CN87209424U

CN87209424U - Polytetrafluoroethylene sealing ring

Info

Publication number: CN87209424U
Application number: CN 87209424
Authority: CN
Inventors: 范正元
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-06-19
Filing date: 1987-06-19
Publication date: 1988-02-03

Abstract

The utility model discloses an O type sealing ring, which is especially applied to the sealing of hydraulic and pneumatic elements. The O type seal ring which is frequently used in the air cylinder is made of rubber or a layer of polytetrafluoroethylene film with which the rubber serving as inner liner is coated along the outboard porch; frictional drag of the former one is big and the service lift is short; the latter one can not be used as sealing of hydraulic and pneumatic elements. The utility model is a smooth closed type cover through cementing, pressing, solidifying, sanding after the joints coated with the polytetrafluoroethylene are treated by surface treating agent and are painted with epoxy agglomerant. The seal ring has the advantages of small friction coefficient and aging resistance, and the service life is 1500 kilometers more than the piston travel.

Description

Polytetrafluoroethylene sealing ring

The utility model relates to a kind of sticking compound teflon zero RunddichtringO, and it is specially adapted to the sealing of hydraulic pressure, pneumatic element.

Seal ring is one of key part that guarantees the cylinder operation quality.Zero RunddichtringO that in the past was used for cylinder seal is generally made with rubber.There are problems such as frictional resistance is big, sensitive low, required pressure is big when starting, and temperature accommodation is little, and working life is short in rubber seal.In order to reduce the friction between sealing rubber ring and the cylinder wall, wrap up in multiple one deck or partly wrap up in multiple one deck poly tetrafluoroethylene at zero type rubber ring skin, though this method has reduced frictional resistance, but the former is an opening because wrap up in multiple layer, interior rubber lining ring can be easily aging because of the infiltration of medium, and can not be used for the motive sealing of pneumatic element; Though the latter can be used for motive sealing, because only at the topped one deck teflon of rubber ring outer part book film, seal element is when reciprocating, this book film easily comes off and loses sealing, and working life is short.

The objective of the invention is to, hope is handled through certain way by the teflon book film that will wrap up in compound seal ring outer, make it can utilize general Bond just its open part can be bondd firmly, become and wrap up in the compound sticking compound seal ring that is, overcome shortcomings such as short, interior rubber lining of its sealing that can not be used for hydraulic pressure, pneumatic element and life-span is easily aging.Both be applicable to static seal, motive sealing thereby reach, and be suitable for use as the purpose of hydraulic pressure, pneumatic element sealing again.

Solution of the present utility model is to utilize the nitrile rubber circle to make wadding, with teflon book film it cladded, and super head.To surpass two ptfe surfaces that head part is in contact with one another then and handle, and make its surface become polarity, again with general Bond bonding by inertia with primer.Thereby the acquisition higher bonding strength solves thus and wraps up in compound teflon seal ring and can not be used for the pneumatic element sealing, compoundly causes sealing unreliable and disadvantage such as lack working life because of easily coming off and partly wrap up in.

The utility model is to wrap up in again the teflon on the rubber ring outer or the super head part of filled polytetrafluoroethylene, with acetone that two surface clean are clean earlier, airing, be applied to the ptfe surface primer on the surface equably then, left standstill 1-3 minute, clean with acetone again, final rinse water is clean, airing (also available cotton is dipped in acetone and dries).Surface after the processing can bond.If temporary transient non-caked then can keep in Dark Place stand-by; General Bonds such as epoxy can be coated equably during bonding in two surfaces after surface treatment, strickling, pressing, putting into 60 ℃ of baking ovens again solidified one hour or solidified two days under 25 ℃ of room temperatures, at last with polishing such as crosus cloth joint part till smooth, can use.

Sticking compound teflon seal ring friction factor only is 0.035～0.04, and wear-resisting, ageing-resistant, does not in use have adhesion, obscission generation, and be zero shape rubber seal 10 times or more greater than 1500 kilometers of piston strokes working life.

Embodiment

Be that the sticking concrete making method of teflon zero RunddichtringO (promptly the external diameter of zero type circle is 50mm, and the ring cross-sectional diameter is 5.7mm) again of 50mm * φ 5.7mm is described below now with regard to specification:

With graphitiferous 2.5%, bronze 8%, glass fibre 14.5%, the filled polytetrafluoroethylene tubing of teflon 75% is sandwiched in finish turning outer on the lathe, and the specification of tubing is φ 40 * φ 20 * 100mm.Then the liner nitrile rubber circle 2 of φ 49.5 * φ 5.2mm is placed on the tubing behind the finish turning, utilize that right R cutter strips the teflon skin, the depth of cut is 25mm, along with feed, the teflon skin is rolled the liner cushion rubber is cladded, to feed 15mm, stop, move back right R cutter, utilize left R cutter peeling off fully until the teflon skin more simultaneously from the anti-car of mouth of pipe 23mm place's feed 0.25mm.This moment, teflon skin 1 was with the cladding of liner cushion rubber, wherein overlap 3 wide about 5mm.Take off this ring, with acetone that teflon two surface clean that overlap is in contact with one another are clean, with glass rod " ptfe surface primer " (Chenguang Chemical Industry Inst. No. 1 Branch, Ministry of Chemical Industry's production) is applied to two surfaces equably behind the airing, left standstill 1-3 minute, clean with acetone again, clean the back water and rinse well and dip in acetone with cotton water polo is dried.Then DG-3S contact glue (production of one branch of morning twilight chemical industry institute of the Ministry of Chemical Industry) is coated two surfaces for the two component glue of first: second=2:1 after mixing in proportion equably, strickling, pressing, send into again in 60 ℃ of baking ovens and solidified 1 hour, take out then and joint is polished smooth with emery cloth.

The sealing ring is used for testing in the cylinder of QGA type 300mm * 50mm, is 1.2m/s in air dielectric, room temperature, unlubricated and speed, and pressure is 8kg/cm ²Condition under, its starting pressure only is 0.4-0.5kg/cm ², be more than 1500 kilometers of piston stroke working life.

Description of drawings:

Fig. 1: seal ring plan view;

Fig. 2: seal ring sectional view.

Claims

1, a kind of teflon O RunddichtringO, it is made up of elastometric lining, teflon cladding, and the joint part that it is characterized in that this O type circle cladding becomes smooth through encapsulation process, the sticking multiple teflon O RunddichtringO of sealed type.