阅读说明：本技术 一种渣浆泵用磁流体密封装置 (Magnetic fluid sealing device for slurry pump ) 是由 谢方伟 方树鹏 邵焕 田祖织 朱真才 张海防 丁志文 王在峰 于 2020-05-11 设计创作，主要内容包括：本发明公开了一种渣浆泵用磁流体密封装置,包括旋转轴、非导磁密封座、轴承、磁流体密封组件、浮动环密封组件和气体压力传感器,所述旋转轴轴线上设有轴上进气孔；所述磁流体密封组件和浮动环密封组件均设于非导磁密封座内腔且与旋转轴套置,所述磁流体密封组件包括右隔磁环、右极靴、左极靴、左隔磁环、永磁体和导磁套筒,所述左极靴、永磁体、右极靴和导磁套筒构成磁回路；所述浮动环密封组件包括固定支座、浮动环、销和弹簧,所述浮动环的右端面在销和弹簧的作用下与固定支座的内壁紧密接触。该密封装置克服了渣浆泵溶液与磁流体密封直接接触导致密封失效的不足,提高磁流体密封的耐压能力,能够实现密封介质的零泄露,使用寿命长。(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.)

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.

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.