A hand wheel and fan blade integrated device

Abstract

The utility model discloses a hand wheel fan leaf integrated device, including the following steps: step 100, hand wheel fan leaf performance topology design, step 200, hand wheel fan leaf performance parameter design, step 300, hand wheel main body strength design, adopt CFD simulation method to carry out integrated simulation analysis to hand wheel and fan leaf, have adopted parameterization optimization method and greatly promoted multi -parameter simulation optimization efficiency, will parameter modeling, mesh division, simulation calculation, optimization iteration etc. process carries out integrated automation, utilizes computer to complete a large amount of parameterization optimization work automatically, looks for relevant parameter, finally combines CAE strength simulation with CFD simulation, guarantees the multidisciplinary performance and feasibility of hand wheel fan leaf.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine handwheel technology, specifically relating to a handwheel fan blade integrated device. Background Technology

[0002] The current functions of the sewing machine handwheel are: 1. To transmit torque during manual adjustment to make the machine run; 2. To use the rotation of the spindle to drive the handwheel to rotate at high speed during normal operation to generate airflow to cool the machine casing, motor, and electronic control system.

[0003] The handwheel must meet the requirements for appearance and strength, and also maintain sufficient air delivery capacity to meet the machine's needs for air volume and air pressure.

[0004] In existing technology, a common practice is to integrate fan blades onto the handwheel, and there are two specific methods:

[0005] like Figure 18 One method involves directly rooting the fan blades onto the inner side of the handwheel disc. The handwheel and axial fan blades are die-cast and molded as a single unit. Although this method has good strength, the suction surface of the fan blades is blocked by the perforated plate of the disc when the fan blades are demolded, causing the suction surface of the fan blades to be demolded from the reverse side along the axial direction. As a result, the fan blade flow channel is diffused in the airflow direction, resulting in a very weak heat dissipation effect.

[0006] like Figure 19 Another option is to design separate fan blades and integrate them into the handwheel. However, this often results in a significant decrease in fan performance and an inability to achieve the desired heat dissipation. In addition, the plastic fan blades experience increased tip vibration under such complex airflow, rubbing against the outer ring of the handwheel and causing abnormal noises.

[0007] The above phenomenon occurs because the fan blades are integrated into the handwheel, and the working environment is completely different from that of normal fan blades. The handwheel also rotates synchronously with the fan blades. Therefore, conventional fan blade structures only optimize the structural parameters of the fan blades themselves, without considering the impact of the handwheel rotation. Utility Model Content

[0008] This utility model aims to provide a handwheel fan blade integrated device, which is designed for scenarios where the handwheel and fan blades rotate synchronously. It achieves a handwheel fan integrated structure that balances strength and high performance, large air volume, high air pressure and low noise. Through optimization of the strength of the handwheel body, optimization of the performance topology of the handwheel fan blades, and automatic optimization of the handwheel fan blade integration parameters, an integrated structure with good heat dissipation performance is obtained.

[0009] This application provides a handwheel and fan blade integrated device, including a handwheel and a fan blade, which are nested together and coaxially arranged;

[0010] The handwheel includes a bushing, a wheel disc, a raised cylinder, and a wheel cylinder; the bushing and the wheel cylinder are concentrically arranged, and the wheel disc is arranged between the bushing and the wheel cylinder.

[0011] The wheel is provided with a fan-shaped elongated oval hole, and the two ends of the hole wall at different radial positions maintain a specified forward tilt angle, with the hole angle gradually increasing radially outward;

[0012] The handwheel and fan impeller are connected by threaded parts;

[0013] The fan impeller includes an outer cylinder, an inner cylinder, and fan blades. The outer and inner cylinders are arranged concentrically, and 5-7 fan blades are arranged in a ring between the inner and outer cylinders.

[0014] The inner cylinder is fitted with a bushing, and the outer cylinder is fitted with a wheel cylinder.

[0015] From the base to the tip of the fan blade, the chord length increases.

[0016] The technical solution provided in this application also has the following technical features:

[0017] Preferably, in one embodiment of this application, the blade thickness of the impeller ranges from 0.1 to 3 mm.

[0018] Preferably, in one embodiment of this application, the blade thickness of the impeller is 1.5 mm.

[0019] Preferably, in one embodiment of this application, the impeller has 6 blades.

[0020] Preferably, in one embodiment of this application, radial ribs are provided between the bushing and the wheel cylinder, and are arranged in an arc shape.

[0021] Preferably, in one embodiment of this application, the windward side of the radial rib is tilted backward to maintain the maximum draft angle.

[0022] Preferably, in one embodiment of this application, the handwheel has an annular array of protruding cylinders in the axial direction, and the inner cavity of the protruding cylinders is provided with internal threads for installing threaded parts to connect the handwheel and the fan impeller;

[0023] A positioning cylinder is provided at the root of some fan blades to match the protruding cylinder. The positioning cylinder is used to insert into the protruding cylinder and to abut against and limit the protruding cylinder.

[0024] Preferably, in one embodiment of this application, the handwheel is embedded inside the outer cylinder of the fan impeller via a wheel cylinder; the wheel cylinder is provided with a positioning hole I, and the outer cylinder is provided with a positioning hole II;

[0025] Positioning holes I and II are matched to align and connect the handwheel and fan impeller into a single unit. Positioning holes I or II are provided with internal threads.

[0026] Preferably, in one embodiment of this application, the thickness of the fan blade increases from the tip to the outer edge of the blade.

[0027] Preferably, in one embodiment of this application, the blade tip is provided with an extension portion to increase the blade chord length.

[0028] Preferably, in one embodiment of this application, a rectangular groove is provided at the outer end of the outer cylinder facing the handwheel.

[0029] Preferably, in one embodiment of this application, a positioning block is provided on the bushing, and a positioning groove is provided on the inner cylinder. The positioning block is embedded in the positioning groove for limiting the position.

[0030] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

[0031] This application, through simulation optimization, yields a precisely improved integrated handwheel and fan blade device, which increases airflow per unit speed and effectively reduces temperature rise in key parts of the sewing machine.

[0032] The fan blade structure was optimized and the handwheel was improved accordingly, which improved both airflow and fan blade work. Through iterative optimization of materials and thickness, the energy-saving effect was good, the cooling effect was good, and the aerodynamic performance of the blades was improved simultaneously.

[0033] The improvements in this application are based on simulation calculations. Through automated iterative simulation, the integrated CFD performance of the handwheel fan blades and the CAE strength of the handwheel are fully verified, resulting in a significant improvement in performance targets. Attached Figure Description

[0034] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0035] Figure 1 This is a structural diagram of a handwheel fan blade integrated device according to the present invention;

[0036] Figure 2 This is one embodiment of the wheel with a circular hole according to the present invention;

[0037] Figure 3 This is a second embodiment of the present invention, which involves opening an elongated waist hole in the wheel.

[0038] Figure 4 This is a third embodiment of the present invention for reducing the airflow angle of the fan blades;

[0039] Figure 5 Streamline diagram of the relative circumferential velocity at the blade tip under zero differential pressure condition for Scheme 1, which involves opening a circular hole in the wheel disk;

[0040] Figure 6 Streamline diagram of the circumferential relative velocity at the blade tip under zero differential pressure condition for Scheme 2, which involves opening an elongated oblong hole in the impeller.

[0041] Figure 7 The streamline diagram of the circumferential relative velocity at the blade tip under zero pressure difference condition for Scheme 3 of reducing the airflow angle of the fan blade;

[0042] Figure 8 This is a schematic diagram of the tilted opening of the wheel according to an embodiment of the present invention;

[0043] Figure 9 A three-dimensional wheel cover and fan blade integrated in one embodiment of the present invention Figure 1 ;

[0044] Figure 10 A three-dimensional wheel cover and fan blade integrated in one embodiment of the present invention Figure 2 ;

[0045] Figure 11 Optimize the stress distribution on the front of the handwheel for the fan blade mounting bracket structure;

[0046] Figure 12 Optimize the stress distribution on the reverse side of the front handwheel for the fan blade mounting bracket structure;

[0047] Figure 13 After optimizing the structure of the fan blade mounting base, the stress distribution on the front of the handwheel was improved.

[0048] Figure 14 After optimizing the structure of the fan blade mounting base, the stress distribution on the reverse side of the handwheel was improved.

[0049] Figure 15 This is a design flowchart of a handwheel fan blade integrated device according to the present invention;

[0050] Figure 16 This is a flow field diagram of a handwheel fan blade integrated structure according to an embodiment of the present invention;

[0051] Figure 17 This is a comparison diagram of the flow-pressure differential aerodynamic characteristics of the handwheel fan blade integrated structure according to an embodiment of this utility model;

[0052] Figure 18 Existing technology: die-casting molding diagram of handwheel and axial flow fan blade as a single unit;

[0053] Figure 19 A schematic diagram of a separate fan blade integrated into a handwheel in existing technology;

[0054] Components in the diagram:

[0055] 100. Handwheel

[0056] 101. Protruding cylinder

[0057] 102. Roulette

[0058] 103. Positioning Block

[0059] 104. Wheel cylinder

[0060] 300. Fan impeller

[0061] 301. Outer cylinder

[0062] 302. Rectangular groove

[0063] 303, Inner Cylinder

[0064] 304, positioning groove

[0065] 305. Positioning cylinder

[0066] 306. Leaf base

[0067] 308. Leaf tip

[0068] 309. Outer margin of leaf

[0069] 200, bushing

[0070] 400. Screws

[0071] 500, internal screw. Detailed Implementation

[0072] The specific embodiments of this application will be further described in detail below with reference to the accompanying drawings. These embodiments are only for illustrating this application and are not intended to limit the scope of this utility model.

[0073] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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 on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0074] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0075] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0076] like Figure 1 A handwheel-fan blade integrated device includes a handwheel 100 and a fan blade 300, wherein the handwheel 100 and the fan blade 300 are nested together and coaxially arranged;

[0077] The handwheel 100 includes a bushing 200, a wheel disc 102, a raised cylinder 101, and a wheel cylinder 104; the bushing 200 and the wheel cylinder 104 are concentrically arranged, and the wheel disc 102 is arranged between the bushing 200 and the wheel cylinder 104;

[0078] The wheel 102 is provided with a fan-shaped elongated oval hole, and the two ends of the hole wall at different radial positions maintain a specified forward tilt angle, with the hole angle gradually increasing radially outward;

[0079] The handwheel 100 and the fan impeller 300 are connected by a threaded component, which is a screw 400.

[0080] The fan impeller 300 includes an outer cylinder 301, an inner cylinder 303, and fan blades. The outer cylinder 301 and the inner cylinder 303 are arranged concentrically, and 5-7 fan blades are arranged in a ring between the inner cylinder 303 and the outer cylinder 301.

[0081] The inner cylinder 303 is fitted with a bushing 200, and the outer cylinder 301 is fitted with a wheel cylinder 104.

[0082] From the base to the tip of the fan blade, the chord length increases;

[0083] This application achieves a targeted optimized parameter structure by conducting thorough topology optimization, performance parameter optimization, and main body strength optimization of the handwheel fan blades during the design process, thereby obtaining a handwheel fan blade integrated device with significantly improved performance.

[0084] Simulation results from this application show that the internal flow field structure is smooth, with no obvious separation of secondary flows, and the flow field structure is relatively stable.

[0085] Its performance improvement is as follows: maximum flow rate increased from 5.9m³ / s. 3 / h increased to 29.6m 3 / h, the maximum differential pressure increased from 30Pa to 49Pa, and the performance was significantly improved;

[0086] Specifically, in one embodiment of this application, the blade thickness of the impeller 300 ranges from 0.1 to 3 mm, and the blade thickness is preferably 1.5 mm; the impeller 300 has 6 blades; radial ribs are provided between the bushing 200 and the wheel cylinder 104, and are arranged in an arc shape; the windward side of the radial ribs is tilted backward to maintain the maximum draft angle; the handwheel 100 has an annular array of protruding cylinders 101 in the axial direction, and the inner cavity of the protruding cylinders 101 is provided with internal threads for installing threaded parts to connect the handwheel 100 and the impeller 300;

[0087] A positioning cylinder 305 is provided at the root of some fan blades to match the protruding cylinder 101. The positioning cylinder 305 is used to insert into the protruding cylinder 101 and abut against and limit the protruding cylinder 101. The handwheel 100 is embedded in the inner cylinder 301 of the fan impeller 300 through the wheel cylinder 104. The wheel cylinder 104 is provided with positioning hole I, and the outer cylinder 301 is provided with positioning hole II.

[0088] Positioning holes I and II are matched to align and connect handwheel 100 and fan impeller 300 into a single unit. Positioning holes I or II are provided with internal threads and are fastened with internal screws 500.

[0089] The thickness of the fan blade increases from the tip 308 to the outer edge 309; a rectangular groove 302 is provided on the outer end of the outer cylinder 301 facing the handwheel 100; a positioning block 103 is provided on the bushing 200, and a positioning groove 304 is provided on the inner cylinder 303. The positioning block 103 is embedded in the positioning groove 304 for limiting the position; an extension is provided at the tip of the fan blade to increase the chord length of the fan blade.

[0090] Specifically, in one embodiment of this application, a handwheel-fan blade integrated device is suitable for scenarios where the handwheel and fan blades rotate synchronously. Based on certain design boundaries, such as a rotational speed of 4000±800 RPM, a handwheel outer diameter of 80±16 mm, and a thickness of 30±6 mm, it can effectively improve wind pressure and air volume while suppressing noise levels.

[0091] The structure is as follows: the fan is fixed axially inside the handwheel, and the central bushing of the handwheel is installed on the machine spindle by a set screw;

[0092] Load and operating conditions: When debugging the machine, the outer ring of the handwheel needs to bear a rotational torque of 25±5 N·m, which is transmitted to the main shaft through the wheel mechanism, temporarily replacing the motor to drive the machine. During normal operation, the motor drives the main shaft to rotate 4000±800 RPM, which drives the handwheel and fan blades to rotate synchronously. The rotation of the fan blades will drive the airflow through the opening of the rotating wheel, replenishing fresh air. Ultimately, the external airflow is continuously drawn into the handwheel and guided to the components that need heat dissipation through the air shield, with the goal of maximizing airflow and air pressure and minimizing noise.

[0093] The design and implementation process of this application is as follows: Figure 15 The process includes the following steps: topology optimization of handwheel blade performance, optimization of handwheel blade performance parameters, and optimization of handwheel body strength.

[0094] The topology optimization of handwheel fan blade performance includes the following steps:

[0095] Parametric integrated 3D modeling;

[0096] Handwheel fan blade integrated CFD performance calculation;

[0097] Result analysis and forward design;

[0098] For the topology optimization of the handwheel fan blades, adjust the parametric integrated 3D modeling and repeat the above steps until the topology optimization requirements are met.

[0099] A topology optimization scheme for the handwheel fan blade performance was obtained;

[0100] Optimizing the performance parameters of the handwheel fan blades includes the following steps:

[0101] A parameter sensitivity analysis was performed on the obtained topology optimization scheme for the handwheel fan blade performance.

[0102] Design space and DOE design;

[0103] Handwheel fan blade integrated CFD performance calculation;

[0104] Automatic optimization of multi-objective parameters, return to adjust the design space and DOE design, repeat the above steps until the requirements for automatic optimization of multi-objective parameters are met;

[0105] Obtain an optimized performance parameter scheme for the handwheel fan blades;

[0106] The handwheel body strength optimization includes the following steps:

[0107] Detailed 3D modeling of the exterior and craftsmanship;

[0108] CAE strength calculation of handwheel;

[0109] To optimize handwheel strength, return to the CAE strength calculation for adjusting the handwheel and repeat the above steps until the handwheel strength optimization requirements are met.

[0110] After verifying the pneumatic performance, return to the adjustment handwheel strength optimization and repeat the above steps until the pneumatic performance verification requirements are met.

[0111] The final optimized solution was obtained;

[0112] The topology optimization method for handwheel fan blade performance is as follows:

[0113] 1. Parametric Integrated 3D Modeling: Based on dimensional boundaries, the handwheel has an outer diameter of 80mm and a thickness of 30mm. A preliminary integrated assembly model of the handwheel blades is established, while the relevant structures of the handwheel blades are adjusted for comparative analysis.

[0114] 2. Construct a virtual wind tunnel model of the handwheel and fan blade integrated assembly to conduct CFD performance calculations and evaluate the aerodynamic performance of the handwheel. The wind tunnel diameter is approximately 2-3 times the handwheel diameter, the distance from the inlet to the handwheel is approximately 4 times the handwheel diameter, and the distance from the outlet to the handwheel is approximately 6 times the handwheel diameter. The inlet and outlet sections are separated at the handwheel, and corresponding discrete mesh models are established. The multi-coordinate system (MRF) with the lowest computational cost is used to set the rotating region, which must include both the handwheel and the fan blade. The same atmospheric pressure is given to the inlet and outlet to calculate the maximum flow rate. The inlet is given 0 flow rate, and the outlet is given atmospheric pressure to calculate the maximum pressure difference. CFD flow field multi-condition calculations are carried out to monitor the inlet and outlet flow rate and pressure difference parameters and obtain the flow rate-pressure performance curve.

[0115] 3. Visualize the above calculation results at the blade tip, middle, and root to observe and analyze the details of the internal flow field, especially the process of airflow flowing into and out of the fan blade through the impeller, as well as the development of flow separation. Propose structural topology optimization directions to suppress airflow separation, increase the work capacity of the fan blade, and improve the suction of the fan blade.

[0116] 4. Confirm the current performance of the handwheel and fan blades. If it does not meet the requirements, modify the parametric model of the fan blade and handwheel topology based on the structural optimization direction, and continue CFD modeling, calculation, and evaluation; obtain the following results: Figure 2 , 3 Scheme 4 was proposed, and the following results were obtained: Figure 5 , 6 7 corresponds to the streamline diagram of the circumferential relative velocity at the blade tip under the 0 differential pressure condition;

[0117] 5. Continue until the flow field structure is significantly improved and the performance is significantly enhanced, thus obtaining a topology optimization scheme.

[0118] A comparison of the aerodynamic performance of three schemes—Scheme 1 with a circular hole in the wheel, Scheme 2 with an elongated hole in the wheel, and Scheme 3 with a reduced airflow angle in the fan blade—is shown in Table 1.

[0119]

[0120] For example, a comparison of the effects of orifice type and fan blade airflow angle reveals:

[0121] 1. The flow rate and pressure are significantly reduced when using a circular orifice compared to a waisted orifice. Flow field analysis revealed that the airflow needs to be pre-swirled before entering the impeller. This pre-selection will cause an impact with the circumferential wall of the axial orifice, resulting in separated flow and further reducing the effective orifice area. Even with the same orifice area, the impact area generated by the circular orifice is much larger than that of the waisted orifice, which greatly reduces the effective airflow area and results in a significant decrease in both flow rate and pressure difference.

[0122] Adjusting technical measures: such as Figure 8 The opening should adopt a fan-shaped, oval-shaped disc opening method as much as possible, and the two ends of the hole wall at different radial positions should maintain a certain forward tilt angle. The angle of each hole gradually increases radially outward. The advantage is that it can reduce the angle of attack between the disc opening wall and the airflow at different positions, increase the effective passage area, and reduce the obstruction effect of the disc opening wall on the airflow.

[0123] 2. Theoretically, a smaller airflow angle leads to a higher axial velocity and a larger total flow rate. However, reducing the airflow angle here does not increase the flow rate; instead, insufficient suction can cause channel blockage, resulting in large-area secondary flow and decreased aerodynamic performance. The fundamental reason is that, with the same number of blades, a larger airflow angle can increase the fan blade's suction (axial thrust). However, an excessively large airflow angle not only causes blade overlap, making it difficult to achieve the desired mold opening (requiring a reduction in the number of blades and fan blade thickness to ensure normal demolding), but also reduces the blade's workability. For such important and mutually restrictive aerodynamic structural parameters, subsequent parametric optimization of the relevant parameters is necessary. This also indicates the need to move beyond the original structural characteristics and take special measures to improve the fan blade's workability and suction, thereby reducing the airflow angle and increasing the fan blade's maximum flow rate.

[0124] Adjusting technical measures: such as Figure 9 , 10 To enhance the working capacity of the fan blades, the wheel cover and fan blades are first integrated into one unit, while the outlet side is opened to give it the channel characteristics of a centrifugal impeller, thereby improving air intake capacity and reducing the fan blades' dependence on the airflow angle. Secondly, the thickness of the fan blade tip is increased to increase the tip chord length and amplify the working capacity of the blade tip, storing the potential for a comprehensive increase in air pressure and air volume. Finally, the leading edge of the fan blade adopts a forward-curved structure, which can further increase the flow rate compared to a backward-curved structure, but the stability is insufficient, requiring careful matching between parameters during subsequent multi-parameter optimization.

[0125] The goal of topology optimization is to address the problems in the original flow field structure. Based on the forward design concept, it breaks through the characteristics of the original structure and proposes that topology optimization can significantly improve the optimization potential.

[0126] The following methods can be used to optimize the performance parameters of the handwheel fan blades:

[0127] 1. Based on the three-dimensional model of the topology optimization scheme for the handwheel fan blade obtained by the above steps, relevant parameters such as the circumferential position of the handwheel disc opening, structural parameters affecting the airflow angle of the fan blade inlet, structural parameters affecting the airflow angle of the fan blade outlet, the degree of forward bending of the leading edge of the blade, the degree of forward tilt of the trailing edge of the blade, the degree of backward bending of the trailing edge of the blade, and the thickness of the fan blade are adjusted and analyzed and compared to complete the parameter sensitivity analysis.

[0128] 2. Based on the above analysis of parameter sensitivity, select some key parameters that are relatively sensitive and have room for adjustment as the parameters to be parameterized and optimize, and determine the range as the optimization design space. Based on this, conduct orthogonal experimental design and determine the sample size.

[0129] 3. Following the steps of building a virtual wind tunnel model of the integrated assembly of handwheel fan blades using the topology optimization method for handwheel fan blade performance, select free blowing as the working condition and conduct CFD wind tunnel performance calculations.

[0130] 4. Automatic modeling, mesh generation calculation, numerical solution calculation, and optimization iteration calculation are performed on the sample space and the combination of handwheel fan blade parameters during the optimization iteration process. The objective function is set to maximize the outlet flow rate while minimizing the fluctuation of the outlet flow rate.

[0131] 5. Select the solution with the largest traffic volume and the lowest fluctuation as the final design solution;

[0132] Sensitivity analysis during the optimization process revealed that:

[0133] 1. The thinner the blade, the better the aerodynamic performance. However, in order to meet the basic strength requirements, the blade thickness of this application is designed to be 1.5mm.

[0134] 2. Flow rate, air pressure, and stability are often in conflict. Improving the former often leads to increased instability, requiring further optimization of relevant parameters to enhance aerodynamic stability. Among these, the circumferential tilt angle of the handwheel opening and the forward bend of the fan blades can effectively improve flow rate and air pressure, but at the expense of stability. Conversely, the forward tilt and backward bend of the blade trailing edge can increase stability, but at the expense of flow rate and air pressure performance.

[0135] 3. The circumferential relative angle between the handwheel opening and the leading edge of the fan blade has a significant impact on the aerodynamic stability of the integrated handwheel and fan blade;

[0136] The performance parameters of the handwheel fan blades are optimized by adjusting multiple parameters simultaneously and defining the design space. Through parametric modeling, process-oriented calculation, sample design, and optimization algorithms, a large number of optimization iterations are completed accurately and automatically, reducing the amount of manual optimization work and improving the efficiency of optimization.

[0137] The strength of the handwheel body is optimized using the following method:

[0138] 1. Explicit Input of Appearance, Process and Assembly: Process Scheme: Handwheel and fan blade are molded separately and demolded along the axial direction, so the axial projection contours cannot overlap; Installation Method: Fan blade is installed axially and handwheel is installed radially, so installation space must be reserved, which will limit the number of blades and related angles.

[0139] 2. Based on the above explicit design inputs and appearance requirements, perform integrated modeling of parametric handwheel and fan, control wall thickness distribution, and open ventilation holes and reinforcing ribs on the wheel;

[0140] 3. Preprocess the above integrated 3D model, build a finite element mesh model for strength verification, and apply rotational torque to verify the strength of the material.

[0141] 4. Based on the calculation results, adjust the opening size, stiffener size, and wall thickness at various locations to optimize the structure at local locations and eliminate stress concentration, etc.

[0142] 5. Once the calculation results meet the material yield strength, complete the handwheel strength optimization.

[0143] The strength of the handwheel body needs to be optimized, taking into account the mold forming and installation requirements of the handwheel. Due to the installation space requirements, the fan blades have been changed from 7 blades to 6 blades.

[0144] like Figure 11 , 12 Figures 13 and 14 show a comparison of the stress distribution of the handwheel body before and after the optimization of the fan blade mounting base structure. After optimization, the stress concentration phenomenon of the handwheel is eliminated, and the stress distribution is more uniform.

[0145] To improve the strength of the handwheel, radial ribs are generated on the inner side of the handwheel, avoiding the hole locations, running from the center to the top of the wheel. These ribs are tilted backwards facing the windward side to maintain a large draft angle. CFD simulations were used to evaluate the performance impact of this structure, and calculations showed that this design can reduce the obstruction of airflow by the rib sidewalls while ensuring strength.

[0146] After three rounds of optimization, the final integrated design structure of the handwheel fan blades and the flow field structure are as follows: Figure 1 , 16 ;

[0147] The results show that the internal flow field structure is smooth, with no obvious separation of secondary flow, and the flow field structure is relatively stable.

[0148] Its performance improvement is as follows: maximum flow rate increased from 5.9m³ / s. 3 / h increased to 29.6m 3 / h, the maximum differential pressure increased from 30Pa to 49Pa, and the performance was significantly improved; see Table 2;

[0149] The performance improvement effects of the optimized design are as follows:

[0150]

[0151] A comparison of flow-pressure differential aerodynamic characteristics can be found in [link to relevant documentation]. Figure 17 ;

[0152] In summary, the technical solution of this embodiment has the following technical features:

[0153] 1. This handwheel and fan blade integrated device differs from traditional design schemes and methods. During the development of the handwheel and fan blade, the handwheel and fan blade are integrated and optimized through simulation, which fully considers the influence of the handwheel rotation on the fan blade, resulting in higher simulation reliability.

[0154] 2. The design of this utility model uses CFD simulation technology to analyze the flow mechanism of the two matching each other, and proposes effective topology optimization directions. It breaks away from the traditional fan blade topology structure and proposes new improvement directions, which greatly enhances the performance optimization potential.

[0155] 3. This technical solution integrates and automates processes such as parametric modeling, mesh generation, simulation calculation, and optimization iteration, utilizing computers to automatically complete a large amount of parametric optimization work, thus significantly improving work efficiency;

[0156] 4. The design of this utility model solves the problem of mutual interference caused by the synchronous rotation of the handwheel and the fan blade from the root. At the same time, it was developed without changing the basic framework of the handwheel size boundary, air intake method and rotation speed. It has the characteristics of high performance, low noise, small size and low cost.

[0157] 5. During the CFD fluid simulation optimization process, CAE strength simulation was also used to verify and optimize the main structure of the handwheel, ensuring that the design scheme meets the performance requirements of multiple disciplines.

[0158] Specifically, in one embodiment of this application, the structure of the external handwheel can also achieve ideal heat dissipation, and the integrated design structure of the wheel opening and the high-efficiency silent fan blade can also be combined with the following technical measures to improve performance;

[0159] 1. Changes in handwheel material, such as using high-strength materials to make the handwheel body, can increase the opening area and thickness of the wheel disc while ensuring strength, thereby reducing the wheel disc's wind resistance, but this will affect the appearance and cost;

[0160] 2. Increasing the design boundaries of the handwheel, such as increasing the diameter of the fan blades, changing the axial flow to a centrifugal or mixed flow structure, can also improve the fan blade wind power and air volume, but it often increases noise and also affects the overall layout and outline dimensions of the machine.

[0161] 3. Increasing the handwheel speed through a variable speed transmission structure generally leads to a significant increase in noise levels, as well as increased cost and size.

[0162] In summary, this utility model aims to provide an optimized structure for the handwheel and fan blades, achieving precise and effective improvement and optimization;

[0163] Based on the scenario of synchronous rotation of the handwheel and fan blades, this application uses CFD simulation to perform integrated simulation analysis of the handwheel and fan blades, identifying the root cause of the performance deficiencies of traditional designs. Targeted optimization indicators are proposed for the topology of the handwheel and fan blades, which are then applied to the integrated structure. The optimal opening shape for the handwheel opening, with an oval opening and tilt angle, effectively reduces the resistance of the wheel opening. Basic structural characteristics for high-performance fan blades are proposed, increasing the chord length at the blade tip significantly improves the work capacity of the fan blades. The design of the semi-outer ring at the blade tip increases leading-edge stability and utilizes the centrifugal force of the trailing edge, providing optimization potential for high aerodynamic performance. The effectiveness of the optimized handwheel and fan blade improvements is verified through a combination of CAE strength simulation and CFD simulation.

[0164] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A hand wheel and vane integrated device comprising a hand wheel (100) and a vane wheel (300), characterized in that, The handwheel (100) and the fan impeller (300) are nested together and coaxially arranged; The handwheel (100) includes a bushing (200), a wheel disc (102), a raised cylinder (101), and a wheel cylinder (104); the bushing (200) and the wheel cylinder (104) are concentrically arranged, and the wheel disc (102) is arranged between the bushing (200) and the wheel cylinder (104); The wheel (102) is provided with a fan-shaped elongated oval hole, and the two ends of the hole wall at different radial positions maintain a specified forward tilt angle, and the hole angle gradually increases radially outward; The handwheel (100) and the fan impeller (300) are connected by threaded parts; The impeller (300) includes an outer cylinder (301), an inner cylinder (303), and fan blades. The outer cylinder (301) and the inner cylinder (303) are arranged concentrically, and 5-7 fan blades are arranged in a ring between the inner cylinder (303) and the outer cylinder (301). The inner cylinder (303) is fitted with a bushing (200), and the outer cylinder (301) is fitted with a wheel cylinder (104); From the base to the tip of the fan blade, the chord length increases.

2. The hand wheel and fan blade integrated device of claim 1, wherein, The blade thickness of the impeller (300) ranges from 0.1 to 3 mm.

3. The hand wheel and fan blade integrated device of claim 2, wherein, The blade thickness of the impeller (300) is 1.5mm.

4. The hand wheel and fan blade integrated device of claim 1, wherein, The impeller (300) has 6 blades.

5. The hand wheel and fan blade integrated device of claim 1, wherein, Radial ribs are provided between the bushing (200) and the wheel cylinder (104), and they are arranged in an arc shape.

6. A hand wheel and flap integration device as claimed in claim 5, characterized in that The windward side of the radial ribs is tilted backward to maintain the maximum draft angle.

7. The hand wheel and flap integrated device of claim 1, wherein, The handwheel (100) has an annular array of raised cylinders (101) along its axial direction. The inner cavity of the raised cylinders (101) is provided with internal threads for installing threaded parts to connect the handwheel (100) and the fan impeller (300). A positioning cylinder (305) is provided at the root of some fan blades to match the protruding cylinder (101). The positioning cylinder (305) is used to insert into the protruding cylinder (101) and abut against and limit the protruding cylinder (101).

8. The hand wheel and flap integrated device of claim 1, wherein, The handwheel (100) is embedded inside the outer cylinder (301) of the fan impeller (300) via the wheel cylinder (104); the wheel cylinder (104) is provided with positioning hole I, and the outer cylinder (301) is provided with positioning hole II; Positioning holes I and II are matched to align and connect the handwheel (100) and the fan impeller (300) into a single unit. Positioning holes I or II are provided with internal threads.

9. The hand wheel and flap integrated device of claim 1, wherein, From the leaf tip (308) to the outer edge (309), the thickness of the fan blade increases.

10. The hand wheel and flap integration device of claim 1, wherein, A rectangular groove (302) is provided at the outer end of the outer cylinder (301) facing the handwheel (100); a positioning block (103) is provided on the bushing (200), and a positioning groove (304) is provided on the inner cylinder (303). The positioning block (103) is embedded in the positioning groove (304) for limiting the position.

Images