An inlet-adjustable box-type centrifugal fan

Abstract

The utility model relates to centrifugal fan technical field discloses a kind of adjustable box-type centrifugal fan of air inlet, including cabinet, hinged operation door is in cabinet, centrifugal fan body is installed in cabinet, impeller is rotatably arranged in the inside of centrifugal fan body, air inlet of centrifugal fan body is detached and installed with import vane adjusting structure and iris air valve structure, brake is arranged between import vane adjusting structure and iris air valve structure, import vane adjusting structure and iris air valve structure are limited by brake, overcome the defect that traditional fixed air inlet fan cannot adapt to variable working condition mentioned in background art, user does not need to additionally replace different angle impeller or separately adjust air inlet area, just need to complete the adjustment of air inlet area and wind pressure characteristic simultaneously by rotating mechanical ring handle, it is convenient to operate, different ventilation demand can be responded quickly, greatly improve the working condition adaptability of fan.

Description

Technical Field

[0001] This utility model belongs to the field of centrifugal fan technology, specifically, it relates to a box-type centrifugal fan with an adjustable air inlet. Background Technology

[0002] A box-type centrifugal fan is a device that generates airflow through centrifugal force. It mainly consists of components such as a fan, motor, impeller, and casing. However, with the increasing demands for fan performance in industry, traditional fans with fixed air inlets can no longer meet the needs of changing operating conditions. Adjustable air inlet technology has emerged to address this need, enabling precise control of airflow and air pressure through mechanical or electric means.

[0003] The prior art discloses a high-strength box-type centrifugal fan (CN218093490U), which includes a box body with an output port and an input port. A housing and a rotating motor are fixed inside the box body. An air inlet and an air outlet are provided on the housing body. A rotating shaft is rotatably connected to the inner wall of the housing body. Multiple blades are evenly fixed along the circumference of the circular side plate. A connecting ring is fixedly connected to the blade. The fan includes a reinforcing plate coaxially fixed to the rotating shaft. The reinforcing plate is sleeved on the rotating shaft. Multiple reinforcing rods are provided between the reinforcing plate and the connecting rings. A fixing assembly for fixing the multiple reinforcing rods to the reinforcing plate is also provided on the reinforcing plate.

[0004] The search revealed that the existing technology has a fixed air inlet structure and lacks measures to control air volume and air pressure. It is necessary to replace impellers with different angles or adjust the size of the air inlet, which cannot meet the needs of various working conditions. Furthermore, the additional replacement measures not only require precise adjustment of the blade angle and air inlet area, but also increase economic costs. This is time-consuming and labor-intensive, and will also affect the working efficiency of the device.

[0005] In view of this, this utility model is proposed. Utility Model Content

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows: A box-type centrifugal fan with an adjustable air inlet, comprising: The housing has an operating door hinged to it. A centrifugal fan body is installed inside the housing. An impeller is rotatably installed inside the centrifugal fan body. An inlet blade adjustment structure and an iris valve structure are detachably installed at the air inlet of the centrifugal fan body. A braking component is provided between the inlet blade adjustment structure and the iris valve structure. The inlet blade adjustment structure and the iris valve structure are limited by the braking component.

[0007] In a preferred embodiment of this utility model, the inlet blade adjustment structure includes a mounting plate, inlet blades, a rotating ring, and slotted plates. The mounting plate is fixedly installed on the air inlet side of the centrifugal fan body by bolts. Multiple inlet blades are arranged in a ring array in the inner ring of the mounting plate. Each of the multiple inlet blades is fixedly connected to a slotted plate. The rotating ring rotates between the multiple slotted plates.

[0008] In a preferred embodiment of this utility model, an air vent ring is fixedly provided on the inner side of the mounting plate, and multiple bearing holes are arranged in a ring array on the air vent ring. A support shaft is fixedly provided at the center of the inlet blade, and multiple support shafts are rotatably connected to the same mounting shaft. The support shaft passes through the air vent ring and is rotatably connected in the bearing hole.

[0009] In a preferred embodiment of the present invention, the rotating ring is rotatably connected to the outer wall of the air vent ring, and a plurality of abutment shafts are arranged in a ring array on the outer wall of the rotating ring, and the abutment shafts slide correspondingly in the slot plate.

[0010] In a preferred embodiment of the present invention, the iris valve structure includes an iris valve body and a mechanical ring handle. The iris valve body is fixedly installed on the air outlet ring, and the mechanical ring handle is installed on the iris valve body and connected to the blades inside the iris valve body.

[0011] In a preferred embodiment of this utility model, the braking component includes an end face ratchet ring and a compression spring. A pressure plate for pressing is symmetrically arranged on both sides of the end face ratchet ring. An annular contraction groove is provided on the mounting plate. A compression spring is fixedly arranged between the end face ratchet ring and the annular contraction groove. The end face ratchet ring is elastically connected to the annular contraction groove through the compression spring. The mechanical ring handle is fixed to the rotating ring by bolts. The mechanical ring handle is locked by the end face ratchet ring.

[0012] Compared with the prior art, the present invention has the following advantages: 1. This utility model integrates the inlet blade adjustment structure and the iris valve structure into the air inlet of the centrifugal fan body, and achieves linkage between the two through the fixing of the mechanical ring handle and the rotating ring. When the mechanical ring handle is rotated, on the one hand, it drives the blades of the iris valve body to open and close, directly changing the effective flow area of ​​the air inlet, thereby adjusting the air volume and balancing the change in air pressure after the rotation angle of the inlet blades by adjusting the air inlet area; on the other hand, it drives the rotating ring to rotate, and through the cooperation of the abutment shaft and the slot plate, drives the inlet blades to rotate synchronously, changing the air inlet angle. This linkage adjustment allows the air volume to change while the angle of the airflow entering the impeller can be optimized by adjusting the angle of the inlet blades, thereby balancing the air pressure fluctuations caused by changes in air volume or blade angle, ensuring that the fan can maintain high operating efficiency and stability under different operating conditions.

[0013] 2. It overcomes the shortcomings of traditional fixed air inlet fans mentioned in the background technology, which cannot adapt to changing working conditions. Users do not need to replace impellers with different angles or adjust the air inlet area separately. They can adjust the air inlet area and air pressure characteristics at the same time by simply rotating the mechanical ring handle. It is easy to operate and can quickly respond to different ventilation needs, greatly improving the adaptability of the fan to working conditions.

[0014] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0015] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram showing the disassembly and installation of the impeller, the inlet blade adjustment structure, and the iris valve structure of this utility model; Figure 3 This is a schematic diagram showing the disassembly and installation of the iris air valve structure, braking component, and mounting plate of this utility model; Figure 4 This is a disassembly and installation diagram of the internal structure of the imported blade adjustment structure of this utility model; Figure 5 This utility model Figure 4 Enlarged diagram of point A in the middle.

[0016] In the diagram: 10. Housing; 11. Operating door; 12. Centrifugal fan body; 13. Impeller; 14. Mounting plate; 15. Iris damper body; 16. Mechanical ring handle; 17. End face ratchet ring; 18. Inlet blade; 19. Mounting shaft; 20. Compression spring; 21. Annular shrinkage groove; 22. Pressure plate; 23. Bearing hole; 24. Rotating ring; 25. Support shaft; 26. Abutment shaft; 27. Groove plate; 28. Air outlet ring. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model.

[0018] A box-type centrifugal fan with an adjustable air inlet, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, including The housing 10 has an operating door 11 hinged to it. A centrifugal fan body 12 is installed inside the housing 10. An impeller 13 is rotatably installed inside the centrifugal fan body 12. An inlet blade adjustment structure and an iris valve structure are detachably installed at the air inlet of the centrifugal fan body 12. A braking component is provided between the inlet blade adjustment structure and the iris valve structure. The inlet blade adjustment structure and the iris valve structure are limited by the braking component.

[0019] Specifically, the housing 10 has a square output port and a round input port. The input port is located on the operating door 11. A centrifugal fan body 12 is fixed inside the housing 10. The centrifugal fan body 12 includes a housing and a rotary motor. The housing has a round air inlet and a square air outlet. The air inlet is connected to the input port, and the air outlet is connected to the output port. A rotating shaft is rotatably connected to the inner wall of the housing. The end of the rotating shaft that extends through the housing to the outside of the housing is driven by the rotary motor via a belt. An impeller 13 is coaxially fixed on the rotating shaft. When the centrifugal fan body 12 is running, the rotary motor is started. The rotary motor drives the rotating shaft to rotate the impeller 13 via the belt drive. Air enters the air inlet of the housing from the input port of the housing 10. The air volume and air pressure are changed by the inlet blade adjustment structure and the iris valve structure. Finally, the air is discharged from the air outlet of the housing through the output port of the housing 10. It is worth noting that the usage of the centrifugal fan body 12 and the connection relationship between the centrifugal fan body 12 and the housing 10 are described in detail in the prior art of a high-strength box-type centrifugal fan (CN218093490U), and will not be repeated here.

[0020] like Figure 1 and Figure 4 As shown, the inlet blade adjustment structure includes a mounting plate 14, inlet blades 18, a rotating ring 24, and a slotted plate 27. The mounting plate 14 is fixedly installed on the air inlet side of the centrifugal fan body 12 by bolts. Multiple inlet blades 18 are arranged in a ring array in the inner ring of the mounting plate 14. Each of the multiple inlet blades 18 is fixedly connected to a slotted plate 27. The rotating ring 24 rotates between the multiple slotted plates 27. like Figure 4 As shown, an air vent ring 28 is fixedly installed on the inner side of the mounting plate 14. Multiple bearing holes 23 are arranged in a ring array on the air vent ring 28. A support shaft 25 is fixedly installed at the center of the inlet blade 18. Multiple support shafts 25 are rotatably connected to the same mounting shaft 19. The mounting shaft 19 is coaxially arranged with the air vent ring 28. The support shaft 25 passes through the air vent ring 28 and is rotatably connected in the bearing hole 23. like Figure 4 and Figure 5 As shown, the rotating ring 24 is rotatably connected to the outer wall of the air vent ring 28. Multiple abutment shafts 26 are arranged in a ring array on the outer wall of the rotating ring 24, and the abutment shafts 26 slide in the slot plate 27.

[0021] The working principle is as follows: The mounting plate 14 is fixed to the air inlet end face of the centrifugal fan body 12 by bolts. A vent ring 28 is coaxially arranged at its center. The outer ring of the vent ring 28 has no less than twelve bearing holes 23 arranged in a ring to support the support shaft 25 of the inlet blades 18. The support shaft 25 passes through the bearing holes 23 and is rotatably connected to the mounting shaft 19 to ensure that the inlet blades 18 rotate synchronously around the mounting shaft 19. The rotating ring 24 is sleeved on the outside of the vent ring 28. Its inner wall is rotatably connected to the outer wall of the vent ring 28 by ball bearings. Twelve abutment shafts 26 are evenly arranged on the outer ring of the rotating ring 24. Each abutment shaft 26 is inserted into a long slot of a slotted plate 27. The slotted plate 27 is welded to the tail of the inlet blades 18. When the rotating ring 24 rotates clockwise or counterclockwise, the abutment shaft 26 slides in the slot, pushing the inlet blades 18 to swing around the support shaft 25 to achieve blade angle adjustment.

[0022] like Figure 2 and Figure 3 As shown, the iris valve structure includes an iris valve body 15 and a mechanical ring handle 16. The iris valve body 15 is fixedly installed on the air outlet ring 28, and the mechanical ring handle 16 is installed on the iris valve body 15 and connected to the blades inside the iris valve body 15. like Figure 2 , Figure 3 and Figure 4 As shown, the braking component includes an end face ratchet ring 17 and a compression spring 20. A pressure plate 22 for pressing is symmetrically arranged on both sides of the end face ratchet ring 17. An annular contraction groove 21 is provided on the mounting plate 14. The compression spring 20 is fixedly arranged between the end face ratchet ring 17 and the annular contraction groove 21. The end face ratchet ring 17 is elastically connected to the annular contraction groove 21 through the compression spring 20. The mechanical ring handle 16 and the rotating ring 24 are fixed by bolts. The mechanical ring handle 16 is locked by the end face ratchet ring 17. A ring of ratchet teeth is provided on the side of the mechanical ring handle 16 near the end face ratchet ring 17. The mechanical ring handle 16 is locked to the end face ratchet ring 17 through the ratchet teeth. A circular ring is fixedly provided on the side of the end face ratchet ring 17 near the annular contraction groove 21. The circular ring slides in the annular contraction groove 21.

[0023] The working principle is as follows: the iris valve body 15 is a mature existing component, with multiple fan-shaped valve plates inside. The valve plates are driven to open and close synchronously via a mechanical ring handle 16, achieving adjustment of the air inlet area. The lower end of the mechanical ring handle 16 is fixed to the rotating ring 24 by bolts, forming a linkage adjustment structure. When the mechanical ring handle 16 rotates, it synchronously drives the rotating ring 24 to rotate, thereby synchronously adjusting the angle of the inlet blades 18 and controlling the opening of the iris valve. This achieves synchronization between the increase / decrease of the inlet blade angle 18 and the increase / decrease of the air inlet area. The end face ratchet ring 17 is elastically embedded in the annular contraction groove 21 of the mounting plate 14 via a compression spring 20. Its inner end face engages with the ratchet teeth on the outer side of the mechanical ring handle 16, forming a one-way lock to prevent the adjusted angle of the inlet blades 18 and the valve opening from shifting due to vibration. During use, it is operated by... Pressing the pressure plates 22 on both sides of the end face ratchet ring 17 compresses the spring 20, causing the end face ratchet ring 17 to slide into the annular contraction groove 21, disengaging from the ratchet. At this point, the mechanical ring handle 16 can be freely rotated. After adjusting to the target position, the pressure plates 22 are released, and the end face ratchet ring 17 resets and locks under the spring force. Rotating the mechanical ring handle 16 clockwise reduces the opening of the iris damper body 15 valve plate, while the inlet blades 18 tilt in the direction of impeller 13 rotation. At this time, the angle between each inlet blade 18 increases, and the two work together to increase the airflow speed to meet the high-pressure air supply requirements. Rotating the mechanical ring handle 16 counterclockwise increases the opening of the iris damper body 15 valve plate, and the inlet blades 18 tend to be horizontal. The angle between each inlet blade 18 decreases, reducing airflow resistance and achieving high-flow ventilation.

[0024] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A box-type centrifugal fan with an adjustable air inlet, characterized in that, include The housing (10) has an operating door (11) hinged on it. A centrifugal fan body (12) is installed inside the housing (10). An impeller (13) is rotatably installed inside the centrifugal fan body (12). An inlet blade adjustment structure and an iris valve structure are disassembled and installed at the air inlet of the centrifugal fan body (12). A braking component is provided between the inlet blade adjustment structure and the iris valve structure. The inlet blade adjustment structure and the iris valve structure are limited by the braking component.

2. A box-type centrifugal fan with an adjustable air inlet according to claim 1, characterized in that, The inlet blade adjustment structure includes a mounting plate (14), inlet blades (18), a rotating ring (24), and a slotted plate (27). The mounting plate (14) is fixedly installed on the air inlet side of the centrifugal fan body (12) by bolts. Multiple inlet blades (18) are arranged in a ring array in the inner ring of the mounting plate (14). Each of the multiple inlet blades (18) is fixedly connected to a slotted plate (27). The rotating ring (24) rotates between the multiple slotted plates (27).

3. A box-type centrifugal fan with an adjustable air inlet according to claim 2, characterized in that, An air vent ring (28) is fixedly provided on the inner side of the mounting plate (14). Multiple bearing holes (23) are arranged in a ring array on the air vent ring (28). A support shaft (25) is fixedly provided at the center of the inlet blade (18). Multiple support shafts (25) are rotatably connected to the same mounting shaft (19). The support shaft (25) passes through the air vent ring (28) and is rotatably connected in the bearing hole (23).

4. A box-type centrifugal fan with an adjustable air inlet according to claim 3, characterized in that, The rotating ring (24) is rotatably connected to the outer wall of the air vent ring (28). Multiple abutment shafts (26) are arranged in a ring array on the outer wall of the rotating ring (24). The abutment shafts (26) slide in the slot plate (27).

5. A box-type centrifugal fan with an adjustable air inlet according to claim 4, characterized in that, The iris valve structure includes an iris valve body (15) and a mechanical ring handle (16). The iris valve body (15) is fixedly installed on the air outlet ring (28), and the mechanical ring handle (16) is installed on the iris valve body (15) and connected to the blade inside the iris valve body (15).

6. A box-type centrifugal fan with an adjustable air inlet according to claim 5, characterized in that, The braking component includes an end face ratchet ring (17) and a compression spring (20). A pressure plate (22) for pressing is symmetrically arranged on both sides of the end face ratchet ring (17). An annular shrinkage groove (21) is provided on the mounting plate (14). The compression spring (20) is fixedly arranged between the end face ratchet ring (17) and the annular shrinkage groove (21). The end face ratchet ring (17) is elastically connected to the annular shrinkage groove (21) through the compression spring (20). The mechanical ring handle (16) is fixed to the rotating ring (24) by bolts. The mechanical ring handle (16) is locked by the end face ratchet ring (17).

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