A magnetic fluid seal device that is easy to repair

Abstract

The utility model relates to sealing device technical field, and disclose a kind of magnetic fluid sealing device convenient for maintenance, the magnetic fluid sealing device convenient for maintenance, including equipment bucket, equipment bucket is fixedly installed with bucket cover, transmission part is provided outside equipment bucket, sealing assembly is provided on the bucket cover, and the sealing assembly includes fastener.The magnetic fluid sealing device convenient for maintenance, by setting sealing assembly, when cooperation transmission part makes that rotating shaft rotates inside sealing bearing, play preliminary sealing, cooperate sealing ring further sealing, cooperate pole shoe, permanent magnet and magnetic ring and magnetic fluid, so that rotating shaft stable rotation, can further prevent medium leakage inside equipment bucket, improve sealing, cooperate fastener on bucket cover, it is convenient to dismount sealing bearing, cooperate connecting rod and nut and be convenient for dismounting pole shoe, permanent magnet and magnetic ring, to improve the convenience of use, it is convenient to repair.

Description

Technical Field

[0001] This utility model relates to the field of sealing device technology, specifically to a magnetic fluid sealing device that is easy to maintain. Background Technology

[0002] Magnetic fluid sealing technology, as an advanced sealing method that combines magnetic and fluid dynamics characteristics, has been widely used in many technical fields such as petrochemicals, aerospace, biomedicine, and precision machinery due to its core advantages of zero leakage, low friction, and long service life. It is especially suitable for equipment with strict sealing performance requirements and that needs to avoid media contamination or external impurities, such as reaction vessels, vacuum equipment, and high-speed shaft transmission systems.

[0003] However, existing magnetic fluid sealing devices still have significant shortcomings in practical applications, which restrict their further promotion and use. On the one hand, the sealing core components of existing devices (such as pole shoes, permanent magnets, magnetic rings, etc.) mostly adopt integrated fixed structures or complex welding and bonding connection methods. When it is necessary to maintain or replace the sealing components or clean the magnetic fluid, the entire device shell and transmission structure need to be disassembled, which is cumbersome and time-consuming.

[0004] On the other hand, existing devices generally lack targeted heat dissipation designs. Under high-speed rotation of the shaft, frictional dissipation between the shaft and the sealing components generates a large amount of heat, causing the internal temperature of the device to rise. As the temperature rises, the magnetic fluid will experience problems such as magnetic attenuation, viscosity reduction, and accelerated evaporation of the base liquid. This will not only weaken the stability of the "liquid sealing ring" and lead to a decrease in sealing performance, but also shorten the service life of the magnetic fluid and sealing components, and even cause faults such as insufficient pressure resistance and sealing failure. It cannot effectively guarantee the sealing performance and service life of the device. In view of this, we propose a magnetic fluid sealing device that is easy to maintain. Utility Model Content

[0005] The purpose of this invention is to provide a magnetic fluid sealing device that is easy to maintain, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A magnetic fluid sealing device that is easy to maintain includes a tank, a lid fixedly mounted on the tank, a transmission component disposed on the outside of the tank, and a sealing assembly disposed on the lid. The sealing assembly includes: Fasteners are used to fix one end of a sealed bearing to the center of the bucket lid. A rotating shaft is fixedly installed inside the center of the sealed bearing. A cylinder is fixedly installed at the end of the sealed bearing away from the bucket lid. A through arc-shaped groove is opened on the arc-shaped sidewall of the cylinder. The transmission component passes through the arc-shaped groove. A connecting rod is fixedly connected to one end of the sealing bearing outer wall. The connecting rod is fitted with pole shoes and a permanent magnet. There are two pole shoes, and each pole shoe is threaded onto both ends of the permanent magnet. The outer walls of the two pole shoes are tightly fitted to the outer walls of both ends of the permanent magnet. The outer wall of one pole shoe is fitted to the outer wall of the sealing bearing. A magnetic ring is fitted around the permanent magnet and the two pole shoes. The pole shoes and the permanent magnet are both fitted around the outside of the rotating shaft, forming a sealing gap with the rotating shaft. The magnetic ring is used to concentrate the magnetic field at the sealing gap to form a strong magnetic field region. The magnetic fluid has fluidity and magnetism. Under the action of the magnetic field, it will be attracted and fixed in the strong magnetic field region to form a stable "liquid sealing ring". The connecting rod is threaded with a nut at the end away from the sealing bearing, and a sealing ring is fitted inside the sealing bearing on the side near the pole shoe.

[0007] In a further embodiment, the transmission component includes two transmission pulleys and a transmission belt outside the two pulleys. One transmission pulley is fixedly mounted outside the shaft, and the other transmission pulley is fixedly mounted on the output shaft of the drive motor, thereby enabling the shaft to rotate more effectively.

[0008] In a further embodiment, the fastener is a bolt, and multiple sets of the fastener are provided.

[0009] In a further embodiment, the circular cross-sections of the equipment barrel, barrel lid, sealed bearing, rotating shaft, cylinder, pole shoe, permanent magnet, magnetic ring, and sealing ring are coaxial.

[0010] In a further embodiment, multiple sets of connecting rods and nuts are provided, and the multiple sets of connecting rods and nuts are arranged in an equally spaced circumferential array with the center of the circular cross-section of the cylinder as the array center, making the whole more stable and easier to disassemble and assemble.

[0011] In a further embodiment, a heat dissipation assembly is provided on the cylinder. The heat dissipation assembly includes an arc-shaped heat dissipation plate, which is snapped into the arc-shaped groove. The arc-shaped heat dissipation plate has through-holes and slots, and the transmission belt passes through the slots to avoid motion interference.

[0012] In a further embodiment, a fixing block is fixedly installed inside the end of the cylinder away from the sealing bearing, a servo motor is fixedly installed on the outer wall of the fixing block, one end of a rotating rod is fixedly installed at the output end of the servo motor, and a fan blade is fixedly installed at the other end of the rotating rod for better heat dissipation and cooling.

[0013] Compared with the prior art, this utility model provides a magnetic fluid sealing device that is easy to maintain, and has the following beneficial effects: 1. This easy-to-maintain magnetic fluid sealing device, in order to improve the overall sealing performance and ease of maintenance, incorporates a sealing assembly. When the shaft rotates within the sealed bearing in conjunction with the transmission components, it achieves initial sealing. The sealing ring further enhances the sealing. Combined with the pole shoes, permanent magnets, magnetic rings, and magnetic fluid, the shaft rotates stably while further preventing leakage of the medium inside the equipment tank, thus improving sealing performance. The fasteners on the tank lid facilitate the disassembly and assembly of the sealed bearing, and the connecting rod and nut facilitate the disassembly and assembly of the pole shoes, permanent magnets, and magnetic rings, thereby improving ease of use and maintenance.

[0014] 2. This easy-to-maintain magnetic fluid sealing device, in order to improve the overall pressure resistance and sealing life of the device, is equipped with heat dissipation components, combined with arc-shaped heat dissipation and through grooves. In addition to not affecting the normal operation of the transmission components, it can also prevent external impurities from entering the inside of the cylinder. When the servo motor on the fixed block is started, the rotating rod drives the fan blade to rotate, thereby dissipating heat from the inside of the cylinder. Thus, when the high-speed rotation of the shaft causes a large amount of frictional dissipation, which increases the heat generation and temperature of the magnetic fluid, it avoids the phenomenon of decreased magnetism, decreased viscosity, and increased evaporation of the base liquid in the magnetic fluid, thereby improving the overall pressure resistance and sealing life of the device. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the equipment barrel of this utility model; Figure 3 This is a schematic diagram of the connection of a portion of the sealing assembly of this utility model; Figure 4 This is a cross-sectional view of part of the structure of this utility model; Figure 5 This is an exploded cross-sectional view of part of the structure of this utility model; Figure 6 This is a schematic diagram of the connection of a sealing component from another perspective of this utility model; Figure 7 This is an exploded cross-sectional view of part of the structure of this utility model from another perspective.

[0016] Explanation of icon numbers: 1. Equipment container; 2. Container lid; 3. Transmission components; 4. Sealing assembly; 41. Fastener; 42. Sealed bearing; 43. Shaft; 44. Cylinder; 45. Arc groove; 46. Connecting rod; 47. Pole shoe; 48. Permanent magnet; 49. Magnetic ring; 410. Nut; 411. Sealing ring; 5. Heat dissipation components; 51. Arc-shaped heat sink; 52. Through slot; 53. Fixing block; 54. Servo motor; 55. Rotating rod; 56. Fan blade. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] In this application, the term "above" indicates the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. It is primarily used to better describe this application and its embodiments, and is not intended to limit the indicated device, element, or component to having a specific orientation, or to construct and operate in a specific orientation. Furthermore, the term "above" may also be used in certain circumstances to indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances.

[0019] Please see Figures 1-7 This utility model provides a technical solution: A magnetic fluid sealing device that is easy to maintain includes a tank 1, a lid 2 fixedly installed on the tank 1, and a transmission component 3 provided on the outside of the tank 1.

[0020] In one embodiment of this utility model, a sealing component 4 is provided on the bucket lid 2. The sealing component 4 includes fasteners 41, which are bolts. Four sets of fasteners 41 are provided. One end of a sealing bearing 42 is fixedly installed at the center of the bucket lid 2 through the fasteners 41. A rotating shaft 43 (made of non-magnetic material, such as stainless steel, to prevent the magnetic field from being diverted by the shaft) is fixedly installed at the center inside the sealing bearing 42. In addition, the transmission component 3 includes two transmission pulleys and a transmission belt outside the two. One of the transmission pulleys is fixedly installed outside the rotating shaft 43. Another transmission pulley is fixedly mounted on the output shaft of the drive motor, thereby enabling the rotating shaft 43 to rotate better. A cylinder 44 is fixedly mounted on the end of the sealed bearing 42 away from the bucket cover 2. The arc-shaped side wall of the cylinder 44 has a through arc-shaped groove 45. The transmission component 3 passes through the arc-shaped groove 45. One end of the connecting rod 46 is fixedly connected to the outer wall of the sealed bearing 42. The connecting rod 46 is fitted with a pole shoe 47 (an annular component made of magnetic material) and a permanent magnet 48 (such as a neodymium iron boron magnet). There are two pole shoes 47, and the two pole shoes 47 are threadedly mounted on the outside. The two pole shoes 47 are mounted at both ends of the permanent magnet 48. Their outer walls are tightly fitted to the outer walls of both ends of the permanent magnet 48 for easy assembly and disassembly. One pole shoe 47's outer wall is fitted to the outer wall of the sealed bearing 42. A magnetic guide ring 49 (such as a soft iron ring) is fitted around the permanent magnet 48 and the two pole shoes 47. Both the pole shoes 47 and the permanent magnet 48 are fitted around the rotating shaft 43, forming a sealing gap (0.1-0.5mm) with the shaft. The magnetic guide ring 49 is used to concentrate the magnetic field at this sealing gap, forming a strong magnetic field region. The connecting rod 46 is located away from the sealed bearing 42. One end is threaded with a nut 410. The sealed bearing 42 is fitted with a sealing ring 411 on the side near the pole shoe 47. In addition, the circular cross-section centers of the equipment barrel 1, barrel cover 2, sealed bearing 42, rotating shaft 43, cylinder 44, pole shoe 47, permanent magnet 48, magnetic ring 49 and sealing ring 411 are coaxial. Furthermore, multiple sets of connecting rods 46 and nuts 410 are provided, and the multiple sets of connecting rods 46 and nuts 410 are arranged in an equally spaced circumferential array with the center of the circular cross-section of cylinder 44 as the array center, making the whole more stable and easy to disassemble and assemble.

[0021] In this embodiment, to fundamentally improve the overall sealing performance of the device and reduce maintenance difficulty, the sealing component 4, one of the core functional modules of the device, achieves multi-layer sealing and convenient maintenance through the collaborative action of multiple parts. First, the transmission component 3, as the core of power transmission, includes two transmission pulleys that cooperate with an external transmission belt to transmit the power from the output shaft of the drive motor (not shown in the figure) to the rotating shaft 43. When the drive motor starts, the active transmission pulley rotates, driving the driven transmission pulley to rotate synchronously through the transmission belt, thereby driving the rotating shaft 43 to rotate stably inside the sealed bearing 42. During rotation, the sealed bearing 42, acting as the first line of defense, effectively prevents the medium inside the equipment tank 1 from initially leaking to the outside by engaging its internal rolling elements with the inner and outer rings, achieving a preliminary seal. Building upon this preliminary seal, the sealing ring 411 (made of a media-resistant and wear-resistant elastic material) fitted inside the sealed bearing 42 near the pole shoe 47 tightly adheres to the outer wall of the sealed bearing 42 and the pole shoe 47, filling the tiny gap between them and forming a second sealing barrier, further reducing the risk of media leakage. The permanent magnet 48 (made of neodymium iron with high magnetic energy product)... The N and S poles of the boron magnet are in close contact with the two pole shoes 47 (ring-shaped components made of magnetically conductive material) on both sides. The left pole shoe 47 receives the N pole magnetic field and the right pole shoe 47 receives the S pole magnetic field, forming an initial magnetic field path. A magnetically conductive ring 49 (made of soft iron with high magnetic permeability) is fitted around the permanent magnet 48 and the two pole shoes 47, connecting the outer edges of the two pole shoes 47 to construct an "outer ring" of a closed magnetic circuit. This concentrates the magnetic field energy in the sealed gap between the pole shoes 47 and the rotating shaft 43 (the gap width is controlled between 0.1-0.5 mm), forming a strong magnetic field region. The magnetic fluid (composed of iron oxide nanomagnetic particles, surfactants, and carrier liquid, with kerosene or silicone oil selected according to the operating environment to ensure stability) serves as the core sealing medium. Due to its combination of fluidity and magnetism, it is quickly adsorbed and fixed in a strong magnetic field area, forming a continuous and stable "liquid sealing ring". This sealing ring can rotate synchronously with the rotating shaft 43, which not only does not affect the normal rotation of the rotating shaft 43, but also completely blocks the leakage of the medium inside the equipment tank 1 through the sealing gap, achieving the third and most critical seal and greatly improving the overall sealing performance of the device.

[0022] In maintenance and disassembly scenarios, the structural design of the sealing component 4 fully considers ease of operation: four sets of fasteners 41 (using standard bolts) are set on the lid 2. After the operator removes the lid 2, they can use a wrench to loosen or tighten the fasteners 41 to quickly remove or install the sealing bearing 42 from the center of the lid 2. At the same time, multiple sets of connecting rods 46 are fixedly connected to the outer wall of the sealing bearing 42. The end of the connecting rod away from the sealing bearing 42 is threaded with the nut 410. When it is necessary to replace or maintain the pole shoe 47, permanent magnet 48, and magnetic ring 49, after removing the sealing bearing 42, the nut 410 is unscrewed, and the magnetic ring 49, permanent magnet 48, and pole shoe 47 (the two pole shoes 47 are threaded to both ends of the permanent magnet 48 respectively and can be disassembled individually) can be removed along the axial direction of the connecting rod 46. The whole process does not require special tools, which significantly reduces the difficulty of maintenance and improves the efficiency of operation.

[0023] In one embodiment of this utility model, a heat dissipation assembly 5 is provided on the cylinder 44. The heat dissipation assembly 5 includes an arc-shaped heat dissipation plate 51. The arc-shaped heat dissipation plate 51 is snapped into the arc-shaped groove 45. The arc-shaped heat dissipation plate 51 has through heat dissipation holes and through grooves 52. The transmission belt passes through the through grooves 52 to avoid motion interference. In addition, a fixing block 53 is fixedly installed inside the end of the cylinder 44 away from the sealing bearing 42. A servo motor 54 is fixedly installed on the outer wall of the fixing block 53. One end of a rotating rod 55 is fixedly installed at the output end of the servo motor 54, and a fan blade 56 is fixedly installed at the other end of the rotating rod 55 to better dissipate heat and cool the cylinder.

[0024] In this embodiment, the arc-shaped heat sink 51 is perfectly matched with the arc-shaped groove 45 on the side wall of the cylinder 44 and is engaged inside the arc-shaped groove 45. This seals the opening of the arc-shaped groove 45, preventing external dust and impurities from entering the cylinder 44 through the arc-shaped groove 45 (avoiding impurities adhering to the rotating shaft 43 or the sealing gap, thus affecting the sealing effect). At the same time, the through groove 52 on the arc-shaped heat sink 51 is compatible with the transmission belt of the transmission component 3. The transmission belt can pass through the through groove 52 to achieve power transmission, avoiding motion interference between the arc-shaped heat sink 51 and the transmission component 3, and accelerating the dissipation of heat inside the cylinder 44 through air convection, achieving initial heat dissipation. Heat dissipation is crucial. When the shaft 43 rotates at high speed, frictional dissipation between it and the sealed bearing 42, sealing ring 411, and magnetic fluid generates heat, causing the internal temperature of the cylinder 44 to rise. If the temperature continues to rise, the magnetic fluid will experience problems such as decreased magnetism (weakened magnetic field adsorption capacity, reduced sealing ring stability), decreased viscosity (the liquid sealing ring at the sealing gap is prone to breakage), and increased evaporation of the base fluid (reduced total amount of magnetic fluid, weakened sealing effect), affecting the sealing performance and service life of the device. At this time, the active heat dissipation function of the heat dissipation component 5 is activated: the solid... The servo motor 54 (selected according to the appropriate power model based on heat dissipation requirements) fixed on the outer wall of the fixed block 53 starts after receiving a temperature monitoring signal (can be used with a temperature sensor, here is conventional control logic). The output shaft of the servo motor 54 drives the fixedly connected rotating rod 55 to rotate at high speed. The fan blade 56 fixed at the other end of the rotating rod 55 (adopting a streamlined blade design to improve airflow generation efficiency) rotates synchronously. During the rotation of the fan blade 56, a directional airflow is formed inside the cylinder 44: the airflow is drawn in from the end of the cylinder 44 near the servo motor 54 (this opening is not shown in the figure), quickly takes away heat, and then carries away... The hot airflow is discharged to the outside of the cylinder 44 through the heat dissipation holes on the arc-shaped heat sink 51. Through this active air cooling process, the internal temperature of the cylinder 44 can be quickly reduced to the optimal operating temperature range of the magnetic fluid (usually -20℃ to 80℃, depending on the type of magnetic fluid). This effectively avoids the performance degradation of the magnetic fluid due to high temperature. At the same time, the stable operating temperature can ensure the stable magnetic field performance of the pole shoe 47 and the permanent magnet 48, ensure the strength of the strong magnetic field area at the sealing gap, and ensure that the sealing ring formed by the magnetic fluid always maintains good sealing performance, thereby improving the overall pressure resistance and sealing life of the device.

[0025] In this application, the equipment barrel 1, barrel lid 2 and transmission component 3 are existing equipment, and only the connection relationship between them and the sealing device body will be shown. The standard parts used in this application can all be purchased from the market. The specific connection methods of each part are all connected by conventional methods such as riveting and welding that are mature in the prior art. The standard parts all adopt conventional models in the prior art, and will not be described in detail here.

[0026] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A magnetic fluid sealing device convenient for maintenance, comprising a device barrel (1), a barrel cover (2) is fixedly installed on the device barrel (1), a transmission member (3) is arranged outside the device barrel (1), characterized in that: A sealing assembly (4) is provided on the bucket lid (2), the sealing assembly (4) comprising: Fastener (41), one end of a sealed bearing (42) is fixedly installed at the center of the bucket lid (2) by fastener (41), a rotating shaft (43) is fixedly installed at the center inside the sealed bearing (42), a cylinder (44) is fixedly installed at the end of the sealed bearing (42) away from the bucket lid (2), and an arc-shaped groove (45) is opened on the arc-shaped side wall of the cylinder (44), and the transmission component (3) passes through the arc-shaped groove (45). Connecting rod (46), the outer wall of the sealed bearing (42) is fixedly connected to one end of the connecting rod (46), the connecting rod (46) is fitted with a pole shoe (47) and a permanent magnet (48), there are two pole shoes (47), and the two pole shoes (47) are respectively threaded to the two ends of the permanent magnet (48), the outer walls of the two pole shoes (47) are tightly fitted to the outer walls of the two ends of the permanent magnet (48), the outer wall of one pole shoe (47) is fitted to the outer wall of the sealed bearing (42), the permanent magnet (48) and the two pole shoes (47) are fitted with a magnetic ring (49), the pole shoes (47) and the permanent magnet (48) are both fitted to the outside of the rotating shaft (43), forming a sealing gap with the rotating shaft (43), the magnetic ring (49) is used to concentrate the magnetic field at the sealing gap to form a strong magnetic field area, the magnetic fluid has fluidity and magnetism, and under the action of the magnetic field, it will be attracted and fixed in the strong magnetic field area to form a stable "liquid sealing ring"; Nut (410), the end of the connecting rod (46) away from the sealed bearing (42) is threaded with a nut (410), and the sealed bearing (42) is fitted with a sealing ring (411) on the side near the pole shoe (47).

2. The magnetic fluid seal assembly of claim 1, wherein: The transmission component (3) includes two transmission pulleys and a transmission belt outside the two pulleys.

3. The magnetic fluid seal assembly of claim 1, wherein: The fastener (41) is a bolt.

4. The magnetic fluid seal assembly of claim 1, wherein: The circular cross-sections of the equipment barrel (1), barrel cover (2), sealed bearing (42), rotating shaft (43), cylinder (44), pole shoe (47), permanent magnet (48), magnetic ring (49), and sealing ring (411) are coaxial.

5. The magnetic fluid seal assembly of claim 4, wherein: The connecting rod (46) and nut (410) are provided in multiple sets, and the multiple sets of connecting rod (46) and nut (410) are arranged in a circular array with equal spacing around the center of the circular cross section of the cylinder (44).

6. The magnetic fluid seal assembly of claim 2, wherein: The cylinder (44) is provided with a heat dissipation assembly (5), which includes an arc-shaped heat dissipation plate (51). The arc-shaped heat dissipation plate (51) is snapped into the arc-shaped groove (45). The arc-shaped heat dissipation plate (51) has through heat dissipation holes and through grooves (52), and the transmission belt passes through the through grooves (52).

7. The magnetic fluid seal assembly of claim 6, wherein: A fixing block (53) is fixedly installed inside the end of the cylinder (44) away from the sealing bearing (42). A servo motor (54) is fixedly installed on the outer wall of the fixing block (53). One end of a rotating rod (55) is fixedly installed at the output end of the servo motor (54), and a fan blade (56) is fixedly installed at the other end of the rotating rod (55).

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