Composite impeller and air pump

Abstract

The application relates to the technical field of impeller design, and discloses a composite impeller and an air pump. The composite impeller is applied to the air pump and mainly comprises a fan blade body, an upper cover and a positioning structure. The fan blade body comprises a main body part and a plurality of blade parts arranged on one side surface of the main body part; the upper cover is fixedly arranged on the side where the blade parts are located, the inner side surface of the upper cover is attached to the corresponding end surfaces of the blade parts, the upper cover and the fan blade body jointly form a closed flow channel structure, the flow channel structure is provided with a plurality of input ends and output ends corresponding to the input and output of the air source. The positioning structure is arranged between the fan blade body and the upper cover and is used for realizing accurate positioning of the two and preventing circumferential deflection. The scheme has compact structure, high flow guiding efficiency and good air tightness and is suitable for high-efficiency and low-noise gas conveying devices.

Description

Technical Field

[0001] This application relates to the field of impeller design technology, and further to a composite impeller and air pump. Background Technology

[0002] Existing air pumps often use centrifugal or axial flow impeller structures as the main air delivery device. These impellers typically consist of a fan-shaped body with multiple blades that works in conjunction with the corresponding air pump casing to form an airflow path. In practical applications, the impeller and its mating structure often only form a partially enclosed open flow channel. This structure may cause gas turbulence and energy loss due to leakage at the top clearance during high-speed operation, thereby affecting the air pump's output efficiency and overall operating noise level. Utility Model Content

[0003] To address the aforementioned technical problems, the purpose of this application is to provide a composite impeller and air pump, which offers a more reliable impeller structure, improves the sealing of the flow channel, and thus enhances the working efficiency of the impeller.

[0004] To achieve the above objectives, this application provides a composite impeller suitable for air pumps, comprising:

[0005] The fan blade body includes a main body portion and multiple blade portions, wherein the multiple blade portions are disposed on one side surface of the main body portion;

[0006] The upper cover is fixedly disposed on the side of the fan blade body where the blade portion is located, and the inner surface of the upper cover and the corresponding end face of the blade portion are in face-to-face contact, thereby making the upper cover and the fan blade body together form a closed flow channel structure; the flow channel structure has multiple input ends and multiple output ends, the input ends correspond to the input of the air source, and the output ends correspond to the output of the air source;

[0007] A positioning structure is disposed between the fan blade body and the upper cover to position the fan blade body between the upper cover and the fan blade body, so as to prevent circumferential deflection between the fan blade body and the upper cover.

[0008] In some embodiments, the upper cover is provided with a through hole in the axial direction, the through hole being provided corresponding to the central region of the fan blade body;

[0009] The blade portions are arranged around the central area of ​​the main body portion facing the upper cover, and are spaced apart in sequence. Each blade portion extends from the central area of ​​the main body portion to the circumferential edge of the main body portion.

[0010] In some embodiments, the end portion of each blade portion away from the central region of the main body is the lead-out end of the blade portion, and the end portion of each blade portion near the central region of the main body is the lead-in end of the blade portion; wherein the lead-out end protrudes radially relative to the edge of the main body and forms a continuous inclined surface with the main body.

[0011] In some embodiments, the end profile of the outlet is straight or arc-shaped to guide the gas out along the rotational tangential direction;

[0012] And / or, the end profile of the inlet is arc-shaped for gas diversion;

[0013] And / or, the center of the main body protrudes towards the upper cover, and thus the corresponding inlet end is higher than the corresponding outlet end in the height direction of the fan blade body.

[0014] In some embodiments, the plurality of blade portions include a plurality of first blades and a plurality of second blades, the length of the first blades being greater than the length of the second blades, and the first blades and the second blades being arranged alternately, such that in the circumferential direction of the fan blade body, a second blade is sandwiched between every two first blades.

[0015] The inlet ends of the first blades are all located on the trajectory of the first base circle, which has the center of the main body as its center and its diameter as the first diameter.

[0016] The inlet ends of the second blades are all located on the trajectory of the second base circle, which has the center of the main body as its center and a diameter of the second diameter. The first diameter is smaller than the second diameter, thereby making the inlet ends of the first blades closer to the center of the main body relative to the inlet ends of the second blades, so as to play a guiding role.

[0017] In some embodiments, a fluid cavity is formed between every two blade portions in the fan blade body, and the two openings of each fluid cavity correspond to an input end and an output end, respectively, thereby forming the flow channel structure by the multiple fluid cavities and the upper cover.

[0018] In this process, multiple blade sections simultaneously bend and / or twist in a clockwise or counterclockwise direction, making the fluid cavity a non-linear flow channel.

[0019] In some embodiments, the fluid cavity forms a flow-guiding structure with a gradually increasing flow area in the gas outlet direction;

[0020] And / or, the main body has a disc-shaped structure, and the center of the main body is provided with a mounting hole for connecting the drive shaft of the drive mechanism inside the air pump, so that the compound impeller can rotate under the drive action;

[0021] And / or, the surface of the upper cover is provided with a number of reinforcing ribs to enhance the structural strength of the upper cover.

[0022] In some embodiments, the positioning structure includes a plurality of first positioning parts and second positioning parts. The first positioning parts are disposed on the top end face or side end face of the blade part, and the second positioning parts are disposed on the end face of the upper cover facing the fan blade body. The first positioning parts and the second positioning parts are matched and disposed to form a relative fit in the assembled state, thereby assisting in the relative positioning between the fan blade body and the upper cover.

[0023] In some embodiments, the first positioning part is disposed on the top end face of the blade portion, and each blade portion is provided with at least two positioning parts spaced apart along its length direction;

[0024] The first positioning part is a positioning post / positioning hole, and the second positioning part is a positioning hole / positioning post that cooperates with the first positioning part. In the assembled state, the positioning post is inserted into the positioning hole for positioning.

[0025] Another aspect of this application also provides an air pump, comprising:

[0026] The composite impeller in any of the above embodiments;

[0027] Pump casing;

[0028] A drive mechanism and the compound impeller are disposed inside the pump casing, wherein the drive mechanism and the compound impeller are connected and are used to drive the compound impeller to rotate around its axis to form an airflow inside the pump casing.

[0029] Compared with the prior art, the composite impeller and air pump provided in this application have at least the following beneficial effects:

[0030] This application constructs a closed airflow channel structure by installing a top cover above the blade section of the fan blade body and fitting it against the end face of the blade section. This effectively avoids gas leakage and vortex losses that occur in traditional open impellers during high-speed rotation, improving exhaust efficiency and compression effect while reducing aerodynamic noise. Simultaneously, by incorporating a positioning structure between the fan blade body and the top cover, precise alignment during assembly is achieved, preventing relative circumferential deflection. This contributes to improving overall operational balance and reliability, and enhancing structural stability. Attached Figure Description

[0031] The preferred embodiments will now be described in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of this application.

[0032] Figure 1 This is an exploded structural diagram of a composite impeller in one embodiment of this application;

[0033] Figure 2 This is a schematic diagram of the overall structure of the composite impeller in one embodiment of this application from one viewpoint;

[0034] Figure 3 This is a schematic diagram of the overall structure of the compound impeller in one embodiment of this application from another perspective;

[0035] Figure 4 This is a cross-sectional structural schematic diagram of a composite impeller in one embodiment of this application;

[0036] Figure 5 This is a top view of the fan blade body in one embodiment of this application;

[0037] Figure 6 This is a schematic diagram of the overall structure of the air pump in one embodiment of this application;

[0038] Figure 7 This is a partial cross-sectional view of an air pump in one embodiment of this application.

[0039] Reference numerals: Top cover 1; Through hole 10; Reinforcing rib 11; Fan blade body 2; Flow channel structure 200; Main body 21; Mounting hole 210; Blade part 22; Fluid cavity 220; Inlet end 2201; Outlet end 2202; First blade 221; First base circle 2210; Second blade 222; Second base circle 2220; Positioning structure 3; First positioning part 31; Second positioning part 32; Pump casing 4; Air inlet 401; Air outlet 402; Drive mechanism 5. Detailed Implementation

[0040] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the specific implementation methods of this application will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without creative effort.

[0041] To keep the drawings concise, each drawing only schematically shows the parts relevant to the application; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one."

[0042] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0043] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0044] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0045] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0046] Air pumps, as common gas transmission devices, are widely used in tire inflation, portable air cushions, air circulation, and other scenarios. The impeller structure is the core component of an air pump that compresses and propels gas. It typically includes a fan-shaped body with multiple blades, which rotates to generate gas flow and compression. Existing technologies often employ open or semi-open impeller structures, where the top of the impeller is open or only partially confined by the air pump housing, to create a simple gas flow path.

[0047] However, in this type of open structure, the blade tip lacks structural coverage, and the resulting flow channel is not fully enclosed. This makes it prone to top gap leakage when the impeller rotates at high speed, leading to the loss of some gas and the formation of backflow or vortex phenomena. This reduces the overall output pressure and flow efficiency, increases energy consumption, and causes unstable noise.

[0048] In one embodiment, refer to the appendix to the specification. Figure 1 This application describes a composite impeller that improves gas flow efficiency, thereby ensuring stable output of the air pump device.

[0049] Reference manual attached Figure 1 The present application provides a composite impeller suitable for air pumps, including an upper cover 1, a fan blade body 2, and a positioning structure 3 disposed between the two.

[0050] The fan blade body 2 is provided with a main body 21 and multiple blade sections 22. The multiple blade sections 22 are located on one side surface of the main body 21 and are used to guide the gas flow during the rotation of the impeller.

[0051] like Figure 2 and Figure 3 As shown, the upper cover 1 is fixedly disposed on the side of the fan blade body 2 where the blade portion 22 is located, and its inner surface is in face-to-face contact with the corresponding end face of the blade portion 22, thereby forming a closed flow channel structure 200 between the upper cover 1 and the fan blade body 2. The flow channel structure 200 has multiple input ends and multiple output ends. The input ends are used to receive the inflow of gas, and the output ends are used to discharge gas, completing the intake and compression of gas during the rotation of the impeller.

[0052] It should be noted that the "closed flow channel structure" referred to in this application does not mean a completely sealed cavity without any through holes, but rather a top-closed airflow channel enclosed above the blade section 22 through the structural cooperation between the upper cover 1 and the blade body 2. This transforms the originally open area above the blade into a confined space, thereby improving the controllability of the gas flow path. This closed structure effectively suppresses top leakage and turbulence while maintaining unobstructed airflow at both the inlet and outlet ends, thus improving gas compression efficiency. Therefore, this flow channel structure 200 is a "relatively closed" or "partially closed" structure relative to an open impeller, with its inlet and outlet ends still serving as unobstructed airflow channels.

[0053] In the above structure, the enclosed flow channel is formed through the interface between the blade section 22 and the upper cover 1, effectively covering the area above the blades that is prone to leakage or disturbance. This allows the gas to flow in a controlled manner within the flow channel, helping to reduce efficiency losses caused by airflow escape or backflow. At the same time, the enclosure of the flow channel structure 200 helps maintain the directionality and continuity of the airflow, optimizes the impeller output characteristics, improves overall compression efficiency, and suppresses operating noise.

[0054] In this embodiment, a positioning structure 3 is provided between the fan blade body 2 and the upper cover 1. The positioning structure 3 is used to accurately guide the relative position of the upper cover 1 when it is installed onto the fan blade body 2, so as to ensure the assembly stability of the upper cover 1 and the fan blade body 2 during use, prevent the two from deflecting in the circumferential direction under the influence of external forces, thereby ensuring the reliability and airtightness of the flow channel structure 200, and helping to maintain the stability of the airflow channel and the reliability of equipment operation.

[0055] Understandably, the composite impeller described in this embodiment solves the gas leakage and disturbance problems caused by the open structure of existing open impellers by constructing a closed flow channel structure on the basis of a traditional impeller and providing a positioning structure 3. It also overcomes the misalignment and deflection risks in the assembly process of the upper cover 1 and the impeller, improves the overall operating efficiency, pressure delivery capacity and structural reliability, and is suitable for various types of air pump systems.

[0056] Furthermore, the positioning structure 3 between the fan blade body 2 and the upper cover 1 can be implemented in various ways. For example, several matching guide rails, guide grooves or limiting stops can be set in the corresponding contact areas of the two, so that the upper cover 1 can be inserted along a predetermined trajectory and automatically aligned with the predetermined position during the assembly process, thereby improving the accuracy and efficiency of the assembly process.

[0057] In one embodiment, based on the above embodiments, the fixing method between the fan blade body 2 and the upper cover 1 is ultrasonic welding connection. Specifically, structural components for welding can be provided in the corresponding contact areas of the fan blade body 2 and the upper cover 1. The contact interface is rapidly melted and fused and solidified under the action of local high-frequency vibration through ultrasonic welding process, so as to achieve a stable connection without the intervention of external fasteners.

[0058] Understandably, this connection method not only improves the airtightness between components and effectively prevents leakage at the flow channel interface, but also has high connection strength and high processing efficiency, making it suitable for mass production and standardized manufacturing.

[0059] In another embodiment, the main body 21 is preferably configured as a disk-shaped structure. The disk-shaped structure has good axisymmetry and can achieve a balanced mass distribution during rotation, thereby reducing vibration and energy loss caused by rotational imbalance.

[0060] Furthermore, the central area of ​​the main body 21 is provided with a mounting hole 210 for mechanical connection with the drive shaft installed inside the air pump. The mounting hole 210 can be fixed to the drive shaft by means of interference fit, key connection or threaded connection, etc., to ensure that the compound impeller can rotate stably and synchronously with the drive shaft during operation without slippage or deviation.

[0061] In one embodiment, such as Figure 4 As shown, the upper cover 1 is provided with a through hole 10 extending through its axis. The through hole 10 is located in the central region of the upper cover 1 and corresponds to the central region of the fan blade body 2. The through hole 10 serves as part of the air source input path, allowing gas to enter the closed flow channel structure 200 formed between the fan blade body 2 and the upper cover 1 from the outside of the upper cover 1. This allows the gas to be drawn in and guided by the rotating impeller. This structural design effectively guides external air sources into the internal closed channel along the axial direction, simplifying the overall air intake path and helping to improve the system's air intake smoothness and response speed.

[0062] Furthermore, the blade section 22 surrounds the central area of ​​the main body section 21 facing the upper cover 1 and is arranged sequentially at intervals. Each blade section 22 extends from the central area of ​​the main body section 21 to the circumferential edge of the main body section 21, so that multiple blades are arranged radially around the central area. This enables the gas flowing in from the through hole 10 to be centrifugally pushed when the impeller rotates, causing the gas to diffuse rapidly along the radial path to the output end in the circumferential direction, achieving stable flow output and compression effect. This helps to improve the continuity and stability of gas flow in the flow channel, reduce the generation of dead flow angles, and reduce turbulence and energy loss.

[0063] Understandably, this embodiment achieves the connection between axial inlet and radial outlet flow through the cooperative arrangement of the through hole 10 and the blade section 22, which improves the overall aerodynamic efficiency and enhances the flow field controllability and applicability of the compound impeller. This makes the compound impeller in this application very suitable for portable air pump devices with high requirements for the simplicity of the air inlet path and the compactness of the structure.

[0064] In practical applications, the opening size, orifice shape, and air intake direction of the through hole 10 can be adapted and adjusted. For example, it can be set as a single central through hole or a group of multiple symmetrically distributed vent holes to achieve control over the intake speed and distribution uniformity. The spacing and radial length of the blade section 22 can also be flexibly configured according to different flow output requirements. All of the above-mentioned modifications do not exceed the basic design concept of this application and should be included within the protection scope of this application.

[0065] In one embodiment, such as Figure 5As shown, each blade portion 22 has two ends, one facing the central region of the main body portion 21 and the other away from the central region. The end closer to the central region of the main body portion 21 is the inlet end 2201 of the blade portion 22, used to receive gas, and the end away from the central region of the main body portion 21 is the outlet end 2202 of the blade portion 22, used to discharge gas. Furthermore, the outlet end 2202 is convex outward relative to the edge of the main body portion 21 in the radial direction, and forms a continuously transitioning inclined surface with the main body portion 21.

[0066] Understandably, the above structural design allows the blade portion 22 to transition with the main body portion 21 at its outermost radial edge through an inclined, convex slope. This provides a wider gas outlet channel in this area during impeller rotation. The blade portion 22 with its convex design effectively extends the outlet area, allowing gas to be smoothly discharged from the outermost area. This helps to increase the exhaust volume and flow efficiency per unit time, thereby significantly enhancing the flow output capacity of the air pump.

[0067] Please refer to the instruction manual attached. Figure 7 In the gas flow direction (as indicated by the arrow in the attached diagram), the outlet end 2202 protrudes relatively outward in the upstream position. Therefore, when applied inside an air pump, the outlet end 2202 is positioned opposite the pump's housing structure, resulting in a relatively small flow channel clearance in the upstream region. This allows for stronger compression and pushing of the gas during rotation, increasing the output pressure. The flow channel clearance in the downstream region is wider than that in the upstream region, further enhancing the output flow rate. This overall achieves a greater axial pushing force and helps form a more enclosed and efficient flow field structure within the air pump's housing structure, thereby optimizing the gas delivery path and reducing aerodynamic losses.

[0068] In summary, by designing the outward-protruding structure of the outlet end 2202 of the blade section 22, not only can the air outlet area be expanded within a limited radial dimension to meet the high exhaust flow requirements of a small-volume air pump, but the guiding and sealing performance of the blade section 22 can also be enhanced, thereby improving the pushing efficiency and system operation stability. This design has significant practical engineering value.

[0069] In practical applications, the tilt angle, outward convexity, and transition method between the outlet end 2202 and the main body 21 can be adjusted in various ways according to the design requirements of the internal contour of the air pump housing 4 and the airflow direction.

[0070] Based on the above embodiments, in order to further improve the performance of the compound impeller in terms of airflow guidance, flow field distribution and thrust output, the structural forms of the inlet end 2201 and outlet end 2202 of the blade section 22 can be diversified and extended.

[0071] Specifically, in one optional embodiment, as shown in the figure, the end profile of the outlet end 2202 can be arranged in a straight line or an arc shape, so that the gas is guided out along the rotation tangent direction during the impeller rotation, which helps to improve the directionality of the airflow and reduce the vortex or deflection phenomenon of the gas during the outflow process, thereby improving the overall flow efficiency and flow stability, especially suitable for application scenarios with high requirements for the directionality of the outflow.

[0072] In contrast, in another embodiment, the end profile of the inlet 2201 can be arc-shaped to flexibly divert the gas flow introduced from the top cover 1. Compared to a straight inlet structure, the arc-shaped inlet 2201 can achieve a smoother velocity transition and path guidance in the initial stage of gas entering the flow channel, which helps to suppress flow stagnation and turbulence formation, improve intake efficiency, and enhance the stability of the guiding path, thereby improving the aerodynamic performance of the entire flow channel system.

[0073] In addition, as shown in the attached figure, the inlet end 2201 of the blade section 22 has a contour shape composed of multiple arcs. In practice, this attached figure indicates that the inlet end 2201 has a certain spatial slope, which provides a certain initial guiding angle, so that the gas can enter the flow channel more smoothly and effectively guide the gas to flow into the flow channel in a smoother manner, reducing airflow impact and energy loss.

[0074] Furthermore, in another alternative embodiment, the central region of the main body 21 may protrude along the height direction to the side of the upper cover 1, that is, the central region forms a relatively raised structure on the side near the upper cover 1.

[0075] Correspondingly, the inlet end 2201 of the blade section 22 located in the central region will be higher than its outlet end 2202 in the height direction, so that each blade presents a longitudinal section arrangement with the front higher and the rear lower. This can effectively utilize the combined effect of gravity and air pressure difference to enhance the blade's pressure delivery angle on the gas during rotation, which helps to increase the acceleration of a unit volume of gas in a shorter radial path, thereby enhancing thrust output and optimizing the spatial arrangement to better fit the contour structure of the air pump cavity.

[0076] It is understood that the above-described embodiments can be selected independently according to specific application requirements, or can be combined and configured in any way to achieve multi-angle control of gas introduction and export paths and synergistic improvement of overall aerodynamic performance.

[0077] In one embodiment, please refer to the appendix to the specification. Figure 5The multiple blade section 22 includes multiple first blades 221 and multiple second blades 222, wherein the length of the first blades 221 is greater than the length of the second blades 222. The first blades 221 and the second blades 222 are arranged alternately along the circumferential direction of the fan blade body 2, forming an orderly arranged composite blade structure. More specifically, a second blade 222 is arranged between every two first blades 221, so that the first blades 221 and the second blades 222 are arranged alternately, which enhances the diversity and continuity of the gas guiding path.

[0078] The inlet ends 2201 of the first blade 221 are evenly distributed on a first base circle 2210 with the center of the fan blade body 2 as the center and the diameter as the first diameter; the inlet ends 2201 of the second blade 222 are evenly distributed on a second base circle 2220 with the same center but a larger diameter, wherein the first diameter is smaller than the second diameter, so that the first blade 221 is closer to the center region of the fan blade body 2 at its inlet end 2201 position than the second blade 222, so that when the gas enters the flow channel from the through hole 10 of the upper cover 1, it will preferentially contact the inlet end 2201 of the first blade 221.

[0079] Understandably, the first blade 221, being closer to the center, can first capture the gas flow in the central intake area during impeller rotation, playing a preliminary guiding and distribution role. Then, it further promotes the gas to diffuse radially to the outlet end 2202, forming a smoother flow path.

[0080] By differentiating the lengths and positions of the first blade 221 and the second blade 222, not only is the overall flow coverage of the blades enhanced, but the uniformity of the flow field is also improved, effectively suppressing local airflow accumulation or turbulence. Under rotational drive, the staggered arrangement of the first blade 221 and the second blade 222 can create a combined centrifugal flow effect, allowing the gas to be fully propelled in a short time, thereby increasing the gas discharge velocity and compression efficiency.

[0081] In the specific design, the ratio of the number of the first blade 221 to the second blade 222, the arrangement angle, the blade width and the position of the inlet end 2201 can be flexibly adjusted according to the target airflow parameters, thereby forming an impeller structure that adapts to various working conditions.

[0082] In one embodiment, in the fan blade body 2, a fluid cavity 220 is defined between every two adjacent blade portions 22. The fluid cavity 220 has opposing opening structures on both sides, corresponding to an input end and an output end of the flow channel structure 200, respectively. Multiple such fluid cavities 220 are circumferentially distributed around the central region of the body portion 21, and together with the fixed upper cover 1, they collectively form multiple independent and orderly centrifugal flow paths, thus forming the "closed flow channel structure" mentioned above.

[0083] Furthermore, in this application, the multiple blade sections 22 can be configured in a uniform direction (such as clockwise or counterclockwise) to have a certain degree of bending or twisting structure, that is, the blade body presents a spatial curved surface or spiral deformation in its length direction or thickness direction.

[0084] It should be noted that this structure not only changes the geometric path of the fluid channel 220, transforming it from a traditional straight channel into a non-linear channel with tortuous or spiral streamlines, but also significantly enhances the gas pushing effect during actual operation.

[0085] Specifically, when the compound impeller is working at high speed, the curved or twisted blades can apply a stronger tangential thrust to the gas entering the flow channel per unit time, so that the gas generates a higher rotational speed component and centrifugal acceleration under the drive of the blades, thereby causing the gas to gradually accumulate kinetic energy along the curved channel and be discharged at high speed from the outlet end 2202, which not only increases the gas discharge speed, but also improves the overall gas pressure conveying efficiency.

[0086] Thus, compared to straight blade structures, blades with curved or torsional structures can more fully utilize the rotational kinetic energy of the impeller to act on the gas, thereby achieving greater output flow rate and pressure under the same input power conditions. Furthermore, because the gas is continuously guided along the curved flow path, its path is more stable and the turbulence is lower, contributing to a more uniform and smooth flow field. This also significantly reduces aerodynamic noise and improves the overall operational stability of the pump.

[0087] Furthermore, in one embodiment, each fluid cavity 220 forms a flow-guiding structure with a gradually increasing flow area in the gas outlet direction. That is, along the path of gas entering from the inlet end 2201 and exiting from the outlet end 2202, the cross-sectional area inside the cavity gradually increases, thereby forming a structural characteristic similar to a diffuser channel.

[0088] After being accelerated by the blades, the gas enters the flow channel. As it flows within the gradually expanding channel, its velocity can be effectively controlled, while its pressure increases accordingly, thus achieving a conversion from velocity to pressure. This design not only helps to improve the overall output pressure level but also reduces flow losses and the formation of local vortices through a smooth cross-sectional transition.

[0089] In addition, the gradual expansion of the flow area can provide more space for the exhaust of gas moving at high speed, avoid back pressure or airflow backflow caused by local contraction, and help stabilize the flow output and reduce operating noise.

[0090] In one embodiment, such as Figure 1 As shown, the surface of the upper cover 1 is provided with several reinforcing ribs 11 to enhance the structural strength of the upper cover 1. The reinforcing ribs 11 can be set on the outer or inner surface of the upper cover 1 according to its overall shape, preferably distributed along the radial or circumferential direction of the upper cover 1, forming a stiffening rib structure to effectively improve the deformation resistance of the upper cover 1 under working conditions. In specific designs, the reinforcing ribs 11 can be arranged in a straight line, an arc, or a grid pattern, without specific limitations.

[0091] It is understandable that the composite impeller needs to withstand multiple loads such as airflow pressure and rotational inertia during operation. In particular, the upper cover 1 is a key component that forms a closed flow channel with the fan blade body 2. If its structural strength is insufficient, it is very easy to cause local deformation or fatigue cracks, thereby affecting the sealing of the flow channel and the gas guiding effect.

[0092] Thus, by setting the reinforcing ribs 11 in this embodiment, the bending stiffness and overall load-bearing capacity of the panel structure can be improved without significantly increasing the thickness and overall weight of the top cover 1, ensuring the reliability and durability of the top cover 1 during long-term, high-frequency operation.

[0093] In one embodiment, based on the above, such as Figure 1 As shown, the positioning structure 3 includes several first positioning parts 31 and second positioning parts 32. The first positioning parts 31 are disposed on the top end face or side end face of the blade part 22, and the second positioning parts 32 are disposed on the end face of the upper cover 1 facing the fan blade body 2. The two are matched with each other and are assembled to form a fitting fit, thereby constructing a stable and reliable relative positioning relationship.

[0094] Understandably, the design of the positioning structure 3 can effectively prevent circumferential offset or assembly misalignment between the fan blade body 2 and the upper cover 1 due to human error or rotational interference during the actual assembly process, so as to ensure the reliability of the flow channel structure 200.

[0095] Furthermore, the first positioning part 31 and the second positioning part 32 preferably adopt a complementary shape structure, such as a concave-convex fit, a conical insertion, or a cylindrical hole positioning. During assembly, self-guiding positioning can be achieved through a simple push-and-close operation, reducing reliance on manual calibration and improving assembly efficiency and consistency. In addition, the positioning structure 3 can provide a certain positioning constraint in the radial direction during the operation of the air pump, thereby effectively suppressing structural loosening caused by airflow pulsation or vibration, and improving the overall mechanical stability and reliability of the impeller.

[0096] In a specific implementation, the first positioning part 31 can be set on the top or outer side of some or all of the blade parts 22 so as to be aligned with the second positioning part 32 on the upper cover 1 one by one; the second positioning part 32 is set in the corresponding area of ​​the upper cover 1 according to the distribution of the first positioning part 31, and can be a partial protrusion, a post, a limiting groove or other structural form.

[0097] Specifically, in one embodiment, a first positioning part 31 is disposed on the top end face of the blade part 22, and each blade part 22 is provided with at least two positioning parts at intervals along its length. The first positioning part 31 is a positioning post or a positioning hole, and the second positioning part 32 is a positioning hole or a positioning post that cooperates with it. In the assembled state, the positioning post is embedded in the corresponding positioning hole, thereby realizing a stable positioning fit between the components.

[0098] By directly placing the first positioning part 31 on the top end face of the blade part 22, the structural characteristics of the fit between the upper cover 1 and the top of the blade can be fully utilized to achieve effective positioning without occupying additional structural space; moreover, it will not affect the side structure of the blade part 22, thereby ensuring the flow rate and pressure of the flow channel structure 200.

[0099] Meanwhile, each blade section 22 is provided with multiple first positioning sections 31 along its length, which not only forms a multi-point positioning effect, effectively improving the consistency of assembly and the ability to resist offset, but also disperses the local stress concentration caused by gas impact or vibration under high-speed rotation, thereby further improving the overall fatigue resistance and operational stability of the structure.

[0100] It should be noted that the fit between the positioning post and the positioning hole can be an interference fit, a transition fit, or a clearance fit to suit different assembly requirements. As shown in the figure, the positioning post is located on the top end face of the blade section 22, and the corresponding positioning hole is located on the inner surface of the upper cover 1 facing the fan blade body 2. The two form a stable fit through an interlocking method during assembly.

[0101] Through the above-described structure, natural guided positioning and insertion can be achieved during impeller assembly, significantly reducing relative misalignment caused by assembly tolerances, component deformation, or human error. This ensures the consistency and symmetry of the fluid channels 220 between the blades, thereby guaranteeing a stable flow path for the gas within the channels. Simultaneously, the engagement between the positioning pins and positioning holes can also enhance the connection strength between the upper cover 1 and the fan blade body 2 to a certain extent, contributing to improved structural resistance to torsion and vibration.

[0102] In one embodiment, refer to the appendix to the specification. Figure 6 and Figure 7 According to another aspect of this application, this application further provides an air pump, including the compound impeller, pump casing 4 and drive mechanism 5 in any of the above embodiments, wherein the drive mechanism 5 and the compound impeller are both disposed inside the pump casing 4, and the gas is guided to flow in a directional manner through the closed flow channel in the compound impeller. The drive mechanism 5 is connected to the compound impeller and is used to drive it to rotate continuously around the axis, so as to establish an effective airflow delivery channel inside the pump casing 4 and realize the functions of gas intake, pressurization and discharge.

[0103] Meanwhile, the pump casing 4 is also provided with corresponding air inlet 401 and air outlet 402, which, together with the input end and output end of the flow channel structure 200 in the composite impeller, form a flow path inside the air pump. Specifically, in conjunction with the above embodiment, the air inlet 401 corresponds to the through hole 10 of the upper cover 1, so that the gas can flow directly through the open air inlet 401 into the closed flow channel between the upper cover 1 and the fan blade body 2. With the rotation action of the drive mechanism 5, the gas forms a controllable centrifugal flow field inside the pump casing 4, thereby improving the gas delivery rate and compression efficiency.

[0104] Optionally, in some implementations, the drive mechanism 5 may be in the form of a motor assembly or a magnetic drive device, installed inside the pump housing 4 or forming an integral structure with the pump housing 4. The composite impeller achieves a stable connection with the drive shaft through central positioning, thereby achieving continuous high-speed rotation under electric drive.

[0105] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of this application. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A composite impeller, characterized in that, Suitable for air pumps, including: The fan blade body includes a main body portion and multiple blade portions, wherein the multiple blade portions are disposed on one side surface of the main body portion; The upper cover is fixedly disposed on the side of the fan blade body where the blade portion is located, and the inner surface of the upper cover and the corresponding end face of the blade portion are in face-to-face contact, thereby making the upper cover and the fan blade body together form a closed flow channel structure; the flow channel structure has multiple input ends and multiple output ends, the input ends correspond to the input of the air source, and the output ends correspond to the output of the air source; A positioning structure is disposed between the fan blade body and the upper cover to position the fan blade body between the upper cover and the fan blade body, so as to prevent circumferential deflection between the fan blade body and the upper cover.

2. The composite impeller according to claim 1, characterized in that, The upper cover is provided with a through hole in the axial direction, and the through hole is provided in the central area of ​​the fan blade body; The blade portions are arranged around the central area of ​​the main body portion facing the upper cover, and are spaced apart in sequence. Each blade portion extends from the central area of ​​the main body portion to the circumferential edge of the main body portion.

3. The composite impeller according to claim 2, characterized in that, The end of each blade portion away from the central region of the main body is the lead-out end of the blade portion, and the end of each blade portion near the central region of the main body is the lead-in end of the blade portion; wherein, the lead-out end protrudes radially relative to the edge of the main body and forms a continuous inclined surface with the main body.

4. The composite impeller according to claim 3, characterized in that, The end profile of the outlet is straight or arc-shaped, used to guide the gas to flow out along the rotational tangent direction; And / or, the end profile of the inlet is arc-shaped for gas diversion; And / or, the center of the main body protrudes towards the upper cover, and thus the corresponding inlet end is higher than the corresponding outlet end in the height direction of the fan blade body.

5. The composite impeller according to claim 3, characterized in that, The plurality of blade portions include a plurality of first blades and a plurality of second blades, wherein the length of the first blade is greater than the length of the second blade, and the first blades and the second blades are arranged alternately, such that in the circumferential direction of the fan blade body, a second blade is sandwiched between every two first blades; The inlet ends of the first blades are all located on the trajectory of the first base circle, which has the center of the main body as its center and its diameter as the first diameter. The inlet ends of the second blades are all located on the trajectory of the second base circle, which has the center of the main body as its center and a diameter of the second diameter. The first diameter is smaller than the second diameter, thereby making the inlet ends of the first blades closer to the center of the main body relative to the inlet ends of the second blades, so as to play a guiding role.

6. The composite impeller according to any one of claims 1-5, characterized in that, In the fan blade body, a fluid cavity is formed between every two blade sections. The two openings of each fluid cavity correspond to an input end and an output end, respectively. The flow channel structure is formed by multiple fluid cavities and the upper cover. In this process, multiple blade sections simultaneously bend and / or twist in a clockwise or counterclockwise direction, making the fluid cavity a non-linear flow channel.

7. The composite impeller according to claim 6, characterized in that, The fluid cavity forms a flow-guiding structure with a gradually increasing flow area in the direction of gas outlet; And / or, the main body has a disc-shaped structure, and the center of the main body is provided with a mounting hole for connecting the drive shaft of the drive mechanism inside the air pump, so that the compound impeller can rotate under the drive action; And / or, the surface of the upper cover is provided with a number of reinforcing ribs to enhance the structural strength of the upper cover.

8. The composite impeller according to any one of claims 1-5 and 7, characterized in that, The positioning structure includes a plurality of first positioning parts and second positioning parts. The first positioning parts are disposed on the top end face or side end face of the blade part, and the second positioning parts are disposed on the end face of the upper cover facing the fan blade body. The first positioning parts and the second positioning parts are matched and disposed to form a relative fit in the assembled state, thereby assisting in the relative positioning between the fan blade body and the upper cover.

9. The composite impeller according to claim 8, characterized in that, The first positioning part is disposed on the top end face of the blade part, and each blade part is provided with at least two positioning parts at intervals along its length direction; The first positioning part is a positioning post / positioning hole, and the second positioning part is a positioning hole / positioning post that cooperates with the first positioning part. In the assembled state, the positioning post is inserted into the positioning hole for positioning.

10. An air pump, characterized in that, include: The composite impeller according to any one of claims 1-9; Pump casing; A drive mechanism and the compound impeller are disposed inside the pump casing, wherein the drive mechanism and the compound impeller are connected and are used to drive the compound impeller to rotate around its axis to form an airflow inside the pump casing.

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