CN213574924U - Static sealing structure of guide sleeve of hydraulic cylinder of excavator - Google Patents
Static sealing structure of guide sleeve of hydraulic cylinder of excavator Download PDFInfo
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- CN213574924U CN213574924U CN202022410535.XU CN202022410535U CN213574924U CN 213574924 U CN213574924 U CN 213574924U CN 202022410535 U CN202022410535 U CN 202022410535U CN 213574924 U CN213574924 U CN 213574924U
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Abstract
The utility model discloses a static seal structure of excavator pneumatic cylinder uide bushing belongs to pneumatic cylinder technical field. A groove is formed outside the guide sleeve, and the sealing element is arranged in the groove of the guide sleeve; two retainer rings are also arranged in the guide sleeve groove, and the retainer rings are respectively arranged at two sides of the sealing element; the back pressure side of the guide sleeve groove is matched with a small clearance e1, and the opposite pressure side of the guide sleeve groove is matched with a large clearance e 2. The inner end of the guide sleeve is provided with a throttling hole and a buffering annular throttling area; a pressure relief groove I and a pressure relief groove II are formed in the end face of the guide sleeve; the pressure relief groove I is communicated with the throttling hole throttling area, and the pressure relief groove II is communicated with the buffering annular throttling area. The two sides of the static seal adopt radial large and small fit gaps and a double-ring check ring structure, so that the extrusion resistance of a sealing system is improved, and the problem of extrusion resistance of a sealing element in a negative pressure state is solved; the hydraulic cylinder rod cavity adopts the composite design of orifice throttling and buffer sleeve ring throttling, and two pressure relief grooves are symmetrically formed in the end face of the guide sleeve, so that the high pressure resistance of the sealing element is improved.
Description
Technical Field
The utility model relates to a pneumatic cylinder technical field specifically is a static seal structure of excavator pneumatic cylinder uide bushing.
Background
The existing hydraulic cylinder special for the excavator is provided with a buffer structure in a rod cavity, when the cylinder works and enters the buffer area, a high-pressure area is established, the static seal of a guide sleeve is easy to extrude under frequent high-pressure impact, the working condition is generally adapted by reducing the seal fit clearance, but the requirements on the machining size, the shape and the position tolerance of the fit surface are higher; when the excavator frequently operates fast, two sealing damage hidden dangers exist, on one hand, the sealing area forms high-pressure trapped oil, on the other hand, when the piston rod is recovered and moves fast, the oil is not enough supplemented in the rod cavity, the vacuum state is easily formed in the rod cavity, the static sealing reverse suction is caused, and the sealing ring is extruded from the outer side to the inner side of the guide sleeve.
The Chinese patent discloses a static sealing structure of a hydraulic cylinder and the hydraulic cylinder (CN 202441888U), which comprises a cylinder body and a guide sleeve arranged in the cylinder body, wherein a first sealing groove and a second sealing groove are arranged on the outer wall surface of the guide sleeve and/or the inner wall surface of the cylinder body, the distance from the first sealing groove to the inner side of the guide sleeve is less than the distance from the second sealing groove to the inner side of the guide sleeve, a first sealing element is arranged in the first sealing groove and comprises a sliding ring and an elastic sealing ring, and the sliding ring is sleeved outside the elastic sealing ring. The technical scheme can effectively prevent the leakage problem of the high-pressure medium of the rod cavity of the hydraulic cylinder under the severe working conditions of high pressure, unbalance loading, impact and the like.
The defects of the prior art are as follows: the sealing element is added on the traditional cylinder cover static sealing structure, the size of the sealing element is large, a large installation space is needed, and meanwhile, the manufacturing cost and the assembly difficulty are correspondingly increased.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a static seal structure of excavator pneumatic cylinder uide bushing.
The utility model discloses a following technical scheme realizes: a static sealing structure of a guide sleeve of a hydraulic cylinder of an excavator comprises a guide sleeve fixed at the end of a cylinder barrel, and a sealing element is arranged between the guide sleeve and the cylinder barrel; a groove is formed in the position, opposite to the cylinder barrel in the radial direction, outside the guide sleeve, and the sealing element is installed in the groove of the guide sleeve; two retainer rings are also arranged in the guide sleeve groove and are respectively arranged at two sides of the sealing element; the back pressure side of the guide sleeve groove is matched with the cylinder barrel through a small clearance e1, and the guide sleeve groove right faces the pressure side and is matched with the cylinder barrel through a large clearance e 2.
It further comprises the following steps: a throttling hole is formed in the inner end of the guide sleeve, and a buffering annular throttling area matched with the buffering sleeve is formed in the inner wall of the inner end of the guide sleeve; the end face of the guide sleeve is provided with a pressure relief groove I and a pressure relief groove II; the pressure relief groove I is communicated with the guide sleeve groove to face the pressure side and the throttling hole throttling area, and the pressure relief groove II is communicated with the guide sleeve groove to face the pressure side and the buffering annular throttling area.
The pressure relief groove I and the pressure relief groove II are symmetrical along the axis of the guide sleeve.
The two check rings have the same size and specification.
Compared with the prior art, the beneficial effects of the utility model are that:
the sealing device comprises a static seal, a sealing system and a sealing ring, wherein 1, two sides of the static seal adopt radial large and small fit clearances and a double-ring type retainer ring structure, and through the design of the double-retainer ring structure, the fit clearance of the sealing element is reduced, the extrusion resistance of the sealing system is improved, the extrusion resistance problem of the sealing element in a negative pressure state is solved, and the use reliability of the sealing element is obviously improved through the optimization of a simple structure;
2, the hydraulic cylinder has the pole chamber to adopt orifice throttle and the compound design of cushion collar ring-shaped throttle, and the uide bushing terminal surface symmetry is opened two pressure release grooves, and buffer collar ring-shaped throttle region is connected to one pressure release groove, and orifice throttle region is connected to another, through the pressure release groove design, makes the sealing member obtain improving in the aspect of anti high pressure.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view at A in FIG. 1;
FIG. 3 is an enlarged view at B in FIG. 1;
in the figure: 1. a guide sleeve; 2. a cylinder barrel; 3. a buffer sleeve; 4. a piston; 5. a retainer ring; 6. a seal member; 7. a pressure relief groove I; 8. and a pressure relief groove II.
Detailed Description
The following is a specific embodiment of the present invention, which will be further described with reference to the accompanying drawings.
As shown in figures 1 to 3, the guide sleeve 1 is fixed at the end part of a cylinder barrel 2 through a screw in the static sealing structure of the guide sleeve of the hydraulic cylinder of the excavator. The position that the uide bushing 1 is outer to be radially relative with cylinder 2 has seted up the slot, and sealing member 6 installs in uide bushing 1 slot, and sealing member 6 adopts the sealing washer.
In consideration of the extrusion resistance of the sealing system, the two sides of the sealing element 6 of the embodiment radially adopt a large fit clearance fit, a small fit clearance fit and a double-ring type retainer ring structure. The two retainer rings 5 have the same size and specification, and the retainer rings 5 are respectively arranged at two sides of the sealing element 6. The guide sleeve 1 is matched with the cylinder barrel 2 at the back pressure side of the groove by a small gap e1, and is matched with the retaining ring 5 at the left side to prevent high pressure from extruding out of a sealing piece. The guide sleeve 1 is matched with the cylinder barrel 2 by adopting a large gap e2 on the pressure side opposite to the groove, so that the guide assembly is easy. When the quick start-up, buffer zone flow supplement is slower, can produce the negative pressure, makes the sealing member just to the pressure side suction, has solved this problem through the retaining ring 5 design of rear side.
A piston 4 is arranged at the end of the piston rod, a buffer sleeve 3 sleeved on the piston rod is arranged on the left side of the piston 4, and a buffer annular throttling area matched with the buffer sleeve 3 is arranged on the inner wall of the inner end of the guide sleeve 1; the inner end of the guide sleeve 1 is also provided with a throttling hole. Pressure relief groove I7, pressure relief groove II 8 have been seted up to uide bushing 1 terminal surface, and pressure relief groove I7, pressure relief groove II 8 are along 1 axle center symmetry of uide bushing. The pressure relief groove I7 is communicated with the groove of the guide sleeve 1 to be over against the pressure side and the throttling hole throttling area, and the pressure relief groove II 8 is communicated with the groove of the guide sleeve 1 to be over against the pressure side and the buffering annular throttling area. By adopting the combined design of throttling hole throttling and buffer sleeve annular throttling, the problem that the static seal continuously receives the highest pressure in the buffer time period is solved, and the instantaneous pressure change of the buffer area is compensated through the two pressure relief grooves, so that the instantaneous pressure of the seal area is reduced.
Claims (4)
1. A static sealing structure of a guide sleeve of a hydraulic cylinder of an excavator comprises a guide sleeve (1) fixed at the end of a cylinder barrel (2), and a sealing element (6) is arranged between the guide sleeve (1) and the cylinder barrel (2); the method is characterized in that: a groove is formed in the position, opposite to the cylinder barrel (2) in the radial direction, outside the guide sleeve (1), and the sealing element (6) is installed in the groove of the guide sleeve (1); two check rings (5) are further mounted in the grooves of the guide sleeve (1), and the check rings (5) are respectively arranged on two sides of the sealing element (6); the guide sleeve (1) is matched with the cylinder barrel (2) through a small clearance (e 1) on the back pressure side of the groove, and the guide sleeve (1) is matched with the cylinder barrel (2) through a large clearance (e 2) on the pressure side opposite to the groove.
2. The static sealing structure of the guide sleeve of the hydraulic cylinder of the excavator according to claim 1, characterized in that: the inner end of the guide sleeve (1) is provided with a throttling hole, and the inner wall of the inner end of the guide sleeve (1) is provided with a buffering annular throttling area matched with the buffering sleeve (3); a pressure relief groove I (7) and a pressure relief groove II (8) are formed in the end face of the guide sleeve (1); the pressure relief groove I (7) is communicated with the groove of the guide sleeve (1) to be over against the pressure side and the throttling hole throttling area, and the pressure relief groove II (8) is communicated with the groove of the guide sleeve (1) to be over against the pressure side and the buffering annular throttling area.
3. The static sealing structure of the guide sleeve of the hydraulic cylinder of the excavator as claimed in claim 2, wherein: the pressure relief groove I (7) and the pressure relief groove II (8) are symmetrical along the axis of the guide sleeve (1).
4. The static sealing structure of the guide sleeve of the hydraulic cylinder of the excavator according to claim 1, characterized in that: the two check rings (5) have the same size and specification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022410535.XU CN213574924U (en) | 2020-10-27 | 2020-10-27 | Static sealing structure of guide sleeve of hydraulic cylinder of excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022410535.XU CN213574924U (en) | 2020-10-27 | 2020-10-27 | Static sealing structure of guide sleeve of hydraulic cylinder of excavator |
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| Publication Number | Publication Date |
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| CN213574924U true CN213574924U (en) | 2021-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022410535.XU Active CN213574924U (en) | 2020-10-27 | 2020-10-27 | Static sealing structure of guide sleeve of hydraulic cylinder of excavator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113932997A (en) * | 2021-10-29 | 2022-01-14 | 徐州徐工液压件有限公司 | Static seal combined test device |
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2020
- 2020-10-27 CN CN202022410535.XU patent/CN213574924U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113932997A (en) * | 2021-10-29 | 2022-01-14 | 徐州徐工液压件有限公司 | Static seal combined test device |
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