Magnetic ring of magnetic force pump with built-in polytetrafluoroethylene magnetic isolation strip

Abstract

The utility model discloses a kind of magnetic force pump magnetic rings of built-in polytetrafluoroethylene magnetic separation strip, belong to magnetic force pump equipment technical field, including outer rotor cylinder, inner magnet clamping mechanism and spacer sleeve, further include replacement clamping mechanism;Replacement clamping mechanism includes notch isolation ring cover detachably installed in the limit ring groove in outer rotor cylinder inner wall, and polytetrafluoroethylene magnetic separation strip is installed on notch isolation ring cover;Inner magnet clamping mechanism includes the magnetic sleeve with T-shaped slot, arc permanent magnet is installed in T-shaped slot.This utility model solves the problem that existing magnetic force pump maintenance is complex and eddy current loss is big, through the replacement clamping mechanism of quick disassembly and assembly, it can replace magnetic separation strip without disassembling outer rotor cylinder, simplify maintenance, shorten downtime;While polytetrafluoroethylene magnetic separation strip effectively suppresses eddy current, reduces energy consumption, improves transmission efficiency.

Description

Technical Field

[0001] This utility model relates to the field of magnetic pump equipment technology, and in particular to a magnetic pump magnetic ring with a built-in polytetrafluoroethylene magnetic insulating strip. Background Technology

[0002] As a type of leak-free pump, the magnetic drive pump completely isolates the pump medium from the external environment through a stationary isolation sleeve. It achieves contactless torque transmission by utilizing the magnetic coupling effect of the inner and outer magnetic rotors. Therefore, it is widely used in chemical, pharmaceutical, electroplating and other fields, especially when conveying flammable, explosive, toxic or valuable media.

[0003] In traditional magnetic pump structures, power is transmitted from a motor to an external magnetic rotor connected to the motor's output shaft. The magnetic field generated by the rotating external magnetic rotor penetrates the isolation sleeve, causing the internal magnetic rotor within the pump chamber to rotate synchronously, thus driving the impeller. To ensure structural strength and the stability of magnetic field transmission, the external magnetic rotor typically employs a cylindrical structure made of metal, i.e., an external rotor cylinder. However, when the conductive metal external rotor cylinder rotates at high speed in the alternating magnetic field generated by the permanent magnet, eddy currents are inevitably generated due to the cutting of magnetic field lines. These eddy currents not only generate heat, leading to energy loss and reducing the overall transmission efficiency of the pump, but also adversely affect the transported medium under certain temperature-sensitive operating conditions.

[0004] Furthermore, to address issues such as wear, corrosion, or magnet demagnetization that may occur during long-term operation, magnetic pumps require regular maintenance. In existing technologies, replacing internal components of the outer magnetic rotor or the permanent magnets on the inner magnetic rotor typically requires disassembling the entire pump. This is especially true when replacing the protective bushing inside the outer rotor, which often necessitates removing the entire outer rotor from the motor. The entire process is cumbersome, time-consuming, and labor-intensive, resulting in prolonged equipment downtime and significantly increasing maintenance costs.

[0005] Therefore, this utility model proposes a magnetic pump ring with a built-in polytetrafluoroethylene magnetic strip to overcome the shortcomings of the prior art. Utility Model Content

[0006] In view of the problems in the prior art, the metal outer rotor cylinder of the magnetic pump magnetic ring will generate eddy current loss in the rotating magnetic field, resulting in reduced transmission efficiency, and the replacement process of its internal key components is complicated, requiring overall disassembly and high maintenance costs. The present invention aims to provide a magnetic pump magnetic ring with an improved structure that can effectively solve the above problems, which is a magnetic pump magnetic ring with built-in polytetrafluoroethylene magnetic strip.

[0007] This utility model provides a magnetic pump magnetic ring with built-in polytetrafluoroethylene magnetic insulating strip, including: an outer rotor cylinder, an inner magnet engaging mechanism, and an isolation sleeve; as well as a replacement engaging mechanism.

[0008] The replacement locking mechanism includes a notched insulating ring and a polytetrafluoroethylene magnetic strip.

[0009] Furthermore, the inner magnet engaging mechanism is coaxially disposed inside the outer rotor cylinder, the isolation sleeve is a hollow structure and is fitted between the inner magnet engaging mechanism and the outer rotor cylinder with a radial gap; the inner wall of the outer rotor cylinder is provided with a limiting annular groove along the circumferential direction for fitting the notched isolation ring sleeve, the notched isolation ring sleeve can be axially inserted and removed into the limiting annular groove, and the polytetrafluoroethylene magnetic strip is detachably installed on the notched isolation ring sleeve.

[0010] Preferably, the outer rotor cylinder is axially fixed to the motor output end by limiting bolts.

[0011] Preferably, the notched insulating ring is circumferentially fastened to the outer rotor cylinder by a fixing bolt that passes radially through the cylinder wall of the outer rotor cylinder.

[0012] Preferably, the outer side of the PTFE magnetic strip is provided with a locking block, and the recessed insulating ring is provided with a locking slot that cooperates with the locking block; the PTFE magnetic strip is axially limited by the engagement of the locking block and the locking slot.

[0013] Preferably, the inner magnet engaging mechanism includes a magnetic shielding sleeve and an arc-shaped permanent magnet mounted on the outer surface of the magnetic shielding sleeve; the magnetic shielding sleeve is threadedly connected to the drive shaft.

[0014] Preferably, the outer surface of the magnetic shielding sleeve is provided with a T-shaped groove for mounting the arc-shaped permanent magnet.

[0015] Preferably, the inner magnet engaging mechanism further includes a sealing cover plate, which is fixed to the top of the isolation sleeve by screws; the inner side of the sealing cover plate is provided with a limiting ring for axial support, and ball bearings are provided between the limiting ring and the end face of the magnetic isolation sleeve.

[0016] Preferably, the limiting ring and the ball form a rolling friction pair, which is used to abut against the magnetic shielding sleeve to limit its axial movement.

[0017] This utility model has the following beneficial effects: 1. This utility model, by setting a detachable replacement locking mechanism, including a recessed isolation ring sleeve that can be pulled out from the outer rotor cylinder, and a polytetrafluoroethylene magnetic strip detachably installed on the recessed isolation ring sleeve, solves the problem in the prior art that after the internal components of the outer rotor cylinder of the magnetic pump are damaged, the entire outer rotor cylinder must be disassembled from the motor for repair and replacement, resulting in a complicated, time-consuming, and costly maintenance process. It achieves the technical effect of simplifying the maintenance process, shortening equipment downtime, reducing maintenance costs, and realizing quick and convenient replacement.

[0018] 2. This utility model solves the problem of high energy loss and low transmission efficiency caused by eddy currents generated in the high-speed rotating magnetic field of the metal outer rotor cylinder by setting polytetrafluoroethylene magnetic strips on the inner wall of the outer rotor cylinder and utilizing its electrical insulation properties to effectively divide the metal cylinder wall. It achieves the technical effects of effectively suppressing eddy currents, reducing energy loss, improving magnetic transmission efficiency and equipment operation stability. Attached Figure Description

[0019] Figure 1 This is a perspective view of a magnetic pump magnetic ring with a built-in polytetrafluoroethylene magnetic insulating strip proposed in this utility model. Figure 2 This is an exploded view of a magnetic pump magnetic ring with a built-in polytetrafluoroethylene magnetic insulating strip proposed in this utility model. Figure 3 This is a cross-sectional view of the outer rotor cylinder of a magnetic pump magnetic ring with a built-in polytetrafluoroethylene magnetic insulating strip, as proposed in this utility model. Figure 4 This is a cross-sectional view of the isolation sleeve of the magnetic ring of a magnetic pump with a built-in polytetrafluoroethylene magnetic insulating strip, as proposed in this utility model. Figure 5 This is an exploded view of the inner magnet engaging mechanism of the magnetic ring of a magnetic pump with a built-in polytetrafluoroethylene magnetic strip, as proposed in this utility model.

[0020] Legend: 1. Outer rotor cylinder; 2. Replacement locking mechanism; 21. Limiting annular groove; 22. Notched isolation ring sleeve; 23. PTFE magnetic shielding strip; 24. Locking block; 25. Fixing bolt; 26. Limiting bolt; 3. Inner magnet locking mechanism; 31. Magnetic shielding sleeve; 32. T-slot; 33. Arc-shaped permanent magnet; 34. Screw; 35. Drive shaft; 36. Sealing cover plate; 37. Limiting ring; 38. Ball bearing; 4. Isolation sleeve. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0022] Example: Please refer to Figures 1 to 5This utility model provides a magnetic pump magnetic ring with a built-in polytetrafluoroethylene magnetic strip, which aims to solve the problems of eddy current loss generated by the metal outer rotor cylinder of existing magnetic pumps and the complicated replacement and maintenance process of key internal components.

[0023] like Figures 1 to 5 As shown, the overall structure of a magnetic pump magnetic ring with a built-in polytetrafluoroethylene (PTFE) magnetic insulating strip includes an outer rotor cylinder 1 as the power input part, an inner magnet engaging mechanism 3 as the power output part, an isolation sleeve 4 for achieving dynamic and static sealing, and a replacement engaging mechanism 2 for installing the PTFE magnetic insulating strip 23. Specifically, the outer rotor cylinder 1 is a cylindrical structure with one open end, which is axially fixed to the output end of an external power source, i.e., a motor, by a limiting bolt 26, for transmitting rotational torque. The inner magnet engaging mechanism 3 is coaxially disposed in the internal cavity of the outer rotor cylinder 1. The isolation sleeve 4 is a thin-walled cylinder with a closed bottom, which is fixedly sleeved between the inner magnet engaging mechanism 3 and the outer rotor cylinder 1 with a radial gap. The isolation sleeve 4 spatially isolates the rotating outer rotor cylinder 1 from the equally rotating inner magnet engaging mechanism 3, thereby achieving contactless torque transmission. In this embodiment, the replacement engaging mechanism 2 is installed on the inner wall of the outer rotor cylinder 1 and includes an annular notched isolation ring. 22 and multiple PTFE magnetic strips 23 evenly distributed circumferentially; to facilitate easy installation and removal of the locking mechanism 2, a limiting annular groove 21 is machined circumferentially on the inner wall of the outer rotor cylinder 1. The notched isolation ring 22, as an independent annular component, has an outer diameter that matches the groove diameter of the limiting annular groove 21, allowing the notched isolation ring 22 to be axially inserted into or removed from the limiting annular groove 21; after installation, the fixing bolt 25 passes radially through the cylinder wall of the outer rotor cylinder 1 and screws into the notched isolation ring 22. In the threaded hole, a circumferential fastening connection is achieved between the outer rotor cylinder 1 and the recessed isolation ring 22, preventing relative rotation between them; furthermore, each polytetrafluoroethylene magnetic strip 23 has a protruding locking block 24 on its outer side, and the recessed isolation ring 22 has a corresponding locking slot that matches the shape and position of the locking block 24. The polytetrafluoroethylene magnetic strip 23 achieves a stable axial limit and allows for quick assembly and disassembly through the interlocking sliding connection between its locking block 24 and the locking slot of the recessed isolation ring 22.

[0024] Please refer to Figure 4 and Figure 5The main body of the inner magnet engaging mechanism 3 is a magnetic shielding sleeve 31, which has a through hole inside and is fixedly connected to the drive shaft 35 by threads to transmit rotational motion to the drive shaft 35. Multiple T-shaped grooves 32 are axially formed on the outer circumferential surface of the magnetic shielding sleeve 31. These T-shaped grooves 32 are used to install arc-shaped permanent magnets 33. The cross-sectional shape of the arc-shaped permanent magnets 33 is designed to be T-shaped to fit the T-shaped grooves 32, allowing multiple arc-shaped permanent magnets 33 to slide axially into their respective T-shaped grooves 32 and achieve radially secure positioning. Adjacent arc-shaped permanent magnets 33 are arranged with specific alternating magnetic poles to form a complete closed magnetic circuit. This sliding fit structure between the T-shaped grooves 32 and the arc-shaped permanent magnets 33 ensures that the arc-shaped permanent magnets 33 will not fall off during high-speed rotation, and also allows for more precise positioning when needed. When replacing, the old permanent magnet can be easily removed and the new permanent magnet installed by simply pulling out the inner magnet engaging mechanism 3 as a whole along the T-slot 32. In order to axially position the inner magnet engaging mechanism 3 and reduce transmission energy consumption, a sealing and support assembly is also provided at the top of the isolation sleeve 4, including a sealing cover plate 36 fixedly connected to the top of the isolation sleeve 4 by screws 34. A limiting ring 37 is fixed on the inner side of the sealing cover plate 36, and multiple balls 38 are provided between the limiting ring 37 and the upper end face of the magnetic shielding sleeve 31. The limiting ring 37 and the balls 38 together form a rolling friction pair. The rolling friction pair is used to abut against the magnetic shielding sleeve 31. While effectively restricting the axial movement of the inner magnet engaging mechanism 3 as a whole, rolling friction replaces sliding friction, which significantly reduces energy loss during rotation.

[0025] Please refer to Figure 3 To stably mount the entire magnetic pump ring onto the power equipment, the closed end of the outer rotor cylinder 1 is axially fixed to the external motor output end via limiting bolts 26. To ensure the circumferential stability of the replacement locking mechanism 2, after the recessed isolation ring sleeve 22 is inserted into the limiting annular groove 21, the fixing bolts 25 are radially screwed into the threaded hole in the cylinder wall of the outer rotor cylinder 1 and finally abut against or screwed into the recessed isolation ring sleeve 22, achieving circumferential fastening between the two. Please refer to... Figure 5 For the assembly of the inner magnet engaging mechanism 3, its main magnetic shielding sleeve 31 and the transmission shaft 35 are connected and fixed by precision threads to ensure that there is no relative rotation between the two when transmitting torque; multiple arc-shaped permanent magnets 33 slide into the T-shaped groove 32 on the outer wall of the magnetic shielding sleeve 31 one by one along the axial direction, and the structure of the T-shaped groove 32 forms a reliable radial limit on the two sides of the arc-shaped permanent magnets 33. Please refer to Figure 4In order to complete the final assembly and positioning of the inner magnet engaging mechanism 3, the sealing cover 36 is fastened to the top opening flange of the isolation sleeve 4 by multiple screws 34. The inner side of the sealing cover 36 is integrally formed or fixedly connected with a limiting ring 37. The limiting ring 37 acts as a stationary bearing seat and is filled with multiple balls 38 between it and the rotating end face of the magnetic shielding sleeve 31. These balls 38 are limited within the annular raceway of the limiting ring 37, thereby forming a rolling friction pair structure that can withstand axial force.

[0026] Working principle: First, the locking mechanism 2 is used for the stable connection between the outer rotor cylinder 1 and the motor output end, and for the replacement of the PTFE magnetic shielding strip 23. The outer rotor cylinder 1 is axially fixed to the motor output end by the limiting bolt 26. The notched insulating ring 22 is circumferentially fastened to the outer rotor cylinder 1 by the fixing bolt 25. The PTFE magnetic shielding strip 23 is axially limited by the engagement of the outer locking block 24 with the notched insulating ring 22 to prevent displacement during magnetic transmission. The PTFE magnetic shielding strip 23 is then replaced. When the magnetic strip 23 is in place, loosen the fixing bolt 25 to release the circumferential fixation between the outer rotor cylinder 1 and the recessed isolation ring 22, pull the recessed isolation ring 22 out of the limiting annular groove 21, push the magnetic strip to be replaced to separate the locking block 24 from the locking slot, remove the old magnetic strip, fit the locking block 24 of the new magnetic strip into the locking slot, insert the recessed isolation ring 22 with the new magnetic strip into the outer rotor cylinder 1, and tighten the fixing bolt 25 to complete the reset. The process does not require disassembling the connection between the outer rotor cylinder 1 and the motor. Furthermore, through the inner magnet engaging mechanism 3, the arc-shaped permanent magnet 33 is positioned by the T-groove 32 on the outer surface of the magnetic shielding sleeve 31. Adjacent permanent magnets are arranged with specific alternating magnetic poles to form a closed magnetic circuit. The magnetic shielding sleeve 31 is fixed to the drive shaft 35 by a threaded connection. The sealing cover plate 36 is fixed to the top of the isolation sleeve 4 by screws 34. Its inner limiting ring 37 and the ball 38 form a rolling friction pair to reduce transmission energy consumption. When replacing the arc-shaped permanent magnet 33, loosen the screws 34 and remove the sealing cover plate 36, the limiting ring 37 and the ball. 38. The drive shaft 35 and the magnetic shielding sleeve 31 are pulled out of the isolation sleeve 4 as a whole. When the parts need to be replaced separately, the threaded connection between the two is separated by rotation. The old permanent magnet is pulled out along the T-slot 32 and the new permanent magnet is inserted. When the power is transmitted, the motor drives the outer rotor cylinder 1 to rotate. Its magnetic field penetrates the isolation sleeve 4 and acts on the arc-shaped permanent magnet 33, which drives the magnetic shielding sleeve 31 to rotate synchronously. The drive shaft 35 is driven to rotate through the threaded connection to achieve contactless transmission. The sealing cover plate 36 restricts the axial movement of the magnetic shielding sleeve 31 to ensure stability.

Claims

1. A magnetic pump ring with a built-in polytetrafluoroethylene magnetic shielding strip, comprising: Outer rotor cylinder (1); An inner magnet engaging mechanism (3) is coaxially disposed inside the outer rotor cylinder (1); and an isolation sleeve (4) is a hollow structure and is fitted between the inner magnet engaging mechanism (3) and the outer rotor cylinder (1) with a radial gap. Its features are, The magnetic pump magnetic ring also includes a replacement locking mechanism (2), which includes a notched insulating ring sleeve (22) and a polytetrafluoroethylene magnetic shielding strip (23). The inner wall of the outer rotor cylinder (1) is provided with a limiting annular groove (21) along the circumferential direction for assembling the recessed isolation ring (22). The notched insulating ring (22) can be axially inserted and removed into the limiting annular groove (21), and the polytetrafluoroethylene magnetic strip (23) can be detachably installed on the notched insulating ring (22).

2. The magnetic pump ring with a built-in polytetrafluoroethylene magnetic strip as described in claim 1, characterized in that, The outer rotor cylinder (1) is axially fixed to the motor output end by limiting bolts (26).

3. The magnetic pump ring with a built-in polytetrafluoroethylene magnetic strip as described in claim 1, characterized in that, The notched insulating ring (22) is radially passed through the wall of the outer rotor cylinder (1) and circumferentially fastened to the outer rotor cylinder (1) by a fixing bolt (25).

4. The magnetic pump ring with a built-in polytetrafluoroethylene magnetic strip as described in claim 1, characterized in that, The outer side of the PTFE magnetic strip (23) is provided with a locking block (24), and the notched insulating ring (22) is provided with a locking slot that cooperates with the locking block (24). The PTFE magnetic strip (23) is axially limited by the engagement of the locking block (24) and the locking slot.

5. The magnetic pump ring with a built-in polytetrafluoroethylene magnetic strip as described in claim 1, characterized in that, The inner magnet engaging mechanism (3) includes a magnetic shielding sleeve (31) and an arc-shaped permanent magnet (33) installed on the outer surface of the magnetic shielding sleeve (31); the magnetic shielding sleeve (31) is threadedly connected to the drive shaft (35).

6. A magnetic pump ring with a built-in polytetrafluoroethylene magnetic strip as described in claim 5, characterized in that, The outer surface of the magnetic shielding sleeve (31) is provided with a T-shaped groove (32) for mounting the arc-shaped permanent magnet (33).

7. A magnetic pump ring with a built-in polytetrafluoroethylene magnetic strip as described in claim 5, characterized in that, The inner magnet engaging mechanism (3) also includes a sealing cover plate (36), which is fixed to the top of the isolation sleeve (4) by screws (34). The inner side of the sealing cover plate (36) is provided with a limiting ring (37) for axial support, and a ball bearing (38) is provided between the limiting ring (37) and the end face of the magnetic shielding sleeve (31).

8. A magnetic pump ring with a built-in polytetrafluoroethylene magnetic strip as described in claim 7, characterized in that, The limiting ring (37) and the ball (38) form a rolling friction pair, which is used to abut against the magnetic sleeve (31) to limit its axial movement.

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