Assembly type axial flow fan

Abstract

The utility model provides an assembly type axial flow fan, which relates to the technical field of axial flow fans, and comprises a shell, a blade is arranged at the axis of an air cavity of the shell, a detachable anti-resonance flow guide device is arranged on the inner wall of an inlet and an outlet of the air cavity, and the anti-resonance flow guide device comprises a plurality of groups of flow deflectors, a rotating shaft and an adjusting screw rod, the adjusting screw rod, the rotating shaft and the flow deflectors are sequentially connected, a screw hole allowing the rotating shaft to be inserted is formed in the shell in the radial direction, the adjusting screw rod can be in threaded connection with the screw hole, the flow deflectors are distributed around the center of the air cavity at equal angles to form a ring, and the flow deflectors are detachably connected with the rotating shaft. According to the assembly type axial flow fan, all the flow deflectors can be synchronously adjusted to proper angles through the adjusting screw rods according to the rated power of the fan. When the axial flow fan surges, part of airflow entering the air cavity is blocked by the blades, 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, that is, the airflow blocked by the blades does not violently conflict with the entering airflow under the rectification action of the flow deflectors, and therefore the airflow blocking effect is improved. The influence of surge 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 an assembled axial flow fan. Background Technique

[0002] During the operation of the subway in the tunnel and the waiting of passengers on the platform, sufficient fresh air is required. Therefore, ventilation equipment is needed in the tunnel, and the subway axial flow fan can perfectly solve this problem.

[0003] The blades of the subway axial flow fan play a role in guiding air. Due to the design of its shape, it works stably under a stable air flow. Since piston wind is generated during the operation of the subway in the tunnel, the direction and speed of the air flow of the axial flow fan change, that is, the working condition of the axial flow fan changes. The air flow blocked back by the fan blades and the incoming air flow both lose their due directions and collide violently, resulting in the occurrence of a surge phenomenon in the axial flow fan. Once the axial flow fan has a surge phenomenon, it will generate violent vibrations, and in severe cases, it will cause damage to the axial flow fan, bringing huge losses.

[0004] However, most of the anti-resonance flow guiding devices installed on the axial flow fans on the market at present are flow guiding strips arranged on the inner wall of the air cavity. However, since the installation of the flow guiding strips is fixed and integrally formed with the casing, the angle of the flow guiding strips cannot be adjusted according to the intensity of resonance and the load of the fan. At the same time, the flow guiding strips cannot be replaced when they are worn. Content of the Utility Model

[0005] (1) Technical Problems to be Solved

[0006] In view of the deficiencies of the prior art, the utility model provides an assembled axial flow fan, which solves the problems put forward in the above background technique.

[0007] (2) Technical Solutions

[0008] To achieve the above purposes, the utility model is realized through the following technical solutions: an assembled axial flow fan, including a casing, a blade is arranged at the axis center of the air cavity of the casing, a detachable anti-resonance flow guiding device is arranged on the inner walls of the inlet and outlet of the air cavity, the anti-resonance flow guiding device includes several groups of flow guiding vanes, a rotating shaft, and an adjusting screw. The adjusting screw, the rotating shaft, and the flow guiding vanes are connected in sequence. A screw hole for inserting the rotating shaft is radially opened on the casing, the adjusting screw can be threadedly connected with the screw hole, several flow guiding vanes are equally angularly distributed around the center of the air cavity to form a ring, and the flow guiding vanes are detachably connected to the rotating shaft.

[0009] Preferably, a fixing groove for inserting the flow guiding vane is opened at the bottom end of the rotating shaft, and fixing bolts corresponding to the flow guiding vanes are threadedly connected to the rotating shaft.

[0010] Preferably, a screw sleeve is threadedly sleeved on the adjusting screw.

[0011] Preferably, a plurality of angle grooves are axially formed on the outer wall of the adjusting screw, and arrows corresponding to the centers of the screw holes one by one are circumferentially arranged on the outer wall of the housing.

[0012] Preferably, a mark for identifying the angle is arranged in each angle groove.

[0013] (III) Beneficial effects

[0014] The utility model provides an assembled axial flow fan, which has the following beneficial effects:

[0015] 1. During the use of the assembled axial flow fan, all the guide vanes can be synchronously adjusted to appropriate angles through the adjusting screw according to the rated power of the fan. When the axial flow fan surges, part of the air flow entering the air chamber is blocked back by the blades. The blocked-back air flow enters the air chamber along the tangential direction of the guide vanes under the action of the guide vanes together with the newly entering air flow. That is, the blocked-back air flow under the rectifying action of the guide vanes no longer collides violently with the entering air flow, effectively alleviating the influence of surging and preventing the axial flow fan from being damaged.

[0016] 2. When the assembled axial flow fan needs to be disassembled, first remove each guide vane from the rotating shaft, and then screw out each adjusting screw from the screw hole, which is convenient for the installation, disassembly and maintenance of the whole axial flow fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is an axonometric view of the utility model;

[0018] Figure 2 is a partial schematic view outside the housing of the utility model;

[0019] Figure 3 is a schematic side sectional view of the utility model.

[0020] In the figure: 1 housing, 2 blade, 3 guide vane, 4 rotating shaft, 5 fixing groove, 6 fixing bolt, 7 adjusting screw, 8 screw hole, 9 screw sleeve, 10 angle groove, 11 mark, 12 arrow, 13 air chamber. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] An embodiment of the utility model provides an assembled axial flow fan, as Figures 1 - 3 shown, which includes a housing 1. A blade 2 is arranged at the axis center of the air chamber 13 of the housing 1. A motor for driving the shaft of the blade 2 is also arranged in the housing 1. The above are the common knowledge of the axial flow fan and will not be elaborated specifically.

[0022] Detachable anti-resonance flow guiding devices are provided on the inner walls of the inlet and outlet of the air cavity 13. The anti-resonance flow guiding devices include several groups of flow guiding vanes 3, a rotating shaft 4, and an adjusting screw 7. In this embodiment, a total of 24 groups are provided. The adjusting screw 7, the rotating shaft 4, and the flow guiding vanes 3 are connected in sequence, and the flow guiding vanes 3 are detachably connected to the rotating shaft 4. Specifically, a fixing groove 5 for inserting the flow guiding vanes 3 is provided at the bottom end of the rotating shaft 4. A fixing perforation is provided at the center of the symmetry line of the flow guiding vanes 3, and a fixing bolt 6 corresponding to the fixing perforation of the flow guiding vanes 3 is threadedly connected to the rotating shaft 4. This facilitates the installation and disassembly of the flow guiding vanes 3.

[0023] A threaded hole 8 for inserting the rotating shaft 4 is radially provided on the housing 1. The diameter of the rotating shaft 4 is smaller than the diameter of the threaded hole 8. The rotating shaft 4 can directly pass through the threaded hole 8, and the adjusting screw 7 can be threadedly connected to the threaded hole 8. The angle orientation of the flow guiding vanes 3 and the connection relationship with the housing 1 can be adjusted through the adjusting screw 7. The 24 flow guiding vanes 3 are equally angularly distributed around the center of the air cavity 13. Under normal conditions, a circle of flow guiding vanes 3 forms a parallel ring. During use, all the flow guiding vanes 3 can be synchronously adjusted to a suitable angle through the adjusting screw 7 according to the rated power of the fan. When the axial flow fan has a surging phenomenon, part of the air flow entering the air cavity is blocked back by the blades. The blocked-back air flow enters the air cavity along the tangential direction of the flow guiding vanes 3 under the action of the flow guiding vanes 3 along with the newly entering air flow. That is, the air flow blocked back by the blades 2, under the rectifying action of the flow guiding vanes 3, no longer has a violent conflict with the entering air flow, effectively alleviating the impact of surging and preventing damage to the axial flow fan.

[0024] To prevent loosening between the adjusting screw 7 and the threaded hole 8, a threaded sleeve 9 is sleeved on the adjusting screw 7. After the adjusting screw 7 is adjusted, the threaded sleeve 9 is screwed to be stuck on the housing 1, which can effectively prevent the adjusting screw 7 from rotating.

[0025] To make the angle adjustment of each flow guiding vane 3 have a higher consistency, at least 6 angle grooves 10 are axially provided on the outer wall of the adjusting screw 7. The several angle grooves 10 are equally angularly distributed around the center of the adjusting screw 7. Each angle groove 10 represents an angle value. An arrow 12 corresponding to the center of the threaded hole 8 is circumferentially provided on the outer wall of the housing 1.

[0026] To distinguish the degrees of each angle groove 10, a mark 11 for identifying the angle is provided in each angle groove 10. Specific angle values can be used as the mark 11.

[0027] During adjustment, the angle grooves 10 with the same mark 11 on all the adjusting screws 7 are adjusted to align with the arrow 12, so that the angle deflection of all the flow guiding vanes 3 is relatively consistent.

[0028] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. An assembled axial flow fan, comprising a housing (1), wherein a blade (2) is arranged at the axis of a wind cavity (13) of the housing (1), and characterized in that: A detachable anti-resonance guide device is provided on the inner wall of the inlet and outlet of the wind cavity (13), the anti-resonance guide device comprises a plurality of groups of guide vanes (3), a rotating shaft (4), and an adjusting screw (7), the adjusting screw (7), the rotating shaft (4), and the guide vanes (3) are connected in sequence, a screw hole (8) for inserting the rotating shaft (4) is radially opened on the shell (1), the adjusting screw (7) can be threadedly connected to the screw hole (8), a plurality of guide vanes (3) are distributed at equal angles around the center of the wind cavity (13) to form a ring, and the guide vanes (3) are detachably connected to the rotating shaft (4).

2. The assembled axial flow fan according to claim 1, characterized in that: The bottom end of the rotating shaft (4) is provided with a fixing groove (5) for inserting the guide plate (3), and the rotating shaft (4) is threadedly connected with a fixing bolt (6) corresponding to the guide plate (3).

3. The assembled axial flow fan according to claim 1, characterized in that: The adjusting screw rod (7) has a threaded sleeve (9) on it.

4. The assembled axial flow fan according to claim 1, characterized in that: A plurality of angle grooves (10) are axially provided on the outer wall of the adjusting screw (7), and arrows (12) corresponding to the centers of the screw holes (8) are circumferentially provided on the outer wall of the housing (1).

5. The assembled axial flow fan according to claim 4, characterized in that: A mark (11) for identifying an angle is arranged in each of the angle grooves (10).

Images