阅读说明：本技术 带有多个通孔结构磁源的磁流体密封装置 (Magnetic fluid sealing device with magnetic source with multiple through hole structures ) 是由 刘嘉伟 李德才 于 2021-09-07 设计创作，主要内容包括：本发明涉及一种带有多个通孔结构磁源的磁流体密封,包括外壳、左极靴环、右极靴环和永久磁铁环。本发明提出了环形永久磁铁同时开设多个通孔的设计方法,该结构解决了磁性液体密封常用的环形磁体存在的永久磁铁环难加工、磁性液体的添加、数据收集、定位、连通等难题,工程中可以通过通孔注入磁性液体,或在通孔处放置数据监测装置,例如温度传感器、速度传感器、磁位计等以便进行数据收集；或在通孔处加工螺纹,从而满足环形磁体的固定需要,使得该磁性液体密封一方面很好的解决了工程上存在的上述问题,另一方面使永久磁铁结构变轻,减轻转轴的负荷。(The invention relates to a magnetic fluid seal with a plurality of through hole structure magnetic sources, which comprises a shell, a left pole shoe ring, a right pole shoe ring and a permanent magnet ring. The invention provides a design method for simultaneously forming a plurality of through holes on an annular permanent magnet, which solves the problems of difficult processing of a permanent magnet ring, addition of magnetic liquid, data collection, positioning, communication and the like of the annular magnet commonly used for sealing the magnetic liquid, and can inject the magnetic liquid through the through holes in the engineering or place data monitoring devices, such as temperature sensors, speed sensors, magnetic position meters and the like, at the through holes so as to collect data; or the through hole is processed with screw thread, thereby satisfying the fixing requirement of the annular magnet, on one hand, the magnetic liquid seal well solves the problems existing in engineering, on the other hand, the permanent magnet structure becomes light, and the load of the rotating shaft is lightened.)

1. A magnetic fluid seal with a plurality of through hole structure magnetic sources comprises a shell (2), a left pole shoe ring (3), a permanent magnet ring (4) and a right pole shoe ring (6); the method is characterized in that: the left pole shoe ring (3), the permanent magnet ring (4) and the right pole shoe ring (6) are arranged on the inner wall of the shell (2), and a gap is reserved between the inner circular surfaces of the left pole shoe ring (3) and the right pole shoe ring (6) and the outer circular surface of the shaft section of the shaft (1); the inner circular surfaces of the left pole shoe ring (3) and the right pole shoe ring (6) are provided with pole teeth (7), the pole teeth (7) extend along the radial direction to the outer circular surface of the shaft section of the shaft (1) and leave a gap with the outer circular surface, the gap is filled with magnetic fluid for sealing, the permanent magnet ring (4) is made of sintered neodymium iron boron, a radial communication through hole (5) and an axial communication through hole (14) are arranged on the permanent magnet ring, when the diameter of the through hole is more than two thirds of the axial length of the permanent magnet ring and the included angle between the through hole and the axis connecting line is less than 90 degrees, the pressure resistance value can obviously decline, and as the material belongs to a brittle and hard material which is difficult to process, the through hole is difficult to process, the permanent magnet ring is easy to break, in order to provide enough pressure resistance value for sealing the magnetic fluid, the radial communication through hole is arranged at the edge far away from the permanent magnet axial direction, and the axial communication through hole is arranged at the edge far away from the permanent magnet radial edge, the diameter of the communication through-hole is less than two thirds of the axial length of the ring of permanent magnets.

2. A magnetic fluid seal with multiple through hole configuration magnetic sources as claimed in claim 1 wherein: the number of the pole teeth (7) arranged on the outer circular surface of the shaft section of the shaft (1) is 4-10.

3. A magnetic fluid seal with multiple through hole configuration magnetic sources as claimed in claim 1 wherein: the size of a gap between the pole teeth (7) and the inner circular surfaces of the left pole shoe ring (3) and the right pole shoe ring (6) is 0.05-3 mm.

4. A magnetic fluid seal for a multiple via configuration magnetic source as claimed in claim 1 wherein: the permanent magnet ring (4) is an axial magnetizing type permanent magnet ring.

5. A magnetic fluid seal with multiple through hole configuration magnetic sources as claimed in claim 1 wherein: the outer circular surfaces of the left pole shoe ring (3) and the right pole shoe ring (6) are provided with annular grooves, and sealing rings (10) are arranged in the annular grooves.

6. A magnetic fluid seal with multiple through hole configuration magnetic sources as claimed in claim 1 wherein: the magnetic field isolation device also comprises a left magnetism isolation ring (11) and a right magnetism isolation ring (9); the left magnetism isolating ring (11) and the right magnetism isolating ring (9) are arranged on the inner wall of the shell (2), the left magnetism isolating ring (11) is located on the left side of the left pole shoe ring (3), and the right magnetism isolating ring (9) is located on the right side of the right pole shoe ring (6).

7. A magnetic fluid seal with multiple through hole configuration magnetic sources as claimed in claim 1 wherein: the shaft is characterized by further comprising a left bearing (12) and a right bearing (8), wherein the left bearing (12) and the right bearing (8) are respectively sleeved on the shaft (1), and the left bearing (12) is arranged on the left side of the left magnetism isolating ring (11) and is in contact with the left magnetism isolating ring (11); the right bearing (8) is arranged on the right side of the right magnetism isolating ring (9) and is in contact with the shaft (1) and the right magnetism isolating ring (9).

Technical Field

The invention belongs to the field of mechanical engineering sealing, and particularly relates to a magnetic fluid seal with a plurality of through hole structure magnetic sources

Provided is a device.

Background

The magnetic fluid seal is characterized in that the magnetic fluid is firmly fixed in the seal gap by utilizing the magnetic field force generated by the permanent magnet in the seal gap to resist the pressure difference at two sides, thereby achieving the sealing effect.

In some sealing occasions, besides the need of sealing a sealed cabin and the external environment, the problems of addition, data collection, positioning and communication of magnetic liquid exist, referring to the field of mechanical engineering, firstly, a method is thought to be to process a communication through hole on a permanent magnet ring, but because the pressure resistance of a magnetic liquid sealing device is weakened to a certain extent due to the structure of the through hole on the permanent magnet ring, and a common rubidium iron boron magnet is a brittle and hard material which is difficult to process, and the excessive processing of the rubidium iron boron magnet easily causes the breakage of the permanent magnet ring, so that the magnetic liquid seal has no similar structure.

Disclosure of Invention

The invention aims to provide a magnetic fluid sealing device with a plurality of through hole structure magnetic sources, wherein the through hole structure can be used as a placing position of a magnetic field, temperature and speed measuring device and an adding channel of magnetic liquid during working, and can also be used for processing threads, so that the weight of the sealing device is reduced, the load on a rotating shaft is reduced, and the problems of adding, data collection, positioning and communication of the magnetic liquid existing in the conventional sealing device are solved.

The patent carries out finite element simulation aiming at a large number of magnetic liquid sealing examples, analyzes the simulation result and provides a reasonable design scheme of the size and the position of the through hole structure.

The technical scheme of the invention is as follows: the magnetic fluid seal with the magnetic sources with the through hole structures comprises a shell, a left pole shoe ring, a right pole shoe ring and a permanent magnet ring; the left pole shoe ring, the right pole shoe ring and the permanent magnet ring are arranged on the inner wall of the shell, and a gap is reserved between the inner circular surfaces of the left pole shoe ring and the right pole shoe ring and the outer circular surface of the shaft section; the outer circular surface of the shaft is provided with pole teeth, the pole teeth extend towards the inner circular surfaces of the left pole shoe ring and the right pole shoe ring, a gap is reserved between the pole teeth and the inner circular surfaces of the left pole shoe ring and the right pole shoe ring, and the gap is filled with magnetic fluid for sealing. Permanent magnet ring use sintered neodymium iron boron to make, it has radial and a plurality of intercommunication through-holes of axial to open on it, be greater than two-thirds of the axial length of permanent magnet ring when the through-hole diameter, the contained angle of through-hole and axle center line is less than 90 when, obvious decline can appear in the withstand voltage value, and because this material belongs to the brittle and hard material of difficult processing, the through-hole oversize can lead to the processing difficulty, the permanent magnet ring is fragile, can provide sufficient withstand voltage value for making the magnetic liquid seal, should set up radial intercommunication through-hole in keeping away from permanent magnet axial edge, axial intercommunication through-hole sets up in keeping away from permanent magnet radial edge, intercommunication through-hole diameter will be less than two-thirds of the axial length of permanent magnet ring.

The magnetic fluid seal with the magnetic source with the through hole structure is characterized in that: the number of the pole teeth arranged on the outer circular surface of the shaft section of the shaft is 4-10.

The magnetic fluid seal with the magnetic source with the through hole structure is characterized in that: the size of the gap between the pole teeth and the inner circular surfaces of the left pole shoe ring and the right pole shoe ring is 0.05-3 mm.

The magnetic fluid seal with the magnetic source with the through hole structure is characterized in that: the permanent magnet ring is an axial magnetizing permanent magnet ring.

The magnetic fluid seal with the magnetic source with the through hole structure is characterized in that: the outer circular surfaces of the left pole shoe ring and the right pole shoe ring are provided with annular grooves, and sealing rings are arranged in the annular grooves.

The square magnetic fluid sealing device with multiple magnetic sources is characterized in that: the magnetic field generator also comprises a left magnetism isolating ring and a right magnetism isolating ring; the left magnetism isolating ring and the right magnetism isolating ring are arranged on the inner wall of the shell, the left magnetism isolating ring is positioned on the left side of the left pole shoe ring, and the right magnetism isolating ring is positioned on the left side of the left pole shoe ring

The annular magnetic isolation ring is positioned on the right side of the right pole shoe ring.

The magnetic fluid seal with the magnetic source with the through hole structure is characterized in that: the left bearing and the right bearing are respectively sleeved on the shaft, and the left bearing is arranged on the left side of the left magnetism isolating ring and is in contact with the left magnetism isolating ring; the right bearing is arranged on the right side of the right magnetism isolating ring and is in contact with the shaft and the right magnetism isolating ring.

The invention uses a classic magnetic liquid sealing structure that a left pole shoe ring, a permanent magnet ring and a right pole shoe ring are sequentially arranged on the inner wall of a shell, so that magnetic lines of force of the permanent magnet ring form a loop through a pole shoe and a shaft, under the action of pole teeth, the magnetic lines of force generated by the permanent magnet ring reach the magnetic liquid ring-forming position through the pole teeth as most as possible after passing through the pole shoe through the design of the left pole shoe ring, the permanent magnet ring and the right pole shoe through-hole ring, and the occurrence of magnetic leakage can be greatly reduced. The through hole is arranged at a position far away from the rotating shaft, the diameter of the through hole is smaller than the radial width of the magnet, and the structural design can ensure that the magnetic liquid is sealed to have a sufficient pressure resistance value.

Drawings

Fig. 1 is a schematic structural diagram of a square magnetic fluid sealing device with multiple magnetic sources according to an embodiment of the present invention; the serial number designations and corresponding designations in the drawings are as follows: 1-shaft, 2-shell, 3-left pole shoe ring, 4-permanent magnet ring, 5-radial communicating through hole, 6-right pole shoe ring, 7-pole tooth, 8-right bearing, 9-sealing ring, 10-right magnetism isolating ring, 11-left magnetism isolating ring, 12-right bearing, 13-end cover, 14-axial communicating through hole.

Detailed Description

The invention will be further explained with reference to the drawings.

As shown in fig. 1, the magnetic fluid seal with a plurality of magnetic sources with through-hole structures includes a housing, a left pole shoe ring, a right pole shoe ring, and a permanent magnet ring; the left pole shoe ring, the right pole shoe ring and the permanent magnet ring are arranged on the inner wall of the shell, and a gap is reserved between the inner circular surfaces of the left pole shoe ring and the right pole shoe ring and the outer circular surface of the shaft section; the outer circular surface of the shaft is provided with pole teeth, the pole teeth extend towards the inner circular surfaces of the left pole shoe ring and the right pole shoe ring, a gap is reserved between the pole teeth and the inner circular surfaces of the left pole shoe ring and the right pole shoe ring, and the gap is filled with magnetic fluid for sealing. Permanent magnet ring use sintered neodymium iron boron to make, it has radial intercommunication through-hole and a plurality of intercommunication through-holes of axial to open on it, be greater than two-thirds of the axial length of permanent magnet ring when the through-hole diameter, the contained angle of through-hole and axle center line is less than 90 when, obvious decline can appear in the withstand voltage value, and because this material belongs to the brittle hard material of difficult processing, the through-hole oversize can lead to the processing difficulty, the permanent magnet ring is fragile, can provide sufficient withstand voltage value for making the magnetic liquid sealed, should set up radial intercommunication through-hole in keeping away from permanent magnet axial edge, axial intercommunication through-hole sets up in keeping away from permanent magnet radial edge, intercommunication through-hole diameter will be less than two-thirds of the axial length of permanent magnet ring.

The magnetic fluid seal with the magnetic source with the through hole structure is characterized in that: the number of the pole teeth arranged on the outer circular surface of the shaft section is 4-10.

The magnetic fluid seal with the magnetic source with the through hole structure is characterized in that: the size of the gap between the pole teeth and the inner circular surfaces of the left pole shoe ring and the right pole shoe ring is 0.05-0.3 mm.

The magnetic fluid seal with the magnetic source with the through hole structure is characterized in that: the permanent magnet ring is an axial magnetizing permanent magnet ring.

The magnetic fluid seal with the magnetic source with the through hole structure is characterized in that: the outer circular surfaces of the left pole shoe ring and the right pole shoe ring are provided with annular grooves, and sealing rings are arranged in the annular grooves.

The magnetic fluid seal with the magnetic source with the through hole structure is characterized in that: the magnetic field generator also comprises a left magnetism isolating ring and a right magnetism isolating ring; the left magnetism isolating ring and the right magnetism isolating ring are arranged on the inner wall of the shell, the left magnetism isolating ring is located on the left side of the left pole shoe ring, and the right magnetism isolating ring is located on the right side of the right pole shoe ring.

The magnetic fluid seal with the magnetic source with the through hole structure is characterized in that: the left bearing and the right bearing are respectively sleeved on the shaft, and the left bearing is arranged on the left side of the left magnetism isolating ring and is in contact with the left magnetism isolating ring; the right bearing is arranged on the right side of the right magnetism isolating ring and is in contact with the shaft and the right magnetism isolating ring.