that: The stacking shell has a square groove corresponding to the stacking slot inside; a square plate is slidably and sealingly connected inside the square groove; the other end of the stacking rod extends into the square groove and is threadedly and sealingly connected to the square plate; the stacking shell has an annular adjustment groove inside; an adjustment plate is movably and sealingly connected inside the adjustment groove; the adjustment groove has a threaded hole near the motor slot wall facing the motor; an adjustment bolt is threadedly connected inside the threaded hole; the square groove and the adjustment groove are connected at one end near each other through a first liquid hole.

4. A silent and energy-saving fan according to claim 3, characterized in that: The adjustment slot is a single one; the ends of the multiple square slots near the motor are connected to the ends of the single adjustment slot away from the motor through a first liquid hole.

5. A silent and energy-saving fan according to claim 3, characterized in that: The fan blades are provided with a reinforcing groove inside; the two larger groove walls of the reinforcing groove are connected by multiple limiting blocks; the groove wall of the adjusting groove away from the square groove is connected to the inside of the reinforcing groove through a second liquid hole; the second liquid hole is located inside the stacking rod and the stacking shell.

6. A silent and energy-saving fan according to claim 5, characterized in that: The inner wall of the reinforcing trough is provided with flexible extension tubes at opposite corners; one end of the extension tube is open and the other end is connected to the second liquid hole.

7. A silent and energy-saving fan according to claim 1, characterized in that: The outer wall of the output shaft is provided with a sliding groove; a slide bar is slidably connected in the sliding groove; the slide bar is fixedly connected to the inner wall of the stacking shell; a rotating ring is rotatably connected to one end of the stacking shell near the motor; the rotating ring is connected to the motor by a spring.

8. A silent and energy-saving fan according to claim 7, characterized in that: The arc-shaped outer wall of the stacked shell is connected to a first bolt along a radial thread; the first bolt contacts the bottom of the sliding groove.

9. A silent and energy-saving fan according to claim 3, characterized in that: The square groove is connected to the corresponding stacking groove through the first air hole; the square groove is connected to the outer wall of the stacking shell through a one-way air inlet near the groove wall of the stacking groove, and a one-way air outlet is provided around the groove opening of the stacking groove and the blade groove.

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