An electric air pump

Abstract

This application belongs to the technical field of air extraction equipment, specifically an electric air extraction pump, including a main unit and an impeller. The end of the main unit has an air inlet structure that connects to the air inlet channel. The impeller includes a shaft and multiple blades arranged around the shaft. The root end face of each blade has a recessed portion extending from the air inlet side of the impeller to the air outlet side, so that a recessed area is formed around the periphery of the shaft on the air inlet side of the impeller. By setting the recessed portion at the root of the blade, the recessed portions of each blade are combined to form an annular recessed area on the air inlet side of the impeller near the shaft. Therefore, when the impeller rotates, the air inlet space can be expanded, the air volume can be increased, and the extraction efficiency can be improved. By setting the recessed portion at the root of the blade near the shaft, the flow space can be expanded directly in the initial area where the airflow enters, avoiding the obstruction of the airflow by the blade root, allowing the air to flow more smoothly to the center of the impeller and reducing flow resistance.

Description

Technical Field

[0001] This application belongs to the field of air extraction equipment technology, specifically an electric air extraction pump. Background Technology

[0002] This section provides background information relevant to this application and is not necessarily prior art.

[0003] Existing electric air pumps typically consist of a main unit, a rotor, and a drive unit that rotates the rotor to generate negative pressure and achieve the air extraction function. However, the simple blade structure design of traditional rotors results in insufficient air intake, thus affecting extraction efficiency. Therefore, it is urgent to optimize the blade shape to expand the gas flow space on the air intake side of the rotor, thereby increasing the air intake volume. Summary of the Invention

[0004] The purpose of this application is to overcome the problem that the single blade structure of existing wind turbines leads to insufficient air intake, and to provide a method that expands the air intake space of the impeller by setting a recess at the root of the blade, thereby increasing its air intake and enhancing the pumping efficiency of the electric air pump.

[0005] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0006] An electric air pump includes a main unit with an internal air inlet channel and a fan wheel that is driven to rotate in the air inlet channel by a drive device. The end of the main unit has an air inlet structure communicating with the air inlet channel. The fan wheel includes a shaft and a plurality of blades arranged around the shaft. The root end face of each blade has a recessed portion extending from the air inlet side of the fan wheel to the air outlet side, so that a recessed area is formed around the periphery of the shaft on the air inlet side of the fan wheel.

[0007] Compared with the prior art, the electric air pump of this application has a recessed part at the root of the blade, so that the recessed parts of each blade are combined to form an annular recessed area near the shaft on the air intake side of the impeller. Therefore, when the impeller rotates, the air intake space can be expanded, the air intake volume can be increased, and the air extraction efficiency can be improved. By setting the recessed part at the root of the blade near the shaft, the flow space can be expanded directly in the initial area where the airflow enters, avoiding the obstruction of the airflow by the blade root, allowing the air to flow more smoothly to the center of the impeller and reducing flow resistance.

[0008] Furthermore, the arc length of the recessed portion along the blade centerline is less than 1 / 2 of the total arc length of the blade centerline, but greater than 1 / 4 of the total arc length of the blade centerline. The design of the above data can ensure that the recessed area covers the effective air intake range, while maintaining the structural strength of the blade and avoiding airflow disturbance caused by the area being too small or too large.

[0009] Furthermore, the depth of the recess is less than 1 / 6 of the blade height but greater than 1 / 8 of the blade height. The design of the above data can expand the flow space while ensuring the stiffness of the blade root and prevent structural deformation from affecting the stability of the wind turbine.

[0010] Furthermore, the two opposite ends of the recess are respectively provided with a first guide slope and a second guide slope. The provision of the guide slope can make the airflow transition smoothly and reduce resistance.

[0011] Furthermore, the first guide slope is smoothly connected to the side of the shaft, and the second guide slope is smoothly connected to the end face of the blade. The above arrangement avoids vortices caused by right-angle transitions and helps the airflow to be evenly introduced and discharged from the concave area.

[0012] Furthermore, the concave portions of each blade have the same shape, ensuring uniform airflow distribution and reducing vibration.

[0013] Furthermore, the outer edge of the wind turbine on the air inlet side is provided with a reinforcing ring that connects each blade. The reinforcing ring can enhance the structural strength at the blade edge and prevent the blade from deforming during rotation, causing uneven spacing between blades and resulting in fluctuations in wind noise.

[0014] Furthermore, the shaft portion is provided with a guide arc surface that bends and extends toward the air outlet side on the air inlet side. The guide arc surface can accelerate the flow speed of air when it passes through the shaft portion and smoothly guide it to the blades in all directions, thereby reducing wind resistance.

[0015] Furthermore, the drive device drives the wind turbine to rotate in a first direction, and the blade includes a first segment connected to the shaft and bent in a second direction, the first direction being opposite to the second direction. This arrangement, where the wind turbine rotates in the opposite direction to the blade bending direction, reduces wind pressure drag on the blade's front surface, making it easier for airflow to enter the wind turbine.

[0016] Furthermore, the blade also includes a second segment located at its end and connected to the first segment. The second segment is bent along the first direction. The above arrangement can change the airflow discharge trajectory, which helps to reduce backflow at the edge of the impeller and improve airflow efficiency. Attached Figure Description

[0017] Figure 1 A 3D view of an electric air pump;

[0018] Figure 2 An exploded view of an electric air pump;

[0019] Figure 3 This is a cross-sectional view of an electric air pump.

[0020] Figure 4The image shows a 3D view of the wind turbine and an enlarged view of the recessed area, with the dotted lines indicating the recessed area.

[0021] Figure 5 This is a three-dimensional view of the wind turbine from another angle;

[0022] Figure 6 This is a diagram showing the relationship between the arc length of the recess along the blade's extension direction and the total arc length of the blade.

[0023] Figure 7 This is a diagram showing the relationship between the depth of the recess and the blade height.

[0024] Figure 8 This is a schematic diagram of the structure of a bent blade. Detailed Implementation

[0025] The specific embodiments of this application are described below with reference to the accompanying drawings.

[0026] See Figures 1 to 3 This embodiment provides an electric air pump, including a main unit 1 and a drive device 3, a power module 4, and a fan 2 respectively installed inside the main unit 1. The main unit 1 has an air inlet channel 11, and the fan 2 is installed in the air inlet channel 11. The end of the main unit 1 has an air inlet structure 12 communicating with the air inlet channel 11. In one embodiment, the air inlet structure 12 is configured as multiple air inlet holes constructed at the end of the main unit 1. The power module 4 is used to provide electrical energy to the drive device 3. During operation, the drive device 3 drives the fan 2 to rotate, and the air inlet structure 12 drives external air to flow into the air inlet channel 11, thereby generating negative pressure to achieve the air extraction function. Of course, in order to achieve the air extraction function, the main unit 1 must also have an air outlet structure 13 communicating with the air inlet channel 11, for example, multiple air outlet holes are constructed on the main unit 1.

[0027] See Figures 1 to 3 In one embodiment, the device further includes an air extraction connector 5 detachably connected to the end of the main unit 1. The air extraction connector 5 has an internal air extraction channel 51 communicating with the air inlet structure 12. The air extraction connector 5 is used to connect to a suitable storage container, such as a vacuum compression bag or storage bag, to extract air from the storage container. The electric air pump of this application is equipped with various sizes of air extraction connectors 5, allowing the operator to select one to assemble at the end of the main unit 1, thereby adapting to various sizes of storage containers and improving the versatility of the electric air pump.

[0028] See Figure 3 and Figure 4The impeller 2 includes a shaft portion 21 and a plurality of blades 22 arranged around the shaft portion 21. The shaft portion 21 is configured with a shaft hole 212 for transmission connection with the output end of the drive device 3. During assembly, the air inlet side 201 of the impeller 2 faces the air inlet structure 12, and its air outlet side 202 faces away from the air inlet structure 12. The root end face of each blade 22 is configured with a recessed portion 23 extending from the air inlet side 201 of the impeller 2 to the air outlet side 202, so as to form a recessed area 203 surrounding the periphery of the shaft portion 21 on the air inlet side 201 of the impeller 2. The root of the blade 22 refers to the end of the blade 22 close to the shaft portion 21, and the end of the blade 22 refers to the end opposite the root of the blade 22.

[0029] See Figures 4 to 6 In one embodiment, such as Figure 6 As shown, the arc length of the recessed portion 23 along the extension direction of the blade 22 is defined as 'a', and the total arc length of the blade 22 is defined as 'b'. Therefore, the arc length 'a' of the recessed portion 23 along the extension direction of the blade 22 is less than 1 / 2 of the total arc length 'b' of the blade 22, but greater than 1 / 4 of the total arc length 'b' of the blade 22. In one specific embodiment, the arc length 'a' of the recessed portion 23 along the extension direction of the blade 22 is set to 1 / 3 of the total arc length 'b' of the blade 22. The design of the above data ensures that the recessed area 203 covers the effective air intake range while maintaining the structural strength of the blade 22, avoiding airflow disturbance caused by the area being too small or too large.

[0030] See Figure 4 , Figure 5 and Figure 7 In one embodiment, such as Figure 7 As shown, the depth of the recess 23 is c, and the height of the blade 22 is d. Therefore, the depth c of the recess 23 is less than 1 / 6 of the blade 22 height d, but greater than 1 / 8 of the blade 22 height d. In a specific implementation, the depth c of the recess 23 is set to 1 / 7 of the blade 22 height d. This design maximizes the flow space while ensuring the rigidity of the blade 22 root, preventing structural deformation from affecting the stability of the wind turbine 2. The aforementioned depth refers to the height of the recess 23 from the end face of the blade 22 to the bottom of the recess 23.

[0031] See Figure 4 and Figure 7 In one embodiment, the opposite ends of the recess 23 are respectively provided with a first guide slope 231 and a second guide slope 232. The first guide slope 231 and the second guide slope 232 are inclined radially from the inside to the outside, thereby making the airflow smooth and reducing resistance.

[0032] See Figure 4 and Figure 7The first guide slope 231 is smoothly connected to the side of the shaft 21, and the second guide slope 232 is smoothly connected to the end face of the blade 22. The above arrangement avoids the vortex generated by the right angle transition and helps the airflow to be evenly introduced and discharged from the concave area 203.

[0033] See Figure 4 and Figure 6 In one embodiment, the recesses 23 of each blade 22 have the same shape to ensure uniform airflow distribution and reduce vibration.

[0034] See Figure 4 and Figure 5 In one embodiment, the wind turbine 2 is provided with a reinforcing ring 24 on the outer edge of the air inlet side 201 to connect each blade 22. The reinforcing ring 24 can enhance the structural strength at the edge of the blade 22 and prevent the blade 22 from deforming during rotation, causing uneven spacing between the blades 22 and resulting in fluctuations in wind noise.

[0035] See Figure 4 In one embodiment, the shaft portion 21 is provided with a guide arc surface 211 that bends and extends toward the air outlet side 202 on the side of the air inlet side 201. The guide arc surface 211 can accelerate the flow speed of air when it flows through the shaft portion 21 and smoothly guide it to the blades 22 in all directions, thereby reducing wind resistance.

[0036] See Figure 3 , Figure 5 and Figure 8 In one embodiment, the drive device 3 drives the wind turbine 2 to rotate along a first direction x, and the blade 22 includes a first segment 221 connected to the shaft portion 21 and bent along a second direction y, wherein the first direction x is opposite to the second direction y. This arrangement, where the direction of rotation of the wind turbine 2 is opposite to the direction of bending of the blade 22, reduces the wind pressure drag on the front of the blade 22, making it easier for airflow to enter the wind turbine 2.

[0037] See Figure 5 and Figure 8 In one embodiment, the blade 22 further includes a second segment 222 located at its end and connected to the first segment 221, the second segment 222 being curved along the first direction x. Setting the end of the blade 22 to be curved along the second direction x changes the airflow discharge trajectory, helps reduce backflow at the edge of the impeller 2, and improves airflow efficiency.

[0038] Compared with the prior art, the electric air pump of this application provides a recessed portion 23 at the root of the blade 22, so that the recessed portions 23 of each blade 22 are combined to form an annular recessed area 203 on the air inlet side 201 of the impeller 2 near the shaft portion 21. Therefore, when the impeller 2 rotates, the air inlet space can be expanded, the air volume can be increased, and the air extraction efficiency can be improved. By setting the recessed portion 23 at the root of the blade 22 near the shaft portion 21, the flow space can be expanded directly in the initial area where the airflow enters, avoiding the obstruction of the airflow by the root of the blade 22, allowing the air to flow more smoothly to the center of the impeller 2 and reducing flow resistance.

[0039] The contents of the various embodiments of this application can be combined and referenced with each other, and all fall within the protection scope of this application.

[0040] Based on the disclosure and teachings of the foregoing specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this application is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this application should also fall within the protection scope of the claims of this application. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this application.

Claims

1. An electrically driven gas pumping pump, characterized in that The device includes a main unit (1) with an internal air inlet channel (11) and a wind turbine (2) driven to rotate in the air inlet channel (11) by a drive device (3). The end of the main unit (1) is provided with an air inlet structure (12) that connects to the air inlet channel (11). The wind turbine (2) includes a shaft (21) and a plurality of blades (22) arranged around the shaft (21). The root end face of each blade (22) is provided with a recess (23) that extends from the air inlet side (201) of the wind turbine (2) to the air outlet side (202), so as to form a recessed area (203) arranged around the periphery of the shaft (21) on the air inlet side (201) of the wind turbine (2).

2. An electrically driven gas pumping according to claim 1, characterized in that The arc length of the recess (23) along the extension direction of the blade (22) is less than 1 / 2 of the total arc length of the blade (22), but greater than 1 / 4 of the total arc length of the blade (22).

3. An electrically driven gas pumping according to claim 1, characterized in that, The depth of the recess (23) is less than 1 / 6 of the height of the blade (22) but greater than 1 / 8 of the height of the blade (22).

4. An electric gas pump according to claim 1, characterized in that The recessed portion (23) has a first guiding slope (231) and a second guiding slope (232) respectively at its two opposite ends.

5. An electrically driven gas pump according to claim 4, characterised in that, The first guide slope (231) is smoothly connected to the side of the shaft (21), and the second guide slope (232) is smoothly connected to the end face of the air inlet side (201) of the blade (22).

6. The electrically driven gas pump of claim 1, wherein, The recesses (23) of each blade (22) have the same shape.

7. An electrically driven gas pumping according to any of claims 1 to 6, characterized in that The wind turbine (2) is provided with a reinforcing ring (24) connecting each blade (22) on the outer edge of the air inlet side (201).

8. The electric air pump according to any one of claims 1 to 6, characterized in that, The shaft (21) is located on the air inlet side (201) and is surrounded by a guide arc surface (211) that curves and extends toward the air outlet side (202).

9. An electrically driven gas pumping according to any of claims 1 to 6, characterized in that The drive device (3) drives the wind turbine (2) to rotate in a first direction (x), and the blade (22) includes a first segment (221) connected to the shaft (21) and bent in a second direction (y), the first direction (x) being opposite to the second direction (y).

10. An electrically driven gas pump according to claim 9, characterised in that, The blade (22) also includes a second segment (222) located at its end and connected to the first segment (221), the second segment (222) being bent along the first direction (x).

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