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Method for assembling ferrofluid seal, and ferrofluid seal

A technology of magnetic fluid and assembly method, which is applied to the sealing of the engine, the rigid support of the bearing parts, the bearing components, etc., which can solve the problems of the movement of the magnetic pole parts, the narrowing of the interval, and the difficulty of fixing the method, so as to inhibit the movement of the magnetic pole parts Effect

Active Publication Date: 2017-02-22
EAGLEBURGMANN JAPAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the second bearing 905 is first fixed, it is difficult to take out the split piece of the jig radially outward due to the pressure of the two magnetic pole members 902 and 903.
In addition, when the split piece of the jig is taken out, since the space between the two magnetic pole members 902, 903 is narrowed, the installation of the split piece of the magnet 901 becomes difficult.
Therefore, it is difficult to realize the method of first fixing the second bearing 905
[0007] According to the above, when the magnetic fluid seals of the magnetic pole parts (magnetic fluid holding parts) arranged on both sides of the magnet are installed according to the method of the prior art, there is a magnetic force generated by the installed magnet to make the magnetic pole parts from the position where they are positioned. mobile situation

Method used

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  • Method for assembling ferrofluid seal, and ferrofluid seal
  • Method for assembling ferrofluid seal, and ferrofluid seal
  • Method for assembling ferrofluid seal, and ferrofluid seal

Examples

Experimental program
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Effect test

Embodiment 1

[0051]

[0052] refer to figure 1 , the overall structure of the magnetic fluid seal 100 of the embodiment of the present invention will be described. figure 1 A schematic cross-sectional view showing a schematic structure of the magnetic fluid seal 100 taken along a plane including the central axis of the shaft 400 is shown. Also, since the configuration of the opposite side portion with the central axis is approximately symmetrical thereto, it is omitted in the drawing.

[0053] The magnetic fluid seal 100 is used to close the annular gap between the shaft 400 made of magnets and the housing 500 having the shaft hole 501 passing through the shaft 400 . An annular groove 401 is provided on the outer peripheral surface of the shaft 400 , and a plurality of annular protrusions 402 are provided in the annular groove 401 . Moreover, in this embodiment, the plurality of annular protrusions 402 are divided into the first annular protrusion group 411 provided on the atmospheri...

Embodiment 2

[0069] In the first embodiment described above, the structure in which the end surface in the axial direction of the spacer and the end surface in the axial direction of the bearing are in surface contact is shown. On the other hand, Example 2 shows a structure in which the washer is provided with an engaging portion that engages with the outer peripheral surface of the bearing. Below, use image 3 Example 2 will be described. In addition, the same reference numerals are assigned to the same structures as those in the first embodiment described above, and description thereof will be omitted. Moreover, the functions of the same structure are substantially the same.

[0070] image 3 shows the schematic structure of the magnetic fluid seal 200 of the second embodiment, and the above-mentioned figure 1The same cross-sectional diagram. The annular first spacer 240 provided on the atmospheric side A of the magnetic pole member 120 is provided with an engaging portion 141 enga...

Embodiment 3

[0074] In the first embodiment described above, the cylindrical portion provided at both ends of the magnetic pole member radially engages with the engaging portion of the spacer. In contrast, Example 3 shows a configuration in which the cylindrical portion of the magnetic pole member is engaged with the outer peripheral surface of the bearing without using a spacer. Below, use Figure 4 Example 3 will be described. In addition, the same reference numerals are assigned to the same configurations as those in the first embodiment described above, and description thereof will be omitted. Moreover, the functions of the same configuration are also substantially the same.

[0075] Figure 4 shows that the schematic structure of the magnetic fluid seal 300 of the third embodiment is the same as that of the above-mentioned figure 1 The same cross-sectional schematic. The magnetic pole member 320 made of a magnet is the same as the magnetic pole member 120 in the first embodiment...

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Abstract

Provided is an assembly method in which movement of a magnetic pole member can be suppressed by magnetic force from an attached magnetic-field-forming member when a ferrofluid seal is assembled in which holding parts for a ferrofluid are provided on both sides of a magnetic-field-forming member. A method for assembling a ferrofluid seal (100) provided with a magnetic-field-forming member (130) divided in a circumferential direction, a magnetic pole member (120) having a pair of ferrofluid holding parts (121, 122) and a linking part (123) for linking the holding parts, a first bearing (160), and a second bearing (170), wherein the following steps are performed in sequence: a step for securing the first bearing (160) to a shaft (400) such that the shaft (400) faces toward a vertical direction; a step for attaching the magnetic pole member (120) from above the first bearing (160); a step for securing the second bearing (170) on the shaft (400) from above the magnetic pole member (120), thereby securing the magnetic pole member (120) in a state of being positioned relative to the shaft (400); and a step for attaching the magnetic-field-forming member (130) between the pair of ferrofluid holding parts (121, 122).

Description

technical field [0001] The invention relates to an assembly method of a magnetic fluid seal for closing an annular gap between a shaft and a casing having a shaft hole through which the shaft passes, and a magnetic fluid seal assembled based on the method. Background technique [0002] Conventionally, there is known a magnetic fluid seal that seals an annular gap between a shaft and a shaft hole of a housing with a magnetic fluid held by a magnetic force (see Patent Document 1). The magnetic fluid seal disclosed in Patent Document 1 is provided with an annular permanent magnet having magnetic poles at both ends in the axial direction, and a pair of magnetic pole members holding magnetic fluid on both axial sides of the permanent magnet. According to the above configuration, since the permanent magnet, the pair of magnetic pole pieces and the shaft formed by the magnets are connected to each other to form a magnetic circuit, the magnetic fluid can be stably held between the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J15/43F16C33/78F16C35/07
CPCF16C33/78F16C35/07F16C33/765F16J15/43F16C33/762
Inventor 佐藤和彦
Owner EAGLEBURGMANN JAPAN