Airflow generating device

Abstract

The utility model provides an airflow generating device which comprises a machine shell and a fan, the machine shell comprises a main shell body and an air outlet shell, the air outlet shell is installed on the main shell body to define a containing cavity, the main shell body is provided with an air inlet, and the air outlet shell is provided with an air outlet and an air gathering chamber; the first sealing structure is located between the air outlet shell and the main shell; and the motor assembly is located in the containing cavity, an air guide gap is formed between the motor assembly and the main shell, the air guide gap communicates with the air gathering chamber, and the motor assembly drives air to enter the air guide gap from the air inlet and flow to the air outlet after passing through the air gathering chamber. Through the arrangement, the airflow generating device ensures smooth air outlet, reduces the air volume loss and improves the air outlet efficiency; the whole machine is small in size, low in cost and convenient to store and carry.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric tools, and particularly relates to an airflow generating device. BACKGROUND

[0002] At present, airflow generating devices, such as dust blowing guns, are mainly used to provide large wind power or wind speed to efficiently clean dust on the surface of a construction area.

[0003] In the existing airflow generating device, on the one hand, the air outlet of the shell is not smooth enough, or the sealing performance is not good enough to affect the wind power or wind speed; on the other hand, the outer side of the motor assembly is covered by a double-shell formed by a main shell and an outer shell, which is inconvenient to install and has a large size, and is inconvenient to store. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the application aims to provide an airflow generating device with smooth air outlet and easy assembly.

[0005] In order to achieve the above-mentioned purpose, the application provides an airflow generating device, which comprises:

[0006] a main shell, the main shell comprising a first shell and a second shell, and the main shell having an air inlet;

[0007] an air outlet shell, which is designed separately from the main shell and encloses the first shell and the second shell to form a containing cavity; the first end of the air outlet shell has an air outlet, the second end of the air outlet shell is connected with the main shell, and the radial dimension of the air outlet shell gradually shrinks from the second end to the first end to form a funnel-shaped air gathering chamber in the air outlet shell;

[0008] a motor assembly arranged in the containing cavity, the motor assembly defining a motor axis and comprising a fan rotating around the motor axis;

[0009] When the fan rotates, external airflow enters the main shell through the air inlet, passes through the air gathering chamber, and is blown out from the air outlet.

[0010] As a further improvement of an embodiment of the application, the second end of the air outlet shell and the main shell are correspondingly provided with positioning structures to prevent the air outlet shell from moving axially and / or rotating relative to the main shell when the air outlet shell is connected with the main shell; the positioning structures comprise a first positioning part arranged on the air outlet shell and a second positioning part arranged on the main shell, and the first positioning part and the second positioning part are configured to be locked with each other in shape.

[0011] As a further improvement of an embodiment of the application, the second end of the air outlet shell and the main shell are correspondingly provided with a stop structure to form a labyrinth seal when the air outlet shell is connected with the main shell.

[0012] As a further improvement of an embodiment of the application, a first sealing structure is arranged between the air outlet shell and the main shell, and a second sealing structure is arranged between the first shell and the second shell.

[0013] As a further improvement of an embodiment of the application, the motor assembly is supported on an inner wall of the air outlet shell, a projection of the motor assembly and the air outlet shell in the direction of the motor axis coincides, and a damping member is arranged between the inner wall of the air outlet shell and the motor assembly.

[0014] As a further improvement of an embodiment of the application, the motor assembly comprises a cover shell, an air guide gap is formed between the cover shell and the main shell, and the air guide gap is in airflow communication with the air gathering chamber.

[0015] As a further improvement of an embodiment of the application, the motor assembly comprises a circuit board arranged close to the air outlet shell, the cover shell comprises a first cover shell arranged around the circuit board and a second cover shell arranged around the fan, an axial gap is arranged between the first cover shell and the second cover shell, and the axial gap is in airflow communication with the air guide gap.

[0016] As a further improvement of an embodiment of the application, the second cover shell comprises a first air port arranged close to the fan, airflow generated by rotation of the fan enters the interior of the motor assembly through the first air port and enters the air guide gap from the axial gap, a third sealing structure is arranged between the motor assembly and the main shell, and the third sealing structure is configured to seal a gap between the outer periphery of the first air port and the inner wall of the main shell, so that airflow is concentrated to enter the interior of the motor assembly from the first air port, while avoiding backflow of airflow to the air inlet through the air guide gap.

[0017] As a further improvement of an embodiment of the application, the first shell comprises a first main body portion and a first handle portion, the second shell comprises a second main body portion and a second handle portion, the first main body portion and the second main body portion are butted to form a main body portion, and the first handle portion and the second handle portion are butted to form a grip portion; a line connecting the centers of the air inlet and the air outlet coincides with or is parallel to the motor axis; and the airflow generating device is used to blow away dust.

[0018] The application also provides an airflow generating device, comprising:

[0019] A shell, comprising a main shell, an air outlet shell connected to the main shell, and the air outlet shell and the main shell enclosing a containing cavity;

[0020] A motor assembly located in the containing cavity;

[0021] The battery pack provides power to the motor assembly;

[0022] The main housing is characterized by having an air inlet, and the air outlet housing is characterized by having an air outlet;

[0023] The first sealing structure is located between the air outlet shell and the main shell;

[0024] An air guide gap is formed between the motor assembly and the main housing, and the air outlet housing is provided with an air gathering chamber communicating with the air guide gap; the rotation driven by the motor assembly enables external air to enter the air guide gap from the air inlet, flow to the air outlet after passing through the air gathering chamber; the airflow generating device is used to blow away dust.

[0025] 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 contains a funnel-shaped air-gathering chamber to ensure smooth airflow. A stop structure and a sealing structure are provided between the air outlet shell and the main shell to prevent airflow loss and improve airflow efficiency. The main shell is formed by the docking of the first and second shells. The main shell and the air outlet shell together form a cavity for housing the motor assembly. This separate design facilitates the installation and disassembly of the motor assembly. The main shell includes a main body and a gripping part, which are designed as a single unit, eliminating the need for a separate gripping shell structure. This results in only a single-layer shell on the outside of the motor assembly, reducing the overall radial dimension of the device. 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. A positioning structure between the air outlet shell and the main shell reduces the possibility of installation misalignment, making installation easier and improving the assembly efficiency of the shell.

[0026] In summary, the airflow generating device provided in this application has smooth airflow, strong airflow, is easy to assemble, and has a small overall size, making it convenient to store and carry. Attached Figure Description

[0027] Figure 1 This is a cross-sectional structural schematic diagram of an airflow generating device in one embodiment of this application.

[0028] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at point AA;

[0029] Figure 3 This is a rear view of the airflow generating device;

[0030] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure at point BB;

[0031] Figure 5 This is a three-dimensional structural diagram of the airflow generating device in another embodiment;

[0032] Figure 6 Explanatory diagram of the main structure of the airflow generating device in another embodiment;

[0033] Figure 7 Explanatory diagram of the main structure of the airflow generating device in another embodiment; Figure 6 Explanatory diagram of the main structure of the airflow generating device in another embodiment;

[0034] Figure 8 Explanatory diagram of the main structure of the airflow generating device in another embodiment; Figure 6 Explanatory diagram of the main structure of the airflow generating device in another embodiment;

[0035] Figure 9 Explanatory diagram of the main structure of the airflow generating device in another embodiment; Figure 1 Explanatory diagram of the main structure of the airflow generating device in another embodiment;

[0036] Figure 10 Explanatory diagram of the main structure of the airflow generating device in another embodiment; Figure 4 Explanatory diagram of the main structure of the airflow generating device in another embodiment;

[0037] Figure 11 Explanatory diagram of the main structure of the airflow generating device in another embodiment;

[0038] Reference signs:

[0039] 100, airflow generating device;

[0040] 10, housing; 101, first housing; 101a, first main body part; 101b, first handle part; 101c, first battery interface part; 102, second housing; 102a, second main body part; 102b, second handle part; 102c, second battery interface part; 11, main housing; 111, air inlet; 112, air guide gap; 113, second positioning part; 113a, axial wall; 113b, rotation wall; 114, second stop structure; 12, air outlet housing; 12a, first end of air outlet housing; 12b, second end of air outlet housing; 121, air outlet; 122, annular groove; 123, support part; 124, first positioning part; 125, first stop structure; 13, tail cover; 14, air nozzle; 141, air outlet; 15, first filter screen; 16, second filter screen; 17, support frame; 18, grip part; 19, main body part; 115, battery mounting seat

[0041] 20, motor assembly; 201, fan; 202, circuit board; 203, first cover; 204, second cover; 2041, first air inlet; 2042, second air inlet; 205, axial gap; X: motor axis

[0042] 30, first sealing structure;

[0043] 40, second sealing structure;

[0044] 50, support; 51, first accommodating groove;

[0045] 60, damping member; 61, second accommodating groove;

[0046] 70, third sealing structure; 71, third accommodating groove;

[0047] 80, battery pack. DETAILED DESCRIPTION

[0048] The application will be described in detail below with reference to specific embodiments shown in the drawings. However, these embodiments do not limit the application, and the changes made to the structure, method, or function by those of ordinary skill in the art based on these embodiments are included in the protection scope of the application.

[0049] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the application should be understood as the usual meaning understood by those of ordinary skill in the art to which the embodiments belong. The terms "first", "second", and similar terms used in the embodiments of the application do not represent any order, quantity, or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar terms mean that the elements or objects listed before the terms cover the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connected" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "up", "down", "left", "right", and the like are only used to represent relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0050] Currently, in the air flow generating device, for example, a dust blowing gun usually includes a casing and a motor assembly accommodated in the casing, and the casing has an air inlet and an air outlet. Among them, the motor assembly adopts a fan and motor integrated assembly, and the motor can be a high-speed brushless motor. Such motor assembly is widely used in the dust collector industry. The motor drives the fan to rotate, so that the external air enters the air inlet of the casing and is blown out of the air outlet. The greater the wind power and wind speed, the higher the efficiency.

[0051] Among them, the air outlet is usually located at the necked end of the casing. Due to the manufacturing process, there are many rib positions at the air outlet, which makes the air duct not smooth enough, resulting in wind power attenuation. In addition, the motor assembly is wrapped with a main shell, and the outer side of the main shell is wrapped with an outer casing, so that the outer side of the motor assembly has a double-layer shell, forming two layers of wall thickness, resulting in a large size of the whole machine, a large volume, and inconvenience for storage.

[0052] In addition, the type of air flow generating device is not limited to dust blowing gun, for example, it can also be other shapes such as linear dust blower, hair dryer or air blower, etc.

[0053] Based on this, the application provides an air flow generating device to solve the above technical problems. See the following embodiments.

[0054] With reference to Figures 1 to 6 , the air flow generating device 100 provided by an embodiment of the application includes a casing 10, a motor assembly 20, and a first sealing structure 30. The casing 10 includes a main shell 11 and an air outlet shell 12. The air outlet shell 12 is installed on the main shell 11 to form an accommodating cavity. The main shell 11 has an air inlet 111, and the air outlet shell 12 has an air outlet 121 and a wind gathering chamber. The wind gathering chamber is formed by the inner wall of the air outlet shell 12, and the inner wall of the air outlet shell 12 is smooth. The first sealing structure 30 is located between the air outlet shell 12 and the main shell 11. The motor assembly 20 is located in the accommodating cavity of the casing 10. The motor assembly 20 and the main shell 11 form an air guide gap 112. The motor assembly 20 is used to drive external air to enter the air guide gap 112 from the air inlet 111, and the external air flows to the air outlet 121 after being gathered by the wind gathering chamber.

[0055] In the air flow generating device 100, the motor assembly 20 is accommodated in the accommodating cavity formed by the main shell 11 and the air outlet shell 12. On the one hand, the motor assembly 20 and the main shell 11 leave an air guide gap, which ensures smooth air flow. The first sealing structure 30 ensures the sealing connection between the air outlet shell 12 and the main shell 11, avoids air flow loss at the connection during the blowing process, and improves the air outlet efficiency by smooth air outlet of the air flow from the wind gathering chamber of the air outlet shell 12. On the other hand, the motor assembly 20 has only a single layer of shell on the outside, which reduces the radial size of the casing.

[0056] Further, the motor assembly 20 includes a motor and a fan, which are integrated as a whole. The fan is located on the side of the motor close to the air inlet 111. The motor drives the fan to rotate, and the generated air flow passes through the periphery of the motor.

[0057] Further, the air outlet shell 12 is an integrated rotary structure, specifically a funnel-shaped shell with one large end and one small end. The inner wall of the air outlet shell 12 is in a smooth streamline shape, and the air outlet 121 is located at the small end of the air outlet shell 12.

[0058] As Figure 2 , Figure 3 , Figure 5 , Figure 6As shown in the drawings, in an embodiment of the present application, the main shell 11 comprises a first shell 101 and a second shell 102, the main shell 11 is formed by the butt joint of the first shell 101 and the second shell 102, and a second sealing structure 40 is arranged between the first shell 101 and the second shell 102. The main shell 11 is formed by the butt joint of the first shell 101 and the second shell 102, and the split structure facilitates the installation and disassembly of the motor assembly 20. The butt joint of the first shell 101 and the second shell 102 is sealed by the second sealing structure 40, so as to avoid the airflow from flowing out from the butt joint gap of the first shell 101 and the second shell 102 during the blowing process.

[0059] Optionally, the second sealing structure 40 is a strip-shaped gasket structure, which is clamped between the butt joint surfaces of the first shell 101 and the second shell 102.

[0060] As shown in the drawings, Figure 1 , Figure 2 , Figure 6 In an embodiment of the present application, the airflow generating device 100 further comprises a bracket 50, and the motor assembly 20 is connected with the air outlet shell 12 through the bracket 50. The bracket 50 is used to support the end portion of the motor assembly 20, and at the same time of fixing the end portion of the motor assembly 20, the internal space of the air outlet shell 12 is fully utilized, and the axial size of the whole machine is reduced.

[0061] In the embodiment, the bracket 50 is fixedly installed on the inner wall of the air outlet shell 12, a ventilation opening for airflow passing through is left between the bracket 50 and the inner wall of the air outlet shell 12, and the end portion of the motor assembly 20 is supported and fixed by the bracket 50 located in the air outlet shell 12.

[0062] As shown in the drawings, Figure 1 , Figure 2 , Figure 6 In an embodiment of the present application, the airflow generating device 100 further comprises a damping member 60, and the damping member 60 is located between the bracket 50 and the motor assembly 20. The motor assembly 20 will vibrate when working, and in the embodiment, the damping member 60 is arranged between the bracket 50 and the motor assembly 20, so as to dampen the vibration when the motor assembly 20 works, avoid the vibration being conducted to the machine shell through the bracket 50, and thus affect the use.

[0063] As shown in the drawings, Figure 6 In an embodiment, the bracket 50 has a first accommodating groove 51 matched with the shape of the damping member 60, and the damping member 60 is located in the first accommodating groove 51. The damping member 60 is fixed by the first accommodating groove 51 matched with the shape of the damping member 60, so as to avoid the damping member 60 from deviating under the vibration of the motor assembly 20, and thus affect the damping effect.

[0064] Further, the shock-absorbing member 60 and the first accommodating groove 51 are both square in cross section perpendicular to the axial direction. In other embodiments, the cross section of the shock-absorbing member 60 and the first accommodating groove 51 can also be polygonal, circular, or other irregular shapes.

[0065] In one embodiment, the shock-absorbing member 60 has a second accommodating groove 61, and the end portion of the motor assembly 20 near the air outlet 121 is covered in the second accommodating groove 61. The end portion of the motor assembly 20 is fixed by the second accommodating groove 61 on the shock-absorbing member 60, which can absorb a portion of the vibration energy when the motor assembly 20 is working. Optionally, the second accommodating groove 61 is square in shape corresponding to the shape of the shock-absorbing member 60, and the end portion of the motor assembly 20 has a square protrusion that fits the second accommodating groove 61, which serves to stop rotation of the motor assembly 20 when working.

[0066] Specifically, the end portion of the motor assembly 20 is embedded in the interior of the shock-absorbing member 60, and the shock-absorbing member 60 is embedded in the interior of the support 50. This nested structure can limit the end portion of the motor assembly 20 in multiple directions, including circumferential and axial directions, and can avoid large vibrations of the entire machine caused by the motor assembly 20 by providing the shock-absorbing member 60.

[0067] In one embodiment of the application, the first sealing structure 30 includes a sealing ring, and the end portion of the air outlet shell 12 is provided with an annular groove 122 that accommodates the sealing ring. The sealing ring is pressed in the annular groove 122, which can ensure the air tightness of the connection between the air outlet shell 12 and the main shell 11, effectively preventing air leakage at the connection. Optionally, the end portion of the air outlet shell 12 that extends into the interior of the main shell 11 is provided with two annular ribs that form two groove walls of the annular groove 122, and the groove opening of the annular groove 122 faces the inner surface of the main shell 11.

[0068] Alternatively, the annular groove 122 that accommodates the first sealing structure 30 can also be provided on the main shell 11, and correspondingly, the groove opening of the annular groove 122 faces the outer surface of the end portion of the air outlet shell 12.

[0069] As Figure 1 , Figure 4 , Figure 6As shown, in an embodiment of the present application, the airflow generating device 100 further comprises 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 accommodating groove 71, and an end of the motor assembly 20 close to the air inlet 111 is covered in the third accommodating groove 71. The third sealing structure 70 seals the outer surface of the end position of the motor assembly 20 and the inner surface of the corresponding position of the main shell 11, so that the airflow concentrates through the motor assembly 20, and at the same time, avoids the airflow flowing back to the air inlet 111 through the outer surface of the end position of the motor assembly 20 and the inner surface of the corresponding position of the main shell 11 after passing through the motor assembly 20, reduces the loss when the gas flows, and enhances the wind power when the air is discharged.

[0070] Optionally, the third sealing structure 70 is an annular rotary member, and the third accommodating groove 71 is a stepped groove matched with the shape of the end of the motor assembly 20, which can prevent the motor assembly 20 from shaking to the four directions and moving to the direction of the air inlet 111. An axial through ventilation hole is formed in the third sealing structure 70, which is located at the groove bottom position of the third accommodating groove 71. After the first shell 101 and the second shell 102 are buckled, the third sealing structure 70 in the middle is fixed, so that the end of the motor assembly 20 is fixed to the main shell 11.

[0071] As shown, Figure 1 In an embodiment of the present application, the airflow generating device 100 further comprises a battery pack 80, which provides power for the motor assembly 20. By using the battery pack 80, there is no need to use a power cord, and the application scenarios are wider without being limited by plugging in. Further, the battery pack 80 is detachable for charging or directly replacing the battery pack.

[0072] As shown, Figure 1 , Figure 6 As shown, the end of the main shell 11 is provided with a tail cover 13, and the air inlet 111 is formed on the tail cover 13. The tail cover 13 is installed at the end position after the first shell 101 and the second shell 102 are buckled.

[0073] As shown, Figure 6 Between the air inlet 111 and the motor assembly 20, a first filter screen 15 and a second filter screen 16 are arranged to form two-stage filtration for filtering dust in external air. A support frame 17 is installed in the main shell 11, and the first filter screen 15 and the second filter screen 16 are located between the tail cover 13 and the support frame 17.

[0074] As shown, Figure 6 The airflow generating device 100 further comprises a nozzle 14, which is sleeved at the air outlet 121 of the air outlet shell 12. Users can replace nozzles with different diameters according to different working conditions to provide different air discharge power and speed.

[0075] AsFigure 1 As shown, the airflow generating device 100 comprises a holding portion 18, which is arranged at an angle with respect to the axis of the motor assembly 20, and a trigger is arranged on the holding portion 18 to facilitate the user to hold and operate. The battery pack 80 is detachably mounted on the bottom of the holding portion 18.

[0076] The working process of the airflow generating device 100 provided in the present application is as follows. After the motor assembly 20 is powered on, the motor drives the fan to rotate, and drives the external air to enter the air inlet 111 and flow along the air guide gap 112 formed between the motor assembly 20 and the main shell 11 to the air gathering chamber of the air outlet shell 12, and is blown out from the air outlet 121.

[0077] The airflow flowing from the main shell 11 to the air outlet shell 12 is prevented from being lost by the first sealing structure 30. After the airflow in the air guide gap is gathered by the air gathering chamber of the air outlet shell 12, the airflow is smoothly blown out from the air outlet 121, thereby reducing the loss of air volume and improving the wind power and wind speed. The outer side of the motor assembly 20 is a single-sided shell, which helps to reduce the radial size of the shell while maintaining the wind power.

[0078] The two ends of the motor assembly 20 are fixed in the air outlet shell 12 and the main shell 11 through the support 50 and the third sealing structure 70, respectively. The connection between the air outlet shell 12 and the main shell 11 is provided with the first sealing structure 30, and the abutting portion between the first shell 101 and the second shell 102 is provided with the second sealing structure 40. During the airflow flowing process, the multiple sealing structures can ensure that the periphery of the containing cavity is airtight, form a larger internal pressure, and the airflow is discharged from the only air outlet 121, thereby avoiding wind loss and improving the air outlet wind power.

[0079] The air outlet shell 12 can be sleeved with air nozzles 14 of different diameters, and the air outlet wind power and wind speed can be adjusted by the size of the air nozzle diameter. Generally, small-diameter air nozzles are applied to clean dusts that are difficult to clean, such as air conditioner filter elements and dusts in computer cases, because the small-diameter air nozzles have a faster air outlet speed than large-diameter air nozzles. Large-diameter air nozzles are applied to inflate vacuum objects or clean dusts in regular decoration, because the large-diameter air nozzles have a larger air outlet wind power than small-diameter air nozzles. The airflow generating device 100 has multiple sealing structures, which can ensure the airtightness of the containing cavity, and the design of the air gathering chamber makes the air outlet more smooth, so that the gas is concentrated to flow through the air nozzles from the air outlet shell 12, thereby providing better air outlet performance.

[0080] In one specific embodiment, the motor speed of the airflow generating device 100 is set with different adjustable levels. The higher the level, the higher the motor speed, corresponding to different motor speeds. Users can choose different levels according to their needs. When the highest level is selected, without the nozzle, the motor speed ranges from 64,000 rpm to 72,000 rpm. When a 13.5mm diameter nozzle is attached, the motor speed remains essentially unchanged. At this time, the airflow force from the nozzle is 2.8N, the wind speed is 155 m / s, and the dynamic pressure is 13.9 kPa. When a slightly smaller 9.5mm diameter nozzle is attached, the motor speed ranges from 66,000 rpm to 75,000 rpm, a slight increase. At this time, the airflow force from the nozzle is 2.4N, the wind speed is 202 m / s, and the dynamic pressure is 23.7 kPa. With the same motor speed, different diameter nozzles can be fitted. Larger diameter nozzles produce stronger airflow, while smaller diameter nozzles produce faster airflow, thus meeting the needs of different usage scenarios.

[0081] The air guide gap 112 between the motor assembly 20 and the main housing 11 is designed to ensure smooth airflow. If the air guide gap is too small, some airflow will be lost, resulting in reduced wind force and speed. Conversely, a larger air guide gap will increase the airflow, but this increase will become less significant after reaching a certain level. In one specific embodiment, the width 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 approximately 5 mm. The outer diameter of the motor assembly 20 is 55 mm, and the outer diameter of the main housing 11 is 76 mm; the difference between the two includes the width of the air guide gap 112 and the wall thickness of the main housing 11.

[0082] like Figure 5 , Figure 6 As shown, in one embodiment of this application, the air outlet shell 12 and the main shell 11 are designed as separate units. 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 tapers 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 freed from process limitations, and the funnel-shaped air-gathering chamber inside ensures smooth airflow. The main shell 11 includes a main body 19 for engaging with the air outlet shell 12, a gripping part 18 connected to the main body, and a battery pack mounting part 115 connected to the gripping part.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] In one embodiment, a first positioning part 124 is arranged on the second end 12b of the air outlet shell 12, and a second positioning part 113 is arranged on the main shell 11. When the air outlet shell 12 is connected with the main shell 11, the first positioning part 124 and the second positioning part 113 are locked with each other, which not only prevents the air outlet shell 12 from moving axially relative to the main shell 11, but also prevents the two from rotating relative to each other. In the prior art, the main shell 11 and the air outlet shell 12 are screwed together. By arranging the 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 connection between the main shell 11 and the air outlet shell 12, which causes air flow loss.

[0089] Specifically, the first positioning part 124 on the air outlet shell 12 includes a protrusion protruding from the outer surface of the second end, and the second positioning part 113 includes a limiting groove arranged on the inner surface of the main shell 11. The limiting groove includes an axial wall 113a and a rotating wall 113b. When the air outlet shell 12 is connected with the main shell 11, the protrusion of the first positioning part 124 is clamped in the limiting groove of the second positioning part 113, and the axial wall 113a limits the air outlet shell 12 from moving axially relative to the main shell 11, and the rotating wall 113b limits the air outlet shell 12 from rotating relative to the main shell.

[0090] Alternatively, the second end of the air outlet shell 12 is cylindrical, and two first positioning parts 124 are arranged thereon; the first shell 101 and the second shell 102 are butt-jointed to form the cylindrical main shell 11, and the inner surfaces of the first shell 101 and the second shell 102 are provided with the second positioning parts 113 at the butt joints located at the two ends of the first shell 101 and the second shell 102; when the air outlet shell 12 is connected with the first shell 101 and the second shell 102, the two first positioning parts 124 on the air outlet shell 12 are located at the butt joints of the first shell 101 and the second shell 102 at the two ends, respectively, and are locked with the second positioning parts 113 on the first shell 101 and the second shell 102 at the same time.

[0091] In one embodiment, the motor assembly 20 is supported on the inner wall of the air outlet shell 12, and the projection of the motor assembly 20 and the air outlet shell 12 in the direction of the motor axis coincides, so that the installation of the motor assembly 20 fully utilizes part of the internal space of the air outlet shell, and the axial size of the whole machine is reduced. At the same time, a damping member is arranged between the inner wall of the air outlet shell 12 and the motor assembly 20, which reduces the transmission of vibration of the motor assembly 20 to the air outlet shell 12 and the main shell 11.

[0092] Specifically, the inner wall of the air outlet shell 12 is provided with a support part 123 for holding the motor assembly 20, and the end of the motor assembly 20 is supported by a bracket 50 which is fixedly connected with the support part 123. The damping member 60 is located between the bracket 50 and the motor assembly 20, so as to avoid the transmission of vibration to the shell through the bracket 50.

[0093] Optionally, the inner wall of the air outlet shell 12 is provided with two support portions 123 which are symmetrical relative to the motor axis and are fixedly connected with the two ends of the support 50.

[0094] As shown in Figure 7 , Figure 8 , Figure 10 In an embodiment of the present application, the second end 12b of the air outlet shell 12 is provided with a first stop structure 125, and the main shell 11 is correspondingly provided with a second stop structure 114, so that the air outlet shell 12 and the main shell 11 are connected to form a labyrinth seal, and a first sealing structure 30 is arranged between the air outlet shell 12 and the main shell 11. The stop structure and the first sealing structure 30 ensure the sealed connection between the air outlet shell 12 and the main shell 11, avoiding air flow loss at the connection during blowing.

[0095] Optionally, the first stop structure 125 and the second stop structure 114 are provided with ribs and notches, the ribs and notches on the first stop structure 125 are respectively engaged with the notches and ribs on the second stop structure 11 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 for accommodating the sealing ring, and the two ribs on the first stop structure 125 form two groove walls of the annular groove 122.

[0096] As shown in Figure 11 In an embodiment of the present application, the motor assembly 20 defines a motor axis X and includes a fan 201 rotating around the motor axis, and the fan 201 rotates to generate air flow; in addition, the motor assembly further includes a cover shell, and a guide air gap 112 is formed between the cover shell and the main shell 11, so that the air flow generated by the rotation of the fan 201 flows to the air collecting chamber through the guide air gap 112, ensuring smooth air flow.

[0097] In an embodiment, the motor assembly 20 includes a circuit board 202 arranged close to the air outlet shell 12, the cover shell includes a first cover shell 203 arranged around the circuit board 202 and a second cover shell 204 arranged around the fan 201, and an axial gap 205 is arranged between the first cover shell 203 and the second cover shell 204, so that the air flow entering the inside of the motor assembly 20 flows into the guide air gap 112 through the axial gap 205, ensuring smooth air outlet duct, and helping to dissipate heat of the circuit board 202.

[0098] Specifically, the second cover shell 204 includes a first air port 2041 and a second air port 2042, and the first air port 2041 is arranged close to the fan 201; when the fan 201 rotates, the external air flow enters the main shell 11 through the air inlet 111, enters the inside of the motor assembly 20 through the first air port 2041, and is discharged from the second air port 2042, then flows into the guide air gap 112 through the axial gap 205, and finally is blown out from the air outlet 121 after passing through the air collecting chamber.

[0099] In one embodiment, a third sealing structure 70 is arranged between the motor assembly 20 and the main shell 11, which seals the gap between the outer periphery of the first air outlet 2041 and the inner wall of the main shell 11, so that the air flow is concentrated into the motor assembly from the first air outlet 2041 when the fan rotates, and at the same time, the air flow is prevented from flowing back to the air inlet 111 through the air guide gap 112 after being discharged from the second air outlet 2042, thereby reducing the loss of air volume during operation.

[0100] Optionally, the inner wall of the main shell 11 is provided with a plurality of annular ribs with different diameters, which abut against the outer surface of the third sealing structure 70 to achieve a multi-segment sealing effect and further improve the sealing performance.

[0101] In one embodiment of the present application, the center line of the air inlet 111 and the air outlet 121 of the air flow generating device 100 coincides with or is parallel to the motor axis X, so that the air flow can flow smoothly from the air inlet 111 to the air outlet 121, avoiding the situation that the air flow path is too long and the air flow is not smooth, resulting in a decrease in wind power.

[0102] The air flow generating device 100 provided by the present application is operated by the user and is suitable for different working scenarios. In one embodiment, the user can put the air nozzle 14 on the air outlet shell 12 to blow away the decoration dust, etc. In another embodiment, the user can install a suction accessory near the air inlet 111 for air suction of air cushions and swimming rings.

[0103] It should be noted that "a certain body" or "a certain part" can be a part of a "member", that is, "a certain body" or "a certain part" is integrally manufactured with other parts of the "member"; or it can be a separate member that can be separated from other parts of the "member", that is, "a certain body" or "a certain part" can be independently manufactured and then combined with other parts of the "member" to form a whole. The expression of "a certain body" or "a certain part" in the present application is only one embodiment, for the convenience of reading, and is not a limitation on the scope of protection of the present application. As long as the above-mentioned features are included and the same effect is achieved, it should be understood as an equivalent technical solution of the present application.

[0104] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims.

[0105] Those skilled in the art should understand that the above discussion of any embodiment is only intended to be illustrative and is not intended to be in any way limiting to the scope of the present application, including the claims that follow this description. The description of the application is merely exemplary in nature and, thus, does not limit the application, including the claims that follow this description, in any way. Any provisions expressed in the description or claims should be considered in the context of this application and should be interpreted as a whole.

[0106] The embodiments of the present application are intended to cover all such alternatives, modifications, and variations as come within the scope of the broadest possible interpretation of the appended claims. Accordingly, any and all such alternatives, modifications, and variations should be included within the scope of the present application.

Claims

1. An airflow generating device, characterized by, The application relates to an air flow generating device. The device comprises: a main housing, which comprises a first housing and a second housing, and has an air inlet; an air outlet housing, which is separate from the main housing and forms a containing cavity together with the first housing and the second housing; the first end of the air outlet housing has an air outlet, and the second end of the air outlet housing is connected to the main housing; the radial dimension of the air outlet housing gradually decreases from the second end to the first end, so that a funnel-shaped air gathering chamber is formed in the air outlet housing; a motor assembly arranged in the containing cavity, which defines a motor axis and comprises a fan rotating around the motor axis; 2. The airflow generating device of claim 1, wherein, when the fan rotates, external air flows into the main housing through the air inlet, passes through the air gathering chamber and is blown out from the air outlet.

3. The airflow generating device of claim 1, wherein, The second end of the air outlet housing is provided with a positioning structure corresponding to the main housing, so that when the air outlet housing is connected to the main housing, the air outlet housing is prevented from moving axially and / or rotating relative to the main housing; the positioning structure comprises a first positioning part arranged on the air outlet housing and a second positioning part arranged on the main housing, and the first positioning part and the second positioning part are configured to be locked with each other in shape.

4. The airflow generating device of claim 1, wherein, The second end of the air outlet housing is provided with a stop structure corresponding to the main housing, so that when the air outlet housing is connected to the main housing, a labyrinth seal is formed.

5. The airflow generating device of claim 1, wherein, A first sealing structure is arranged between the air outlet housing and the main housing, and a second sealing structure is arranged between the first housing and the second housing.

6. The airflow generating device of claim 1, wherein, The motor assembly is supported on the inner wall of the air outlet housing, the projection of the motor assembly and the air outlet housing in the direction of the motor axis is coincident, and a damping member is arranged between the inner wall of the air outlet housing and the motor assembly.

7. The airflow generating device of claim 6, wherein The motor assembly comprises a cover, and an air guide gap is formed between the cover and the main housing, and the air guide gap is in air flow communication with the air gathering chamber.

8. The airflow generating device of claim 7, wherein, The motor assembly comprises a circuit board arranged close to the air outlet housing, the cover comprises a first cover arranged around the circuit board and a second cover arranged around the fan, an axial gap is arranged between the first cover and the second cover, and the axial gap is in air flow communication with the air guide gap.

9. The airflow generating device of claim 1, wherein, The second cover comprises a first air inlet arranged close to the fan, air flow generated by the rotation of the fan enters the motor assembly through the first air inlet and enters the air guide gap from the axial gap; a third sealing structure is arranged between the motor assembly and the main housing, and the third sealing structure is configured to seal the gap between the outer periphery of the first air inlet and the inner wall of the main housing, so that air flow is concentrated to enter the motor assembly from the first air inlet, and air flow is prevented from flowing back to the air inlet through the air guide gap. The first housing comprises a first main body part and a first handle part, the second housing comprises a second main body part and a second handle part, the first main body part is connected to the second main body part to form a main body part, and the first handle part is connected to the second handle part to form a holding part; the center line of the air inlet and the air outlet is coincident with or parallel to the motor axis; and the air flow generating device is used for blowing away dust.

10. An air flow generating device, comprising: A casing comprises a main shell, an air outlet shell connected to the main shell, and an accommodating cavity formed by the main shell and the air outlet shell; A motor assembly is located in the accommodating cavity; A battery pack provides power for the motor assembly; The main shell has an air inlet, and the air outlet shell has an air outlet; A first sealing structure is located between the air outlet shell and the main shell; An air guide gap is formed between the motor assembly and the main shell, and the air outlet shell is provided with a wind gathering chamber in communication with the air guide gap; the motor assembly drives rotation to enable external air to enter the air guide gap from the air inlet, flow through the wind gathering chamber, and then flow to the air outlet; and the airflow generating device is used for blowing away dust.

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