Permanent magnet direct-drive pressure screen without transmission part

Abstract

The invention provides a permanent-magnet direct-drive pressurized screen without a transmission part, and belongs to the technical field of papermaking machinery. According to the structure, a barrel is fixedly connected to the interior of a shell, a vector permanent magnet motor is fixedly connected to the interior of the barrel, a bearing is arranged in the barrel, a main shaft of the vector permanent magnet motor is connected to the bearing, a mechanical seal is arranged at the position, penetrating through the barrel, of the main shaft of the vector permanent magnet motor, and a rotor is connected to the main shaft; a screen cylinder is fixedly connected in the shell and located on the periphery of the rotor, a channel is formed in the position, located on the periphery of the main shaft and the vector permanent magnet motor, in the barrel, and a water retaining ring is arranged at the position of a lower port of the channel. The rotor of the pressure screen is directly driven in the mode that the vector-controlled permanent magnet motor stretches out of the power shaft, the disassembly, assembly and maintenance efficiency and the equipment operation safety are improved, the coaxiality of the rotor and the screen cylinder is directly guaranteed, meanwhile, certain cost is reduced, and the technical advantages are outstanding.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of papermaking machinery, in particular to a permanent magnet direct drive pressure screen without transmission part. BACKGROUND

[0002] With the continuous development of permanent magnet technology, it has become the preferred choice for many paper companies to use permanent magnet motor as power for papermaking and pulping machinery, which not only saves energy but also facilitates speed regulation. At present, the permanent magnet motors used in pressure screens can be divided into two structures. One is to use a belt drive to directly replace a general motor with a permanent magnet motor. The second is to connect the main shaft of the permanent magnet motor with the transmission main shaft of the pressure screen through a shaft coupling for driving. However, the use of a shaft coupling not only brings certain cost, but also makes it difficult to guarantee the coaxiality of the rotor and the screen drum. In addition, the current transmission structure is still relatively complex, and the installation and disassembly are relatively cumbersome. When maintaining, the pressure screen needs to be oiled and other operations, which is low in efficiency and occupies working hours. In addition, the too complex transmission structure is not conducive to ensuring the safe operation of the pressure screen. SUMMARY

[0003] The technical problem to be solved by the present application is how to design a permanent magnet direct drive pressure screen without transmission part.

[0004] To achieve the above technical purpose, the present application adopts the following technical scheme: A permanent magnet direct drive pressure screen without transmission part, comprising a shell, a vector permanent magnet motor, a cylinder, a bearing, a main shaft, a mechanical seal, a rotor, a screen drum, a channel and a water retaining ring, wherein the cylinder is fixedly connected inside the shell, the vector permanent magnet motor is fixedly connected inside the cylinder, the bearing is arranged inside the cylinder, the main shaft of the vector permanent magnet motor is connected to the bearing, the mechanical seal is arranged at the position where the main shaft of the vector permanent magnet motor penetrates the cylinder, the rotor is connected to the main shaft, the screen drum is fixedly connected inside the shell and located outside the periphery of the rotor, the channel is formed inside the cylinder at the position where the main shaft and the periphery of the vector permanent magnet motor are located, and the water retaining ring is arranged at the lower end of the channel.

[0005] Preferably, the water retaining ring is fixedly connected to the outer wall of the vector permanent magnet motor.

[0006] Preferably, the vector permanent magnet motor is fixedly connected to the flange inside the shell through the flange.

[0007] Preferably, a compression ring is fixedly connected to the upper end of the cylinder, a sealing ring is arranged at the bottom end of the compression ring, and the mechanical seal is arranged between the outer edge of the main shaft and the inner edge of the compression ring.

[0008] Preferably, the base is further included, and the shell is fixedly connected to the base.

[0009] In the above technical solution, the shell is the outer structure of the pressure screen, used for housing and bearing; the vector permanent magnet motor can be a conventional commercially available product, and the main shaft is an existing component, both forming the power part of the pressure screen; the cylinder located inside the shell is used to construct an independent space within the shell. This independent space serves two purposes: firstly, it is used to install the vector permanent magnet motor, and secondly, it serves as a bearing chamber for bearings. This independent space isolates the vector permanent magnet motor, bearings, and other structures from the material, ensuring they remain in a dry state; the bearings bear the force, ensuring smooth rotor rotation and maintaining a stable gap between the rotor and the screen drum; the mechanical seal located at the top of the cylinder acts as a seal between the main shaft and the cylinder, preventing material from entering the cylinder; the rotor and screen drum can be conventional structures; inside the cylinder, the channel located around the vector permanent magnet motor and the main shaft can be used for pipe laying, and secondly, it serves for slurry discharge when the mechanical seal leaks; the water-blocking ring acts as a barrier, ensuring the safety of the motor to a certain extent.

[0010] This invention provides a permanent magnet direct-drive pressure screen that eliminates the need for a transmission component. The technical solution involves directly fixing a permanent magnet motor with a drive shaft to the inner flange of the pressure screen housing via a flange. The permanent magnet motor adopts an extended drive shaft structure, meaning there is a protruding cylindrical body at the top of the motor. Bearings are fixed inside the cylinder via bearing chambers, and the bearings can bear the force, ensuring smooth rotor rotation and maintaining the clearance between the rotor and the screen drum. Compared to structures using couplings, this method saves costs and improves the coaxiality of the rotor and screen drum because it uses only one main shaft and eliminates the need for a coupling. The rotor is directly fixed to the motor main shaft, and a sealing structure at the top ensures the motor remains dry. The cylinder's interior is designed with channels to accommodate sealing water pipes and bearing oil pipes, and also allows for slurry drainage in case of mechanical seal leakage. A water-retaining ring structure is installed at the bottom of the motor to ensure its safety.

[0011] As a permanent magnet direct-drive pressure screen that does not require a transmission component, this invention uses a vector-controlled permanent magnet motor extending from the power shaft to directly drive the pressure screen rotor, achieving high efficiency, energy saving, and easy installation. Compared with existing technologies, the technical advantages of this invention are also reflected in the following aspects: 1. Compared to conventional motors that use couplings to connect the main shaft, this design offers higher efficiency. Efficiency increases with each bearing saved.

[0012] 2. The coaxiality is guaranteed, which reduces the impact of poor coupling alignment or belt tension on the main shaft, and directly ensures the coaxiality of the rotor and screen drum.

[0013] 3. Due to its simple structure, it is easy to install and disassemble, saving time and effort.

[0014] 4. The safety of the pressure screen is improved due to the elimination of the transmission components. The pressure screen does not require oiling; only the bearings inside the permanent magnet motor need lubrication, greatly improving worker efficiency.

[0015] 5. A motor junction box can be designed for the pressure screen to facilitate motor disassembly. During maintenance, simply disconnect the junction box to remove the motor. Attached Figure Description

[0016] Fig. 1 This is a cross-sectional view of the present invention; Fig. 2 This is the first perspective view of the present invention; Fig. 3 This is the second perspective view of the present invention; Fig. 4 This is a perspective view of the present invention; In the picture: Detailed Implementation

[0017] The specific embodiments of the present invention will be described in detail below. To avoid excessive and unnecessary detail, well-known structures or functions will not be described in detail in the following embodiments. The approximate language used in the following embodiments is for quantitative purposes, indicating that a certain degree of variation in quantity is permissible without changing the basic function. Unless otherwise defined, the technical and scientific terms used in the following embodiments have the same meaning as commonly understood by those skilled in the art to which this invention pertains.

[0018] Example 1 A permanent magnet direct-drive pressure screen that does not require a transmission component, such as Figs. 1-4 As shown, the device includes a housing 1, a vector permanent magnet motor 2, a cylinder 3, a bearing 4, a main shaft 5, a mechanical seal 6, a rotor 7, a screen drum 8, a channel 9, and a water-blocking ring 10. The cylinder 3 is fixedly connected inside the housing 1, the vector permanent magnet motor 2 is fixedly connected inside the cylinder 3, the bearing 4 is located inside the cylinder 3, the main shaft 5 of the vector permanent magnet motor 2 is connected to the bearing 4, the mechanical seal 6 is located on the main shaft 5 of the vector permanent magnet motor 2 passing through the cylinder 3, the rotor 7 is connected to the main shaft 5, the screen drum 8 is fixedly connected inside the housing 1, the screen drum 8 is located on the outer periphery of the rotor 7, and a channel 9 is formed inside the cylinder 3 at the position on the outer periphery of the main shaft 5 and the vector permanent magnet motor 2. A water-blocking ring 10 is provided at the lower end of the channel 9.

[0019] In the above technical solution, the shell 1 is the outer shell structure of the pressure screen, used for housing and bearing; the vector permanent magnet motor 2 can be a conventional commercially available product, and the main shaft 5 is an existing component, both of which are the power parts of the pressure screen; the cylinder 3 located inside the shell 1 is used to construct an independent space inside the shell 1. This independent space is used to install the vector permanent magnet motor 2 on the one hand, and to serve as a bearing chamber for installing the bearing 4 on the other hand. This independent space isolates the vector permanent magnet motor 2, bearing 4 and other structures from the material, ensuring that they are in a dry state; the bearing 4 is used to bear the force, ensuring that the rotor 7 rotates smoothly and ensuring a stable gap between the rotor 7 and the screen drum 8; the mechanical seal 6 located at the top of the cylinder 3 is used to seal between the main shaft 5 and the cylinder 3, thereby preventing material from entering the interior of the cylinder 3; the rotor 7 and the screen drum 8 can be conventional structures; inside the cylinder 3, the channel 9 located on the outer periphery of the vector permanent magnet motor 2 and the main shaft 5 can be used for pipe laying on the one hand, and on the other hand, when the mechanical seal 6 leaks, the channel 9 is used for slurry discharge; the water-blocking ring 10 is used to block and ensure the safety of the motor to a certain extent.

[0020] Example 2 A permanent magnet direct-drive pressure screen that does not require a transmission component, such as Figs. 1-4 As shown, the system includes a housing 1, a vector permanent magnet motor 2, a cylindrical body 3, a bearing 4, a main shaft 5, a mechanical seal 6, a rotor 7, a screen drum 8, a channel 9, and a water-retaining ring 10. The cylindrical body 3 is fixedly connected inside the housing 1, and the vector permanent magnet motor 2 is fixedly connected inside the cylindrical body 3. The bearing 4 is located inside the cylindrical body 3, and the main shaft 5 of the vector permanent magnet motor 2 is connected to the bearing 4. A mechanical seal 6 is located on the main shaft 5, passing through the cylindrical body 3, and the rotor 7 is connected to the main shaft 5. The screen drum 8 is fixedly connected inside the housing 1, located on the outer periphery of the rotor 7. A channel 9 is formed inside the cylindrical body 3, located on the outer periphery of the main shaft 5 and the vector permanent magnet motor 2. A water-retaining ring 10 is located at the lower end of the channel 9. The water-retaining ring 10 is fixedly connected to the outer wall of the vector permanent magnet motor 2. The vector permanent magnet motor 2 is fixedly connected to a flange inside the housing 1 via a flange. A pressure ring is fixedly connected to the upper end of the cylinder 3, and a sealing ring is pressed onto the bottom end of the pressure ring. A mechanical seal 6 is disposed between the outer edge of the main shaft 5 and the inner edge of the pressure ring. A base is also included, and the housing 1 is fixedly connected to the base.

[0021] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the scope of the present invention should be included within the protection scope of the present invention.

Claims

1. A permanent magnet direct-drive pressure screen that does not require a transmission component, characterized in that... The device includes a housing (1), a vector permanent magnet motor (2), a cylinder (3), a bearing (4), a main shaft (5), a mechanical seal (6), a rotor (7), a screen drum (8), a channel (9), and a water-blocking ring (10). The cylinder (3) is fixedly connected inside the housing (1), the vector permanent magnet motor (2) is fixedly connected inside the cylinder (3), the bearing (4) is provided inside the cylinder (3), the main shaft (5) of the vector permanent magnet motor (2) is connected to the bearing (4), the mechanical seal (6) is provided at the position where the main shaft (5) of the vector permanent magnet motor (2) passes through the cylinder (3), the rotor (7) is connected to the main shaft (5), the screen drum (8) is fixedly connected inside the housing (1), the screen drum (8) is located on the outer periphery of the rotor (7), and a channel (9) is formed inside the cylinder (3) at the position on the outer periphery of the main shaft (5) and the vector permanent magnet motor (2). A water-blocking ring (10) is provided at the lower end of the channel (9).

2. A permanent magnet direct-drive pressure screen that does not require a transmission part according to claim 1, characterized in that, The water-blocking ring (10) is fixedly connected to the outer wall of the vector permanent magnet motor (2).

3. A permanent magnet direct-drive pressure screen that does not require a transmission part according to claim 1, characterized in that, The vector permanent magnet motor (2) is fixedly connected to the flange inside the housing (1) via a flange.

4. A permanent magnet direct-drive pressure screen that does not require a transmission part according to claim 1, characterized in that, A pressure ring is fixedly connected to the upper end of the cylinder (3), and a sealing ring is pressed at the bottom end of the pressure ring. A mechanical seal (6) is set between the outer edge of the main shaft (5) and the inner edge of the pressure ring.

5. A permanent magnet direct-drive pressure screen that does not require a transmission part according to claim 1, characterized in that, It also includes a base, and the housing (1) is fixedly connected to the base.

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