WO2011143980A1

WO2011143980A1 - Magnetorheological fluid sealing method and device for lift magnetorheological fluid arrester

Info

Publication number: WO2011143980A1
Application number: PCT/CN2011/072725
Authority: WO
Inventors: 张安戈
Original assignee: 沈阳优力机电设备有限公司
Priority date: 2010-05-18
Filing date: 2011-04-13
Publication date: 2011-11-24
Also published as: CN102252095A; CN102252095B

Abstract

A magnetorheological fluid sealing method and device for a lift magnetorheological fluid arrester is disclosed. The method includes: a magnetorheological fluid is filled in a gap (20) between a rotor and a stator of the arrester; a magnetic field is formed at each end of the gap in which the magnetorheological fluid is filled; the magnetic fields have no more than such a magnetic flux that the magnetorheological fluid of both ends of the gap becomes viscous. The method and device have following advantages: they utilizes a filled liquid magnetic current itself as a sealing ring to realize an non-contact sealing, so that the abrasion problem after long time use is eliminated, and the problem of leakage of a magnetorheological fluid after a sealing ring is damaged is fundamentally resolved.

Description

Magnetorheological fluid sealing method and sealing device for elevator magnetorheological fluid brake

The invention relates to a sealing method and device for an elevator brake, in particular to a magnetorheological fluid sealing method and a sealing device on an elevator magnetorheological fluid brake.

Background technique

WO2009/032014 discloses an "elevator magnetorheological fluid brake", which solves the technical problem that: the elevator brake generates friction between the brake friction plate and the moving plate, and the brake pad is susceptible to being used for a long time. abrasion. Its technical solution is: Injection of a brake fluid-magneto-yheologival fluid in the gap between the stator and the rotor. A magnetorheological fluid is a magnetic particle in a suspension, which may for example consist of 85 wt% magnetic particles and 15 wt% liquid. When the elevator is running, when the synthetic magnetic flux of the permanent magnet and the energized coil is 0, the magnetorheological fluid is in a liquid state, and the rotor operates in a non-friction state; when the synthetic magnetic flux is gradually increased by the control coil, the magnetorheological fluid The viscosity gradually increases until it solidifies into a solid, and the rotor is fixed, so that it is repeated. Since the magnetorheological fluid is liquid when the elevator is running, it is necessary to solve the sealing problem by realizing the object of the invention. Otherwise, the liquid magnetorheological fluid will leak, resulting in the loss of brake fluid, and thus the brake failure, and the brake failure for the elevator. It is a fatal problem. To this end, the sealing means disclosed herein is that "the seal 41 is sealed between the rotor 38 and the main engine shaft 36, and between the rotor 38 and the brake casing 40 to prevent the brake fluid 30 from flowing out of the chamber 39". Figure 9 shows that the seal 41 is a ring and, unless otherwise stated, is generally understood to be a seal ring, i.e., a contact seal. The defect of the seal ring is that it will be damaged after a long time of wear, resulting in leakage of the magnetorheological fluid.

Summary of the invention

In order to solve the problem of magnetorheological fluid leakage, an object of the present invention is to provide a magnetorheological fluid sealing method and a sealing device for an elevator magnetorheological fluid brake.

The object of the invention is achieved in this way:

First, the sealing method is:

1. Magnetizing rheological fluid in the gap between the elevator brake rotor and the stator;

2. A magnetic field is formed at each end of the gap in which the magnetorheological fluid is injected, and the magnetic flux of the magnetic field is limited by the viscous shape of the magnetorheological fluid at both ends of the slit.

2. The sealing device provided by the above sealing method is - the device for forming a magnetic field is provided with an annular sealing member at both ends of the slit into which the magnetorheological fluid has been injected, and the annular sealing member is made of a sealing magnet (permanent magnet) Or a coil) and a sealed magnetic pole; the seal assembly is fixed to the rotor assembly or the stator assembly and has a gap with the stator or the rotor.

When the elevator is running, the magnetorheological fluid in the entire gap is liquid, but under the action of the sealing magnet and the sealing magnetic pole at both ends of the slit, the magnetorheological fluid at both ends of the slit is kept viscous and becomes a sealing ring. Liquid in the gap Magnetorheological fluid seal.

Compared with WO2009/032014, the invention has the beneficial effects that: it utilizes the injected magnetorheological fluid itself as a sealing ring, realizes contactless sealing, has no problem of being worn after prolonged use, and fundamentally solves the sealing. The problem of magnetorheological fluid leakage after ring damage.

DRAWINGS

The invention and the sealing device embodying the invention will be further described with reference to the accompanying drawings.

Figure 1 is a schematic view showing the structure of an outer rotor and an inner stator brake.

Figure 2 is a schematic view of the magnetic flux of the brake permanent magnet of Figure 1.

Figure 3 is a schematic illustration of the magnetic flux of the brake coil of Figure 1.

Fig. 4 is a view showing the composite magnetic flux of Fig. 1 when the brake gap is zero.

Figure 5 is a schematic illustration of the magnetic field flux of the sealing device of Figure 1.

Figure 6 is a schematic view showing the structure of the inner rotor and the outer stator brake.

detailed description

Embodiment 1: The sealing device is used on the brakes of the outer rotor and the inner stator

Referring to Fig. 1, the stator assembly is: a stator yoke 4, a brake coil 18, a brake permanent magnet 19, and non-magnetic gaps 13 and 21, which are fixed to the stator holder 7. The rotor assembly is: a rotor casing 1, a rotor yoke 2, a rotor casing baffle 3, a rotor casing back cap 10, and a drive shaft 11 fixed thereto. A gap between the rotor yoke and the stator yoke 20 is filled with magnetorheological fluid.

The annular seal assembly is an annular seal permanent magnet or coil 6 which is radially sandwiched between two annular seal poles 5 and 8, wherein the surface of the first seal pole 5 has one or more tips. In this embodiment, there are two tooth tips 51, which are two-stage seals, and the tooth tips 51 and the stator yoke 4 are left with gaps, and two annular seal assemblies are respectively disposed at two ends of the slit 20 into which the magnetorheological fluid has been injected. It is fixed to the rotor housing 1.

When there is no current in the coil 18, the main magnetic flux of the permanent magnet 19 is as shown in FIG. At this time, the magnetorheological fluid in the gap 20 is magnetized to be viscous, and a braking force is generated between the stator yoke 4 and the rotor yoke 2; when there is a current in the coil 18, the main magnetic flux of the coil 18 is as shown in the figure 3 is shown. In the gap 20, the direction of the main magnetic flux of the permanent magnet 19 is opposite.

The direction and magnitude of the current in the coil 18 are controlled so that the main magnetic flux of the coil 18 and the main magnetic flux of the permanent magnet 19 have a resultant magnetic flux in the gap 20 as shown in Fig. 4. At this time, the magnetorheological fluid in the gap 20 becomes a fluid due to the loss of magnetization, and the braking force is lost between the stator yoke 4 and the rotor yoke 2. Therefore, when there is no current in the control coil 18, it is equivalent to the brake being braked, and when there is current in the control coil 18, it is equivalent to the brake being released.

Referring to FIG. 5, the main magnetic flux of the sealing permanent magnet 6 is closed by the first sealing magnetic pole 5, the gap 20, the stator yoke 4, and the second sealing magnetic pole 8, and a maximum magnetic flux is formed at the tooth tip 51 of the first sealing magnetic pole 5. density. The magnetorheological fluid in the gap 20 is locally magnetized at the tip of the tooth to form a viscous 0-shaped seal ring, blocking the magnetorheological fluid in the gap 20. The leaking channel acts as a seal.

This example is a two-stage single-sided sealing structure. Multi-stage seals or multi-stage double-sided seals can be used when greater sealing capacity is required.

Embodiment 2: The sealing device is used on the brakes of the outer stator and the inner rotor

Referring to Fig. 6, the stator assembly is: stator yokes 21 and 22, brake coil 40 and non-magnetic gap 41, which are fixed to the stator bracket 27. The rotor assembly is: a rotor yoke 23, a brake permanent magnet 37, and a bushing 29, which are fixed to the drive shaft 30. The gap 38 between the rotor yoke 23 and the stator yoke 21 is filled with a magnetorheological fluid.

The annular seal assembly is an annular seal permanent magnet or coil 25 which is radially sandwiched between two annular seal poles 24 and 26, and two annular seal assemblies are respectively disposed on the injected magnetorheological fluid Both ends of the slit 38 are fixed to the stator holder 27, wherein the surface of the first sealing magnetic pole 24 has a tooth tip 241, and the tooth tip 241 has a gap with the rotor yoke 23.

The working mode is the same as that in the first embodiment.

Claims

Rights request

A magnetorheological fluid sealing method for an elevator magnetorheological fluid brake, characterized in that: a magneto-rheological fluid is injected in a gap between a brake rotor and a stator; at each end of a gap in which a magnetorheological fluid is injected A magnetic field is formed, and the magnetic flux of the magnetic field is limited by the viscous shape of the magnetorheological fluid at both ends of the slit.

2. A sealing device provided by the magnetorheological fluid sealing method of an elevator magnetorheological fluid brake according to claim 1, wherein: the means for forming a magnetic field is disposed at both ends of the slit into which the magnetorheological fluid has been injected. An annular seal assembly consisting of a sealing magnet and a sealing magnetic pole; the sealing assembly is fixed to the rotor assembly or the stator assembly and has a gap with the stator or the rotor.

3. The sealing device provided by the magnetorheological fluid sealing method of an elevator magnetorheological fluid brake according to claim 2, wherein: said annular seal assembly is an annular seal permanent magnet or a coil according to a radial direction The utility model is sandwiched between two annular sealing magnetic poles, and the annular sealing component is fixed on the rotor casing, wherein the surface of the first sealing magnetic pole has one or more tooth tips, and the tooth tip and the stator yoke have a gap.

A sealing device provided by a magnetorheological fluid sealing method for an elevator magnetorheological fluid brake according to claim 2, wherein: said annular seal assembly is an annular seal permanent magnet or a coil according to a radial direction The utility model is sandwiched between two annular sealing magnetic poles, and the annular sealing assembly is fixed on the stator bracket, wherein the surface of the first sealing magnetic pole has a tooth tip, and the tooth tip has a gap with the rotor yoke.