A stirring device special for industrial production of permanent magnet drive

Abstract

The utility model provides a kind of industrial production permanent magnet drive special stirring device, can effectively solve the problems of lower efficiency, large energy consumption, high maintenance cost, low control precision, short service life and poor running stability, including permanent magnet motor, rack, elastic coupling, flange and stirrer, the rotating shaft of permanent magnet motor is vertically downward and is mounted on the top of rack by support, double support point bearing support frame is arranged in rack, transmission shaft upper end passes through first bearing frame and is rotatably mounted on bearing frame, the rotating shaft of permanent magnet motor is connected together with the upper end of transmission shaft by elastic coupling, transmission shaft lower end bearing frame is rotatably mounted on bearing frame, the end of transmission shaft that stretches out bearing frame is installed and connected together by output flange and the connecting flange of stirrer. Its structure is simple, novel and unique, easy to install and use, with good effect and practical application value.

Description

Technical Field

[0001] This utility model relates to the field of industrial production stirring equipment technology, and in particular to a special permanent magnet driven stirring device for industrial production used in large-scale stirred reaction vessels. Background Technology

[0002] In industrial production sectors such as chemical, metallurgical, food, and pharmaceutical manufacturing, mixing devices are among the core equipment. Traditional mixing drive systems typically consist of an asynchronous motor, a reducer, a coupling, and a conventional frame. Due to structural limitations, this system suffers from several drawbacks: 1) a long transmission chain, resulting in low efficiency and high energy consumption due to multiple energy transfer stages; 2) the need for regular maintenance of the reducer and mechanical seal, leading to high maintenance costs; 3) a limited speed range, slow response, and low control precision; and 4) complex radial and axial forces ultimately transmitted to the reducer and motor shaft, affecting their lifespan and operational stability.

[0003] Permanent magnet synchronous motors (PMSMs) have become a trend in drive technology development due to their high efficiency, high power density, and excellent speed regulation performance. However, their direct application in mixing applications requires addressing the issue of their inability to withstand enormous axial and radial forces. Therefore, designing a dedicated mixing device that can perfectly match a PMSM and independently withstand all complex loads is crucial for realizing the replacement of traditional drives with PMSM direct drive technology, but no publicly reported examples have been found to date. Utility Model Content

[0004] In view of the above situation and to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a special stirring device for industrial production driven by permanent magnet, which can effectively solve the problems of low efficiency, high energy consumption, high maintenance cost, low control accuracy, short service life and poor operation stability.

[0005] The technical solution provided by this utility model is a special stirring device for industrial production driven by permanent magnets, including a permanent magnet motor, a frame, a flexible coupling, a flange, and a stirrer. The rotating shaft of the permanent magnet motor is vertically downward and mounted on the top of the frame via a bracket. A double-support bearing support frame is provided inside the frame. The double-support bearing support frame is a frame structure composed of an upper transverse support, a lower transverse support, a middle transverse support, and a vertical support. A first bearing frame is mounted in the middle of the middle support, and a second bearing frame is mounted on the lower transverse support. The upper end of the drive shaft passes through the first bearing frame and is rotatably mounted on the first bearing frame via a bearing. The rotating shaft of the permanent magnet motor is connected to the upper end of the drive shaft via the flexible coupling. The lower end of the drive shaft is rotatably mounted on the second bearing frame via a bearing. The end of the drive shaft extending out of the second bearing frame is connected to the stirrer (existing technology) via an output flange and a connecting flange, forming an integrated rotating stirring structure.

[0006] This utility model has a simple, novel, and unique structure, is easy to install and use, and has good results. It combines high-efficiency permanent magnet direct drive technology with a high-strength, high-rigidity double-support bearing frame, realizing the functional decoupling of power transmission and load support. This allows the permanent magnet motor to provide only pure torque, thereby giving full play to its advantages of high efficiency and precise speed regulation, significantly improving the reliability, efficiency, and service life of the entire mixing system, and has practical application value. Attached Figure Description

[0007] Figure 1 This is a partial cutaway view of the structure of this utility model. Figure 2 This is an enlarged structural diagram of the double-support point bearing support frame 2 of this utility model. The components include: 1. Permanent magnet motor; 2. Double-support bearing support frame; 2-1. Upper transverse support; 2-2. Vertical support; 2-3. Middle transverse support; 3. Flexible coupling; 4. First bearing frame; 5. Drive shaft; 6. Second bearing frame; 7. Output flange; 8. Lower transverse support; 9-1. First sealing ring; 9-2. Second sealing ring; 10. Connecting flange; 11. Agitator; 12. Bolt; 13. Frame; 14. Bracket. Detailed Implementation

[0008] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings and specific circumstances.

[0009] Depend on Figure 1-2 As shown, this utility model discloses a special stirring device for industrial production driven by permanent magnets, including a permanent magnet motor 1, a frame 13, an elastic coupling 3, a flange, and a stirrer 11. The rotating shaft of the permanent magnet motor 1 is vertically downward and mounted on the top of the frame 13 via a bracket 14. A double-support point bearing support frame 2 is provided inside the frame 13. The double-support point bearing support frame 2 is a frame structure composed of an upper transverse support 2-1, a lower transverse support 8, a middle transverse support 2-3, and a vertical support 2-2. A first bearing frame 4 is installed in the middle of the middle support 2-3, and a second bearing frame 6 is installed on the lower transverse support 8. The upper end of the drive shaft 5 passes through the first bearing frame 4 and is rotatably mounted on the first bearing frame 4 via a bearing 15. The rotating shaft of the permanent magnet motor 1 is connected to the upper end of the drive shaft 5 via the elastic coupling 3. The lower end of the drive shaft 5 is rotatably mounted on the second bearing frame 6 via a bearing. The end of the drive shaft 5 extending out of the second bearing frame 6 is connected to the stirrer 11 (existing technology) via an output flange 7 and a connecting flange 10, forming an integrated rotating stirring structure.

[0010] To ensure effectiveness and ease of use, the bracket 14 is connected to the upper part of the double-support point bearing support frame 2 by bolts 12.

[0011] The first bearing bracket 4 and the second bearing bracket 6 are fixedly connected to the intermediate transverse support 2-3 and the lower transverse support 8 by bolts and screw holes, respectively, forming a structure that is easy to disassemble and assemble.

[0012] The upper and lower ends of the dual-support bearing support frame 2 and the frame 13 are respectively assembled with bolts through upper screw holes 2-5 and lower screw holes 2-4, forming a structure that is easy to disassemble and assemble.

[0013] The ends of the upper transverse support 2-1, lower transverse support 8, middle transverse support 2-3, and vertical support 2-2 of the dual-support bearing support frame 2 are fixedly welded together to ensure the sturdiness and service life of the support frame.

[0014] The centers of the permanent magnet motor 1, the drive shaft 5, and the agitator 11 are on the same straight line to ensure the mixing effect.

[0015] The first bearing bracket 4 has a first sealing ring 9-1 installed on the inner wall of the through hole, and the second bearing bracket 6 has a second sealing ring 9-2 installed on the inner wall of the through hole. These seals are used to seal the inner cavity of the frame, prevent material dust from entering and protect the bearing, and at the same time prevent lubricant leakage.

[0016] The bearing 15 is any one of an angular contact ball bearing, a tapered roller bearing, a cylindrical roller bearing, or a deep groove ball bearing.

[0017] The aforementioned dual-support point bearing support frame 2 is a support frame structure made of high-strength cast iron or cast steel.

[0018] As can be seen from the above structure, the dual-support bearing support frame 2 and bracket 14 of this utility model are cast or welded structural components with sufficient rigidity and strength. The upper part is provided with an interface for connecting to the stator housing of the permanent magnet synchronous motor, and the lower part is provided with a flange interface for installation on the reaction vessel. A cavity is formed inside the frame to accommodate the dual-support bearing assembly.

[0019] The dual-pivot bearing assembly consists of two large rolling bearings arranged vertically, installed within the inner cavity of the dedicated frame, for supporting and fixing the drive shaft. The upper bearing is preferably an angular contact ball bearing or a tapered roller bearing, primarily used to withstand the axial force and part of the radial force generated during the stirring process; the lower bearing is preferably a cylindrical roller bearing or a deep groove ball bearing, primarily used to withstand the radial force. The dual-pivot bearings work together to withstand all the axial and radial loads transmitted from the stirring shaft.

[0020] The rotor of the permanent magnet synchronous motor is directly mounted on the upper end of the drive shaft via an interference fit or key connection, and rotates synchronously with the drive shaft. The motor stator housing is rigidly connected to the upper part of the dedicated frame by bolts. Thus, the permanent magnet motor body and the stirring shaft are directly driven, eliminating the need for any reduction gear mechanism.

[0021] The drive shaft passes through the special frame and the double-support bearing assembly. Its upper end is connected to the motor rotor (shaft), and its lower end is connected to the stirring shaft of the agitator through a coupling.

[0022] The permanent magnet driven stirrer frame structure of this invention features a double-support point bearing support frame 2 made of high-strength cast iron or cast steel, with a transverse support 8 at the bottom of the frame for connection to the reactor inlet. The stator housing of the permanent magnet motor 1 is bolted to the top of the double-support point bearing support frame 2. The drive shaft 5 is supported within the cavity of the double-support point bearing support frame 2 by a first bearing bracket 4 and a second bearing bracket 6. The first bearing bracket 4 consists of paired angular contact ball bearings or tapered roller bearings, used to withstand bidirectional axial forces; the second bearing bracket 6 consists of cylindrical roller bearings, used to withstand radial forces and allow for slight thermal expansion displacement of the shaft.

[0023] The rotor of the permanent magnet motor 1 is directly heat-shrinkly or keyed to the upper end of the drive shaft 5. The lower end of the drive shaft 5 is connected to the stirring shaft below via the output flange 7. The first bearing bracket 4 and the second bearing bracket 6 are bolted to the double-support point bearing support bracket 2 via the bearing housing (not shown in the figure), and the sealing ring at the joint can effectively seal the connection.

[0024] During operation, the permanent magnet motor 1 generates torque when energized, directly driving the transmission shaft 5 to rotate, which in turn drives the stirring shaft and impeller to rotate. All complex loads generated by stirring, such as axial water thrust and radial sway, are borne by the double-support bearing assembly within the double-support bearing support frame 2 and transmitted to the robust double-support bearing support frame 2, and ultimately borne by the reactor body, ensuring that the permanent magnet motor 1 always operates under the ideal condition of only bearing torque.

[0025] Compared with existing technologies, it has the following outstanding and beneficial technical effects: High efficiency and energy saving: It adopts a permanent magnet synchronous motor for direct drive, eliminating the speed reducer, which significantly improves transmission efficiency and reduces energy consumption by 15%-30%.

[0026] High reliability and long lifespan: Complex axial and radial forces are independently borne by a double-pivot bearing assembly within a dedicated frame, while the permanent magnet motor only bears pure torque. This greatly improves the operating environment, reduces the failure rate, and extends the overall service life by more than 2 times.

[0027] Precise stepless speed regulation: The permanent magnet motor, in conjunction with the frequency converter, can achieve a wide range and high precision stepless speed regulation to meet the stirring speed requirements of different process stages. The control response is fast and the accuracy is high, reaching 99.9%.

[0028] Easy maintenance: It eliminates the need for regular maintenance of the reducer. Only the double-pivot bearing needs to be lubricated regularly. The workload of maintenance and overhaul costs are greatly reduced, by 40-50%.

[0029] Compact structure and easy installation: The overall structure is compact with a short axial dimension. It can be directly installed on the reactor through the lower flange of the frame, making installation and alignment simple and improving installation efficiency by more than three times. It has great value for promotion and application.

[0030] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A permanent magnet driven stirring device for industrial production, comprising a permanent magnet motor (1), a frame (13), a flexible coupling (3), a flange, and a stirrer (11), characterized in that, The rotating shaft of the permanent magnet motor (1) is vertically downward and mounted on the top of the frame (13) via a bracket (14). A double-support bearing support frame (2) is installed inside the frame (13). The double-support bearing support frame (2) is a frame structure composed of an upper transverse support (2-1), a lower transverse support (8), a middle transverse support (2-3), and a vertical support (2-2). A first bearing frame (4) is installed in the middle of the middle transverse support (2-3), and a second bearing frame (6) is installed on the lower transverse support (8). The upper end of the drive shaft (5) passes through the first bearing bracket (4) and is rotatably mounted on the first bearing bracket (4) via the bearing (15). The rotating shaft of the permanent magnet motor (1) is connected to the upper end of the drive shaft (5) via the elastic coupling (3). The lower end of the drive shaft (5) is rotatably mounted on the second bearing bracket (6) via the bearing. The end of the drive shaft (5) extending out of the second bearing bracket (6) is connected to the output flange (7) and the connecting flange (10) of the agitator (11) to form an integrated rotating agitation structure.

2. The industrial production permanent magnet driven special stirring device according to claim 1, characterized in that, The bracket (14) is connected to the upper part of the double support point bearing support frame (2) by bolts (12).

3. The industrial production permanent magnet driven special stirring device according to claim 1, characterized in that, The first bearing bracket (4) and the second bearing bracket (6) are fixedly connected to the intermediate transverse support (2-3) and the lower transverse support (8) respectively by bolts and screw holes, forming a structure that is easy to disassemble and assemble.

4. The industrial production permanent magnet driven special stirring device according to claim 1, characterized in that, The upper and lower ends of the dual-support bearing support frame (2) and the frame (13) are respectively assembled with bolts through upper screw holes (2-5) and lower screw holes (2-4) to form a structure that is easy to disassemble and assemble.

5. The industrial production permanent magnet driven special stirring device according to claim 1, characterized in that, The upper transverse support (2-1), lower transverse support (8), middle transverse support (2-3), and vertical support (2-2) of the dual-support bearing support frame (2) are fixedly welded together to ensure the sturdiness and service life of the support frame.

6. The industrial production permanent magnet driven special stirring device according to claim 1, characterized in that, The stirring shafts of the permanent magnet motor (1), the drive shaft (5), and the stirrer (11) are all on the same straight line to ensure the stirring effect.

7. The industrial production permanent magnet driven special stirring device according to claim 1, characterized in that, The first bearing bracket (4) is equipped with a first sealing ring (9-1) on the inner wall of the through hole, and the second bearing bracket (6) is equipped with a second sealing ring (9-2) on the inner wall of the through hole, which are used to seal the inner cavity of the frame, prevent material dust from entering and protect the bearing, and at the same time prevent lubricant leakage.

8. The industrial production permanent magnet driven special stirring device according to claim 1, characterized in that, The bearing (15) is any one of angular contact ball bearing, tapered roller bearing, cylindrical roller bearing or deep groove ball bearing.

9. The industrial production permanent magnet driven special stirring device according to claim 1, characterized in that, The dual-support bearing support frame (2) is a support frame structure made of high-strength cast iron or cast steel.

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