CN109281889A - A combined sealing device for hydraulic cylinder piston and hydraulic cylinder - Google Patents
A combined sealing device for hydraulic cylinder piston and hydraulic cylinder Download PDFInfo
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- CN109281889A CN109281889A CN201811327923.2A CN201811327923A CN109281889A CN 109281889 A CN109281889 A CN 109281889A CN 201811327923 A CN201811327923 A CN 201811327923A CN 109281889 A CN109281889 A CN 109281889A
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Classifications
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- 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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- General Engineering & Computer Science (AREA)
- Sealing Devices (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The present invention discloses a kind of combination sealing arrangement and hydraulic cylinder for hydraulic cylinder piston, belongs to hydraulic cylinder technical field.The device uses Split piston, including at least two piston bodies.Wherein, there are slight radial clearances between first piston body (2) outer rim and cylinder barrel (12) inner wall, form the first clearance seal；Second piston body (6) outer rim is respectively provided with sealing element (7), the first retaining ring (5), the second retaining ring (8), forms sealing ring sealing.It is connected through a screw thread and is linked together between first piston body (2) and second piston body (6), form built-up piston.The built-up piston is integrated with a sealing ring sealing and at least one clearance seal along axial direction, forms combined sealing structure.The present invention prevents internal leakage with clearance seal using sealing ring sealing simultaneously, overcomes deficiency when sealing ring sealing and clearance seal are used alone in the prior art, and sealing effect is good, is suitable for oil liquid pressure greatly and to the demanding occasion of sealing performance.
Description
Technical field
The invention belongs to hydraulic cylinder technical fields, and in particular to a kind of combination sealing arrangement and liquid for hydraulic cylinder piston
Cylinder pressure.
Background technique
Hydraulic cylinder is execution unit important in construction machinery hydraulic system, and the quality of sealing performance directly affects hydraulic
The working performance of cylinder, even complete machine.Wherein, the sealing between hydraulic cylinder piston and inner wall of cylinder is the key that close in hydraulic cylinder
Seal ring section, it leaks the generation of this typical fault mode to hydraulic cylinder interior leakage, plays conclusive effect.Hydraulic cylinder piston and cylinder
Common sealing device and structure between cylinder mainly include the forms such as sealing ring sealing, clearance seal and piston ring packing.
" Central South University's journal " (natural science edition) the 1st phase " DAS combined seal ring sealing characteristics " one of volume 48 in 2017
Wen Zhong discloses a kind of DAS (double acting seal) combined seal ring sealing structure of engineering machinery, the structure packet
An elastic dentation sealing ring, two retaining rings and two wear rings are included, as shown in Figure 1.The sealing ring of this kind of contact seals dress
It sets, although leakage rate is few, there are the frictional force between cylinder barrel and piston greatly, generates heat the defects of more, especially higher in oil pressure
In the case of, sealing ring will receive biggish compression shock, be easy to damage, and influence functional reliability.Moreover, sealing ring is mounted on work
In the sealed groove for filling in axial middle position, piston both ends diameter dimension is all larger than internal diameter of the seal ring size, when sealing element dismounts
It need to make sealed ring deformation, inner hole that could pass through pistons end after expanding with larger external force and enter sealed groove, dismounting is inconvenient, holds
Sealing ring is easily pulled and distorted, influences seal durability and sealing performance.
In Master's thesis " hydraulic cylinder clearance seal simulation and analysis of flow field " text of Wuhan University Of Technology Yan Yong in 2011, give
Go out a kind of clearance sealing structure between inner wall of cylinder and piston, contactless, utilizes piston outer rim and inner wall of cylinder
Between slight radial clearance prevent from leaking.Moreover, having opened up rectangle, trapezoidal, triangle and their combination shape on piston
The compensating groove of formula, to prevent piston eccentric and improve sealing performance.However, this contactless clearance sealing structure, still
There are some disadvantages, for example cannot completely eliminate leakage, and there are leakage rates to be consequently increased when especially operating pressure increases
The problem of.
In short, in the prior art, above two sealing piston of hydraulic cylinder device respectively comes with some shortcomings when being used alone,
There is improved space.
Summary of the invention
The technical problem to be solved by the present invention is in order to overcome the respective of the sealing of sealing ring in the prior art and clearance seal
Deficiency provides a kind of group that hydraulic cylinder piston is conveniently used for good seal performance and reliability, sealing element disassembling, assembling and replacing
Close sealing device and hydraulic cylinder.
In order to solve the above technical problems, the present invention adopts the following technical scheme that:
In a first aspect, the present invention provides a kind of combination sealing arrangement, for close between hydraulic cylinder piston and inner wall of cylinder
Envelope.
The combination sealing arrangement for hydraulic cylinder piston, piston uses split type detachable structure, by least two
Piston body is composed.Wherein, there are slight radial clearances between the external circular surfaces of first piston and inner wall of cylinder, form first
Clearance seal；The external circular surfaces of first piston are provided with several first annular balancing slits parallel to each other；Second piston body is axial
Middle position is equipped with sealing element, and two sides have been symmetrically distributed the first retaining ring and the second retaining ring, second piston body and inner wall of cylinder
Between formed sealing ring sealing.Second piston body both ends, which are connected through a screw thread, is respectively fixed with the first supporting element and second
Support member, the first supporting element are convexly equipped with flange along axis in the one end not contacted with second piston body outward, and first piston body is with
The positioning groove matched with the flange is recessed in one end of one supporting element contact.Second supporting element not with second piston body
One end of contact is convexly equipped with flange along axis outward.It is connected through a screw thread and is linked together between first piston body and second piston body,
Form built-up piston, the built-up piston be axially fixed at that piston rod is located in cylinder barrel by locking nut and elastic washer one
End；Moreover, the built-up piston is integrated with two distinct types of sealing structure along axial simultaneously, including a sealing ring sealing and
At least one clearance seal forms combined sealing structure.
The combination sealing arrangement for hydraulic cylinder piston, first piston body are along the circumferential direction evenly equipped with stepped logical
Hole, one end of the notch cuttype through hole are equipped with the threaded connector of connection first piston body and second piston body, and the other end is set
There is the second type of tamper evidence.
The combination sealing arrangement for hydraulic cylinder piston, each first annular balancing slit longitudinal section on first piston body
Shape is semicircle, or shape required for other any one, such as arc, V-arrangement, the U-shaped of non-semicircle, and
Shape made of semicircle and V-arrangement, U-shaped, trapezoidal, rectangle are respectively combined.As a kind of preferred structure of the invention, when each first
When the vertical sectional shape of annular balancing slit is semicircle, corresponding channel radii is having a size of 0.25mm~0.5mm, depth
0.5~1mm；Spacing between each first annular balancing slit is 2mm~5mm.
As another preferred structure of the invention, hydraulic cylinder piston composition is in addition to including first piston body and the
It further include having third piston body except two piston bodies.There are small radial directions between third piston body outer round surface and inner wall of cylinder
Gap forms the second clearance seal；Third piston body outer round surface is provided with several the second annular balancing slits parallel to each other, the
Three piston bodies are recessed with the positioning groove matched with the second supporting element flange in the one end contacted with the second supporting element；Third
It is connected through a screw thread and is fixedly linked between piston body and second piston body.Moreover, the quantity of the described second annular balancing slit, vertical section
The quantity, longitudinal section shape of the first annular balancing slit of the external circular surfaces of first piston in face shape and size, with the built-up piston
Shape and size correspond to identical or not identical.In addition, third piston body is along the circumferential direction evenly equipped with notch cuttype through hole, it is described
One end of notch cuttype through hole is equipped with the threaded connector of connection second piston body and third piston body, and it is stifled that the other end is equipped with first
Plug member.
The sealing element of the combination sealing arrangement for hydraulic cylinder piston, the external circular surfaces installation of second piston uses
Elasticity dentation sealing ring used in DAS (double acting seal) combined seal ring or chevron combination sealing coil structures,
Sealing ring of hydraulic cylinder piston dynamic sealing performance requirement, such as O-ring seal etc. can also be able to satisfy using other.
Second aspect, the present invention also provides a kind of hydraulic cylinders, including being used for hydraulic cylinder described in any one of first aspect
The combination sealing arrangement of piston.
Present invention employs fabricated structure design, built-up piston including Split piston body composition and two kinds are not
The combined sealing structure of sealing structure (clearance seal and sealing ring seal) composition of same type.Compared with the background art, this hair
It is bright while preventing internal leakage using sealing ring sealing and clearance seal, there is more beneficial effect, be described below:
(1) combination sealing arrangement for being used for hydraulic cylinder piston, there are two kinds of inhomogeneities between piston and inner wall of cylinder
The sealing structure of type, including a sealing ring sealing and at least one clearance seal, are integrated with clearance seal and sealing ring sealing
Respective advantage.When the combination sealing arrangement is by first piston body and the first clearance seal and second piston body and sealing ring
When sealing composition, this preferred structure is the double sealing structure that clearance seal and sealing ring are sealed and deposited, and constitutes sealing
" dual fail-safe " can play shielding action twice to the oil liquid of leakage.Even if first of sealing that leakage oil liquid first flows through cannot
Oil liquid leakage is blocked completely, and second sealing thereafter can also play further oil liquid barrier and sealing function.In this way, energy
The internal leakage between piston two sides oil suction chamber and oil back chamber is prevented to the maximum extent, moreover it is possible to is effectively relieved when operating pressure increases
The problem of leakage rate also increases with it has better seal performance when being used alone than clearance seal or sealing ring sealing.
When the combination sealing arrangement is living by first piston body and the first clearance seal, second piston body and sealing ring sealing and third
When cock body and the second clearance seal form, this preferred structure is three had simultaneously there are two clearance seal and the sealing of a sealing ring
Resealing composite structure can play shielding action three times to the oil liquid of leakage, and sealing effect is more preferable.
(2) in the above-mentioned combination sealing arrangement preferred structure with dual-seal or triple seal structure, work as work
When pressure oil liquid first flows through clearance seal and then passes through sealing ring sealing, since clearance seal has shielding slow the oil liquid flowed through
Punching effect causes oil liquid pressure to be decayed, and makes to next proceed to flow to impact of the oil liquid to sealing element of sealing ring sealing structure, damage
Hurt declines, moreover it is possible to the fever of pressure loss of energy bring sealing element and temperature rise are reduced, especially in the higher situation of oil pressure, this
Kind decline of pressure effect can become apparent from.Therefore it is conducive to extend the sealing part works service life, improves reliability, enhancing sealing performance.
(3) combination sealing arrangement for being used for hydraulic cylinder piston, the external circular surfaces of first piston be provided with several first
Annular balancing slit can make piston radial stress more balanced, reduce tilting of the piston and frictional force and abrasion in piston motion, have
Conducive to the sealing performance for improving piston, improve dynamic response.When built-up piston structure, which further includes, third piston body, third is living
The second annular balancing slit that cock body outer round surface opens up, also plays the role of similar.
(4) combination sealing arrangement for being used for hydraulic cylinder piston, when the external circular surfaces of first piston are using semicircular
When annular pressure-equalizing groove structure, compared with the existing technology for the annular pressure-equalizing groove structure of middle rectangle, oil liquid turbulent flow, whirlpool can be reduced
Phenomenon reduces energy loss, to reduce oil liquid and its fever to the adverse effect of sealing ring.
(5) combination sealing arrangement for being used for hydraulic cylinder piston, if Composite Piston Skirt is separated, single piston
Body and the sealing structural component installed thereon can be applied individually to any sealing ring sealing or clearance seal occasion, can be used for
Part replacement of the combined sealing structure of the present invention in maintenance, realizes the maximization of its use value.
(6) on second piston body sealing element dismounting when, formerly remove second piston body one or both ends supporting element and
Under the premise of retaining ring, only smaller external force is needed internal diameter of the seal ring can be made suitably to deform, to be conveniently mounted to second piston body
Outer round surface disassembles, and pulling for sealing ring is smaller with torsional deformation, and the damage caused by sealing ring is small, is beneficial to prolong
The long sealing part works service life.
In conclusion the combination sealing arrangement for hydraulic cylinder piston that first aspect present invention provides, improvements
It is to prevent internal leakage using sealing ring sealing and clearance seal simultaneously, overcomes sealing ring sealing and gap in the prior art
Deficiency when sealing is used alone has better seal effect and reliability, longer service life, sealing element convenient for disassembly and assembly
Etc. new technical effect, particularly suitable for oil liquid pressure greatly and to the demanding occasion of sealing performance.Second aspect of the present invention is mentioned
The hydraulic cylinder of confession is provided with the hydraulic cylinder piston combination sealing arrangement of first aspect present invention offer, so that the hydraulic cylinder be made to have
All beneficial effects possessed by the hydraulic cylinder piston combination sealing arrangement that first aspect present invention provides.
Detailed description of the invention
Fig. 1 is prior art DAS (double acting seal) combined seal ring structural schematic diagram.
In Fig. 1: cylinder barrel 1, wear ring 2, retaining ring 3, elastic dentation sealing ring 4, piston 5.
Fig. 2 is that the present invention shows for the combination sealing arrangement of hydraulic cylinder piston and the first embodiment structure of hydraulic cylinder
It is intended to.
Fig. 3 is the partial enlarged view of encircled portion I in Fig. 2.
Fig. 4 is that the present invention shows for the combination sealing arrangement of hydraulic cylinder piston and second of embodiment structure of hydraulic cylinder
It is intended to.
Fig. 5 is the full sectional view of the first supporting element part of the invention.
Fig. 6 is the full sectional view of the second supporting element part of the invention.
Fig. 7 is the full sectional view of first piston body part of the present invention.
Fig. 8 is the full sectional view of third piston body part in second of embodiment of the invention.
In Fig. 2~Fig. 8: oil inlet and outlet 1, first piston body 2, groove 2A, notch cuttype through hole 2B, first annular balancing slit 3,
First supporting element 4, flange 4A, the first retaining ring 5, second piston body 6, sealing element 7, the second retaining ring 8, the second supporting element 9, flange
9A, the second annular balancing slit 10, third piston body 11, groove 11A, notch cuttype through hole 11B, cylinder barrel 12, oil inlet and outlet 13, first
O-ring seal 14, dustband 15, end cap 16, y-shaped ring 17, guide sleeve 18, piston rod 19, the first type of tamper evidence 20, the 2nd O
Type sealing ring 21, third O-ring seal 22, the 4th O-ring seal 23, the second type of tamper evidence 24, elastic washer 25, locking nut
26。
Specific embodiment
With reference to the accompanying drawings and examples to the present invention for hydraulic cylinder piston combination sealing arrangement and hydraulic cylinder make into
One step explanation.It may be noted that in the description of the present invention, the orientation or position of the instructions such as term "left", "right", "inner", "outside"
Relationship is to be merely for convenience of the description present invention based on attached drawing 2 or attached orientation or positional relationship shown in Fig. 4, rather than indicated
Or imply that signified device or element must have a particular orientation, or be constructed and operated in a specific orientation, therefore cannot
It is interpreted as limitation of the present invention.In addition, term " first ", " second ", " third " are used for description purposes only, do not indicate that or secretly
Show its relative importance.
Embodiment one
Fig. 2 shows the structural schematic diagrams of the first embodiment of the invention, and Fig. 5-Fig. 7 is the structure of Partial key part
Figure.Wherein, the built-up piston that linear reciprocating motion can be done in the hydraulic cylinder, the combination are mounted in Barrel of Hydraulic Cylinders 12
Piston uses split type detachable structure, including first piston body 2 and second piston body 6.The left and right ends of second piston body 6 are logical
It crosses threaded connection and is respectively fixed with the first supporting element 4 and the second supporting element 9.Second supporting element, 9 right end is convexly equipped with convex outward along axis
Edge 9A.First supporting element, 4 left end is convexly equipped with flange 4A along axis outward, is recessed in 2 right end of first piston body and the first supporting element 4
The positioning groove 2A that left end flange 4A is matched.After flange 4A and groove 2A carry out cooperation positioning, then it is connected through a screw thread the
One piston body 2 is linked together with second piston body 6, forms built-up piston.Fig. 3 is the partial enlarged view of above-mentioned threaded connection, figure
In threaded connector be screw.
There are slight radial clearances between 12 inner wall of outer round surface and cylinder barrel of first piston body 2, and it is close to form the first gap
Envelope.The axial middle position of second piston body 6 is equipped with sealing element 7,7 two sides of sealing element be symmetrically equipped with the first retaining ring 5 with
Second retaining ring 8, to form sealing ring sealing between 12 inner wall of second piston body 6 and cylinder barrel.In this way, in the built-up piston
On axial direction, while it being provided with two distinct types of sealing structure, the sealing ring including a contact seals and one
Contactless clearance seal forms the combined sealing structure with dual-seal.
2 outer round surface of first piston body is also provided with several first annular balancing slits 3 parallel to each other.It is first annular to press
The effect of slot 3 is to keep the radial force of piston more balanced, reduces tilting of the piston and frictional force and abrasion in piston motion, has
Conducive to the sealing performance for improving piston, improve dynamic response.The vertical sectional shape of each first annular balancing slit 3 can be semicircle
Shape, can also be with arc, V-arrangement, the U-shaped of shape required for other any one, such as non-semicircle, and semicircle and V-arrangement, U
Shape made of shape, trapezoidal, rectangle are respectively combined.When the vertical sectional shape of each first annular balancing slit 3 is semicircle, groove
Radius size is 0.25mm~0.5mm, and depth is 0.5~1mm；Spacing between each first annular balancing slit 3 be 2mm~
5mm.The study found that when using semicircular annular pressure-equalizing groove structure, compared with the existing technology in rectangle annular balancing slit
For structure, it can be reduced oil liquid turbulent flow, vortex phenomenon, reduce energy loss, reduce oil liquid fever to the adverse effect of sealing ring.
First piston body 2 is along the circumferential direction evenly equipped with notch cuttype through hole 2B, and one end of notch cuttype through hole 2B is equipped with connection
The threaded connector of first piston body 2 and second piston body 6, the other end are equipped with the second type of tamper evidence 24.The work of second type of tamper evidence 24
With being to prevent oil liquid from entering notch cuttype through hole 2B, oil liquid is avoided to corrode threaded connector, and prevents oil liquid by notch cuttype through hole
2B leaks into the gap between the first supporting element 4 and sealing element 7.
The sealing element 7 installed on second piston body 6 uses DAS (double acting seal) combined seal ring or mountain
Elasticity dentation sealing ring used in shape combination sealing coil structures or other be able to satisfy hydraulic cylinder piston dynamic sealing performance requirement
Sealing ring, such as O-ring seal etc..
In Fig. 2,19 left end of piston rod in cylinder barrel 12 is equipped with the external screw thread of connection locking nut 26, locking nut 26
The built-up piston being made of 25 axial restraint of elastic washer first piston body 2 and second piston body 6.Piston rod 19 it is another
End sequentially passes through guide sleeve 18 and cylinder barrel 12 is stretched out at the center of end cap 16.Piston rod 19 and 2 inner hole of first piston body, second piston
It is separately installed with the 4th O-ring seal 23, third O-ring seal 22 between 6 inner hole of body, prevents oil liquid from passing through piston rod and piston
Inner hole leakage.The outer rim of guide sleeve 18 is equipped with the first O-ring seals 14, and the inner hole of guide sleeve 18 is equipped with y-shaped ring 17,
To prevent oil liquid from leaking.Dustband 15 is housed between 16 inner hole of end cap and piston rod 19, extraneous dust and foreign matter can be prevented to enter
Inside cylinder barrel 12.In addition, the left and right ends of cylinder barrel 12 offer oil inlet and outlet 1 and 13 respectively, oil liquid passes through when hydraulic cylinder works
The two oil inlet and outlets pass in and out cylinder chamber.
Embodiment two
Fig. 4 shows the structural schematic diagram of second of embodiment of the invention, wherein identical with the first embodiment
Components are all made of appended drawing reference same as the first embodiment.For simplicity, hereafter second of implementation of main description
The distinctive points of mode and the first embodiment.It not only includes first piston body that built-up piston in second of embodiment, which is constituted,
2 and second piston body 6, it further include having third piston body 11 (specific structure is shown in Fig. 8).11 outer round surface of third piston body and cylinder barrel
There are slight radial clearances between 12 inner walls, form the second clearance seal；11 outer round surface of third piston body is provided with several that
This second parallel annular balancing slit 10；It is recessed in 11 left end of third piston body and matches with 9 right end flange 9A of the second supporting element
The positioning groove 11A of conjunction；It is connected through a screw thread and is fixedly linked between third piston body 11 and second piston body 6.Therefore, second
The built-up piston of embodiment in the axial direction, while being provided with three seals, including the first gap on first piston body 2
Sealing ring sealing in sealing, second piston body 6 and the second clearance seal on third piston body 11.This triple seal group
The preferred structure of conjunction, compared to the dual-seal composite structure of the first embodiment, sealing performance is more preferable.
Second O-ring seal 21 is housed between 11 inner hole of third piston body and piston rod 19.11 outer circle table of third piston body
The annular balancing slit 10 of the second of face, quantity, vertical sectional shape and size are first annular with 2 outer round surface of first piston body
Quantity, vertical sectional shape and the size of balancing slit 3 correspond to identical or not identical.For example, each second annular balancing slit 10
Vertical sectional shape can for semicircle, or shape required for other any one, such as arc, the V of non-semicircle
Shape, U-shaped, and it is semicircle be respectively combined with V-arrangement, U-shaped, trapezoidal, rectangle made of shape.For another example, when each second annular is pressed
When the vertical sectional shape of slot 10 is semicircle, for channel radii having a size of 0.25mm~0.5mm, depth is 0.5~1mm；Each second
Spacing between annular balancing slit 10 is 2mm~5mm.In addition, third piston body 11 is along the circumferential direction evenly equipped with step type
The one end through-hole 11B, notch cuttype through hole 11B is equipped with the threaded connector of connection third piston body 11 and second piston body 6, another
End is equipped with the first type of tamper evidence 20, and the effect of the first type of tamper evidence 20 is similar to the second type of tamper evidence 24 in first piston body 2, herein not
It repeats again.
The first above-mentioned embodiment and second of embodiment include that the corresponding combination for hydraulic cylinder piston is close
Seal apparatus, and it is provided with the hydraulic cylinder of the hydraulic cylinder piston combination sealing arrangement.
The course of work of embodiment of the present invention one is summarized as follows:
When pressure oil enters hydraulic cylinder rodless cavity from oil inlet and outlet 1, driving piston and piston rod are moved right, and pass through
13 oil return of oil inlet and outlet.During preventing pressure oil from leaking from rodless cavity to rod chamber, on first piston body 2 first between
Gap sealing is first of closed shield that pressure oil leakage path is truncated.Even if first of sealing can not block completely oil liquid and let out
Leakage, for flowing through the leakage oil liquid of first of sealing, the sealing ring sealing on second piston body 6 constitutes second closed shield,
Further barrier leakage.This dual sealing functions can largely inhibit between piston two sides rodless cavity and rod chamber
Oil liquid internal leakage.Therefore, even if when oil liquid pressure increases to high pressure, leakage rate is still largely effectively pressed down
System, to reduce or eliminate the phenomenon that leakage rate increases with pressure and increased.Moreover, because the first seal structures have shielding
Buffer function, can occur decline of pressure when pressure oil liquid flows through first of sealing, then remake with to the second seal structures
On sealing element, especially in the higher situation of oil pressure, this decline of pressure effect can obviously weaken oil liquid suffered by sealing element
Impact and damage reduce the fever of sealing element brought by the pressure loss of energy and temperature rise, are conducive to extend the sealing part works service life, real
Now well reliably seal.
When pressure oil enters hydraulic cylinder and pass through 1 oil return of oil inlet and outlet from oil inlet and outlet 13, piston and piston rod are to the left
Movement, the sealing ring on second piston body 6, which is sealed into, at this time prevents to seal for first of oil liquid leakage, on first piston body 2
First clearance seal is second sealing.This double sealing structure still can largely effectively inhibit a piston left side
The internal leakage of right two chambers, reduces or eliminates the phenomenon that leakage rate increases with pressure and increased.It is this well reliably to seal effect
Fruit is that single clearance seal or single sealing ring sealing institute are inaccessiable.
The course of work of embodiment of the present invention two is summarized as follows:
In second of embodiment, hydraulic cylinder piston composition in addition to have first piston body 2 and second piston body 6 it
Outside, further include having third piston body 11, be corresponding with the combined sealing structure of triple seal.Specifically, including positioned at piston shaft
Sealing ring sealing on the second piston body 6 in middle position, and it is symmetrically distributed in the first piston of sealing ring sealing two sides
The second clearance seal on the first clearance seal and third piston body 11 on body 2.When pressure oil is hydraulic from the entrance of oil inlet and outlet 1
Cylinder and when through 13 oil return of oil inlet and outlet, piston and piston rod move right, and pressure oil successively will successively flow through the first gap at this time
After sealing, sealing ring sealing, the second clearance seal this three seals, rod chamber could be leaked into from rodless cavity.Compared to first
The leakage oil liquid of the dual sealing functions of kind embodiment, second of embodiment can be less, can preferably reduce or eliminate and let out
The phenomenon that leakage quantity increases with pressure and is increased.Moreover, because the decline of pressure of the first clearance sealing structure acts on, make middle position
Sealing ring sealing structure in Oil shocking suffered by sealing element and damage reduce, reduce sealing brought by the pressure loss of energy
Part fever and temperature rise are beneficial to improve the sealing part works service life, realize reliable sealing.Because of the first clearance seal and the second gap
Sealing seal relative to middle position sealing ring it is symmetrical, when pressure oil is from the entrance hydraulic cylinder and through passing in and out of oil inlet and outlet 13
When 1 oil return of hydraulic fluid port, the case where piston and piston rod move downward, and sealing function process is moved right with piston, is similar.
Above-mentioned specific embodiment is that the description of the invention is explained, rather than is limited.Do not depart from the principle of the present invention and
In the case where spirit, the present invention can also have various changes and modifications, these changes and improvements all fall in protection scope of the present invention
Within.
Claims (9)
1. a kind of combination sealing arrangement for hydraulic cylinder piston, between hydraulic cylinder piston and cylinder barrel (12) inner wall, piston
It using split type detachable structure, is composed of at least two piston bodies, wherein first piston body (2) outer round surface and cylinder
There are slight radial clearances between cylinder (12) inner wall, form the first clearance seal；First piston body (2) outer round surface is provided with several
A first annular balancing slit (3) parallel to each other；Second piston body (6) axial direction middle position is equipped with sealing element (7), two sides pair
The first retaining ring (5) and the second retaining ring (8) are distributed with claiming, form sealing ring between second piston body (6) and cylinder barrel (12) inner wall
Sealing, it is characterised in that:
1) second piston body (6) both ends, which are connected through a screw thread, is respectively fixed with the first supporting element (4) and the second supporting element (9), the
One supporting element (4) is convexly equipped with flange (4A) along axis in the one end not contacted with second piston body (6) outward, first piston body (2)
The positioning groove (2A) matched with flange (4A) is recessed in the one end contacted with the first supporting element (4)；Second supporting element
(9) flange (9A) is convexly equipped with outward along axis in the one end not contacted with second piston body (6)；
2) it is connected through a screw thread and is linked together between first piston body (2) and second piston body (6), form built-up piston, the group
It closes piston and one end that piston rod (19) is located in cylinder barrel (12) is axially fixed at by locking nut (26) and elastic washer (25)；
Moreover, the built-up piston is integrated with two distinct types of sealing structure along axial simultaneously, including a sealing ring sealing and extremely
A few clearance seal, forms combined sealing structure.
2. the combination sealing arrangement according to claim 1 for hydraulic cylinder piston, it is characterised in that: the piston also wraps
It has included third piston body (11), there are slight radial clearance between third piston body (11) outer round surface and cylinder barrel (12) inner wall,
Form the second clearance seal；Third piston body (11) outer round surface is provided with several the second annular balancing slits parallel to each other
(10)；Third piston body (11) is recessed with the positioning matched with flange (9A) in the one end contacted with the second supporting element (9)
Groove (11A)；It is connected through a screw thread and is fixedly linked between third piston body (11) and second piston body (6).
3. the combination sealing arrangement according to claim 1 or 2 for hydraulic cylinder piston, it is characterised in that: described first
Piston body (2) is along the circumferential direction evenly equipped with notch cuttype through hole (2B), and one end of the notch cuttype through hole (2B) is equipped with connection
The threaded connector of one piston body (2) and second piston body (6), the other end are equipped with the second type of tamper evidence (24).
4. the combination sealing arrangement according to claim 1 or 2 for hydraulic cylinder piston, it is characterised in that: described each
One annular balancing slit (3) vertical sectional shape is shape required for semicircle or other any one, such as the arc of non-semicircle
Shape, V-arrangement, U-shaped, and it is semicircle be respectively combined with V-arrangement, U-shaped, trapezoidal, rectangle made of shape.
5. the combination sealing arrangement according to claim 4 for hydraulic cylinder piston, it is characterised in that: the longitudinal section shape
Shape is semicircular each first annular balancing slit (3), and for channel radii having a size of 0.25mm~0.5mm, depth is 0.5~1mm；Respectively
Spacing between first annular balancing slit (3) is 2mm~5mm.
6. the combination sealing arrangement according to claim 2 for hydraulic cylinder piston, it is characterised in that: second annular
Quantity, vertical sectional shape and the size of balancing slit (10), the first ring with first piston body (2) outer round surface on the built-up piston
Quantity, vertical sectional shape and the size of shape balancing slit (3) correspond to identical or not identical.
7. the combination sealing arrangement according to claim 2 for hydraulic cylinder piston, it is characterised in that: the third piston
Body (11) is along the circumferential direction evenly equipped with notch cuttype through hole (11B), and one end of the notch cuttype through hole (11B) is equipped with connection second
The threaded connector of piston body (6) and third piston body (11), the other end are equipped with the first type of tamper evidence (20).
8. the combination sealing arrangement according to claim 1 or 2 for hydraulic cylinder piston, it is characterised in that: the sealing
Part (7) is using Elastic Teeth used in DAS (double acting seal) combined seal ring or chevron combination sealing coil structures
Shape sealing ring or other be able to satisfy sealing ring of hydraulic cylinder piston dynamic sealing performance requirement, such as O-ring seal etc..
9. a kind of hydraulic cylinder, it is characterised in that: including the group described in any item of the claim 1 to 8 for hydraulic cylinder piston
Close sealing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811327923.2A CN109281889A (en) | 2018-11-09 | 2018-11-09 | A combined sealing device for hydraulic cylinder piston and hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811327923.2A CN109281889A (en) | 2018-11-09 | 2018-11-09 | A combined sealing device for hydraulic cylinder piston and hydraulic cylinder |
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| CN109281889A true CN109281889A (en) | 2019-01-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811327923.2A Pending CN109281889A (en) | 2018-11-09 | 2018-11-09 | A combined sealing device for hydraulic cylinder piston and hydraulic cylinder |
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| Country | Link |
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| CN (1) | CN109281889A (en) |
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| CN110030225A (en) * | 2019-03-14 | 2019-07-19 | 徐州工程学院 | A kind of hydraulic cylinder with spacial seal piston |
| CN112081792A (en) * | 2020-07-29 | 2020-12-15 | 太原重工股份有限公司 | Piston assembly with locking function |
| CN113565824A (en) * | 2021-07-05 | 2021-10-29 | 中国石油化工股份有限公司 | A Piston Sealing Device for Digital Hydraulic Adjustment of High Pressure 3D Models |
| CN113623397A (en) * | 2021-08-23 | 2021-11-09 | 中国计量大学 | A pressure adaptive rubber sealing structure |
| CN114791007A (en) * | 2022-06-23 | 2022-07-26 | 常州市中昊轨道交通科技发展有限公司 | Sealing ring for preventing fluid leakage |
| CN115899012A (en) * | 2023-02-28 | 2023-04-04 | 仪征天华活塞环有限公司 | Piston seal structure and piston device |
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| CN113623397A (en) * | 2021-08-23 | 2021-11-09 | 中国计量大学 | A pressure adaptive rubber sealing structure |
| CN113623397B (en) * | 2021-08-23 | 2023-06-16 | 中国计量大学 | Pressure self-adaptive rubber sealing structure |
| CN114791007A (en) * | 2022-06-23 | 2022-07-26 | 常州市中昊轨道交通科技发展有限公司 | Sealing ring for preventing fluid leakage |
| CN114791007B (en) * | 2022-06-23 | 2022-09-20 | 常州市中昊轨道交通科技发展有限公司 | Sealing ring for preventing fluid leakage |
| CN115899012A (en) * | 2023-02-28 | 2023-04-04 | 仪征天华活塞环有限公司 | Piston seal structure and piston device |
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Application publication date: 20190129 |