CN202203415U - Sealing unit and sealing device comprising the same - Google Patents
Sealing unit and sealing device comprising the same Download PDFInfo
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- CN202203415U CN202203415U CN2011201606330U CN201120160633U CN202203415U CN 202203415 U CN202203415 U CN 202203415U CN 2011201606330 U CN2011201606330 U CN 2011201606330U CN 201120160633 U CN201120160633 U CN 201120160633U CN 202203415 U CN202203415 U CN 202203415U
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- guiding cover
- sealing unit
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Abstract
The utility model discloses a sealing unit of a hydraulic cylinder, the sealing unit, arranged between a piston rod and the hydraulic cylinder, includes a guide sleeve and a Y-shaped sealing ring, an oil inlet is arranged on the guide sleeve corresponding to the opening of the inner cavity of the Y-shaped sealing ring, and the oil inlet is arranged between the end face of the guide sleeve and a sealing groove. The sealing assembly provided based on the Y-shaped ring solves the problems of undesirable sealing and low moving speed of the hydraulic cylinder performing frequent reciprocating motion, and reduces wearing as well as improves the sealing and compensation effects of the wearing parts. The hidden trouble of non-smooth oil way of the Y-shaped sealing ring is eliminated by arranging the oil inlet; a support ring is adopted to reduce the wearing of the inner wall of the cylinder body and to improve the sealing property and the service lifetime of the hydraulic cylinder, thereby reducing maintenance cost; by using such a sealing assembly, the service lifetime of the hydraulic balance oil cylinder of a numerical control machine tool is about 4 times (more than eight years) the service lifetime of the prior art, the maximum moving speed is increased by about 3 times compared with the prior art (when the work pressure P is lower than or equal to 32MPa, the working speed is 15m/s).
Description
Technical field
The utility model relates to the technical field of sealing technology in hydraulic machinery field, particularly hydraulic jack.
Background technique
Hydraulic jack is widely used in many heavy industry fields such as hoist, excavator, tunnel top support device, heavy moving element balance.Its performance index such as ouput force, life-span, fuel consumption etc. depend primarily on the sealing of oil cylinder, and seal arrangement is the critical component of whole hydraulic jack.
The sealing requirements of different purposes hydraulic jacks is also different, and wherein piston rod is made the hydraulic jack of type frequently reciprocating, and its seal arrangement can bear long alternate load; Easy abrasion, the typical case is like the headstock hydro-cushion oil cylinder of numerical control machine tool, when lathe is worked; The piston rod of balancing cylinder can be under headstock drives; Do frequent to-and-fro motion, make the sealing position bear certain axial force and moment, make its seal arrangement become whole hydraulic system part the most easy to wear.Practical application finds that the general life-span of seal arrangement of general numerical control machine tool hydro-cushion oil cylinder lack (about 2 years), and main failure forms is that fluid seepage, equilibrant reduce, piston rod becomes flexible etc.
The sealing of hydraulic jack generally divides two-part: the sealing between sealing between end cap and the piston rod and piston and the piston cylinder.For the hydraulic jack of making type frequently reciprocating, its sealing technique difficult point mainly is presented as:
1, reduces the impact that brings because of the piston rod type frequently reciprocating, avoid metal parts directly to contact, reduce circle (or oil cylinder inner wall) wearing and tearing in the end cap seal arrangement;
2, sealing surface is fitted closely, can adapt to the variation of oil pressure in reciprocating impact of piston rod and the oil cylinder;
3, the seal arrangement wearing and tearing of compensating cylinder moving element automatically keep good sealing property;
4, maintainable good, easy accessibility.
Fig. 1 is at present a kind of hydro-cushion cylinder seal device that typically encircles based on lattice, in Fig. 1, the sealing between end cap and the piston rod by guiding cover, 1 lattice encircle, 1 C shape dust ring, 1 O shape circle form; Sealing between piston and the piston cylinder by 1 lattice encircle, 2 support rings form.Support ring is mainly used in the direct contact of avoiding metalwork, and the O shape circle of outer shroud then is used for buffering and compensate for wear; Support ring mainly plays the motion guide effect of piston; C shape circle dust ring is mainly used in dustproof.
Under above-mentioned seal pattern; Between end cap and the piston rod and the sealing between piston and the piston cylinder is mainly encircled by lattice and O shape circle is accomplished: lattice encircle inner edge under the effect of outer shroud O shape circle elasticity pretightening force; Be adjacent to piston rod, guarantee the sealing load of rod seal face; When there was certain wear in circle in the end cap, the automatic compensate for wear of rubber-like O shape circle meeting zone guaranteed sealing effect.The motion guide of piston mainly realizes that by two support rings of piston support ring can also avoid piston to contact with the direct of cylinder body, avoids directly contacting wearing and tearing and the scuffing that causes because of metal parts.
The lattice of sealing structure encircle the outer shroud material and are generally filling PTFE (basic material is polytetrafluoroethylene and bronze powder); The filling PTFE material that is used for hydraulic parts has high compressive strength, hardness and wear resistance; Good thermal conductivity can be born very big mechanical load, working pressure and movement velocity.O shape circle is generally the fluorine rubber material of high temperature resistant (30 ℃～200 ℃), and the elastic forepressure when installing guarantees that lattice encircle with the tight of cylinder body and contact, simultaneously the wearing and tearing of circle (or inboard wall of cylinder block) in the compensation end cap automatically.
Do not having under the situation about damaging, the operation parameter and the characteristics of this sealing configuration are following:
(1) operating temperature range is-35 ℃～190 ℃;
(2) operating rate is moved≤5m/s, has lower surface friction drag, does not have the sticking phenomenon that stagnates;
(3) working pressure P≤25MPa, pressure maximum are 40MPa when 2m/s (movement velocity mouth≤);
The hydro-cushion oil cylinder of actual most of lathes is after adopting this seal arrangement; Use the situation promptly occurred seal failure in 1～2 year, the main cause analysis is following: 1, lattice come ring material hardness big, slow down inadequately for the impact of alternating force; Cause circle (or inboard wall of cylinder block) wearing and tearing in the guiding cover; 2, in the guiding cover after circle (or inboard wall of cylinder block) wearing and tearing, the combination that lattice encircle with O-ring seals can not effectively compensate the abrading section, because the interior ring material that lattice encircle has higher hardness; The resiliently deformable of outer shroud O shape circle is not enough to compensate the wearing and tearing of circle in the guiding cover, causes fluid from the fray seepage.
The sealing of Y type also is a kind of important type.Its sealing is mainly accomplished with Y shape circle, is equipped with corresponding seal groove (being positioned on guiding cover and the piston), accomplishes the sealing to hydraulic jack.Typical structure is as shown in Figure 2, and existing sealing means based on y-shaped ring is as noted above mostly, through utilizing hydraulic fluid pressure; Y shape circle inner chamber is expanded under the oil pressure effect; The outer lip limit is adjacent to sealing surface all the time in keeping, and pressure is big more, and lip cooperates tightr with sealing surface; Sealing is stronger, and Here it is " self-tightening "
Some problems often appear in the application of Y shape circle, and its main cause is:
1, because the distortion of Y shape circle makes its lip contact with guiding cover outer and causes A place (see figure 3) asphalt channel to be blocked, hydraulic oil can't flow into Y shape circle inner chamber, causes that sealing load descends;
2, (see figure 3) directly contacts with the guiding cover Y shape circle at the B place, and Y shape is enclosed in piston rod to-and-fro motion process, and a side at the back side possibly clamp-oned the gap and damage and wear by oil liquid pressure, the phenomenon that produces " back of the body is cut " or extrude.
Summary of the invention
The utility model is to above-mentioned technical problem; Design a kind of novel black box based on Y shape circle; Solve this type and make the poor sealing of type frequently reciprocating hydraulic jack, movement velocity problem of smaller, and reduce to wear and tear and improve sealing compensation effect the abrading section.
The utility model is a kind of sealing unit, is installed between piston rod and the hydraulic jack, comprises guiding cover, y-shaped ring, and the corresponding guiding cover of y-shaped ring lumen openings is provided with filler opening.
The filler opening of said sealing unit is between guiding cover end face and seal groove.
The filler opening of sealing unit can be through hole.
Further, the filler opening of sealing unit can change breach into.
At the y-shaped ring back side baffle ring is housed in the seal groove of sealing unit.
A kind of seal arrangement is installed between piston rod and the end cap, comprises guiding cover, support ring, dust ring, sealing unit, and support ring is installed on guiding cover middle part, and it is inboard that sealing unit is installed on the guiding cover, and dust ring is installed on the guiding cover outside.
A kind of seal arrangement is installed between piston rod and the hydraulic jack, comprises guiding cover, support ring, sealing unit, and support ring is installed on guiding cover middle part, and two sealing unit symmetries are installed on guiding cover both sides.
The utility model has following advantage than existing technology:
Through filler opening is set, eliminated the not smooth hidden danger of y-shaped ring oil circuit, strengthened sealing effect.
Through support ring is set, reduce the wearing and tearing of interior circle of end cap and inboard wall of cylinder block, the sealing and the working life of improving hydraulic jack, the maintenance cost of reduction hydraulic jack total life cycle.
Give full play to y-shaped ring " self-tightening "; And the movement guide effect of two support rings, the excellent sealing property of Y shape circle makes the oil cylinder pressure maximum increase, 2 of support ring are supported and employed material; Make the motion of piston rod have lower frictional force; Avoid the direct contact of metal parts simultaneously, reduced wearing and tearing, effectively improved the maximum operating speed and the pressure maximum of hydraulic jack.
Adopt the numerical control machine tool hydro-cushion oil cylinder of the utility model, the life-span increases to intrinsic about 4 times (more than 8 years), and maximum movement speed increases to intrinsic about 3 times (during working pressure P≤32MPa, 15m/s).
Description of drawings
The hydraulic cylinder sealing that Fig. 1 encircles based on lattice
The existing sealing unit of Fig. 2 based on Y shape circle
The typical failure mode of the common Y type of Fig. 3 sealing unit
Fig. 4 the utility model schematic representation
Fig. 5 guides the seal groove oil inlet hole schematic representation of cover
Schematic diagram of sealing device between Fig. 6 piston rod and the end cap
Schematic diagram of sealing device between Fig. 7 piston rod and the hydraulic jack
Among the figure, 1. support ring 2. lattice encircle 3. piston cylinders, 4. piston rods, 5. end cap 6.O shapes and enclose 7. dust rings, 8. guiding covers, 9. sealing surface 10.Y shape seal rings, 11. oil inlet holes, 12. baffle rings, 13. sealing units
Embodiment
See Fig. 4, Fig. 5; Baffle ring 12 and y-shaped ring 13 are packed in the seal groove of guiding cover 8 (or pistons); Sealing unit 13 assembled are behind the injection hydraulic oil, even the gap between y-shaped ring 10 and the guiding cover 8 is less; Hydraulic oil also can get into the y-shaped ring inner chamber through the oil inlet hole of guiding cover smoothly; Make that the outer lip limit is adjacent to inside and outside two sealing surfaces 9 in the y-shaped ring, this moment, effective sealing load at sealing surface place equaled precompression and the hydraulic fluid pressure sum that seal ring produces because of resiliently deformable: in not having during pressure, equal the resiliently deformable precompression with the contact pressure of sealing surface 9; When pressing in having, lip circle bottom will receive axial compression, and lip receives circumferential compression, and with the area of contact increase of sealing surface, contact pressure increases; When interior pressure further raise, the distribution form of contact pressure further changed with size, and lip cooperates tightr with sealing surface, and sealing is stronger, guarantees better seal property; On the other hand, the y-shaped ring material has elasticity preferably, and when circle (piston cylinder inwall) wore and tore in the end cap, under the oil pressure effect, the distortion on outer lip limit can make it effectively fill eroded area in the y-shaped ring, slows down the sealability that causes because of wearing and tearing and descends.
See Fig. 6, Fig. 7, the inboard of the guiding cover 8 between end cap 5 and piston rod 4 is provided with sealing unit 13, the middle part is provided with a support ring 1, arranged outside dust ring 7; Guiding between piston rod 4 and piston cylinder 3 overlaps that 8 bilateral symmetry are provided with sealing unit 13, the middle part is provided with a support ring 1; Realize two point locations of piston rod 4 are supported through two support rings; This supporting way makes piston rod 4 impact to end cap 5 or inboard wall of cylinder block when motion be distributed to two positions; Make that the radial impact power that each position receives significantly reduces under same impact moment effect.Simultaneously, this supporting way has effectively strengthened the leading role of piston rod movement, has reduced the wearing and tearing of interior circle of end cap and inboard wall of cylinder block.In addition, support ring can also play the effect of secondary seal, final sealing and working life of effectively improving hydraulic jack.
The y-shaped ring the selection of material is a urethane rubber; The support ring the selection of material is the PTFE+ bronze, and the baffle ring the selection of material is a nylon.
The utility model is given full play to y-shaped ring " self-tightening "; And the movement guide effect of two support rings; The excellent sealing property of y-shaped ring makes the oil cylinder pressure maximum increase; 2 of support ring support and select suitable material for use, make the motion of piston rod have lower frictional force, have avoided the direct contact of metal parts simultaneously.Both combine, and have effectively improved the maximum operating speed and the pressure maximum of hydraulic jack.
Claims (6)
1. a sealing unit is installed between piston rod and the hydraulic jack, comprises guiding cover, y-shaped ring, it is characterized in that, the corresponding guiding cover (8) of y-shaped ring (10) lumen openings is provided with filler opening.
2. sealing unit according to claim 1 is characterized in that, described filler opening is oil inlet hole (11).
3. sealing unit according to claim 1 is characterized in that, described filler opening is a breach.
4. according to the described sealing unit of one of claim 1 to 3, it is characterized in that baffle ring (12) is equipped with at y-shaped ring in seal groove (10) back side.
5. seal arrangement that is installed between piston rod and the end cap; Comprise one of guiding cover, support ring, dust ring, claim 1 to 4 described sealing unit (13); It is characterized in that; Support ring (1) is installed on guiding cover (8) middle part, and sealing unit (13) is installed on guiding cover (8) inboard, and dust ring (7) is installed on guiding cover (8) outside.
6. seal arrangement that is installed between piston rod and the hydraulic jack; Comprise one of guiding cover, support ring, claim 1 to 4 described sealing unit (13); It is characterized in that support ring (1) is installed on guiding cover (8) middle part, two sealing units (13) symmetry is installed on guiding cover (8) both sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201606330U CN202203415U (en) | 2011-05-17 | 2011-05-17 | Sealing unit and sealing device comprising the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201606330U CN202203415U (en) | 2011-05-17 | 2011-05-17 | Sealing unit and sealing device comprising the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202203415U true CN202203415U (en) | 2012-04-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201606330U Expired - Lifetime CN202203415U (en) | 2011-05-17 | 2011-05-17 | Sealing unit and sealing device comprising the same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202203415U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278479A (en) * | 2011-05-17 | 2011-12-14 | 成都飞机工业（集团）有限责任公司 | Y-shaped sealing unit |
| CN102705295A (en) * | 2012-05-30 | 2012-10-03 | 马鞍山市裕华机械制造有限公司 | Guide sleeve of hydraulic oil cylinder |
| CN102996809A (en) * | 2012-12-20 | 2013-03-27 | 常熟市董浜镇徐市盛峰液压配件厂 | Y-type sealing ring |
| CN104329460A (en) * | 2014-10-24 | 2015-02-04 | 东方电气集团东方汽轮机有限公司 | Sealing structure and sealing method for faying surface of high-temperature medium pressure container |
| CN106439034A (en) * | 2016-12-09 | 2017-02-22 | 无锡银联齿轮传动机械有限公司 | Y-shaped seal ring |
| CN111702550A (en) * | 2020-07-15 | 2020-09-25 | 浙江双正科技股份有限公司 | Machine tool |
-
2011
- 2011-05-17 CN CN2011201606330U patent/CN202203415U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278479A (en) * | 2011-05-17 | 2011-12-14 | 成都飞机工业（集团）有限责任公司 | Y-shaped sealing unit |
| CN102705295A (en) * | 2012-05-30 | 2012-10-03 | 马鞍山市裕华机械制造有限公司 | Guide sleeve of hydraulic oil cylinder |
| CN102996809A (en) * | 2012-12-20 | 2013-03-27 | 常熟市董浜镇徐市盛峰液压配件厂 | Y-type sealing ring |
| CN104329460A (en) * | 2014-10-24 | 2015-02-04 | 东方电气集团东方汽轮机有限公司 | Sealing structure and sealing method for faying surface of high-temperature medium pressure container |
| CN106439034A (en) * | 2016-12-09 | 2017-02-22 | 无锡银联齿轮传动机械有限公司 | Y-shaped seal ring |
| CN111702550A (en) * | 2020-07-15 | 2020-09-25 | 浙江双正科技股份有限公司 | Machine tool |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120425 |
|
| CX01 | Expiry of patent term |