An outer rotor motor structure for a centrifugal fan

Abstract

The utility model relates to a kind of outer rotor motor structure for centrifugal fan, belong to centrifugal fan technical field, including wind wheel shell, the side of wind wheel shell is equipped with vortex shell, the outside of vortex shell is fixedly connected with several elastic clamps, the outside of wind wheel shell is fixedly connected with the buckle of elastic clamp cooperation, elastic clamp and corresponding buckle are interference fit, the inside of wind wheel shell is equipped with air inlet.This utility model's beneficial effect lies in, the scheme is connected with impeller by using the structure of outer rotor motor, the overall size of centrifugal fan can be reduced, so that the centrifugal fan is installed in narrow space, and the overall volume of the centrifugal fan is smaller, more convenient for staff to install and use, and the cooperation of buckle and elastic clamp is used to replace traditional screw connection mode, with installation convenient, beneficial to disassembly and repair in narrow space.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal fan technology, and in particular to an external rotor motor structure for centrifugal fans. Background Technology

[0002] A centrifugal fan is a mechanical device that increases gas pressure and discharges gas by relying on input mechanical energy. It belongs to driven fluid machinery. Its working principle is to accelerate the gas by a high-speed rotating impeller, then decelerate and change the flow direction, so that kinetic energy is converted into potential energy (pressure). In a single-stage centrifugal fan, the gas enters the impeller axially, changes to radial flow as it passes through the impeller, and decelerates after entering the diffuser, converting kinetic energy into pressure energy. In a multi-stage centrifugal fan, a return flow device is used to direct the airflow into the next impeller, generating higher pressure.

[0003] However, in order to facilitate installation, the centrifugal fans in existing fresh air systems mostly adopt an internal rotor motor drive structure, which results in a large overall size of the centrifugal fan due to the large volume of the internal rotor motor structure. In addition, most centrifugal fans currently use screw connections, which is not conducive to disassembly and maintenance in narrow spaces.

[0004] To address these issues, we propose an external rotor motor structure for centrifugal fans. Utility Model Content

[0005] In view of the above-mentioned problems in the prior art, the main objective of this utility model is to provide an external rotor motor structure for centrifugal fans.

[0006] The technical solution of this utility model is as follows: an external rotor motor structure for a centrifugal fan includes a wind turbine housing, a vortex housing on one side of the wind turbine housing, a plurality of elastic clips fixedly connected to the outer side of the vortex housing, and a buckle fixedly connected to the outer side of the wind turbine housing for use with the elastic clips. The elastic clips and the corresponding buckles are in an interference fit. An air inlet is opened inside the wind turbine housing, and an air outlet is fixedly installed at the top of the vortex housing. An impeller is provided inside the wind turbine housing, an external rotor shaft is rotatably installed inside the impeller, a motor assembly is installed inside the impeller, and a stator is axially installed on the inner wall of the motor assembly.

[0007] By adopting the above technical solution and using an external rotor motor structure to connect with the impeller, the overall size of the centrifugal fan can be reduced, allowing it to be installed in narrow spaces. Furthermore, the smaller overall size of the centrifugal fan makes it easier for workers to install and use.

[0008] In a preferred embodiment, the outer end of the motor assembly is fixedly connected with an anti-disengagement lock, a limit sleeve and a deep groove ball bearing are installed on the outer side of the outer rotor shaft, and a wave washer is installed on the outer side of the outer rotor shaft between the limit sleeve and the deep groove ball bearing.

[0009] By adopting the above technical solution and using wave-shaped gaskets, a tight sealing layer can be formed on the contact surface, effectively preventing the intrusion of liquids, gases and dust, thereby ensuring the stable operation of the outer rotor shaft and stator.

[0010] In a preferred embodiment, a dustproof screen is provided at the inlet of the impeller, and the dustproof screen is fixedly installed on the inner wall of the impeller housing.

[0011] By adopting the above technical solution and installing a dustproof mesh cover, the amount of external dust entering the centrifugal fan can be reduced.

[0012] In a preferred embodiment, a support frame is fixedly installed inside the vortex housing, and the impeller is installed on the side of the support frame away from the vortex housing.

[0013] By adopting the above technical solution and setting up the support frame, the impeller can be provided with better support.

[0014] In a preferred embodiment, the outer surface of the outer rotor shaft is fitted with a shaft elastic retaining ring.

[0015] By adopting the above technical solution and setting the shaft elastic retaining ring, axial displacement and axial vibration of the outer rotor shaft can be prevented.

[0016] In a preferred embodiment, a number of mounting brackets are fixedly connected to the outer side of the wind turbine shell, and each mounting bracket has mounting holes inside.

[0017] By adopting the above technical solution, the wind turbine housing and the vortex housing can be fixed together through the use of the mounting bracket and locking bolts.

[0018] In a preferred embodiment, each of the mounting holes is threaded with a locking bolt, and the mounting bracket is connected to the vortex housing via the locking bolt.

[0019] By adopting the above technical solution and using locking bolts, it is possible for staff to perform maintenance on the centrifugal fan.

[0020] Compared with the prior art, the advantages and positive effects of this utility model are as follows: 1. In this utility model, during operation, gas enters the impeller center axially from the air inlet, and the impeller blades drive the gas to rotate at high speed. Under the action of centrifugal force, the gas is thrown to the outer edge of the impeller. The high-speed gas enters the vortex shell, and the high-pressure gas is discharged through the air outlet, thereby completing the conveying or pressurization process. This solution uses an external rotor motor structure to connect with the impeller, which can reduce the overall size of the centrifugal fan, so that the centrifugal fan can be installed in narrow spaces. Moreover, the overall volume of the centrifugal fan is small, making it more convenient for workers to install and use. Furthermore, the use of buckles and elastic clips replaces the traditional screw connection method, which is convenient for installation and facilitates disassembly and maintenance in narrow spaces.

[0021] 2. In this utility model, the use of wave washers can form a tight sealing layer on the contact surface, effectively blocking the intrusion of liquids, gases and dust, thereby ensuring the stable operation of the outer rotor shaft and stator, reducing the friction between motor bearings, improving the operating efficiency of the motor, and preventing axial displacement and axial vibration of the outer rotor shaft by setting the shaft elastic retaining ring. Attached Figure Description

[0022] Figure 1 This utility model provides an overall perspective view of the external rotor motor structure for a centrifugal fan; Figure 2 This utility model provides an internal schematic diagram of an external rotor motor structure for a centrifugal fan; Figure 3 This utility model provides a partial schematic diagram of an external rotor motor structure for a centrifugal fan; Figure 4 This utility model provides a cross-sectional view of an external rotor motor structure for a centrifugal fan.

[0023] Legend: 1. Wind turbine housing; 2. Vortex housing; 3. Limiting bushing; 4. Wave washer; 5. Deep groove ball bearing; 6. Shaft retaining ring; 7. Clip; 8. Elastic clip; 9. Motor assembly; 10. Anti-detachment lock; 11. Stator; 12. Mounting bracket; 13. Mounting hole; 14. Air outlet; 15. Air inlet; 16. Dustproof screen; 17. Impeller; 18. Support frame. Detailed Implementation

[0024] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0025] Reference Figure 1-4 An external rotor motor structure for a centrifugal fan includes a rotor housing 1, a vortex housing 2 on one side of the rotor housing 1, several elastic clips 8 fixedly connected to the outer side of the vortex housing 2, and a buckle 7 for cooperating with the elastic clips 8 fixedly connected to the outer side of the rotor housing 1. The elastic clips 8 and the corresponding buckles 7 are in an interference fit. An air inlet 15 is opened inside the rotor housing 1, and an air outlet 14 is fixedly installed at the top of the vortex housing 2. An impeller 17 is provided inside the rotor housing 1, and an external rotor shaft is rotatably installed inside the impeller 17. A motor assembly 9 is installed inside the impeller 17. The motor assembly 9 includes a rotor magnetic ring and a stator 11. The rotor magnetic ring is fixedly connected in a ring shape to the inner wall of one side of the impeller 17, while the stator is movably connected to the inner wall of the rotor magnetic ring by a magnetic levitation air gap fit, and the air gap between the two is 0.2-2mm. In this embodiment, the internal iron core of the stator can be selected as a twelve-slot ten-pole or twelve-slot fourteen-pole structure.

[0026] During operation, gas enters the center of impeller 17 axially from the air inlet 15. The blades of impeller 17 drive the gas to rotate at high speed. Under the action of centrifugal force, the gas is thrown to the outer edge of impeller 17. The high-speed gas enters the vortex shell 2, where its speed decreases and its kinetic energy is further converted into static pressure energy. The high-pressure gas is discharged through the air outlet 14, completing the conveying or pressurization process. This scheme uses an external rotor motor structure to connect with impeller 17, which can reduce the overall size of the centrifugal fan, making it easier to install in narrow spaces. The overall size of the centrifugal fan is also smaller, making it more convenient for workers to install and use. Furthermore, the use of clips 7 and elastic clips 8 replaces the traditional screw connection method, making installation convenient and facilitating disassembly and maintenance in narrow spaces.

[0027] Specifically, the outer end of the motor assembly 9 is fixedly connected with an anti-loosening latch 10. A limiting sleeve 3 and a deep groove ball bearing 5 are installed on the outer side of the outer rotor shaft. The limiting sleeve 3 can limit the outer rotor shaft to a certain extent, preventing damage to the outer rotor shaft due to external shaking during use. A wave washer 4 is installed on the outer side of the outer rotor shaft between the limiting sleeve 3 and the deep groove ball bearing 5. The use of the wave washer 4 can form a tight sealing layer on the contact surface, effectively preventing the intrusion of liquid, gas and dust, thereby protecting the outer rotor shaft. The impeller 17 is equipped with a dustproof screen 16 at its inlet. The dustproof screen 16 is fixedly installed on the inner wall of the impeller housing 1, which can reduce the entry of external dust into the centrifugal fan and reduce dust accumulation. The vortex housing 2 is fixedly installed with a support frame 18 inside. The support frame 18 can provide better support for the impeller 17. The impeller 17 is installed on the side of the support frame 18 away from the vortex housing 2.

[0028] Specifically, the outer surface of the outer rotor shaft is fitted with a shaft elastic retaining ring 6. The setting of the shaft elastic retaining ring 6 can prevent the outer rotor shaft from generating axial displacement and axial vibration. Several mounting brackets 12 are fixedly connected to the outer side of the impeller housing 1. By using the mounting brackets 12 in conjunction with the locking bolts, the impeller housing 1 and the vortex housing 2 can be fixed together. The mounting brackets 12 are all provided with mounting holes 13. The mounting holes 13 are all threaded with locking bolts. The mounting brackets 12 and the vortex housing 2 are connected by locking bolts so that the staff can carry out maintenance.

[0029] Working principle: First, during operation, the operator can start the centrifugal fan through an external control device. Gas enters the center of the impeller 17 axially from the air inlet 15. The blades of the impeller 17 drive the gas to rotate at high speed. Under the action of centrifugal force, the gas is thrown to the outer edge of the impeller 17. The high-speed gas enters the vortex shell 2, where its speed decreases and its kinetic energy is further converted into static pressure energy. The high-pressure gas is discharged through the air outlet 14, completing the conveying or pressurization process. The use of the wave washer 4 forms a tight sealing layer on the contact surface, effectively preventing the intrusion of liquid, gas, and dust, thereby ensuring the stable operation of the outer rotor shaft and stator 11. It can also reduce the friction between the motor bearings and improve the motor's operating efficiency. Furthermore, the setting of the shaft elastic retaining ring 6 can prevent the outer rotor shaft from generating axial displacement and axial vibration. The overall size of the centrifugal fan is small, making it more convenient for operators to install and use. The use of the buckle 7 and elastic clip 8 replaces the traditional screw connection method, which is convenient for installation and facilitates disassembly and maintenance in narrow spaces.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0031] The above are merely preferred embodiments of this application and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An external rotor motor structure for a centrifugal fan, comprising a fan housing (1), characterized in that: The wind turbine housing (1) has a vortex housing (2) on one side. Several elastic clips (8) are fixedly connected to the outer side of the vortex housing (2). The wind turbine housing (1) has a buckle (7) that works with the elastic clips (8) fixedly connected to the outer side. The elastic clips (8) and the corresponding buckles (7) are in an interference fit. The wind turbine housing (1) has an air inlet (15) inside. The top of the vortex housing (2) has an air outlet (14) fixedly installed. The wind turbine housing (1) has an impeller (17) inside. An outer rotor shaft is rotatably installed inside the impeller (17). A motor assembly (9) is installed inside the impeller (17). A stator (11) is axially installed on the inner wall of the motor assembly (9).

2. The external rotor motor structure for a centrifugal fan according to claim 1, characterized in that: The outer end of the motor assembly (9) is fixedly connected with an anti-disengagement buckle (10). A limit sleeve (3) and a deep groove ball bearing (5) are installed on the outer side of the outer rotor shaft. A wave washer (4) is installed on the outer side of the outer rotor shaft and between the limit sleeve (3) and the deep groove ball bearing (5).

3. The external rotor motor structure for a centrifugal fan according to claim 1, characterized in that: The impeller (17) is provided with a dustproof mesh cover (16) at the inlet, and the dustproof mesh cover (16) is fixedly installed on the inner wall of the impeller shell (1).

4. The external rotor motor structure for a centrifugal fan according to claim 1, characterized in that: A support frame (18) is fixedly installed inside the vortex housing (2), and the impeller (17) is installed on the side of the support frame (18) away from the vortex housing (2).

5. The external rotor motor structure for a centrifugal fan according to claim 1, characterized in that: The outer surface of the outer rotor shaft is fitted with a shaft elastic retaining ring (6).

6. The external rotor motor structure for a centrifugal fan according to claim 1, characterized in that: Several mounting brackets (12) are fixedly connected to the outer side of the wind turbine shell (1), and each mounting bracket (12) has mounting holes (13) inside.

7. The external rotor motor structure for a centrifugal fan according to claim 6, characterized in that: The mounting holes (13) are all threaded with locking bolts, and the mounting bracket (12) is connected to the vortex shell (2) by locking bolts.

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