KR100390706B1 - Rotary lip type seal assembly - Google Patents

Abstract

The rotary lip seal assembly of the present invention is composed of a triple structure consisting of two poly seals made of fluorocarbon resin and one rubber boot, which can increase wear resistance and extend life due to load dispersion effect due to an increase in contact area. In addition, the space provided between the parts can be filled with a grease prepack to increase the sealing effect and reduce the frictional resistance at high speed. The seal assembly includes first and second casings 10 disposed within the casing 10 via a casing 10 made of metal, such as aluminum, and a first metal ring 30 for providing a space in which a grease prepack is filled. Concentrically with the second fluororesin poly seal 22 via a fluororesin poly seal 20, 22 and a second metal ring 32 for providing a space portion in which the grease prepacks 26, 28 are filled. It consists of the rubber boot 24 arrange | positioned.

Description

ROTARY LIP TYPE SEAL ASSEMBLY

The present invention relates to a rotary lip seal assembly, and more particularly, two polyseals made of fluorocarbon resin and rubber boots are arranged in sequence, and a metal ring is inserted therebetween to provide a predetermined space. A rotating lip seal assembly that can be filled with grease to increase sealing and wear resistance and extend overall life.

Generally, seals for airtightness are used for devices requiring compression and airtightness, such as a compressor for compressing air. Representative seals used in compressors include rotary lip type seals, which are provided with a fluororesin seal and a rubber boot. In the case of the seal, the airtightness is maintained to some extent in the low-speed rotation section, but the airtightness is reduced in the high-speed rotation section, so that when operating at a high rotational speed for a long time, there is a problem of shortening the service life due to a decrease in wear resistance.

In particular, since the contact area between the continuously reciprocating shaft and the seal is small, the load distribution effect is low, resulting in a high wear rate of the part subjected to the concentrated load, resulting in a shortened life. In addition, in the case of conventional seals, the fluororesin seal and the casing surrounding the rubber boot are made of non-metallic materials such as plastic or rubber, and are deformed by the pressure applied when the shaft rotates, so that the concentric state of the shaft and the cylinder is precise. It is not retained, which causes a decrease in airtightness.

The present invention to solve this problem is to increase the contact area between the shaft and the seal to distribute the load to a wider area to prevent wear due to concentrated load to increase the overall life, while at the same time between the metal ring between the seal parts It is an object of the present invention to provide a rotary lip seal assembly that can be filled with a space, and then filled with a grease free pack to improve airtightness and further increase wear resistance.

1 is a cross-sectional view showing the configuration of a rotary lip seal assembly according to the present invention,

2 is a side view of the seal shown in FIG. 1 seen from one side;

Figure 3 is a cross-sectional view showing the mounting state of the rotary lip seal assembly according to the present invention.

♣ Explanation of symbols for main part of drawing ♣

10: metal casing 12: cutting edge

14: Crimping end 16: Rubber gasket

20, 22: First and second polish seals 24: Rubber boots

26, 28: Greece 30, 32, 34: Metal ring

The object of the present invention described above is a first and a second fluororesin polish and a grease disposed in the casing via a metal casing such as aluminum, and a first metal ring for providing a space portion in which a grease prepack is filled. And a rubber boot disposed concentrically with the second fluororesin polyseal via a second metal ring for providing a space portion in which the prepack is filled.

Hereinafter, a rotary lip seal assembly according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view showing the configuration of a rotary lip seal assembly according to the present invention, Figure 3 is a side view of Figure 1, Figure 3 is a cross-sectional view showing a mounting state of the rotary lip seal assembly according to the present invention.

As shown in these figures, in order to improve the airtightness and abrasion resistance and to extend the overall life of the seal, the preferred embodiment of the present invention employs a rotary lip seal assembly having a triple structure, and instead of the conventional nonmetallic material. By employing a metal casing 10 such as aluminum to increase the strength, the center between the shaft 42 and the cylinder 10 is always maintained.

To this end, the rubber boot 24 is arranged concentrically with the first and second fluororesin poly seals 20 and 22 in the casing 10 made of a metal material such as aluminum, and the first and second parts are arranged in order. And inserting the second metal rings 30 and 32 to provide a space portion in which the grease prepack is filled.

Here, the first and second fluororesin poly seals 20 and 22 support the rubber boot 24 of the rotary lip seal assembly of the present invention, which can double the performance of the seal and have high wear resistance and low coefficient of friction. have. In addition, as shown in FIG. 2, the polyseals 20, 22 are supported by the rubber boots 24 and are supported at three points over a wider and flatr area between the shafts 42 and are transmitted from the shafts 42. The load is widely distributed, and the wear resistance is improved by the load dispersion effect to extend the service life.

In addition, the rubber boot 24 minimizes leakage and friction by performing a tight sealing function between the friction surface with the shaft 42 to improve the airtightness of the medium. Since the rubber boot 24 is supported by the fluororesin poly seals 20 and 22 in duplicate, the effect of providing a complicated maze so that the medium can be bypassed can be obtained, which helps to improve airtightness.

Here, a space portion in which the grease prepack 26 is filled by the first metal ring 30 is provided between the first and second fluorine resin poly seals 20 and 22 disposed in the casing 10. The space between the second fluorine resin sealant and the rubber boot 24 is filled with a grease prepack 28 by the second metal ring 32.

Thus, since the grease prepacks 26 and 28 are filled in the spaces formed between the parts by the first and second metal rings 30 and 32, the fluororesin poly seals 20 and 22 and the rubber boot ( 24) A tight barrier is formed between them to prevent leakage, thereby improving airtightness. In addition, these grease packs 26 and 28, which act as lubricants, fill grease in every corner of the cavity generated by centrifugal force acting at high speed, thereby reducing friction and wear.

In addition, a rubber gasket 16 is disposed between the inner surface of one side of the casing 10 and the first fluororesin poly seal 20, so that direct contact between the casing 10 and the first fluororesin poly seal 20 is prevented. Prevented. In addition, a third metal ring 34 is inserted between the other inner surface of the casing 10 and the rubber boot 24 so that the state in which the fluorine rubber boot 24 is fixed to the inner surface of the casing 10 is maintained accurately. .

One end of the casing 10 prevents the rubber gasket 16 from being detached and simultaneously prevents the flow of the first and second fluorine resin poly seals 20 and 22 and the rubber boot 24 to be held in place. The wedge end 12 is formed, and the other end of the casing 10 is formed with a crimping end 14 for preventing separation of the third metal ring 34. The crimping end 14, which serves to fix the central axis, is formed by installing a seal component inside the casing 10 in a state as shown by a virtual line, and then folding and crimping as shown by a solid line.

In the preferred embodiment of the present invention described above has been described with respect to the rotary lip seal assembly consisting of two poly-seal and one rubber boot, those skilled in the art without departing from the spirit of the present invention It will be understood that modifications, changes, additions, and the like are possible, and such modifications should be regarded as falling within the scope of the following claims.

According to the present invention described above, it is possible to increase the wear resistance and extend the life due to the load-dispersing effect of increasing the contact area by providing a three-layer seal consisting of two poly seals made of fluorocarbon resin and one rubber boot. have. In addition, a space is provided between the parts by inserting a metal ring, and the space is filled with a grease prepack to increase the sealing effect and to reduce the frictional resistance at high speed.

In addition, a rubber gasket can be inserted between the poly seal and the inner surface of the casing to prevent direct contact between the seal and the casing. The one side of the casing is formed with a wedge to maximize the sealing effect by ensuring that all components are always in an optimal position. There is an advantage to this.

Claims (3)

A casing 10 made of metal such as aluminum, Inside the casing 10, the first and second fluororesin poly seals 20 and 22 are disposed while maintaining a predetermined interval, A first metal ring 30 is provided between the first fluororesin poly seal 20 and the second fluororesin poly seal 22 to provide a space in which a grease free pack 26 is filled. A second metal ring 32 is provided on the bottom of the bifluorinated resin seal 22 to provide a space in which the grease free pack 28 is filled. Rotating lip seal assembly, characterized in that the rubber boot (24) is disposed concentrically with the second fluororesin poly seal (22) on the bottom of the second metal ring (32). The method of claim 1, A rubber gasket 16 is disposed between one inner surface of the casing 10 and the first fluororesin poly seal 20. Rotating lip seal assembly, characterized in that the third metal ring (34) is disposed between the other inner surface of the casing (10) and the rubber boot (24). The method according to claim 1 or 2, One end of the casing 10 prevents the rubber gasket 16 from being detached and simultaneously prevents the flow of the first and second fluorine resin poly seals 20 and 22 and the rubber boot 24 in place. Is provided with a wedge end 12 to be maintained in, Rotating lip seal assembly, characterized in that the other end of the casing (10) is provided with a pressing end (14) for preventing the separation of the third metal ring (34).