Motor support for axial flow fan

Abstract

The utility model relates to a motor support for an axial flow fan, the support comprises a support main body and a fixing part, the support main body comprises a connecting section, a reducing section, a first bending section and a second bending section which are arranged in sequence, and the connecting section is connected to a motor shell; the length of the gradual change area of the reducing section in the first direction is gradually reduced from inside to outside, the maximum length is not larger than the length of the connecting section in the first direction, the distance from the upper surface of the gradual change area to the impeller is gradually increased, and the minimum distance is larger than or equal to the distance from the upper surface of the connecting section to the impeller. The first bending section bends and extends in the direction away from the impeller, the length of the first bending section in the first direction is smaller than that of the connecting section in the first direction, and the second bending section bends in the direction close to the air duct and is connected to the fixing part. While reducing the vibration of the fan and improving the stability of the fan, the bracket is less in material consumption and lower in cost, and the distance between the upper surface of the bracket and the impeller is farther, so that the flow loss can be effectively reduced, and the efficiency of a fan system is improved.

Description

Technical Field

[0001] The utility model relates to an axial flow fan, in particular to a motor bracket for an axial flow fan. Background Art

[0002] An axial flow fan refers to a fan that operates in an axial flow manner, generating an air flow in the same direction as the axis of the fan blade. Axial flow fans are widely used, such as electric fans and the fans of the outdoor units of air conditioners, which operate in an axial flow manner. An axial flow fan generally includes a motor, a guide air ring, an impeller installed on the motor shaft and rotatably arranged in the guide air ring around its axis, a net cover covering the air outlet end of the guide air ring, and a plurality of motor brackets arranged at intervals in sequence around the circumference of the motor. One end of the motor bracket is connected to the motor, and the other end is connected to the guide cylinder for fixing the motor. The strength and rigidity of the motor bracket have an important impact on the vibration level of the axial flow fan.

[0003] In order to reduce the vibration of the fan and improve the stability and service life of the fan operation, the applicant designed a bracket assembly. Refer to CN 220452316 U. By making the main structure of the bracket tangent to the fan housing, the tangential force output by the motor is parallel to the extension direction of the main body of the bracket, so as to achieve the purpose of reducing the vibration of the fan, improving the stability and service life of the fan operation. However, with the application of this bracket assembly, the applicant found that the width of the bracket is large, resulting in a large overall weight and a relatively high manufacturing cost of the bracket assembly. Moreover, due to the large width of the bracket, its distance from the impeller is relatively close, which increases the intake loss to a certain extent and reduces the efficiency of the fan system. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a novel motor bracket for an axial flow fan, which can reduce the vibration of the fan and improve the stability of the fan, and at the same time has the advantages of simple structure, light weight, low manufacturing cost and small intake loss.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A motor bracket for an axial flow fan, the axial flow fan including a motor, an impeller mounted on the shaft of the motor and rotatable about its axis, and a guide vane cylinder surrounding the outer peripheral side of the impeller. The bracket includes a bracket main body tangent to the outer circumference of the motor housing and extending in the tangential direction, and a fixing portion connected between the bracket main body and the guide vane cylinder. There are a plurality of the brackets arranged at intervals in the circumferential direction of the motor housing. The bracket main body includes a connecting section, a diameter-changing section, a first bending section, and a second bending section arranged in sequence. The connecting section is connected to the motor housing. The diameter-changing section includes a gradual change region, the length of the gradual change region in the first direction gradually decreases from inside to outside, the maximum length of the gradual change region in the first direction is not greater than the length of the connecting section in the first direction, the distance from the upper surface of the gradual change region to the impeller gradually increases and the minimum distance is greater than or equal to the distance from the upper surface of the connecting section to the impeller. The first bending section bends and extends away from the impeller, and the length of the bending section in the first direction is less than the length of the connecting section in the first direction. The second bending section bends towards the guide vane cylinder and is connected to the fixing portion.

[0007] In the present utility model, the bracket main body is still designed to be tangent to the motor housing, so that the tangential force output by the motor is parallel to the extending direction of the bracket main body, so that the forces generated after the movement of the fan rotor system can cancel out some components with each other on each bracket, effectively reducing the vibration of the fan. Further, through the structural design of the connecting section, the connection stability between the bracket and the motor housing is ensured. Through the structural designs of the diameter-changing section and the first bending section, without increasing the vibration of the fan, the material consumption can be reduced, the weight of the bracket can be reduced, the cost of the bracket can be reduced, and at the same time, the flow loss can be reduced and the efficiency of the fan system can be improved. Unless otherwise specified, the first direction in this article is parallel to the axial direction of the motor.

[0008] Preferably, the length of the connecting section in the first direction is H1, the minimum length of the gradual change region in the first direction is H2, and the length of the first bending section in the first direction is H3, where H2 = 0.4H1 to 0.6H1, and H3 = 0.4H1 to 0.6H1. Since the motor, the guide vane cylinder, and the impeller have a certain weight, when H2 and H3 are too small, the bracket cannot well support the motor, the guide vane cylinder, and the impeller, and there is a risk of damage after long-term operation; while when H2 and H3 are too large, although the supportability is better, the material cost increases and the intake flow loss is greater. Therefore, H2 and H3 cannot be too large or too small, and the above range is preferably selected.

[0009] Preferably, the included angle between the first bent section and the first direction is 80 - 88°, more preferably 84 - 88°, and even more preferably 85 - 87°. The setting of the first bent section further increases the distance between the bracket and the impeller, which is beneficial to reducing flow loss. Moreover, by setting its bending angle, the structural strength can be improved.

[0010] Preferably, the length of the first bent section in its corresponding tangent direction accounts for 0.35 - 0.55 of the total length of the bracket body in this tangent direction, more preferably 0.4 - 0.5. By setting the length of the first bent section in its corresponding tangent direction, the structural strength is ensured while minimizing flow loss as much as possible.

[0011] Preferably, the reduced-diameter section further includes a straight section, which is located between the gradually changing section and the first bent section. The setting of the straight section further increases the support strength of the bracket.

[0012] More preferably, the length of the straight section in its corresponding tangent direction accounts for 1 / 2 - 2 / 3 of the total length of the reduced-diameter section in this tangent direction.

[0013] Preferably, the length of the connecting section in its corresponding tangent direction < the length of the second bent section in its corresponding tangent direction ≤ the length of the reduced-diameter section in its corresponding tangent direction < the length of the first bent section in its corresponding tangent direction.

[0014] In some embodiments, the length of the connecting section in its corresponding tangent direction is L1, the length of the second bent section in its corresponding tangent direction is L2, the length of the reduced-diameter section in its corresponding tangent direction is L3, the length of the first bent section in its corresponding tangent direction is L4, and the total length of the bracket body in its corresponding tangent direction is L0. L1 = 0.02L0 - 0.1L0, L2 = 0.2L0 - 0.3L0, L3 = 0.2L0 - 0.3L0, L4 = 0.4L0 - 0.5L0.

[0015] Preferably, the length of the connecting section in the first direction accounts for 1 / 2 - 2 / 3 of the total length of the motor housing in the first direction.

[0016] Preferably, the bracket body is sheet-shaped.

[0017] Preferably, the thickness of the bracket body is θ / mm, and the total mass of the motor and the impeller is M / kg, where 0.145 ≤ θ / M ≤ 0.23.

[0018] Preferably, the bracket body and the fixing part are integrally formed.

[0019] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0020] While the bracket of the utility model meets the requirements of reducing the vibration of the fan and improving the stability of the fan, it uses less materials and has a lower cost. Moreover, the distance between the upper surface of the bracket and the impeller is farther, which can effectively reduce the flow loss and improve the efficiency of the fan system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of the fan system of Embodiment 1;

[0023] Figure 2 It is an exploded view of the structure of the fan system of Embodiment 1;

[0024] Figure 3 It is a schematic structural diagram of the bracket of Embodiment 1;

[0025] Wherein: 1. Bracket; 11. Connection section; 12. Reducing section; 121. Gradual change area; 122. Straight section; 13. First bending section; 14. Second bending section; 15. Fixing part;

[0026] 2. Motor; 21. Housing; 22. Shaft;

[0027] 3. Impeller;

[0028] 4. Air guide cylinder; 41. Dust-proof net;

[0029] H1. The length of the connection section in the first direction; H2. The minimum length of the gradual change area in the first direction; H3. The length of the first bending section in the first direction; L0. The total length of the bracket body in its corresponding tangent direction; L1. The length of the connection section in its corresponding tangent direction; L2. The length of the second bending section in its corresponding tangent direction; L3. The length of the reducing section in its corresponding tangent direction; L4. The length of the first bending section in its corresponding tangent direction; a. The angle between the first bending section and the first direction;

[0030] x. First direction; y. Second direction. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The following further describes the present utility model in conjunction with the embodiments shown in the drawings.

[0032] In the following text, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and the description are considered to be exemplary in nature and not restrictive.

[0033] In the description of the embodiments of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0034] In the embodiments of the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0035] The following disclosure provides many different embodiments or examples for implementing different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the embodiments of the present invention. In addition, the embodiments of the present invention may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0036] Embodiment 1

[0037] A fan system, such as Figure 1 and Figure 2As shown, it includes a motor 2, an impeller 3, a wind guide cylinder 4, a bracket 1, and a dust-proof net 41. The motor 2 includes a main body part, a housing 21 surrounding the outside of the main body part, and a shaft 22 extending from the main body part and controllably rotating along its own axis; the impeller 3 is installed on the shaft 22 and can rotate around the axis of the shaft 22 driven by the shaft 22; the wind guide cylinder 4 includes a cylinder body surrounding the outer peripheral side of the impeller 3 and coaxial with the shaft 22 of the motor 2, and a mounting seat connected to the air inlet end of the cylinder body and extending radially outward along the cylinder body. The dust-proof net 41 covers the air outlet end of the cylinder body. The two ends of the bracket 1 are respectively fixedly connected to the housing 21 of the motor 2 and the mounting seat of the wind guide cylinder 4. The specific structures of the impeller 3, the wind guide cylinder 4, and the dust-proof net 41 refer to the prior art and are not specifically limited in this application. The bracket 1 in this application will be further described below.

[0038] For the brackets in the prior art, such as the bracket disclosed in the patent (CN 220452316 U) applied by the applicant on August 28, 2023, although it effectively reduces the vibration of the fan and improves the stability and service life of the fan operation, the bracket uses a lot of materials, resulting in a large weight and high cost. In order to reduce the material used for the bracket, the applicant tried to punch holes in the bracket. However, the weight reduction is not obvious. The applicant also tried to make the bracket narrower (i.e., reduce the length of the bracket in the first direction). Since the motor, impeller, wind guide cylinder, and dust-proof net have a certain weight, making the bracket narrower easily affects the supportability of the bracket. Through a large number of experimental studies, the applicant found that when not reducing the width of the bracket (i.e., the length in the first direction) at the connection between the bracket and the motor, setting a bending structure on the main body of the bracket can increase the support strength of the main body part of the bracket. Even if the width of the middle part of the bracket is reduced, good supportability can still be ensured. Further, through the improvement of the main body structure of the bracket, the flow loss can also be reduced, thereby improving the total pressure efficiency of the working point of the fan system.

[0039] Specifically, there are multiple brackets 1 arranged at intervals in the circumferential direction of the housing 21 of the motor 2, preferably 3 to 6. In this embodiment, there are 4 brackets 1. Taking one of the brackets 1 as an example, as Figure 3As shown in the figure, the bracket 1 includes a bracket body that is tangent to the outer circumference of the housing 21 of the motor 2 and extends in the tangential direction (i.e., the second direction y), and a fixing portion 15 connected between the bracket body and the air guide cylinder 4. The fixing portion 15 is fixedly connected to the mounting seat of the air guide cylinder 4, and the bracket body and the fixing portion 15 are preferably integrally formed. The bracket body is sheet-shaped and includes a connecting section 11, a diameter-changing section 12, a first bending section 13, and a second bending section 14 arranged in sequence from the inside to the outside. Among them, the connecting section 11 is connected to the housing 21 of the motor 2, and the specific connection method can refer to the prior art (such as patent CN 220452316 U); the diameter-changing section 12 includes a gradual change region 121 and a flat region 122. The length of the gradual change region 121 in the first direction x gradually decreases from the inside to the outside, and the maximum length of the gradual change region 121 in the first direction x is not greater than the length H1 of the connecting section in the first direction. The distance from the upper surface of the gradual change region 121 to the impeller 3 gradually increases and the minimum distance is greater than or equal to the distance from the upper surface of the connecting section 11 to the impeller 3; the first bending section 13 bends and extends away from the impeller 3, and the length H3 of the first bending section in the first direction is less than the length H1 of the connecting section in the first direction; the second bending section 14 bends towards the air guide cylinder 4 and is connected to the fixing portion 15.

[0040] Further, the length H1 of the connecting section in the first direction accounts for 1 / 2 to 2 / 3 of the total length of the housing 21 of the motor 2 in the first direction x, and the minimum length H2 of the gradual change region in the first direction and the length H3 of the first bending section in the first direction satisfy: H2 = 0.4H1 to 0.6H1, H3 = 0.4H1 to 0.6H1. By setting H1, H2, and H3, while ensuring the connection stability and support of the bracket 1, less material is used. The length L1 of the connecting section in its corresponding tangent direction < the length L2 of the second bending section in its corresponding tangent direction ≤ the length L3 of the diameter-changing section in its corresponding tangent direction < the length L4 of the first bending section in its corresponding tangent direction, preferably L1 = 0.02L0 to 0.1L0, L2 = 0.2L0 to 0.3L0, L3 = 0.2L0 to 0.3L0, L4 = 0.4L0 to 0.5L0. The length of the flat region 122 in its corresponding tangent direction accounts for 1 / 2 to 2 / 3 of the total length of the diameter-changing section 12 in this tangent direction.

[0041] The angle a between the first bending section and the first direction is 80 to 88°. In this embodiment, the angle a between the first bending section and the first direction is 86°. The setting of the first bending section 13 further increases the distance between the bracket 1 and the impeller 3, which is beneficial to reducing flow loss, and by setting its bending angle, the structural strength can be improved.

[0042] The thickness of the bracket body is θ / mm, and the total mass of the motor 2 and the impeller 3 is M / kg. θ and M satisfy the following formula: 0.145 ≤ θ / M ≤ 0.23.

[0043] The applicant compared the bracket 1 in Example 1 with the bracket 1 in Patent CN 220452316 U, and the results are shown in Table 1 below.

[0044] Table 1

[0045] Full pressure efficiency at the operating point (%) Sound pressure level (dB(A)) Weight of bracket 1 (g) CN 220452316U 48％ 78.2 1768 Example 1 49.5％ 77 1191

[0046] It can be seen that the bracket 1 of the present application not only reduces the total weight by 32.6%, greatly reducing the raw material cost of the bracket 1, but also reduces the intake loss, improves the aerodynamic efficiency of the fan system by 1.5%, and reduces the noise of the fan system by 1.2 dB(A).

[0047] The above embodiments are only used to illustrate the technical concept and features of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. It should not be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A motor bracket for an axial flow fan, the axial flow fan comprising a motor (2), an impeller (3) mounted on a shaft (22) of the motor (2) and rotatable about its axis, and a guide vane cylinder (4) surrounding the outer peripheral side of the impeller (3), the bracket (1) comprising a bracket main body tangent to the outer circumference of the housing (21) of the motor (2) and extending in the tangential direction, and a fixing portion (15) connected between the bracket main body and the guide vane cylinder (4), the brackets (1) being provided in a plurality spaced circumferentially along the housing (21) of the motor (2), characterized in that: The bracket body includes a connecting section (11), a diameter-changing section (12), a first bending section (13), and a second bending section (14) arranged in sequence. The connecting section (11) is connected to the outer shell (21) of the motor (2). The diameter-changing section (12) includes a gradual change region (121). The length of the gradual change region (121) in the first direction (x) gradually decreases from inside to outside. The maximum length of the gradual change region (121) in the first direction (x) is not greater than the length of the connecting section (11) in the first direction (x). The distance from the upper surface of the gradual change region (121) to the impeller (3) gradually increases, and the minimum distance is greater than or equal to the distance from the upper surface of the connecting section (11) to the impeller (3). The first bending section (13) bends and extends away from the impeller (3). The length of the first bending section (13) in the first direction (x) is less than the length of the connecting section (11) in the first direction (x). The second bending section (14) bends towards the air guide cylinder (4) and is connected to the fixing portion (15).

2. The motor bracket for an axial flow fan according to claim 1, characterized in that: The length of the connecting section (11) in the first direction (x) is H1, the minimum length of the gradual change region (121) in the first direction (x) is H2, and the length of the first bending section (13) in the first direction (x) is H3. Wherein, H2 = 0.4H1 to 0.6H1, H3 = 0.4H1 to 0.6H1.

3. The motor bracket for an axial flow fan according to claim 1, characterized in that: The included angle (a) between the first bending section and the first direction is 80 to 88°.

4. The motor bracket for an axial flow fan according to claim 1 or 3, characterized in that: The length of the first bending section (13) in its corresponding tangent direction accounts for 0.35 to 0.55 of the total length of the bracket body in this tangent direction.

5. The motor bracket for an axial flow fan according to claim 1, characterized in that: The diameter-changing section (12) further includes a straight region (122). The straight region (122) is located between the gradual change region (121) and the first bending section (13).

6. The motor bracket for an axial flow fan according to claim 5, wherein: The length of the straight region (122) in its corresponding tangent direction accounts for 1 / 2 to 2 / 3 of the total length of the diameter-changing section (12) in this tangent direction.

7. The motor bracket for an axial flow fan according to claim 1, characterized in that: The length (L1) of the connecting section in its corresponding tangent direction < the length (L2) of the second bending section in its corresponding tangent direction ≤ the length (L3) of the diameter-changing section in its corresponding tangent direction < the length (L4) of the first bending section in its corresponding tangent direction.

8. The motor bracket for an axial flow fan according to claim 1, wherein: The length of the connecting section (11) in the first direction (x) accounts for 1 / 2 to 2 / 3 of the total length of the outer shell (21) of the motor (2) in the first direction (x).

9. The motor bracket for an axial flow fan according to claim 1, characterized in that: The bracket body is sheet-shaped.

10. The motor support for an axial flow fan according to claim 1, characterized in that: The bracket body and the fixing portion (15) are integrally formed.

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