CN112145496B - Floating sleeve and hydraulic cylinder - Google Patents
Floating sleeve and hydraulic cylinder Download PDFInfo
- Publication number
- CN112145496B CN112145496B CN201910566548.5A CN201910566548A CN112145496B CN 112145496 B CN112145496 B CN 112145496B CN 201910566548 A CN201910566548 A CN 201910566548A CN 112145496 B CN112145496 B CN 112145496B
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- radial
- piston
- floating sleeve
- floating
- annular
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- 238000007789 sealing Methods 0.000 claims abstract description 13
- 230000000694 effects Effects 0.000 claims description 9
- 230000008859 change Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000010276 construction 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
- 230000008569 process Effects 0.000 description 1
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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
The application provides a floating sleeve and a hydraulic cylinder. The floating sleeve is used for sealing a piston, and comprises: an annular liner body having a first side oriented in an axial direction 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, the double-acting sealing of the piston is realized. Under this kind of arrangement, no matter from which side of pneumatic cylinder the pressure oil comes, the oil after producing certain pressure drop all can flow to its inboard that is close to the piston from the outside of floating cover through this radial through-hole, and the floating cover can be warp with pressure variation in order to realize the clearance seal, can avoid taking place simultaneously that floating cover and cylinder take place the locking under the running state of high pressure oil phenomenon.
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 this process of pressure oil transfer, a floating sleeve is usually provided on the pressure oil transfer path to assist in achieving a double-acting seal for the piston in order to ensure a seal. However, the design of the floating cover 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 cylinder, if the oil pressure during operation is too high, it is easy for the high-pressure oil to lift the end of the floating sleeve close to 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 respectively realizing unidirectional sealing, the locking phenomenon can be avoided, but the structural complexity and the cost of the hydraulic cylinder can be correspondingly increased. Therefore, how to provide a floating sleeve with simple structure and good sealing effect is a technical problem to be solved.
Disclosure of Invention
In view of this, the present invention provides a floating sleeve and hydraulic cylinder that effectively solves or alleviates one or more of the above-identified and other problems of the prior art.
To solve one of the above-mentioned technical problems, according to an aspect of the present application, there is provided a floating cover for sealing a piston, the floating cover comprising: an annular liner body having a first side oriented in an axial direction 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: a cylinder barrel, a piston, a flange cover and a floating sleeve as described above; the floating sleeve is axially arranged between the piston and the flange cover, and the first side and the second side of the floating sleeve are respectively kept sealed relative to the piston and the flange cover; and the floating sleeve is arranged between the cylinder barrel and the piston in the radial direction, and the floating sleeve is respectively provided with a gap relative to the cylinder barrel and the piston so as to allow the floating sleeve to float in the radial direction.
According to the technical scheme of the application, the double-acting sealing of the piston is realized by arranging one or more radial through holes which are communicated with the inner side and the outer side of the floating sleeve arrangement body. Under this kind of arrangement, no matter from which side of pneumatic cylinder the pressure oil comes, the oil after producing certain pressure drop all can flow to its inboard that is close to the piston from the outside of floating cover through this radial through-hole, and the floating cover can be warp with pressure variation in order to realize the clearance seal, can avoid taking place simultaneously that floating cover and cylinder take place the locking under the running state of high pressure oil phenomenon.
Drawings
The present application will be more fully understood from the following detailed description of the specific embodiments, taken in conjunction with the accompanying drawings, in which like reference numerals refer to like elements in the drawings. 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 of a hydraulic cylinder being subjected to pressure oil from a first side; and
Fig. 3 shows a schematic view of an embodiment of the hydraulic cylinder being subjected to pressure oil from the second side.
Detailed Description
Referring now to fig. 1-3 in combination, an embodiment of a floating collar is provided. The floating cover 100 is generally fitted over the piston 220 of a double-acting hydraulic cylinder and is used to provide a seal between the cylinder 210 and the piston 220. The floating cover 100 includes an annular bushing body 110. In the present application, for convenience of description of the structure and positional relationship, the orientation of the floating cover body 110 is oriented along the following coordinates. That is, the floating collar body 110 has a first side 110a oriented in the axial direction X and an opposite second side 110b; and 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 on the annular bushing body 110, and the radial through holes 120 communicate the outer side 110d and the inner side 110c of the annular bushing body 110 in the radial direction Y. This arrangement can achieve a double-acting seal against the piston. In addition, no matter which side of the hydraulic cylinder the pressure oil comes from, the oil with certain pressure drop can flow from the outer side of the floating sleeve to the inner side of the floating sleeve, which is close to the piston, through the radial through hole, the floating sleeve can deform along with the pressure change to realize gap sealing, and the phenomenon that the floating sleeve and the cylinder barrel are locked in the running state of high-pressure oil is avoided through a simple structural design.
On the basis of the above-mentioned embodiments, several modifications can be made to the various parts or the connection position relationships thereof on the floating sleeve to achieve other technical effects, as will be exemplified 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 uniformly arranged on the annular bushing body 110 in the circumferential direction. Since there is an annular contact space between the cylinder 210 and the piston 220 in the circumferential direction, this arrangement of the radial through holes 120 can better achieve adjustment of the oil pressure in the entire circumferential direction, i.e., the annular bushing body can make radial compensation in real time with the offset 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. In this case, 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 high-pressure oil flows in from the inside, but only a small pressure compensation when high-pressure oil flows in from the opposite side. Therefore, if the radial through hole 120 is provided at the intermediate position, various inflow modes of high-pressure oil can be effectively considered, and the sealing effect in different situations can be balanced.
As another example, for the self-construction of the radial through-hole 120, it may be provided to include a through-hole middle 121 and two through-hole ends 122, 123. Wherein the two through-hole ends 122, 123 each have an oil guiding section for guiding pressure oil into or out of the through-hole middle 121. This arrangement can better improve the flow of the pressure oil between the cylinder, the piston gap and the radial through hole, reducing the flow resistance thereof. More specifically, as shown in fig. 1, in this example, the oil guiding section is configured as a tapered section, and the tapered section diverges 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 stepped section, in which case the stepped section should have a larger diameter than the through-hole middle portion 121, and any of the foregoing specific examples may have an effect of improving the pressure oil flow resistance.
Also, for example, the radial through holes 120 may be configured to have a diameter of 4mm-6mm, thereby achieving a better pressure drop adjustment and sealing effect. If this radial through hole is further reduced, it is difficult to perform a reasonable adjustment, whereas if it is further enlarged, the peripheral pressure drop is easily affected, resulting in uncontrollable adjustment.
Other improvements can be made to the floating sleeve body in addition to the radial through holes to achieve better technical effects. For example, the first side 110a and the second side 110b of the annular liner body 110 may be provided with annular seal grooves 130, the annular seal grooves 130 for receiving an annular seal to effect a seal of the floating sleeve 100 in the radial direction Y. For another example, one or more annular equalizing grooves 140 may be provided on the outer side 110d of the annular bushing body 110 to achieve the oil equalizing effect.
Furthermore, an exemplary embodiment of a hydraulic cylinder is described further herein in connection with fig. 1. The hydraulic cylinder 200 includes: the cylinder 210, the piston 220, the flange cover 230, and the floating cover 100 of any of the foregoing embodiments or combinations thereof. Wherein the floating collar 100 is disposed between the piston 220 and the flange cover 230 along the axial direction X such that the first side 110a and the second side 110b of the floating collar 100 remain sealed with respect to the piston 220 and the flange cover 230, respectively; and the floating sleeve 100 is disposed between the cylinder 210 and the piston 220 in the radial direction Y such that the floating sleeve 100 has a clearance with respect to the cylinder 210 and the piston 220, respectively, allowing its floating in the radial direction Y to provide radial compensation and maintain pressure drop and sealing. This arrangement can achieve a double-acting seal against the piston. In addition, no matter which side of the hydraulic cylinder the pressure oil comes from, the oil with certain pressure drop can flow from the outer side of the floating sleeve to the inner side of the floating sleeve, which is close to the piston, through the radial through hole, the floating sleeve can deform along with the pressure change to realize gap sealing, and meanwhile, the phenomenon that the floating sleeve and the cylinder barrel are locked in the running state of high-pressure oil can be avoided.
On this basis, a plurality of supporting rings 240 may be further disposed on the first side 110a and the second side 110b of the annular bushing body 110; wherein the support ring 240 of the first side 110a is disposed between the cylinder 210 and the piston 220, and the support ring 240 of the second side 110b is disposed between the cylinder 210 and the flange cover 230. Since the cylinder and the piston are usually metal parts, the existence of the supporting ring can avoid excessive wear caused by rigid contact between the two parts, thereby improving the reliability of the product and prolonging the service life of the parts.
The manner in which the floating sleeve of the double acting hydraulic cylinder of the previous embodiment functions under different operating conditions will be described below in connection with fig. 2 and 3.
Referring to fig. 2, at this time, the pressure oil flows from the second side 110b of the floating cover 100 to the first side 110a thereof, and the oil pressure between the cylinder tube 210 and the piston 220 and the flange cover 230 is continuously reduced with the flow path, wherein the pressure oil flows between the annular bushing body 110 and the piston 220 via the radial through hole 120 when the flow path reaches the middle portion of the annular bushing body 110, providing the radially outward oil pressure thereto, and the floating cover maintains the pressure balance of the inner and outer sides by the 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 uniformly applies the reverse pressure, so that the pressure difference between the inner side and the outer side of the annular bushing body 110 is not excessively high, and thus the phenomenon that the first side of the bushing 100 is excessively warped upwards to lock with the cylinder tube 210 is avoided.
Referring again to fig. 3, at this time, the pressure oil flows from the first side 110a of the floating cover 100 to the second side 110b thereof, and the oil pressure between the cylinder tube 210 and the piston 220 and the flange cover 230 is continuously reduced along the flow path, wherein the pressure oil flows between the annular bushing body 110 and the piston 220 via the radial through hole 120 when the flow path reaches the middle portion of the annular bushing body 110, providing the radially outward oil pressure thereto, and the floating cover maintains the pressure balance of the inner and outer sides by the 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 uniformly applies the reverse pressure, so that the pressure difference between the inner side and the outer side of the annular bushing body 110 is not excessively high, and thus the phenomenon that the second side of the bushing 100 is excessively warped upwards to lock with the cylinder tube 210 is also avoided.
Furthermore, it should be appreciated that while the foregoing embodiments are described with respect to a double acting hydraulic cylinder as an example, the floating sleeve is equally applicable to a single acting hydraulic cylinder and achieves similar technical results.
The above detailed description is illustrative of the present application and is not intended to be limiting. In order to describe the relative positional relationship, the present application uses relative terms such as left, right, up, down, etc., and is not limited to absolute positions. Various changes and modifications may be made to the technical solution of the present application by one of ordinary skill in the related art without departing from the scope of the present application, and thus, all equivalent technical solutions are also within the scope of the present application, which is defined by the claims.
Claims (10)
1. A floating cover (100) for sealing a piston (220) of a hydraulic cylinder (200) and being arranged axially (X) between a flange cover (230) of the hydraulic cylinder (200) and the piston (220), characterized in that the floating cover (100) comprises:
An annular bushing body (110) having a first side (110 a) oriented along an axial direction (X) and an opposite second side (110 b), the first side (110 a) and the second side (110 b) respectively maintaining a seal with the flange cover (230) with respect to the piston (220) after the floating sleeve (100) is mounted in place;
An inner side (110 c) and an outer side (110 d) oriented in a radial direction (Y);
wherein, set up one or more radial through-holes (120) on annular bush body (110), radial through-hole (120) are along radial (Y) intercommunication outside (110 d) and inboard (110 c) of annular bush body (110).
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 uniformly arranged on the annular bushing body (110) in a circumferential direction.
3. The floating sleeve (100) according to claim 1, wherein the radial through hole (120) is provided axially (X) in the middle of the annular bushing body (110).
4. The floating sleeve (100) of claim 1, wherein the radial through hole (120) comprises a through hole middle portion (121) and two through hole end portions (122, 123); the two bore ends (122, 123) have oil guiding sections for guiding pressure oil into or out of the bore middle (121).
5. The floating sleeve (100) of claim 4, wherein the oil guiding section is configured as a tapered section that tapers in a direction away from the radial through hole (120); or the oil guiding section is configured as a stepped section having a larger diameter than the through hole middle (121).
6. The floating sleeve (100) of claim 1, wherein the radial through hole (120) has a diameter of 4mm-6 mm.
7. The floating sleeve (100) according to any one of claims 1 to 6, wherein the first side (110 a) and the second side (110 b) of the annular bushing body (110) have annular seal grooves (130), the annular seal grooves (130) being used for mounting an annular seal to effect a seal of the floating sleeve (100) in a 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 (110 d) of the annular bushing body (110).
9. A hydraulic cylinder (200), characterized by comprising: -a cylinder (210), a piston (220), a flange cover (230), a floating cover (100) according to any one of claims 1 to 8; wherein the floating sleeve (100) is arranged between the piston (220) and the flange cover (230) along the axial direction (X), and a first side (110 a) and a second side (110 b) of the floating sleeve (100) are respectively kept sealed relative to the piston (220) and the flange cover (230); 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 a clearance relative to the cylinder (210) and the piston (220) respectively, so as to allow the floating sleeve to float along the radial direction (Y).
10. The hydraulic cylinder (200) according to claim 9, further comprising: a plurality of support rings (240) disposed on a first side (110 a) and a second side (110 b) of the annular bushing body (110); wherein the support ring (240) of the first side (110 a) is arranged between the cylinder (210) and the piston (220), and the support ring (240) of the second side (110 b) is arranged between the cylinder (210) and the flange cover (230).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910566548.5A CN112145496B (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 CN112145496B (en) | 2019-06-27 | 2019-06-27 | Floating sleeve and hydraulic cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112145496A CN112145496A (en) | 2020-12-29 |
| CN112145496B true CN112145496B (en) | 2024-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910566548.5A Active CN112145496B (en) | 2019-06-27 | 2019-06-27 | Floating sleeve and hydraulic cylinder |
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| Country | Link |
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Citations (2)
| 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 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105465105B (en) * | 2016-01-18 | 2017-06-09 | 天津市四方欧业液压技术有限公司 | A kind of floating mechanical sealing high speed rotary distributor |
| 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/CN112145496B/en active Active
Patent Citations (2)
| 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 |
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| Publication number | Publication date |
|---|---|
| CN112145496A (en) | 2020-12-29 |
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