Modular multi-duct environmental centrifugal fan

Abstract

The application relates to a modular multi-air-duct environment-friendly centrifugal fan in the field of ventilation equipment, which is characterized in that an outer heat exchange cylinder fixedly connected with a centrifugal impeller is arranged outside a bearing, the outer heat exchange cylinder absorbing heat of the bearing is fully sprayed by airflow entering a volute, heat exchange and heat dissipation of the bearing are realized, meanwhile, an inner heat exchange cylinder fixedly sleeved with a motor is arranged inside the bearing, synchronous heat dissipation of the motor and the bearing is realized, accumulation of heat on the casing of the motor and the bearing is reduced, wear of the motor and the bearing is reduced, energy consumption of the motor is reduced, furthermore, the bearing ball and lubricating oil filled in the bearing ball cavity continuously stir the lubricating oil in the bearing ball cavity, heat transfer effect of the bearing is improved, in addition, the heat collecting cylinder filled with phase change materials is arranged in the inner heat exchange cylinder, heat collection of the bearing and the motor is accelerated, and accumulation of heat on the casing of the bearing and the motor is reduced.

Description

Technical Field

[0001] The present invention relates to a fan, and in particular to a modular multi-duct environmentally friendly centrifugal fan applied in the field of ventilation equipment. Background Art

[0002] A centrifugal fan is an important pneumatic device. It accelerates air through a high-speed rotating impeller, then decelerates and redirects the air, converting kinetic energy into pressure energy to provide fresh air, expel stale air, and maintain indoor air quality. Centrifugal fans primarily consist of a casing, air inlet, rotor assembly, and bearing housing. They are widely used in industrial production and environmental protection, meeting requirements for material conveying, dust extraction, and exhaust gas treatment, purifying the air and reducing environmental pollution. Existing centrifugal fans for ventilation require long periods of operation. When the motor or impeller bearings continue to heat up due to long-term operation, the motor power decreases and the bearings wear more severely, further increasing the motor's power consumption.

[0003] The existing patent with publication number CN114962302B discloses an energy-saving and environmentally friendly centrifugal fan, including: a shell, which is constructed to have a flow channel for guiding airflow; a fan, which is used to disturb the airflow so that the airflow flows along the flow channel; a motor, which is used to drive the fan to rotate relative to the shell around a pivot axis; the fan includes: a blade portion, which includes a plurality of centrifugal blades to generate a centrifugal airflow away from the pivot axis; a guide portion, which changes the direction of the airflow parallel to the pivot axis so that the airflow flows into between the two centrifugal blades at least in a direction obliquely intersecting with the pivot axis; wherein, a plurality of chambers are provided on the guide portion, and the chambers are filled with phase change material so that when the phase change material undergoes a phase change reaction, the guide portion has a temperature field that promotes the airflow to flow into the blade portion; the present invention can ensure the temperature difference between the air inlet and the outside world and reduce the energy loss of the centrifugal fan.

[0004] The above-mentioned existing patent forms a temperature field at the air inlet by using a guide part filled with phase change material, thereby reducing the increase in motor power consumption when the temperature rise affects the air flow, but it does not solve the problem of increased energy consumption caused by overheating and increased wear of the bearings due to long-term operation. Summary of the Invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the bearings of the existing centrifugal fans are prone to overheating and wear during long-term operation, which causes increased energy consumption of the fan.

[0006] To solve the above problems, the present invention provides a modular multi-duct environmentally friendly centrifugal fan, comprising a volute, a front cover plate fixedly connected to the front end of the volute, an air inlet opened at the center of the front cover plate, a centrifugal impeller arranged in the volute, the centrifugal impeller comprising a front disc and a rear disc and a first blade arranged between the two and fixedly connected to the two, an outer heat exchange cylinder fixedly connected to the rear disc is provided on the inner side of the first blade, the outer heat exchange cylinder is fixedly connected to the output shaft of the motor, a front opening arranged opposite to the air inlet is opened on the front disc, and an air outlet pipe is fixedly connected to the outer circumferential wall of the volute;

[0007] An inner heat exchange tube is fixedly sleeved on the outside of the motor, and the inner heat exchange tube is fixedly connected to the inner wall of the volute away from the air inlet. The inner heat exchange tube and the outer heat exchange tube are rotatably connected via a bearing. The bearing includes an outer ring cover and an inner ring cover that are rotatably connected. The outer ring cover and the inner ring cover enclose a closed ball cavity, and the ball cavity is filled with evenly distributed balls and lubricating oil. The outer ring cover is fixedly connected to the inner wall of the outer heat exchange tube, and the inner ring cover is fixedly connected to the outer wall of the inner heat exchange tube.

[0008] A guide tube fixedly connected to the inner wall of the front disk is provided on the outside of the outer heat exchange tube. An annular flow cavity for air flow is formed between the front disk, the guide tube and the outer heat exchange tube. An annular flow gap connected to the annular flow cavity is formed between the guide tube and the rear disk. A second blade is fixedly connected to the outer circumferential wall of the outer heat exchange tube.

[0009] In the above modular multi-duct environmentally friendly centrifugal fan, the airflow flowing through the centrifugal impeller is used through the guide tube and the external heat exchange tube to continuously exchange heat and dissipate heat for the bearing.

[0010] As a further improvement of the present application, an inner heat exchange cavity is opened in the shell wall of the inner heat exchange cylinder, and the inner heat exchange cavity is connected to the ball cavity through multiple pairs of first connecting tubes and second connecting tubes located on both sides of the bearing, and both the first connecting tubes and the second connecting tubes are fixedly connected to the side wall of the inner ring cover.

[0011] As a further improvement of the present application, a heat collecting tube is installed in the inner heat exchange cavity. The heat collecting tube is filled with phase change material. The heat collecting tube is an annular hollow tube. The heat collecting tube is fixedly connected to the inner wall of the inner heat exchange cavity through a fixed column.

[0012] As a further improvement of the present application, an inner ring plate is slidably connected inside the heat collecting tube, and the inner ring plate is fixedly connected to multiple transverse rods extending into the inner heat exchange cavity, and the transverse rods are fixedly connected to an outer ring plate that slides against the inner wall of the inner heat exchange cavity, and the phase change material filled in the heat collecting tube is a solid-gas phase change material.

[0013] As a further improvement of the present application, both the front disc and the rear disc are disc-shaped structures, the rear disc is provided with a rear opening arranged opposite to the front opening, and the outer heat exchange tube is fixedly connected to the inner wall of the rear opening.

[0014] As a further improvement of the present application, both the outer heat exchange tube and the inner heat exchange tube are cylindrical structures, and both are made of heat-conducting material, which is one of aluminum oxide and aluminum nitride.

[0015] As a further improvement of the present application, there are multiple air outlet pipes and they are equidistantly distributed on the circumferential side wall of the volute. A closing valve is provided at the opening of the outer end of the air outlet pipe. The closing valve includes an air outlet plate fixedly connected to the inner wall of the air outlet pipe. A plurality of air outlet holes are provided on the air outlet plate. The air outlet plate is slidably connected to a valve core disk arranged opposite to the air outlet holes. The valve core disk sleeve is provided with a spring abutting against the air outlet plate. An air outlet kit is threadedly connected to the outer end of the air outlet pipe. The air outlet kit includes an outer sleeve threadedly connected to the air outlet pipe. A radial rod is fixedly connected inside the outer sleeve. An axial rod arranged opposite to the valve core disk is fixedly connected to the radial rod.

[0016] As a further improvement of the present application, the outer ring cover is fixedly connected to a plurality of external heat exchange tubes extending to the outside of the outer heat exchange tube, the external heat exchange tubes are connected to the ball cavity, and the external heat exchange tubes are located between adjacent second blades.

[0017] In summary, the present invention is provided with an outer heat exchange tube fixedly nested in the centrifugal impeller and a guide tube arranged on the outside thereof, so that the air flow entering the volute is fully sprayed on the surface of the outer heat exchange tube, thereby taking away the heat on the outer heat exchange tube; at the same time, through the inner heat exchange tube arranged on the outside of the motor and the bearings arranged between the outer heat exchange tube and the inner heat exchange tube, after the inner heat exchange tube absorbs the heat of the motor, the heat is transferred to the outer heat exchange tube through the bearing, thereby realizing synchronous heat dissipation of the motor and the bearing, reducing the accumulation of heat on the housings of the motor and the bearing, thereby reducing the wear of the motor and the bearing, and realizing the reduction of motor energy consumption; in addition, by enclosing the outer ring cover and the inner ring cover with a ball cavity, when the bearing transfers heat, the balls continuously stir the lubricating oil in the ball cavity, increase the fluidity of the lubricating oil, thereby improving the heat transfer effect of the bearing; in addition, by the second blade arranged on the outer heat exchange tube, the first blade and the second blade are used to increase the flow velocity of the airflow in the centrifugal impeller, further improving the air output and heat dissipation effect of the centrifugal fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the three-dimensional structure of this application;

[0019] Figure 2 This is a schematic diagram of the longitudinal cross-sectional structure of the present application;

[0020] Figure 3 for Figure 2 Schematic diagram of the enlarged structure at A in the middle;

[0021] Figure 4 Schematic diagram of the airflow in the volute;

[0022] Figure 5 This is a schematic diagram of the exploded assembly of this application;

[0023] Figure 6 This is a schematic diagram of the exploded assembly of the outer heat exchange tube and the inner heat exchange tube in this application;

[0024] Figure 7 This is a schematic diagram of the exploded assembly of the inner heat exchange cylinder in this application;

[0025] Figure 8 This is a schematic diagram of the transverse cross-sectional structure of the present application;

[0026] Figure 9 for Figure 8 Schematic diagram of the enlarged structure at B in the middle;

[0027] Figure 10 Schematic diagram of the phase change material in the collector tube driving the flow of lubricating oil.

[0028] Description of the numbers in the figure:

[0029] 1. Volute; 2. Front cover; 201. Air inlet; 3. Air outlet duct; 4. Air outlet kit; 5. Centrifugal impeller; 6. Front disc; 601. Front opening; 7. First blade; 8. Rear disc; 801. Rear opening; 9. External heat exchange tube; 10. Motor; 11. Internal heat exchange tube; 1101. Internal heat exchange cavity; 12. Bearing; 1201. External ring cover; 1202. Internal ring cover; 1203. Ball bearing; 13. Guide tube; 14. Second blade; 15. External heat exchange tube; 16. First connecting tube; 17. Second connecting tube; 18. Collecting tube; 19. Fixing column; 20. Inner ring plate; 21. Transverse rod; 22. Outer ring plate; 23. Air outlet plate; 2301. Air outlet; 24. Valve core disc; 25. Spring; 26. Outer sleeve; 27. Radial rod; 28. Axial rod. DETAILED DESCRIPTION

[0030] The following describes two implementation methods of the present application in detail with reference to the accompanying drawings.

[0031] The first implementation method:

[0032] Figure 1-9 A modular multi-duct environmentally friendly centrifugal fan is shown, including a volute 1, a front cover plate 2 is fixedly connected to the front end of the volute 1, an air inlet 201 is opened at the center of the front cover plate 2, a centrifugal impeller 5 is provided in the volute 1, the centrifugal impeller includes a front disc 6 and a rear disc 8 and a first blade 7 arranged between the two and fixedly connected to the two, an outer heat exchange tube 9 is provided on the inner side of the first blade 7 and fixedly connected to the rear disc 8, and the outer heat exchange tube 9 is fixedly connected to the output shaft of the motor 10, a front opening 601 is opened on the front disc 6 and is arranged opposite to the air inlet 201, and an air outlet pipe 3 is fixedly connected to the outer wall of the volute 1;

[0033] For details, please refer to Figure 4 The output shaft of the motor 10 drives the outer heat exchange tube 9 to rotate, and the outer heat exchange tube 9 drives the centrifugal impeller 5 to rotate. The external airflow enters the centrifugal impeller 5 through the air inlet 201 and the front opening 601, and sprays the outer heat exchange tube 9;

[0034] See also Figure 3 , an inner heat exchange tube 11 is fixedly sleeved on the outside of the motor 10, and the inner heat exchange tube 11 is fixedly connected to the inner wall of the volute 1 away from the air inlet 201. The inner heat exchange tube 11 and the outer heat exchange tube 9 are rotatably connected through a bearing 12. The bearing 12 includes an outer ring cover 1201 and an inner ring cover 1202 that are rotatably connected. The outer ring cover 1201 and the inner ring cover 1202 enclose a closed ball cavity, and the ball cavity is filled with evenly distributed balls 1203 and lubricating oil. The outer ring cover 1201 is fixedly connected to the inner wall of the outer heat exchange tube 9, and the inner ring cover 1202 is fixedly connected to the outer wall of the inner heat exchange tube 11;

[0035] Specifically, the heat of the motor 10 is transferred to the bearing 12 through the inner heat exchange cylinder 11. The bearing 12 is filled with lubricating oil and balls. The lubricating oil and balls transfer the heat from the inner ring cover 1202 to the outer ring cover 1201. The outer ring cover 1201 transfers the heat to the outer heat exchange cylinder 9 in contact with it.

[0036] See also Figure 4 A guide tube 13 fixedly connected to the inner wall of the front disk 6 is provided on the outer side of the outer heat exchange tube 9. An annular flow cavity for air flow is formed between the front disk 6, the guide tube 13 and the outer heat exchange tube 9. An annular flow gap communicating with the annular flow cavity is formed between the guide tube 13 and the rear disk 8. A second blade 14 is fixedly connected to the outer wall of the outer heat exchange tube 9. The outer heat exchange tube 9 transfers heat to the second blade 14.

[0037] For details, please refer to Figure 4 The airflow after being sprayed onto the external heat exchange tube 9 flows through the annular flow gap under the action of the guide tube 13, then flows out from the annular flow gap to the outside of the guide tube 13, and then passes through the first blade 7 and is discharged to the air outlet pipe 3. In this process, the external heat exchange tube 9 drives the second blade 14 to rotate, so that the second blade 14 further accelerates the airflow entering the annular flow gap. At the same time, the external heat exchange tube 9 dissipates heat into the airflow through the second blade 14.

[0038] Compared with the traditional centrifugal fan, the present invention is provided with an outer heat exchange tube 9 fixedly nested in the centrifugal impeller 5 and a guide tube 13 arranged on the outside thereof, so that the airflow entering the volute 1 is fully sprayed on the surface of the outer heat exchange tube 9, thereby taking away the heat on the outer heat exchange tube 9; at the same time, through the inner heat exchange tube 11 arranged on the outside of the motor 10 and the bearing 12 arranged between the outer heat exchange tube 9 and the inner heat exchange tube 11, after the inner heat exchange tube 11 absorbs the heat of the motor 10, the heat is transferred to the outer heat exchange tube 9 through the bearing 12, thereby achieving synchronous heat dissipation of the motor 10 and the bearing 12, reducing the heat in the motor 10 and the bearing 12. The two are accumulated on the shell, thereby reducing the wear of the motor 10 and the bearing 12, and realizing the reduction of the energy consumption of the motor 10; in addition, the outer ring cover 1201 and the inner ring cover 1202 are enclosed to form a ball cavity, when the bearing 12 transfers heat, the ball 1203 continuously stirs the lubricating oil in the ball cavity, increases the fluidity of the lubricating oil, and thus improves the heat transfer effect of the bearing 12. In addition, by setting the second blade 14 on the outer heat exchange tube 9, the first blade 7 and the second blade 14 are used to increase the flow rate of the airflow in the centrifugal impeller 5, further improving the air output and heat dissipation effect of the centrifugal fan.

[0039] See also Figure 5 Both the front plate 6 and the rear plate 8 are disc-shaped structures. The rear plate 8 is provided with a rear opening 801 arranged opposite to the front opening 601 , and the outer heat exchange tube 9 is fixedly connected to the inner wall of the rear opening 801 .

[0040] Specifically, when the first blade 7 of the centrifugal impeller 5 rotates, it pushes the airflow entering the inner side thereof to be discharged centrifugally, so that the center position inside the centrifugal impeller 5 is in a negative pressure state, and then the airflow continuously enters the centrifugal impeller 5 to be sprayed to the external heat exchange cylinder 9 for heat dissipation.

[0041] It should be noted that the centrifugal impeller 5 is rotatably connected to the inner heat exchange tube 11 through the outer heat exchange tube 9 and the bearing 12. The inner heat exchange tube 11 is fixedly connected to the inner wall of the volute 1. The motor 10 is fixedly installed in the inner heat exchange tube 11, and the bearing 12 is in contact with the outer heat exchange tube 9. The airflow flowing through the volute 1 is used to spray heat to the outer heat exchange tube 9, thereby reducing the operating temperature of the bearing 12 and the motor 10, improving the operating efficiency of the motor 10, and saving energy consumption.

[0042] In this embodiment, both the outer heat exchange tube 9 and the inner heat exchange tube 11 are cylindrical structures, and both are made of a heat conductive material, which is one of aluminum oxide and aluminum nitride.

[0043] Specifically, aluminum oxide and aluminum nitride have good thermal conductivity and high strength, so that the outer heat exchange tube 9 has good stability and a long service life when the centrifugal impeller 5 rotates.

[0044] See also Figure 8 and Figure 9 The number of the air outlet pipes 3 is multiple and they are equidistantly distributed on the circumferential side wall of the volute 1. A closing valve is provided at the outer opening of the air outlet pipe 3. The closing valve includes an air outlet plate 23 fixedly connected to the inner wall of the air outlet pipe 3. A plurality of air outlet holes 2301 are opened on the air outlet plate 23. The air outlet plate 23 is slidably connected to a valve core disk 24 arranged opposite to the air outlet holes 2301. The valve core disk 24 is sleeved with a spring 25 abutting against the air outlet plate 23. The spring 25 enables the valve core disk 24 to close the air outlet holes 2301 when no external force is applied.

[0045] The outer end of the air outlet pipe 3 is threadedly connected to the air outlet kit 4, and the air outlet kit 4 includes an outer sleeve 26 threadedly connected to the air outlet pipe 3, and a radial rod 27 is fixedly connected inside the outer sleeve 26, and an axial rod 28 arranged opposite to the valve core disk 24 is fixedly connected to the radial rod 27. When it is necessary to open the air outlet pipe 3 on the volute 1 in a certain direction, the air outlet kit 4 is screwed and installed on the air outlet pipe 3. Specifically, the outer sleeve 26 is screwed, and the outer sleeve 26 drives the axial rod 28 to move toward the valve core disk 24, pushing the valve core disk 24 toward the inside of the air outlet pipe 3, thereby driving the closing valve to realize the outlet of the air outlet pipe 3.

[0046] Compared with traditional centrifugal fans, the present invention is provided with air outlet pipes 3 distributed equidistantly around the circumference and a detachable air outlet kit 4. When the air outlet pipe 3 in any direction of the centrifugal fan needs to be opened, the air outlet kit 4 is screwed and installed to conduct the air, thereby realizing the control of the air outlet direction and the number of air outlet ducts of the centrifugal fan. The air outlet kit 4 is easy to disassemble, realizing modular installation and disassembly.

[0047] Second implementation method:

[0048] Figure 3 、 Figure 5-7 and Figure 10 A modular multi-duct environmentally friendly centrifugal fan is shown. Based on the first embodiment, the outer ring cover 1201 is fixedly connected to a plurality of external heat exchange tubes 15 extending to the outside of the outer heat exchange tube 9. The external heat exchange tubes 15 are connected to the ball cavity and are located between adjacent second blades 14.

[0049] Specifically, by providing an external heat exchange tube 15, the lubricating oil in the ball cavity can exchange heat with the lubricating oil flowing into the external heat exchange tube 15, thereby increasing the heat exchange area of ​​the lubricating oil, realizing the coordinated use of air cooling and liquid cooling, and thereby accelerating the heat dissipation of the bearing 12. At the same time, the air flow flowing through the annular flow cavity is fully in contact with the external heat exchange tube 15 under the guidance of the adjacent second blade 14.

[0050] See also Figure 3An inner heat exchange chamber 1101 is opened in the shell wall of the inner heat exchange tube 11, and the inner heat exchange chamber 1101 is connected to the ball chamber through multiple pairs of first connecting tubes 16 and second connecting tubes 17 located on both sides of the bearing 12. Both the first connecting tubes 16 and the second connecting tubes 17 are fixedly connected to the side wall of the inner ring cover 1202.

[0051] Specifically, by providing an inner heat exchange cavity 1101 in the inner heat exchange cylinder 11 , the flow of lubricating oil is increased, thereby further improving the heat exchange effect.

[0052] See also Figure 3 A heat collecting tube 18 is installed in the inner heat exchange cavity 1101 . The heat collecting tube 18 is filled with phase change material. The heat collecting tube 18 is an annular hollow tube. The heat collecting tube 18 is fixedly connected to the inner wall of the inner heat exchange cavity 1101 through a fixing column 19 .

[0053] Specifically, by setting a heat collecting tube 18 in the inner heat exchange cavity 1101, the phase change material in the heat collecting tube 18 is used to quickly collect the heat of the motor 10 and the bearing 12, thereby reducing the accumulation of heat on the bearing 12 and the shell wall surface of the motor 10.

[0054] See also Figure 3 and Figure 7 An inner ring plate 20 is slidably connected to the heat collecting tube 18, and the inner ring plate 20 is fixedly connected to multiple transverse rods 21 extending into the inner heat exchange cavity 1101. The transverse rods 21 are fixedly connected to an outer ring plate 22 that slides against the inner wall of the inner heat exchange cavity 1101. The phase change material filled in the heat collecting tube 18 is a solid-gas phase change material.

[0055] Specifically, when the heat collecting tube 18 absorbs heat in a concentrated manner, the solid-gas phase change material inside it sublimates from solid to gas, which increases the air pressure inside the heat collecting tube 18, pushing the inner ring plate 20 to move. The inner ring plate 20 pushes the outer ring plate 22 to move through the transverse rod 21, and the outer ring plate 22 pushes the lubricating oil in the inner heat exchange cavity 1101 to force flow, thereby increasing the flow of lubricating oil in both the inner heat exchange cavity 1101 and the roller cavity, thereby improving the heat exchange effect.

[0056] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A modular multi-duct environmentally friendly centrifugal fan, characterized in that: The invention comprises a volute (1), wherein the front end of the volute (1) is fixedly connected to a front cover plate (2), an air inlet (201) is provided at the center of the front cover plate (2), a centrifugal impeller (5) is provided in the volute (1), the centrifugal impeller comprises a front disc (6) and a rear disc (8) and a first blade (7) arranged between the two and fixedly connected to the two, an outer heat exchange tube (9) fixedly connected to the rear disc (8) is provided on the inner side of the first blade (7), the outer heat exchange tube (9) is fixedly connected to the output shaft of the motor (10), a front opening (601) arranged opposite to the air inlet (201) is provided on the front disc (6), and an air outlet pipe (3) is fixedly connected to the outer circumferential wall of the volute (1); The motor (10) is fixedly sleeved with an inner heat exchange tube (11) on the outside. The inner heat exchange tube (11) is fixedly connected to the inner wall of the volute (1) away from the air inlet (201). The inner heat exchange tube (11) and the outer heat exchange tube (9) are rotatably connected via a bearing (12). The bearing (12) includes an outer ring cover (1201) and an inner ring cover (1202) that are rotatably connected. The outer ring cover (1201) and the inner ring cover (1202) enclose a closed ball cavity, and the ball cavity is filled with evenly distributed balls (1203) and lubricating oil. The outer ring cover (1201) is fixedly connected to the inner wall of the outer heat exchange tube (9), and the inner ring cover (1202) is fixedly connected to the outer wall of the inner heat exchange tube (11); The outer side of the outer heat exchange tube (9) is provided with a guide tube (13) fixedly connected to the inner wall of the front disk (6); an annular flow cavity for air flow is formed between the front disk (6), the guide tube (13) and the outer heat exchange tube (9); an annular flow gap communicating with the annular flow cavity is formed between the guide tube (13) and the rear disk (8); and a second blade (14) is fixedly connected to the outer circumferential wall of the outer heat exchange tube (9); The number of the air outlet pipes (3) is plural and they are equidistantly distributed on the circumferential side wall of the volute (1). A closing valve is provided at the outer opening of the air outlet pipe (3). The closing valve comprises an air outlet plate (23) fixedly connected to the inner wall of the air outlet pipe (3). The air outlet plate (23) is provided with a plurality of air outlet holes (2301). The air outlet plate (23) is slidably connected to a valve core disk (24) arranged opposite to the air outlet holes (2301). The valve core disk (24) is sleeved with a spring (25) abutting against the air outlet plate (23). The outer end of the air outlet pipe (3) is threadedly connected to an air outlet kit (4). The air outlet kit (4) comprises an outer sleeve (26) threadedly connected to the air outlet pipe (3). A radial rod (27) is fixedly connected inside the outer sleeve (26). An axial rod (28) arranged opposite to the valve core disk (24) is fixedly connected to the radial rod (27).

2. A modular multi-duct environmentally friendly centrifugal fan according to claim 1, characterized in that: The front disc (6) and the rear disc (8) are both disc-shaped structures. The rear disc (8) is provided with a rear opening (801) arranged opposite to the front opening (601). The outer heat exchange tube (9) is fixedly connected to the inner wall of the rear opening (801).

3. The modular multi-duct environmentally friendly centrifugal fan according to claim 1, characterized in that: The outer heat exchange tube (9) and the inner heat exchange tube (11) are both cylindrical structures, and are both made of a heat-conducting material, which is one of aluminum oxide and aluminum nitride.

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