Permanent magnet motor direct drive type stirrer

Abstract

The utility model discloses a permanent magnet motor direct drive type stirrer which comprises a permanent magnet motor (1), the output end of the permanent magnet motor (1) is provided with a main shaft (2), and the end part of the main shaft (2) is provided with paddles (3); a shaft sleeve (4) is arranged on the main shaft (2), a mechanical seal seat (5) is arranged on the shaft sleeve (4), and a mechanical seal assembly (6) is arranged between the mechanical seal seat (5) and the shaft sleeve (4); a packing seat (7) is arranged at one end of the mechanical seal assembly (6) and on the shaft sleeve (4), a seal assembly (8) is arranged between the packing seat (7) and the shaft sleeve (4), and a gland (9) is arranged at one end of the shaft sleeve (4) and close to one side of the packing seat (7). The paddle is directly driven by the permanent magnet motor, and the permanent magnet motor has the characteristics of high efficiency, energy conservation, compact structure, high reliability and high transmission efficiency.

Description

Technical Field

[0001] This utility model relates to slurry agitator equipment, and in particular to a permanent magnet motor direct-drive agitator. Background Technology

[0002] To ensure the pulp in the pulp tank remains suspended and of uniform concentration during circulation, agitators are installed within the pulp tank. For example, Chinese invention patent CN117443224A discloses a pulp agitator, comprising a frame, a reducer mounted on top of the frame, a motor mounted on the reducer, a vertical stirring shaft whose upper end is fixedly connected to the output shaft of the reducer, a hub fixedly mounted on the lower end of the stirring shaft, and blades mounted on the hub. A rotating arm is rotatably connected to the hub, the axis of rotation of the rotating arm being perpendicular to the stirring shaft, and the blades being connected to the rotating arm. An end plate is located below the hub, and a connecting rod is provided between the end plate and the rotating arm. The end plate and the rotating arm are respectively hinged to one end of the connecting rod. A vertical push rod is fixedly mounted on the end plate, and the hub and the stirring shaft are both slidably engaged with the push rod. The reducer is equipped with a manual drive mechanism for driving the push rod up and down, or the stirring shaft is equipped with an automatic drive mechanism for driving the push rod up and down. The motor output and reduction gear structure of this type of mixer will lose the kinetic energy output by the motor, resulting in energy loss. In addition, the motor output and reduction gear structure have installation accuracy requirements and are costly to maintain in the later stage. Utility Model Content

[0003] The purpose of this invention is to provide a permanent magnet motor direct-drive mixer. This invention directly drives the impeller with a permanent magnet motor, featuring high efficiency and energy saving, compact structure, high reliability, and high transmission efficiency.

[0004] The technical solution of the present invention is as follows: A permanent magnet motor direct-drive stirrer includes a permanent magnet motor, the output end of which has a main shaft, and the end of the main shaft has a blade; a bushing is provided on the main shaft, a mechanical seal seat is provided on the bushing, and a mechanical seal assembly is provided between the mechanical seal seat and the bushing; a packing seat is provided at one end of the mechanical seal assembly and on the bushing, a sealing assembly is provided between the packing seat and the bushing, and a pressure cap is provided at one end of the bushing and on the side close to the packing seat.

[0005] In the aforementioned permanent magnet motor direct-drive mixer, a water-retaining ring is provided on the main shaft and close to the permanent magnet motor.

[0006] In the aforementioned permanent magnet motor direct-drive agitator, the sealing assembly includes a packing layer disposed between the packing seat and the bushing, and sealing rings are provided between the packing seat and the bushing and at both ends of the packing layer.

[0007] In the aforementioned permanent magnet motor direct-drive mixer, the impeller includes a hub connected by a key to one end of the main shaft. The hub has multiple blades on its circumferential surface, and the end of the main shaft is provided with a hub cover that is in close contact with the hub.

[0008] In the aforementioned permanent magnet motor direct-drive mixer, a rubber ring is provided between the end face of the hub cover and one end face of the hub.

[0009] In the aforementioned permanent magnet motor direct-drive agitator, the mechanical seal assembly includes an outer stationary ring seat disposed within the mechanical seal base, with a stationary ring disposed within the outer stationary ring seat. An outer moving ring seat is disposed at the end of the bushing, with a moving ring disposed within the outer moving ring seat that contacts the stationary ring. A cylindrical body is disposed at one end of the outer stationary ring seat, and a sealing seat is disposed at one end of the cylindrical body. An inner stationary ring seat is disposed within the sealing seat. An auxiliary ring is disposed on the bushing, and an inner stationary ring that fits against the inner stationary ring seat is disposed between the auxiliary ring and the bushing.

[0010] Compared with existing technologies, in this invention, the main shaft of the permanent magnet motor output end is directly connected to the blade, and the permanent magnet motor directly drives the blade to rotate. The permanent magnet motor itself has high efficiency, and directly driving the blade avoids the energy loss caused by traditional transmission methods. It can more effectively convert the output power of the motor into the mechanical energy of the blade, generating a larger output torque, thereby improving the energy utilization efficiency of the entire device, reducing energy consumption, and making it more suitable for the working environment of the agitator. This invention eliminates the complex reduction mechanism, making the system structure simpler and more compact, reducing the footprint and weight. Due to the reduction of the reduction mechanism, the probability of system failure caused by wear and failure of transmission components is reduced, improving the reliability and stability of the system. The simplified structure reduces the number of parts that need to be regularly maintained and replaced, reducing maintenance costs and workload. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 This is a schematic diagram of the sealing assembly;

[0013] Figure 3 This is a schematic diagram of the rubber ring structure.

[0014] The markings in the attached diagram are as follows: 1-Permanent magnet motor, 2-Main shaft, 3-Blade, 4-Shaft sleeve, 5-Mechanical seal seat, 6-Mechanical seal assembly, 7-Packing seat, 8-Sealing assembly, 9-Gland, 10-Water baffle ring, 11-Packing layer, 12-Sealing ring, 13-Hub, 14-Blade, 15-Hub cover, 16-Rubber ring, 17-Outer stationary ring seat, 18-Outer stationary ring, 19-Outer moving ring seat, 20-Moving ring, 21-Cylinder body, 22-Sealing seat, 23-Inner stationary ring seat, 24-Auxiliary ring, 25-Inner stationary ring. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0016] Example: A direct-drive permanent magnet motor stirrer includes a permanent magnet motor 1. The permanent magnet motor uses high-performance permanent magnet materials to generate a magnetic field, eliminating the need for winding energization to generate a magnetic field as in traditional electrically excited motors. Therefore, with the same volume and weight, the permanent magnet motor can output higher power and has a higher power density. The output end of the permanent magnet motor 1 has a main shaft 2, as shown in the attached diagram. Figure 1 As shown, the main shaft is the output shaft of a permanent magnet motor, and the end of the main shaft 2 has a blade 3. The blade 3 includes a hub 13 connected by a key to one end of the main shaft 2. The hub 13 has multiple blades 14 on its circumferential surface. The end of the main shaft 2 is provided with a hub cover 15, which is tightly attached to the hub 13. The hub has bolts that connect it to the end of the main shaft. The hub cover is connected to the end face of the main shaft by screws, and the end face of the hub cover contacts the end face of the hub. A rubber ring 16 is provided between the end face of the hub cover 15 and one end face of the hub 13. Figure 3 As shown, to prevent slurry from entering the gap between the hub and the main shaft, a rubber ring is installed between the hub cover and the hub. A bushing 4 is mounted on the main shaft 2, a mechanical seal seat 5 is mounted on the bushing 4, and a mechanical seal assembly 6 is installed between the mechanical seal seat 5 and the bushing 4. One end of the mechanical seal assembly 6 and a packing seat 7 are provided on the bushing 4, and a sealing assembly 8 is provided between the packing seat 7 and the bushing 4, as shown in the attached diagram. Figure 2 As shown, a pressure cap 9 is provided at one end of the bushing 4, close to the packing seat 7. The sealing assembly 8 includes a packing layer 11 disposed between the packing seat 7 and the bushing 4. This packing layer is made of oil-impregnated asbestos and has self-lubricating properties. It forms a lubricating film when the main shaft rotates, reducing wear. Sealing rings 12 are installed between the packing seat 7 and the bushing 4, located at both ends of the packing layer 11. The sealing rings provide a good sealing effect. The sealing assembly 8 can prevent slurry leakage and impurity intrusion, while also assisting in supporting the main shaft, reducing operational wear, and ensuring stable and reliable operation of the agitator in complex environments such as pulp tanks. A water-retaining ring 10 is provided on the main shaft 2, close to the permanent magnet motor 1. The entire device is connected to the pulp tank. The water-retaining ring can prevent liquid from flowing along the main shaft into the permanent magnet motor and causing damage to the permanent magnet motor.

[0017] The mechanical seal assembly 6 includes an outer stationary ring seat 17 disposed within the mechanical seal base 5, with a stationary ring inside the outer stationary ring seat 17. An outer moving ring seat 19 is provided at the end of the bushing 4, with a moving ring 20 inside the outer moving ring seat 19 that contacts the stationary ring. One end of the outer stationary ring seat 17 is provided with a cylindrical body 21, and one end of the cylindrical body 21 has a sealing seat 22. An inner stationary ring seat 23 is provided inside the sealing seat 22. An auxiliary ring 24 is installed on the bushing 4, and an inner stationary ring 25 that fits against the inner stationary ring seat 23 is provided between the auxiliary ring 24 and the bushing 4. It can effectively prevent the slurry and other media inside the agitator from leaking into the external environment, and at the same time prevent external impurities from entering the agitator and affecting the operation of the equipment, ensuring the normal operating environment of the equipment; the mechanical seal assembly and the bushing are installed together, which can provide auxiliary support for the main shaft to a certain extent, reducing the shaking caused by uneven force during the rotation of the main shaft, helping to ensure the stability of the main shaft operation, and making the agitator run more smoothly and reliably; the reasonable cooperation and relative movement between the components in the mechanical seal assembly can form a certain lubrication and buffering effect during operation, reducing friction and wear between components, extending the service life of the equipment, reducing maintenance costs, and improving the reliability and stability of the equipment.

[0018] The working principle of this invention: When the permanent magnet motor direct-drive agitator is working, the main shaft 2, as a key component for power transmission, directly transmits the power of the permanent magnet motor 1 to the impeller 3. The impeller 3 consists of a hub 13 connected by a key at one end of the main shaft 2 and multiple blades 14 on its circumferential surface. When the main shaft 2 rotates, it drives the hub 13 and the blades 14 to rotate together through the key connection. During the rotation, the blades 14 generate thrust on the pulp in the pulp tank, pushing the pulp to circulate, thereby keeping the pulp in a suspended state and with uniform concentration during the flow. To ensure the stable operation of the agitator, its sealing and protection structure plays an important role. The bushing 4 installed on the main shaft 2, together with the mechanical seal seat 5 and the mechanical seal assembly, Component 6, along with the packing seat 7 and sealing assembly 8, together form a multi-layer sealing system to prevent slurry leakage and impurity intrusion. Throughout the operation, the permanent magnet motor 1 directly drives the blade 3, eliminating the reduction gear mechanism and avoiding energy loss caused by traditional transmission methods. This more effectively converts the motor's output power into the mechanical energy of the blade 3, generating a larger output torque, improving energy utilization efficiency, reducing energy consumption, and making it more suitable for the working environment of the agitator. The simplified structure not only makes the system more compact, reducing the footprint and weight, but also reduces the probability of system failure due to wear and malfunction of transmission components, improving the system's reliability and stability, while also reducing maintenance costs and workload.

Claims

1. A permanent magnet motor direct drive mixer comprising a permanent magnet motor (1), the output of the permanent magnet motor (1) having a spindle (2), the end of the spindle (2) having a paddle (3); characterised in that: The main shaft (2) is provided with a bushing (4), the bushing (4) is provided with a mechanical seal seat (5), and a mechanical seal assembly (6) is provided between the mechanical seal seat (5) and the bushing (4); a packing seat (7) is provided at one end of the mechanical seal assembly (6) and on the bushing (4), a sealing assembly (8) is provided between the packing seat (7) and the bushing (4), and a pressure cap (9) is provided at one end of the bushing (4) and on the side close to the packing seat (7).

2. The permanent magnet motor direct drive mixer of claim 1, wherein: A water-blocking ring (10) is provided on the main shaft (2) and close to the permanent magnet motor (1).

3. The permanent magnet motor (1) direct drive mixer according to claim 1, characterized in that: The sealing assembly (8) includes a packing layer (11) disposed between the packing seat (7) and the bushing (4), and sealing rings (12) are provided between the packing seat (7) and the bushing (4) and at both ends of the packing layer (11).

4. The permanent magnet motor direct drive mixer of claim 1, wherein: The blade (3) includes a hub (13) connected by a key to one end of the main shaft (2). The hub (13) has multiple blades (14) on its circumferential surface. The end of the main shaft (2) is provided with a hub cover (15) which is in close contact with the hub (13).

5. The permanent magnet motor direct-drive stirrer according to claim 4, characterized in that: A rubber ring (16) is provided between the end face of the hub cap (15) and one end face of the hub (13).

6. The permanent magnet motor direct drive mixer of claim 1, wherein: The mechanical seal assembly (6) includes an outer stationary ring seat (17) disposed in the mechanical seal base (5), an outer stationary ring (18) disposed in the outer stationary ring seat (17), an outer moving ring seat (19) disposed at the end of the bushing (4), a moving ring (20) disposed in the outer moving ring seat (19) in contact with the outer stationary ring (18); a cylindrical body (21) is disposed at one end of the outer stationary ring seat (17), a sealing seat (22) is disposed at one end of the cylindrical body (21), an inner stationary ring seat (23) is disposed in the sealing seat (22), an auxiliary ring (24) is disposed on the bushing (4), and an inner stationary ring (25) is disposed between the auxiliary ring (24) and the bushing (4) in contact with the inner stationary ring seat (23).

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