A labyrinth seal blower
By setting grates and grating grooves on the blade tip and the inner wall of the duct, the vibration and noise problems caused by airflow leakage in the blower are solved, achieving better sealing effect and noise reduction performance, and avoiding the use of additional components.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG YAT ELECTRICAL APPLIANCE CO LTD
- Filing Date
- 2025-06-13
- Publication Date
- 2026-08-04
AI Technical Summary
In existing hair dryers, the gap between the tip of the fan blades and the inner wall of the duct causes airflow leakage, resulting in uneven airflow distribution, which in turn causes motor or housing vibration and aerodynamic noise. Existing noise reduction methods increase the weight and complexity of components and have limited noise reduction effects.
Grate teeth and grooves are installed on the blade tip and the inner wall of the duct to reduce the gap. The combination of the grates and grooves forms a multi-stage dissipation barrier, which changes the leakage airflow path, suppresses the formation of unstable vortices, increases the sealing airflow resistance, and reduces vibration and noise.
It significantly reduces airflow leakage, lowers aerodynamic noise, improves fan balance and operational stability, avoids the influence of additional components on dynamic balance, and has a simple and reliable structure.
Smart Images
Figure CN224592420U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of garden tools, and in particular to a comb-tooth sealing blower. Background Technology
[0002] A hair dryer is a tool that uses a high-speed rotating fan to generate high-speed airflow for cleaning up garden debris such as fallen leaves and grass clippings. However, in existing hair dryers, there is a large gap between the tip of the fan blades and the inner wall of the duct, causing some airflow to leak through this gap during flow. This results in uneven airflow distribution, leading to unbalanced forces on the blades, causing vibration of the motor or housing, and generating structural vibration noise. Simultaneously, the leaked airflow can easily form unstable vortices, further generating significant aerodynamic noise. To address these issues, existing technologies, such as utility model CN222415360U, propose placing sound-absorbing pads on the fan blades to reduce noise. Alternatively, some solutions involve adding porous sound-absorbing materials to the housing or duct section to absorb noise. However, these methods typically require additional components, increasing weight and the risk of affecting the fan's dynamic balance. They also result in complex structures, increased manufacturing costs, and, essentially, only blocking existing noise rather than reducing noise generation at its source, thus offering limited noise reduction effectiveness. Utility Model Content
[0003] The purpose of this invention is to provide a toothed sealing blower that solves the problem of limited noise reduction effect in the prior art. It has a simple structure and improves the noise reduction effect.
[0004] To achieve the above objectives, the present invention adopts the following technical solution: a toothed sealing blower, comprising a housing having an air inlet end and an air outlet end, and an air outlet pipe connected to the air outlet end of the housing. The housing is provided with a duct for guiding the airflow from the air inlet end to the air outlet end. A fan and a drive motor for driving the fan are installed in the duct. The fan includes a hub that mates with the drive motor and a plurality of blades mounted on the hub. The tips of the blades and one of the inner walls of the duct are provided with teeth, and the other is provided with a tooth groove. The teeth are adapted to the tooth groove and at least partially extend into the tooth groove to reduce the gap between the tips of the blades and the inner wall of the duct.
[0005] After adopting the above technical solution, the present invention has the following advantages: By setting grates at the tips of the blades and setting corresponding grates grooves on the inner wall of the duct, the gap between the tips of the blades and the duct can be significantly reduced, thereby effectively suppressing the leakage of the main airflow at the tips of the blades. It also changes the flow path of the leaking airflow, causing it to repeatedly turn, collide, and dissipate energy between the grates and the grates grooves, forming multi-stage dissipation obstruction of the airflow, greatly weakening its energy, destroying the formation conditions of unstable vortices, fundamentally reducing the aerodynamic noise caused by airflow leakage, increasing the airflow resistance of the grates seal, thereby reducing the leakage at the tips of the blades, and the blades tend to be balanced by force, reducing the vibration during the operation of the fan, thereby reducing structural vibration noise and improving the overall operating stability. The grates structure does not rely on sound-absorbing materials or additional noise reduction components, and will not disrupt the original dynamic balance of the fan by adding components, reducing the impact on the dynamic balance of the fan. The structure is simple and reliable.
[0006] Furthermore, the sieve teeth are provided with at least two, and the number of sieve tooth grooves is not less than the number of sieve teeth.
[0007] Using the aforementioned technical solution, multiple grates can form multi-stage barriers to the leaking airflow, causing the airflow to repeatedly turn, collide, and dissipate energy between multiple grates and grating slots. This more effectively weakens the intensity of the leaking airflow, suppresses the formation of unstable vortices, significantly reduces aerodynamic noise, and increases the airflow resistance of the grating seal, thereby further reducing tip leakage of the blades. Having more or more grating slots than grates ensures that the grates are always nested within the grating slots when the fan is rotating at high speed, avoiding seal failure due to misalignment and achieving a dynamic sealing effect. The leaking airflow is repeatedly turned and dissipated by more grating slots, significantly suppressing the generation of unstable vortices.
[0008] Furthermore, the teeth are straight teeth, triangular teeth, wavy teeth, or functional teeth, and the shape of the tooth groove is adapted to the shape of the teeth.
[0009] Using the aforementioned technical solutions, the straight-tooth structure is simple, easy to manufacture, and low in cost, making it suitable for basic hair dryers with moderate sealing and noise reduction requirements. The sharp angle of the triangular teeth provides stronger airflow segmentation, effectively reducing leakage and improving sealing performance. The wavy teeth, with their irregular contours, increase the airflow path length, further weakening the intensity of leaking airflow and providing better noise reduction. The functional teeth, designed based on specific fluid dynamics functions, can precisely control airflow direction, achieving the optimal balance between airflow efficiency and noise reduction in high-performance hair dryers. Different tooth shapes can adapt to different usage scenarios. In hair dryers requiring high speed and strong airflow, functional and wavy teeth better handle complex airflow environments and maintain stable sealing. In scenarios where durability and low cost are paramount, the straight-tooth structure is more wear-resistant and easier to manufacture, reducing maintenance costs and failure rates. The shape of the tooth grooves is matched to the tooth profile, ensuring a good fit clearance between them, guaranteeing normal fan operation while maximizing the limitation of airflow leakage paths.
[0010] Furthermore, the toothed grooves are annular grooves arranged circumferentially along the inner wall of the duct.
[0011] By adopting the aforementioned technical solution, when the fan rotates, the grates are always nested with the grating grooves to form a continuous sealing path, avoiding seal failure due to changes in the angle and reducing airflow leakage from the tips of the blades.
[0012] Furthermore, the fan and drive motor are arranged sequentially from the air inlet to the air outlet, and the hub is provided with multiple heat dissipation holes. When the fan rotates, it generates a cooling airflow that flows into the heat dissipation holes and passes through the drive motor.
[0013] By adopting the aforementioned technical solution, by placing the drive motor downstream of the fan blades (i.e. after the air intake direction), the negative pressure effect generated when the fan is running can be used to draw in external cold air from the heat dissipation holes on the hub, forming a heat dissipation airflow path through the motor. Without the need for additional cooling fans or airflow guiding structures, the active air cooling effect of the drive motor can be achieved, significantly improving the heat dissipation efficiency of the drive motor.
[0014] Furthermore, the duct is also provided with a mounting base for installing the drive motor. The mounting base and the inner wall of the duct are connected by multiple guide plates, which are spaced apart to allow airflow from the fan to pass through.
[0015] Through the above technical solution, the guide vane not only serves to fix and support the drive motor, but also acts as part of the airflow channel. Its spaced arrangement can effectively guide the airflow output by the fan to flow smoothly, reduce airflow turbulence and noise, and improve the overall aerodynamic performance.
[0016] Furthermore, the blades are arc-shaped, and the thickness of the blades gradually increases from both ends to the middle in the axial direction; and / or, the duct located downstream of the fan is also provided with a guide cone; and / or, the inner diameter of the air outlet pipe gradually decreases from the air outlet end of the housing downstream.
[0017] Through the above technical solutions, the thicker design in the middle of the blade enhances its structural strength and rigidity during high-speed rotation, effectively resisting deformation or fatigue damage caused by aerodynamic loads and centrifugal forces, thus ensuring the blade's service life. Simultaneously, the thinner ends of the blade reduce inlet resistance, making it easier for airflow to be drawn in and accelerated, improving fan start-up performance and overall efficiency. The guide cone effectively rectifies the rotating airflow at the fan outlet, reducing airflow turbulence and eddy current losses, and improving the axial flow stability of the airflow, thereby increasing the effective air pressure and airflow output of the blower. Furthermore, the guide cone also improves the airflow distribution at the rear of the fan, reducing aerodynamic noise caused by airflow separation. The gradually narrowing inner diameter of the outlet duct utilizes the Venturi effect to accelerate the airflow, further increasing the outlet velocity and enhancing the blowing effect.
[0018] Furthermore, the housing is also provided with a heat dissipation duct that is independently set up from the duct. The heat dissipation duct is equipped with a controller that is electrically connected to the drive motor. The air inlet of the heat dissipation duct is connected to the external environment, and the air outlet of the heat dissipation duct is connected to the duct. When the fan rotates, a negative pressure chamber is formed in the duct to draw the heat dissipation airflow of the heat dissipation duct.
[0019] The above technical solution utilizes the negative pressure of the fan to achieve passive heat dissipation, effectively reducing the controller temperature and preventing performance degradation or malfunctions caused by high temperatures, thereby improving the overall operational stability of the machine. No additional fan or power unit is required, resulting in a simple structure. At the same time, the airflow of the heat dissipation duct merges into the main airflow of the duct, effectively increasing the overall output flow of the blower.
[0020] Furthermore, the duct is provided with a threading groove or threading hole for threading the wires between the controller and the drive motor, and the air outlet of the heat dissipation duct is connected to the duct through the threading groove or threading hole.
[0021] Through the above technical solution, the duct is provided with a wire-passing groove or wire-passing hole. This structure is not only used to pass the wire harness between the controller and the drive motor, but also serves as the air outlet channel of the heat dissipation air duct, realizing the integration of ventilation and wire-passing functions, making the whole machine structure more compact and efficient, and also realizing active cooling of the line.
[0022] Furthermore, the wire channel or wire hole is located downstream of the fan; and / or, the wire channel or wire hole is located downstream of the drive motor.
[0023] With the above technical solution, if the cable tray or cable hole is located upstream of the fan and / or drive motor, the hot air discharged from the cooling duct will pass through the fan and / or drive motor, causing secondary heating and affecting the service life of the fan and / or drive motor. The hot air discharged from the cooling duct no longer passes through the fan or motor area, avoiding secondary heating of key components, improving overall heat dissipation efficiency, and not affecting the stability of the fan inlet airflow. This can avoid uneven air intake caused by hot air disturbance or airflow turbulence, help reduce aerodynamic noise, especially high-frequency noise caused by airflow disturbance and eddies, and further improve the quietness and comfort of the product during use. Attached Figure Description
[0024] The present invention will be further described below with reference to the accompanying drawings:
[0025] Figure 1 This is a schematic diagram of the structure of the comb-tooth sealing blower of this utility model;
[0026] Figure 2 This is an exploded view of the comb-tooth sealing blower of this utility model;
[0027] Figure 3 This is a schematic diagram of the airflow during the operation of the comb-tooth sealing blower of this utility model;
[0028] Figure 4 For the present utility model Figure 3 Enlarged view of the structure at point A in the middle;
[0029] Figure 5 This is a schematic diagram of the collector and fan of this utility model;
[0030] Figure 6 For the present utility model Figure 5 Enlarged view of the structure at point B;
[0031] Figure 7 This is a schematic diagram of the current collector of this utility model;
[0032] Figure 8 This is a schematic diagram of the fan structure of this utility model;
[0033] In the diagram, 10 is the housing; 11 is the air inlet; 111 is the air inlet shroud; 12 is the air outlet; 13 is the collector; 131 is the duct; 1311 is the cable tray; 1312 is the grate groove; 1313 is the gap; 14 is the mounting base; 15 is the guide plate; 16 is the guide cone; 17 is the heat dissipation duct; 171 is the air inlet; 172 is the air outlet; 18 is the handle; 19 is the battery; 20 is the air outlet pipe; 30 is the fan; 31 is the hub; 311 is the heat dissipation hole; 32 is the blade; 33 is the grate; 40 is the drive motor; and 50 is the controller. Detailed Implementation
[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.
[0035] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein.
[0036] It should be understood that in the various embodiments of this utility model, the number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this utility model.
[0037] It should be understood that in this invention, "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product or device.
[0038] It should be understood that in this utility model, "multiple" refers to two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, X and / or Y can represent: X alone, X and Y simultaneously, or Y alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "Contains X, Y, and Z", "Contains X, Y, and Z" means that all three X, Y, and Z are contained; "Contains X, Y, or Z" means that one of X, Y, and Z is contained; "Contains X, Y, and / or Z" means that any one, two, or three of X, Y, and Z are contained.
[0039] The technical solution of this utility model will be described in detail below with specific embodiments. The following specific embodiments can be selected to be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments.
[0040] like Figures 1 to 8As shown, this utility model provides a toothed sealing blower, including a housing 10 with an air inlet end 11 and an air outlet end 12, and an air outlet pipe 20 connected to the air outlet end 12 of the housing 10. The housing 10 is provided with a duct 131 for guiding the airflow from the air inlet end 11 to the air outlet end 12. A fan 30 and a drive motor 40 for driving the fan 30 are installed in the duct 131. The fan 30 includes a hub 31 that mates with the drive motor 40 and a plurality of blades 32 mounted on the hub 31. The tips of the blades 32 are provided with teeth 33. The inner wall of the duct 131 is provided with tooth grooves 1312. The teeth 33 are adapted to the tooth grooves 1312 and at least partially extend into the tooth grooves 1312 to reduce the gap 1313 between the tips of the blades 32 and the inner wall of the duct 131.
[0041] By setting grates 33 at the tip of the blade 32 and corresponding grates grooves 1312 on the inner wall of the duct 131, the gap 1313 between the tip of the blade 32 and the duct 131 can be significantly reduced, thereby effectively suppressing the leakage of the main airflow at the tip of the blade 32. It also changes the flow path of the leaking airflow, causing it to repeatedly turn, collide, and dissipate energy between the grates 33 and the grates grooves 1312, forming a multi-stage dissipation block for the airflow, greatly weakening its energy, destroying the formation conditions of unstable vortices, fundamentally reducing the aerodynamic noise caused by airflow leakage, increasing the airflow resistance of the grates 33 seal, thereby reducing the leakage at the tip of the blade 32, and the blade 32 tends to be in equilibrium, reducing the vibration during the operation of the fan 30, thereby reducing structural vibration noise and improving the overall operating stability. The grates 33 structure does not rely on sound-absorbing materials or additional noise reduction components, and will not disrupt the original dynamic balance of the fan 30 by adding components, reducing the impact on the dynamic balance of the fan 30. The structure is simple and reliable.
[0042] It should be noted that the duct 131 is cylindrical, and the grate grooves 1312 are annular grooves arranged circumferentially along the inner wall of the duct 131. When the fan 30 rotates, the grate teeth 33 are always nested with the grate grooves 1312, forming a continuous sealing path, avoiding seal failure due to changes in angle, and reducing airflow leakage from the tip of the blades 32. The axes of the drive motor 40 and the fan 30 are both located on the axis of the duct 131, which conforms to the axial flow characteristics of the airflow in the duct 131, which is conducive to smooth airflow and reduces airflow disturbance caused by eccentricity. The fan 30 rotates at the axis position of the duct 131, which can ensure that the air inlet and outlet paths are symmetrical and uniform, and improve the consistency of air pressure distribution. The air inlet 11 of the housing 10 is equipped with an air inlet shroud 111, which features a filter or grille to effectively block larger particles, leaves, or other debris from entering the blower, protecting the fan 30 and motor from damage. The filter or grille also optimizes the shape and path of the air inlet 11, reducing turbulence and airflow impact noise, thereby lowering overall operating noise. The duct 131 is formed by a collector 13, which is detachably connected to the housing 10. A handle 18 and a battery 19 are also mounted on the housing 10.
[0043] Furthermore, at least two grates 33 are provided, and the number of grates grooves 1312 is not less than the number of grates 33. Multiple grates 33 can form multi-stage barriers to leaking airflow, causing the airflow to repeatedly turn, collide, and dissipate energy between the multiple grates 33 and grates grooves 1312. This more effectively weakens the intensity of leaking airflow, suppresses the formation of unstable vortices, significantly reduces aerodynamic noise, and also increases the airflow resistance of the grates 33 seal, thereby further reducing tip leakage of the blades 32. In this embodiment, the number of grates grooves 1312 is greater than the number of grates 33, ensuring that when the fan 30 rotates at high speed, the grates 33 are always nested with the grates grooves 1312, avoiding sealing failure due to misalignment, achieving a dynamic sealing effect. The leaking airflow is repeatedly turned and dissipated by more grates grooves 1312, significantly suppressing the generation of unstable vortices.
[0044] It should be noted that the number of grates 33 can be set to two, three, four, or other appropriate quantities, and arranged sequentially along the air inlet 11 toward the air outlet 12.
[0045] Among them, the grating teeth 33 are wavy teeth. The wavy teeth increase the length of the airflow path through the irregular contour, which can further weaken the intensity of the leaking airflow and have a good noise reduction effect. The shape of the grating tooth groove 1312 is adapted to the shape of the grating teeth 33 to ensure that a good fit gap 1313 is formed between the two as much as possible, which can ensure the normal operation of the fan 30 and limit the airflow leakage path to the maximum extent.
[0046] Furthermore, the blade 32 is arc-shaped, and its thickness gradually increases from both ends to the middle in the axial direction. The thicker design in the middle of the blade 32 enhances its structural strength and rigidity during high-speed rotation, effectively resisting deformation or fatigue damage caused by aerodynamic loads and centrifugal forces, thus ensuring the service life of the blade 32. At the same time, the thinner ends of the blade 32 help reduce airflow resistance, making it easier for airflow to be drawn in and accelerated, thereby improving the start-up performance and overall efficiency of the fan 30.
[0047] To improve airflow, a guide cone 16 is provided downstream of the fan 30 in the duct 131. The guide cone 16 can effectively rectify the rotating airflow at the outlet of the fan 30, reduce airflow turbulence and eddy loss, and improve the axial flow stability of the airflow, thereby increasing the effective air pressure and air volume output of the blower. At the same time, the guide cone 16 can also improve the airflow distribution at the rear of the fan 30 and reduce aerodynamic noise caused by airflow separation.
[0048] Furthermore, the inner diameter of the air outlet duct 20 gradually decreases downstream from the air outlet end 12 of the housing 10, utilizing the Venturi effect to accelerate airflow, further increasing the air velocity at the air outlet and enhancing the blowing effect. The air outlet duct 20 can be set in multiple sections, and multiple sections of the air outlet duct 20 can be assembled to form a longer air outlet channel.
[0049] During prolonged operation of the fan 30, the drive motor 40 experiences a rapid temperature rise. Excessive temperature can negatively impact the performance of the drive motor 40, potentially triggering high-temperature protection and causing it to slow down. Therefore, in this application, the fan 30 and drive motor 40 are arranged sequentially from the air inlet 11 to the air outlet 12. The hub 31 has multiple heat dissipation holes 311. The rotation of the fan 30 generates a cooling airflow that flows into and through the heat dissipation holes 311 and passes over the drive motor 40. This achieves active air cooling of the drive motor 40 without the need for an additional cooling fan 30 or airflow guiding structure, significantly improving the heat dissipation efficiency of the drive motor 40.
[0050] To facilitate the installation of the fan 30, a mounting base 14 for mounting the drive motor 40 is provided inside the duct 131. The mounting base 14 and the inner wall of the duct 131 are connected by multiple guide plates 15, which are spaced apart to allow airflow from the fan 30. The guide plates 15, while fixing and supporting the drive motor 40, also serve as part of the airflow channel. Their spaced arrangement effectively guides the airflow from the fan 30, reducing turbulent noise and improving overall aerodynamic performance. The guide plates 15 are arc-shaped and inclined relative to the axis of the duct 131, facilitating better airflow guidance. The guide plates 15 are radially fixed to the duct 131 and can be integrally formed with it.
[0051] The housing 10 also has a heat dissipation duct 17 that is independently set with the duct 131. The heat dissipation duct 17 is equipped with a controller 50 that is electrically connected to the drive motor 40. The air inlet 171 of the heat dissipation duct 17 is connected to the external environment, and the air outlet 172 of the heat dissipation duct 17 is connected to the duct 131. When the fan 30 rotates, a negative pressure chamber is formed in the duct 131 to draw the heat dissipation airflow of the heat dissipation duct 17, which effectively reduces the temperature of the controller 50, prevents performance degradation or failure caused by high temperature as much as possible, avoids triggering overheating and frequency reduction as much as possible, and improves the overall stability of the machine. There is no need to set up an additional fan 30 or power device, and the structure is simple. At the same time, the airflow of the heat dissipation duct 17 merges into the main airflow of the duct 131, which effectively improves the overall output flow of the blower.
[0052] The duct 131 is provided with a wire-passing groove 1311 for passing the wires between the controller 50 and the drive motor 40. The air outlet 172 of the heat dissipation air duct 17 is connected to the duct 131 through the wire-passing groove 1311. It is not only used for passing the wire harness between the controller 50 and the drive motor 40, but also serves as the air outlet channel of the heat dissipation air duct 17, realizing the integration of ventilation and wire-passing functions, making the whole structure more compact and efficient, and also realizing active cooling of the wires.
[0053] If the cable tray 1311 is located upstream of the fan 30 and the drive motor 40, the hot air discharged from the heat dissipation duct 17 will pass through the fan 30 and the drive motor 40, causing secondary heating and affecting the service life of the fan 30 and the drive motor 40. Therefore, in this application, the cable tray 1311 is located downstream of the fan 30 and the drive motor 40, so the hot air discharged from the heat dissipation duct no longer passes through the fan 30 and the motor area, avoiding secondary heating of key components, improving overall heat dissipation efficiency, and not affecting the stability of the inlet airflow of the fan 30. This can avoid uneven air intake caused by hot air disturbance or airflow turbulence, help reduce aerodynamic noise, especially high-frequency noise caused by airflow disturbance and eddies, and further improve the quietness and comfort of the product during use.
[0054] Understandably, in other embodiments, the grating teeth are straight teeth. Straight teeth have a simple structure, are easy to process and manufacture, and are relatively inexpensive, making them suitable for basic hair dryers with moderate sealing and noise reduction requirements. Of course, the grating teeth can also be triangular teeth. Triangular teeth have sharper tips, resulting in stronger airflow segmentation and effectively reducing leakage while improving sealing performance. Furthermore, the grating teeth can also be functional teeth. Functional teeth are designed based on specific fluid dynamics functions, precisely controlling airflow direction and achieving the optimal balance between airflow efficiency and noise reduction in high-performance hair dryers. Different shapes of grating teeth can adapt to different usage scenarios. In hair dryers with high speed and strong airflow requirements, functional teeth and wavy teeth can better cope with complex airflow environments and maintain stable sealing. In scenarios where durability and low cost are important, straight tooth structures are more wear-resistant and easier to manufacture, reducing maintenance costs and failure rates.
[0055] Understandably, in other embodiments, the duct is provided with a through hole for the cable between the controller and the drive motor to pass through, and the air outlet of the cooling duct is connected to the duct through the through hole. The through hole can limit the circumferential movement of the cable and also limit the airflow circumferentially. The through hole can be located downstream of the drive motor and / or the fan.
[0056] Understandably, in other embodiments, the wiring channel is located only downstream of the motor, or only downstream of the drive motor.
[0057] Understandably, in other embodiments, the blade tip is provided with a grate groove, and the inner wall of the duct is provided with grates corresponding to the grate groove. The grates are adapted to the grate groove and at least partially extend into the grate groove to reduce the gap between the blade tip and the inner wall of the duct, thereby effectively suppressing the leakage of the main airflow at the blade tip and changing the flow path of the leaking airflow, causing it to repeatedly turn, collide and dissipate energy between the grates and the grate groove, forming a multi-stage dissipation blockage of the airflow.
[0058] In addition to the preferred embodiments described above, there are other embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection claimed by this utility model.
Claims
1. A toothed sealing blower, comprising a housing (10) having an air inlet (11) and an air outlet (12), and an air outlet pipe (20) connected to the air outlet (12) of the housing (10), wherein the housing (10) is provided with a duct (131) for guiding the airflow from the air inlet (11) to the air outlet (12), and a fan (30) and a drive motor (40) for driving the fan (30) are installed in the duct (131), characterized in that, The fan (30) includes a hub (31) mating with the drive motor (40) and a plurality of blades (32) mounted on the hub (31). The tips of the blades (32) and one of the inner walls of the duct (131) are provided with grating teeth (33) and the other is provided with a grating tooth groove (1312). The grating teeth (33) are adapted to the grating tooth groove (1312) and at least partially extend into the grating tooth groove (1312) to reduce the gap (1313) between the tips of the blades (32) and the inner wall of the duct (131).
2. The slotted fence blower of claim 1, wherein, The grating teeth (33) are provided in at least two, and the number of grating tooth grooves (1312) is not less than the number of grating teeth (33).
3. The slotted fence blower of claim 1, wherein, The teeth (33) are straight teeth, triangular teeth, wavy teeth or functional teeth, and the shape of the tooth groove (1312) is adapted to the shape of the teeth (33).
4. The slotted fence blower of claim 1, wherein, The toothed groove (1312) is an annular groove arranged circumferentially along the inner wall of the duct (131).
5. The louvered containment blower of claim 1, wherein, The fan (30) and the drive motor (40) are arranged sequentially from the air inlet (11) to the air outlet (12). The hub (31) has multiple heat dissipation holes (311). When the fan (30) rotates, it forms a heat dissipation airflow that flows into the heat dissipation holes (311) and passes through the drive motor (40).
6. The louvered containment blower of claim 5, wherein, The duct (131) is also provided with a mounting base (14) for installing the drive motor (40). The mounting base (14) and the inner wall of the duct (131) are connected by a plurality of guide plates (15). The plurality of guide plates (15) are spaced apart to allow airflow output by the fan (30) to pass through.
7. The louvered containment blower of claim 1, wherein, The blade (32) is arc-shaped, and the thickness of the blade (32) gradually increases from both ends to the middle in the axial direction; and / or the duct (131) is located downstream of the fan (30) and is also provided with a guide cone (16); and / or the inner diameter of the air outlet pipe (20) gradually decreases from the air outlet end (12) of the housing (10) downstream.
8. The slotted fence blower of claim 1, wherein, The housing (10) is also provided with a heat dissipation duct (17) that is independently set with the duct (131). The heat dissipation duct (17) is provided with a controller (50) that is electrically connected to the drive motor (40). The air inlet (171) of the heat dissipation duct (17) is connected to the external environment, and the air outlet (172) of the heat dissipation duct (17) is connected to the duct (131). When the fan (30) rotates, a negative pressure chamber is formed in the duct (131) to draw the heat dissipation airflow of the heat dissipation duct (17).
9. The louvered containment blower of claim 8, wherein, The duct (131) is provided with a wire groove (1311) or wire hole for passing the wire between the controller (50) and the drive motor (40). The air outlet (172) of the heat dissipation duct (17) is connected to the duct (131) through the wire groove (1311) or wire hole.
10. The louvered containment blower of claim 9, wherein, The cable groove (1311) or cable hole is located downstream of the fan (30); and / or, the cable groove (1311) or cable hole is located downstream of the drive motor (40).