Efficient outer rotor fan

Abstract

The invention relates to the technical field of fans, and discloses an efficient outer rotor fan which comprises an impeller module, a support module and a motor module, the motor module is detachably installed in the support module, the impeller module is fixedly connected to the motor module, the impeller module comprises a fan blade hub and blades, and the fan blade hub is fixedly connected to the motor module. Under the combined action of the efficient curved surface of the impeller and the rear guide vane of the air guide ring, firstly, airflow with a rotational component flows out of the impeller under the guidance of the blades, the circular motion of the airflow is efficiently converted into axial motion, and the axial motion of the airflow with the rotational component flows out of the rear guide vane of the air guide ring. And then the rear guide vane can accurately guide airflow flowing out of the impeller, redundant rotation components in the airflow are converted into axial flow, airflow turbulence and energy loss are effectively reduced, the ventilation effect is improved, and the large range is achieved by adjusting the airflow direction and improving the airflow directionality.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and particularly to an efficient external rotor fan. Background Art

[0002] A fan is a general mechanical device that converts mechanical energy into gas energy and realizes the directional transportation of gas, and is widely used in many fields such as industry, construction, agriculture, transportation and energy. According to the working principle, fans can be divided into positive displacement, turbomachinery and jet types; according to their uses, they can be divided into fans for industrial boilers, fans for tunnels, general exhaust fans, etc.; according to the air flow direction, they can be divided into centrifugal fans, axial fans, mixed-flow fans, etc. In the industrial field, fans are used for ventilation, dust removal and cooling.

[0003] Due to structural and performance limitations, the range of traditional fans is relatively short. In scenarios where long-distance gas transportation is required, multiple fans are often needed to relay to meet the demand, and even some practical applications with strict requirements for the range cannot be satisfied. Moreover, nowadays. Summary of the Invention

[0004] To solve the above problems existing in the prior art, the present invention provides an efficient external rotor fan, which has the advantages of improving the range and air volume of the fan.

[0005] To achieve the above purpose of improving the range and air volume of the fan, the present invention provides the following technical solutions: including an impeller module, a bracket module and a motor module, the motor module is detachably installed in the bracket module, and the impeller module is fixedly connected to the motor module; The impeller module includes a fan blade hub and blades, the fan blade hub is installed on the motor module, and the blades are fixedly installed on the outer peripheral side of the fan blade hub; The bracket module includes a guide vane ring, a guide vane hub and rear guide vanes. The guide vane hub is arranged at the center of the guide vane ring, and the guide vane hub is connected to the inner wall of the guide vane ring through the rear guide vanes, and the motor module is installed in the guide vane hub.

[0006] Preferably, there are at least two blades, which are circumferentially distributed on the outer peripheral side of the fan blade hub. The blades are curved, the blades gradually become larger from the inside to the outside, and the outer edge of the blade is provided with a flanging.

[0007] Preferably, a plurality of strip-shaped grooves are arranged on one curved surface of the blade, and a serrated tail is also arranged on one side surface of the blade.

[0008] Preferably, the two inner circles of the guide vane ring are respectively an air inlet cut and a diffuser. The air inlet cut is an arc-shaped surface, the diffuser is an inclined surface, and a reinforcing rib is fixedly installed on the outer peripheral side of the guide vane ring.

[0009] Preferably, a plurality of trailing guide vanes are provided, which are circumferentially and uniformly distributed on the outer peripheral side of the guide vane hub, and the trailing guide vanes are distributed obliquely clockwise.

[0010] Preferably, a diffuser rib is further provided at the connection between the trailing guide vane and the inner wall of the air guide ring.

[0011] Preferably, at least two heat dissipation holes are further formed on the side end face of the guide vane hub, and a cavity is provided on the other side of the guide vane hub, and a plurality of shock-absorbing strips are provided inside the cavity.

[0012] Preferably, the motor module includes a motor rotor housing, a mounting flange and a motor. The motor is detachably mounted in the bracket module. The mounting flange and the motor rotor housing are used to mount the impeller module, and the three rotate synchronously with the motor rotor housing.

[0013] Preferably, a mesh cover is further mounted on the side wall of the air guide ring. The mesh cover is of an annular mesh structure, and a plurality of mounting pins are provided on its outer peripheral side. The mesh cover is fixed on the bracket air guide ring through the mounting pins, and the mesh hole gap of the mesh cover is 9.5 mm.

[0014] Compared with the prior art, the present invention provides an efficient outer rotor fan, which has the following beneficial effects: 1. For this efficient outer rotor fan, under the combined action of the efficient curved surface of the impeller and the trailing guide vanes of the air guide ring, first, the air flow with a rotational component flows out of the impeller through the guidance of the blades, and its circumferential motion is efficiently converted into axial motion. Then, the trailing guide vanes can accurately guide the air flow flowing out of the impeller, convert the excess rotational component in the air flow into axial flow, effectively reduce the turbulence and energy loss of the air flow, thereby improving the ventilation effect. By adjusting the air flow direction, the directivity of the air flow is improved, so as to achieve a large shooting range.

[0015] 2. This efficient outer rotor fan is composed of four main components: a motor, an impeller, a mesh cover and an air guide ring. This modular structural design enables each component to be independently produced, tested and replaced. During the production process, it is convenient to achieve specialized division of labor, improve production efficiency and product quality; during maintenance and repair, the faulty component can be quickly located and replaced, reducing the downtime, improving the availability of the equipment, and reducing the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional structural schematic diagram of the present invention; Figure 2 is a semi-sectional structural schematic diagram of the present invention; Figure 3 is a structural schematic diagram of the impeller module of the present invention; Figure 4Schematic structural diagram of the support module of the present invention; Figure 5 Schematic explosion structure diagram of the present invention; Figure 6 Schematic structural diagram of the impeller shock-absorbing groove of the present invention; Figure 7 Schematic structural diagram of the diffuser of the present invention; Figure 8 Schematic structural diagram of the wire notch of the air guide ring of the present invention; Figure 9 Schematic structural diagram of the bottom reinforcement of the air guide ring of the present invention; Figure 10 Schematic cross-sectional structure diagram of the rear guide vanes with different diameters of the air guide ring of the present invention Figure 11 Schematic diagram of the fan noise comparison of the present invention Figure 12 Schematic cross-sectional structure diagram of the blades at different diameters of the present invention.

[0017] In the figure: 10, air guide ring; 101, air inlet cut; 102, diffuser; 103, reinforcing rib; 20, fan blade hub; 201, blade; 2011, strip groove; 2012, serrated tail; 30, guide vane hub; 301, rear guide vane; 3011, diffusing rib; 302, heat dissipation hole; 40, motor rotor housing; 41, mounting flange; 42, motor; 50, wire mesh cover. Specific embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] Such as Figures 1-5As shown in the figure, it includes an impeller module, a bracket module, and a motor module, and also includes a wire mesh cover 50. The wire mesh cover 50 is installed on the side wall of the air guide ring 10. The wire mesh cover 50 is an annular mesh structure, and a plurality of mounting pins are provided on its outer peripheral side. The wire mesh cover 50 is fixed on the bracket air guide ring 10 through the mounting pins. The mesh gap of the wire mesh cover 50 is 9.5 mm. The wire mesh cover is made of a wire ring. This structure has high strength and toughness, can effectively block larger sundries and foreign objects from entering the blower interior, and protect the motor and impeller from damage. At the same time, it can also prevent people from directly contacting the high-speed rotating impeller and avoid injury. The mesh gap of the wire mesh cover is 9.5 mm, which can prevent a human hand from passing through the wire mesh cover and meet the safety standard design requirements. The motor module is detachably installed in the bracket module, and the impeller module is fixedly connected to the motor module. The blower is composed of four main components: a motor, an impeller, a wire mesh cover, and an air guide ring. This modular structural design enables each component to be independently produced, tested, and replaced. During the production process, it is convenient to achieve specialized division of labor, improve production efficiency and product quality; during maintenance and repair, the faulty component can be quickly located and replaced, reducing downtime, improving the availability of the equipment, and reducing maintenance costs.

[0020] The motor module includes a motor rotor housing 40, a mounting flange 41, and a motor 42. The motor 42 is detachably installed in the bracket module. The mounting flange 41 and the motor rotor housing 40 are used to install the impeller module, and the three rotate synchronously with the motor rotor housing 40. Embodiment 1

[0021] The impeller module includes a fan blade hub 20 and blades 201. The fan blade hub 20 is installed on the motor module, and the blades 201 are fixedly installed on the outer peripheral side of the fan blade hub 20. There are at least two blades 201, which are circumferentially distributed on the outer peripheral side of the fan blade hub 20. The blades 201 are curved surfaces. The blades 201 gradually increase from the inside to the outside, and the outer edge of the blade 201 is flanged. The curved blades 201 optimize the interaction between the blades and the air flow. During the rotation of the impeller, the air flow can more smoothly adhere to the blade surface, reduce the air flow separation and turbulence phenomena, and improve the work efficiency of the blades on the air flow.

[0022] As Figure 12 shown, taking the center of the middle hole of the air guide ring as the center of the circle, establish cylindrical surfaces of Φ200, Φ260, Φ320, Φ380, Φ440, which intersect with the impeller surface respectively. The intersection cross-sections are as Figure 12 shown. Make a line segment from the bottom to the top center of the cross-section, and make a ray to the right with the left point of the line segment as the endpoint. The included angle between the ray and the line segment is Δ, 10 degrees ≤ Δ ≤ 60 degrees, and the length of the line segment is C, 60 ≤ C ≤ 300 mm.

[0023] Among them, for the impeller of this application: at the cross-section of Φ200, Δ = 23 degrees and C = 83.1 mm; at the cross-section of Φ260, Δ = 21 degrees and C = 98.8 mm; at the cross-section of Φ320, Δ = 20 degrees and C = 119.4 mm; at the cross-section of Φ380, Δ = 19 degrees and C = 141.1 mm; at the cross-section of Φ440, Δ = 18 degrees and C = 157.9 mm.

[0024] The blade design that gradually increases from the inside to the outside conforms to the diffusion law of the air flow during rotation, making the air flow more natural and reducing energy loss. This design increases the ventilation efficiency of the fan by 15% - 20% compared with the traditional impeller. While meeting the ventilation requirements, it effectively reduces energy consumption and achieves the dual goals of energy conservation and high efficiency. The downward flanging on the outer side of the blade plays a good guiding and constraining role on the air flow. It guides the air flow to flow more concentratedly towards the fan outlet, reduces the radial diffusion of the air flow, and improves the air outlet efficiency and air flow directivity.

[0025] On one curved surface of the blade 201, a number of strip-shaped grooves 2011 are provided, and on one side surface of the blade 201, a serrated tail 2012 is also provided. The single distribution trajectory extends from the outside of the blade leading edge to the inside of the blade trailing edge; as Figure 6 shown, the center distance between the grooves is D, and its range is 5 - 30 mm; the distance is F, and its range is 2 - 15 mm; the width of the damping groove is E, and its range is 8 - 80 mm. D, E, and F are all fixed values, and D = E + F. In the blade 201 of this application, the width of the damping groove E = 7 mm, the distance F = 5 mm, the center distance D = 12 mm, and the depth is 1 mm.

[0026] The noise reduction groove on the back of the impeller and the serrated design at the trailing edge of the blade work together to greatly reduce the operating noise of the fan. The noise reduction groove disrupts the air flow on the back of the impeller, destroys the formation of large-scale eddies, and reduces the noise generated when the eddies shed. The serrations at the trailing edge of the blade cut the air flow separated from the blade surface into small air flows, dispersing the energy during air flow separation and further reducing the noise. The fan noise test is as Figure 11 shown. Compared with the comparison fan, the overall noise drops by 2.25 dB.

[0027] The support module includes a guide vane ring 10, a guide vane hub 30, and a rear guide vane 301. Among them, the guide vane hub 30 is arranged at the center of the guide vane ring 10. The guide vane hub 30 is connected to the inner wall of the guide vane ring 10 through the rear guide vane 301. The motor module is installed inside the guide vane hub 30. At both inner rings of the guide vane ring 10, there are an air inlet notch 101 and a diffuser 102 respectively. Among them, the air inlet notch 101 is set as an arc surface, and the diffuser 102 is set as an inclined surface. A reinforcing rib 103 is also fixedly installed on the outer peripheral side of the guide vane ring 10. The setting of the air inlet notch 101 effectively reduces the length and width dimensions of the fan without affecting the ventilation performance of the fan, achieving the compact design of the fan, asFigure 7 As shown, the cross-sectional diffusion angle of the diffuser 102 is α, and its range is 3° - 15°. The height of the diffuser is H, where 10 ≦ H ≦ 200 mm. In this application, α is 11° and the height is 50 mm. The setting of the diffuser 102 enables the air flow to enter the diffuser 102 after being accelerated by the impeller and the rear guide vane. Since the cross-sectional area of the diffuser 102 gradually increases, the air flow velocity decreases. According to the principle of energy conversion, the kinetic energy of the air flow is converted into pressure energy, thereby increasing the static pressure of the fan and enabling the air to be transported to a farther distance.

[0028] A number of rear guide vanes 301 are provided, which are all circumferentially and evenly distributed on the outer peripheral side of the guide vane hub 30. Moreover, the rear guide vanes 301 are distributed obliquely clockwise. The setting of the rear guide vanes 301 can accurately guide the air flow flowing out from the impeller, convert the excess rotational component in the air flow into axial flow, and effectively reduce the turbulence and energy loss of the air flow. Through the carefully designed shape and angle of the rear guide vanes, the air flow can pass through more evenly and smoothly, increasing the static pressure and efficiency of the fan, and improving the ventilation efficiency of the air guide ring by 10% - 15%.

[0029] As Figure 10 shown, taking the center of the middle hole of the air guide ring as the center of the circle, cylindrical surfaces with diameters of Φ200, Φ250, Φ300, Φ350, Φ400, and Φ450 are established, which intersect with the rear guide vanes of the air guide ring respectively. A line segment is made from the bottom to the top center of the intersection cross-section, and a ray is made to the right with the left point of the line segment as the endpoint. The included angle between the ray and the line segment is γ, where 40 ≦ γ ≦ 80, and the length of the line segment is c, where 15 ≦ c ≦ 80.

[0030] For the air guide ring of this application: at the Φ200 cross-section, γ = 67 degrees and c = 26.1 mm; at the Φ250 cross-section, γ = 62 degrees and c = 26.4 mm; at the Φ300 cross-section, γ = 59 degrees and c = 26.9 mm; at the Φ350 cross-section, γ = 57 degrees and c = 26.4 mm; at the Φ400 cross-section, γ = 55 degrees and c = 26.0 mm; at the Φ450 cross-section, γ = 51 degrees and c = 25.1 mm.

[0031] A diffusion rib 3011 is also provided at the connection between the rear guide vane 301 and the inner wall of the air guide ring 10. By setting the diffusion rib 3011, on the one hand, it is to strengthen the connection strength between the rear guide vane and the side wall of the air guide ring and increase the service life; on the other hand, it is to facilitate mold opening. If the air guide ring does not have this strengthening structure, an additional core-pulling structure needs to be designed in the mold, and the cost will increase significantly. Conversely, after adding this structure, the mold only needs to have a conventional opening and closing structure to form this structure, and the cost will decrease significantly.

[0032] There is also a notch provided on the air guide ring 10, and a wire is installed in the notch. As Figure 8As shown, a notch is reserved on the side wall. The width of the notch is a, where 5 ≤ a ≤ 12, the depth is b, where 5 ≤ b ≤ 100, and the angle is β, where 10 ≤ β ≤ 80. In this application, a = 8, b = 42, and β = 45, and it extends to the left to the bottom. The advantage of this structure is that the motor lead wire with a terminal can be directly installed on the air guide ring. Compared with the traditional reserved wire passing hole, this notch can avoid the traditional hole penetrating the fan and being too large, which weakens the function of the diffuser, forms leakage, and causes air leakage at this position.

[0033] A strengthening structure is also provided on the outer peripheral side of the bottom of the air guide ring 10. The strengthening structure is formed by multiple curves intersecting with each other, as Figure 9 shown. The curve change trajectory of the bottom strengthening structure conforms to: the distance SDn from the scanning section to the scanning trajectory = A + B * sin(n * 360 * trajpar), where: A is the base distance; B is the amplitude; n is the cycle period; trajpar refers to the value of the system variable from 0 to 1.

[0034] In this application: SD1 = 0 + 21 * sin(trajpar * 360 * 1.5), SD1 = 0 - 21 * sin(trajpar * 360 * 1.5) The stability of the air guide ring during installation and fixation can be improved through the bottom strengthening structure. During use, the air guide ring needs to bear its own weight, the vibration during the operation of the fan, and the acting force of the air flow, etc. The bottom strengthening structure can disperse these acting forces, prevent the air guide ring from deforming or loosening on the installation surface, and ensure its tight combination with the installation foundation. This not only ensures the safety of the fan operation, but also reduces the noise and performance degradation problems caused by unstable installation, extends the service life of the air guide ring and the fan, and provides a more reliable ventilation device for users.

[0035] At least two heat dissipation holes 302 are also opened on the side end face of the guide vane hub 30. A cavity is provided on the other side of the guide vane hub 30, and several shock-absorbing strips are arranged inside the cavity, which can effectively shock-absorb the motor during the installation of the motor and extend the service life of the fan.

[0036] Among them, the impeller rotates counterclockwise, and the rear guide vanes are distributed clockwise. Therefore, through the combined action of the high-efficiency curved surface of the impeller and the rear guide vanes of the air guide ring, first, the air flow with a rotational component flows out from the impeller under the guidance of the blades 201, and its circumferential motion is efficiently converted into axial motion. Then, through the rear guide vanes 301, the air flow flowing out from the impeller can be accurately guided, and the excess rotational component in the air flow is converted into axial flow, effectively reducing the air flow disorder and energy loss, thereby improving the ventilation effect. By adjusting the air flow direction, the directivity of the air flow is improved, and thus a large shooting range is achieved. Embodiment 2

[0037] The blades 201 of the impeller can also be arranged as straight surfaces, which are obliquely installed on the impeller hub 20. The ends of the blades 201 are bent towards one side, and the bending surface is consistent with the bending surface of the air inlet cut 101, so as to reduce the gap between the blades 201 and the air guide ring 10 when the fan rotates, thereby reducing the turbulence generated by the air flow entering this gap, and ensuring the stability of the fan.

[0038] Working principle: The motor 42 on the motor set is installed in the guide vane hub 30. The impeller is installed on the motor shaft of the motor 42 through the motor rotor housing 40 and the mounting flange 41. Then, the air inlet ring 202 on the impeller is sleeved on the inner wall of the bracket 10, and then the mesh cover 50 is installed on the other side of the bracket 10. Start the motor, and the rotation of the blades 201 can make the air flow. The air flow is sucked into the fan through the rotation of the blades 201. At this time, the air flow is in a rotating state, and then the rotating air flow can be changed to a horizontal flow through the rectification of the rear guide vane 301.

[0039] In summary, for this high-efficiency external rotor fan, under the combined action of the high-efficiency curved surface of the impeller and the rear guide vane of the air guide ring, first, the air flow with a rotating component is guided out of the impeller through the blades 201, and its circular motion is efficiently converted into axial motion. Then, the rear guide vane 301 can accurately guide the air flow flowing out of the impeller, convert the excess rotating component in the air flow into axial flow, effectively reduce the turbulence and energy loss of the air flow, thereby improving the ventilation effect, and improving the directivity of the air flow by adjusting the air flow direction, so as to achieve a large shooting range.

[0040] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

[0041] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency outer rotor fan, comprising an impeller module, a bracket module and a motor module, characterized in that: The motor module is detachably mounted in the bracket module, and the impeller module is fixedly connected to the motor module; The impeller module comprises an impeller hub (20) and blades (201); the impeller hub (20) is mounted on the motor module, and the blades (201) are fixedly mounted on the outer peripheral side of the impeller hub (20); The support module comprises an air guide ring (10), a guide vane hub (30) and a rear guide vane (301), wherein the guide vane hub (30) is arranged at the center of the air guide ring (10), the guide vane hub (30) is connected to the inner wall of the air guide ring (10) through the rear guide vane (301), and the motor module is mounted in the guide vane hub (30).

2. A high-efficiency outer rotor fan according to claim 1, characterized in that: At least two blades (201) are provided, and are circumferentially distributed on the outer peripheral side of the impeller hub (20); the blades (201) are provided as curved surfaces; the blades (201) gradually become larger from the inside to the outside; and the outer edges of the blades (201) are provided as flanges.

3. A high-efficiency outer rotor fan according to claim 2, characterized in that: A plurality of strip-shaped grooves (2011) are provided on a curved surface on one side of the blade (201), and a sawtooth tail (2012) is also provided on a side surface of the blade (201).

4. A high-efficiency outer rotor fan according to claim 1, characterized in that: The inner circles on both sides of the air guide ring (10) are respectively provided with an air inlet notch (101) and a diffuser (102), wherein the air inlet notch (101) is provided as an arc surface, and the diffuser (102) is provided as an inclined surface, and a reinforcing rib (103) is also fixedly mounted on the outer peripheral side of the air guide ring (10).

5. The high-efficiency outer rotor fan according to claim 1, characterized in that: A plurality of rear guide vanes (301) are provided, all of which are evenly distributed circumferentially on the outer peripheral side of the guide vane hub (30), and the rear guide vanes (301) are obliquely distributed in a clockwise direction.

6. A high-efficiency outer rotor fan according to claim 1, characterized in that: A diffusion rib (3011) is also provided at the connection between the rear guide vane (301) and the inner wall of the air guide ring (10).

7. A high-efficiency outer rotor fan according to claim 1, characterized in that: The side end surface of the guide vane hub (30) is also provided with at least two heat dissipation holes (302); the other side of the guide vane hub (30) is provided with a cavity, and a plurality of shock-absorbing strips are provided inside the cavity.

8. The high-efficiency outer rotor fan according to claim 1, characterized in that: The motor module comprises a motor rotor shell (40), a mounting flange (41) and a motor (42); the motor (42) is detachably mounted in the bracket module; the mounting flange (41) and the motor rotor shell (40) are used to mount the impeller module, and the three rotate synchronously with the motor rotor shell (40).

9. The high-efficiency outer rotor fan according to claim 1, characterized in that: A mesh cover (50) is also mounted on the side wall of the air guide ring (10); the mesh cover (50) is an annular mesh structure, and a plurality of mounting pins are arranged on its outer peripheral side; the mesh cover (50) is fixed to the bracket air guide ring (10) via the mounting pins; and the mesh gap of the mesh cover (50) is 9.5 mm.

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