Magnetic seal for doctor blade filter

Abstract

The magnetic sealing device of the scraper filter is characterized in that the bearing seat body is a cylindrical structure with a stepped through hole, the transmission shaft of the scraper filter is installed in the stepped through hole through upper and lower sliding bearings, and a first medium channel is formed between the transmission shaft and the wall of the cylinder between the upper and lower sliding bearings; the lower part of the cylindrical structure is installed with a jacket through upper and lower flanges, a jacket space for heating the medium is formed between the jacket and the outer wall of the cylindrical structure; the isolation sleeve is fixed with the upper flange of the bearing seat through fasteners, the inner magnetic rotor is connected with the top of the transmission shaft through a sleeve, and the outer magnetic rotor is connected with the power input device through a frame; a second medium channel is formed between the isolation sleeve, the inner magnetic rotor, the sleeve and the outer wall of the cylindrical structure of the bearing seat, the second medium channel is communicated with the first medium channel through a medium flow port arranged on the cylindrical structure, and a medium flow hole is arranged at the lower end of the cylindrical structure to communicate the first medium channel with the container space at the lower end of the transmission shaft.

Description

Technical Field

[0001] This invention belongs to the field of filtration and separation, and specifically relates to a magnetic sealing device for a scraper filter. Background Technology

[0002] Scraper filters are widely used in applications with high slag content and requiring continuous operation. They enable online cleaning of impurities in the process medium, ensuring continuous and stable system operation.

[0003] The rotating scraper inside the filter is driven by a transmission device at the top of the equipment, typically at a low speed, usually 2-5 r / min. When the working temperature and pressure of the medium inside the equipment are not high, and the working medium is not flammable or explosive, the drive shaft of the transmission device at the top of the scraper filter usually uses a mechanical seal or a packing seal. Packing seals can maintain good operation under low working pressure conditions, and the medium inside the container will not leak. However, prolonged operation will cause wear on the packing material, requiring frequent replacement. Moreover, when the working pressure of the medium inside the container increases, the sealing effect of the packing seal will significantly deteriorate, leading to leakage. Mechanical seals cannot achieve effective sealing at this low speed, especially in situations involving flammable, explosive, or extremely hazardous working media; mechanical seal failure can have serious consequences. The use of packing seals and mechanical seals is greatly limited under high temperature, high pressure, flammable, explosive, and extremely hazardous conditions.

[0004] Therefore, to ensure complete sealing of the scraper filter in high-temperature, high-pressure, flammable, explosive, and extremely hazardous media environments, we employ a magnetic seal device for sealing the top drive shaft of the scraper filter. Furthermore, the media processed by scraper filters are often high-viscosity, easily adhering gel-like substances. When the media enters the inner magnetic rotor of the magnetic seal along the gap in the drive shaft, if the media remains in this space for too long, the media temperature will decrease, and the media viscosity will increase sharply, resulting in increased transmission resistance. In extreme cases, the drive shaft may even become stuck to the media, preventing rotation and leading to a forced shutdown of the equipment, affecting its normal and continuous operation. Summary of the Invention

[0005] The technical problem solved by this invention is to overcome the shortcomings of the prior art and provide a magnetic sealing device for scraper filters.

[0006] The solution of the present invention is: a magnetic sealing device for a scraper filter, comprising a bearing housing, an isolation sleeve, an inner magnetic rotor, an outer magnetic rotor, an upper sliding bearing, a lower sliding bearing, and a frame;

[0007] The bearing housing body is a cylindrical structure with stepped through holes. The drive shaft of the scraper filter is installed in the stepped through holes through upper and lower sliding bearings, forming a first medium channel between the upper and lower sliding bearings and between the drive shaft and the cylindrical wall. The lower part of the cylindrical structure is fitted with a jacket through upper and lower flanges, forming a jacket space for heating the medium between the jacket and the outer wall of the cylindrical structure. The isolation sleeve is fixed to the upper flange of the bearing housing by fasteners. The inner magnetic rotor is connected to the top of the drive shaft through the sleeve, and the outer magnetic rotor is connected to the power input device through the frame. A second medium channel is formed between the isolation sleeve, the inner magnetic rotor, the sleeve, and the outer wall of the cylindrical structure of the bearing housing. The second medium channel is connected to the first medium channel through a medium flow port provided on the cylindrical structure. A medium flow hole is provided at the lower end of the cylindrical structure to connect the first medium channel with the container space at the lower end of the drive shaft.

[0008] Preferably, the jacket is provided with a steam inlet and a steam outlet. By introducing heated steam into the jacket space, the steam is used to heat the medium entering the second medium channel and the first medium channel, thereby maintaining the flowability of the medium.

[0009] Preferably, a flange is provided at the bottom of the isolation sleeve, and a temperature sensor is radially installed on the flange. The temperature sensor is connected to the second medium channel and is used to detect the medium temperature. By comparing it with a preset temperature value, it is confirmed whether the medium needs to be heated.

[0010] Preferably, the flange is radially equipped with a steam flushing port. When the magnetic sealing device needs to be disassembled or repaired, the remaining medium in the second medium channel and the first medium channel is flushed through this port to avoid environmental pollution during the disassembly of the magnetic sealing device.

[0011] Preferably, the bearing housing is a welded integral piece, with at least two media flow ports machined on the upper outer wall of the upper flange of the bearing housing, and at least two media flow ports machined at the lower end of the cylindrical structure of the bearing housing, and both media flow ports are evenly distributed circumferentially.

[0012] Preferably, the magnetic sealing device of the scraper filter of the present invention is characterized in that: both the upper sliding bearing and the lower sliding bearing are made of tin bronze material with self-lubricating properties.

[0013] Preferably, the frame includes an inner sleeve, an outer sleeve, and a connecting structure; the outer sleeve has flanges at both ends pointing outward, which are connected to the isolation sleeve and the connecting structure respectively; the inner sleeve has flanges at both ends pointing inward, with the top inner flange connected to the connecting structure and the bottom inner flange fitted with an outer magnetic rotor; the inner sleeve and the outer magnetic rotor are fitted onto the top of the isolation sleeve through the connecting structure.

[0014] Preferably, the sleeve is a cylindrical structure with a central through hole, and the cross-section of the wall of the cylindrical structure is inverted I-shaped; the outer wall of the cylindrical structure is provided with a groove for installing the inner magnetic rotor, the top end of the drive shaft is installed in the central through hole, and the inverted I-shaped crossbeam structure is provided with a through hole for connecting the upper and lower structural spaces of the sleeve.

[0015] Preferably, the temperature sensor is connected to a remote control system, which controls the start and stop of the steam system by monitoring the temperature of the medium in the inner magnetic rotor space, thereby keeping the temperature of the medium in the inner magnetic rotor space within the temperature range set by the system.

[0016] Preferably, the medium flow holes need to be evenly distributed circumferentially to ensure the stability of medium flow. Specifically, the lower end of the cylindrical structure is provided with two circumferentially distributed medium flow holes, and the medium flow holes connecting the first medium channel and the second medium channel need to be evenly distributed circumferentially at least two.

[0017] The advantages of this invention compared to the prior art are:

[0018] This magnetic sealing device ensures complete sealing of the scraper filter equipment in high-temperature, high-pressure, flammable, explosive, and extremely hazardous media environments, preventing media leakage. Furthermore, for gel-like media entering the magnetic rotor space within the magnetic seal, appropriate structural designs and methods improve the media's flow properties, avoiding the risk of solidification within the inner magnetic rotor space and ensuring long-term continuous and stable operation of the magnetic sealing device.

[0019] This magnetic sealing device enables complete sealing of process fluids in scraper filters operating under high temperature, high pressure, flammable, explosive, and extremely hazardous media. Furthermore, when handling easily adhering gel-like media, the temperature of the gel is promptly detected after it enters the inner magnetic rotor space along the drive shaft, ensuring it remains below its freezing point and allowing it to return to the container space in a timely manner, preventing the gel from lingering in the inner magnetic rotor space. This magnetic sealing device solves the problem of long-term stable operation of scraper filters in high temperature, high pressure, flammable, explosive, extremely hazardous, and easily gelling media. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the magnetic sealing device structure of the scraper filter of the present invention.

[0021] Figure 2 Schematic diagram of bearing housing structure

[0022] Figure 3 Schematic diagram of the isolation sleeve structure

[0023] In the diagram: 1-Bearing housing; 2-Isolation sleeve; 3-Drive shaft; 4-Upper sliding bearing; 5-Lower sliding bearing; 6-Inner magnetic rotor; 7-Outer magnetic rotor; 8-Frame; 9-Medium flow port; 10-Medium flow port; 11-Steam inlet; 12-Steam outlet; 13-Jacket space; 14-Steam flushing port; 15-Temperature sensor. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1-3 The present invention will be further illustrated by the embodiments.

[0025] like Figure 1 As shown, the magnetic sealing device of the scraper filter includes a bearing housing 1, an isolation sleeve 2, the isolation sleeve 2 is fixed to the bearing housing 1 by bolts, the drive shaft 3 is connected to the bearing housing 1 by an upper sliding bearing 4 and a lower sliding bearing 5, the inner magnetic rotor 6 is connected to the top of the drive shaft 3 by a sleeve, and the outer magnetic rotor 7 is connected to the power input device by a frame 8.

[0026] like Figure 2 As shown, the bearing housing 1 is an integral structure, with all parts connected by welding. The main body of the bearing housing is a cylindrical structure with stepped through holes. The drive shaft of the scraper filter is installed in the stepped through holes via upper and lower sliding bearings, forming a first medium channel between the upper and lower sliding bearings and between the drive shaft and the cylindrical wall. The lower part of the cylindrical structure is fitted with a jacket via upper and lower flanges, forming a jacket space between the jacket and the outer wall of the cylindrical structure for heating the medium. The bearing housing has two symmetrical medium flow ports 9 and two symmetrical medium flow ports 10 for the flow of the working medium. This structure allows the medium that seeps into the bearing housing along the drive shaft to flow out quickly and return to the container space through the two medium flow ports at the bottom of the bearing housing. This allows the medium to quickly circulate within the inner magnetic rotor space, preventing the medium from staying in the inner magnetic rotor space for a long time, which would cause temperature drop, increased viscosity, and thus affect the normal operation of the drive shaft. The bearing housing 1 is also connected to a steam tracing inlet pipe 11 and a steam tracing outlet pipe 12 for the flow of steam in the bearing housing jacket space 13. By introducing steam into the jacket space, the gel-like process medium entering the inner magnetic rotor space is heated by the steam to maintain the flowability of the medium.

[0027] like Figure 3 As shown, the bottom connecting flange of the isolation sleeve 2 is radially provided with a steam flushing port 14 and a temperature sensor 15. This temperature sensor is connected to the inner magnetic rotor space and can be used to detect the temperature of the medium seeping into the inner magnetic rotor space, so as to promptly confirm whether the temperature of the medium entering the inner magnetic rotor space is close to its freezing point. By comparing it with a preset temperature value, it is determined whether the medium inside the isolation sleeve needs to be heated.

[0028] The isolation sleeve 2 is fixed to the flange on the bearing seat 1 by fasteners. The inner magnetic rotor 6 is connected to the top of the drive shaft through the sleeve. The isolation sleeve 2, the inner magnetic rotor 6, the sleeve and the outer wall of the cylindrical structure of the bearing seat form a second medium channel. The second medium channel and the first medium channel are connected to form a cavity through the medium flow port 10, which is called the inner magnetic rotor space. When the equipment is working, the medium will fill the entire space under the action of internal pressure. The temperature sensor on the isolation sleeve 2 is connected to the medium and is used to detect the real-time temperature of the medium. When the gel-like medium in the container enters the space and the medium temperature is lower than a certain limit, the fluidity of the medium will become poor and it will become very easy to condense. At this time, the temperature sensor feeds back the value to the DCS. Under the action of external control, the heating steam enters the jacket space 13 from the steam inlet 11 and flows out from the steam outlet 12. The medium inside the isolation sleeve is heated by the heating effect of the steam. The medium temperature will rise under the action of the steam. When the medium temperature is higher than a certain limit, the heating steam inlet valve is closed. Through the above controls, the gel-like medium inside the isolation sleeve can maintain sufficient fluidity, preventing the gel-like medium from condensing and causing the drive shaft to jam, thereby preventing the system from stopping.

[0029] The two medium flow ports 9 and two medium flow ports 10 opened on the bearing housing can ensure that the medium has sufficient flow area during flow, increase the medium flow speed, reduce the flow time and the residence time inside the isolation sleeve. The flow speed is much faster than the flow speed through the gap space between the drive shaft and the bearing housing alone. This can effectively avoid the residence time of the adhesive medium in the internal space and also prevent the medium temperature from dropping too quickly.

[0030] The bearing housing uses self-lubricating upper sliding bearing 4 and lower sliding bearing 5, for example, made of tin bronze material with self-lubricating properties. Rolling bearings are no longer used, so there is no need to add grease to the bearing housing separately for bearing lubrication. This avoids damage to the bearing and also avoids contamination of the process medium by the grease.

[0031] The working process of this invention is as follows: The power input device drives the outer magnetic rotor to rotate through the frame. The outer magnetic rotor drives the inner magnetic rotor to rotate through magnetic force, which in turn drives the transmission shaft to start working. The lower part of the transmission shaft is placed in a container space containing a gel-like medium and is connected to the scraper main shaft through a coupling. During operation, the medium enters the inner magnetic rotor space through the shaft system and the medium flow port, and gradually fills the entire inner magnetic space. The temperature sensor detects the temperature of the medium flowing into the inner magnetic space and feeds the temperature value back to the DCS control system. When the medium temperature is lower than the lower limit set by the system, the heating system starts steam supply to heat the medium in the inner magnetic space, raising the medium temperature to increase the flowability of the medium and prevent the medium from condensing and solidifying in the inner magnetic space. When the medium temperature reaches the upper limit set by the system, the heating steam system stops steam supply, and the transmission shaft system continues to work stably.

[0032] When the magnetic sealing device needs to be disassembled, the residual gel-like medium inside the isolation sleeve must be removed first. At this time, steam can be introduced into the isolation sleeve through the steam flushing port 14 to clean the medium inside the isolation sleeve cavity, avoiding the risk of the magnetic sealing device bringing out the medium during disassembly, reducing the disassembly risk, and also avoiding environmental pollution.

[0033] The parts of this invention not described in detail are common knowledge to those skilled in the art.

Claims

1. A magnetic sealing device for a scraper filter, characterized in that: Includes bearing housing, isolation sleeve, inner magnetic rotor, outer magnetic rotor, upper sliding bearing, lower sliding bearing, and frame; The bearing housing body is a cylindrical structure with stepped through holes. The drive shaft of the scraper filter is installed in the stepped through holes through upper and lower sliding bearings, forming a first medium channel between the upper and lower sliding bearings and between the drive shaft and the cylindrical wall. A jacket is installed at the lower part of the cylindrical structure through upper and lower flanges, forming a jacket space for heating the medium between the jacket and the outer wall of the cylindrical structure. An isolation sleeve is fixed to the upper flange of the bearing housing by fasteners. The inner magnetic rotor is connected to the top of the drive shaft through a sleeve, and the outer magnetic rotor is connected to the power input device through a frame. A second medium channel is formed between the isolation sleeve, the inner magnetic rotor, the sleeve, and the outer wall of the cylindrical structure of the bearing housing. The second medium channel is connected to the first medium channel through a medium flow port provided on the cylindrical structure. A medium flow hole is provided at the lower end of the cylindrical structure to connect the first medium channel with the container space at the lower end of the drive shaft. The jacket is provided with a steam inlet and a steam outlet. By introducing heating steam into the jacket space, the steam is used to heat the medium entering the second medium channel and the first medium channel, thereby maintaining the flowability of the medium. The bottom of the isolation sleeve is provided with a flange, and a temperature sensor is radially installed on the flange. The temperature sensor is connected to the second medium channel and is used to detect the medium temperature. By comparing it with a preset temperature value, it is determined whether the medium needs to be heated.

2. The apparatus according to claim 1, characterized in that: The flange is radially equipped with a steam flushing port. When the magnetic sealing device needs to be disassembled or repaired, the remaining medium in the second medium channel and the first medium channel is flushed through this port to avoid environmental pollution during the disassembly of the magnetic sealing device.

3. The apparatus according to claim 1, characterized in that: The bearing housing is a welded integral piece. At least two media flow ports are machined on the upper outer wall of the upper flange of the bearing housing, and at least two media flow ports are machined on the lower end of the cylindrical structure of the bearing housing. Both media flow ports are evenly distributed circumferentially.

4. The apparatus according to claim 1, characterized in that: Both the upper and lower sliding bearings are made of tin bronze, a material with self-lubricating properties.

5. The apparatus according to claim 1, characterized in that: The frame includes an inner sleeve, an outer sleeve, and a connecting structure. The outer sleeve has flanges at both ends pointing outward, which are connected to the isolation sleeve and the connecting structure respectively. The inner sleeve has flanges at both ends pointing inward, with the top inner flange connected to the connecting structure and the bottom inner flange fitted with an outer magnetic rotor. The inner sleeve and the outer magnetic rotor are fitted onto the top of the isolation sleeve through the connecting structure.

6. The apparatus according to claim 1, characterized in that: The sleeve is a cylindrical structure with a central through hole, and the cross-section of the wall of the cylindrical structure is inverted I-shaped. The outer wall of the cylindrical structure is provided with a groove for installing the inner magnetic rotor. The top end of the drive shaft is installed in the central through hole. The inverted I-shaped crossbeam structure is provided with a through hole for connecting the upper and lower structural spaces of the sleeve.

7. The apparatus according to claim 1, characterized in that: The temperature sensor is connected to the remote control system and controls the start and stop of the steam system by monitoring the temperature of the medium in the inner magnetic rotor space, thereby keeping the temperature of the medium in the inner magnetic rotor space within the temperature range set by the system.

8. The apparatus according to claim 1, characterized in that: The medium flow holes need to be evenly distributed circumferentially to ensure the stability of medium flow. Specifically, the lower end of the cylindrical structure is provided with two medium flow holes evenly distributed circumferentially. The medium flow holes connecting the first medium channel and the second medium channel need to be evenly distributed circumferentially at least two.

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