Subway axial flow fan capable of preventing airflow resonance

Abstract

The utility model provides a subway axial flow fan capable of preventing airflow resonance, which relates to the technical field of axial flow fans and comprises a shell with an air cavity and blades arranged in the air cavity, and a circle of flow deflectors arranged at equal angles are arranged on the inner wall of the air cavity and positioned on the periphery of the blades. The middles of the flow deflectors are rotationally connected to the shell through rotating shafts, and the shell is provided with an angle adjusting mechanism capable of uniformly adjusting the angle of a circle of flow deflectors. According to the subway axial flow fan capable of preventing airflow resonance, when the axial flow fan has a surge phenomenon, the angle of the circle of flow deflectors can be adjusted through the angle adjusting mechanism, part of airflow entering the air cavity is blocked by the blades, and the blocked airflow enters the air cavity along with newly entering airflow in the tangential direction of the flow deflectors under the action of the flow deflectors; in other words, under the rectification effect of the flow deflectors, the airflow blocked by the blades does not violently conflict with the entering airflow any more, the surge influence of the airflow is effectively relieved, and the axial flow fan is prevented from being damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of axial flow fans, in particular to a subway axial flow fan capable of preventing airflow resonance. Background Art

[0002] The subway needs sufficient fresh air when it is running in the tunnel and when passengers are waiting on the platform. Therefore, ventilation equipment is needed in the tunnel. The subway axial flow fan can perfectly solve this problem. At the same time, in the event of an accidental fire, it can also discharge smoke out of the tunnel, minimizing casualties and losses.

[0003] The blades of subway axial fans play a role in inducing wind. Due to their shape design, they work stably under stable airflow. Since the subway will generate piston wind during the operation of the tunnel, the airflow direction and speed of the axial fan will change, that is, the working condition of the axial fan will change. The airflow blocked by the fan blades and the incoming airflow will lose their proper direction and collide violently, causing the axial fan to surge. Once the axial fan surges, it will vibrate violently, and in severe cases, it will cause damage to the axial fan, causing huge damage. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the utility model provides a subway axial flow fan for preventing airflow resonance, which solves the problems raised in the above-mentioned background technology.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the utility model is implemented through the following technical solutions: a subway axial flow fan for preventing airflow resonance, comprising a shell with an air cavity and blades arranged in the air cavity, a circle of guide vanes arranged at equal angles is arranged on the inner wall of the air cavity and located on the periphery of the blades, the middle of the guide vanes is rotatably connected to the shell through a rotating shaft, and the shell is provided with an angle adjustment mechanism that can uniformly adjust the angle of a circle of guide vanes.

[0008] Preferably, the angle adjustment mechanism includes a plurality of rotating plates, a plurality of connecting rods 1, a plurality of connecting rods 2, a frame and a motor, the top ends of the plurality of rotating plates are connected one by one to a plurality of rotating shafts, the bottom ends of two adjacent rotating plates are alternately hinged to each other through connecting rods 1 and 2, the frame is arranged on the outer ring of the shell, and the motor is arranged on the frame and connected to one of the rotating shafts.

[0009] Preferably, the inlet and outlet of the air cavity are both provided with a circle of guide vanes.

[0010] Preferably, the number of the guide vanes in one circle is at least 12.

[0011] Preferably, the connecting end of the rotating plate and the rotating shaft is clamped and connected by two clamping plates, and the two clamping plates are provided with fixing holes and fixed by a transverse locking bolt.

[0012] Preferably, the ends of the connecting rod 1 and the connecting rod 2 are sleeved on the hinge shaft on the rotating plate, and the inner diameter of the sleeve hole is larger than the outer diameter of the hinge shaft.

[0013] (III) Beneficial effects

[0014] The utility model provides a subway axial flow fan for preventing airflow resonance. It has the following beneficial effects:

[0015] 1. When the subway axial flow fan with anti-airflow resonance occurs surge, the angle of a circle of guide vanes can be adjusted through the angle adjustment mechanism, so that part of the airflow entering the wind cavity is blocked by the blades, and the blocked airflow enters the wind cavity along the tangent direction of the guide vanes with the newly entered airflow under the action of the guide vanes. That is, the airflow blocked by the blades will no longer have a violent conflict with the incoming airflow under the rectifying effect of the guide vanes, which effectively alleviates the impact of surge and prevents damage to the axial flow fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an axonometric drawing of the utility model;

[0017] Figure 2 This is a diagram of the angle adjustment state of the guide vane of the utility model;

[0018] Figure 3 It is a schematic diagram of the planar structure of the rotating plate of the utility model.

[0019] In the figure: 1 housing, 2 air chamber, 3 blades, 4 guide vanes, 5 rotating shaft, 6 rotating plate, 7 connecting rod 1, 8 connecting rod 2, 9 frame, 10 motor, 11 clamping plate, 12 fixing hole, 13 locking bolt. DETAILED DESCRIPTION

[0020] The utility model provides a subway axial flow fan for preventing airflow resonance, such as Figure 1-3 As shown, it includes a shell 1 with an air cavity 2 and blades 3 arranged in the air cavity 2. A motor for driving the shaft of the blades 3 is also arranged in the shell 1. The above is common knowledge of axial flow fans and will not be described in detail.

[0021] The innovation of the utility model is: Figure 1 As shown, a circle of guide vanes 4 arranged at equal angles is provided on the inner wall of the air cavity 2 and located outside the blades 3. The middle of the guide vanes 4 is rotatably connected to the housing 1 via a rotating shaft 5. Normally, a circle of guide vanes 4 forms a parallel ring.

[0022] like Figure 2 As shown, the housing 1 is provided with an angle adjustment mechanism that can uniformly adjust the angle of a circle of guide vanes 4. When the axial flow fan surges, the angle of a circle of guide vanes 4 can be adjusted through the angle adjustment mechanism, and part of the airflow entering the air cavity is blocked by the blades. Under the action of the guide vanes 4, the blocked airflow enters the air cavity along the tangent direction of the guide vanes 4 along with the newly entered airflow. That is, the airflow blocked by the blades 3 no longer conflicts violently with the incoming airflow under the rectifying action of the guide vanes 4, which effectively alleviates the impact of surge and prevents damage to the axial flow fan.

[0023] Specific as Figure 1 As shown, the angle adjustment mechanism includes a plurality of rotating plates 6, a plurality of connecting rods 1 7, a plurality of connecting rods 2 8, a frame 9 and a motor 10. The top ends of the plurality of rotating plates 6 are connected to the plurality of rotating shafts 5 one by one, and the bottom ends of two adjacent rotating plates 6 are alternately hinged to each other through connecting rods 1 7 and 2 8. Since there is an arc between each rotating plate 6, in order to ensure that the connecting rods can swing normally, the ends of connecting rods 1 7 and 2 8 are sleeved on the hinge shaft on the rotating plate 6 in a sleeved manner, and the inner diameter of the sleeve hole is larger than the outer diameter of the hinge shaft, so that the connecting rods 1 7 and 2 8 have a margin of movement when swinging. The frame 9 is arranged on the outer ring of the housing 1, and the motor 10 is arranged on the frame 9 and connected to one of the rotating shafts 5.

[0024] like Figure 2 When the angle adjustment mechanism is in operation, the motor 10 drives one of the rotating plates 6 to rotate in the deflection direction of the blade 3, and the rotating plate 6 synchronously links all the rotating plates 6 to rotate through the connecting rod, thereby driving all the guide vanes 4 to flip.

[0025] The inlet and outlet of the air cavity 2 are both provided with a circle of guide vanes 4. When adjusting, the guide vanes 4 of the inlet and outlet are adjusted at the same time to make the inlet and outlet flow channel of the air cavity 2 smooth.

[0026] The number of guide vanes 4 in one circle is at least 12. As a preferred solution, a total of 24 guide vanes 4 are provided in this embodiment.

[0027] like Figure 3 As shown, the connecting ends of the rotating plate 6 and the rotating shaft 5 are clamped and connected by two clamping plates 11. The two clamping plates 11 are provided with fixing holes 12 and fixed by a transverse locking bolt 13. When the guide vane 4 needs to be repaired or adjusted separately, the locking bolt 13 can be unscrewed to separate the rotating shaft 5 from the rotating plate 6, effectively preventing the guide vane 4 from being linked to other guide vanes 4 when rotating.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A subway axial flow fan for preventing airflow resonance, comprising a housing (1) with an air cavity (2) and blades (3) arranged in the air cavity (2), characterized in that: A circle of guide vanes (4) arranged at equal angles is provided on the inner wall of the wind cavity (2) and located outside the blades (3); the middle of the guide vanes (4) is rotatably connected to the housing (1) via a rotating shaft (5); and the housing (1) is provided with an angle adjustment mechanism capable of uniformly adjusting the angles of a circle of guide vanes (4).

2. The subway axial flow fan for preventing airflow resonance according to claim 1, characterized in that: The angle adjustment mechanism comprises a plurality of rotating plates (6), a plurality of connecting rods 1 (7), a plurality of connecting rods 2 (8), a frame (9) and a motor (10); the top ends of the plurality of rotating plates (6) are connected one by one to the plurality of rotating shafts (5); the bottom ends of two adjacent rotating plates (6) are alternately hinged to each other through connecting rods 1 (7) and connecting rods 2 (8); the frame (9) is arranged on the outer ring of the housing (1); and the motor (10) is arranged on the frame (9) and connected to one of the rotating shafts (5).

3. The subway axial flow fan for preventing airflow resonance according to claim 2, characterized in that: The inlet and outlet of the air cavity (2) are both provided with a circle of guide vanes (4).

4. The subway axial flow fan for preventing airflow resonance according to claim 2, characterized in that: The connecting ends of the rotating plate (6) and the rotating shaft (5) are clamped and connected via two clamping plates (11). The two clamping plates (11) are provided with fixing holes (12) and are fixed via a transverse locking bolt (13).

5. The subway axial flow fan for preventing airflow resonance according to claim 2, characterized in that: The ends of the connecting rod 1 (7) and the connecting rod 2 (8) are sleeved on the hinge shaft on the rotating plate (6), and the inner diameter of the sleeve hole is larger than the outer diameter of the hinge shaft.

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