CN111577649A - Magnetic fluid sealing device for slurry pump - Google Patents

Magnetic fluid sealing device for slurry pump Download PDF

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Publication number
CN111577649A
CN111577649A CN202010391719.8A CN202010391719A CN111577649A CN 111577649 A CN111577649 A CN 111577649A CN 202010391719 A CN202010391719 A CN 202010391719A CN 111577649 A CN111577649 A CN 111577649A
Authority
CN
China
Prior art keywords
magnetic
sealing
magnetic fluid
pole shoe
ring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010391719.8A
Other languages
Chinese (zh)
Inventor
谢方伟
方树鹏
邵焕
田祖织
朱真才
张海防
丁志文
王在峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China University of Mining and Technology CUMT
Shandong Zhangqiu Blower Co Ltd
Original Assignee
China University of Mining and Technology CUMT
Shandong Zhangqiu Blower Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China University of Mining and Technology CUMT, Shandong Zhangqiu Blower Co Ltd filed Critical China University of Mining and Technology CUMT
Priority to CN202010391719.8A priority Critical patent/CN111577649A/en
Publication of CN111577649A publication Critical patent/CN111577649A/en
Pending legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/08Sealings
    • F04D29/10Shaft sealings
    • F04D29/106Shaft sealings especially adapted for liquid pumps
    • F04D29/108Shaft sealings especially adapted for liquid pumps the sealing fluid being other than the working liquid or being the working liquid treated
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/04Shafts or bearings, or assemblies thereof
    • F04D29/043Shafts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/08Sealings
    • F04D29/10Shaft sealings
    • F04D29/12Shaft sealings using sealing-rings
    • F04D29/126Shaft sealings using sealing-rings especially adapted for liquid pumps

Abstract

The invention discloses a magnetic fluid sealing device for a slurry pump, which comprises a rotating shaft, a non-magnetic-conductive sealing seat, a bearing, a magnetic fluid sealing assembly, a floating ring sealing assembly and a gas pressure sensor, wherein an axial upper air inlet hole is formed in the axis of the rotating shaft; the magnetic fluid sealing assembly and the floating ring sealing assembly are arranged in an inner cavity of the non-magnetic-conduction sealing seat and are sleeved with the rotating shaft, the magnetic fluid sealing assembly comprises a right magnetic isolation ring, a right pole shoe, a left magnetic isolation ring, a permanent magnet and a magnetic conduction sleeve, and the left pole shoe, the permanent magnet, the right pole shoe and the magnetic conduction sleeve form a magnetic loop; the floating ring sealing assembly comprises a fixed support, a floating ring, a pin and a spring, and the right end face of the floating ring is in close contact with the inner wall of the fixed support under the action of the pin and the spring. The sealing device overcomes the defect that the direct contact of the slurry pump solution and the magnetic fluid seal causes the sealing failure, improves the pressure resistance of the magnetic fluid seal, can realize zero leakage of a sealing medium, and has long service life.

Description

Magnetic fluid sealing device for slurry pump
Technical Field
The invention relates to the field of engineering sealing, in particular to a magnetic fluid sealing device for a slurry pump.
Background
The application of the slurry pump is very wide, and the axial sealing technology of a rotating shaft of the slurry pump is a key part of the pump. The leakage of the slurry pump liquid can not only cause waste, but also pollute the environment and cause certain threats to the equipment operation and personal safety. Therefore, the sealing performance of the slurry pump is an important index for evaluating the slurry pump. The traditional axial sealing technology of the slurry pump mainly comprises a packing seal, a mechanical seal and an auxiliary impeller seal, and no leakage of the slurry pump liquid can not be realized in any seal.
At present, the magnetic fluid sealing technology is widely applied to sealing in vacuum or gas, but when the magnetic fluid is used for sealing a rotating shaft of a slurry pump, the failure principle is more complex, mainly because a sealed medium is liquid, the liquid is directly contacted with the magnetic fluid to cause the emulsification of the magnetic fluid and further the sealing failure, the pressure resistance value of the magnetic fluid sealing is smaller, and the sealing failure can be caused once the pressure value of leaked liquid exceeds the pressure resistance value of the magnetic fluid sealing. The chinese patent with application number CN110131419A proposes a combined sealing technology of filler sealing and magnetic fluid sealing, which uses the filler sealing as the front end sealing to solve the problem of small pressure bearing capacity of the magnetic fluid sealing, but does not consider the emulsification of the magnetic fluid caused by the contact between the liquid leaked from the filler sealing and the magnetic fluid sealing.
Disclosure of Invention
The invention aims to provide a magnetic fluid sealing device for a slurry pump, which overcomes the defect of sealing failure caused by direct contact of a slurry pump solution and a magnetic fluid seal, improves the pressure resistance of the magnetic fluid seal, can realize zero leakage of a sealing medium, and has long service life.
The technical scheme adopted by the invention for solving the technical problems is as follows: a magnetic fluid sealing device for a slurry pump comprises a rotating shaft, a non-magnetic conductive sealing seat, bearings and a sealing end cover, wherein the rotating shaft is sleeved with the non-magnetic conductive sealing seat; the magnetic fluid sealing assembly and the floating ring sealing assembly are arranged in an inner cavity of the non-magnetic-conduction sealing seat and are sleeved with the rotating shaft, the magnetic fluid sealing assembly comprises a right magnetic isolation ring, a right pole shoe, a left magnetic isolation ring, a permanent magnet and a magnetic conduction sleeve, and the left pole shoe, the permanent magnet, the right pole shoe and the magnetic conduction sleeve form a magnetic loop; the floating ring sealing assembly comprises a fixed support, a floating ring, a pin and a spring, the fixed support is sleeved with the magnetic conduction sleeve, and the right end face of the floating ring is in close contact with the inner wall of the fixed support under the action of the pin and the spring.
Further, the permanent magnet is positioned on the shaft shoulders of the left pole shoe and the right pole shoe, magnetic fluid is filled in the pole tooth gaps among the left pole shoe, the right pole shoe, the permanent magnet and the magnetic conduction sleeve, and the magnetic fluid forms an O-shaped sealing ring under the action of the permanent magnet; the left magnetism isolating ring is arranged at one end of the left pole shoe, and the right magnetism isolating ring is arranged at one end of the right pole shoe.
Furthermore, the magnetic conduction sleeve is sleeved with the rotating shaft, and the rotating shaft and the magnetic conduction sleeve are in interference fit.
Further, the fixed support and the magnetic conduction sleeve are in clearance fit, and the fixed support is connected with the non-magnetic conduction sealing seat through a screw.
Further, the floating ring forms an air film with the magnetic conduction sleeve under the pressure action of the sealing air.
Furthermore, a notch for installing a sealing ring is formed in the outer circular surface of the fixed support.
The left magnetism isolating ring and the non-magnetism-conducting sealing seat are provided with coaxial holes for mounting a gas pressure sensor, and the gas pressure sensor and a gas outlet of the shaft gas inlet are positioned on the same end face.
The invention has the beneficial effects that:
1. according to the sealing device, the shaft upper air inlet hole is formed in the rotating shaft, air is added into the sealing device through the shaft upper air inlet hole, emulsification and deterioration of the magnetic fluid are avoided, and the service life of the magnetic fluid sealing device is prolonged.
2. The floating ring sealing assembly is arranged at the front end of the magnetic fluid seal, so that the function of throttling and reducing pressure is achieved for leakage liquid of the slurry pump through the floating ring seal, the pressure resistance of the sealing device is improved, and zero leakage of the axial seal of the slurry pump is achieved.
Drawings
FIG. 1 is a state diagram of the present invention in use;
in the figure:
the magnetic bearing comprises a non-magnetic-conductive sealing seat 1, a bearing I2, a bearing I3, a magnetic-conductive sleeve 4, a screw 5, a fixed support 6, a floating ring 7, a gas pressure sensor 8, a permanent magnet 9, a sealing ring 10, a sealing end cover 11, a bearing II 12, a rotating shaft 13, an axial upper air inlet hole 14, a bolt connecting piece 15, a right magnetism isolating ring 15, a right pole shoe 16, a left pole shoe 17, a left magnetism isolating ring 18, a 19 pin and a spring 20.
Detailed Description
The magnetic fluid sealing device for the slurry pump is described in detail below with reference to the attached drawings.
As shown in fig. 1, the magnetic fluid sealing device for the slurry pump comprises a rotating shaft 12, a non-magnetic conductive sealing seat 1, a bearing and a sealing end cover 10, wherein the rotating shaft 12 is sleeved with the non-magnetic conductive sealing seat 1, the left end of an inner cavity of the non-magnetic conductive sealing seat 1 is provided with the bearing i 2, the right end of the inner cavity of the non-magnetic conductive sealing seat 1 is provided with the bearing ii 11, and the right end of the non-magnetic conductive sealing seat is provided with the sealing end cover 10. The left end of the rotating shaft 12 is sleeved in a bearing I2, and the right end of the bearing I2 is adjacent to a shaft shoulder at the left end of the rotating shaft 12. And the bearing I2 is sleeved in a round hole at the left end of the inner cavity of the non-magnetic-conductive sealing seat 1. The right end of the rotating shaft 12 is sleeved in the bearing II 11, and the left end of the bearing II 11 is propped against a shaft shoulder at the right end of the rotating shaft 12. And the bearing II 11 is in interference fit with the inner wall of the sealing end cover 12. The sealing end cover 10 and the non-magnetic-conductive sealing seat 1 are fixed by a bolt connecting piece 14, and the inner side of the sealing end cover 10 is propped against the right magnetism isolating ring 15. The sealing device also comprises a magnetic fluid sealing assembly, a floating ring sealing assembly and a gas pressure sensor 7, wherein an axial upper air inlet hole 13 is arranged on the axis of the rotating shaft; the magnetic fluid sealing assembly and the floating ring sealing assembly are arranged in an inner cavity of the non-magnetic-conduction sealing seat and are sleeved with the rotating shaft, the magnetic fluid sealing assembly comprises a right magnetic isolation ring 15, a right pole shoe 16, a left pole shoe 17, a left magnetic isolation ring 18, a permanent magnet 8 and a magnetic conduction sleeve 3, and the left pole shoe 17, the permanent magnet 8, the right pole shoe 16 and the magnetic conduction sleeve 3 form a magnetic loop; the permanent magnet 8 is positioned on the shaft shoulders of the left pole shoe 17 and the right pole shoe 16, magnetic fluid is filled in the pole tooth gaps among the left pole shoe 17, the permanent magnet 8 and the magnetic conductive sleeve 3, and the magnetic fluid forms an O-shaped sealing ring under the action of the permanent magnet 8. The left magnetism isolating ring 18 is arranged at one end of a left pole shoe 17, the right magnetism isolating ring 15 is arranged at one end of a right pole shoe 16, the right magnetism isolating ring 15 is arranged on the inner side of the sealing end cover 10, and the left magnetism isolating ring 18 is adjacent to the fixed support 5 of the floating ring sealing assembly.
The left magnetism isolating ring 18 and the non-magnetic conductive sealing seat 1 are provided with coaxial holes for installing the gas pressure sensor 7, and the gas pressure sensor 7 and the gas outlet of the axial upper gas inlet 13 are positioned on the same end face. The gas pressure sensor 7 is positioned in the coaxial holes of the left magnetism isolating ring 18 and the non-magnetic conductive seal seat 1 and is used for monitoring the gas pressure in the sealing device and ensuring that the gas pressure does not exceed the pressure resistance value of the magnetic fluid seal.
The floating ring sealing assembly comprises a fixed support 5, a floating ring 6, a pin 19 and a spring 20, the fixed support 5 is sleeved with a magnetic conduction sleeve 3, the right end face of the floating ring 6 is tightly contacted with the inner wall of the fixed support 5 under the action of the pin 19 and the spring 20, the magnetic conduction sleeve is sleeved with a rotating shaft, and the rotating shaft and the magnetic conduction sleeve are in interference fit. The fixed support 5 and the magnetic conduction sleeve 3 are in clearance fit, and the fixed support 5 is connected with the non-magnetic conduction sealing seat 1 through a screw 4. And a notch 9 for mounting a sealing ring is formed on the outer circular surface of the fixed support 5. The floating ring assembly is in clearance fit with the magnetic conduction sleeve, and the floating ring 6 forms a gas film between the magnetic conduction sleeve 3 and the pressure of sealing gas, so that the throttling and pressure reducing effects on the leaked liquid are achieved. The air is added into the sealing device through the air inlet 13 on the shaft, so that the sealing of the slurry pump solution is changed into the sealing of gas, the emulsification and deterioration of the magnetic fluid caused by the direct contact of the slurry pump solution and the magnetic fluid seal are prevented, and the service life of the magnetic fluid sealing device is prolonged.
In the working process, gas is added into the cavity of the non-magnetic conduction seal seat 1 through the air inlet 13 on the shaft, then the sealing of the magnetic fluid sealing device on the solution of the slurry pump is converted into the sealing of the gas, the floating ring 6 forms a gas film between the floating ring 6 and the magnetic conduction sleeve 3 under the pressure action of the sealing gas, the liquid axially leaked by the slurry pump is throttled and depressurized, and the gas pressure sensor 7 monitors the gas pressure in the sealing device in real time.
The device provided by the invention effectively avoids the emulsification and deterioration of the magnetic fluid caused by the contact of the magnetic fluid and the liquid, prolongs the service life of the sealing device, improves the pressure resistance of the sealing device, and realizes zero leakage of the axial seal of the slurry pump.
While the foregoing is directed to the principles of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Other technical features than those described in the specification are known to those skilled in the art.

Claims (7)

1. A magnetic fluid sealing device for a slurry pump comprises a rotating shaft, a non-magnetic conductive sealing seat, bearings and a sealing end cover, wherein the rotating shaft is sleeved with the non-magnetic conductive sealing seat; the magnetic fluid sealing assembly and the floating ring sealing assembly are arranged in an inner cavity of the non-magnetic-conduction sealing seat and are sleeved with the rotating shaft, the magnetic fluid sealing assembly comprises a right magnetic isolation ring, a right pole shoe, a left magnetic isolation ring, a permanent magnet and a magnetic conduction sleeve, and the left pole shoe, the permanent magnet, the right pole shoe and the magnetic conduction sleeve form a magnetic loop; the floating ring sealing assembly comprises a fixed support, a floating ring, a pin and a spring, the fixed support is sleeved with the magnetic conduction sleeve, and the right end face of the floating ring is in close contact with the inner wall of the fixed support under the action of the pin and the spring.
2. The magnetic fluid sealing device for the slurry pump according to claim 1, wherein the permanent magnet is positioned on the shaft shoulders of the left pole shoe and the right pole shoe, magnetic fluid is filled in the pole tooth gaps among the left pole shoe, the right pole shoe, the permanent magnet and the magnetic conductive sleeve, and the magnetic fluid forms an O-shaped sealing ring under the action of the permanent magnet; the left magnetism isolating ring is arranged at one end of the left pole shoe, and the right magnetism isolating ring is arranged at one end of the right pole shoe.
3. The magnetic fluid sealing device for the slurry pump according to claim 1, wherein the magnetic conductive sleeve is sleeved with the rotating shaft, and the rotating shaft and the magnetic conductive sleeve are in interference fit.
4. The magnetic fluid sealing device for the slurry pump according to claim 1, wherein the fixed support and the magnetic conductive sleeve are in clearance fit, and the fixed support is connected with the non-magnetic conductive sealing seat through a screw.
5. The magnetic fluid sealing device for the slurry pump according to claim 1, wherein the floating ring forms a gas film with the magnetic conductive sleeve under the pressure of the sealing gas.
6. The magnetic fluid sealing device for the slurry pump according to claim 1, wherein the outer circumferential surface of the fixed support is provided with a notch for mounting the sealing ring.
7. The magnetic fluid sealing device for the slurry pump as claimed in claim 1 or 2, wherein the left magnetism isolating ring and the non-magnetic-conductive sealing seat are provided with coaxial holes for mounting a gas pressure sensor, and the gas pressure sensor and the gas outlet of the axial gas inlet hole are located on the same end face.
CN202010391719.8A 2020-05-11 2020-05-11 Magnetic fluid sealing device for slurry pump Pending CN111577649A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010391719.8A CN111577649A (en) 2020-05-11 2020-05-11 Magnetic fluid sealing device for slurry pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010391719.8A CN111577649A (en) 2020-05-11 2020-05-11 Magnetic fluid sealing device for slurry pump

Publications (1)

Publication Number Publication Date
CN111577649A true CN111577649A (en) 2020-08-25

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ID=72113405

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010391719.8A Pending CN111577649A (en) 2020-05-11 2020-05-11 Magnetic fluid sealing device for slurry pump

Country Status (1)

Country Link
CN (1) CN111577649A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112387225A (en) * 2020-10-30 2021-02-23 清华大学 Composite magnetic medium sealing device for reaction kettle
CN113074254A (en) * 2021-04-15 2021-07-06 西华大学 High-speed magnetic fluid sealing device for high-temperature working condition

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6845986B2 (en) * 2002-04-26 2005-01-25 Stemco Llc Low torque seal assembly
CN102072326A (en) * 2011-01-24 2011-05-25 北京交通大学 Magnetic liquid sealing process researching device
CN102094846A (en) * 2011-03-07 2011-06-15 攀枝花钢企欣宇化工有限公司 Mechanical seal structure for brine pressure pump
CN103557335A (en) * 2013-11-11 2014-02-05 北京交通大学 Inflatable magnetic liquid rotating seal device
US20140035231A1 (en) * 2012-07-31 2014-02-06 General Electric Company Seal system and method for rotary machine
CN103759016A (en) * 2014-01-17 2014-04-30 北京交通大学 Upstream pumping magnetic-fluid sealing device
CN106015585A (en) * 2016-07-29 2016-10-12 广西科技大学 Floating ring-magnetofluid sealing device
CN110762307A (en) * 2019-12-03 2020-02-07 中国工程物理研究院总体工程研究所 Magnetic fluid sealing rotary joint

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6845986B2 (en) * 2002-04-26 2005-01-25 Stemco Llc Low torque seal assembly
CN102072326A (en) * 2011-01-24 2011-05-25 北京交通大学 Magnetic liquid sealing process researching device
CN102094846A (en) * 2011-03-07 2011-06-15 攀枝花钢企欣宇化工有限公司 Mechanical seal structure for brine pressure pump
US20140035231A1 (en) * 2012-07-31 2014-02-06 General Electric Company Seal system and method for rotary machine
CN103557335A (en) * 2013-11-11 2014-02-05 北京交通大学 Inflatable magnetic liquid rotating seal device
CN103759016A (en) * 2014-01-17 2014-04-30 北京交通大学 Upstream pumping magnetic-fluid sealing device
CN106015585A (en) * 2016-07-29 2016-10-12 广西科技大学 Floating ring-magnetofluid sealing device
CN110762307A (en) * 2019-12-03 2020-02-07 中国工程物理研究院总体工程研究所 Magnetic fluid sealing rotary joint

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112387225A (en) * 2020-10-30 2021-02-23 清华大学 Composite magnetic medium sealing device for reaction kettle
CN112387225B (en) * 2020-10-30 2021-09-07 清华大学 Composite magnetic medium sealing device for reaction kettle
CN113074254A (en) * 2021-04-15 2021-07-06 西华大学 High-speed magnetic fluid sealing device for high-temperature working condition

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Application publication date: 20200825