Connecting structure of steel shaft disc and middle wind wheel

Abstract

The utility model relates to the technical field of air conditioner fan blade manufacturing, in particular to a connecting structure of a steel shaft disc and a middle wind wheel. According to the technical scheme, the connecting structure of the steel shaft disc and the medium wind wheel comprises the steel shaft disc, the steel shaft disc is composed of a disc body and a steel shaft fixed to the center of the disc body, and a plurality of connecting pieces are evenly distributed on the edge of the inner disc face of the disc body in the circumferential direction; the middle wind wheel is composed of a wheel ring and a plurality of blades arranged on the wheel ring, and a plurality of welding grooves corresponding to the connecting pieces are formed in the outer end face of the wheel ring in the circumferential direction; the connecting pieces are embedded into the welding grooves, and the disc face of the steel shaft disc body is attached to the wheel face of the middle wind wheel ring. The scheme has the advantages of improving the connection strength, simplifying the assembly process, improving the structural stability and reducing the maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of air conditioner fan blade manufacturing technology, and in particular to a connection structure between a steel shaft disc and a central impeller. Background Technology

[0002] Crossflow fan blades are important components commonly used in air conditioning systems. Their structure typically includes a motor shaft disc, a steel shaft disc, and several intermediate discs positioned between them. In existing crossflow fan designs, the steel shaft disc usually has blade mating slots on its surface for connecting to the blade ends of adjacent intermediate impellers. Specific examples of this connection method can be found in the document with publication number "CN206356803U".

[0003] However, this traditional connection structure has some obvious drawbacks. First, the blades on the wind turbine rotor are typically quite long, and when their ends need to be inserted into the blade mating slots of the steel shaft disc, it is difficult to ensure that each blade is precisely aligned with the slot. This places extremely high demands on the positioning accuracy during assembly, increasing production difficulty and cost. Second, even if the blade ends are successfully inserted into the mating slots, the connection strength between the steel shaft disc and the adjacent wind turbine rotor is still not ideal after ultrasonic welding. This may lead to the risk of loosening or detachment during long-term use, affecting the overall performance and service life of the wind turbine blades.

[0004] To address the aforementioned issues, existing technologies urgently need improvement. Summary of the Invention

[0005] To address the aforementioned problems, the present invention aims to provide a connection structure between a steel shaft disc and a wind turbine, which offers advantages such as improved connection strength, simplified assembly process, enhanced structural stability, and reduced maintenance costs.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A connection structure between a steel shaft disc and a wind turbine, the technical solution of which is as follows: It includes a steel shaft disc, consisting of a disc body and a steel shaft fixed at the center of the disc body, wherein multiple connecting pieces are evenly distributed circumferentially along the inner edge of the disc body; a wind turbine, consisting of a ring and multiple blades disposed on the ring, wherein multiple welding grooves corresponding to the connecting pieces are formed circumferentially on the outer end face of the ring; the connecting pieces are embedded in the welding grooves, and the disc surface of the steel shaft disc body is in contact with the wheel surface of the wind turbine ring.

[0008] Furthermore, this application also proposes that the end of the connecting piece is provided with a welding step, the welding step abutting against the bottom surface of the welding groove, and the width of the welding step is adjustable to control the welding amount.

[0009] Further, the application also provides that the two ends of the welding step are provided with step openings, and the two side edges of the connecting piece are also provided with step openings.

[0010] Further, the application also provides that the inner side end face of the disc body is provided with a shaft sleeve part at the center, the shaft end of the steel shaft is inserted into the disc body from the outer side end face and fixed in the shaft sleeve part, the inner side end face of the disc body is provided with a boss and a plurality of reinforcing ribs which are integrated with the inner side end face, the boss is centered on the shaft sleeve part, the plurality of reinforcing ribs are arranged in a circle around the shaft sleeve part, the reinforcing ribs are arranged on the boss in the radial direction of the disc body, and the inner side end part of the reinforcing ribs is integrated with the shaft sleeve part, and when the steel shaft disc is attached to the wind wheel, the shaft sleeve part and the reinforcing ribs are embedded in the central hole of the wheel ring of the wind wheel.

[0011] Further, the application also provides that the boss is a conical boss, the bottom of the boss is integrated with the inner side end face of the disc body, and the top of the boss is integrated with the shaft sleeve part.

[0012] Further, the application also provides that the plurality of reinforcing ribs are arranged in a circle around the shaft sleeve part, and the central angle of the arc formed between any two adjacent reinforcing ribs is equal.

[0013] Further, the application also provides that the outer end part of the plurality of reinforcing ribs is on the same circle line, and the diameter of the circle line is equal to the diameter of the bottom surface of the boss, and the bottom surface of the outer end part of the reinforcing ribs is connected to the inner side end face of the disc body at the edge of the boss.

[0014] Further, the application also provides that a reinforcing ring is arranged on the boss and centered on the shaft center of the shaft sleeve part, and the reinforcing ring passes through the plurality of reinforcing ribs.

[0015] Further, the application also provides that the width tolerance of the welding groove is ±0.02mm, and the depth tolerance is ±0.01mm, and the thickness of the connecting piece is 1.2-1.8mm.

[0016] Further, the application also provides that the fitting gap between the connecting piece and the welding groove is 0.02-0.05mm, and the root of the connecting piece is provided with a chamfer.

[0017] As can be seen from the above, the connecting structure of the steel shaft disc and the wind wheel provided by the application comprises a steel shaft disc and a wind wheel, the disc body of the steel shaft disc is provided with a connecting piece at the edge of the disc face, the outer end face of the wheel ring of the wind wheel is provided with a welding groove corresponding to the connecting piece, the connecting piece is embedded in the welding groove, and the disc body of the steel shaft disc is attached to the wheel ring of the wind wheel. This design realizes the stable connection of the steel shaft disc and the wind wheel through the precise fitting of the connecting piece and the welding groove, improves the connection strength, simplifies the assembly process, improves the structural stability, and reduces the maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1A schematic view of a steel axle disc provided for the present application.

[0019] Figure 2 A cross-sectional view of a connection state of a steel axle disc and a flywheel provided for the present application.

[0020] Figure 3 A perspective view of a connection state of a steel axle disc and a flywheel provided for the present application.

[0021] Figure 4 A Figure 3 An enlarged view of A part of the steel axle disc. DETAILED DESCRIPTION

[0022] The embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below are examples for explaining the present application and should not be construed as limiting the present application.

[0023] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be construed as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application.

[0024] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more, unless otherwise explicitly limited.

[0025] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] In the utility model, unless another definite provision and limitation, first feature is "on" or "under" second feature can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but contact through other feature between them. Moreover, first feature "on", "above" and "upper surface of" second feature includes that first feature is directly above and obliquely above second feature, or only indicates that first feature is higher than second feature in horizontal height. First feature "under", "below" and "under surface of" second feature includes that first feature is directly below and obliquely below second feature, or only indicates that first feature is less than second feature in horizontal height.

[0027] As Figures 1-4 The utility model discloses a steel axle disc and the connecting structure of wind wheel, including steel axle disc and wind wheel. Steel axle disc is by disc body 1 and the steel axle 2 of fixed at disc body 1 center, and the inner disc surface edge of disc body 1 is evenly distributed with a plurality of connecting piece 3 along the circumference. Wind wheel is by wheel ring 4 and a plurality of blades 5 set up on wheel ring 4, and the outer end surface of wheel ring 4 is set up with a plurality of welding groove 6 corresponding with connecting piece 3 along the circumference. Connecting piece 3 is embedded in welding groove 6, and the disc surface of disc body 1 of steel axle disc is pasted with the wheel surface of wheel ring 4. The technical scheme realizes axial positioning through steel axle 2, realizes radial positioning using the cooperation of connecting piece 3 and welding groove 6, and ensures the concentricity when assembling. The pasting of disc surface and wheel surface increases the contact area, and the embedded cooperation of connecting piece 3 and welding groove 6 provides greater welding contact surface. Compared with the connecting mode of blade 5 butt joint groove in prior art, the double positioning mode of mechanical embedding and surface contact is used in the scheme, which significantly improves the assembly accuracy and connection strength. Specifically, the accurate cooperation of connecting piece 3 and welding groove 6 avoids the problem that the end of blade 5 is difficult to align in the traditional scheme, and the increased welding contact area effectively improves the carrying capacity of the connecting structure.

[0028] In as Figure 3 And 4In the shown scheme, the end of the connecting sheet 3 is provided with a welding step 7, which is in abutting contact with the bottom surface of the welding groove 6. The width of the welding step 7 can be adjusted to control the amount of welding. The specific implementation of the welding step 7 includes but is not limited to: the step width is controlled within the range of 0.5-2.0mm by machining, and the step height is 0.1-0.3mm different from the depth of the welding groove 6; the step can adopt a straight transition or a circular arc transition structure; the step surface can be provided with anti-skid lines to enhance the stability of contact. The welding step 7 and the connecting sheet 3 can be manufactured by integral molding process, and the material is selected to be the same as the connecting sheet 3. The technical scheme forms mechanical limiting by the rigid contact of the welding step 7 and the bottom surface of the welding groove 6, ensures the consistency of the welding position, and avoids the displacement of the connecting sheet 3 during the welding process. The directly controllable step width determines the filling space of the welding material, and by presetting the step size of different widths, the precise control of the welding amount can be realized. Compared with the prior art, the design not only solves the problem of insufficient welding positioning accuracy, but also quantitatively controls the filling amount of the welding material, so that the fluctuation range of the connection strength is reduced from the original ±15% to within ±5%, and the occurrence rate of welding defects is also reduced. The step structure also plays a role in heat dissipation during welding, which can effectively inhibit the expansion of the welding heat affected zone. In the specific scheme, the two ends of the welding step 7 and the two side edges of the connecting sheet 3 are provided with step openings 8. The specific implementation of the step opening 8 includes but is not limited to: rectangular notches, arc grooves or trapezoidal opening structures, wherein the length of the right angle side of the rectangular notch is 0.5-1.2mm; the curvature radius of the arc groove is controlled within the range of 0.3-0.8mm; the inclination angle of the trapezoidal opening is set to 30°-60°. The depth of the step opening 8 is preferably 1 / 3-1 / 2 of the thickness of the welding step 7, and the spacing between adjacent step openings 8 is kept 1.5-3 times the width of the notch. As a preferred embodiment, the step opening 8 adopts a symmetrical distribution form, and 2-4 equally spaced step openings 8 are arranged on each side edge of the connecting sheet 3. The technical scheme realizes stress dispersion through intermittent contact design, and the non-continuous contact surface formed by the step opening 8 makes the welding stress uniformly distributed in multiple discrete areas. The molten material can be filled into the gap between the contact surfaces through the flow channel formed by the step opening 8, and the thermal stress generated during the welding process is effectively blocked and conducted by the step opening 8 structure. Compared with the existing continuous contact welding method, the design reduces the local stress concentration by 40%-60% while maintaining more than 85% of the effective contact area. Experimental data show that the tensile strength fluctuation range of the welding joint using this structure is reduced to within ±5% from the traditional scheme of ±15%, and the welding qualification rate is improved to 98.3%. The step opening 8 structure optimizes the material flow path, reduces the porosity of the welding area to below 0.5%, and significantly improves the consistency of the weld formation.

[0029] As Figure 1 and 2As shown, the inner end face of the disc body 1 is provided with a shaft sleeve part 9 at the center, the shaft end of the steel shaft 2 penetrates the outer end face of the disc body 1 and is fixed in the shaft sleeve part 9; the inner end face of the disc body 1 is provided with a boss 10 and a plurality of reinforcing ribs 11 integrated therewith, the boss 10 is centered on the shaft sleeve part 9; the plurality of reinforcing ribs 11 are arranged in a circle around the shaft sleeve part 9, the reinforcing ribs 11 are arranged on the boss 10 in the radial direction of the disc body 1, and the inner end of the reinforcing ribs 11 is integrally connected to the shaft sleeve part 9; when the steel shaft disc is attached to the wind wheel, the shaft sleeve part 9 and the reinforcing ribs 11 are embedded in the central hole 12 of the wind wheel ring 4. The shaft sleeve part 9 can be fixed with the steel shaft 2 by interference fit or one-piece injection molding, and the wall thickness is preferably 3-5mm to ensure the bearing strength. The number of reinforcing ribs 11 is preferably 6-12, and the cross section is trapezoidal or rectangular, and the rib height is 1.5-3mm. The scheme realizes the rigid connection of the steel shaft 2 and the disc body 1 through the shaft sleeve part 9, the boss 10 provides axial support and stress dispersion, and the circumferential reinforcing rib 11 forms a three-dimensional support network. When installing, the shaft sleeve part 9 and the reinforcing rib 11 are embedded in the central hole 12 at the same time, avoiding the interference of the shaft sleeve part 9 and the reinforcing rib 11 with the attachment of the steel shaft disc and the wind wheel. Among them, the shaft sleeve part 9 as the core bearing part bears the main torque, the boss 10 reduces the local stress by increasing the contact area, and the reinforcing rib 11 system synchronously improves the bending and torsional properties through radial and circumferential arrangement. Compared with the prior art, the structure realizes more than 30% improvement in connection strength in the same space, the assembly concentricity error is controlled within 0.05mm, and no additional positioning tool is needed.

[0030] Further, the boss 10 is a conical boss, the bottom is integrally connected to the inner end face of the disc body 1, and the top is integrally connected to the shaft sleeve part 9. Specifically, the selection of the taper angle needs to consider the stress dispersion effect and material utilization. As a preferred embodiment, the side wall of the conical boss can be designed as a smooth transition curved surface, for example, a circular arc transition is adopted, to further reduce stress concentration. The ratio of the height of the conical boss to the thickness of the disc body 1 is recommended to be controlled between 0.5 and 1.2, thereby ensuring that the stiffness of the transition area matches. In addition, a fillet structure can be added at the connection between the top of the conical boss and the shaft sleeve part 9, and the fillet radius is preferably 1 to 3mm to avoid local stress caused by sharp corners. The technical scheme changes the force transmission path between the disc body 1 and the shaft sleeve part 9 from abrupt to continuous through the gradual transition structure of the conical boss. Specifically, the conical geometry increases the connection cross-sectional area, so that the torque load can be evenly distributed to the disc body 1 along the side wall. Compared with the boss 10 of the prior art with a right-angle connection, the conical design can reduce the stress peak by more than 30%, and at the same time, the fatigue resistance is improved by optimizing the material distribution.

[0031] In the figure, a plurality of reinforcing ribs 11 are arranged in a regular circle around the shaft sleeve 9, and the central angles of the arcs formed between adjacent reinforcing ribs 11 are equal. Specifically, the equal central angles refer to the fact that the angles formed by the center lines of adjacent reinforcing ribs 11 at the center of the shaft sleeve 9 are completely consistent. As a preferred embodiment, the central angles can be set to 30°, 45°, or 60°, etc. Thus, the technical solution realizes the optimization of mechanical properties through geometric symmetry. When the disc body 1 bears radial load, the stress is uniformly transmitted to the shaft sleeve 9 through the reinforcing ribs 11 arranged at equal angles, effectively avoiding the local stress concentration phenomenon caused by the traditional random arrangement. Further, the outer ends of the plurality of reinforcing ribs 11 are located on the same circle line, and the diameter of the circle line is equal to the diameter of the bottom surface of the boss 10; the bottom surface of the outer end of the reinforcing rib 11 is connected to the inner end surface of the disc body 1 at the edge of the boss 10. The technical solution realizes the uniform transmission of radial load from the outer end of the reinforcing rib 11 to the edge of the boss 10 through the geometric matching force transmission path design, and the limitation of the diameter of the circle line ensures that the reinforcing rib 11 and the boss 10 form a concentric force conduction ring, avoiding the imbalance of the moment caused by the diameter deviation.

[0032] In the figure, a plurality of reinforcing ribs 11 are arranged in a regular circle around the shaft sleeve 9, and the central angles of the arcs formed between adjacent reinforcing ribs 11 are equal. Specifically, the equal central angles refer to the fact that the angles formed by the center lines of adjacent reinforcing ribs 11 at the center of the shaft sleeve 9 are completely consistent. As a preferred embodiment, the central angles can be set to 30°, 45°, or 60°, etc. Thus, the technical solution realizes the optimization of mechanical properties through geometric symmetry. When the disc body 1 bears radial load, the stress is uniformly transmitted to the shaft sleeve 9 through the reinforcing ribs 11 arranged at equal angles, effectively avoiding the local stress concentration phenomenon caused by the traditional random arrangement. Further, the outer ends of the plurality of reinforcing ribs 11 are located on the same circle line, and the diameter of the circle line is equal to the diameter of the bottom surface of the boss 10; the bottom surface of the outer end of the reinforcing rib 11 is connected to the inner end surface of the disc body 1 at the edge of the boss 10. The technical solution realizes the uniform transmission of radial load from the outer end of the reinforcing rib 11 to the edge of the boss 10 through the geometric matching force transmission path design, and the limitation of the diameter of the circle line ensures that the reinforcing rib 11 and the boss 10 form a concentric force conduction ring, avoiding the imbalance of the moment caused by the diameter deviation.

[0033] In addition, the width tolerance of the welding groove 6 is ±0.02mm, the depth tolerance is ±0.01mm, the thickness of the connecting piece 3 is 1.2-1.8mm. The matching gap of the connecting piece 3 and the welding groove 6 is 0.02-0.05mm, and the root of the connecting piece 3 is provided with a chamfer 14. By strictly controlling the width and depth tolerances of the welding groove 6, the machining precision of the groove body is ensured to meet the assembly requirements; the thickness range of the connecting piece 3 is limited and matched with the welding groove 6 in size, so that the matching gap is stabilized in the range of 0.02-0.05mm, which not only ensures the smoothness of assembly but also avoids the influence of excessive gap on the welding strength; the chamfer 14 structure at the root of the connecting piece 3 is beneficial to assembly guidance and stress dispersion. These technical features work together to solve the problem of unstable welding quality caused by insufficient matching precision of the connecting piece 3 and the welding groove 6. Further, the matching gap of the connecting piece 3 and the welding groove 6 is controlled in the range of 0.02-0.05mm, and the root of the connecting piece 3 is provided with a chamfer 14. The technical scheme solves the assembly precision and convenience problem through the synergistic effect of the matching gap and the chamfer 14 structure. The gap design of 0.02-0.05mm not only reserves the assembly tolerance allowance, but also ensures the welding positioning precision; the chamfer 14 structure effectively reduces the assembly resistance and avoids root interference. Compared with the way of directly inserting the blade 5 into the butt groove in the prior art, this scheme significantly improves the assembly efficiency and ensures the welding reliability through the precise matching of the connecting piece 3 and the welding groove 6, and is especially suitable for the high-precision connection requirement of the steel shaft disc and the central wind wheel in the cross-flow fan blade.

[0034] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0035] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those skilled in the art can make changes, modifications, replacements and variations to the above embodiments without departing from the principles and purposes of the present application within the scope of the present application.

Claims

1. A connecting structure of a steel shaft disc and a wind wheel, characterized by, include: - The steel shaft disc consists of a disc body (1) and a steel shaft (2) fixed at the center of the disc body (1). Multiple connecting pieces (3) are evenly distributed along the circumferential direction on the inner edge of the disc body (1). - The wind turbine is composed of a ring (4) and multiple blades (5) disposed on the ring (4). The outer end face of the ring (4) is provided with multiple welding grooves (6) corresponding to the connecting piece (3) along the circumferential direction. The connecting piece (3) is embedded in the welding groove (6), and the disc surface of the steel shaft disc body (1) is in contact with the wheel surface of the wind turbine wheel ring (4).

2. The connecting structure of a steel axle disc and a pulley according to claim 1, characterized by The end of the connecting piece (3) is provided with a welding step (7), which abuts against the bottom surface of the welding groove (6). The width of the welding step (7) can be adjusted to control the welding amount.

3. The connecting structure of a steel axle disc and a wind wheel according to claim 2, characterized in that, The welding step (7) has step openings (8) at both ends and on both sides of the connecting piece (3).

4. The connecting structure of a steel axle disc and a pulley according to claim 1, characterized by A bushing (9) is provided at the center of the inner end face of the disc (1). The shaft end of the steel shaft (2) is inserted into the bushing (9) from the outer end face of the disc (1) and fixed inside the bushing (9). A boss (10) and multiple reinforcing ribs (11) are provided on the inner end face of the disc (1) and are integrated therewith. The boss (10) is centered on the bushing (9). The multiple reinforcing ribs (11) are arranged circumferentially around the bushing (9) and are arranged radially on the boss (10) along the disc (1). The inner end of the reinforcing rib (11) is integrally connected to the bushing (9). When the steel shaft disc is in contact with the wind turbine, the bushing (9) and the reinforcing rib (11) are embedded in the central hole (12) of the wind turbine ring (4).

5. The connecting structure of a steel axle disc and a hub wheel according to claim 4, characterized by The boss (10) is a cone-shaped platform, with its bottom integrally connected to the inner end face of the disc body (1) and its top integrally connected to the bushing (9).

6. The connecting structure of a steel axle disc and a hub wheel according to claim 4, wherein The multiple reinforcing ribs (11) are arranged in a regular circumferential pattern with the bushing portion (9) as the center, and the arc angle formed between two adjacent reinforcing ribs (11) is equal.

7. The connecting structure of a steel axle disc and a pulley according to claim 6, wherein The outer ends of the multiple reinforcing ribs (11) are on the same circumference, and the diameter of the circumference is equal to the bottom diameter of the boss (10); the bottom surface of the outer end of the reinforcing rib (11) is connected to the inner end face of the disc (1) at the edge of the boss (10).

8. The connecting structure of a steel axle disc and a hub wheel according to claim 4, wherein A reinforcing ring (13) with the shaft sleeve (9) as the center is constructed on the boss (10), and the reinforcing ring (13) passes through multiple reinforcing ribs (11).

9. The connecting structure of a steel axle disc and a pulley according to claim 1, wherein The width tolerance of the welding groove (6) is ±0.02mm and the depth tolerance is ±0.01mm; the thickness of the connecting piece (3) is 1.2-1.8mm.

10. The connecting structure of a steel axle disc and a pulley according to claim 1, wherein The fitting gap between the connecting piece (3) and the welding groove (6) is 0.02-0.05mm, and the root of the connecting piece (3) is provided with a chamfer (14).

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