A high-balance cross-flow fan blade

Abstract

This invention relates to the field of cross-flow fan technology, and more particularly to a highly balanced cross-flow fan blade. The cross-flow fan blade includes a mounting bracket, an integrated impeller, a drive motor, a rotating shaft, a key, and straightening blocks. The integrated impeller is integrally formed from symmetrical end plates, annular array of arc-shaped blades, and multiple sets of reinforcing rings, effectively solving the problem of easy deformation and breakage in traditional split-type fan blades. Straightening blocks are axially spaced on the rotating shaft, with the outer edge of each block abutting against the inner edge of the arc-shaped blades. This radially straightens and limits the high-speed rotation of the impeller, preventing eccentric vibration. Simultaneously, the straightening blocks are equipped with guide holes for weight reduction, balancing weight reduction with airflow efficiency. The rotating shaft achieves synchronous transmission through key engagement with the impeller keyway. Combined with the integrally formed mounting bracket, this ensures overall installation accuracy and transmission coaxiality. This invention features a reasonable structural design, effectively improving the operational balance and structural strength of the cross-flow fan blade, and reducing equipment vibration and noise during operation.

Description

Technical Field

[0001] This invention relates to the field of cross-flow fan blade technology, and more particularly to a highly balanced cross-flow fan blade. Background Technology

[0002] Cross-flow fan blades, as core air supply components in ventilation and heat exchange equipment such as air conditioners and fresh air systems, are widely used in indoor units of residential and commercial air conditioners and embedded fresh air systems due to their advantages of uniform air delivery, low noise, and compact size. The operational balance of the cross-flow fan blades directly determines the vibration amplitude, noise level, and service life of the equipment. Poor balance can cause eccentric vibration when the fan blades operate at high speeds, leading to abnormal noises and vibrations throughout the unit. Long-term operation can also cause bearing wear, fan blade deformation and breakage, significantly reducing the user experience and service life of the equipment. Therefore, high balance is one of the key design criteria for cross-flow fan blades.

[0003] Existing cross-flow fan blades have shortcomings in use. First, they use split blades, which are prone to deformation and breakage. Second, they lack a straightening component, resulting in less than ideal overall balance. In view of this, the inventors aim to provide a cross-flow fan blade with high balance. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned problems existing in the conventional technology and to provide a highly balanced cross-flow fan blade.

[0005] To achieve the above-mentioned technical objectives and effects, the present invention is implemented through the following technical solution:

[0006] A highly balanced cross-flow fan blade includes a mounting bracket, an integrated impeller, a drive motor, a shaft, a key, and a centering block. The integrated impeller is movably mounted on the mounting bracket. The integrated impeller includes two symmetrically arranged end plates, several arc-shaped blades, and several reinforcing rings. A ring of arc-shaped blades is arranged in a circular array between the two end plates. Several reinforcing rings are fixedly inserted through each of the arc-shaped blades. A shaft hole is formed at the center of each end plate, and keyways are symmetrically formed on the inner wall of the shaft hole. The drive motor is fixedly mounted on the mounting bracket at a position corresponding to the periphery of the integrated impeller. The output of the drive motor... The rotating shaft is fixedly connected to the end, and a convex key matching the keyway is fixedly engaged on the outer side of the rotating shaft. Several straightening blocks are sleeved on the shaft body that extends into the integrated impeller. The straightening blocks are circular in structure, with the outer edge of the straightening block abutting against the inner edge of the arc-shaped blade. The center of the straightening block has a mounting hole for adapting to the rotating shaft, and several flow guiding and weight reduction holes are opened around the mounting hole of the straightening block. The mounting bracket includes a base plate, and support plates are symmetrically arranged on the left and right sides of the base plate. The support plates have through holes that cooperate with the rotating shaft, and the upper two ends of the base plate have pre-installed holes for installing arc-shaped baffles.

[0007] Furthermore, in the above-mentioned high-balance cross-flow fan blade, the two end plates have completely identical dimensions and are arranged in parallel and symmetrical arrangement. The two ends of the arc-shaped blades are fixedly connected to the inner sidewalls of the two end plates respectively. All the arc-shaped blades are arranged in a uniform ring array around the center of the end plates, forming an annular air supply structure of an integrated impeller.

[0008] Furthermore, in the aforementioned high-balance cross-flow fan blade, several reinforcing rings are distributed at equal intervals along the axial direction of the arc-shaped blade, and the reinforcing rings are annular structures.

[0009] Furthermore, in the aforementioned high-balance cross-flow fan blade, the rotating shaft passes through the mounting bracket via a perforation in the support plate, and the rotating shaft and the perforation in the support plate are fitted with a clearance fit. The drive motor is fixed to the outside of the mounting bracket, and the output shaft of the drive motor is coaxially fixed with the rotating shaft to ensure smooth rotation and transmission of the rotating shaft.

[0010] Furthermore, in the aforementioned high-balance cross-flow fan blade, the convex key and the rotating shaft are integrally formed or detachably fixedly connected. The convex key and the keyway of the end plate are precisely engaged and matched to achieve circumferential fixation of the rotating shaft and the integral impeller, ensuring that the rotating shaft can synchronously drive the integral impeller to rotate.

[0011] Furthermore, in the aforementioned high-balance cross-flow fan blade, several of the aforementioned straightening blocks are arranged at intervals along the axial direction of the rotating shaft. The mounting holes of the straightening blocks are fixed with the rotating shaft by interference fit, and the outer edge contour of the straightening blocks is adapted to the inner ring contour formed by the arc-shaped blades, always maintaining contact and fit with the inner edge of the arc-shaped blades.

[0012] Furthermore, in the aforementioned high-balance cross-flow fan blade, a number of flow-guiding and weight-reducing holes on the straightening block are arranged in a ring array around the mounting hole. The flow-guiding and weight-reducing holes are circular through holes, and the diameter and spacing of each flow-guiding and weight-reducing hole are consistent. This reduces the weight of the straightening block while ensuring smooth airflow during the rotation of the integrated impeller.

[0013] Furthermore, in the aforementioned high-balance cross-flow fan blade, the base plate and the two side support plates are integrally formed, and the pre-installed holes are strip-shaped mounting holes, symmetrically distributed at both ends of the upper side of the base plate, which facilitates the quick disassembly and assembly of the arc-shaped baffle and can be adapted to the installation and use of arc-shaped baffles of different specifications.

[0014] The beneficial effects of this invention are:

[0015] 1. This invention adopts an integrated impeller structure, abandoning the traditional splicing and assembly method of split-type fan blades. The end plate, arc-shaped blades, and reinforcing rings are integrally fixed and formed, and with multiple sets of equally spaced annular reinforcing rings, the overall structural rigidity and integrity of the impeller are significantly improved. This effectively solves the problems of blade loosening, deformation, breakage, and structural misalignment that easily occur in traditional split-type fan blades during long-term high-speed operation, greatly improving the structural stability and deformation resistance of the fan blades and extending their service life.

[0016] 2. This invention features an axially distributed straightening block structure. The straightening blocks are spaced apart along the rotation axis, with their outer edges always in close contact with the inner edge of the arc-shaped blades. This provides omnidirectional radial straightening and limiting of the high-speed rotating integrated impeller, effectively counteracting the eccentric deviation generated during impeller operation and eliminating eccentric vibration. It thoroughly improves upon the shortcomings of traditional fan blades, which lack a straightening structure and have poor balance, significantly reducing the vibration amplitude of the fan blades. This fundamentally reduces body vibration and abnormal noise problems during the operation of air conditioning and fresh air systems, significantly improving equipment quietness and user experience.

[0017] 3. The straightening block of this invention features a circular array of guide and weight-reducing holes. While achieving precise straightening and ensuring operational balance, this effectively reduces the self-weight of the straightening block, thereby reducing the load on the shaft and drive motor and lowering equipment energy consumption. Simultaneously, the circular guide and weight-reducing holes ensure smooth airflow within the impeller, maintaining the core advantage of uniform air delivery from the cross-flow fan blades. This balances performance and air delivery efficiency, ensuring uniform airflow and stable air volume.

[0018] Of course, any product implementing this invention does not necessarily need to achieve all of the above advantages at the same time. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the integrated impeller in this invention;

[0022] Figure 3 This is a half-sectional schematic diagram of the integrated impeller in this invention;

[0023] Figure 4 This is a schematic diagram of the mounting bracket in this invention;

[0024] Figure 5 This is a schematic diagram of the structure of the rotating shaft and its components in this invention;

[0025] Figure 6 This is a schematic diagram showing the position of the straightening block in this invention;

[0026] In the attached diagram, the components represented by each number are as follows:

[0027] 1-Mounting bracket, 101-Base plate, 102-Support plate, 103-Through hole, 104-Pre-installation hole, 2-Integral impeller, 201-End plate, 202-Arc blade, 203-Reinforcing ring, 204-Shaft hole, 205-Keyway, 3-Drive motor, 4-Rotating shaft, 5-Protruding key, 6-Straightening block, 601-Mounting hole, 602-Flow guide and weight reduction hole. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] like Figures 1-6 As shown, this embodiment provides a highly balanced cross-flow fan blade, including a mounting bracket 1, an integrated impeller 2, a drive motor 3, a rotating shaft 4, a key 5, and a straightening block 6. The mounting bracket 1 adopts an integrated molding structure, consisting of a rectangular base plate 101 and symmetrical support plates 102. A circular through hole 103 is opened in the center of the support plate 102, and strip-shaped pre-installed holes 104 are symmetrically opened at both ends of the upper side of the base plate 101 for mounting arc-shaped baffles.

[0030] In this embodiment, the integrated impeller 2 is movably supported and installed between two sets of support plates 102 of the mounting bracket 1. It includes two identical, parallel, and symmetrical circular end plates 201. 36 sets of arc-shaped blades 202 are evenly arranged in a ring array between the two end plates 201. The two ends of each arc-shaped blade 202 are integrally fixed to the inner sidewalls of the two end plates 201. Three sets of annular reinforcing rings 203 are axially and equally spaced on the arc-shaped blades 202. These three sets of reinforcing rings 203 are respectively located at both ends and the middle of the blade's axial direction to enhance the overall structural strength. A shaft hole 204 is formed at the center of the end plate 201, and two sets of keyways 205 are symmetrically formed on the inner wall of the shaft hole 204.

[0031] In this embodiment, the drive motor 3 is fixed to the outside of the support plate 102 by bolts. The output end of the drive motor 3 is coaxially and tightly connected to the rotating shaft 4. The rotating shaft 4 passes through the through hole 103 of the support plate 102 and is clearance-fitted with the through hole 103. The outer side of the rotating shaft 4 is integrally formed with a convex key 5 that precisely matches the keyway 205. The convex key 5 engages with the keyway 205 to achieve circumferential fixation between the rotating shaft 4 and the integrated impeller 2, ensuring synchronous rotation.

[0032] In this embodiment, two sets of circular straightening blocks 6 are fixedly fitted onto the shaft of the integrated impeller 2, with the shaft 4 extending into it. Each straightening block 6 has a center with an interference fit mounting hole 601 that fits the shaft 4. Around the mounting hole 601, eight circular guide and weight-reducing holes 602 of the same diameter are arranged in a ring array. The outer contour of the straightening block 6 perfectly matches the inner contour formed by the arc-shaped blades 202. After assembly, the outer edge of the straightening block 6 tightly abuts against the inner edges of all the arc-shaped blades 202, allowing for radial straightening and limiting of the impeller's rotation.

[0033] After assembly, this embodiment is applied to the indoor unit of a household air conditioner. The drive motor 3 drives the rotating shaft 4 and the integrated impeller 2 to rotate at high speed. The integrated structure has no splicing gaps and is not easily deformed. With the limiting and straightening effect of the double set of straightening blocks 6, the eccentricity of the impeller can be controlled within 0.02mm. The whole machine operates without obvious vibration or abnormal noise, and the air supply uniformity is improved by more than 15%. After 10,000 hours of continuous operation, there are no faults such as blade deformation or bearing wear. The stability and service life of the equipment are greatly improved.

[0034] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A highly balanced cross-flow fan blade, characterized in that: The system includes a mounting bracket, an integrated impeller, a drive motor, a rotating shaft, a key, and a straightening block. The integrated impeller is movably mounted on the mounting bracket. The integrated impeller includes two symmetrically arranged end plates, several arc-shaped blades, and several reinforcing rings. A ring of arc-shaped blades is arranged in a circular array between the two end plates. Several reinforcing rings are fixedly inserted through the arc-shaped blades. A shaft hole is formed in the center of each end plate, and keyways are symmetrically formed on the inner wall of the shaft hole. The drive motor is fixedly mounted on the mounting bracket at a position corresponding to the periphery of the integrated impeller. The output end of the drive motor is fixedly connected to the rotating shaft. The shaft has a convex key that matches the keyway fixedly engaged on its outer side. Several straightening blocks are sleeved on the shaft body that extends into the integrated impeller. The straightening blocks are circular in structure, with their outer edges abutting against the inner edges of the arc-shaped blades. The center of the straightening block has a mounting hole for adapting to the shaft, and several flow-guiding and weight-reducing holes are provided around the mounting hole. The mounting bracket includes a base plate, with support plates symmetrically arranged on the left and right sides of the base plate. The support plates have through holes that mate with the shaft, and the upper two ends of the base plate have pre-installed holes for installing arc-shaped baffles.

2. The high-balance cross-flow fan blade according to claim 1, characterized in that: The two end plates are identical in size and are arranged in parallel and symmetrical arrangement. The two ends of the arc-shaped blades are fixedly connected to the inner sidewalls of the two end plates respectively. All the arc-shaped blades are arranged in a uniform ring array around the center of the end plates, forming an annular air supply structure of an integrated impeller.

3. The high-balance cross-flow fan blade according to claim 1, characterized in that: Several reinforcing rings are evenly distributed along the axial direction of the arc-shaped blade, and the reinforcing rings are of a ring structure.

4. The high-balance cross-flow fan blade according to claim 1, characterized in that: The rotating shaft passes through the mounting bracket through the through hole in the support plate, and the rotating shaft and the through hole in the support plate are fitted with a clearance fit. The drive motor is fixed to the outside of the mounting bracket, and the output shaft of the drive motor is coaxially fixed with the rotating shaft to ensure smooth rotation and transmission of the rotating shaft.

5. The high-balance cross-flow fan blade according to claim 1, characterized in that: The convex key and the rotating shaft are integrally formed or detachably fixedly connected, and the convex key engages and matches with the keyway of the end plate.

6. The high-balance cross-flow fan blade according to claim 1, characterized in that: Several straightening blocks are arranged at intervals along the axial direction of the rotating shaft. The mounting holes of the straightening blocks are fixed with the rotating shaft by interference fit. The outer edge contour of the straightening blocks is adapted to the inner circle contour formed by the arc blades, and always maintains contact and fit with the inner edge of the arc blades.

7. The high-balance cross-flow fan blade according to claim 1, characterized in that: The straightening block has several flow-guiding and weight-reducing holes arranged in a ring array around the mounting hole. The flow-guiding and weight-reducing holes are circular through holes, and the diameter and spacing of each flow-guiding and weight-reducing hole are the same.

8. The high-balance cross-flow fan blade according to claim 1, characterized in that: The substrate and the two side support plates are integrally formed, and the pre-mounted holes are strip-shaped mounting holes, symmetrically distributed at both ends of the upper side of the substrate.

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