Multi-stage centrifugal fan

Abstract

The utility model relates to the technical field of centrifugal fans, in particular to a multi-stage centrifugal fan which comprises a tank body, a placing plate is arranged below the tank body, the tank body is fixedly connected with the placing plate through a first connecting table, a second connecting table is fixedly installed on the upper surface of the placing plate, a motor is fixedly connected to the top of the second connecting table, and the motor is fixedly connected with a fan. The output end of the motor is fixedly connected with a rotating shaft, the outer surface of the rotating shaft is fixedly sleeved with a mounting shell, the outer surface of the mounting shell is fixedly connected with an impeller, a plurality of first grooves are formed in the outer surface of the impeller, and a second groove is formed in the top of the impeller; and a third groove is formed in the top of the impeller, and a spring is fixedly connected to the bottom of the third groove. The fan impeller is reasonable in structure, the single impeller blade can be detached and replaced when the fan impeller is used, and the maintenance cost of a fan is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the field of centrifugal fans, in particular to a multi-stage centrifugal fan. Background Art

[0002] A multi-stage centrifugal fan is a rotating blade machine that converts mechanical energy into gas pressure energy. After the gas enters the impeller evenly through the air inlet chamber, it is subjected to the centrifugal force in the rotating blades and the expansion pressure in the impeller, so that most of its velocity energy is converted into pressure energy. In this way, the gas is compressed continuously through several stages to obtain the required pressure.

[0003] However, in the existing centrifugal fans, the blades and the impeller are an integrated whole. Long-term operation may cause some of the blades to be damaged. If they are not replaced, certain dangers may occur. However, replacement usually requires replacing the entire impeller, which undoubtedly increases the cost of fan maintenance. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a multi-stage centrifugal fan.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a multi-stage centrifugal fan, comprising a tank body, a placement plate is arranged below the tank body, the tank body and the placement plate are fixedly connected through a first connecting platform, a second connecting platform is fixedly installed on the upper surface of the placement plate, a motor is fixedly connected to the top of the second connecting platform, a rotating shaft is fixedly connected to the output end of the motor, a mounting shell is fixedly sleeved on the outer surface of the rotating shaft, an impeller is fixedly connected to the outer surface of the mounting shell, the number of the impellers is multiple, a first groove is opened on the outer surface of the impeller, the number of the first grooves is multiple, a second groove is opened on the top of the impeller, the number of the second grooves is multiple, a third groove is opened on the top of the impeller, the number of the third grooves is multiple, a spring is fixedly connected to the bottom of the multiple second grooves, a fixing pin is arranged inside the second groove, the spring is located on the right side of the fixing pin, a blade is arranged inside the first groove, a first through hole is opened inside the blade, the number of the first through holes is multiple, a rotating disk is movably installed on the left surface of the impeller, a second through hole is opened on the left side of the rotating disk, the number of the second through holes is multiple.

[0006] As a further description of the above technical solution:

[0007] The second connecting platform is located on the right side of the first connecting platform, and the fixing pin is located inside the first through hole.

[0008] As a further description of the above technical solution:

[0009] The impeller is movably connected to the tank body, and the first through hole and the second groove have the same cross-sectional shape.

[0010] As a further description of the above technical solution:

[0011] The cross-sectional shape of the second through hole is the same as that of the first through hole, and the cross-sectional shape of the second through hole is the same as that of the fixing pin.

[0012] As a further description of the above technical solution:

[0013] A mounting block is fixedly connected to the outer surface of the rotating disk, and the mounting block is fixedly connected to the third groove by bolts.

[0014] As a further description of the above technical solution:

[0015] An air inlet is fixedly installed on the left side of the tank body, and an air outlet is fixedly connected to the outer surface of the tank body.

[0016] The utility model has the following beneficial effects:

[0017] The multi-stage centrifugal fan includes a blade, a first groove, a second groove, a first through hole, a turntable, an impeller, a second through hole, a fixing pin, a mounting block and a third groove. When in use, the blade is first placed in the first groove so that the second groove corresponds to the first through hole. The bolts fixing the turntable and the impeller are removed, the turntable is rotated so that the position of the second through hole corresponds to the second groove. The fixing pin is inserted into the second groove. After the fixing pin is inserted, the turntable is rotated so that the mounting block is in the same position as the third groove. The mounting block is then fixed to the surface of the impeller by bolts. At this time, the blade is installed. Compared with existing centrifugal fans, the multi-stage centrifugal fan can remove and replace a single blade when in use, which greatly reduces the cost of fan maintenance.

[0018] Compared with the prior art, the multi-stage centrifugal fan includes impellers, a turntable, an impeller, a second through hole, a second groove, a spring and a fixing pin. When the impeller needs to be removed, the bolts fixing the turntable and the impeller are removed, and the turntable is rotated so that the position of the second through hole corresponds to the second groove. At this time, under the action of the spring at the bottom of the second groove, the fixing pin will pop out a certain distance, making it easier to remove the fixing pin. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of a multi-stage centrifugal fan proposed by the utility model;

[0020] Figure 2 This is a cross-sectional view of the overall structure of a multi-stage centrifugal fan proposed by the utility model;

[0021] Figure 3This is a schematic diagram of a multi-stage centrifugal fan proposed by the utility model with the tank body removed;

[0022] Figure 4 This is a schematic diagram of the impeller structure of a multi-stage centrifugal fan proposed by the utility model;

[0023] Figure 5 This is a cross-sectional view of the impeller structure of a multi-stage centrifugal fan proposed by the utility model;

[0024] Figure 6 A multi-stage centrifugal fan proposed by the utility model Figure 5 A magnified view of the structure at center A;

[0025] Figure 7 This is a schematic diagram of the rotating disk structure of a multi-stage centrifugal fan proposed by the utility model;

[0026] Figure 8 This is a top view of the impeller structure of a multi-stage centrifugal fan proposed by the utility model;

[0027] Fig. 9 This is a schematic diagram of the blade structure of a multi-stage centrifugal fan proposed by the utility model;

[0028] Fig.10 This is a top view of the impeller structure of a multi-stage centrifugal fan proposed by the utility model.

[0029] Legend:

[0030] 1. Tank body; 2. Placement plate; 3. First connecting platform; 4. Second connecting platform; 5. Motor; 6. Rotating shaft; 7. Mounting shell; 8. Impeller; 9. First groove; 10. Second groove; 11. Third groove; 12. First through hole; 13. Turntable; 14. Second through hole; 15. Mounting block; 16. Spring; 17. Fixing pin; 18. Air outlet; 19. Air inlet; 20. Impeller blades. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments to help understand the content of the present invention. The methods used in the present invention are all conventional methods unless otherwise specified; the raw materials and devices used are all conventional commercial products unless otherwise specified.

[0032] Reference Figure 1-10The utility model provides a multi-stage centrifugal fan, comprising a tank body 1, a placement plate 2 is arranged below the tank body 1, the tank body 1 and the placement plate 2 are fixedly connected through a first connecting platform 3, and the first connecting platform 3 plays the role of fixing the tank body 1. A second connecting platform 4 is fixedly installed on the upper surface of the placement plate 2, and a motor 5 is fixedly connected to the top of the second connecting platform 4, and the second connecting platform 4 plays the role of fixing the motor 5. The output end of the motor 5 is fixedly connected to a rotating shaft 6, and a mounting shell 7 is fixedly sleeved on the outer surface of the rotating shaft 6, and an impeller 8 is fixedly connected to the outer surface of the mounting shell 7, and the number of impellers 8 is multiple. The outer surface of the impeller 8 is provided with a first groove 9, and the number of the first groove 9 is multiple, and the top of the impeller 8 is provided with a second groove 10, and the number of the second groove 10 is multiple, and the top of the impeller 8 is also provided with a third groove 11, and the number of the third groove 11 is also multiple, and the bottom of the multiple second grooves 10 is fixedly connected with a spring 16, and a fixing pin 17 is also arranged inside the second groove 10, and the spring 16 is located on the right side of the fixing pin 17. The first groove 9 is provided with a blade 20, and a first through hole 12 is provided inside the blade 20, and the number of the first through holes 12 is multiple. A rotating disk 13 is movably mounted on the left surface of the impeller 8, and a second through hole 14 is provided on the left side of the rotating disk 13, and the number of the second through holes 14 is multiple. The second groove 10 is a groove provided for mounting the blade 20.

[0033] The second connecting platform 4 is located on the right side of the first connecting platform 3, and the fixing pin 17 is located inside the first through hole 12. The fixing pin 17 can fix the blade 20 on the impeller 8. The impeller 8 is movably connected to the tank body 1. The cross-sectional shape of the first through hole 12 is the same as that of the second groove 10. The cross-sectional shape of the second through hole 14 is the same as that of the first through hole 12. The cross-sectional shape of the second through hole 14 is the same as that of the fixing pin 17. The outer surface of the rotating disk 13 is fixedly connected with a mounting block 15. The mounting block 15 is fixedly connected to the third groove 11 by bolts. The mounting block 15 can be rotated to control whether the fixing pin 17 is taken out.

[0034] An air inlet 19 is fixedly installed on the left side of the tank body 1, and an air outlet 18 is fixedly connected to the outer surface of the tank body 1. When the fan is working, air is sucked in from the air inlet 19 and discharged from the air outlet 18 after being processed by the fan.

[0035] Working principle:

[0036] When in use, the impeller 20 is first placed inside the first groove 9, so that the second groove 10 corresponds to the first through hole 12, the bolts fixed between the turntable 13 and the impeller 8 are removed, the turntable 13 is rotated, so that the position of the second through hole 14 corresponds to the second groove 10, and the fixing pin 17 is inserted into the second groove 10. After the fixing pin 17 is inserted, the turntable 13 is rotated so that the mounting block 15 and the third groove 11 are in the same position, and then the mounting block 15 is fixed to the surface of the impeller 8 by bolts, and the impeller 20 is installed. When it is necessary to remove the impeller 20, the bolts fixed between the turntable 13 and the impeller 8 are removed, and the turntable 13 is rotated so that the position of the second through hole 14 corresponds to the second groove 10. At this time, under the action of the spring 16 at the bottom of the second groove 10, the fixing pin 17 will pop outward for a distance, and the fixing pin 17 can be pulled out, and then the impeller 20 can be removed from the impeller 8.

[0037] In the description of the present invention, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inside", "outside", "back", "middle", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0038] However, what is described above is only a specific embodiment of the present invention and should not be used to limit the scope of implementation of the present invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the patent of the present invention should still fall within the scope covered by the claims of the present invention.

Claims

1. A multi-stage centrifugal fan, comprising a tank body (1), characterized in that: A placement plate (2) is arranged below the tank body (1), the tank body (1) and the placement plate (2) are fixedly connected via a first connecting platform (3), a second connecting platform (4) is fixedly mounted on the upper surface of the placement plate (2), a motor (5) is fixedly connected to the top of the second connecting platform (4), a rotating shaft (6) is fixedly connected to the output end of the motor (5), a mounting shell (7) is fixedly sleeved on the outer surface of the rotating shaft (6), an impeller (8) is fixedly connected to the outer surface of the mounting shell (7), a plurality of impellers (8) are provided on the outer surface of the impeller (8), a plurality of first grooves (9) are provided on the outer surface of the impeller (8), a second groove (10) is provided on the top of the impeller (8), and a plurality of second grooves ( The number of the impeller (8) is multiple, the top of the impeller (8) is also provided with a third groove (11), the number of the third grooves (11) is also multiple, the bottoms of the multiple second grooves (10) are fixedly connected with springs (16), the interior of the second groove (10) is also provided with a fixing pin (17), the spring (16) is located on the right side of the fixing pin (17), the interior of the first groove (9) is provided with a wheel blade (20), the interior of the wheel blade (20) is provided with a first through hole (12), the number of the first through hole (12) is multiple, the left surface of the impeller (8) is movably mounted with a rotating disk (13), the left side surface of the rotating disk (13) is provided with a second through hole (14), the number of the second through hole (14) is multiple.

2. A multi-stage centrifugal fan according to claim 1, characterized in that: The second connecting platform (4) is located on the right side of the first connecting platform (3), and the fixing pin (17) is located inside the first through hole (12).

3. A multi-stage centrifugal fan according to claim 1, characterized in that: The impeller (8) is movably connected to the tank body (1), and the first through hole (12) and the second groove (10) have the same cross-sectional shape.

4. A multi-stage centrifugal fan according to claim 1, characterized in that: The cross-sectional shape of the second through hole (14) is the same as that of the first through hole (12), and the cross-sectional shape of the second through hole (14) is the same as that of the fixing pin (17).

5. The multi-stage centrifugal fan according to claim 1, characterized in that: A mounting block (15) is fixedly connected to the outer surface of the rotating disk (13), and the mounting block (15) is fixedly connected to the third groove (11) via bolts.

6. A multi-stage centrifugal fan according to claim 1, characterized in that: An air inlet (19) is fixedly mounted on the left side surface of the tank body (1), and an air outlet (18) is fixedly connected to the outer surface of the tank body (1).

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