Motor support, fan and air conditioner outdoor unit

Abstract

The invention relates to the technical field of air conditioners. The invention discloses a motor support, a fan and an air conditioner outdoor unit. The motor support comprises an annular base and at least one supporting piece. The annular seat is used for installing a motor, and an output shaft of the motor is provided with an axial flow fan blade; one end of the supporting piece is connected with the annular base, and the other end of the supporting piece is fixedly installed in the air conditioner outdoor unit. Wherein the supporting piece comprises at least one supporting part, and the cross section of the supporting part is in an asymmetric wing shape. According to the axial-flow fan, the structure of the motor support is designed, so that the motor support has a rectification effect on the incoming air flow, the rectified incoming air flow passes through the axial-flow fan blades, load distribution on the axial-flow fan blades can be more uniform, meanwhile, part of vortexes can be reduced, and therefore the axial-flow fan blades are more uniform in load distribution while the efficiency of the axial-flow fan blades is improved, and the service life of the axial-flow fan blades is prolonged. And part of noise can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to a motor bracket, a fan and an air conditioner outdoor unit. Background Art

[0002] The fan is a key component in the outdoor unit of the air conditioner for forced air circulation to help the condenser dissipate heat. The fan generally includes a motor bracket, a motor and an axial fan blade. The motor is mounted on the motor bracket, and the axial fan blade is mounted on the output shaft of the motor. However, in actual design and operation, the position and structure of the motor bracket and the condenser may have a negative impact on the uniformity of the airflow flowing through the axial fan blade. When the outdoor unit of the air conditioner is working, the fan must overcome the resistance of air flow, suck air from the environment, pass through the condenser, and then discharge it. If the layout of the motor bracket and the condenser is not designed properly, local obstacles will be formed, causing the airflow to flow around to form vortices. The unevenness of the airflow speed and direction will increase the friction resistance and pressure drop of the flow; the vortex area will not only affect the efficiency of the fan, but also increase the noise; therefore, the motor bracket needs to ensure the stability of the motor during operation and reduce vibration and noise. If the motor bracket is not designed properly, it may excessively obstruct or guide the airflow, affecting the overall airflow distribution of the outdoor unit of the air conditioner; when the airflow passes through uneven obstacles, more turbulence and noise will be generated; the uneven flow of the axial fan blades will aggravate this phenomenon, resulting in an increase in overall operating noise. In order to reduce noise, air conditioner designers need to consider how to reduce the generation and propagation of eddy currents by optimizing structure and materials.

[0003] Therefore, in the design of the air conditioner outdoor unit, optimizing the position and shape of the motor bracket to ensure that it has the least impact on the airflow of the axial fan blades is the key to enhancing the overall performance of the air conditioning system. Generally, the prior art method generally adds a guide plate (such as a guide vane) to the motor bracket to help guide and rectify the airflow, so that the airflow is more uniform and stable. For example, the existing patent number CN118188577A discloses an axial fan blade for an axial fan, an axial fan, a motor bracket, an axial fan assembly and an air conditioner, and the shape structure of the motor bracket 1 is as follows: Figure 1 As shown, even if the guide vanes are added to the motor bracket 1. However, this method does not change the structure of the motor bracket 1, which still has a plate rib with a larger cross-section. When the airflow passes through, there will be greater wind resistance, and it is more likely to generate larger vortices. The motor bracket still forms a local obstacle, causing the airflow to flow around and form vortices. Summary of the invention

[0004] The purpose of the present invention is to provide a motor bracket, a fan and an air conditioner outdoor unit, aiming to solve the problem that the structural design of the existing motor bracket has large wind resistance when air flows through, easily forms local obstacles and generates eddies.

[0005] In order to solve the above technical problems, the object of the present invention is achieved through the following technical solutions: a motor bracket is provided, comprising:

[0006] An annular seat, used for mounting a motor, an output shaft of which is mounted an axial flow fan blade;

[0007] At least one supporting member, one end of which is connected to the annular seat and the other end of which is fixedly installed in the air conditioner outdoor unit;

[0008] Wherein, the support member comprises at least one support portion, and the cross section of the support portion is an asymmetric airfoil.

[0009] Furthermore, two support members are provided and are symmetrically arranged with the annular seat as the center.

[0010] Furthermore, the support member includes a mounting portion and two supporting portions; one end of the two supporting portions is connected to the outer periphery of the annular seat, and the other ends of the two supporting portions are connected to the mounting portion.

[0011] Furthermore, the motor bracket further comprises:

[0012] A first guide ring, mounted on the support member and coaxially arranged with the output shaft of the motor;

[0013] The first guide ring is located radially outside the annular seat, and the cross section of the first guide ring is an asymmetric airfoil.

[0014] Furthermore, the radius of the first guide ring is less than 0.3 times the radius of the axial flow fan blade.

[0015] Furthermore, the motor bracket further comprises:

[0016] a second guide ring connected to the support portion and located radially outside the first guide ring;

[0017] The cross section of the second guide ring is an asymmetric airfoil.

[0018] Furthermore, the radius of the second guide ring is greater than or equal to the radius of the axial flow fan blade.

[0019] Furthermore, a plurality of pre-rotors are provided between the first guide ring and the second guide ring, the cross section of the pre-rotors is an asymmetric airfoil, and the axial angle between the pre-rotors and the axial flow blades is an acute angle.

[0020] An embodiment of the present invention further provides a fan, which includes a motor, an axial flow fan blade and the motor bracket as described above, wherein the motor is mounted on the motor bracket, and the axial flow fan blade is mounted on the output shaft of the motor.

[0021] An embodiment of the present invention further provides an air-conditioning outdoor unit, which includes the fan as described above.

[0022] The beneficial effects of the embodiments of the present invention are as follows: the structure of the motor bracket is designed so that the motor bracket has a rectifying effect on the passing air flow. The rectified air flow then passes through the axial flow fan blades, which can make the load distribution on the axial flow fan blades more uniform and reduce some eddy currents, thereby improving the efficiency of the axial flow fan blades while reducing some noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of the structure of a motor bracket provided by the prior art.

[0025] Figure 2 A schematic structural diagram of some components (support structure) of a motor bracket provided in an embodiment of the present invention.

[0026] Figure 3 A schematic structural diagram of some components (first guide ring) in a motor bracket provided in an embodiment of the present invention.

[0027] Figure 4 A schematic structural diagram of a part of the components (second guide ring) in the motor bracket provided in an embodiment of the present invention.

[0028] Figure 5 A schematic diagram of the cross-sectional structure of a first guide ring provided in an embodiment of the present invention.

[0029] Figure 6 The embodiment of the present invention provides Figure 5 Schematic diagram of the enlarged structure of local A in FIG.

[0030] Figure 7 A schematic diagram of the overall structure of a motor bracket provided in an embodiment of the present invention.

[0031] Figure 8 A schematic diagram of the overall structure of a fan provided in an embodiment of the present invention.

[0032] Fig. 9 The embodiment of the present invention provides Figure 8 Schematic diagram of the enlarged structure of local B in FIG.

[0033] Fig.10A schematic diagram of the effect of the motor bracket provided in an embodiment of the present invention providing pre-swirl to the incoming air flow.

[0034] Fig.11 The figure is a comparison chart of noise data of the air conditioner outdoor unit under the same air volume between the motor bracket of the embodiment of the present invention and the prior art.

[0035] Description of the symbols in the figure:

[0036] 1. Motor bracket; 11. Annular seat; 12. Mounting part; 13. Support part; 14. First guide ring; 141. Annular inner side surface; 142. Annular outer side surface; 15. Second guide ring; 16. Pre-rotor;

[0037] 2. Axial flow fan blades. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0040] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0041] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0042] Combination Figure 2 , Figure 7 and Figure 8 The embodiment of the present invention provides a motor bracket 1, comprising:

[0043] The annular seat 11 is used to install a motor (not shown in the figure), and the axial flow fan blade 2 is installed on the output shaft of the motor;

[0044] At least one supporting member, one end of which is connected to the annular seat 11 and the other end of which is fixedly installed in the air conditioner outdoor unit;

[0045] The support member includes at least one support portion 13, and the cross section of the support portion 13 is an asymmetric airfoil.

[0046] In this embodiment, the motor bracket 1 is located in the flow direction of the axial flow fan blade 2, and the motor bracket 1 can provide support and fixation for the motor; specifically, the motor can be fixed on the annular seat 11 of the motor bracket 1, and the axial flow fan blade 2 is installed on the output shaft of the motor, and the motor provides driving power for the axial flow fan blade 2. When the air conditioner outdoor unit is working, the fan overcomes the resistance of air flow and sucks air from the external environment into the air conditioner outdoor unit. After the air passes through the condenser, due to the combined effect of the condenser shape and the fins, the unevenness of the air flow will increase. The uneven air continues to pass through the motor bracket 1 and then flows out from the axial flow fan blade 2, so it is easy to cause local obstruction and the risk of eddy current. For this reason, the structure of the motor bracket 1 is designed in this embodiment so that the motor bracket 1 has a rectifying effect on the incoming air flow. After the air flow after rectification passes through the axial flow fan blade 2, the load distribution on the axial flow fan blade 2 can be made more uniform, and at the same time, some eddy currents can be reduced, thereby improving the efficiency of the axial flow fan blade 2 while reducing some noise.

[0047] Specifically, the annular seat 11 serves as a supporting structure of the motor. The overall shape of the annular seat 11 can be a circular ring. The inner space of the annular seat 11 is used to install the motor. The shape of the inner space of the annular seat 11 can be adapted to the outer shape of the motor to facilitate stable assembly of the motor.

[0048] Specifically, the support member is the supporting structure of the entire motor bracket 1 (also the supporting structure of the entire fan), and is also an important structure that has a rectifying effect on the incoming air flow. For this reason, the present embodiment designs the support portion 13 as a rod-shaped structure. The cross-section of the rod-shaped structure is relatively small, and there will be no large wind resistance when the incoming air flows through. In order to further reduce the wind resistance, the rod-shaped cross-section of the support portion 13 is set to an asymmetric airfoil, which has a smaller shape resistance and can greatly reduce the resistance of the support member to the incoming flow of the axial flow fan blade 2; and because when the incoming air flows through the asymmetric airfoil, the airflow can be kept attached to the airfoil for as long as possible, delaying or preventing the separation of the airflow, thereby reducing the formation of the eddy current area, and further reducing the generation of some eddy current noise.

[0049] In some preferred embodiments, two support members are provided and are symmetrically arranged with the annular seat 11 as the center.

[0050] In this preferred embodiment, the entire fan can be kept stable by supporting and fixing the fan on two opposite sides with two supporting members.

[0051] In some preferred embodiments, each support member may include a mounting portion 12 and two supporting portions 13 ; one end of the two supporting portions 13 is connected to the outer periphery of the annular seat 11 , and the other end of the two supporting portions 13 is connected to the mounting portion 12 .

[0052] In this preferred embodiment, the mounting portion 12 may be a mounting strip, and the two supporting portions 13 may be independent and arranged opposite to each other, or the two supporting portions 13 may form a U-shaped structure.

[0053] In one embodiment, in order to further improve the rectifying effect of the motor bracket 1, as Figure 3 As shown, the motor bracket 1 may further include a first guide ring 14; the first guide ring 14 is installed on the support and is coaxially arranged with the output shaft of the motor; wherein the first guide ring 14 is located radially outside the annular seat 11, and the cross section of the first guide ring 14 is an asymmetric airfoil.

[0054] In this embodiment, the first guide ring 14 may be a circular ring structure, and the first guide ring 14 is fixedly connected to the support portion 13 of the motor bracket 1, thereby reducing the structural noise generated on the motor bracket 1 when the external unit is working, and playing a shock-absorbing role.

[0055] In one embodiment, in order to further improve the rectifying effect of the motor bracket 1, as Figure 4 As shown, the motor bracket 1 may further include a second guide ring 15 ; the second guide ring 15 is connected to the support portion 13 and is located radially outside the first guide ring 14 ; the cross section of the second guide ring 15 is an asymmetric airfoil.

[0056] In this embodiment, a second guide ring 15 is additionally provided at intervals on the radial outer side of the first guide ring 14 , which has the same function as the first guide ring 14 . The cooperation of the two can further reduce structural noise to improve the shock absorption effect.

[0057] The vibration reduction principle and mechanism of the first guide ring 14 and the second guide ring 15 are mainly reflected in the following aspects:

[0058] First, it can enhance structural rigidity: the annular structure can increase the overall rigidity of the structure. By introducing a closed-loop path into the structure, the material's ability to resist bending and torsional deformation can be effectively enhanced, reducing vibrations caused by structural flexibility and deformation.

[0059] Secondly, it can disperse vibration energy: the ring structure can disperse vibration energy through its geometric characteristics, so that the vibration propagates in multiple paths, achieving the effect of mutual cancellation or weakening. This multi-directional dispersion of energy reduces the accumulation of vibration amplitude in a specific direction, thereby reducing the overall vibration level.

[0060] Thirdly, multi-point support and balance can be achieved: annular structures usually have the characteristics of multi-point support, which can distribute external forces and internal stresses more evenly, avoid stress concentration, reduce the problem of excessive local amplitude, and overall improve the dynamic stability and vibration reduction capacity of the structure.

[0061] In addition, since the cross-sections of the first guide ring 14 and the second guide ring 15 are the same asymmetric airfoil, Figure 5 and Figure 6 Taking the cross section of the first guide ring 14 shown as an example, the inner side surface 141 of the first guide ring 14 is more curved than the outer side surface 142, so the air flow path of the inner side surface 141 is longer and the speed is faster. Therefore, the speed of the air flow will increase after passing through the first guide ring 14, so that when the fan speed remains unchanged, the air volume of the air conditioner outdoor unit will be increased to a certain extent.

[0062] In one embodiment, the radius of the first guide ring 14 is less than 0.3 times the radius of the axial flow fan blade 2 ; the radius of the second guide ring 15 is greater than or equal to the radius of the axial flow fan blade 2 .

[0063] In this embodiment, the radius of the first guide ring 14 and the radius of the second guide ring 15 are determined according to the distance between the axial flow fan blade 2 and the compressor compartment partition in the air conditioner outdoor unit. When the distance is large enough, it should be ensured that the annular area jointly formed by the first guide ring 14 and the second guide ring 15 can include the area with large air volume of the axial flow fan blade 2. Generally speaking, the air volume of the axial flow fan blade 2 will reach the maximum at the blade tip (blade tip, i.e., the maximum radius position). This is because the linear velocity at the blade tip is the largest, which can push a larger volume of air. The air volume near the center of the axial flow fan blade 2 (blade root, close to the rotation axis) is lower because the linear velocity here is smaller. Therefore, it is preferred to set the radius of the first guide ring 14 to be less than 0.3R (R is the radius of the axial flow fan blade 2), and the radius of the second guide ring 15 can range from R to 1.1R (preferably 1.1R). It is ideal that the first guide ring 14 and the second guide ring 15 together form a circular ring area starting from 0.3R to 1.1R, and the noise reduction and vibration reduction effects that can be achieved are better.

[0064] In one embodiment, in order to further improve the rectifying effect of the motor bracket 1, as Figures 7-10 As shown, a plurality of pre-rotor blades 16 are provided between the first guide ring 14 and the second guide ring 15 . The cross section of the pre-rotor blades 16 is an asymmetric airfoil, and the axial angle between the pre-rotor blades 16 and the axial flow blades 2 is an acute angle.

[0065] In this embodiment, the first guide ring 14 and the second guide ring 15 serve as supporting structures for the pre-rotor 16. A pre-rotor 16 can be arranged at a preset angle (preferably 60 degrees) on the annular area formed by the first guide ring 14 and the second guide ring 15. The pre-rotor 16 also has an asymmetric airfoil cross section, and the pre-rotor 16 is designed to have an acute angle with the axial direction of the axial flow blade 2 (see Figure 8 and Fig. 9 As shown), the acute angle preferably ranges from 5 to 15 degrees. The acute angle is designed to make the air flow in front of the axial flow fan blade 2 have an angle to adapt to the rotation of the axial flow fan blade 2.

[0066] For details, please refer to Fig.10 The figure shows the effect of the motor support 1 of this embodiment providing pre-rotation for the incoming air flow. A pre-rotated incoming air flow can be provided to the axial flow fan blades 2, that is, a certain rotation speed is given to the air flow before it reaches the axial flow fan blades 2, which can significantly optimize the aerodynamic performance of the fan, especially in terms of improving efficiency, reducing noise and controlling air flow distribution.

[0067] Specifically, the specific effects of the pre-swirling incoming flow on the performance improvement of the axial flow fan blade 2 are as follows:

[0068] First, the improvement in efficiency, which is mainly reflected in reducing flow losses and improving airflow distribution.

[0069] Among them, reducing flow loss means that the pre-swirling incoming flow can make the air flow have momentum consistent with the rotation direction of the axial flow fan blade 2 before reaching the axial flow fan blade 2, so that the relative speed difference between the axial flow fan blade 2 and the air flow can be reduced, thereby reducing the flow loss caused by air flow separation and turbulence, and improving the efficiency of the axial flow fan;

[0070] Among them, improving airflow distribution means that the pre-swirling flow helps balance the airflow at different radial positions of the axial flow fan blades 2, thereby optimizing the airflow distribution, avoiding or reducing local airflow blockage, allowing the blades to distribute the load more evenly, and further improving the overall efficiency.

[0071] Secondly, the improvement in noise reduction is mainly reflected in the smoothing of airflow and the control of resonance points.

[0072] The airflow smoothing means that the pre-swirling incoming flow helps to slow down the irregular movement of the airflow on the axial flow fan blade 2, reduce turbulence and airflow separation, and generate fewer sound waves when the airflow is smooth, thereby reducing noise;

[0073] Controlling the resonance point means that by optimizing the speed and direction of the incoming flow pre-swirl, the specific frequency at which the airflow excites the structural resonance can be avoided, thereby reducing noise generation.

[0074] The third aspect is to optimize the improvement on the boundary layer; it is mainly reflected in reducing airflow separation, specifically: the pre-swirling flow helps to maintain the attachment of the boundary layer and reduce the separation of the airflow on the surface of the axial flow fan blade 2, which not only reduces the resistance, but also helps to prevent the stall caused by airflow separation.

[0075] Fourthly, the improvement in reducing energy consumption is mainly reflected in the reduction of vibration and turbulence. Specifically, pre-swirl can alleviate the tip vortex and near-wall turbulence of the axial flow fan blade 2, reduce the additional energy consumption caused by vibration and turbulence, and thus save energy.

[0076] Based on the motor bracket 1 provided in the embodiment of the present invention, Fig.11 The figure shows a comparison of the noise data of the air conditioner outdoor unit of the motor bracket 1 of the present invention and the prior art under the same air volume. It can be seen that the motor bracket 1 of the embodiment of the present invention has lower noise under different air volumes.

[0077] The embodiment of the present invention further provides a fan, which includes a motor, an axial flow fan blade 2 and the motor bracket 1 as described above, wherein the motor is mounted on the motor bracket 1, and the axial flow fan blade 2 is mounted on the output shaft of the motor.

[0078] An embodiment of the present invention further provides an air-conditioning outdoor unit, which includes the fan as described above.

[0079] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A motor bracket, characterized in that: include: An annular seat, used for mounting a motor, an output shaft of which is mounted an axial flow fan blade; At least one supporting member, one end of which is connected to the annular seat and the other end of which is fixedly installed in the air conditioner outdoor unit; Wherein, the support member comprises at least one support portion, and the cross section of the support portion is an asymmetric airfoil.

2. The motor bracket according to claim 1, characterized in that: The support members are provided with two and are symmetrically arranged with the annular seat as the center.

3. The motor bracket according to claim 1 or 2, characterized in that: The support member comprises a mounting portion and two supporting portions; one end of the two supporting portions is connected to the outer periphery of the annular seat, and the other ends of the two supporting portions are connected to the mounting portion.

4. The motor bracket according to claim 1 or 2, characterized in that: Also includes: A first guide ring, mounted on the support member and coaxially arranged with the output shaft of the motor; The first guide ring is located radially outside the annular seat, and the cross section of the first guide ring is an asymmetric airfoil.

5. The motor bracket according to claim 4, characterized in that: The radius of the first guide ring is less than 0.3 times the radius of the axial flow fan blade.

6. The motor bracket according to claim 5, characterized in that: Also includes: a second guide ring connected to the support portion and located radially outside the first guide ring; The cross section of the second guide ring is an asymmetric airfoil.

7. The motor bracket according to claim 6, characterized in that: The radius of the second guide ring is greater than or equal to the radius of the axial flow fan blade.

8. The motor bracket according to claim 6, characterized in that: A plurality of pre-rotor blades are arranged between the first guide ring and the second guide ring. The cross section of the pre-rotor blades is an asymmetric airfoil, and the axial angle between the pre-rotor blades and the axial flow fan blades is an acute angle.

9. A fan, characterized in that: It comprises a motor, an axial flow fan blade and a motor bracket as described in any one of claims 1 to 8, wherein the motor is mounted on the motor bracket, and the axial flow fan blade is mounted on the output shaft of the motor.

10. An air conditioner outdoor unit, characterized in that: Comprising the fan as claimed in claim 9.

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