A rear guide vane with a cylindrical body for an axial flow fan

Abstract

This invention provides a rear-mounted guide vane with a cylindrical body for an axial flow fan, belonging to the field of ventilation equipment technology. It solves the problems of insufficient airflow or low static pressure efficiency in the high static pressure zone in existing technologies. This invention includes a guide vane body, guide vane blades, and a central hub. The two sides of the guide vane body are the outlet side and the inlet side, respectively, with the diameter of the outlet side being larger than that of the inlet side. The guide vane body is integrally formed and has a conical ring shape. The inner wall of the guide vane body forms a first mounting surface, which is a conical ring structure. The central hub is ring-shaped, and several mounting protrusions are formed on one side of the central hub. The outer surface of the central hub and the mounting protrusions forms a second mounting surface. The guide vane blades are numerous and arranged in a circumferential array, fixed between the first and second mounting surfaces. The cross-section of the guide vane blades is a thin plate structure of uniform thickness with an arc shape. This invention has the advantages of reducing turbulence, increasing airflow in the high static pressure zone, high static pressure efficiency, and increased range.

Description

Technical Field

[0001] This utility model belongs to the field of ventilation equipment technology, and relates to a rear guide vane with a cylindrical body for an axial flow fan. Background Technology

[0002] Axial flow fans, widely used in industrial and civil ventilation systems, use the rotation of an impeller to direct airflow into and out of the fan along the axial direction. They are characterized by large flow rate, low air pressure, and simple structure.

[0003] Chinese patent publication number CN214330992U discloses a rear guide vane and an axial flow fan using the rear guide vane, comprising multiple blades arranged circumferentially, with an impeller at the blade root. Two adjacent blades are joined together by the impeller to form a rear guide vane. One side of the impeller is provided with a dovetail protrusion, and the other side of the impeller is provided with a dovetail groove adapted to the dovetail protrusion. Between two adjacent blades, the dovetail protrusion of one blade is inserted into the dovetail groove of the other blade, and the dovetail protrusion and the dovetail groove cooperate. The dovetail groove includes a first sidewall, a bottom wall, and a second sidewall. One side of the first sidewall and the second sidewall along the width direction is connected to the other side of the impeller along the width direction, and the other side of the first sidewall and the second sidewall along the width direction are respectively connected to the two sides of the bottom wall along the width direction.

[0004] The patent provides a rear guide vane and an axial flow fan using the rear guide vane. The presence of the dovetail structure changes the airflow pattern on the blade surface. In the edge area of ​​the dovetail protrusion and groove, the airflow is easily separated, thus forming vortices. The vortices consume the kinetic energy of the airflow and cannot effectively convert it into static pressure energy, resulting in a decrease in static pressure boosting efficiency. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a rear guide vane with a cylindrical body for an axial flow fan.

[0006] The objective of this utility model can be achieved through the following technical solution: A rear-mounted guide vane with a cylindrical body for an axial flow fan, comprising a guide vane body, guide vane blades, and a central hub. The two sides of the guide vane body are respectively the outlet side and the inlet side, with the diameter of the outlet side being larger than that of the inlet side. The fan body is integrally formed and has a conical ring shape. The inner wall of the guide vane body forms a first mounting surface, which is a conical ring structure. The central hub is ring-shaped, and a plurality of mounting protrusions are formed on one side of the central hub. The outer surface of the central hub and the mounting protrusions forms a second mounting surface. The number of guide vane blades is plurality, and the guide vane blades are arranged in a circumferential array and fixed between the first mounting surface and the second mounting surface. The cross-section of the guide vane blades is a thin plate structure of uniform thickness with an arc. The diameter of the guide vane body is D, and the arc of the guide vane blades is r, which is 0.1D to 0.2D.

[0007] In the aforementioned type of axial flow fan with a cylindrical rear guide vane, the number of guide vane blades is 9 to 13.

[0008] In the aforementioned rear guide vane with a cylindrical body for an axial flow fan, the chord length of the guide vane blade is L and is between 0.05D and 0.15D.

[0009] In the aforementioned rear-mounted guide vane with a cylindrical body for an axial flow fan, the angle difference between the guide vane blade and the first mounting surface is 15° to 26°, and the angle difference between the guide vane blade and the second mounting surface is 15° to 26°.

[0010] In the aforementioned rear-mounted guide vane with a cylindrical body for an axial flow fan, the taper of the guide vane body and the first mounting surface is 5° to 20°.

[0011] In the aforementioned rear-mounted guide vane with a cylindrical body for an axial flow fan, a first fixing ring and a second fixing ring are formed on the air outlet side and air inlet side of the guide vane body, and a plurality of first fixing holes and second fixing holes are respectively provided in the first fixing ring and the second fixing ring.

[0012] In the aforementioned rear guide vane with a cylindrical body for an axial flow fan, a third fixing ring is formed on one side of the central hub, and the third fixing ring has several third fixing holes.

[0013] Compared with existing technologies, the rear guide vane with cylindrical body provided by this utility model for an axial flow fan has the following beneficial effects: 1. The main body of the guide vane is an integrally formed conical ring, and the guide vane blades are distributed in a circumferential array with a cross-section of a thin plate of uniform thickness and arc. This regular and smooth structure makes the airflow smoother and reduces airflow turbulence caused by structural abrupt changes. The conical ring structure of the guide vane also helps the airflow maintain a good flow pattern, reduces diffusion, and thus increases the airflow range; 2. The conical ring guide vane body, combined with the number and curvature of the guide vane blades, optimizes the airflow channel, allowing more airflow to converge in the high static pressure area. The guide vane's uniform thickness and arc structure provides good airflow guidance and pressurization effects, significantly increasing the airflow that can pass through the high static pressure area; 3. The aerodynamic parameters of the guide vane blades are precisely designed, which can efficiently convert airflow kinetic energy into static pressure energy, reduce energy loss, and thus improve static pressure efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] In the figure: 1. Guide impeller body; 11. Exit side; 12. Inlet side; 13. First mounting surface; 14. First fixing ring; 141. First fixing hole; 15. Second fixing ring; 151. Second fixing hole; 2. Guide impeller blade; 3. Central hub; 31. Mounting protrusion; 32. Second mounting surface; 33. Third fixing ring; 331. Third fixing hole. Detailed Implementation

[0016] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0017] like Figure 1 As shown, this embodiment includes a guide impeller body 1, guide blades 2, and a central hub 3. The two sides of the guide impeller body 1 are an outlet side 11 and an inlet side 12, respectively, and the diameter of the outlet side 11 is larger than that of the inlet side 12. This structure conforms to the airflow characteristics and can effectively reduce wind resistance. The guide impeller body 1 is made by an integral molding process and is in the shape of a conical ring, which improves the structural stability. The inner wall of the guide impeller body 1 forms a first mounting surface 13, which is a conical ring structure, providing a suitable curved surface foundation for the installation of the guide blades 2.

[0018] like Figure 1 As shown, the central hub 3 is ring-shaped, and several mounting protrusions 31 are formed on one side of the central hub 3. The outer surfaces of the central hub 3 and the mounting protrusions 31 together constitute the second mounting surface 32. The mounting protrusions 31 enlarge the area of ​​the second mounting surface 32. There are several guide vanes 2 distributed in a circular array. The two ends of the guide vanes 2 are fixed between the first mounting surface 13 and the second mounting surface 32, respectively. The contact point between one side of the guide vane 2 and the second mounting surface 32 is located on the second mounting surface 32 formed by the mounting protrusions 31. This circular array layout can make the airflow evenly distributed and improve the working efficiency of the fan. The cross-section of the guide vane 2 is a thin plate structure with a circular arc and equal thickness, which not only ensures the structural strength of the blade, but also reduces the overall weight. Moreover, the guide vane 2 with a circular arc cross-section structure can better guide the airflow direction.

[0019] To elaborate further, such as Figure 1As shown, the number of guide vane blades 2 is preferably 9 to 13. Within this range, the guiding effect of the guide vane on the airflow can be ensured, and the wind resistance will not be increased due to too many blades. D is the diameter of the guide vane body 1, and the chord length of the guide vane blade 2 is L, and L is 0.05D to 0.15D. The reasonable setting of the chord length can ensure that the blades can avoid interference with other components while ensuring the effective air guiding area. The angle difference between the guide vane blade 2 and the first mounting surface 13 is 15° to 26°, and the angle difference between the guide vane blade 2 and the second mounting surface 32 is also 15° to 26°. This angle range can enable the airflow to achieve smooth turning under the guidance of the guide vane blade 2 and reduce energy loss.

[0020] To elaborate further, such as Figure 1 As shown, the taper of the guide impeller body 1 and the first mounting surface 13 is 5° to 20°. The appropriate taper design can match the conical ring structure of the impeller body 1, making the airflow inside the guide impeller body 1 smoother.

[0021] To elaborate further, such as Figure 1 As shown, the air outlet side 11 and air inlet side 12 of the guide impeller body 1 are respectively formed with a first fixing ring 14 and a second fixing ring 15. The first fixing ring 14 and the second fixing ring 15 are respectively provided with a plurality of first fixing holes 141 and second fixing holes 151. The guide impeller body 1 can be stably installed in the corresponding position of the fan through the first fixing holes 141 and the second fixing holes 151. A third fixing ring 33 is formed on one side of the central hub 3. The third fixing ring 33 is provided with a plurality of third fixing holes 331 for connecting and fixing the central hub 3 with other components of the fan, so as to facilitate the overall assembly and disassembly.

[0022] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0023] Although this document uses a variety of terms, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

Claims

1. A rear-mounted guide vane with a cylindrical body for an axial flow fan, comprising a rotor body (1), guide vane blades (2), and a central hub (3), characterized in that: The wind turbine body (1) has an exhaust side (11) and an intake side (12) on both sides, with the diameter of the exhaust side (11) being larger than that of the intake side (12). The wind turbine body (1) is integrally formed and has a conical ring shape. The inner wall of the wind turbine body (1) forms a first mounting surface (13), which is a cone-shaped ring structure. The central hub (3) is ring-shaped, and a number of mounting protrusions (31) are formed on one side of the central hub (3). The outer surface of the central hub (3) and the mounting protrusions (31) forms a second mounting surface (32). The number of guide vanes (2) is several, and the guide vanes (2) are arranged in a circular array and fixed between the first mounting surface (13) and the second mounting surface (32). The cross section of the guide vanes (2) is a thin plate structure with a circular arc and equal thickness. The diameter of the wind turbine body (1) is D, and the arc of the guide vanes (2) is r, which is 0.1D to 0.2D.

2. The rear guide vane with cylindrical body for an axial flow fan according to claim 1, characterized in that: The number of guide vane blades (2) is 9 to 13.

3. The rear guide vane with a cylindrical body for an axial flow fan according to claim 1, characterized in that: The chord length of the guide vane (2) is L and is between 0.05D and 0.15D.

4. The rear guide vane with a cylindrical body for an axial flow fan according to claim 1, characterized in that: The angle difference between the guide vane (2) and the first mounting surface (13) is 15° to 26°, and the angle difference between the guide vane (2) and the second mounting surface (32) is 15° to 26°.

5. The rear guide vane with a cylindrical body for an axial flow fan according to claim 1, characterized in that: The taper of the wind turbine body (1) and the first mounting surface (13) is 5° to 20°.

6. The rear guide vane with a cylindrical body for an axial flow fan according to claim 1, characterized in that: The air outlet side (11) and air inlet side (12) of the wind turbine body (1) are provided with a first fixing ring (14) and a second fixing ring (15), and a plurality of first fixing holes (141) and second fixing holes (151) are respectively provided in the first fixing ring (14) and the second fixing ring (15).

7. The rear guide vane with a cylindrical body for an axial flow fan according to claim 1, characterized in that: A third fixing ring (33) is formed on one side of the central hub (3), and a plurality of third fixing holes (331) are provided in the third fixing ring (33).

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