CN2526603Y

CN2526603Y - Semi-armoured sealer

Info

Publication number: CN2526603Y
Application number: CN 01233457
Authority: CN
Inventors: 李勇涛
Original assignee: Individual
Current assignee: Room 505 House 113 Nanxinyuanzhong Road Chaoyan
Priority date: 2001-08-20
Filing date: 2001-08-20
Publication date: 2002-12-18
Anticipated expiration: 2011-08-20

Abstract

The utility model relates to a semi-armor style seal device, belonging to a seal device used for a piston and a piston rod of a hydraulic cylinder in a hydraulic machine. The utility model can solve the problems of the prior art that a high pressure seal device has large replacement resistance; a Y-shaped ring with small replacement resistance is easy to be overturned and torn. The utility model comprises a slide ring 2 and a Y-shaped ring 3. The slide ring 2 takes the shape of a round ring and has a transverse section with a right-angle shape, and a right-angled section on an inner surface is provided with a round angle. The Y-shaped ring 3 is made of rubber and is provided with a section resembling Y-shape, and a boss is arranged at one end of an outer lip of the Y-shaped ring while the other end thereof is provided with a round angle. The slide ring 2 is arranged at the round angle end of the Y-shaped ring 3, and the boss is exposed and directly touches a cylinder wall 1. The slide ring 2 has low friction coefficient, which can reduce resistance, and the boss made of rubber is flexible and is capable of enhancing seal capability, so the semi-armor style seal device has excellent overall seal capability, and the device can be widely applied to existing various hydraulic devices which adopt Y-shaped rings (comprising Y x shaped rings).

Description

Half armoured type seal arrangement

Technical field:

The utility model belongs to the seal arrangement in hydraulic transmission or the Pneumatic Transmission, is particularly suitable for the sealing of high pressure, low surface friction drag.

Background technique:

In prior art, as the cydariform circle, O shape circle, the Daniela Hunger seal ring, slip-ring seal circle (China Patent No. ZL 92 2 04643.3) and three-ring type seal arrangement seal arrangements such as (China Patent No. ZL98218911.7) are to lean on the precompressed amount of rubber parts to realize sealing, so this class seal arrangement during generally at return stroke or in zero load surface friction drag bigger, not too be suitable for sometimes in liquid (gas) cylinder pressure less, using by spring, deadweight, the strength that resets such as manual.What extensively adopt in these liquid (gas) cylinder pressure at present is Y shape (containing Yx shape) seal ring etc., this class seal ring is by fluid pressure the slidingsurface that the lip of Y shape circle is pressed on cylinder body or piston rod to be realized sealing, in return stroke or when zero load because fluid pressure drops to zero, so its surface friction drag is less when resetting, but also has easy accessibility, advantage such as price is low.But be directly proportional with fluid pressure because the surface friction drag on the moving surface of this class cushion rubber is approximate, and the friction factor between rubber and the metal is bigger again, so when overpressure, can tear or make its upset to Y shape rubber ring because of surface friction drag is excessive.

Summary of the invention:

The purpose of half armoured type seal arrangement is exactly in order to overcome the deficiencies in the prior art, and a kind of both had less reset resistance or unloaded resistance, seal arrangement that can be high pressure resistant again are provided.The purpose of this utility model realizes by following technical measures: half armoured type seal arrangement includes slip ring 2 and Y shape circle 3 two-part.Slip ring 2 is that the transverse section is the annulus of right angle type.The sealing device that is used for piston seal, the outer round surface of its slip ring contacts with cylinder body 1, and internal surface contacts with the outer surface of the fillet R of Y shape circle 3.The material of making slip ring 2 is to select for use to have higher-strength and have macromolecular material than low coefficient of friction simultaneously.The Y shape circle 3 that half armoured type seal arrangement is used is that the transverse section is the annulus of " Y " shape.It is to make with whippy but material that friction factor is higher such as oil resistant rubber.It is characterized in that, one end of Y shape circle 3 has boss 5, the other end has fillet (or chamfering) R, slip ring 2 is enclosed within the end of Y shape circle 3 band fillet R, encase the band fillet an end and boss 5 is exposed, boss 5 on the Y shape circle 3 is positioned at the end of the outer lip of Y shape circle 3, and the place, interior right angle of slip ring 2 has the fillet R (or chamfering) that matches with Y shape circle 3, and the area that encased by slip ring 2 of Y shape circle 3 is greater than the cylindrical area of the boss 5 that exposes.Because the area that is wrapped up by slip ring 2 of Y shape circle 3 is long-pending greater than the outer round surface of the boss 5 that exposes, so just reduced surface friction drag widely, and because the strength ratio Y shape circle 3 of slip ring 2 material therefors is much higher, so under high pressure is difficult for being torn, dashes and wear and turn over.When piston descends or is unloaded, the liquid of piston cavity of resorption is drained, pressure drops to 0, because half armoured type seal arrangement is not by the sealing of precompressed amount, but leaning on fluid pressure that the lip of Y shape circle is pressed to like that, similar Y shape circle realizes sealing on the casing wall, so the positive pressure of slip ring 2 and 5 pairs of cylinder bodies 1 of boss is very little in the utility model,, so just satisfied by spring, deadweight, the necessary little requirement of resistance when manual force resets so surface friction drag is very little.Existing high pressure seals such as sliding ring type combined seal ring (ZL 92 2 04643.3) and Daniela Hunger circle have bigger precompressed amount thereby cylinder body 1 is produced bigger positive pressure by rubber ring realizes sealing, so positive pressure can not reduce yet in return stroke, resistance has limited its general the enclosing of application greatly so Chang Yin resets, so the utility model has just in time remedied its deficiency.

Description of drawings:

Fig. 1 is the erection drawing of the half armoured type seal arrangement used of piston.

Fig. 2 is the partial enlarged drawing of the half armoured type seal arrangement used of piston.

Embodiment:

With reference to figure 1 and Fig. 2: slip ring 2 and Y shape circle 3 are installed in the groove of piston 4 together, the upper-end surface of slip ring 2 contacts with the upper-end surface of the groove of piston 4, the outer round surface of slip ring 2 contacts with the inwall of cylinder body 1, the top of the top of slip ring 2 internal surfaces and Y shape circle outer surface all has fillet R, and these two fillet R coincide together mutually.The internal circular surfaces of Y shape circle 3 closely contacts with the channel bottom of piston 4, forms sealing surface.The lower end surface of Y shape circle 3 promptly in the lower end surface of groove on lower end surface and the piston 4 of outer lip contact.With reference to figure 2, the lower end (outside) of the outer lip of Y shape circle 3 has boss 5, and the outer round surface of boss 5 closely contacts with the inwall of cylinder body 1, forms sealing surface.

When piston cavity of resorption feed liquor, boss 5 on following Y shape circle 3 of the pressure of liquid and whole outer lip partly are pressed on the cylinder body 1 together with slip ring and piston moves up together.Because the friction factor between slip ring 2 and the cylinder body 1 is very little, it is the part of friction factor between Y shape circle and the cylinder body 1 of rubber that material is only arranged, thus be equipped with slip ring half armoured type seal arrangement surface friction drag than common Y shape enclose (containing Yx shape encloses) much smaller.Therefore avoided the problem that Y shape circle under high pressure is torn or is reversed in the prior art effectively.

Claims

1. half armoured type seal arrangement is shaped as the seal arrangement that annulus, transverse section are formed for the Y shape circle (3) of " Y " shape by being shaped as made from the macromolecular material slip ring (2) that annulus, transverse section are right angle type with what materials such as rubber were made, it is characterized in that:

Y shape circle (3) one ends have boss (5), and the other end has fillet (R), and slip ring (2) is enclosed within an end of Y shape circle (3) band fillet (R), encase an end of band fillet and boss (5) is exposed.

2. half armoured type seal arrangement according to claim 1 is characterized in that the boss (5) on the Y shape circle (3) is positioned at the end of the outer lip of Y shape circle (3).

3. half armoured type seal arrangement according to claim 1 is characterized in that the place, interior right angle of slip ring (2) has the fillet (R) that matches with Y shape circle (3), and the area that encased by slip ring (2) of Y shape circle (3) is greater than the cylindrical area of the boss that exposes (5).