Blade angle synchronous adjustment centrifugal fan

Abstract

The utility model relates to the technical field of ventilator, concretely to a kind of blade angle synchronous adjustment centrifugal fan, including ventilator shell, the front side of ventilator shell is equipped with air inlet, the rear side of ventilator shell is equipped with motor, the output shaft of motor extends to the inner chamber of ventilator shell, and surface is equipped with rear end plate.This scheme can when the angle of synchronous adjustment fan leaf, staff first loosens fixed component, so that annular ring can rotate, subsequently hold grip lever and move, so that annular ring rotates, annular ring drives gear ring to rotate, gear ring is engaged in synchronous rotation in the process of rotation multiple gear, gear rotates by rotating lever corresponding fan leaf around respective axis is driven to rotate, so that it carries out angle adjustment, when adjusting to specified position, fixed component is locked again, so that annular ring is fixed, prevent fan leaf self-rotating, to solve the problem that existing centrifugal fan cannot carry out blade angle synchronous adjustment.

Description

Technical Field

[0001] This utility model relates to the field of ventilation fan technology, specifically a centrifugal fan with synchronously adjustable blade angle. Background Technology

[0002] Centrifugal fans are widely used as important gas transport equipment in industrial production and daily life, covering many fields such as ventilation in factory workshops, exhaust of harmful gases in mines, building ventilation systems, and environmental protection processes.

[0003] However, in actual operation, traditional centrifugal fans have significant limitations in air volume adjustment due to their fixed blade angle. When the actual required air volume is less than the rated air volume, the valve opening is often adjusted to throttle the flow. Although this method can reduce the air volume, it essentially changes the fan's operating point by increasing system resistance, resulting in a large amount of energy being consumed by the valve. This causes the fan to operate in a low-efficiency, high-energy-consumption state for a long time, resulting in serious energy waste.

[0004] Therefore, a centrifugal fan capable of synchronously adjusting the blade angle was developed to change the fan's output performance at the source, rather than consuming energy in the pipeline. Utility Model Content

[0005] The purpose of this invention is to provide a centrifugal fan with synchronous blade angle adjustment to solve the problem mentioned in the background art that existing centrifugal fans cannot perform synchronous blade angle adjustment.

[0006] To achieve the above objectives, this utility model provides the following technical solution, including a ventilation fan housing. An air inlet is provided on the front side of the ventilation fan housing. A motor is installed on the rear side of the ventilation fan housing. The output shaft of the motor extends into the inner cavity of the ventilation fan housing and has a rear end plate on its surface. A front end plate is fixedly connected to the front side of the rear end plate via a connecting rod. A fan blade is rotatably connected to the annular area between the rear end plate and the front end plate via multiple rotating rods. The rear side of each rotating rod extends into the inner cavity of the rear end plate and is rotatably connected to its inner wall. A gear is fixedly connected to the surface of the rotating rod. A gear ring meshes with the inner side of the gear. The surface of the gear ring is movably connected to the inner wall of the rear end plate. A positioning shell is fixedly connected to the front side of the rear end plate. A ring is rotatably connected to the inner cavity of the positioning shell. The positioning shell and the ring are fixedly assembled. The rear side of the ring extends into the inner cavity of the rear end plate and is fixedly connected to the gear ring. An opening is provided on the front side of the positioning shell. A handle is fixedly connected to the front side of the ring. The front side of the handle extends to the outer side of the positioning shell through the opening.

[0007] Preferably, the fixing component includes bolts, and both the positioning shell and the ring have threaded holes that are mated together, with bolts threaded into the mating threaded holes.

[0008] Preferably, a pointer is fixedly connected to the surface of the grip, and a scale plate is fixedly connected to the front side of the rear end plate at the position corresponding to the pointer.

[0009] Preferably, the inner cavity of the rear end plate is provided with a limiting groove, and the inner cavity of the limiting groove is movably connected to a limiting ring, the surface of the limiting ring being fixedly connected to the inner side of the toothed ring.

[0010] Preferably, a reinforcing rod is fixedly connected to the front side of the rear end plate, and the front side of the reinforcing rod is fixedly connected to the front end plate.

[0011] Preferably, the air inlet of the ventilator casing is fixedly connected to a guide plate, and the inner wall of the guide plate is arranged in a streamlined structure.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This solution allows operators to first loosen the fixing component to allow the ring to rotate during synchronous blade angle adjustment. Then, by grasping the lever and moving it, the ring rotates, causing the gear ring to rotate. During this rotation, the gear ring engages multiple gears, which rotate synchronously. As the gears rotate, they drive the corresponding fan blades to rotate around their respective axes via a rotating rod, thus adjusting their angles. Once the desired position is reached, the fixing component is tightened again to secure the ring and prevent the fan blades from rotating on their own. This solves the problem of existing centrifugal fans being unable to synchronously adjust blade angles. Attached Figure Description

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

[0015] Figure 2 This is a rear view of the ventilator housing of this utility model;

[0016] Figure 3 This is a side view of the main structure of this utility model;

[0017] Figure 4 This is a partial structural diagram of the present invention;

[0018] Figure 5 This is a partial structural cross-sectional view of the present invention;

[0019] Figure 6 This is an exploded view of a partial structure of this utility model.

[0020] In the diagram: 1. Fan housing; 2. Motor; 3. Rear end plate; 4. Front end plate; 5. Fan blade; 6. Gear; 7. Gear ring; 8. Positioning shell; 9. Ring; 10. Handle; 11. Bolt; 12. Pointer; 13. Scale plate; 14. Limiting ring; 15. Reinforcing rod; 16. Guide plate. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] Example 1:

[0024] Please see Figure 1-6 This utility model provides a technical solution: a centrifugal fan with synchronously adjustable blade angle, including a fan housing 1. An air inlet is provided on the front side of the fan housing 1. A motor 2 is installed on the rear side of the fan housing 1. The output shaft of the motor 2 extends into the inner cavity of the fan housing 1, and a rear end plate 3 is provided on its surface. A front end plate 4 is fixedly connected to the front side of the rear end plate 3 via a connecting rod. A fan blade 5 is rotatably connected to the annular area between the rear end plate 3 and the front end plate 4 via multiple rotating rods. The rear side of each rotating rod extends into the inner cavity of the rear end plate 3 and rotates with its inner wall. A gear 6 is fixedly connected to the surface of the rotating rod. A gear ring 7 meshes with the inner side of the gear 6. The surface of the gear ring 7 is movably connected to the inner wall of the rear end plate 3. A positioning shell 8 is fixedly connected to the front side of the rear end plate 3. A ring 9 is rotatably connected to the inner cavity of the positioning shell 8. The positioning shell 8 and the ring 9 are fixed together. The rear side of the ring 9 extends into the inner cavity of the rear end plate 3 and is fixedly connected to the gear ring 7. An opening is provided on the front side of the positioning shell 8. A grip rod 10 is fixedly connected to the front side of the ring 9. The front side of the grip rod 10 extends to the outer side of the positioning shell 8 through the opening.

[0025] Analysis of the above content: When the centrifugal fan is in use, the operator starts motor 2, and the output shaft of motor 2 drives... Figure 3The overall structure rotates, and during the rotation, the centrifugal force violently throws the air between the fan blades 5 toward the outer edge of the impeller (composed of the rear end plate 3, the front end plate 4 and multiple fan blades 5), forming a low-pressure zone in its central area. Because the external atmospheric pressure is higher, the air will be automatically compressed into this low-pressure zone. The air that newly flows into the inner cavity of the fan casing 1 is accelerated and pressurized in the impeller (the flow channel surrounded by the rear end plate 3, the front end plate 4 and the fan blades 5), and finally is thrown into the edge of the volute cavity inside the fan casing 1 by the centrifugal force and discharged from the outlet.

[0026] When it is necessary to adjust the angle of fan blade 5 synchronously, the operator turns off motor 2. Figure 3 The overall structure stops rotating. At this point, the operator first loosens the fixing component, allowing the ring 9 to rotate. Then, the operator grasps the handle 10 and moves it, causing the ring 9 to rotate. The ring 9 drives the gear ring 7 to rotate. During the rotation, the gear ring 7 meshes with multiple gears 6 and rotates synchronously. When the gears 6 rotate, they drive the corresponding fan blades 5 to rotate around their respective axes via the rotating rod, thus adjusting their angles. When the angle of the fan blades 5 is increased, the airflow entering the fan housing 1 increases; when the angle of the fan blades 5 is decreased, the airflow entering the fan housing 1 decreases. When the angle of the fan blades 5 is adjusted to the designated position, the operator stops the ring 9 and re-locks the fixing component to fix the ring 9, thereby preventing the fan blades 5 from rotating on their own. This solves the problem that existing centrifugal fans cannot synchronously adjust the blade angles.

[0027] Example 2:

[0028] Please see Figure 1-6 Based on Embodiment 1, this utility model provides a technical solution: the fixing component includes a bolt 11, and the positioning shell 8 and the ring 9 are both provided with threaded holes and are connected to each other, and the bolt 11 is threadedly connected in the threaded holes.

[0029] Analysis of the above content: When the angle of the fan blade 5 is at its minimum, all the threaded holes on the ring 9 and the positioning shell 8 are aligned. The operator only needs to screw the bolt 11 into the aligned threaded holes to make the ring 9 and the positioning shell 8 rigidly connected. If it is necessary to fix it after rotating the ring 9, some of the threaded holes of the ring 9 will be misaligned after rotation, but some holes will still remain aligned. Since the ring 9 is not confined in the positioning shell 8, the bolt 11 can also be screwed into these still aligned holes to complete the fixation.

[0030] Example 3:

[0031] Please see Figure 1-6 Based on Embodiment 1, this utility model provides a technical solution: a pointer 12 is fixedly connected to the surface of the grip 10, and a scale plate 13 is fixedly connected to the front side of the rear end plate 3 corresponding to the position of the pointer 12.

[0032] Analysis of the above content: When the operator moves the lever 10, the pointer 12 on it will move accordingly. During the movement, the pointer 12 will point to the current displacement value on the scale plate 13. The operator can judge the current rotation angle of the fan blade 5 by observing the displacement value pointed to by the pointer 12.

[0033] Example 4:

[0034] Please see Figure 1-6 Based on Embodiment 1, this utility model provides a technical solution: a limiting groove is formed in the inner cavity of the rear end plate 3, and a limiting ring 14 is movably connected to the inner cavity of the limiting groove. The surface of the limiting ring 14 is fixedly connected to the inner side of the toothed ring 7.

[0035] Analysis of the above content: By setting the limiting ring 14 to limit the toothed ring 7, the limiting groove firmly restricts the limiting ring 14 during the rotation process, thereby limiting the toothed ring 7 and making the toothed ring 7 rotate smoothly without misalignment.

[0036] Example 5:

[0037] Please see Figure 1-6 Based on Embodiment 1, this utility model provides a technical solution: a reinforcing rod 15 is fixedly connected to the front side of the rear end plate 3, and the front side of the reinforcing rod 15 is fixedly connected to the front end plate 4.

[0038] Analysis of the above content: By setting the reinforcing rod 15 to reinforce the inner ring between the rear end plate 3 and the front end plate 4, it is possible to prevent the rear end plate 3 and the front end plate 4 from being poorly fixed by only the connecting rod of the outer ring, which would cause the front end plate 4 to separate from the rear end plate 3 during high-speed rotation.

[0039] Example 6:

[0040] Please see Figure 1-6 Based on Embodiment 1, this utility model provides a technical solution: the air inlet of the ventilator housing 1 is fixedly connected to a guide plate 16, and the inner wall of the guide plate 16 is arranged in a streamlined structure.

[0041] Analysis of the above content: The inner wall of the baffle 16 adopts a streamlined structure, which can effectively guide and smooth the intake airflow, reduce eddies and resistance, and allow outside air to enter the fan housing 1 more quickly, significantly improving intake efficiency and reducing the impact loss of the air inlet.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A centrifugal fan with synchronously adjustable blade angle, characterized in that, include: A fan housing (1) has an air inlet on its front side and a motor (2) installed on its rear side. The output shaft of the motor (2) extends into the inner cavity of the fan housing (1) and has a rear end plate (3) on its surface. A front end plate (4) is fixedly connected to the front side of the rear end plate (3) via a connecting rod. A fan blade (5) is rotatably connected to the annular area between the rear end plate (3) and the front end plate (4) via multiple rotating rods. The rear side of the rotating rod extends into the inner cavity of the rear end plate (3) and is rotatably connected to its inner wall. A gear (6) is fixedly connected to the surface of the rotating rod. A toothed ring (7) is engaged on the inner side of the wheel (6). The surface of the toothed ring (7) is movably connected to the inner wall of the rear end plate (3). A positioning shell (8) is fixedly connected to the front side of the rear end plate (3). A ring (9) is rotatably connected to the inner cavity of the positioning shell (8). The positioning shell (8) and the ring (9) are fixed together. The rear side of the ring (9) extends to the inner cavity of the rear end plate (3) and is fixedly connected to the toothed ring (7). An opening is provided on the front side of the positioning shell (8). A handle (10) is fixedly connected to the front side of the ring (9). The front side of the handle (10) extends to the outer side of the positioning shell (8) through the opening.

2. The centrifugal fan with synchronously adjustable blade angle according to claim 1, characterized in that: The fixing component includes a bolt (11), and the positioning shell (8) and the ring (9) are both provided with threaded holes and are connected to each other. The threaded holes are threaded with bolts (11).

3. A centrifugal fan with synchronously adjustable blade angle according to claim 1, characterized in that: A pointer (12) is fixedly connected to the surface of the grip (10), and a scale plate (13) is fixedly connected to the front side of the rear end plate (3) at the position corresponding to the pointer (12).

4. A centrifugal fan with synchronously adjustable blade angle according to claim 1, characterized in that: The inner cavity of the rear end plate (3) is provided with a limiting groove, and the inner cavity of the limiting groove is movably connected to a limiting ring (14), and the surface of the limiting ring (14) is fixedly connected to the inner side of the toothed ring (7).

5. A centrifugal fan with synchronously adjustable blade angle according to claim 1, characterized in that: A reinforcing rod (15) is fixedly connected to the front side of the rear end plate (3), and the front side of the reinforcing rod (15) is fixedly connected to the front end plate (4).

6. A centrifugal fan with synchronously adjustable blade angle according to claim 1, characterized in that: The air inlet of the ventilator housing (1) is fixedly connected to a guide plate (16), and the inner wall of the guide plate (16) is arranged in a streamlined structure.

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