CN1114396A - Hydraulically autocontrolled oil cylinder with two-stage dynamic seal - Google Patents
Hydraulically autocontrolled oil cylinder with two-stage dynamic seal Download PDFInfo
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- CN1114396A CN1114396A CN 94111816 CN94111816A CN1114396A CN 1114396 A CN1114396 A CN 1114396A CN 94111816 CN94111816 CN 94111816 CN 94111816 A CN94111816 A CN 94111816A CN 1114396 A CN1114396 A CN 1114396A
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Abstract
The dynamically sealed oil cylinder composed of cylinder body, piston and guide shell features that hydraulically autocontrolled dynamic seal unit with interference elasticity and expansion-type dynamic seal unit are installed to piston and guide shell. The higher the hydraulic force, the higher the positive pressure on working plane, the better its sealing, and the higher its bearing capacity. It has stable pressure and long service life.
Description
The present invention relates to a kind of hydraulically autocontrolled oil cylinder with two-stage dynamic seal and belong to the hydraulic transmission field, this device comprises piston, cylinder body, piston rod and guide sleeve, piston and guide sleeve are provided with the secondary dynamic seal apparatus of interference elastic sealing device and metal expander formula seal arrangement, make the increase of hydraulic coupling in the cylinder come automatic control motive sealing stepped starting.This device has that hydraulic pressure is big more, and the positive pressure of motive sealing applying working surface is big more, the feature that sealing effect is good more.
Existing oil cylinder all is an intensity of utilizing sealing material self, and the processing quality of fit of elasticity and element goes leak stopping, but because of the unique characteristics of material, good springiness, intensity is not high, the elasticity that intensity is high is bad, and element, processing, cooperation, precision are high more, and it is difficult more to process.Piston and cylinder body quality of fit are high, and the gap is little, form the air pocket sealing, because the seal leak both sides form high-voltage oil cavity, the elasticity motive sealing is compressed, and hydraulic coupling is big more, and the elasticity motive sealing is compressed, and sealability is poor more.Therefore, the working pressure of oil cylinder is paced up and down at 30MPa always, improve the bearing capacity of oil cylinder, can only increase piston area, has caused equipment big and heavy.Edit by Lei Tianjue, what China China Machine Press published April nineteen ninety " has introduced reciprocating type motive sealing of ultrahigh pressure and static seal for the 1861st～1862 in the oilhydraulic engineering handbook, because sealing is still by the principle design of blocking up " leakage ", thereby this device exists machining accuracy high, starting resistance is big, piston stroke is short, and power is low, can only be used for instrument, instrument.
The present invention is directed to above-mentioned oil cylinder deficiency, provide a kind of quality of fit low, working pressure is at 40MPa to 150MPa, and working pressure is stable, and bearing capacity is big, uses flexibly the hydraulically autocontrolled oil cylinder with two-stage dynamic seal of long service life.
The object of the present invention is achieved like this: this oil cylinder comprises cylinder body (1), end cap (30) piston rod (26) filler opening (2), (17), piston (9).
A, cylinder body (1) one end and end cap are interference socket (33) for another section of long scyewed joint (34) for (30) one sections, between interference socket (33) and long scyewed joint (34), a step is arranged, the step place is equipped with sealing material (31), cylinder body (1) is that the chamfering welding connects (32) with end cap (30) seam crossing, constitutes multistage static seal;
B, cylinder body (1) one end and guide sleeve are that another section of long scyewed joint (49) is interference socket (54) for (48) one sections, between interference socket (54) and scyewed joint (49) step are arranged.The step place is equipped with sealing material (52).Cylinder body (1) is that the chamfering welding connects (57) with guide sleeve (48) seam crossing, constitutes multistage static seal;
C, piston (9) one ends and piston rod (26) socket place have a step (14), be equipped with sealing material (56) on the step (14), piston (9) the other end has one to claim cover (3), a nut (25) and a title cover (3), piston (9), piston rod (26) combines as a whole, prop up the oil duct (24) that claims that an annular oil cavity (35) is respectively arranged on cover (3) two ends and be communicated with oil pocket (36), prop up and claim middle part, the outer garden of cover (3) to be provided with groove, be provided with one in the groove and claim ring (4), the outer garden of piston (9) is provided with two annular oil cavities (40), (42), oil pocket (40), (42) go up sealed attachment metal expander formula seal arrangement (8) is arranged, constitute two seal oil chambers (40), (42), unloading one-way valve (5) on piston (9) one ends is by oil duct (7), throttle valve (37) communicates with oil pocket (40) respectively by oil duct (39), unloading one-way valve (13) on piston (9) the other end is by oil duct (11), throttle valve (45) communicates with oil pocket (42) respectively by oil duct (43), constitute forward and reverse hydraulic coupling automatic control metal expander formula motive sealing (8), (10), step place, piston (9) two ends is provided with by O RunddichtringO (38), (44) and L RunddichtringO (6), (12) combination, constitute forward and reverse hydraulic coupling automatic control interference elasticity motive sealing (6), (12), its L RunddichtringO (6), (12) opening is towards piston (9) two ends;
D, guide sleeve (48) are established three grooves in the hole, the left side groove is established a title ring (19), middle groove is by O RunddichtringO (50) and reverse L RunddichtringO (20) combination, guide sleeve (48) left end oil duct (58) (Fig. 4 provides) communicates with sealing group (20), constitutes hydraulic coupling automatic control interference elasticity motive sealing (20); Right side groove (53) is gone up sealed attachment metal o-ring (22), forms oil closed cavity (53); Guide sleeve (48) left end unloading one-way valve (16) is through oil duct (21), and throttle valve (47) communicates with oil pocket (53) respectively through oil duct (51), constitutes hydraulic coupling automatic control metal expander formula motive sealing (22); Guide sleeve (48) left end is established dashpot check valve (18), buffering oil pocket (46), and dashpot check valve (18) communicates with buffering oil pocket (46) through oil duct (55), and piston (9) right-hand member step (14) cooperates with buffering oil pocket (46), constitutes the forward damping device;
The right side of e, cylinder body (1) left end cylinder cap (30) is established buffering oil pocket (29) and is cooperated with the outer garden of piston rod (26) left end; Piston rod (26) left end is established dashpot check valve (28), communicates with main oil gallery (2) through oil duct (27), (35), constitutes reverse damping device.
Described oil cylinder is characterized in that, described throttle valve (45), (37) and unloading one-way valve (13), (5) are symmetric arrays, and two symmetrical line angles are 60 °.
Described oil cylinder is characterized in that the mutual angle of unloading one-way valve (16), throttle valve (47), oil duct (58) of guide sleeve (48) one ends is 60 °.
Described oil cylinder is characterized in that described end cap (30) can be guide sleeve (48).
Further specify the present invention below in conjunction with accompanying drawing
Fig. 1 is the section of structure of the embodiment of the invention.
Fig. 2 is piston two ends throttle valve, unloading one-way valve key plan
Fig. 3 is the key plan of guide sleeve, unloading one-way valve, throttle valve, dashpot check valve
Fig. 4 changes the sectional view of guide sleeve into for embodiment of the invention cylinder cap
Among Fig. 1: 1. cylinder body, 2.17 main hydraulic fluid ports 3. claim cover, 4.19 claim ring, 5. 13,16 unloading one-way valves, 6.12,20 interference elasticity dynamic seal rings, 7.11,15,21,24,27,35,39,43,51,55,58 oil ducts, 8.10,22 metal expander formula dynamic seal ring, 9. pistons, 14. step, 18.28, dashpot check valve, 23, dust ring, 25. nut, 26. piston rods, 29.46 buffering oil pockets, 30. cylinder cap, 31.52,56 sealing materials, 32.57 welding connect, 33,54 interference sockets, 34.49 long scyewed joint, 36.40.42.53 oil pocket, 37.45.47 throttle valve, " 38.41.44.50 O " RunddichtringO, 48 guide sleeves
Among Fig. 2,1. cylinder body, 2. main hydraulic fluid port, 5.13 unloading one-way valves, 9 pistons, 12. interference elasticity dynamic seal rings, 14. steps, 26. piston rods, 37.45, throttle valve, 44. " O " RunddichtringO
Among Fig. 3,1. cylinder body, 2.17 main hydraulic fluid ports, 16. unloading one-way valves, 18. dashpot check valves, 26. piston rods, 46. buffering oil pockets, 47. throttle valve, 48. guide sleeves, 55.58,15 oil ducts
Among Fig. 4,1. cylinder body, 2. main hydraulic fluid port, 18. dashpot check valves, 19. a title ring, 20 interference elasticity dynamic seal rings, 22. metal expander formula dynamic seal rings, 23. dust ring, 25. nuts, 26. piston rods, 46. the buffering oil pocket, 48. guide sleeves, 49. long scyewed joint, " 50. O " RunddichtringO, 52. sealing materials, 53.46 oil pockets, 54. the interference socket, the 55.58.15 oil duct, 57 welding connect
In conjunction with Fig. 1, Fig. 2, Fig. 3, Fig. 4 the working procedure of present embodiment is described, when static: piston (9) two ends interference elasticity motive sealing (6), (12) unloading step-down, sealing (6), (12) friction factor is little, resistance is little; The metal expander formula dynamic seal ring (8) in the outer garden of piston (9) is through unloading one-way valve (5), metal expander formula motive sealing (10) is through unloading one-way valve (13) unloading step-down, motive sealing (8), (10) and cylinder body (1) working surface keep 0.05 to 0.1mm gap, piston (9) and piston rod (26) are by the forward and reverse slippage sensitivity of deadweight, and starting resistance is little.
Piston (9) when motion: piston (9) left end boost (being lower than 40MPa), left end hydraulic coupling automatic control interference elasticity motive sealing (6) is risen outside under action of hydraulic force, hydraulic coupling is big more, and the positive pressure of motive sealing (6) applying cylinder body (1) working surface is big more, and sealability is good more; Piston (9) left end throttle valve (37) does not start, and metal expander formula dynamic seal ring (8) keeps the gap; Piston (9) right-hand member unloading step-down is in static state, the forward flexible operation.Reversing motion principle, working condition are identical with forward.
Piston (9) when motion heavy duty: when piston (9) left end boosts when reaching 40MPa, throttle valve (37) starts, 40MPa hydraulic oil enters oil pocket (40) by stream joint valve (37) through oil duct (39), and hydraulic coupling is big more, the positive pressure of expander formula motive sealing (8) applying cylinder body (1) working surface is big more, sealability is good more, and when boosting more than the 40MPa, hydraulic coupling is big more, piston (9) left end hydraulic coupling automatic control secondary motive sealing (6), (8) sealability are good more, and pressure reaches 150MPa; Piston (9) right-hand member unloading step-down is in static state, and heavily loaded positive movement is normal, increases substantially bearing capacity.Heavy duty reversing motion principle, working condition are identical with forward.The motive sealing of hydraulic coupling automatic control secondary can reach 80MPa and 150MPa respectively by independent or compound working pressure.
Piston (9) positive movement is near terminal, and piston (9) right-hand member step (14) blocking buffering oil pocket (46) forms high pressure, through oil duct (55), dashpot check valve (18) (resistance is big) unloading step-down.In the time of oppositely, main hydraulic fluid port (17) boosts through the straight push piston (9) of oil duct (15), simultaneously through dashpot check valve (18), oil duct (55), enters buffering oil pocket (46), straight push piston (9).Piston (9) inverted running is near terminal, the outer garden blocking of piston rod (26) left end buffering oil pocket (29), form high pressure, through dashpot check valve (28) (resistance is big), oil duct (27), (35) unloading step-down, in the time of oppositely, main oil gallery (2) the straight push piston (9) of boosting, main oil gallery (2) is simultaneously through oil duct (35), (27), dashpot check valve (28) enters buffering oil pocket (29), straight push piston bar (26).
Prop up sliding fit between the outer garden that claims ring (4) and cylinder body (1) working surface in piston (9) left end setting; garden and piston rod (26) sliding fit in the title ring (19) is set in guide sleeve (48) hole; common protection piston (9), the cylinder body (1) of rising; piston rod (26); guide sleeve (48) and forward and reverse hydraulic coupling automatic control secondary motive sealing (6), (8), (10), (12), (20), (22) and forward and reverse damping device have prolonged working life.
The present invention is in cylinder body and end cap and the long thread connection of fairlead employing and mistake The socket mode that is full of increases its static sealing effect; Be provided with at piston and fairlead It is moving close to prop up the movable sealing of interference elasticity and the metal tyre expansion that claim ring and hydraulic self-control Envelope and buffer unit. Therefore, this oil cylinder has long service life, and operating pressure is steady Fixed, bearing capacity is big, uses flexibly, is easy to the advantages such as processing.
Claims (4)
1, a kind of hydraulically autocontrolled oil cylinder with two-stage dynamic seal comprises cylinder cap (30) piston rod (26), and cylinder body (1), main hydraulic fluid port (2), (17), piston (9) is characterized in that:
A, cylinder body (1) one end are interference socket (33) for long (34) another section that is threaded for (30) one sections with end cap, between interference socket (83) and long scyewed joint (34), a step is arranged, the step place is equipped with sealing material (31), cylinder body (1) is that the chamfering welding connects (32) with end cap (30) seam crossing, constitutes multistage static seal;
B, cylinder body (1) one end and guide sleeve are that another section of long scyewed joint (49) is interference socket (54) for (48) one sections, between interference socket (54) and long scyewed joint (49) step are arranged.The step place is provided with sealing material (52).Cylinder body (1) is that the chamfering welding connects (57) with guide sleeve (48) seam crossing, constitutes multistage static seal;
C, piston (9) one ends and piston rod (26) socket place have a step (14), be equipped with sealing material (56) on the step (14), piston (9) the other end has one to claim cover (3), a nut (25) and a title cover (3), piston (9), piston rod (26) is connected as a single entity, prop up the oil duct (24) that claims that an annular oil cavity (36) is respectively arranged on cover (3) two ends and be communicated with oil pocket (36), prop up and claim middle part, the outer garden of cover (3) to be provided with groove, be provided with one in the groove and claim ring (4), the outer garden of piston (9) boss is provided with two annular oil cavities (40), (42), oil pocket (40), (42) go up sealed attachment metal expander formula seal arrangement (8) is arranged, constitute two seal oil chambers (40), (42), unloading one-way valve (5) on piston (9) one ends is by oil duct (7), throttle valve (37) communicates with oil pocket (40) respectively by oil duct (39), unloading one-way valve 13 on piston (9) the other end) by oil duct (11), throttle valve (45) communicates with oil pocket (42) respectively by oil duct (43), constitute forward and reverse hydraulic coupling automatic control metal expander formula motive sealing (8), (10), step place, piston (9) two ends is provided with by O RunddichtringO (38), (44) and L RunddichtringO (6), (12) constitute forward and reverse hydraulic coupling automatic control interference elasticity motive sealing (6), (12), its L RunddichtringO (6), (12) opening is towards piston (9) two ends.
D, guide sleeve (48) are established three grooves in the hole, the left side groove is established a title ring (19), middle groove is by O RunddichtringO (50) and reverse L RunddichtringO (20) combination, guide sleeve (48) left end oil duct (58) (Fig. 4 provides) communicates with sealing group (20), constitutes hydraulic coupling automatic control interference elasticity motive sealing (20); Right side groove (53) is gone up sealed attachment metal o-ring (22), forms oil closed cavity (53); Guide sleeve (48) left end carries valve unidirectional (16) through oil duct (21), and throttle valve (47) communicates with oil pocket (53) respectively through oil duct (51), constitutes hydraulic coupling automatic control metal expander formula motive sealing (22); Guide sleeve (48) left end is established dashpot check valve (18), buffering oil pocket (46), and dashpot check valve (18) communicates with buffering oil pocket (46) through oil duct (55), and piston (9) right-hand member step (14) cooperates with buffering oil pocket (46), constitutes the forward damping device;
The right side of e, cylinder body (1) left end cylinder cap (30) is established buffering oil pocket (29) and is cooperated with the outer garden of piston rod (26) left end; Piston rod (26) left end is established dashpot check valve (28), communicates with main hydraulic fluid port (2) through oil duct (27), (35), constitutes reverse damping device.
2, oil cylinder as claimed in claim 1 is characterized in that, described throttle valve (45), (37) and unloading one-way valve (13), (5) are symmetric arrays, and two symmetrical line angles are 60 °.
3, oil cylinder as claimed in claim 1 is characterized in that described end cap (30) can be guide sleeve (48).
4, oil cylinder as claimed in claim 1 is characterized in that the unloading one-way valve (16) of guide sleeve (48) one ends, and throttle valve (17), oil duct (58) angle each other are 60 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94111816 CN1114396A (en) | 1994-06-27 | 1994-06-27 | Hydraulically autocontrolled oil cylinder with two-stage dynamic seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94111816 CN1114396A (en) | 1994-06-27 | 1994-06-27 | Hydraulically autocontrolled oil cylinder with two-stage dynamic seal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1114396A true CN1114396A (en) | 1996-01-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94111816 Pending CN1114396A (en) | 1994-06-27 | 1994-06-27 | Hydraulically autocontrolled oil cylinder with two-stage dynamic seal |
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| Country | Link |
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| CN (1) | CN1114396A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100458185C (en) * | 2007-05-14 | 2009-02-04 | 宁波华液机器制造有限公司 | Follow-up hydraulic servo oil cylinder |
| CN100482984C (en) * | 2005-11-18 | 2009-04-29 | 上海应用技术学院 | Dynamic sealing method for high precision oil cylinder with stable low leakage |
| CN102168760A (en) * | 2011-04-12 | 2011-08-31 | 皇甫岳伟 | Sealing structure with favorable safety for piston cylinder |
| CN102297176A (en) * | 2011-04-12 | 2011-12-28 | 皇甫岳伟 | Piston jar structure |
| CN101725588B (en) * | 2009-11-10 | 2012-05-23 | 武汉科技大学 | Hydraulic cylinder with clearance sealed type deformed piston |
| WO2012113350A1 (en) * | 2011-02-25 | 2012-08-30 | Neo Mechanics Limited | Coiled felt seal(cfs) sealed piston of hydraulic cylinder |
| CN111637112A (en) * | 2020-06-12 | 2020-09-08 | 郑州磨料磨具磨削研究所有限公司 | Ultra-high pressure sealing device for piston and oil cylinder of cubic press |
-
1994
- 1994-06-27 CN CN 94111816 patent/CN1114396A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100482984C (en) * | 2005-11-18 | 2009-04-29 | 上海应用技术学院 | Dynamic sealing method for high precision oil cylinder with stable low leakage |
| CN100458185C (en) * | 2007-05-14 | 2009-02-04 | 宁波华液机器制造有限公司 | Follow-up hydraulic servo oil cylinder |
| CN101725588B (en) * | 2009-11-10 | 2012-05-23 | 武汉科技大学 | Hydraulic cylinder with clearance sealed type deformed piston |
| WO2012113350A1 (en) * | 2011-02-25 | 2012-08-30 | Neo Mechanics Limited | Coiled felt seal(cfs) sealed piston of hydraulic cylinder |
| CN102168760A (en) * | 2011-04-12 | 2011-08-31 | 皇甫岳伟 | Sealing structure with favorable safety for piston cylinder |
| CN102297176A (en) * | 2011-04-12 | 2011-12-28 | 皇甫岳伟 | Piston jar structure |
| CN102168760B (en) * | 2011-04-12 | 2015-05-13 | 皇甫岳伟 | Sealing structure with favorable safety for piston cylinder |
| CN111637112A (en) * | 2020-06-12 | 2020-09-08 | 郑州磨料磨具磨削研究所有限公司 | Ultra-high pressure sealing device for piston and oil cylinder of cubic press |
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