A multi-stage impeller mounting structure for a centrifugal fan

Abstract

This utility model relates to the technical field of impeller installation, specifically a multi-stage impeller installation structure for a centrifugal fan. It includes a fan casing and a drive shaft. A fixing plate is installed inside the fan casing, and a motor is mounted on the fixing plate. One end of the drive shaft is rotatably connected to the center of the fixing plate, and the drive shaft is also connected to the motor's output end. The structure also includes an impeller mechanism mounted on the drive shaft. The impeller mechanism includes a mounting shaft, a fixing mechanism, multiple sets of blades, and multiple sets of mounting mechanisms. The number of mounting mechanisms corresponds one-to-one with the number of blades. The multiple sets of blades are respectively mounted on the mounting shaft via the multiple sets of mounting mechanisms, and the blades are arranged in multiple rows along the axial direction of the mounting shaft. Each set of mounting mechanisms includes two connecting plates, a first screw, a nut, and a fixing block. A slot is provided on the outer wall of the mounting shaft. This utility model provides a multi-stage impeller installation structure for a centrifugal fan, allowing individual blade replacement when damaged, reducing operating costs.

Description

Technical Field

[0001] This utility model relates to the technical field of impeller installation, specifically a multi-stage impeller installation structure for centrifugal fans. Background Technology

[0002] Centrifugal fans, as core components of gas conveying systems such as ventilation and dust removal, have been widely used in industries such as machinery, power, and chemical engineering. Centrifugal fans are mainly composed of impellers, casings, couplings, and shafts. The impeller is the main working component that generates air pressure and transmits energy.

[0003] A search revealed that Chinese utility model patent CN218377018U discloses an impeller for a centrifugal fan, relating to the field of centrifugal fan technology. It solves the problem of difficulty in improving the strength of existing centrifugal fan impeller discs. The impeller disc comprises an impeller disc and an impeller body, with the impeller body positioned on the outer side of the impeller disc. An assembly hole is provided in the center of the impeller disc, and a forming groove is provided near the root of the impeller body. Sub-blades are welded to the rear side of the forming groove. The partial forming structure increases the strength of the impeller disc while reducing the material thickness. The overall weight of the impeller is reduced, decreasing the load on the main shaft and bearings, and improving the stability of the fan operation. The addition of sub-blades increases strength and also helps reduce leakage at the shaft seal.

[0004] However, when using the above-mentioned existing technical solutions, since most centrifugal fan impeller structures are fixedly welded to the mounting plate, the entire impeller must be replaced when one blade is damaged, which increases the cost of use and causes a decrease in the efficiency of the centrifugal fan impeller structure. Therefore, a multi-stage impeller mounting structure for centrifugal fans is needed to solve the above-mentioned problems. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides a multi-stage impeller mounting structure for centrifugal fans, which allows individual blade replacement when damaged, reducing operating costs.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a multi-stage impeller mounting structure for a centrifugal fan, comprising a fan casing and a drive shaft, a fixed plate disposed inside the fan casing, a motor disposed on the fixed plate, one end of the drive shaft being rotatably connected to the center position of the fixed plate, and the drive shaft being connected to the output end of the motor, and further comprising an impeller mechanism mounted on the drive shaft, the impeller mechanism comprising a mounting shaft, a fixing mechanism, multiple sets of blades and multiple sets of mounting mechanisms, the number of multiple sets of mounting mechanisms corresponding one-to-one with the number of multiple sets of blades, the multiple sets of blades being mounted on the mounting shaft through the multiple sets of mounting mechanisms, the multiple sets of blades being arranged in multiple rows in the axial direction of the mounting shaft;

[0009] Each of the multiple mounting mechanisms includes two sets of connecting plates, a first screw, a nut, and a fixing block. A slot is provided on the outer wall of the mounting shaft, and the fixing block is engaged with the slot. Both sets of connecting plates are connected to the mounting shaft. The fixing block is located at the inner end of the two sets of connecting plates and is slidably connected to the inner end of the two sets of connecting plates. Both sets of connecting plates and the fixing block are provided with a first through hole. The first screw slides through the first through hole and is engaged with the nut.

[0010] Preferably, the fixing mechanism includes a limiting ring and four sets of second screws. The limiting ring is connected to the outer wall of the drive shaft. A sliding hole and four sets of second through holes are provided through the axial position of the center of the mounting shaft. The drive shaft is slidably connected to the sliding hole. Four sets of screw holes are provided on the limiting ring. The four sets of second screws slide through the four sets of second through holes and are connected to the four sets of screw holes. One end of the mounting shaft is tightly attached to one end of the limiting ring.

[0011] Preferably, it also includes a limiting plate, which is axially connected to the outer wall of the drive shaft, and a limiting groove is provided in the sliding hole, and the limiting plate and the limiting groove are slidably engaged.

[0012] Preferably, it also includes a spring washer, which is fitted with the first screw and is located between the nut and the connecting plate.

[0013] Preferably, protective nets are provided on both sides of the fan casing.

[0014] (III) Beneficial Effects

[0015] Compared with the prior art, this utility model provides a multi-stage impeller mounting structure for centrifugal fans, which has the following advantages:

[0016] By setting up an impeller mechanism, multiple sets of blades are mounted on the mounting shaft via an installation mechanism, with the blades arranged in multiple rows along the axial direction of the mounting shaft. Compared to the existing technology of fixed welding of the impeller structure, this allows for independent assembly and disassembly of the blades. When a blade is damaged, only the damaged blade needs to be replaced, without replacing the entire impeller, greatly reducing operating costs. Simultaneously, this structural design makes impeller maintenance more convenient and efficient, significantly improving the performance and efficiency of the centrifugal fan impeller structure, effectively solving the problem of increased costs and reduced efficiency caused by replacing the entire impeller due to blade damage in existing technologies. Furthermore, the multiple mounting mechanisms employ a structure design with connecting plates, first screws, nuts, and fixing blocks in conjunction with slots, ensuring the firmness and stability of the blade installation. While meeting the fan's operational requirements, this further improves the practicality and reliability of the multi-stage impeller mounting structure for centrifugal fans. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the isometric structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the drive shaft, mounting shaft, and their connection structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the limiting groove structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the drive shaft, limiting plate, and their connection structure of this utility model;

[0021] Figure 5 This is a schematic diagram of the spring washer, the first screw, and their connection structure of this utility model.

[0022] Reference numerals in the attached drawings: 1. Fan casing; 2. Drive shaft; 3. Fixing plate; 4. Motor; 5. Mounting shaft; 6. Blade; 7. Connecting plate; 8. First screw; 9. Nut; 10. Fixing block; 11. Slot; 12. Limiting ring; 13. Second screw; 14. Sliding hole; 15. Second through hole; 16. Limiting plate; 17. Limiting groove; 18. Spring washer; 19. Protective net. Detailed Implementation

[0023] 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.

[0024] Example

[0025] Please see Figures 1-5 A multi-stage impeller mounting structure for a centrifugal fan includes a fan casing 1 and a drive shaft 2. A fixing plate 3 is provided inside the fan casing 1, and a motor 4 is provided on the fixing plate 3. One end of the drive shaft 2 is rotatably connected to the center position of the fixing plate 3, and the drive shaft 2 is connected to the output end of the motor 4. The structure also includes an impeller mechanism, which is mounted on the drive shaft 2. The impeller mechanism includes a mounting shaft 5, a fixing mechanism, multiple sets of blades 6, and multiple sets of mounting mechanisms. The number of multiple sets of mounting mechanisms corresponds one-to-one with the number of multiple sets of blades 6. The multiple sets of blades 6 are respectively mounted on the mounting shaft 5 through the multiple sets of mounting mechanisms, and the multiple sets of blades 6 are arranged in multiple rows in the axial direction of the mounting shaft 5.

[0026] Each of the multiple mounting mechanisms includes two sets of connecting plates 7, a first screw 8, a nut 9, and a fixing block 10. A slot 11 is provided on the outer wall of the mounting shaft 5, and the fixing block 10 is engaged with the slot 11. Both sets of connecting plates 7 are connected to the mounting shaft 5. The fixing block 10 is located at the inner end of the two sets of connecting plates 7 and is slidably connected to the inner end of the two sets of connecting plates 7. Both sets of connecting plates 7 and the fixing block 10 are provided with a first through hole. The first screw 8 slides through the first through hole and is engaged with the nut 9. By setting the impeller mechanism, multiple sets of blades 6 are mounted on the mounting shaft 5 through the mounting mechanism, and the blades 6 are arranged in multiple rows in the axial direction of the mounting shaft 5. Compared with the impeller structure fixed welding method in the prior art, the blades 6 can be independently disassembled and assembled. When a single blade 6 is damaged, only the damaged blade 6 needs to be replaced, without replacing the entire impeller, greatly reducing operating costs. Simultaneously, this structural design makes impeller maintenance more convenient and efficient, significantly improving the performance and efficiency of the centrifugal fan impeller structure. It effectively solves the problem of increased costs and reduced efficiency caused by replacing the entire impeller when a blade 6 is damaged, a problem found in existing technologies. Furthermore, the multiple mounting mechanisms utilize a structure with connecting plates 7, first screws 8, nuts 9, and fixing blocks 10 in conjunction with slots 11, ensuring the robustness and stability of the blade 6 installation. While meeting the fan's operational requirements, this further enhances the practicality and reliability of the multi-stage impeller mounting structure for centrifugal fans.

[0027] Please see Figures 1-5The fixing mechanism includes a limiting ring 12 and four sets of second screws 13. The limiting ring 12 is connected to the outer wall of the drive shaft 2. The mounting shaft 5 has a sliding hole 14 and four sets of second through holes 15 through its center axial position. The drive shaft 2 is slidably connected to the sliding hole 14. The limiting ring 12 has four sets of screw holes. The four sets of second screws 13 slide through the four sets of second through holes 15 and are connected to the four sets of screw holes. One end of the mounting shaft 5 is tightly attached to one end of the limiting ring 12. The fixing mechanism includes a limiting ring 12 and four sets of second screws 13. The mounting shaft 5 is slidably connected to the drive shaft 2 through the sliding hole 14 and is connected to the limiting ring 12 by means of the four sets of second screws 13 and the screw holes on the limiting ring 12, so that one end of the mounting shaft 5 is tightly attached to one end of the limiting ring 12, effectively limiting the axial displacement of the mounting shaft 5 on the drive shaft 2.

[0028] Please see Figures 1-5 It also includes a limiting plate 16, which is axially connected to the outer wall of the drive shaft 2. The sliding hole 14 is connected to a limiting groove 17, and the limiting plate 16 and the limiting groove 17 are slidably engaged. The slidable engagement of the limiting plate 16 and the limiting groove 17 further enhances the circumferential positioning of the mounting shaft 5 on the drive shaft 2, thereby ensuring the stability of the impeller mechanism installation and ensuring that the impeller can rotate smoothly when the centrifugal fan is running.

[0029] Please see Figures 1-5 It also includes a spring washer 18, which is fitted with the first screw 8 and located between the nut 9 and the connecting plate 7. In the mounting mechanism, the spring washer 18 is fitted with the first screw 8 and located between the nut 9 and the connecting plate 7. During the tightening of the nut 9, the spring washer 18 undergoes elastic deformation, which increases the friction between the nut 9 and the connecting plate 7, effectively preventing the nut 9 from loosening due to vibration and other factors during the operation of the centrifugal fan. This improves the reliability of the connection between the blade 6 and the mounting shaft 5 and ensures the safety of the impeller mechanism during high-speed operation.

[0030] Please see Figures 1-5 The fan casing 1 is equipped with protective nets 19 on both sides. The protective nets 19 on both sides of the fan casing 1 can effectively block external debris from entering the fan casing 1, prevent debris from colliding with the high-speed rotating impeller mechanism, prevent damage to the blades 6, and also reduce the risk of operators being injured due to accidental contact with rotating parts, thus providing a guarantee for the safe operation of the centrifugal fan and the safety of personnel.

[0031] In summary, this multi-stage impeller mounting structure for centrifugal fans, through the impeller mechanism, mounts multiple sets of blades 6 onto the mounting shaft 5 via a mounting mechanism. The blades 6 are arranged in multiple rows along the axial direction of the mounting shaft 5. Compared to the existing technology's fixed welding method for the impeller structure, this allows for independent assembly and disassembly of the blades 6. When a blade 6 is damaged, only the damaged blade 6 needs to be replaced, eliminating the need to replace the entire impeller, significantly reducing operating costs. Simultaneously, this structural design makes impeller maintenance more convenient and efficient, significantly improving the performance and efficiency of the centrifugal fan impeller structure. It effectively solves the problem of increased costs and reduced efficiency caused by replacing the entire impeller due to damaged blades 6 in existing technologies. Furthermore, the multi-stage mounting mechanism employs a design with a connecting plate 7, a first screw 8, a nut 9, and a fixing block 10 in conjunction with a slot 11, ensuring the robustness and stability of the blade 6 installation. While meeting the fan's operational requirements, this further enhances the practicality and reliability of the multi-stage impeller mounting structure for centrifugal fans.

[0032] This motor 4 is a commercially available device known to those skilled in the art. We are simply using it here without making any structural or functional improvements, which we will not elaborate on here. The motor 4 is equipped with a matching control switch, and the installation position of the control switch is selected according to actual usage needs to facilitate operation and control by the operator.

[0033] The above embodiments merely illustrate specific implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A multi-stage impeller mounting structure for a centrifugal fan, comprising a fan casing (1) and a drive shaft (2), wherein a fixing plate (3) is disposed inside the fan casing (1), a motor (4) is disposed on the fixing plate (3), one end of the drive shaft (2) is rotatably connected to the center position of the fixing plate (3), and the drive shaft (2) is connected to the output end of the motor (4), characterized in that, Also includes: The impeller mechanism is mounted on the drive shaft (2). The impeller mechanism includes a mounting shaft (5), a fixing mechanism, multiple sets of blades (6) and multiple sets of mounting mechanisms. The number of multiple sets of mounting mechanisms corresponds one-to-one with the number of multiple sets of blades (6). The multiple sets of blades (6) are mounted on the mounting shaft (5) through the multiple sets of mounting mechanisms. The multiple sets of blades (6) are arranged in multiple rows in the axial direction of the mounting shaft (5). Each of the multiple installation mechanisms includes two sets of connecting plates (7), a first screw (8), a nut (9), and a fixing block (10). A slot (11) is provided on the outer wall of the installation shaft (5). The fixing block (10) is engaged with the slot (11). Both sets of connecting plates (7) are connected to the installation shaft (5). The fixing block (10) is located at the inner end of the two sets of connecting plates (7) and is slidably connected to the inner end of the two sets of connecting plates (7). Both sets of connecting plates (7) and the fixing block (10) are provided with a first through hole. The first screw (8) slides through the first through hole and is engaged with the nut (9).

2. The multi-stage impeller mounting structure for a centrifugal fan according to claim 1, characterized in that: The fixing mechanism includes a limiting ring (12) and four sets of second screws (13). The limiting ring (12) is connected to the outer wall of the drive shaft (2). The mounting shaft (5) is provided with a sliding hole (14) and four sets of second through holes (15) at the center axial position. The drive shaft (2) is slidably connected to the sliding hole (14). The limiting ring (12) is provided with four sets of screw holes. The four sets of second screws (13) slide through the four sets of second through holes (15) and are connected to the four sets of screw holes. One end of the mounting shaft (5) is tightly attached to one end of the limiting ring (12).

3. The multi-stage impeller mounting structure for a centrifugal fan according to claim 2, characterized in that: It also includes a limiting plate (16), which is axially connected to the outer wall of the drive shaft (2), and the sliding hole (14) is connected to a limiting groove (17), and the limiting plate (16) and the limiting groove (17) are slidably engaged.

4. The multi-stage impeller mounting structure for a centrifugal fan according to claim 3, characterized in that: It also includes a spring washer (18), which is fitted with the first screw (8) and is located between the nut (9) and the connecting plate (7).

5. The multi-stage impeller mounting structure for a centrifugal fan according to claim 4, characterized in that: The fan casing (1) is provided with protective nets (19) on both sides.

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