CN1115018A

CN1115018A - Combined sealing ring with no-opener sliding ring

Info

Publication number: CN1115018A
Application number: CN 94107403
Authority: CN
Inventors: 郭世杰
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-07-14
Filing date: 1994-07-14
Publication date: 1996-01-17

Abstract

The combined sealing ring including non-open slide ring and "O" shaped rubber ring for dynamic sealing of hydraulic unit and fluid especially for end cover and piston features that said slide ring is made of 8-12% carbon fibre filled teflon and the thickness of the slide ring and the diameter of the rubber ring are specially designed according to the inner diameters of the end cover and the cylinder and the depth and width of the sealing slot. Its advantages include small friction resistance, no leakage and long service life.

Description

Combined sealing ring with no-opener sliding ring

The present invention is applicable to hydraulic pressure and fluid motive sealing, be specially adapted to end cap and piston occasion, comprise the combined sealing ring with no-opener sliding ring of imperforation slip ring and O type cushion rubber.

At present at home, single O type cushion rubber, y-shaped cross-section seal ring and YX tee section seal ring etc. are generally adopted in hydraulic pressure and fluid motive sealing, also have some in O shape cushion rubber side the plastics guard circle to be set.

Because rubber and polyamine fat friction factor big (about 0.4～1), static and dynamic friction coefficient differs 3～4 times approximately, anti-wear and wear-resistant performance is poor, aging easily, corrosion resistance is not good enough, no self-lubricating property, thereby domestic existing sealing configuration ubiquity easily leaks, lack (only having about half a year) working life, the shortcomings such as surface friction drag is big of working.

Someone wants the fluoroplastic of about 0.1 millimeters thick of spraying one deck on O type cushion rubber surface, and with the raising anti-wear and wear-resistant performance, but the anti-wear and wear-resistant performance of fluoroplastic is limited, and can not compensate automatically after the too thin wearing and tearing of coating, thereby working life is not oversize yet.This technology difficulty is big, has severe toxicity concurrently, thereby does not have much use values.

Abroad, adopt the dynamic friction piece of doing sealing configuration by the good filling fluoroplastic slip ring of anti-wear and wear-resistant performance more and more, employing O type cushion rubber is born the fixing seal between cushion rubber and seal groove, cushion rubber and slip ring, by the compression rebounding force of O type cushion rubber is the slip ring motive sealing surface necessary additional pressure of sealing of giving security, and is called the sliding ring type combined seal ring.

Because selected filling fluoroplastic adopt glass, copper powder, graphite, molybdenum disulfide etc. to do compound more, antiwear property is also very limited.

The heat-conducting property of fluoroplastic is poor, and the external slip ring thickness that adopts is about 2.5～2.8 millimeters, and the too thick obvious radiating effect that reduced of slip ring causes slip ring friction surface heating up, makes the slip ring deliquescing, and antiwear property descends, thereby has influenced working life.

Some slip ring has opening, has constituted leakage hidden danger; The sectional shape complexity that also has some slip rings.

U.S. MEA company regulation is used in the oil hydraulic cylinder on breaking of the oil refinery cracking electro-hydraulic slide valve, and continuous operation a year and a half must be changed sealing configuration.

Purpose of the present invention, be to design a kind of combined sealing ring with no-opener sliding ring, the imperforation slip ring that uses special substance and thickness is as dynamic friction piece, as the fixing seals between cushion rubber and seal groove, cushion rubber and slip ring, solve the easy leakage that exists in hydraulic pressure and the fluid motive sealing, the problem that working life is short, the work friction is big with O type cushion rubber.

The inventor is through studies confirm that repeatedly, fill the fluoroplastic of the fluoroplastic, the particularly filling carbon fiber that strengthen, the anti-friction performance improves more than 1,000 times than pure fluoroplastic approximately, it between fluoroplastic and the steel one group of good friction pair, not only friction factor is little but also kinetic friction is close with static friction coefficient, is about 0.04.Filling carbon fiber is better than filling other compound performance.

When filling carbon fiber, fill that content is too high certainly will to increase cost, certainly will reduce the anti-friction performance very little and fill.Thereby the present invention adopts the teflon of filling 8～12% carbon fibers to make the imperforation slip ring, obtains optimum balance at cost and aspect of performance.

The inventor draws the corresponding relation following (unit uses millimeter) of thickness (d1), O type cushion rubber diameter of section (d2), end cap diameter of bore (D1), cylinder barrel diameter of bore (D2), the seal groove degree of depth (H) and the width (B) of imperforation slip ring through experiment repeatedly:

(1). O type cushion rubber is selected GB GB1235-76 for use,

d1 d2 D1 D2 H B

1 3.1 23～45 28～40 3.4±0.1 4±0.2

1.2 3.5 45～50 40～56 3.9±0.1 4.5±0.2

1.5 5.7 50～160 60～170 6.1±0.1 7±0.2

2 8.6 ≥160 ≥170 8.9±0.1 11±0.3

(2). O type cushion rubber is selected GB GB3452.1-82 for use,

d1 d2 D1 D2 H B

1.2 3.56?23～50 28～56 3.94±0.1 4.5±0.2

1.5 5.3 50～140 60～150 5.70±0.1 6.8±0.2

2 7 ≥140 ≥150 7.60±0.1 9±0.3。

Compared with prior art, the present invention has following advantage:

1. simple in structure, surface friction drag is little;

2. there is not leakage, long service life;

3. probationary certificate, the working life of the present invention in oil hydraulic cylinder is more than 6 years.The test that the end of the year 87 and in August, 88, installation was carried out, in July, 94 still on probation;

4. cost is low, economy and durability.

Accompanying drawing 1 is a user mode cross section structure schematic representation of the present invention.

In the accompanying drawings, the 1st, O type cushion rubber, the 2nd, imperforation slip ring

The present invention requires the teflon of the most handy filling 10% carbon fiber of imperforation slip ring (2) to make, and surface finishment should be not less than 6.

Claims

1. combined sealing ring with no-opener sliding ring comprises imperforation slip ring (2) and O type cushion rubber (1), it is characterized in that:

(1). the corresponding relation of imperforation bone ring thickness (d1), O type cushion rubber diameter of section (d2), end cap diameter of bore (D1), cylinder barrel diameter of bore (D2), the seal groove degree of depth (H) and width (B) is as follows, and unit uses millimeter,

(1). O type cushion rubber is selected GB GB1235-76 for use,

d1 d2 D1 D2 H B

1 3.1 23～45 28～40 3.4±0.1 4±0.2

1.2 3.5 45～50 40～56 3.9±0.1 4.5±0.2

1.5 5.7 50～160 60～170 6.1±0.1 7±0.2

2 8.6 ≥160 ≥170 8.9±0.1 11±0.3

(2). O type cushion rubber is selected GB GB3452.1-82 for use,

d1 d2 D1 D2 H B

1.2 3.55 23～50 28～56 3.94±0.1 4.5±0.2

1.5 5.3 50～140 60～150 5.70±0.1 6.8±0.2

2 7 ≥140 ≥150 7.60±0.1 9±0.3

(2). imperforation slip ring (2) is made by the teflon of filling 8～12% carbon fibers.

2. combined sealing ring with no-opener sliding ring as claimed in claim 1 is characterized in that: imperforation slip ring (2) is made by the teflon of filling 10% carbon fiber.

3. combined sealing ring with no-opener sliding ring as claimed in claim 1 or 2 is characterized in that: imperforation slip ring (2) surface finishment is not less than 6.