CN112145496A - Floating sleeve and hydraulic cylinder - Google Patents
Floating sleeve and hydraulic cylinder Download PDFInfo
- Publication number
- CN112145496A CN112145496A CN201910566548.5A CN201910566548A CN112145496A CN 112145496 A CN112145496 A CN 112145496A CN 201910566548 A CN201910566548 A CN 201910566548A CN 112145496 A CN112145496 A CN 112145496A
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- floating sleeve
- radial
- piston
- annular
- hole
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- 238000007789 sealing Methods 0.000 claims abstract description 18
- 230000000694 effects Effects 0.000 claims description 12
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
- F15B15/1452—Piston sealings
Abstract
The application provides a cover and pneumatic cylinder float. This floating cover is used for sealed piston, and it includes: an annular bushing body having an axially oriented first side and an opposite second side; radially oriented inner and outer sides; one or more radial through holes are formed in the annular bushing body, and the radial through holes are communicated with the outer side and the inner side of the annular bushing body in the radial direction. According to the technical scheme of the application, double-acting sealing of the piston is achieved. Under the arrangement, no matter which side of the hydraulic cylinder the pressure oil comes from, the oil with a certain pressure drop can flow from the outer side of the floating sleeve to the inner side of the floating sleeve close to the piston through the radial through hole, the floating sleeve can deform along with the pressure change to realize clearance sealing, and the phenomenon that the floating sleeve and the cylinder barrel are locked under the operation state of the high-pressure oil can be avoided.
Description
Technical Field
The application relates to the field of hydraulic pressure, in particular to a floating sleeve for sealing a piston in a hydraulic cylinder.
Background
Double acting hydraulic cylinders are often used as drive assemblies for power systems. It refers to a kind of hydraulic cylinder which can input pressure oil from two sides of piston. In order to ensure the sealing of the piston during the transfer of the pressure oil, a floating sleeve is usually provided in the transfer path of the pressure oil to assist the double-acting sealing. However, the design of a floating sleeve in an application incorporates a number of considerations. For example, when a single floating sleeve is applied, since the application environment is usually a high-pressure oil cylinder, if the oil pressure during operation is too high, the high-pressure oil is likely to lift the end of the floating sleeve near the downstream side to lock with the cylinder barrel, thereby affecting the normal operation of the whole system. When two floating sleeves are used for realizing unidirectional sealing respectively, the locking phenomenon can be avoided, but the structural complexity and the cost of the hydraulic cylinder are correspondingly increased. Therefore, how to provide a floating sleeve with simple structure and good sealing effect is a technical problem to be solved urgently.
Disclosure of Invention
Accordingly, the present invention is directed to a floating sleeve and hydraulic cylinder that substantially obviates or mitigates one or more of the above problems and other problems due to limitations and disadvantages of the related art.
To solve one of the above technical problems, according to an aspect of the present application, there is provided a floating sleeve for sealing a piston, the floating sleeve comprising: an annular bushing body having an axially oriented first side and an opposite second side; radially oriented inner and outer sides; one or more radial through holes are formed in the annular bushing body, and the radial through holes are communicated with the outer side and the inner side of the annular bushing body in the radial direction.
According to another aspect of the present application, there is provided a hydraulic cylinder including: the cylinder barrel, the piston, the flange cover and the floating sleeve are arranged in the cylinder barrel; wherein the floating sleeve is axially disposed between the piston and the flange cover, and first and second sides of the floating sleeve are sealed with respect to the piston and the flange cover, respectively; and the floating sleeve is arranged between the cylinder barrel and the piston along the radial direction, and the floating sleeve has gaps relative to the cylinder barrel and the piston respectively so as to allow the floating sleeve to float along the radial direction.
According to the technical scheme of this application, through set up one or more its inboard radial through-hole with the outside of intercommunication on the cover setting body that floats, realized the two effect sealings to the piston. Under the arrangement, no matter which side of the hydraulic cylinder the pressure oil comes from, the oil with a certain pressure drop can flow from the outer side of the floating sleeve to the inner side of the floating sleeve close to the piston through the radial through hole, the floating sleeve can deform along with the pressure change to realize clearance sealing, and the phenomenon that the floating sleeve and the cylinder barrel are locked under the operation state of the high-pressure oil can be avoided.
Drawings
The present application will be more fully understood from the detailed description given below with reference to the accompanying drawings, in which like reference numerals refer to like elements in the figures. Wherein:
FIG. 1 shows a schematic view of one embodiment of a floating sleeve and hydraulic cylinder;
FIG. 2 shows a schematic view of an embodiment in which the hydraulic cylinder is subjected to pressure oil from a first side; and
figure 3 shows a schematic view of an embodiment where the hydraulic cylinder is subjected to pressure oil from the second side.
Detailed Description
Referring to fig. 1 to 3, an embodiment of a floating cover is provided. The floating sleeve 100 is generally disposed over the piston 220 of the double acting hydraulic cylinder and is used to provide a seal between the cylinder 210 and the piston 220. The floating sleeve 100 includes an annular liner body 110. In the present application, for the convenience of description of the structure and position relationship, the orientation of the floating sleeve body 110 is oriented using the following coordinates. That is, the floating sleeve body 110 has a first side 110a oriented in the axial direction X and an opposite second side 110 b; and it has an inner side 110c and an outer side 110d oriented in the radial direction Y. More importantly, one or more radial through holes 120 are provided in the annular liner body 110, and the radial through holes 120 communicate the outer side 110d and the inner side 110c of the annular liner body 110 in the radial direction Y. This arrangement allows for a double acting seal to be achieved for the piston. In addition, no matter which side of the hydraulic cylinder the pressure oil comes from, the oil with a certain pressure drop can flow from the outer side of the floating sleeve to the inner side of the floating sleeve close to the piston through the radial through hole, the floating sleeve can deform along with the pressure change to realize clearance sealing, and the phenomenon that the floating sleeve and the cylinder barrel are locked under the operation state of the high-pressure oil is avoided through a simple structural design.
On the basis of the foregoing embodiments, several modifications can be made to the various parts of the floating sleeve or their connection positions to achieve other technical effects, as will be exemplarily described below
For example, when a plurality of radial through holes 120 are provided on the annular bushing body 110, the plurality of radial through holes 120 may be configured to be evenly arranged on the annular bushing body 110 in the circumferential direction. Due to the annular contact space between the cylinder 210 and the piston 220 in the circumferential direction, the arrangement of the radial through holes 120 can better adjust the oil pressure in the entire circumferential direction, i.e., the annular bushing body can instantly make radial compensation along with the deflection of the piston and the change of the oil pressure.
For another example, the radial through hole 120 may be disposed in the middle of the annular bushing body 110 in the axial direction X. For a double acting hydraulic cylinder, high pressure oil may flow in from the first or second side in the axial direction. At this time, if the radial through hole 120 is provided near a specific side of the annular bushing body 110 in the axial direction X, it is possible to provide a large pressure compensation when the high-pressure oil flows from this side, but only a small pressure compensation when the high-pressure oil flows from the opposite side. Therefore, if the radial through hole 120 is provided at the middle position, various inflow methods of high pressure oil can be effectively considered, and the sealing effect under different conditions can be balanced.
As another example, for the self-structure of the radial through hole 120, it may be configured to include a through hole middle portion 121 and two through hole end portions 122, 123. Wherein the two through- hole end portions 122, 123 each have an oil guiding section for guiding pressure oil to flow into or out of the through-hole middle portion 121. The arrangement can better improve the flow of pressure oil among the cylinder barrel, the piston clearance and the radial through hole and reduce the flow resistance of the pressure oil. More specifically, as shown in fig. 1, in this example, the oil guiding section is configured as a tapered section, and the tapered section is divergent in a direction away from the radial through hole 120. Further, although not shown in the drawings, the oil guiding section may be configured as a step section, and the step section should have a diameter larger than the through hole middle portion 121, and any of the above specific examples may have an effect of improving the flow resistance of the pressure oil.
For example, the radial through hole 120 may be configured to have a diameter of 4mm to 6mm, thereby achieving a better pressure drop adjustment and sealing effect. If the radial through hole is further reduced, it is difficult to achieve a reasonable adjustment effect, and if the radial through hole is further enlarged, the peripheral pressure drop is easily affected, so that the adjustment effect is uncontrollable.
Besides the radial through hole, other improvements can be made to the floating sleeve body to achieve better technical effects. For example, the first and second sides 110a, 110b of the annular bushing body 110 may be provided with annular seal grooves 130, the annular seal grooves 130 for receiving annular seals to effect sealing of the floating sleeve 100 in the radial direction Y. For another example, one or more annular pressure equalization grooves 140 may be formed on the outer side 110d of the annular liner body 110 to achieve an oil equalization effect.
Further, an embodiment of a hydraulic cylinder is described herein in continuation with FIG. 1. The hydraulic cylinder 200 includes: a cylinder 210, a piston 220, a flange cover 230, and a floating sleeve 100 of any of the foregoing embodiments or combinations thereof. Wherein the floating sleeve 100 is disposed between the piston 220 and the flange cover 230 in the axial direction X such that the first side 110a and the second side 110b of the floating sleeve 100 remain sealed with respect to the piston 220 and the flange cover 230, respectively; and the floating sleeve 100 is disposed radially Y between the cylinder 210 and the piston 220 such that the floating sleeve 100 has clearance relative to the cylinder 210 and the piston 220, respectively, allowing its floating in the radial Y to provide radial compensation and maintain pressure drop and sealing. This arrangement allows for a double acting seal to be achieved for the piston. In addition, no matter which side of the hydraulic cylinder the pressure oil comes from, the oil with a certain pressure drop can flow from the outer side of the floating sleeve to the inner side of the floating sleeve close to the piston through the radial through hole, the floating sleeve can deform along with the pressure change to realize clearance sealing, and meanwhile, the phenomenon that the floating sleeve and the cylinder barrel are locked in the running state of the high-pressure oil can be avoided.
On the basis, a plurality of supporting rings 240 can be arranged on the first side 110a and the second side 110b of the annular bushing body 110; wherein the bearing ring 240 of the first side 110a is arranged between the cylinder 210 and the piston 220, and the bearing ring 240 of the second side 110b is arranged between the cylinder 210 and the flange cover 230. Since the cylinder and the piston are usually made of metal, the existence of the supporting ring can avoid the two from generating rigid contact to cause excessive abrasion, thereby improving the reliability of the product and prolonging the service life of the parts.
The manner in which the double-acting hydraulic cylinder of the preceding embodiment functions in the floating sleeve in different operating situations will be described below in connection with fig. 2 and 3.
Referring to fig. 2, at this time, pressure oil flows from the second side 110b to the first side 110a of the floating sleeve 100, and the oil pressure between the cylinder 210 and the piston 220 and the flange cover 230 is continuously reduced along with a flow path, wherein the pressure oil flows between the annular bushing body 110 and the piston 220 through the radial through holes 120 when the flow path reaches the middle of the annular bushing body 110, so as to provide a radially outward oil pressure thereto, and the floating sleeve maintains pressure balance between the inner side and the outer side by radial displacement. In addition, part of the pressure oil flows into the inner side of the annular bushing body 110 through the radial through holes and applies reverse pressure uniformly, so that the pressure difference between the inner side and the outer side of the annular bushing body 110 is not too high, and the phenomenon that the first side of the bushing 100 is warped upwards excessively to be locked with the cylinder barrel 210 is avoided.
Referring to fig. 3 again, at this time, the pressure oil flows from the first side 110a to the second side 110b of the floating sleeve 100, and the oil pressure between the cylinder 210 and the piston 220 and the flange cover 230 is continuously reduced along the flow path, wherein when the flow path reaches the middle of the annular bushing body 110, the pressure oil flows between the annular bushing body 110 and the piston 220 through the radial through holes 120 to provide a radially outward oil pressure for the annular bushing body, and the floating sleeve maintains the pressure balance between the inner side and the outer side by radial displacement. In addition, part of the pressure oil flows into the inner side of the annular bushing body 110 through the radial through holes and applies reverse pressure uniformly, so that the pressure difference between the inner side and the outer side of the annular bushing body 110 is not too high, and the phenomenon that the second side of the bushing 100 is warped upwards excessively to be locked with the cylinder barrel 210 is avoided.
Furthermore, it should be understood that although the foregoing embodiments have been described with reference to double acting hydraulic cylinders as an example, the floating sleeve is equally applicable to single acting hydraulic cylinders and achieves similar technical results.
The above detailed description is merely illustrative of the present application and is not intended to be limiting. In the present application, relative terms such as left, right, up, and down are used to describe relative positional relationships, and are not intended to limit absolute positions. Various changes and modifications can be made by one skilled in the art without departing from the scope of the present application, and all equivalent technical solutions also belong to the scope of the present application, and the protection scope of the present application should be defined by the claims.
Claims (10)
1. A floating sleeve (100) for sealing a piston (220), comprising: an annular bushing body (110) having a first side (110a) oriented in an axial direction (X) and an opposite second side (110 b); an inner side (110c) and an outer side (110d) oriented in a radial direction (Y); wherein one or more radial through holes (120) are provided on the annular liner body (110), the radial through holes (120) communicating an outer side (110d) and an inner side (110c) of the annular liner body (110) in a radial direction (Y).
2. The floating sleeve (100) according to claim 1, wherein a plurality of radial through holes (120) are provided on the annular bushing body (110), the plurality of radial through holes (120) being evenly arranged circumferentially on the annular bushing body (110).
3. The floating sleeve (100) according to claim 1, wherein the radial through hole (120) is provided in the middle of the annular bushing body (110) in an axial direction (X).
4. The floating sleeve (100) according to claim 1, wherein the radial through hole (120) comprises a through hole middle (121) and two through hole end portions (122, 123); the two through-opening ends (122, 123) have oil-conducting sections for conducting pressure oil into or out of the through-opening center (121).
5. The floating sleeve (100) of claim 4, wherein the oil guiding section is configured as a conical section diverging in a direction away from the radial through hole (120); or the oil guiding section is configured as a stepped section having a diameter larger than the through hole middle portion (121).
6. The floating sleeve (100) according to claim 1, wherein the radial through hole (120) has a diameter of 4-6 mm.
7. The floating sleeve (100) according to any one of claims 1 to 6, wherein the first side (110a) and the second side (110b) of the annular bushing body (110) have an annular seal groove (130), the annular seal groove (130) being for mounting an annular seal to effect sealing of the floating sleeve (100) in the radial direction (Y).
8. The floating sleeve (100) according to any one of claims 1 to 6, wherein one or more annular pressure-equalizing grooves (140) are provided on the outer side (110d) of the annular bushing body (110).
9. A hydraulic cylinder (200), comprising: -a cylinder (210), a piston (220), a flange cover (230) and a floating sleeve (100) according to any one of claims 1 to 8; wherein the floating sleeve (100) is arranged in an axial direction (X) between the piston (220) and the flange cover (230), a first side (110a) and a second side (110b) of the floating sleeve (100) being sealed with respect to the piston (220) and the flange cover (230), respectively; and the floating sleeve (100) is arranged between the cylinder (210) and the piston (220) along the radial direction (Y), and the floating sleeve (100) has clearance relative to the cylinder (210) and the piston (220) respectively, so as to allow the floating along the radial direction (Y).
10. The hydraulic cylinder (200) of claim 9, further comprising: a plurality of support rings (240) disposed on a first side (110a) and a second side (110b) of the annular liner body (110); wherein the bearing ring (240) of the first side (110a) is arranged between the cylinder barrel (210) and the piston (220), and the bearing ring (240) of the second side (110b) is arranged between the cylinder barrel (210) and the flange cover (230).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910566548.5A CN112145496A (en) | 2019-06-27 | 2019-06-27 | Floating sleeve and hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910566548.5A CN112145496A (en) | 2019-06-27 | 2019-06-27 | Floating sleeve and hydraulic cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112145496A true CN112145496A (en) | 2020-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910566548.5A Pending CN112145496A (en) | 2019-06-27 | 2019-06-27 | Floating sleeve and hydraulic cylinder |
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| Country | Link |
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| CN (1) | CN112145496A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101285492A (en) * | 2008-05-28 | 2008-10-15 | 中冶连铸技术工程股份有限公司 | Floating guiding hydraulic cylinder |
| CN202579455U (en) * | 2012-05-16 | 2012-12-05 | 扬州市江都永坚有限公司 | Rodless cavity floating buffering structure of engineering oil cylinder |
| CN203614510U (en) * | 2013-12-17 | 2014-05-28 | 泸州市龙马潭区长江液压件有限公司 | Hydraulic buffering oil cylinder |
| CN105465105A (en) * | 2016-01-18 | 2016-04-06 | 天津市四方欧业液压技术有限公司 | High-speed rotating distributor with floating mechanical seal |
| CN208040973U (en) * | 2018-04-03 | 2018-11-02 | 江苏新界机械配件有限公司 | A kind of bearing block assembly of enhancing sealing |
-
2019
- 2019-06-27 CN CN201910566548.5A patent/CN112145496A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101285492A (en) * | 2008-05-28 | 2008-10-15 | 中冶连铸技术工程股份有限公司 | Floating guiding hydraulic cylinder |
| CN202579455U (en) * | 2012-05-16 | 2012-12-05 | 扬州市江都永坚有限公司 | Rodless cavity floating buffering structure of engineering oil cylinder |
| CN203614510U (en) * | 2013-12-17 | 2014-05-28 | 泸州市龙马潭区长江液压件有限公司 | Hydraulic buffering oil cylinder |
| CN105465105A (en) * | 2016-01-18 | 2016-04-06 | 天津市四方欧业液压技术有限公司 | High-speed rotating distributor with floating mechanical seal |
| CN208040973U (en) * | 2018-04-03 | 2018-11-02 | 江苏新界机械配件有限公司 | A kind of bearing block assembly of enhancing sealing |
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