Airflow generating device

Abstract

The application provides an air flow generating device, which comprises a main shell and an air outlet shell in a split design, the main shell is provided with an air inlet, the air outlet shell is provided with an air outlet, the main shell and the air outlet shell jointly form a containing cavity containing a motor assembly, the radial dimension of the air outlet shell gradually shrinks from the second end to the first end to form a funnel-shaped air collecting chamber inside the air outlet shell, the motor assembly comprises a motor rotating around a motor axis and a fan, when the motor rotates, external air flow enters the main shell through the air inlet, and is discharged from the air outlet after passing through the air collecting chamber, and users can install air nozzles with different air outlet diameters on the air outlet shell according to different work scenes, so that the air flow generating device works in a first mode of providing large air flow or a second mode of providing high air speed, and the air outlet performance is improved; meanwhile, the whole machine is small in size, and is convenient to store and carry.

Description

Technical Field

[0001] This application belongs to the field of power tool technology, and in particular relates to an airflow generating device. Background Technology

[0002] Currently, airflow generating devices, such as dust blowers, are mainly used to provide greater wind force or wind speed to efficiently clean dust from the surface of the construction area.

[0003] In existing airflow generating devices, on the one hand, the airflow from the casing is not smooth enough, or the sealing is poor, which affects the wind force or wind speed, thus affecting the airflow performance and failing to meet the requirements of certain working conditions; on the other hand, the motor assembly is covered by a double-layer casing formed by the main casing and the outer casing, which is inconvenient to install and the overall size is large, making it difficult to store. Utility Model Content

[0004] In view of this, the purpose of this application is to provide an airflow generating device that can better meet the requirements for airflow performance and has a compact body.

[0005] To achieve the above objectives, this application provides an airflow generating device comprising:

[0006] Main housing, the main housing having an air inlet;

[0007] The air outlet shell is designed separately from the main shell and together with the main shell forms a receiving cavity; the first end of the air outlet shell has an air outlet, the second end of the air outlet shell is connected to the main shell, and the radial dimension of the air outlet shell gradually shrinks from the second end to the first end so that a funnel-shaped air gathering chamber is formed inside the air outlet shell;

[0008] A motor assembly is disposed in the receiving cavity. The motor assembly defines a motor axis and includes a motor and a fan that rotate around the motor axis. When the motor rotates, external airflow enters the main housing through the air inlet, passes through the air gathering chamber, and is discharged from the air outlet.

[0009] Several air nozzles may be selectively installed at the first end of the air outlet housing; when the air nozzles are installed in the air outlet housing, the maximum speed range of the motor is 66,000 to 80,000 rpm; the air nozzles are provided with exhaust ports, wherein the exhaust port diameter of the first air nozzle is 13 to 14 mm, and the exhaust port diameter of the second air nozzle is 9 to 10 mm.

[0010] The airflow generating device is defined as operating in a first mode when equipped with a first air nozzle and operating in a second mode when equipped with a second air nozzle. In the first mode, the air force discharged from the exhaust port ranges from 2.3 to 3.5 N. In the second mode, the air velocity discharged from the exhaust port ranges from 150 to 209 m / s. The main housing includes a main body portion that accommodates the motor assembly, and the radial dimension of the main body portion is not greater than 80 mm.

[0011] As a further improvement of an embodiment of this application, in the first mode, the maximum speed range of the motor is 66,000 to 69,000 rpm, and the air force discharged from the exhaust port is 2.7 to 2.9 N; in the second mode, the maximum speed range of the motor is 75,000 to 78,000 rpm, and the air speed discharged from the exhaust port is 195 to 209 m / s.

[0012] As a further improvement of one embodiment of this application, an air guide gap is formed between the motor assembly and the main housing, the air guide gap is connected to the airflow of the air gathering chamber, and the minimum distance of the air guide gap is not less than 5mm.

[0013] As a further improvement of one embodiment of this application, the radial dimension of the motor assembly is not greater than 65mm, and the radial dimension of the main body is not less than 75mm.

[0014] As a further improvement of one embodiment of this application, the distance between the air inlet and the air outlet is no greater than 160mm.

[0015] As a further improvement of one embodiment of this application, the axial dimension of the motor assembly is no greater than 70mm, and the distance from the end of the motor assembly near the air outlet shell to the air outlet is no greater than 60mm.

[0016] As a further improvement of one embodiment of this application, the distance from the end of the motor assembly away from the air outlet shell to the air inlet is no more than 40mm.

[0017] As a further improvement of one embodiment of this application, the bare weight of the airflow generating device is no more than 650g.

[0018] As a further improvement of one embodiment of this application, the wall thickness of the main housing is 2-4 mm.

[0019] As a further improvement of one embodiment of this application, the motor assembly is at least partially supported on the inner wall of the air outlet housing, and the projection portion of the motor assembly and the air outlet housing in the direction of the motor axis coincides; the airflow discharged from the air outlet is used for dust blowing.

[0020] The airflow generating device provided in this application features a separate design for the air outlet shell and the main shell. The air outlet shell forms a funnel-shaped air-gathering chamber to ensure smooth airflow. By employing a high-speed motor, and with users able to install nozzles of different exhaust port diameters on the air outlet shell according to different operating scenarios, the airflow generating device can operate in either a first mode providing high airflow or a second mode providing high airflow speed, thereby improving airflow performance. The integrated motor assembly, with only the main shell as a single layer on the outside of the motor assembly, results in a small radial dimension of the main shell. Furthermore, the motor assembly is supported on the inner wall of the air outlet shell, and its installation utilizes part of the internal space of the air outlet shell, reducing the overall axial dimension of the device.

[0021] In summary, the airflow generating device provided in this application has smooth airflow, strong wind force, high wind speed, and small overall size, making it convenient to store and carry. Attached Figure Description

[0022] Figure 1 This is a cross-sectional structural schematic diagram of an airflow generating device in one embodiment of this application.

[0023] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at point AA;

[0024] Figure 3 This is a rear view of the airflow generating device;

[0025] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure at point BB;

[0026] Figure 5 This is a three-dimensional structural diagram of the airflow generating device in another embodiment;

[0027] Figure 6 This is an exploded schematic diagram of the main structure of the airflow generating device in another embodiment;

[0028] Figure 7 for Figure 6 A magnified view of a section at point C;

[0029] Figure 8 for Figure 6 A magnified view of a section at point D;

[0030] Figure 9 for Figure 1 A magnified view of a section at point F in the middle;

[0031] Figure 10 for Figure 4 A magnified view of a section at point E in the middle;

[0032] Figure 11This is a schematic diagram of the motor assembly of the airflow generating device in another embodiment.

[0033] Figure label:

[0034] 100. Airflow generating device;

[0035] 10. Housing; 101. First housing; 101a. First main body; 101b. First handle; 101c. First battery interface; 102. Second housing; 102a. Second main body; 102b. Second handle; 102c. Second battery interface; 11. Main housing; 111. Air inlet; 112. Air guide gap; 113. Second positioning part; 113a. Axial wall; 113b. Rotating wall; 114. Second stop structure; 12, air outlet shell; 12a, first end of air outlet shell; 12b, second end of air outlet shell; 121, air outlet; 122, annular groove; 123, support part; 124, first positioning part; 125, first stop structure; 13, tail cover; 14, nozzle; 141, exhaust port; 15, first filter screen; 16, second filter screen; 17, support frame; 18, grip part; 19, main body part; 115, battery mounting base;

[0036] 20. Motor assembly; 201. Fan; 202. Circuit board; 203. First housing; 204. Second housing; 2041. First air outlet; 2042. Second air outlet; 205. Axial clearance; X: Motor axis;

[0037] 30. First sealing structure;

[0038] 40. Second sealing structure;

[0039] 50. Support; 51. First receiving slot;

[0040] 60. Shock-absorbing component; 61. Second receiving groove;

[0041] 70. Third sealing structure; 71. Third receiving groove;

[0042] 80. Battery pack;

[0043] 90. Gear shift button; Detailed Implementation

[0044] The present application will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present application, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of this application.

[0045] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0046] Currently, airflow generating devices, taking a dust blower as an example, typically include a housing and a motor assembly housed within the housing. The housing has an air inlet and an air outlet. The motor assembly is an integrated fan and motor unit, and the motor can be a high-speed brushless motor, widely used in the vacuum cleaner industry. The motor drives the fan to rotate, drawing in outside air through the air inlet and blowing it out through the air outlet. The greater the airflow speed, the higher the efficiency.

[0047] The air outlet is typically located at the constricted end of the casing. Due to manufacturing limitations, there are many ribs at the outlet, resulting in insufficient airflow and reduced airflow. Additionally, the motor assembly is encased in the main casing, which in turn is covered by an outer casing. This creates a double-layered casing around the motor assembly, resulting in two wall thicknesses and a larger overall size.

[0048] It is bulky and inconvenient to store.

[0049] Furthermore, the type of airflow generating device is not limited to a blower; for example, it can also be other shapes such as a linear blower, a hair dryer, or a blower.

[0050] Therefore, this application provides an airflow generating device to solve the above-mentioned technical problems. See the following embodiments for details.

[0051] Reference Figures 1 to 6An embodiment of this application provides an airflow generating device 100, including a housing 10, a motor assembly 20, and a first sealing structure 30. The housing 10 includes a main housing 11 and an air outlet housing 12. The air outlet housing 12 is mounted on the main housing 11 to form a receiving cavity. The main housing 11 has an air inlet 111, and the air outlet housing 12 has an air outlet 121 and an air gathering chamber. The air gathering chamber is formed by the inner wall of the air outlet housing 12, and the inner wall of the air outlet housing 12 is smooth. The first sealing structure 30 is located between the air outlet housing 12 and the main housing 11. The motor assembly 20 is located in the receiving cavity of the housing 10, and an air guide gap 112 is formed between the motor assembly 20 and the main housing 11. The motor assembly 20 is used to drive external air to enter the air guide gap 112 from the air inlet 111, and after being gathered in the air gathering chamber, it flows to the air outlet 121.

[0052] In the airflow generating device 100 of this application, the motor assembly 20 is housed in a cavity formed by splicing the main housing 11 and the air outlet housing 12. On the one hand, there is a guide gap between the motor assembly 20 and the main housing 11 to ensure smooth airflow. The first sealing structure 30 ensures a sealed connection between the air outlet housing 12 and the main housing 11, avoiding airflow loss at the connection during the blowing process. Moreover, the airflow is smoothly discharged from the air gathering chamber of the air outlet housing 12, improving the air outlet efficiency. On the other hand, the outer side of the motor assembly 20 has only a single-layer housing, reducing the radial dimension of the housing.

[0053] Furthermore, the motor assembly 20 includes a motor and a fan, which are integrated into one unit. The fan is located on the side of the motor near the air inlet 111. The motor drives the fan to rotate, and the generated airflow passes through the periphery of the motor.

[0054] Furthermore, the air outlet shell 12 is an integral rotating structure, specifically a funnel-shaped cover that is larger at one end and smaller at the other. The inner wall of the air outlet shell 12 has a smooth streamline shape, and the air outlet 121 is located at the smaller end of the air outlet shell 12.

[0055] like Figure 2 , Figure 3 , Figure 5 , Figure 6 As shown, in one embodiment of this application, the main housing 11 includes a first housing 101 and a second housing 102, which are joined together to form the main housing 11. A second sealing structure 40 is provided between the first housing 101 and the second housing 102. The main housing 11 is formed by the first housing 101 and the second housing 102 being joined together, and this split structure facilitates the installation and disassembly of the motor assembly 20. The second sealing structure 40 seals the joint between the first housing 101 and the second housing 102, preventing airflow from leaking out from the joint gap between the first housing 101 and the second housing 102 during the blowing process.

[0056] Optionally, the second sealing structure 40 is a strip gasket structure, sandwiched between the mating surfaces of the first housing 101 and the second housing 102.

[0057] like Figure 1 , Figure 2 , Figure 6 As shown, in one embodiment of this application, the airflow generating device 100 further includes a bracket 50, and the motor assembly 20 is connected to the air outlet housing 12 through the bracket 50. The bracket 50 supports the end of the motor assembly 20 and, while fixing the end of the motor assembly 20, also makes full use of the internal space of the air outlet housing 12, reducing the overall axial dimension of the device.

[0058] In this embodiment, the bracket 50 is fixedly installed on the inner wall of the air outlet shell 12, and a ventilation opening is left between the bracket 50 and the inner wall of the air outlet shell 12 for airflow to pass through. The end of the motor assembly 20 is supported and fixed by the bracket 50 located inside the air outlet shell 12.

[0059] like Figure 1 , Figure 2 , Figure 6 As shown in one embodiment of this application, the airflow generating device 100 further includes a shock absorber 60, which is located between the bracket 50 and the motor assembly 20. The motor assembly 20 generates vibration during operation. In this embodiment, by providing the shock absorber 60 between the bracket 50 and the motor assembly 20, vibration can be reduced during operation of the motor assembly 20, preventing vibration from being transmitted through the bracket 50 to the housing and thus affecting its use.

[0060] like Figure 6 As shown, in one embodiment, the bracket 50 has a first receiving groove 51 that matches the shape of the shock absorber 60, and the shock absorber 60 is located in the first receiving groove 51. The shock absorber 60 is fixed by the first receiving groove 51 to prevent it from shifting under the vibration of the motor assembly 20, thus affecting the shock absorption effect.

[0061] Furthermore, both the damper 60 and the first receiving groove 51 have square cross-sectional profiles along the direction perpendicular to the axial direction. In other embodiments, the cross-sectional profiles of the damper 60 and the first receiving groove 51 may also be polygonal, circular, or other irregular shapes.

[0062] In one embodiment, the shock absorber 60 has a second receiving groove 61, and the end portion of the motor assembly 20 near the air outlet 121 is covered within the second receiving groove 61. The second receiving groove 61 on the shock absorber 60 secures the end of the motor assembly 20, absorbing some vibration energy during operation. Optionally, the second receiving groove 61 corresponds to the shape of the shock absorber 60 and is also square. The end of the motor assembly 20 has a square protrusion adapted to the second receiving groove 61, which serves to prevent the motor assembly 20 from rotating during operation.

[0063] Specifically, the end of the motor assembly 20 is embedded inside the shock absorber 60, and the shock absorber 60 is embedded inside the bracket 50. This nested structure can limit the end of the motor assembly 20 in multiple directions, both circumferentially and axially, and prevent the motor assembly 20 from causing large vibrations to the whole machine by setting the shock absorber 60.

[0064] In one embodiment of this application, the first sealing structure 30 includes a sealing ring, and an annular groove 122 for accommodating the sealing ring is provided at the end of the air outlet shell 12. The sealing ring is compressed within the annular groove 122, ensuring airtightness at the connection between the air outlet shell 12 and the main shell 11, effectively preventing air leakage at the connection. Optionally, two annular ribs are provided on the end of the air outlet shell 12 that extends into the main shell 11, forming two groove walls of the annular groove 122, with the opening of the annular groove 122 facing the inner surface of the main shell 11.

[0065] Alternatively, the annular groove 122 accommodating the first sealing structure 30 can also be provided on the main housing 11, with the opening of the annular groove 122 facing the outer surface of the end of the air outlet housing 12.

[0066] like Figure 1 , Figure 4 , Figure 6 As shown in one embodiment of this application, the airflow generating device 100 further includes a third sealing structure 70, which is located between the motor assembly 20 and the air inlet 111. The third sealing structure 70 has a third receiving groove 71, and one end of the motor assembly 20 near the air inlet 111 is covered within the third receiving groove 71. The third sealing structure 70 seals the outer surface of the end position of the motor assembly 20 with the corresponding inner surface of the main housing 11, so that the airflow is concentrated through the motor assembly 20. At the same time, it prevents the airflow from flowing back to the air inlet 111 after passing through the motor assembly 20 and between the outer surface of the end position of the motor assembly 20 and the corresponding inner surface of the main housing 11, thereby reducing the loss of gas flow and enhancing the airflow force when the air is discharged.

[0067] Optionally, the third sealing structure 70 is an annular rotating component, and the third receiving groove 71 is a stepped groove that matches the shape of the end of the motor assembly 20, preventing the motor assembly 20 from swaying in all directions and moving towards the air inlet 111. An axially penetrating ventilation hole is provided on the third sealing structure 70, located at the bottom of the third receiving groove 71. After the first housing 101 and the second housing 102 are fastened together, the intermediate third sealing structure 70 is fixed, thereby fixing the end of the motor assembly 20 to the main housing 11.

[0068] like Figure 1 As shown, in one embodiment of this application, the airflow generating device 100 further includes a battery pack 80, which provides power to the motor assembly 20. By integrating the battery pack 80, no power cord is required, eliminating the limitation of plugging in and broadening the range of applicable work scenarios. Furthermore, the battery pack 80 is removable for easy charging or direct replacement.

[0069] like Figure 1 , Figure 6 As shown, the end of the main housing 11 is provided with a tail cover 13, and the air inlet 111 is opened on the tail cover 13. The tail cover 13 is installed at the end position after the first housing 101 and the second housing 102 are fastened together.

[0070] like Figure 6 As shown, a first filter 15 and a second filter 16 are provided between the air inlet 111 and the motor assembly 20, forming a two-stage filtration system for filtering dust from the outside air. A support frame 17 is installed inside the main housing 11, and the first filter 15 and the second filter 16 are located between the tail cover 13 and the support frame 17.

[0071] like Figure 6 As shown, the airflow generating device 100 also includes a nozzle 14, which is fitted onto the air outlet 121 of the air outlet housing 12. Users can replace the nozzles with different diameters according to different working conditions to provide different airflow force and wind speed.

[0072] like Figure 1 As shown, the airflow generating device 100 includes a grip 18, which is angled to the axis of the motor assembly 20. The grip 18 has a trigger for easy hand-held operation. A mounting portion for connecting a battery pack is located at the bottom of the grip 18, and the battery pack 80 is detachably mounted in this mounting portion. The power supply for the airflow generating device 100 is not limited to DC power; it can also be connected to AC power via a power cord connector located at the bottom of the handle.

[0073] The working process of the airflow generating device 100 provided in this application is as follows: after the motor assembly 20 is powered on, the motor drives the fan to rotate, driving the external air to enter through the air inlet 111 and flow along the air guide gap 112 formed between the motor assembly 20 and the main housing 11 to the air gathering chamber of the air outlet housing 12, and blow it out from the air outlet 121.

[0074] As the airflow flows from the main housing 11 to the outlet housing 12, the first sealing structure 30 prevents airflow loss. The airflow in the guide gap is gathered in the air-gathering chamber of the outlet housing 12 and then smoothly exits through the outlet 121, thereby reducing airflow loss and increasing wind force and speed. The outer side of the motor assembly 20 is a single-sided housing, which helps to reduce the radial dimension of the housing while maintaining wind force.

[0075] The two ends of the motor assembly 20 are fixed to the air outlet shell 12 and the main shell 11 respectively by the bracket 50 and the third sealing structure 70. The connection between the air outlet shell 12 and the main shell 11 is provided with a first sealing structure 30, and the docking point between the first shell 101 and the second shell 102 is provided with a second sealing structure 40. During airflow, the multiple sealing structures can ensure that the periphery of the receiving cavity is sealed, forming a large internal pressure. The airflow is discharged from the single air outlet 121, avoiding wind loss and improving the airflow force.

[0076] The air outlet housing 12 can be fitted with nozzles 14 of different exhaust port diameters (hereinafter referred to as "diameter"). Users can adjust the airflow force and speed by replacing the nozzles 14 with different diameters to suit different working scenarios. Typically, small-diameter nozzles 14 are used to clean hard-to-clean dust such as air conditioning filters and dust inside computer cases. Compared to large-diameter nozzles 14, the smaller diameter of the small-diameter nozzle creates greater internal pressure, resulting in faster airflow. Large-diameter nozzles are used for inflating vacuum objects or cleaning regular construction dust. Compared to small-diameter nozzles, the larger diameter of the large-diameter nozzle keeps the motor near its highest efficiency, resulting in stronger airflow.

[0077] Furthermore, the motor power can be changed, and users can further adjust the airflow force and speed at the exhaust port by adjusting the motor power and speed. In one embodiment, the airflow generating device 100 is equipped with a power adjustment button 90, which is operated by the user to set the motor power. The motor power can be set to four levels by pressing the power adjustment button 90. In a specific embodiment, the four power levels of the motor, from high to low, are 300W, 225W, 150W, and 75W.

[0078] As shown in Table 1, when the motor is driven at its maximum power of 300W, different nozzle diameters result in different maximum motor speeds, and consequently, different airflow forces and speeds from the airflow generating device. It can be roughly observed that as the nozzle diameter ranges from 8mm to 14mm, and the maximum motor speed ranges from 66,000 to 80,000 rpm, the airflow force from the exhaust port gradually increases. The maximum force is 2.82N at a nozzle diameter of 13.5mm. Beyond 13.5mm, the airflow force decreases. This is because at 13.5mm, the motor has its maximum intake power, reaching its highest efficiency point, resulting in maximum airflow. Beyond 13.5mm, the intake power is not at its maximum, so the airflow force is lower.

[0079] Furthermore, as the nozzle diameter gradually increases from 8mm to 14mm, the airflow velocity from the exhaust vent shows a significant decreasing trend; the smaller the diameter, the higher the airflow velocity, but also the greater the wind noise. Extensive experimental testing shows that when the nozzle diameter is less than 9mm, the entire unit generates noticeable wind noise. To avoid wind noise and thus affect the user experience, a nozzle diameter greater than 9mm is preferable. Specifically, when using a 9.5mm diameter nozzle, wind noise is reduced while achieving a high airflow velocity of 202 m / s.

[0080]

[0081] Table 1

[0082] In one embodiment of this application, the airflow generating device has two operating modes. When the airflow generating device is in the first mode, a nozzle 14 with an exhaust port diameter ranging from 13mm to 14mm is fitted onto the air outlet housing 12; when the airflow generating device is in the second mode, a nozzle 14 with an exhaust port diameter ranging from 9mm to 10mm is fitted onto the air outlet housing 12. In the first mode, the air force discharged from the exhaust port ranges from 2.3N to 3.5N; in the second mode, the air velocity discharged from the exhaust port ranges from 150 to 209m / s.

[0083] Optionally, in the first mode, the maximum motor speed ranges from 66,000 to 69,000 rpm, and the exhaust air force ranges from 2.7 to 2.9 N; in the second mode, the maximum motor speed ranges from 75,000 to 78,000 rpm, and the exhaust air speed ranges from 195 to 209 m / s. The motor speed, air force, and air speed figures here take into account the impact of motor deviations and wind losses on machine performance.

[0084] like Figure 5 , Figure 6As shown in one embodiment of this application, the air outlet shell 12 and the main shell 11 are designed separately. The first end 12a of the air outlet shell 12 has an air outlet, and the second end 12b of the air outlet shell 12 is connected to the main shell 11. The radial dimension of the air outlet shell 12 gradually shrinks from the second end 12b to the first end 12a to form a funnel-shaped air-gathering chamber inside the air outlet shell. The manufacturing of the air outlet shell 12 is free from process limitations, and the funnel-shaped air-gathering chamber inside it allows for smooth airflow. The main shell 11 includes a main body 19 for connecting with the air outlet shell 12 and accommodating the motor assembly 20, a gripping part 18 connected to the main body, and a battery pack mounting base 115 connected to the gripping part.

[0085] The main housing 11 includes a first housing 101 and a second housing 102. The first housing 101, the second housing 102 and the air outlet housing 12 together form a cavity for accommodating the motor assembly 20. This split design makes the motor assembly 20 easy to install and disassemble.

[0086] In one embodiment, the first housing 101 is configured as a first main body 101a, the second housing 102 is configured as a second main body 102a, the first main body 101a and the second main body 102a are joined to form a main body 19, and the main body 19 and the air outlet housing 12 together form a receiving cavity for accommodating the motor assembly 20.

[0087] In one embodiment, the first housing 101 includes an integrally formed first main body portion 101a and a first handle portion 101b, and the second housing 102 includes an integrally formed second main body portion 102a and a second handle portion 102b. The first main body portion 101a and the second main body portion 102a are mated to form a main body portion 19, and the first handle portion 101b and the second handle portion 102b are mated to form a grip portion 18. The main body portion 19 mates with the air outlet housing 12 to form a receiving cavity for accommodating the motor assembly 20, and the grip portion 18 is used for handheld operation by the user. The main body portion 19 and the grip portion 18 are designed as a single unit, eliminating the need for an additional housing structure for gripping, resulting in only a single-layer housing on the outside of the motor assembly and reducing the overall radial dimension of the device.

[0088] In one embodiment, the first housing 101 includes an integrally formed first main body portion 101a, a first handle portion 101b, and a first battery interface portion 101c. The second housing 102 includes an integrally formed second main body portion 102a, a second handle portion 102b, and a second battery interface portion 102c. The first main body portion 101a and the second main body portion 102a are mated to form a main body portion 19. The first handle portion 101b and the second handle portion 102b are mated to form a grip portion 18. The first battery interface portion 101c and the second battery interface portion 102c are mated to form a battery mounting base 115 for accommodating a battery pack 80. The battery mounting base 115 is integrally designed with the main body portion 19 and the grip portion 18, reducing the difficulty of housing assembly.

[0089] like Figures 7-9 As shown in one embodiment of this application, a positioning structure is provided between the second end 12b of the air outlet shell 12 and the main shell 11. This structure is used to prevent the air outlet shell from moving axially and / or rotating relative to the main shell when it is mated with the main shell. This is to avoid air leakage caused by uncertain axial installation positions of the air outlet shell and the main shell, such as stripped threads, which would affect wind force or wind speed.

[0090] In one embodiment, a first positioning part 124 is provided on the second end 12b of the air outlet shell 12, and a second positioning part 113 is provided on the main shell 11. When the air outlet shell 12 is mated with the main shell 11, the first positioning part 124 and the second positioning part 113 lock together, preventing not only axial movement of the air outlet shell 12 relative to the main shell 11, but also relative rotation. Compared with the prior art, which screws the main shell 11 and the air outlet shell 12 together, by providing a positioning structure between the air outlet shell 12 and the main shell 11, the assembly efficiency of the shell is improved, and the possibility of installation misalignment is reduced, thereby avoiding air leakage at the mating point of the main shell 11 and the air outlet shell 12, which would cause airflow loss.

[0091] Specifically, the first positioning part 124 on the air outlet housing 12 includes a protrusion protruding from the outer surface of the second end, and the second positioning part 113 includes a limiting groove disposed on the inner surface of the main housing 11. The limiting groove includes an axial wall 113a and a rotating wall 113b. When the air outlet housing 12 is engaged with the main housing 11, the protrusion of the first positioning part 124 is engaged in the limiting groove of the second positioning part 113, the axial wall 113a restricts the air outlet housing 12 from axially moving relative to the main housing 11, and the rotating wall 113b restricts the air outlet housing 12 from rotating relative to the main housing.

[0092] Optionally, the second end of the air outlet shell 12 is cylindrical and has two first positioning parts 124. The first housing 101 and the second housing 102 are joined together to form a cylindrical main housing 11. The inner surfaces of the first housing 101 and the second housing 102 are provided with second positioning parts 113, which are located at the joints at both ends of the first housing 101 and the second housing 102. When the air outlet shell 12 is fitted with the first housing 101 and the second housing 102, the two first positioning parts 124 on the air outlet shell 12 are located at the joints at both ends of the first housing 101 and the second housing 102, and are simultaneously locked with the second positioning parts 113 on the first housing 101 and the second housing 102.

[0093] In one embodiment, the motor assembly 20 is supported on the inner wall of the air outlet housing 12, and the projection of the motor assembly 20 and the air outlet housing 12 along the motor axis coincides, so that the installation of the motor assembly 20 makes full use of part of the internal space of the air outlet housing, reducing the axial dimension of the whole machine. At the same time, a shock-absorbing component is provided between the inner wall of the air outlet housing 12 and the motor assembly 20 to reduce the vibration transmission from the motor assembly 20 to the air outlet housing 12 and the main housing 11.

[0094] Specifically, the inner wall of the air outlet casing 12 is provided with a support portion 123 for holding the motor assembly 20. The end of the motor assembly 20 is supported by a bracket 50, and the bracket 50 is fixedly connected to the support portion 123. The shock absorber 60 is located between the bracket 50 and the motor assembly 20 to prevent vibration from being transmitted to the casing through the bracket 50.

[0095] Optionally, the inner wall of the air outlet casing 12 is provided with two support parts 123, which are symmetrical with respect to the motor axis and are fixedly connected to both ends of the bracket 50.

[0096] like Figure 7 , Figure 8 , Figure 10 As shown in one embodiment of this application, a first stop structure 125 is provided at the second end 12b of the air outlet shell 12, and a corresponding second stop structure 114 is provided on the main shell 11, so that the air outlet shell 12 and the main shell 11 are fitted together to form a labyrinth seal. At the same time, a first sealing structure 30 is provided between the air outlet shell 12 and the main shell 11. The stop structure and the first sealing structure 30 ensure a sealed connection between the air outlet shell 12 and the main shell 11, avoiding airflow loss at the connection point during the blowing process.

[0097] Optionally, the first stop structure 125 and the second stop structure 114 are provided with ribs and grooves. The ribs and grooves on the first stop structure 125 respectively engage with the grooves and ribs on the second stop structure 114 to form a multi-layer labyrinth seal. The first sealing structure 30 is a sealing ring. The first stop structure 125 is provided with an annular groove 122 to accommodate the sealing ring. The two ribs on the first stop structure 125 form the two groove walls of the annular groove 122.

[0098] like Figure 11 As shown, in one embodiment of this application, the motor assembly 20 defines a motor axis X and includes a fan 201 (motor and fan) that rotates around the motor axis. The fan 201 rotates to generate airflow. In addition, the motor assembly also includes a housing, and an air guide gap 112 is formed between the housing and the main housing 11. The airflow generated by the rotation of the fan 201 flows to the air gathering chamber through the air guide gap 112 to ensure smooth airflow.

[0099] The air guide gap 112 between the motor assembly 20 and the main housing 11 is there to ensure smooth airflow. If the air guide gap is too small, some airflow will be lost, resulting in a decrease in wind force and wind speed. Conversely, if the air guide gap is larger, the airflow will increase, but the increase will not be significant after reaching a certain level. In one embodiment, the radial dimension L1 of the main housing body is not greater than 80 mm, and the minimum distance L3 of the air guide gap 112 formed between the motor assembly 20 and the main housing 11 is not less than 5 mm.

[0100] Optionally, the radial dimension L1 of the main body of the main housing is not less than 75mm, the outer diameter L2 of the motor assembly 20 is not greater than 65mm, and the wall thickness of the main housing is between 2mm and 4mm.

[0101] In one specific embodiment, the minimum distance L3 of the air guide gap 112 between the outer diameter of the motor assembly 20 and the inner surface of the main housing 11 is 5 mm, the outer diameter L2 of the motor assembly 20 is 55 mm, the radial dimension L1 of the main housing body is 76 mm, and the wall thickness of the main housing 11 is 3.5 mm. The airflow generating device provided in this application has a small radial dimension of the motor assembly, resulting in a small air guide gap between the motor assembly and the main housing while ensuring air outlet performance. Furthermore, the outer side of the motor assembly has only a single-layer housing, which further reduces the radial dimension of the main housing and thus the overall radial dimension of the device.

[0102] In one embodiment, the motor assembly 20 includes a circuit board 202 disposed near the air outlet housing 12. The housing includes a first housing 203 disposed around the circuit board 202 and a second housing 204 disposed around the fan 201. An axial gap 205 is provided between the first housing 203 and the second housing 204, so that the airflow entering the motor assembly 20 flows into the air guide gap 112 through the axial gap 205, ensuring smooth air outlet and facilitating heat dissipation of the circuit board 202.

[0103] Specifically, the second housing 204 includes a first air vent 2041 and a second air vent 2042. The first air vent 2041 is located close to the fan 201. When the fan 201 rotates, the external airflow enters the main housing 11 through the air inlet 111, enters the motor assembly 20 through the first air vent 2041, and is discharged from the second air vent 2042. Then, it flows into the air guide gap 112 through the axial gap 205, and finally passes through the air gathering chamber and is blown out from the air outlet 121.

[0104] In one embodiment, a third sealing structure 70 is provided between the motor assembly 20 and the main housing 11. The third sealing structure 70 seals the gap between the outer periphery of the first air outlet 2041 and the inner wall of the main housing 11, so that when the fan rotates, the airflow is concentrated from the first air outlet 2041 into the motor assembly. At the same time, it prevents the airflow from flowing back to the air inlet 111 after being discharged from the second air outlet 2042 through the air guide gap 112, thereby reducing the loss of air volume during operation.

[0105] Optionally, the inner wall of the main housing 11 is provided with multiple annular ribs of different diameters, which abut against the outer surface of the third sealing structure 70 to achieve a multi-stage sealing effect and further improve the sealing performance.

[0106] In one embodiment of this application, the line connecting the centers of the air inlet 111 and the air outlet 121 of the airflow generating device 100 coincides with or is parallel to the motor axis X, so that the airflow is smooth and can quickly reach the air outlet 121 from the air inlet 111, avoiding the situation where the airflow path is too long or the path is not smooth, resulting in a weakening of the wind force.

[0107] In one embodiment of this application, the distance S1 between the air inlet 11 and the air outlet 121 is no greater than 160mm, the axial dimension S2 of the motor assembly 20 is no greater than 70mm, the distance S3 from the end of the motor assembly 20 near the air outlet housing to the air outlet 121 is no greater than 60mm, and the distance S4 from the end of the motor assembly 20 away from the air outlet housing to the air inlet 11 is no greater than 40mm. At the same time, the projection of the motor assembly 20 and the air outlet housing 12 in the direction of the motor axis coincides, so that the installation of the motor assembly 20 makes full use of part of the internal space of the air outlet housing and reduces the axial dimension of the whole machine.

[0108] In one embodiment, the bare weight of the airflow generating device is no more than 650g. The bare weight refers to the weight of the airflow generating device without accessories such as the battery pack and nozzles. The motor assembly 20 is integrated and lightweight. The outer side of the motor assembly consists of only a single-layer main housing. At the same time, the main housing has a partial degumming design without affecting the support, which makes the whole machine lightweight.

[0109] The airflow generating device 100 provided in this application is handheld and can be used in various work scenarios. In one embodiment, the user can attach a nozzle 14 to the air outlet shell 12 to blow away construction dust, etc.; in another embodiment, the user can install an air extraction accessory near the air inlet 111 for extracting air from air cushions or swimming rings.

[0110] It should be noted that "a certain body" or "a certain part" can be a portion of the corresponding "component," meaning that "a certain body" or "a certain part" is integrally formed and manufactured with the "other parts of the component"; or it can be an independent component that can be separated from the "other parts of the component," meaning that "a certain body" or "a certain part" can be manufactured independently and then combined with the "other parts of the component" to form a whole. The expression of "a certain body" or "a certain part" in this application is only one embodiment for ease of reading, and is not intended to limit the scope of protection of this application. Any technical solution that includes the above features and has the same function should be understood as an equivalent technical solution of this application.

[0111] It should be noted that some embodiments of this application have been described above. Other embodiments are within the scope of the appended claims.

[0112] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; this manner of description is merely for clarity, and those skilled in the art should consider the specification as a whole. Within the framework of this application, the technical features of the above embodiments or different embodiments can also be appropriately combined, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0113] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. An airflow generating device, characterized in that, include: Main housing, the main housing having an air inlet; The air outlet shell is designed separately from the main shell and together with the main shell forms a receiving cavity; the first end of the air outlet shell has an air outlet, the second end of the air outlet shell is connected to the main shell, and the radial dimension of the air outlet shell gradually shrinks from the second end to the first end so that a funnel-shaped air gathering chamber is formed inside the air outlet shell; A motor assembly is disposed in the receiving cavity. The motor assembly defines a motor axis and includes a motor and a fan that rotate around the motor axis. When the motor rotates, external airflow enters the main housing through the air inlet, passes through the air gathering chamber, and is discharged from the air outlet. Several air nozzles may be selectively installed at the first end of the air outlet housing; when the air nozzles are installed in the air outlet housing, the maximum speed range of the motor is 66,000 to 80,000 rpm; the air nozzles are provided with exhaust ports, wherein the exhaust port diameter of the first air nozzle is 13 to 14 mm, and the exhaust port diameter of the second air nozzle is 9 to 10 mm. The airflow generating device is defined as operating in a first mode when equipped with a first air nozzle and operating in a second mode when equipped with a second air nozzle. In the first mode, the air force discharged from the exhaust port ranges from 2.3 to 3.5 N. In the second mode, the air velocity discharged from the exhaust port ranges from 150 to 209 m / s. The main housing includes a main body portion that accommodates the motor assembly, and the radial dimension of the main body portion is not greater than 80 mm.

2. The airflow generating device according to claim 1, characterized in that, In the first mode, the maximum speed range of the motor is 66,000 to 69,000 rpm, and the air force discharged from the exhaust port is 2.7 to 2.9 N. In the second mode, the maximum speed range of the motor is 75,000 to 78,000 rpm, and the air speed discharged from the exhaust port is 195 to 209 m / s.

3. The airflow generating device according to claim 1, characterized in that, An air guide gap is formed between the motor assembly and the main housing, and the air guide gap is in communication with the airflow of the air gathering chamber. The minimum distance of the air guide gap is not less than 5mm.

4. The airflow generating device according to claim 1, characterized in that, The radial dimension of the motor assembly is not greater than 65mm, and the radial dimension of the main body is not less than 76mm.

5. The airflow generating device according to claim 1, characterized in that, The distance between the air inlet and the air outlet shall not exceed 160mm.

6. The airflow generating device according to claim 1, characterized in that, The axial dimension of the motor assembly is no greater than 70mm, and the distance from the end of the motor assembly near the air outlet shell to the air outlet is no greater than 60mm.

7. The airflow generating device according to claim 1, characterized in that, The distance from the end of the motor assembly furthest from the air outlet to the air inlet is no more than 40mm.

8. The airflow generating device according to claim 1, characterized in that, The bare weight of the airflow generating device is no more than 650g.

9. The airflow generating device according to claim 1, characterized in that, The wall thickness of the main housing is 2-4 mm.

10. The airflow generating device according to claim 1, characterized in that, The motor assembly is at least partially supported on the inner wall of the air outlet housing, and the projection of the motor assembly and the air outlet housing in the direction of the motor axis coincides; the airflow discharged from the air outlet is used for dust removal.

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