JPS6015825B2 - magnetic sealing device - Google Patents

Description

Detailed Description of the Invention The present invention comprises a support part made of metal or synthetic resin and having a rectangular cross section, and a sealing element movable at right angles to the surface to be sealed, which is placed on this support part. The present invention relates to a sealing device for gaps between two mutually moving machine parts, in particular used as a sealing device.

From DE 23 39 353 A1 a sealing ring is known which consists of a housing in which a fleece sealing device is arranged.

During assembly, this fleece-sealing diamond is expanded onto the shaft in a trumpet-like manner and is subjected to internal pretension to assist in sealing against the opposing surface. However, as in all known elastic materials, in this case too a relaxation phenomenon occurs already after a relatively short time, so in order to maintain the sufficient pressing force for a longer time, e.g. helical springs or foam It was necessary to use a second support element, such as a material back lining. However, the results achieved by such measures have hitherto been unsatisfactory. Such sealing rings have often been damaged by leakage, especially as a result of dimensional changes due to wear of the sealing member lip. The object of the invention is to eliminate this drawback and to provide an operation as described above which guarantees a similar and uniform pressing force over the entire operating period, which is determined by the wear of the surface sealing elements, without being bound to the usual use of fleece sealing devices. Our goal is to provide style sealing elements.

According to the present invention, the support part and the sealing element are provided with an element having permanent magnetism, and the sealing element is moved relative to the mechanical part by the magnetic repulsion between these two magnetic bodies. This can be solved by pressing the button.

In this case, according to the invention, it is provided that an elastic, permanently magnetic layer is provided on or in the surface of the surface-sealing element which is remote from the relatively moving mechanical parts. A fixed permanent magnet is additionally arranged in the support part, the side surface of which faces the surface-sealed element exhibiting the same magnetic polarity as the side surface of the magnetic layer of the surface-sealed element that faces the permanent magnet. This has been found to be particularly suitable. Special fleeces or fabrics are suitable for forming the surface sealing element, the pores of which can additionally contain damping material.

Furthermore, it is possible to use surface sealing elements made of elastic materials with sufficient damping properties, for example made of boritetrafluoroethylene. In FIG. 1, a conventional sealing device is shown.

This sealing device consists of a support part 1 and a surface sealing element 2 arranged on this support part, on which surface 22, which can be separated from a mechanical part 4 in relative movement, an elastic and permanent A magnetic layer is provided. A prerequisite for this function is that the element 4 to be sealed is magnetizable. In FIG. 2 an embodiment of a magnetic sealing device according to the invention is shown, the function of which is independent of the magnetizability of the elements 4 in relative motion.

However, the invention can be configured not only for rotationally symmetrical sealing devices, but also for sealing offset cross-sections or straight edges. This sealing device consists of supporting part 1
1 in that a permanent magnet 3 is additionally disposed within the sealing element 2, and its side surface 22 facing the magnet layer of the sealing element 2 exhibits the same magnetic polarity as the surface of the magnet layer. This is fundamentally different from the conventional example shown in which sealing is performed using magnetic attraction force. This sealing element 2 is pressed against the sealing surface by the magnetic repulsion force generated in this way. The support portion 1' of the sealing element 2 can be made of metal or synthetic resin. The advantage of using a plastic support part is that it can be injected directly onto the element to be sealed, without requiring a separate working step during assembly. - To form the elastic surface sealing element 2, it is important to use a particularly certified fleece material, if necessary with a raised surface. In the embodiment shown in FIG. 2, it is necessary to incorporate a fluid-impermeable layer within the surface sealing element. Depending on the purpose of use, it may be helpful to additionally embed a damping material within the fleece material. The advantages obtained with the magnetic sealing device of the invention are, in particular, that it guarantees the achievement of a pressing force with high uniformity on the surface sealing element and over the entire operating period, which is determined by the wear of the surface sealing element. It is said that it will be done.

In addition to this, it is particularly important that all embodiments allow particularly large relative displacements of the sealing surfaces in the radial direction. The inventive use of the invention is therefore extremely advantageous in cases where the shaft often has to be operated at critical rotational speeds with high vibrations. Further, according to the present invention, since the surface sealing element 2 is pressed against the element 4 such as a shaft using magnetic repulsion to achieve sealing, the element 4 is made of a non-magnetized material. There is an advantage that even if there is a seal, it can be sealed properly.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional magnetic sealing device, and FIG. 2 is a cross-sectional view of a preferred embodiment of the magnetic sealing device of the present invention. DESCRIPTION OF SYMBOLS 1...Supporting member, 2...Surface sealing element, 3...Permanent magnet, 4...Mechanical part which moves relatively, 22... Layer having magnetism. Figure 1 Figure 2

Claims (1)

[Claims] 1. A flexible sealing element formed of a support part 1 having a rectangular cross section and a layer 22 fixed to the support part and whose surface remote from the surface to be sealed is elastic and permanently magnetic. 2, a fixed permanent magnet 3 is disposed in the support part 1, and a side surface of the magnet 3 facing the surface sealing element 2 and , the permanent magnet 3 of the magnetic layer 22 of the surface sealing element 2
1. A magnetic sealing device characterized in that a side surface facing the side surface exhibits the same magnetic polarity. 2. The magnetic sealing device according to claim 1, wherein the surface sealing element 2 is a fleece material with a fluffed sealing surface.