Flow guide device with multiple sections of guide vanes for axial flow fan

Abstract

The flow guide device comprises an outer ring, a plurality of flow guide blades and an inner ring, the outer ring and the inner ring are fixedly connected through the flow guide blades, and a plurality of flow guide rings are arranged between the outer ring and the inner ring in the radial direction of the flow guide blades. A flange plate is arranged on the outlet side of the outer ring of the flow guiding device, a plurality of positioning holes are evenly formed in the flange plate, and the flow guiding device is fixed to a supporting frame connected with a motor through the flange plate on the outer ring and the positioning holes. The flow guide device is supported by the outer ring instead of the inner ring, so that the overall strength of the flow guide device is improved, the stability of the fan is improved, and the service life of the fan is prolonged. Due to the design of the multiple sections of flow guide rings, the flexibility of the flow guide device capable of meeting various application requirements is improved, and meanwhile the design and manufacturing cost is effectively reduced. Guide vanes between different guide rings of the guide device are designed in sections, so that the efficiency and range of the ventilator are effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ventilator equipment, in particular to a flow guide device with multiple guide vanes for an axial flow ventilator. Background Art

[0002] In the field of ventilation equipment technology, axial flow fans are a common type of equipment. Their main function is to generate airflow through rotating blades, thereby achieving air transportation and energy conversion. In this type of equipment, the guide device plays a key role. It can guide the flow direction of the airflow, ensure stable relative flow in the impeller, and eliminate the rotational motion of the fluid at the impeller outlet, so that the fluid can be more evenly transported to the outlet, reducing energy loss and improving ventilation efficiency. In the field of fluid machinery technology, the design and optimization of the guide device is an important research topic, the purpose of which is to improve the flow state of the fluid and improve the operating efficiency of the equipment. In the field of mechanical structure design, the design of the guide device needs to consider factors such as its strength, stability and manufacturability.

[0003] The existing flow guide device usually includes an outer ring, several guide blades and an inner ring. The application scenario of this flow guide device is single. In order to meet different application scenarios, the flow guide device needs to be redesigned and developed. The design and manufacturing costs are greatly increased. At the same time, the flow guide devices currently used in the market are mostly flanges set on their inner rings, and the flanges have evenly distributed positioning holes. The flow guide device is connected to the motor through the positioning holes on the inner ring flange. Due to the size and structural limitations of the inner ring, it is found in actual applications that after a period of operation, different numbers of cracks appear at different positions of the flow guide device, which in turn affects the strength of the flow guide device and the service life of the axial flow fan. In the existing flow guide device design, a continuous guide blade design is adopted from the blade root to the blade top. The consistency of the guide blade gradually decreases from the blade root to the blade top, resulting in the gradual weakening of the control ability of the guide blade on the flow, and often flow separation occurs near the blade top, affecting the performance of the fan. Through the simulation of the fan flow field and the visualization test test, it is found that the pressure difference between the pressure surface and the suction surface of the blade is usually the largest near the top area of ​​the blade, which has a key influence on the blade's ability to do work. Therefore, the reasonable design of the guide vane tip accessories is very important to the fan performance. Utility Model Content

[0004] In order to solve the above technical problems, the utility model designs a flow guide device with multiple guide vanes for an axial flow fan.

[0005] The utility model adopts the following technical solutions:

[0006] A guide device with multiple guide vanes for an axial flow fan comprises an outer ring, a plurality of guide vanes and an inner ring. The outer ring and the inner ring are fixedly connected by the plurality of guide vanes. A plurality of guide rings are arranged between the outer ring and the inner ring along the radial direction of the guide vanes. A flange is arranged on the outlet side of the outer ring of the guide device. A plurality of positioning holes are evenly arranged on the flange. The guide device is fixed to a support frame connected to a motor through the flange and the positioning holes on the outer ring.

[0007] Preferably, the guide rings of the guide device can be flexibly combined according to the requirements of different applications for the outlet flow field. The switching of different guide rings can be achieved through a mold.

[0008] Preferably, the outer ring of the guide device includes a trumpet-shaped inlet section, a straight transition section and a diffusion section, and the inlet diameter Φ4i of the i-th guide ring in the multi-section guide ring is related to the inlet diameter Φ1 of the diffusion section and the inlet diameter Φ3 of the inner ring, satisfying Φ3<Φ4i<Φ1, i≥1.

[0009] Preferably, the difference between the inlet diameter of the i+1th guide ring and the inlet diameter of the i-th guide ring in the multi-segment guide ring is Φ4(i+1)-Φ4i=k(Φ1-Φ3), and the value of k ranges from 0.05 to 0.5.

[0010] Preferably, the angle relationship between the outer ring, inner ring and different guide rings of the guide device and the center line is: θ1≥θ4(i+1)≥θ4i≥θ3, so as to ensure that the flow area between different guide rings of the guide device gradually increases from the inlet to the outlet, thereby achieving the function of reducing the liquid flow velocity and converting the fluid velocity energy into pressure energy. Among them: i+1 represents the outer ring guide ring, and i represents the inner guide ring.

[0011] Preferably, the length of the guide ring is related to the length of the guide vane, the axial distance between the guide ring inlet at different radial positions and the leading edge of the guide vane at that position is greater than or equal to 5 mm, and the axial distance between the guide ring outlet and the trailing edge of the guide vane at that position is greater than or equal to 5 mm.

[0012] Preferably, the outer ring diffusion angle θ1 of the guide device is in the range of 5 to 30°

[0013] Preferably, the top of the guide blade of the guide device is fixedly connected to the outer ring, and the root of the guide blade is fixedly connected to the inner ring.

[0014] Preferably, the guide blades between different guide rings of the guide device can be distributed continuously or arranged circumferentially in an interlaced manner. The blade shape, number and arrangement of the guide blades between different guide rings vary according to the application scenario.

[0015] Preferably, the number of guide blades connected to the inner ring of the guide device N3≥5, and the number of guide blades connected to the outer ring N1≥10.

[0016] Preferably, the flow guide device is integrally formed by injection molding.

[0017] Preferably, the guide blade profile of the guide device is a spatial curve, and the specific profile design is determined according to the application conditions of the flow field and takes into account the structural dimensions of the guide device and various components of the fan.

[0018] The beneficial effects of the utility model are as follows: (1) The existing guide device mostly uses an inner ring as a supporting structure. In actual applications, it is found that after a period of operation, different numbers of cracks appear in different positions of the guide device, which in turn affects the strength of the guide device and the service life of the axial flow fan. In this technical solution, the guide device is supported by an outer ring instead of an inner ring, which can improve the overall strength of the guide device. This design can not only improve the stability of the fan, but also improve its service life. (2) The existing guide device usually includes an outer ring, a plurality of guide blades and an inner ring. The application scenario is single, and the guide device needs to be redesigned and developed for different application scenarios. In this technical solution, the guide device has multiple sections of guide rings between the inner ring and the outer ring, and the multiple sections of guide rings can be flexibly combined according to the requirements of different applications for outlet flow characteristics, and the switching of different guide rings can be achieved through molds. The flexibility of the guide device to meet various application requirements is improved, while effectively reducing the design and manufacturing costs. (3) The existing guide blades of the guide device are continuously distributed from the root to the top of the blade. The density of the guide blades gradually decreases from the root to the top of the blade, and the flow control ability of the blades gradually weakens, affecting the performance of the fan. The guide blades between different guide rings of the guide device of this technical solution are designed in sections. The profile design, quantity and circumferential arrangement of the guide blades between different guide rings can be adjusted according to actual needs, effectively improving the efficiency and range of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a three-dimensional structural diagram of the flow guide device of the utility model;

[0020] Figure 2 This is a rear view of the flow guide device of the utility model;

[0021] Figure 3 It is a cross-sectional view of the flow guide device of the utility model;

[0022] Figure 4 This is a front view of the flow guide device of the utility model;

[0023] Figure 5 It is a three-dimensional structural diagram of the combination of the inner ring of the flow guide device and the inner flow guide ring of the utility model;

[0024] Figure 6 It is a three-dimensional structural diagram of the combination of the inner ring and the outer guide ring of the guide device of the utility model;

[0025] Figure 7This is a flow field characteristic diagram of different guide ring combinations of the utility model;

[0026] 1. Outer ring, 2. Guide vane, 3. Inner ring, 4. Guide ring, 41. Inner guide ring, 42. Outer guide ring, 11. Trumpet-shaped inlet section, 12. Straight transition section, 13. Diffusion section, 14. Flange, 15. Positioning hole, 21. Leading edge of guide vane, 22. Trailing edge of guide vane. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0028] Example: Figure 1-Figure 2 As shown, a guide device with multiple guide vanes for an axial flow fan comprises an outer ring 1, a plurality of guide vanes 2, an inner ring 3, and a plurality of guide rings 4 arranged radially along the guide vanes. A flange 14 is arranged at the outlet side of the outer ring of the guide device, and a plurality of positioning holes 12 are evenly arranged on the flange. The guide device is fixed to a support frame connected to a motor through the outer ring flange and the positioning holes.

[0029] like Figure 3 As shown, the outer ring of the guide device includes a trumpet-shaped inlet section 11, a straight transition section 12 and a diffuser section 13. The diffuser section has a diffusion angle of θ1 = 13°, an inlet diameter Φ1 = 960 mm, an inner ring angle θ3 = 0°, and an inlet diameter

[0030] Φ3=300mm, number of guide blades N=12.

[0031] like Figure 4 As shown, the number of guide rings is 2, wherein the inner guide ring 41 has a length L41 = 76 mm, an angle θ41 = 10°, and an inlet diameter Φ41 = 526 mm. The outer guide ring 42 has a length L42 = 76 mm, an angle θ42 = 10°, and an inlet diameter Φ41 = 526 mm.

[0032] Φ42=795mm. Different guide rings can be switched through the mold. The design and manufacture of the mold can be carried out according to actual needs to ensure the accuracy and stability of the guide ring. The material of the mold can be selected from high-strength and wear-resistant materials.

[0033] like Figure 5 As shown, it is a three-dimensional structural diagram of the inner ring of the flow guide device and the inner flow guide ring of the utility model. Figure 6 As shown, it is a three-dimensional structure diagram of the combination of the inner ring and the outer guide ring of the guide device of the utility model, such as Figure 7 As shown, it is a flow field characteristic curve diagram of a fan using the guide device after the inner ring and different guide rings are combined. Curve A is the combination of the inner ring and the outer guide ring 41, and curve B is the combination of the inner ring and the outer guide ring 42.

[0034] The above-described embodiment is only a preferred solution of the present invention and does not limit the present invention in any form. There are other variations and modifications without exceeding the technical solution described in the claims.

Claims

1. A guide device with multiple guide vanes for an axial flow fan, comprising an outer ring, a plurality of guide vanes and an inner ring, wherein the outer ring and the inner ring are fixedly connected by the plurality of guide vanes, wherein: A plurality of guide rings are arranged between the outer ring and the inner ring along the radial direction of the guide blades. A flange is arranged on the outlet side of the outer ring of the guide device. A plurality of positioning holes are evenly arranged on the flange. The guide device is fixed to the support frame connected to the motor through the flange and the positioning holes on the outer ring.

2. A flow guide device with multiple guide vanes for an axial flow fan according to claim 1, characterized in that: The outer ring of the guide device includes a trumpet-shaped inlet section, a straight transition section and a diffusion section. The inlet diameter Φ4i of the i-th guide ring in the multi-section guide ring is related to the inlet diameter Φ1 of the diffusion section and the inlet diameter Φ3 of the inner ring, satisfying Φ3<Φ4i<Φ1, i≥1.

3. The flow guide device with multiple guide vanes for an axial flow fan according to claim 1, characterized in that: The difference between the inlet diameter of the i+1th guide ring and the inlet diameter of the i-th guide ring in the multi-segment guide ring is Φ4(i+1)-Φ4i=k(Φ1-Φ3), and the value range of k is 0.05~0.

5.

4. The flow guide device with multiple guide vanes for an axial flow fan according to claim 1, characterized in that: The length of the guide ring is related to the length of the guide vane. The axial distance between the guide ring inlet at different radial positions and the leading edge of the guide vane at that position is greater than or equal to 5 mm, and the axial distance between the guide ring outlet and the trailing edge of the guide vane at that position is greater than or equal to 5 mm.

5. The flow guide device with multiple guide vanes for an axial flow fan according to claim 1, characterized in that: The angle relationship between the outer ring, inner ring and different guide rings of the guide device and the center line is: θ1≥θ4(i+1)≥θ4i≥θ3, where: i+1 represents the outer ring guide ring, and i represents the inner guide ring.

6. The flow guide device with multiple guide vanes for an axial flow fan according to claim 1, characterized in that: The outer ring diffusion angle θ1 of the guide device is in the range of 5 to 30 degrees.

7. The flow guide device with multiple guide vanes for an axial flow fan according to claim 1, characterized in that: The top of the guide blade of the guide device is fixedly connected to the outer ring, and the root of the guide blade is fixedly connected to the inner ring.

8. The flow guide device with multiple guide vanes for an axial flow fan according to claim 1, characterized in that: The guide blades between different guide rings of the guide device can be distributed continuously or arranged circumferentially in a staggered manner.

9. The flow guide device with multiple guide vanes for an axial flow fan according to claim 1, characterized in that: The number of guide blades connected to the inner ring of the guide device is N3≥5, and the number of guide blades connected to the outer ring is N1≥10.

10. The flow guide device with multiple guide vanes for an axial flow fan according to claim 1, characterized in that: The flow guide device is integrally formed by injection molding.

Images