Coated energy-saving and noise-reducing multistage centrifugal fan

Abstract

The invention provides a coated energy-saving noise-reducing multistage centrifugal fan, and relates to the technical field of centrifugal fans. The centrifugal fan comprises a bottom plate, a plurality of spring supporting legs are fixedly connected to the four corners of the top end of the bottom plate at equal intervals, a fixing base is fixedly connected to the top ends of the spring supporting legs, the number of the spring supporting legs is four, and two threaded rods are rotationally connected to the inner wall of the fixing base in a limiting mode; and one ends of the outer walls of the two threaded rods are fixedly connected with transmission wheels, two driving rods penetrate through one side of the outer wall of the fixing base, one ends of the two driving rods are fixedly connected with the transmission wheels, and the multiple transmission wheels are in transmission connection through a transmission belt. According to the centrifugal fan, noise generated by fan operation is better reduced, the problem that the fan operation noise is large is solved, and the centrifugal fan further has the functions of filtering dust in conveyed air and improving the air conveying quality.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal fans, and in particular to a wrapped energy-saving and noise-reducing multi-stage centrifugal fan. Background Art

[0002] Multi-stage centrifugal fan is a ventilation device that works in series with multiple impellers, mainly used for blowing and compressing air. Its working principle is to generate centrifugal force through the rotation of the impeller, accelerate the gas and compress or suck it to the desired position. The gas enters from the air inlet, is accelerated and compressed by the impeller, and finally the kinetic energy of the gas is converted into static pressure energy through the diffuser to achieve gas compression or suction. It has the advantages of using multi-stage impellers to work in series, which makes the energy loss smaller and improves the overall efficiency of the fan. It has high pressure and large air volume, and can generate higher wind pressure and larger air volume to meet the needs of various process flows. Each impeller is independent of each other, and the vibration generated during operation is small, and the overall operation is more stable. It is widely used in various industrial fields, such as smelting blast furnaces, coal washing plants, mine flotation, sewage treatment, chemical gasification and other occasions where air needs to be transported. It can also be used to transport other special gases.

[0003] However, the existing centrifugal fans, because of the use of multiple impellers, often cause a lot of noise due to the strong wind force, and because sometimes they need to be used in places such as coal washing plants and mine blast furnace smelting, they will cause a lot of dust to be generated during internal operation, affecting the air delivery quality. Therefore, those skilled in the art provide a wrapped energy-saving and noise-reducing multi-stage centrifugal fan to solve the problems raised in the above background technology. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the shortcomings of the prior art, the present invention provides an enclosed energy-saving and noise-reducing multi-stage centrifugal fan, which can better reduce the noise generated by the operation of the fan, solve the problem of high noise during fan operation, and also has the function of filtering dust inside the transmitted air to improve the air delivery quality.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a wrapped energy-saving and noise-reducing multi-stage centrifugal fan, comprising a bottom plate, a plurality of spring feet are fixedly connected at equal intervals at the four corners of the top of the bottom plate, a fixed base is fixedly connected to the top of the plurality of spring feet, and the number of the plurality of spring feet is four, the inner wall of the fixed seat is limitedly rotatably connected to two threaded rods, one end of the outer wall of the two threaded rods is fixedly connected to a transmission wheel, one side of the outer wall of the fixed seat passes through two driving rods, one end of the two driving rods is fixedly connected to a transmission wheel, the plurality of transmission wheels are connected through a transmission belt, the outer walls of the two threaded rods are threadedly connected to a clamping frame, and one side of the two clamping frames is provided with an anti-slip groove;

[0008] A box body is provided at the top of the fixed base, the box body is located between the two clamping frames, an air port is fixedly connected to one side of the outer wall of the box body, and a filter box is fixedly connected to the top of the box body;

[0009] Through the above technical solution, two driving rods are set to rotate, thereby driving the transmission wheel to rotate along with the driving rods, so that the transmission wheel drives the transmission belt, so that the transmission wheel fixed on the threaded rod can rotate along with the transmission belt, so that the two clamping frames threadedly connected on the threaded rod can move relative to each other, thereby driving the two anti-slip grooves to clamp and fix the box body, making the box body more firmly fixed.

[0010] Preferably, the inner wall of the box body is fixedly connected to the inner box, a hollow groove is opened at the center of the inner wall of the inner box, a driving motor is fixedly connected to one side of the inner wall of the hollow groove, the output end of the driving motor is fixedly connected to the first fan blade, the end of the output end of the driving motor away from the first fan blade penetrates the second fan blade, and the end of the output end of the driving motor away from the second fan blade is fixedly connected to the limit head;

[0011] Through the above technical solution, the output end of the driving motor is set to drive the first blade and the second blade to rotate, so that the energy loss is small, the overall efficiency of the fan is improved, and the fan blades will not be dislocated by the limit head.

[0012] Preferably, one side of the limit head is fixedly connected to an air guide plate, the side of the air guide plate away from the limit head is fixedly connected to an extension section, the side of the extension section away from the air guide plate is fixedly connected to a chassis, and one side of the chassis is fixed to one side of the drive motor;

[0013] Through the above technical solution, by setting up an air guide plate, outside air can enter the device, by setting up an extension section, the first fan blade and the second fan blade can be wrapped and rotated, and by setting up a chassis, wind can be transmitted through the air outlet fixed on one side of the chassis.

[0014] Preferably, an air outlet is fixedly connected to one side of the chassis, a transmission pipe is fixedly connected to one side of the air outlet, and an air guide pipe is fixedly connected to one side of the outer wall of the transmission pipe;

[0015] Through the above technical solution, by setting the air outlet, the controlled ball entering the device can be transmitted to the transmission pipe through the air outlet.

[0016] Preferably, the outer wall of the inner box is fixedly connected with wind guide pipes at both sides, one side of the two wind guide pipes is fixedly connected with a guide pipe, and the other side of the wind guide pipe at one side is fixedly connected with an air guide pipe;

[0017] Through the above technical solution, the air entering the transmission pipe is transmitted into the sealed cavity through the air guide pipe fixedly connected to one side of the transmission pipe, and is conducted through the sealed cavity to introduce the transmitted air into the wind guide pipe, and the air is transmitted into the wind guide pipe on the other side through the guide pipe on one side of the outer wall of the wind guide pipe for discharge.

[0018] Preferably, the outer wall of the inner box is fixedly connected with a plurality of sealing layers, the number of the plurality of sealing layers is three, and a sealed cavity is formed between the plurality of sealing layers and the box body, an air guide tube penetrates one side of the two sealing layers at the middle position, and a plurality of noise reduction tubes are fixedly connected to one side of the plurality of sealing layers;

[0019] Through the above technical solution, by setting the sealing layer, multiple sealing layers can form a sealed cavity with the box body, and the airflow is slowed down and noise is reduced through multiple noise reduction pipes in the sealed cavity, thereby reducing the sound generated by the airflow.

[0020] Preferably, a plurality of purification pipes are fixedly connected to one side of the inner bottom end surface of the filter box, the bottom ends of the plurality of purification pipes pass through one side of the top end of the box body, and the outer walls of the plurality of purification pipes are fixedly connected to a fixed frame, the top ends of the plurality of purification pipes are fixedly connected to an expansion pipe, and one side of the outer wall of the expansion pipe is fixedly connected to a pressure-conducting pipe;

[0021] Through the above technical solution, by setting up multiple purification pipes, the airflow can pass through multiple internal dust blocking layers inside the purification pipes to block large particles of dust, and the purified air is transmitted to the pressure pipe through the expansion pipe for secondary purification.

[0022] Preferably, the bottom end of the pressure-guiding pipe is fixedly connected with a plurality of filter ports, the bottom ends of the plurality of filter ports are fixedly connected with a dust collecting seat, a notch is provided at the top of the dust collecting seat and one side of the dust collecting seat is fixedly connected with a fixed frame;

[0023] Through the above technical solution, by providing a dust collecting seat and a filter port, the air that needs secondary purification can be transmitted to the dust collecting seat through the filter port, and the dust is collected by the dust collecting seat.

[0024] Preferably, the inner walls of the plurality of purification tubes are fixedly connected with an internal dust barrier layer, and the dust barrier layer is made of rubber, the top ends of the plurality of purification tubes are fixedly connected with connecting ports, and the top ends of the plurality of connecting ports are fixedly connected to the bottom end of the expansion tube.

[0025] Through the above technical solution, by providing a connecting port, a plurality of purification pipes can be connected to the pressure guiding pipe.

[0026] Preferably, a purified gas outlet is fixedly connected to the top of the filter box.

[0027] Through the above technical solution, by setting the purified air outlet, the purified air can be transmitted out of the device.

[0028] Working principle: The wrapped energy-saving and noise-reducing multi-stage centrifugal fan is provided with two driving rods that rotate, thereby driving the transmission wheel to rotate along with the driving rods, so that the transmission wheel drives the transmission belt, so that the transmission wheel fixed on the threaded rod can rotate along with the transmission belt, so that the two clamping frames threaded on the threaded rod can move relative to each other, thereby driving the two anti-slip grooves to clamp and fix the box body, making the box body more firmly fixed, and the output end of the driving motor is provided to drive the first blade and the second blade to rotate, so that the energy loss is small and the overall efficiency of the fan is improved. The limit head prevents the blades from being deviated, and the wind guide plate is provided to allow outside air to enter the device. The extension section is provided so that the first blade and the second blade can be wrapped and rotated, and the chassis is provided so that the wind can be carried out through the air outlet fixed on one side of the chassis. Transmission, the air entering the transmission pipe is transmitted into the sealed cavity through the air guide pipe fixedly connected to one side of the transmission pipe, and is conducted through the sealed cavity to introduce the transmitted air into the wind guide pipe, and the air is transmitted into the wind guide pipe on the other side through the guide pipe on the outer wall of the wind guide pipe for discharge, and by setting a sealing layer, multiple sealing layers are able to form a sealed cavity with the box body, and the airflow is slowed down and noise-reduced by multiple noise reduction pipes in the sealed cavity to reduce the sound generated by the airflow operation, so that the airflow can pass through the multiple internal dust-blocking layers inside the purification pipe to block large particles of dust, and the purified air is transmitted to the pressure guide pipe for secondary purification through the expansion pipe, and by setting a dust collecting seat and a filter port, the air that needs secondary purification can be transmitted to the dust collecting seat through the filter port, and the dust is collected by the dust collecting seat, and by setting a purified air outlet, the purified air can be transmitted out of the device.

[0029] (III) Beneficial effects

[0030] The present invention provides a wrapped energy-saving and noise-reducing multi-stage centrifugal fan. It has the following beneficial effects:

[0031] 1. The present invention provides an enclosed energy-saving and noise-reducing multi-stage centrifugal fan, which drives a transmission wheel to rotate along with the driving rod by setting two driving rods to rotate, so that the transmission wheel drives a transmission belt, so that the transmission wheel fixed on the threaded rod can rotate along with the transmission belt, so that two clamping frames threadedly connected on the threaded rod can move relative to each other, thereby driving two anti-slip grooves to clamp and fix the box body, so that the box body is fixed more firmly.

[0032] 2. The present invention provides an enclosed energy-saving and noise-reducing multi-stage centrifugal fan, so that the air entering the transmission pipe is transmitted into the sealed cavity through the air guide pipe fixedly connected to one side of the transmission pipe, and the transmitted air is introduced into the wind guide pipe through the sealed cavity. The air is transmitted into the wind guide pipe on the other side through the guide pipe on the outer wall of the wind guide pipe for discharge. By arranging a sealing layer, multiple sealing layers can form a sealed cavity with the box body, and the airflow is slowed down and noise-reduced by multiple noise reduction pipes in the sealed cavity, thereby reducing the sound generated by the airflow operation.

[0033] 3. The present invention provides an encapsulated energy-saving and noise-reducing multi-stage centrifugal fan, which enables the airflow to pass through multiple internal dust-blocking layers inside the purification tube to block large particles of dust, and transmit the purified air to the pressure-conducting tube through the expansion tube for secondary purification. By setting a dust collecting seat and a filter port, the air that needs secondary purification can be transmitted to the dust collecting seat through the filter port, and the dust is collected by the dust collecting seat. By setting a purified air outlet, the purified air can be transmitted out of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is an axonometric diagram of the present invention;

[0035] Figure 2 This is a schematic diagram of the internal structure of the fixed base of the present invention;

[0036] Figure 3 It is a schematic diagram of the internal structure of the present invention;

[0037] Figure 4 This is a schematic diagram of the noise reduction pipe connection structure of the present invention;

[0038] Figure 5 This is a schematic diagram of the connection structure of the drive motor of the present invention;

[0039] Figure 6 This is a schematic diagram of the wind power guide pipe connection structure of the present invention;

[0040] Figure 7 This is a schematic diagram of the internal structure of the extension section of the present invention;

[0041] Figure 8 This is a schematic diagram of the pressure guiding pipe connection structure of the present invention;

[0042] Fig. 9 It is a schematic diagram of the internal structure of the purification tube of the present invention.

[0043] Among them, 1. bottom plate; 2. spring support foot; 3. fixed base; 4. threaded rod; 5. drive rod; 6. transmission wheel; 7. transmission belt; 8. clamping frame; 9. anti-skid groove; 10. box body; 11. air port; 12. filter box; 13. inner box; 14. air guide plate; 15. extension section; 16. chassis; 17. drive motor; 18. air outlet; 19. first fan blade; 20. second fan blade; 21. limit head; 22. empty slot; 23. sealing layer; 24. sealing cavity; 25. air guide pipe; 26. noise reduction pipe; 27. guide pipe; 28. wind guide pipe; 29. ​​transmission pipe; 30. purification pipe; 31. fixed frame; 32. expansion pipe; 33. pressure pipe; 34. filter port; 35. dust collecting seat; 36. notch; 37. purified air outlet; 38. internal dust barrier layer; 39. connection port. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In the description of this application, it should be noted that the terms used here are only for describing specific implementations, and are not intended to limit the exemplary implementations according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and devices known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and devices should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0045] Embodiment 1:

[0046] like Figure 1-9As shown, the embodiment of the present invention provides a wrapped energy-saving and noise-reducing multi-stage centrifugal fan, including a bottom plate 1, a plurality of spring legs 2 are fixedly connected at equal intervals at the four corners of the top of the bottom plate 1, a fixed base 3 is fixedly connected to the top of the plurality of spring legs 2, and the number of the plurality of spring legs 2 is four, the inner wall of the fixed base 3 is limitedly rotatably connected to two threaded rods 4, one end of the outer wall of the two threaded rods 4 is fixedly connected to a transmission wheel 6, one side of the outer wall of the fixed base 3 is penetrated by two driving rods 5, one end of the two driving rods 5 is fixedly connected to the transmission wheel 6, and the plurality of transmission wheels 6 are connected through a transmission belt 7, the outer walls of the two threaded rods 4 are threadedly connected to a clamping frame 8, and one side of the two clamping frames 8 is provided with an anti-slip groove 9;

[0047] A box body 100 is provided at the top of the fixed base 3, and the box body 100 is located between the two clamping frames 8. An air port 11 is fixedly connected to one side of the outer wall of the box body 100, and a filter box 12 is fixedly connected to the top of the box body 100. By setting two driving rods 5 to rotate, the transmission wheel 6 is driven to rotate along with the driving rod 5, so that the transmission wheel 6 drives the transmission belt 7, so that the transmission wheel 6 fixed on the threaded rod 4 can be driven to rotate along with the transmission belt 7, so that the two clamping frames 8 threadedly connected on the threaded rod 4 can move relative to each other, thereby driving the two anti-slip grooves 9 to clamp and fix the box body 10, so that the box body 10 is fixed more firmly.

[0048] Embodiment 2: The inner wall of the box body 10 is fixedly connected with the inner box 13, and a hollow groove 22 is opened at the center of the inner wall of the inner box 13. A driving motor 17 is fixedly connected to one side of the inner wall of the hollow groove 22. The output end of the driving motor 17 is fixedly connected with the first fan blade 19. The end of the output end of the driving motor 17 away from the first fan blade 19 is penetrated by the second fan blade 20. The end of the output end of the driving motor 17 away from the second fan blade 20 is fixedly connected to the limiting head 21. By setting the output end of the driving motor 17 to drive the first fan blade 19 and the second fan blade 20 to rotate, the energy loss is small, and the overall efficiency of the fan is improved. The fan blade will not be deviated by the limiting head 21. One side of the limiting head 21 is fixedly connected with the air guide plate 14, and the air guide plate 14 is away from the limiting head One side of the head 21 is fixedly connected with an extension section 15, and the side of the extension section 15 away from the air guide plate 14 is fixedly connected with a chassis 16, and one side of the chassis 16 is fixed to one side of the driving motor 17. By setting the air guide plate 14, outside air can enter the device, and by setting the extension section 15, the first fan blade 19 and the second fan blade 20 can be wrapped and rotated. By setting the chassis 16, the wind can be transmitted through the air outlet 18 fixed on one side of the chassis 16, and the air outlet 18 is fixedly connected to one side of the chassis 16. A transmission pipe 29 is fixedly connected to one side of the air outlet 18, and an air guide pipe 25 is fixedly connected to one side of the outer wall of the transmission pipe 29. By setting the air outlet 18, the ball entering the device can be transmitted to the In the transmission pipe 29, the outer wall of the inner box 13 is fixedly connected with wind guide pipes 28 at both sides, one side of the two wind guide pipes 28 is fixedly connected with a guide pipe 27, and one side of the wind guide pipe 28 on one side is fixedly connected with an air guide pipe 25. The air entering the transmission pipe 29 is transmitted into the sealed cavity 24 through the air guide pipe 25 fixedly connected to one side of the transmission pipe 29, and is conducted through the sealed cavity 24 to introduce the transmitted air into the wind guide pipe 28. The air is transmitted into the wind guide pipe 28 on the other side through the guide pipe 27 on one side of the outer wall of the wind guide pipe 28 for discharge. The outer wall of the inner box 13 is fixedly connected with a plurality of sealing layers 23, the number of the plurality of sealing layers 23 is three, and a sealed cavity 2 is formed between the plurality of sealing layers 23 and the box body 10. 4. An air guide tube 25 penetrates one side of the two sealing layers 23 near the middle, and a plurality of noise reduction tubes 26 are fixedly connected to one side of the plurality of sealing layers 23. By setting the sealing layers 23, the plurality of sealing layers 23 and the box body 10 form a sealed cavity 24. The plurality of noise reduction tubes 26 in the sealed cavity 24 slow down and reduce the noise of the airflow, thereby reducing the sound generated by the airflow operation. A plurality of purification tubes 30 are fixedly connected to one side of the inner bottom end surface of the filter box 12, and the bottom ends of the plurality of purification tubes 30 penetrate one side of the top end of the box body 10, and the outer walls of the plurality of purification tubes 30 are fixedly connected to a fixed frame 31, and the top ends of the plurality of purification tubes 30 are fixedly connected to an expansion tube 32, and the outer wall side of the expansion tube 32 is fixedly connected to a pressure guide tube 33. By setting the plurality of purification tubes 30,The airflow passes through the multiple internal dust blocking layers 38 inside the purification tube 30 to block large particles of dust, and the purified air is transmitted to the pressure pipe 33 through the expansion tube 32 for secondary purification. The bottom end of the pressure pipe 33 is fixedly connected with multiple filter ports 34, and the bottom ends of the multiple filter ports 34 are fixedly connected with a dust collecting seat 35. The top of the dust collecting seat 35 is provided with a notch 36, and one side of the dust collecting seat 35 is fixedly connected to the fixed frame 31. By setting the dust collecting seat 35 and the filter port 34, the air that needs secondary purification can pass through the filter port 34. The dust is transmitted to the dust collecting seat 35, and the dust is collected by the dust collecting seat 35. The inner wall of the multiple purification pipes 30 is fixedly connected with an internal dust blocking layer 38, and the internal dust blocking layer 38 is made of rubber. The top of the multiple purification pipes 30 is fixedly connected with a connection port 39, and the top of the multiple connection ports 39 is fixedly connected to the bottom of the expansion pipe 32. By setting the connection port 39, the multiple purification pipes 30 can be connected to the pressure pipe 33. The top of the filter box 12 is fixedly connected with a purified air outlet 37. By setting the purified air outlet 37, the purified air can be transmitted out of the device.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wrapped energy-saving and noise-reducing multi-stage centrifugal fan, comprising a bottom plate (1), characterized in that: A plurality of spring legs (2) are fixedly connected at equal intervals at the four corners of the top of the bottom plate (1); the tops of the plurality of spring legs (2) are fixedly connected to a fixed base (3); and the number of the plurality of spring legs (2) is four; the inner wall of the fixed base (3) is connected to two threaded rods (4) for limited rotation; one end of the outer wall of the two threaded rods (4) is fixedly connected to a transmission wheel (6); one side of the outer wall of the fixed base (3) is penetrated by two driving rods (5); one end of the two driving rods (5) is fixedly connected to a transmission wheel (6); the plurality of transmission wheels (6) are connected in transmission via a transmission belt (7); the outer walls of the two threaded rods (4) are threadedly connected to a clamping frame (8); one side of the two clamping frames (8) is provided with an anti-slip groove (9); A box body (10) is provided at the top of the fixed base (3), and the box body (10) is located between two clamping frames (8). An air port (11) is fixedly connected to one side of the outer wall of the box body (10), and a filter box (12) is fixedly connected to the top of the box body (10).

2. The encapsulated energy-saving and noise-reducing multi-stage centrifugal fan according to claim 1, characterized in that: The inner wall of the box body (10) is fixedly connected to an inner box (13); a hollow groove (22) is provided at the center of the inner wall of the inner box (13); a driving motor (17) is fixedly connected to one side of the inner wall of the hollow groove (22); an output end of the driving motor (17) is fixedly connected to a first fan blade (19); an end of the output end of the driving motor (17) away from the first fan blade (19) is penetrated by a second fan blade (20); and an end of the output end of the driving motor (17) away from the second fan blade (20) is fixedly connected to a limit head (21).

3. The encapsulated energy-saving and noise-reducing multi-stage centrifugal fan according to claim 2 is characterized in that: One side of the limit head (21) is fixedly connected to an air guide plate (14), a side of the air guide plate (14) away from the limit head (21) is fixedly connected to an extension section (15), a side of the extension section (15) away from the air guide plate (14) is fixedly connected to a chassis (16), and one side of the chassis (16) is fixed to one side of a drive motor (17).

4. The encapsulated energy-saving and noise-reducing multi-stage centrifugal fan according to claim 3 is characterized in that: An air outlet (18) is fixedly connected to one side of the chassis (16), a transmission pipe (29) is fixedly connected to one side of the air outlet (18), and an air guide pipe (25) is fixedly connected to one side of the outer wall of the transmission pipe (29).

5. The encapsulated energy-saving and noise-reducing multi-stage centrifugal fan according to claim 2 is characterized in that: Wind guide tubes (28) are fixedly connected to the outer wall of the inner box (13) at both sides, one side of the two wind guide tubes (28) is fixedly connected to a guide tube (27), and one side of the wind guide tube (28) at one side is fixedly connected to an air guide tube (25).

6. The encapsulated energy-saving and noise-reducing multi-stage centrifugal fan according to claim 2, characterized in that: The outer wall of the inner box (13) is fixedly connected with a plurality of sealing layers (23), the number of the plurality of sealing layers (23) is three, and a sealed cavity (24) is formed between the plurality of sealing layers (23) and the box body (10), an air guide tube (25) penetrates one side of the two sealing layers (23) at the middle position, and a plurality of noise reduction tubes (26) are fixedly connected to one side of the plurality of sealing layers (23).

7. The encapsulated energy-saving and noise-reducing multi-stage centrifugal fan according to claim 1, characterized in that: A plurality of purification pipes (30) are fixedly connected to one side of the inner bottom end surface of the filter box (12); the bottom ends of the plurality of purification pipes (30) penetrate through one side of the top end of the box body (10); the outer walls of the plurality of purification pipes (30) are fixedly connected to a fixed frame (31); the top ends of the plurality of purification pipes (30) are fixedly connected to an expansion pipe (32); and the outer wall of the expansion pipe (32) is fixedly connected to one side of a pressure-conducting pipe (33).

8. The encapsulated energy-saving and noise-reducing multi-stage centrifugal fan according to claim 7, characterized in that: The bottom end of the pressure-conducting pipe (33) is fixedly connected to a plurality of filter ports (34), and the bottom ends of the plurality of filter ports (34) are fixedly connected to a dust collecting seat (35). A notch (36) is provided at the top end of the dust collecting seat (35), and one side of the dust collecting seat (35) is fixedly connected to a fixed frame (31).

9. The encapsulated energy-saving and noise-reducing multi-stage centrifugal fan according to claim 7, characterized in that: The inner walls of the plurality of purification tubes (30) are fixedly connected with an internal dust barrier layer (38), and the internal dust barrier layer (38) is made of rubber. The top ends of the plurality of purification tubes (30) are fixedly connected with a connecting port (39), and the top ends of the plurality of connecting ports (39) are fixedly connected to the bottom end of the expansion tube (32).

10. The encapsulated energy-saving and noise-reducing multi-stage centrifugal fan according to claim 1, characterized in that: The top end of the filter box (12) is fixedly connected with a purified gas outlet (37).

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