Novel impeller assembly structure
By designing the steps and positioning surfaces in the impeller assembly, using straight knurled rotary shafts and precisely matched mesoporous design, combined with chip storage tanks to collect plastic chips, the problems existing in the connection between the impeller and the rotary shaft are solved, and an efficient, safe and automated assembly process is achieved, improving the reliability and durability of the product.
Patent Information
- Application Number
- CN202421487496.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-06-27
AI Technical Summary
The existing thermal rivet technology has problems such as low production safety, low assembly efficiency, difficulty in achieving automation, and dependence on high-temperature processes in the connection between the impeller and the rotating shaft.
The new impeller assembly structure is adopted, and the steps and positioning surfaces are designed on the impeller, so that the impeller can be positioned quickly and accurately, and efficient cold riveting pressing is achieved through straight knurled rotating shafts and precisely matched mesoporous designs. At the same time, a chip storage tank is set up to collect plastic chips generated during the cold rivet to ensure coaxiality and high-precision coordination.
It significantly improves assembly speed and reliability, reduces production costs and labor costs, reduces dependence on high-temperature processes, improves product reliability and durability, and promotes automated production.
Smart Images
Figure CN222615656U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of detecting micro-motors, in particular to a novel impeller component structure. Background Art
[0002] The field of micro-motor technology, especially drainage pumps or drainage motor products in household appliances, is in a rapid development stage. These products have increasingly higher performance requirements for impeller components, aiming to improve energy efficiency, reduce noise, enhance reliability and extend service life. With the popularization of smart homes and consumers' increasing attention to environmental protection and energy saving, the requirements for motor efficiency and durability are also increasing.
[0003] At present, the connection between the impeller and the shaft mostly adopts hot riveting technology to make the rotation stable, thereby achieving the purpose of reducing noise, enhancing reliability and extending service life.
[0004] Regarding the above-mentioned related technologies, although hot riveting technology is widely used in the connection between impellers and rotating shafts, its shortcomings are also quite obvious. First, the production safety is low, and the high-temperature operation in the hot riveting process is likely to cause injury to employees. Secondly, the assembly efficiency is low, especially when the temperature is low. The difference in thermal conductivity of the material leads to prolonged heating time, which reduces production efficiency. In addition, the hot riveting process is difficult to automate, resulting in increased labor costs. For modern production that pursues energy conservation and emission reduction, this is a significant disadvantage. Hot riveting technology cannot realize the automated press-fitting of the impeller. Therefore, technical personnel in this field provide a new impeller assembly structure to solve the problems raised in the above background. Utility Model Content
[0005] The purpose of the utility model is to provide a novel impeller assembly structure to solve the problems raised in the above background technology.
[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:
[0007] A novel impeller assembly structure includes a casing, an impeller and a rotating shaft. The casing and the rotating shaft are rotatably connected, the impeller and the rotating shaft are transmission connected, the rotating shaft and the impeller are riveted, the impeller is located outside the casing, the rotating shaft is located inside the casing, a center hole is provided on the impeller, the center hole and the rotating shaft are riveted, an inlet hole is provided on the impeller, the inlet hole and the rotating shaft are abutted, a step is provided on the impeller, the step is used to complete the positioning of the impeller, the step is located far from the inlet hole, a positioning surface is provided on the step, and the positioning surface and the rotating shaft are abutted.
[0008] By adopting the above technical solution, through the setting of steps and positioning surfaces, the impeller can be quickly and accurately positioned during the riveting process with the rotating shaft, which significantly improves the assembly speed and reliability. First, the rotating shaft is installed inside the casing and connected to the casing for rotation. Then, the impeller is riveted to the rotating shaft through its hole. During this process, the inlet hole of the impeller abuts against the rotating shaft to ensure that the fluid can enter smoothly. The step design on the impeller, especially the positioning surface on the step, enables the impeller to automatically align with the correct position of the rotating shaft when the impeller is pressed. This not only speeds up the assembly speed, but also reduces the errors that may occur during the assembly process. This significantly improves the connection efficiency and quality between the impeller and the rotating shaft, ensuring the stable operation and high-efficiency performance of the motor. At the same time, because of the introduction of steps and positioning surfaces, manual errors in the assembly process are greatly reduced, and production efficiency is improved. In addition, this improvement reduces the dependence on high-temperature processes, adopts cold riveting industrial riveting, reduces production costs, and helps protect the safety of workers, avoiding the possible risk of scalding during hot riveting.
[0009] Furthermore, the rotating shaft is provided with straight knurling, and the outer diameter of the straight knurling is φ3.45 (+0.04, 0) mm.
[0010] By adopting the above technical solution, the assembly accuracy and efficiency of the new impeller assembly structure are enhanced by using a straight knurled shaft. The straight knurling on the shaft has a specific outer diameter specification of φ3.45 (+0.04, 0) mm. This precise size and shape of the straight knurling are crucial to achieving a tighter and more uniform riveted connection between the impeller and the shaft. Straight knurling provides an optimized contact surface, which not only increases the friction of the joint part, but also ensures that the impeller can slide smoothly over the shaft and accurately position during the assembly process. The shaft is first placed in the casing, and then the impeller slides through its center hole to the straight knurling part of the shaft for positioning. The design of straight knurling allows the impeller to form a firm interference fit with the shaft during the riveting process, which directly affects the operating efficiency and life of the motor to ensure that the impeller can achieve high-precision positioning during assembly, while simplifying the assembly process and improving production efficiency. The effect of this improvement is reflected in the rapidity and reliability of assembly. The use of straight knurling greatly improves the connection strength between the impeller and the shaft, and reduces the risk of failure caused by poor assembly. In addition, it also reduces the physical burden during the assembly process, because the shape of the straight grain makes it easier to install the impeller, thereby reducing the dependence on the worker's operating skills, achieving a higher degree of automated production, and effectively reducing labor costs. Overall, the shaft design of straight knurling improves connection quality, assembly efficiency and reduces production costs.
[0011] Furthermore, the center hole is φ3.2±0.05 mm.
[0012] By adopting the above technical solution, by setting the size of the impeller center hole to φ3.2±0.05mm, this fine adjustment matches the φ3.45(+0.04,0)mm straight knurling on the shaft, achieving higher precision matching and connection efficiency. This design optimization makes the riveting between the impeller and the shaft not only rely on the matching of external shapes, but also achieve the best matching at the micro level by precisely controlling the dimensional tolerance. The fine matching between the center hole and the straight knurling not only ensures the smooth transition of the impeller during the assembly process, but also improves the connection strength after riveting, thereby improving the reliability and durability of the entire motor device. In the workflow, the shaft with straight knurling design is first installed in the casing, and then the impeller The center hole is slid along the shaft to the appropriate position for riveting. The precise fit of the center hole and the straight knurling not only simplifies the assembly process, but also significantly improves the assembly speed and quality. This size matching reduces the adjustment and repositioning time required during assembly, and effectively avoids production defects caused by improper fit, thereby improving assembly accuracy, accelerating production speed and improving product quality while also reducing production costs. The fine fit of the center hole and the straight knurling of the shaft makes automated production possible, reduces dependence on manual operation, and thus reduces labor costs in the production process. In addition, by optimizing the connection structure, the design also increases the mechanical stability between the impeller and the shaft, extending the service life of the product.
[0013] Furthermore, the bottom diameter of the straight knurling is φ3.35 (+0.02, -0.01) mm.
[0014] By adopting the above technical solution, the straight knurling design is adopted on the shaft, and its bottom diameter is precisely set to φ3.35 (+0.02, -0.01) mm, which is carefully matched with the size of the impeller center hole φ3.2±0.05 mm, so as to achieve a high-precision interference fit between the impeller and the shaft, significantly optimize the assembly process, ensure the efficiency of the assembly process and the stability of the impeller after assembly.
[0015] The workflow for implementing this technical solution begins with the preparation of the shaft. The precise dimensions of the straight knurling on it provide ideal physical conditions for riveting. Next, the impeller slides into the straight knurling portion of the shaft through its center hole. Due to the precise interference fit between the center hole of the impeller and the bottom diameter of the straight knurling, the impeller can be automatically aligned and tightly riveted to the shaft during assembly without the need for additional adjustments, greatly improving assembly efficiency and achieving an optimized fit relationship, which not only ensures the simplicity of the assembly process, but also guarantees the mechanical properties and reliability of the components after assembly. The precise matching of the straight knurling and the center hole not only reduces production defects caused by improper assembly, but also improves the overall performance and life of the motor.
[0016] Furthermore, the hardness of the rotating shaft is ≥HRC45, and the impeller material is POM, which has self-lubricating properties and is easy to implement in the cold riveting process.
[0017] By adopting the above technical scheme, a shaft with a hardness ≥HRC45 and an impeller made of self-lubricating POM material are used to ensure the smooth implementation of the cold riveting process and the high performance of the final product. The high hardness of the shaft ensures its wear resistance and long-term durability during the impeller riveting process. The POM material is selected not only because of its good mechanical properties, but also because of its self-lubricating property, which greatly reduces the friction resistance during the assembly process and simplifies the riveting steps. The high-hardness shaft ensures that it will not be deformed or damaged when subjected to cold riveting pressure. Secondly, the self-lubricating property of the POM impeller enables the impeller to smoothly transition when in contact with the straight knurled part of the shaft without the need for additional lubrication, thereby simplifying the production process and improving assembly efficiency. The combination of a high-hardness shaft and a self-lubricating POM impeller provides ideal physical conditions for the cold riveting process, which not only ensures the high strength and durability of the connection part, but also realizes the high efficiency and low cost of the production process. Through this method, not only the reliability and life of the motor assembly are improved.
[0018] Furthermore, the impeller and the rotating shaft form a riveting cavity, and a chip storage groove is provided on the riveting cavity. The chip storage groove is used to store plastic chips, and the center hole and the rotating shaft are located on the same central axis.
[0019] By adopting the above technical solution, a chip storage groove is set in the riveting cavity surrounded by the impeller and the rotating shaft, thereby solving the problem of plastic chips generated during the cold riveting process, thereby maintaining the coaxiality of the center hole and the rotating shaft, and ensuring the high precision and high efficiency of the component. During the cold riveting and pressing process, the contact between the straight knurling of the rotating shaft and the POM impeller will produce tiny plastic chips. If these chips are not properly handled, they will affect the close connection between the impeller and the rotating shaft, and even cause coaxiality deviation. When the rotating shaft and the impeller are connected by cold riveting technology, any plastic chips generated will be effectively collected in the chip storage groove, which not only simplifies the production process and reduces subsequent cleaning work, but more importantly, improves the assembly quality and ensures the precise fit between the rotating shaft and the impeller, so that the cold riveted product has higher reliability and durability, while maintaining the cleanliness and efficiency of the assembly process.
[0020] Compared with the prior art, the beneficial effects achieved by the utility model are:
[0021] 1. The size of the impeller hole is adjusted so that it can be cold-riveted and pressed with the straight-grain knurled shaft. By adjusting the size of the impeller hole and changing to cold-riveted pressing, the efficiency is significantly improved, and the problem of cracking that may occur during riveting and pressing is prevented.
[0022] 2. At the same time, a special chip storage groove is added to the bottom of the impeller to store the plastic chips caused by the axial crimping of the shaft, ensuring the coaxiality of the impeller center hole and the shaft after crimping.
[0023] 3. The invention adds a step at the center hole of the impeller, so that the impeller can be positioned in advance during automatic press-fitting, avoiding the situation where the impeller is not pressed into place. Such an automatic press-fit impeller effectively reduces labor costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:
[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0026] Figure 2 This is a schematic diagram of the impeller structure of the utility model;
[0027] Figure 3 This is a schematic diagram of the straight knurling structure of the utility model;
[0028] Figure 4 This is a schematic diagram of the end surface structure of the straight knurled shaft of the utility model;
[0029] Figure 5 yes Figure 4 A partial enlarged view of part Ⅰ;
[0030] Figure 6 This is a schematic diagram of the riveting cavity structure of the utility model;
[0031] Figure 7 It is a schematic diagram of the chip storage groove structure of the utility model.
[0032] In the figure: 1, casing; 2, impeller; 21, middle hole; 22, inlet hole; 23, step; 231, positioning surface; 24, riveting cavity; 241, chip storage groove; 3, rotating shaft; 31, straight knurling. DETAILED DESCRIPTION
[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0034] See also Figure 1-7 , the utility model provides a technical solution:
[0035] A novel impeller assembly structure includes a casing 1, an impeller 2 and a rotating shaft 3. The casing 1 and the rotating shaft 3 are rotatably connected, the impeller 2 and the rotating shaft 3 are transmission connected, the rotating shaft 3 and the impeller 2 are riveted, the impeller 2 is located outside the casing 1, the rotating shaft 3 is located inside the casing 1, a center hole 21 is provided on the impeller 2, the center hole 21 and the rotating shaft 3 are riveted, an inlet hole 22 is provided on the impeller 2, the inlet hole 22 and the rotating shaft 3 are abutted, a step 23 is provided on the impeller 2, the step 23 is used to complete the positioning of the impeller 2, the step 23 is located at the edge of the inlet hole 22, a positioning surface 231 is provided on the step 23, and the positioning surface 231 and the rotating shaft 3 are abutted.
[0036] By adopting the above technical solution, the impeller 2 can be quickly and accurately positioned during the riveting process with the rotating shaft 3 through the arrangement of the step 23 and the positioning surface 231, which significantly improves the assembly speed and reliability. First, the rotating shaft 3 is installed inside the casing 1 and is rotatably connected with the casing 1. Then, the impeller 2 is riveted with the rotating shaft 3 through the hole 21 therein. During this process, the inlet hole 22 of the impeller 2 abuts against the rotating shaft 3 to ensure that the fluid can enter smoothly. The design of the step 23 on the impeller 2, especially the positioning surface 231 on the step 23, enables the impeller 2 to be pressed when the impeller 2 is pressed. It can automatically align the correct position of the shaft 3, which not only speeds up the assembly speed, but also reduces the errors that may occur during the assembly process, which significantly improves the connection efficiency and quality between the impeller 2 and the shaft 3, ensuring the stable operation and high-efficiency performance of the motor. At the same time, due to the introduction of the step 23 and the positioning surface 231, manual errors in the assembly process are greatly reduced, and production efficiency is improved. In addition, this improvement reduces the dependence on high-temperature processes, adopts cold riveting industrial riveting, reduces production costs, and helps protect the safety of workers, avoiding the risk of scalding during hot riveting.
[0037] Furthermore, the rotating shaft 3 is provided with a straight knurling 31, and the outer diameter of the straight knurling 31 is φ3.45 (+0.04, 0) mm.
[0038] By adopting the above technical solution, the assembly accuracy and efficiency of the new impeller assembly structure are enhanced by using the straight knurling 31 on the shaft 3. The straight knurling 31 on the shaft 3 has a specific outer diameter specification of φ3.45 (+0.04, 0) mm. This precise size and the shape of the straight knurling 31 are essential for achieving a tighter and more uniform riveted connection between the impeller 2 and the shaft 3. The straight knurling 31 provides an optimized contact surface, which not only increases the friction of the joint part, but also ensures that the impeller 2 can smoothly slide over the shaft 3 and be accurately positioned during the assembly process. The shaft 3 is first placed in the casing 1, and then the impeller 2 slides through its center hole to the straight knurling 31 of the shaft 3 for positioning. The design of the straight knurling 31 allows the impeller 2 to form a firm interference fit with the shaft 3 during the riveting process, which directly affects the operating efficiency and life of the motor, so as to ensure that the impeller 2 can achieve high-precision positioning during assembly, while simplifying the assembly process. The straight knurling 31 greatly improves the connection strength between the impeller 2 and the shaft 3, and reduces the risk of failure due to poor assembly. In addition, the physical burden in the assembly process is reduced because the straight shape makes it easier to install the impeller 2, thereby reducing the reliance on the workers' operating skills, achieving a higher degree of automated production, and effectively reducing labor costs. In general, the design of the shaft 3 with straight knurling 31 improves connection quality, assembly efficiency, and reduces production costs.
[0039] Furthermore, the center hole 21 is φ3.2±0.05 mm.
[0040] By adopting the above technical solution, by setting the size of the center hole 21 of the impeller 2 to φ3.2±0.05mm, this fine adjustment matches the φ3.45(+0.04,0)mm straight knurling 31 on the shaft 3, achieving higher precision matching and connection efficiency. This design optimization makes the riveting between the impeller 2 and the shaft 3 not only rely on the matching of external shapes, but also achieve the best matching at the micro level by accurately controlling the dimensional tolerance. The fine matching between the center hole 21 and the straight knurling 31 not only ensures the smooth transition of the impeller 2 during the assembly process, but also improves the connection strength after riveting, thereby improving the reliability and durability of the entire motor device. In the workflow, firstly, the shaft 3 designed with straight knurling 31 is installed in the casing 1, and then the impeller 2 is riveted. The wheel 2 slides along the shaft 3 to the appropriate position through its hole 21 for riveting. The precise fit between the center hole 21 and the straight knurling 31 not only simplifies the assembly process, but also significantly improves the assembly speed and quality. This size matching reduces the adjustment and repositioning time required during assembly, and effectively avoids production defects caused by improper fit, thereby improving assembly accuracy, accelerating production speed and improving product quality while also reducing production costs. The precise fit between the center hole 21 and the straight knurling 31 on the shaft 3 provides the possibility for automated production, reduces dependence on manual operation, and thus reduces labor costs in the production process. In addition, by optimizing the connection structure, the design also increases the mechanical stability between the impeller 2 and the shaft 3, and extends the service life of the product.
[0041] Furthermore, the bottom diameter of the straight knurling 31 is φ3.35 (+0.02, -0.01) mm.
[0042] By adopting the above technical solution, by adopting the straight knurling 31 design on the rotating shaft 3, its bottom diameter is accurately set to φ3.35 (+0.02, -0.01) mm, which is carefully matched with the size of the hole 21φ3.2±0.05 mm in the impeller 2, a high-precision interference fit between the impeller 2 and the rotating shaft 3 is achieved, the assembly process is significantly optimized, and the efficiency of the assembly process and the stability of the impeller 2 after assembly are ensured.
[0043] The workflow for implementing this technical solution begins with the preparation of the shaft 3. The precise size of the straight knurling 31 thereon provides ideal physical conditions for riveting. Then, the impeller 2 slides into the straight knurling 31 of the shaft 3 through its center hole 21. Due to the precise interference fit between the center hole 21 of the impeller 2 and the bottom diameter of the straight knurling 31, the impeller 2 can be automatically aligned and tightly riveted to the shaft 3 during assembly without the need for additional adjustments, which greatly improves the assembly efficiency and achieves an optimized matching relationship, ensuring both the simplicity of the assembly process and the mechanical properties and reliability of the components after assembly. The precise matching of the straight knurling 31 and the center hole 21 not only reduces production defects caused by improper assembly, but also improves the overall performance and life of the motor.
[0044] Furthermore, the hardness of the rotating shaft 3 is ≥HRC45, and the material of the impeller 2 is POM, which has self-lubricating properties and is easy to implement the cold riveting process.
[0045] By adopting the above technical scheme, a shaft 3 with a hardness ≥HRC45 and an impeller 2 made of self-lubricating POM material are used to ensure the smooth implementation of the cold riveting process and the high performance of the final product. The high hardness of the shaft 3 ensures its wear resistance and long-term durability during the riveting process of the impeller 2. The POM material is selected not only because of its good mechanical properties, but also because of its self-lubricating property, which greatly reduces the friction resistance during the assembly process and simplifies the riveting steps. The high hardness of the shaft 3 ensures that it will not be deformed or damaged when subjected to cold riveting pressure. Secondly, the self-lubricating property of the POM impeller 2 enables the impeller 2 to smoothly transition when contacting the straight knurling 31 of the shaft 3 without additional lubrication, thereby simplifying the production process and improving the assembly efficiency. The combination of the high hardness shaft 3 and the self-lubricating POM impeller 2 provides ideal physical conditions for the cold riveting process, which not only ensures the high strength and durability of the connection part, but also realizes the high efficiency and low cost of the production process. Through this method, not only the reliability and life of the motor assembly are improved.
[0046] Furthermore, the impeller 2 and the rotating shaft 3 form a riveting cavity 24, and a chip storage groove 241 is provided on the riveting cavity 24. The chip storage groove 241 is used to store plastic chips. The center hole 21 and the rotating shaft 3 are located on the same central axis.
[0047] By adopting the above technical solution, a chip storage groove 241 is set in the riveting cavity 24 surrounded by the impeller 2 and the rotating shaft 3, so as to solve the problem of plastic chips generated during the cold riveting process, thereby maintaining the coaxiality of the center hole 21 and the rotating shaft 3, and ensuring the high precision and high efficiency of the component. During the cold riveting and pressing process, the contact between the straight knurling 31 of the rotating shaft 3 and the POM impeller 2 will produce tiny plastic chips. If these chips are not properly handled, they will affect the close combination of the impeller 2 and the rotating shaft 3, and even cause coaxiality deviation. When the rotating shaft 3 and the impeller 2 are connected by cold riveting technology, any plastic chips generated will be effectively collected in the chip storage groove 241, which not only simplifies the production process and reduces the subsequent cleaning work, but more importantly, improves the assembly quality and ensures the precise fit between the rotating shaft 3 and the impeller 2, so that the cold riveted product has higher reliability and durability, while maintaining the cleanliness and efficiency of the assembly process.
[0048] The working principle of this utility model:
[0049] First, by designing a structure with a step 23 and a positioning surface 231 on the impeller 2, the impeller 2 can be quickly and accurately positioned during the riveting process with the shaft 3, which not only speeds up the assembly speed, but also significantly reduces the errors that may occur during the assembly process. Secondly, the straight knurling 31 design adopted by the shaft 3, combined with the size of the center hole 21 of the impeller 2, further ensures a tight and uniform riveted connection between the impeller 2 and the shaft 3. This design optimizes the contact surface, increases friction, and ensures that the impeller 2 can smoothly slide over the shaft 3 and accurately position itself during the assembly process. In addition, the high hardness of the shaft 3 combined with the self-lubricating properties of the POM material of the impeller 2 not only ensures the smooth progress of the assembly process, but also realizes an efficient production process. Finally, a chip storage groove 241 is provided in the riveting cavity 24 surrounded by the impeller 2 and the rotating shaft 3, which effectively collects plastic chips generated during the cold riveting process, thereby preventing the plastic chips from affecting the tight connection and coaxiality of the impeller 2 and the rotating shaft 3, thereby ensuring high precision and mechanical stability after assembly. It not only significantly improves production efficiency and assembly quality, reduces production costs, but also improves product reliability and durability. In addition, it promotes the realization of automated production, reduces dependence on manual operations, and further reduces labor costs.
[0050] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or still includes elements inherent to such process, method, article or device.
[0051] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A new impeller assembly structure, characterized in that: The novel impeller assembly structure comprises a casing (1), an impeller (2) and a rotating shaft (3); the casing (1) and the rotating shaft (3) are rotatably connected; the impeller (2) and the rotating shaft (3) are transmission-connected; the rotating shaft (3) and the impeller (2) are riveted; the impeller (2) is located outside the casing (1); the rotating shaft (3) is located inside the casing (1); a center hole (21) is provided on the impeller (2); the center hole (21) and the rotating shaft (3) are riveted; an inlet hole (22) is provided on the impeller (2); the inlet hole (22) and the rotating shaft (3) are in contact; a step (23) is provided on the impeller (2); the step (23) is used for positioning the impeller (2); the step (23) is located at the edge of the inlet hole (22); a positioning surface (231) is provided on the step (23); the positioning surface (231) and the rotating shaft (3) are in contact.
2. A novel impeller assembly structure according to claim 1, characterized in that: The rotating shaft (3) is provided with a straight knurling (31), and the outer diameter of the straight knurling (31) is φ3.45 (+0.04, 0) mm.
3. A novel impeller assembly structure according to claim 1, characterized in that: The central hole (21) is φ3.2±0.05 mm.
4. A novel impeller assembly structure according to claim 2, characterized in that: The bottom diameter of the straight knurling (31) is φ3.35 (+0.02, -0.01) mm.
5. A novel impeller assembly structure according to claim 1, characterized in that: The hardness of the rotating shaft (3) is ≥HRC45, and the material of the impeller (2) is POM.
6. A novel impeller assembly structure according to claim 1, characterized in that: The impeller (2) and the rotating shaft (3) form a riveting cavity (24), and a chip storage groove (241) is provided on the riveting cavity (24). The chip storage groove (241) is used to store plastic chips. The center hole (21) and the rotating shaft (3) are located on the same central axis.