CN211009895U - Hydraulic oil cylinder - Google Patents
Hydraulic oil cylinder Download PDFInfo
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- CN211009895U CN211009895U CN201922097540.7U CN201922097540U CN211009895U CN 211009895 U CN211009895 U CN 211009895U CN 201922097540 U CN201922097540 U CN 201922097540U CN 211009895 U CN211009895 U CN 211009895U
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Abstract
The utility model provides a hydraulic cylinder, including cylinder, cylinder cap, piston and piston rod, be equipped with sealing device between cylinder cap and the piston rod, sealing device includes: the first main sealing ring and the second main sealing ring are arranged on the inner periphery of the cylinder cover and are sleeved on the piston rod; the lip of the second main sealing ring is opposite to the lip of the first main sealing ring, and the second main sealing ring is positioned on one side of the first main sealing ring, which is far away from the cylinder barrel; wherein, be equipped with the backpressure chamber in the cylinder cap, the backpressure chamber is equipped with inlet and liquid outlet, and the liquid outlet communicates to between the lip of first main sealing washer and the lip of second main sealing washer, and the inlet is used for linking to each other with outside pressurization pipeline. This hydraulic cylinder through set up the backpressure chamber in the cylinder cap, has improved the power of hugging closely of first main sealing washer and second main sealing washer to the piston rod, and then has improved the leakproofness of first main sealing washer and second main sealing washer to hydraulic cylinder, has improved hydraulic cylinder's life.
Description
Technical Field
The utility model relates to a hydraulic system seals technical field, particularly, relates to a hydraulic cylinder.
Background
The hydraulic cylinder is a hydraulic actuator which converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It has simple structure and reliable operation. When it is used to implement reciprocating motion, it can omit speed-reducing device, and has no transmission gap, and its motion is stable, so that it can be extensively used in various mechanical hydraulic systems. The hydraulic cylinder is basically composed of a cylinder barrel and a cylinder cover, a piston and a piston rod, a sealing device, a buffering device and an exhaust device. The damping device and the exhaust device are determined according to specific application occasions, and other devices are necessary.
The hydraulic oil cylinder is used as a power executing element and a key part which are the most important in a hydraulic transmission system, and is widely applied to the fields of engineering machinery, mining machinery and the like. In the prior art, how to improve the sealing performance of the matching part of the piston rod and the cylinder cover is always a difficult and painful point.
SUMMERY OF THE UTILITY MODEL
In order to solve at least one of the above technical problems, an object of the present invention is to provide a hydraulic cylinder.
In order to realize the above object, the technical scheme of the utility model provides a hydraulic cylinder, including cylinder, cylinder cap, piston and piston rod, the cylinder cap with be equipped with sealing device between the piston rod, sealing device includes: the first main sealing ring and the second main sealing ring are arranged on the inner periphery of the cylinder cover and are sleeved on the piston rod; the lip of the second main sealing ring is opposite to the lip of the first main sealing ring, and the second main sealing ring is positioned on one side of the first main sealing ring, which is far away from the cylinder barrel; the cylinder cover is internally provided with a back pressure cavity, the back pressure cavity is provided with a liquid inlet and a liquid outlet, the liquid outlet is communicated between the lip of the first main sealing ring and the lip of the second main sealing ring, and the liquid inlet is used for being connected with an external pressurization pipeline.
The technical scheme of the utility model provide a hydraulic cylinder, through set up the backpressure chamber in the cylinder cap, the backpressure chamber is after through outside pipeline pressure boost, make the cylinder cap obtain improving to the packing force of first main seal circle and second main seal circle, thereby first main seal circle and second main seal circle power of holding tightly to the piston rod has been improved, and then first main seal circle and second main seal circle to hydraulic cylinder's leakproofness has been improved, external pollutant has effectively been prevented from getting into in the hydraulic cylinder simultaneously greatly reduced hydraulic oil spill over the outer risk of cylinder from the cylinder, hydraulic cylinder's life has been improved.
Specifically, the utility model provides a hydraulic cylinder, including the cylinder, the cylinder cap, piston and piston rod, be provided with sealing device between cylinder cap and piston rod, sealing device includes first main sealing washer and the second main sealing washer of setting at the cylinder cap inner periphery, the lip of first main sealing washer and second main sealing washer sets up relatively, first main sealing washer is used for preventing hydraulic oil from overflowing outside the cylinder barrel from inside the cylinder barrel, the second main sealing washer is used for preventing water or pollutant outside the cylinder barrel from entering the cylinder barrel, through setting up the backpressure chamber in the cylinder cap, the backpressure chamber is equipped with inlet and liquid outlet, the liquid outlet communicates to between the lip of first main sealing washer and the lip of second main sealing washer, the inlet links to each other with outside pressurization pipeline, after the backpressure chamber is pressurized through outside pressurization pipeline, make the packing force of cylinder cap to first main sealing washer and second main sealing washer increase, thereby the cohesion of first main sealing washer and second main sealing washer to the piston rod has been improved, and then improved first main seal circle and second main seal circle to hydraulic cylinder's leakproofness, effectively prevented that external pollutant from getting into hydraulic cylinder in, simultaneously greatly reduced hydraulic oil spill over the risk outside the cylinder from the cylinder, improved hydraulic cylinder's life.
Additionally, the utility model provides a hydraulic cylinder among the above-mentioned technical scheme can also have following additional technical characteristics:
in the above technical scheme, a pressure reducing valve is arranged at the liquid inlet.
Through set up the relief pressure valve in inlet department, the relief pressure valve can be opened automatically when the pressure of inlet reaches preset pressure in order to discharge the liquid part in the backpressure intracavity, preferred exhaust liquid is oil water mixture, because second main seal circle mainly prevents that water from getting into in the cylinder outside the cylinder, consequently and the piston rod between frictional force great, oil water mixture can form the oil film on the piston rod, the oil film can reduce the frictional force between second main seal circle and the piston rod, play the lubrication action, effectively prevent that the second main seal circle from melting with the piston rod sliding fit because of the great high temperature that leads to of frictional force when leading to the second main seal circle, and then improved the life of second main seal circle.
In the technical scheme, the inner periphery of the cylinder cover is circumferentially provided with an annular groove, and the annular groove forms the liquid outlet of the back pressure cavity.
The periphery is equipped with the annular groove along circumference in the cylinder cap, and the annular groove forms the liquid outlet in back pressure chamber, and then the liquid in the back pressure chamber can be followed the periphery's of cylinder cap annular groove and discharged, is convenient for the back pressure chamber to the external flowing back.
In any of the above technical solutions, the sealing device further includes: set up in the first buffering sealing washer of the interior week of cylinder cap, first buffering sealing washer cover is established on the piston rod and be located first main sealing washer with between the cylinder, the lip orientation of first buffering sealing washer the cylinder.
The sealing device further comprises a first buffering sealing ring arranged on the inner periphery of the cylinder cover, the first buffering sealing ring is sleeved on the piston rod and located between the first main sealing ring and the second main sealing ring, the lip of the first buffering sealing ring faces the cylinder barrel, the impact effect of hydraulic oil in the cylinder barrel on the first main sealing ring can be effectively buffered while the sealing effect is achieved, the first main sealing ring is prevented from being damaged due to impact, the sealing performance is improved, and the service life of the first main sealing ring is prolonged.
In the above technical solution, the sealing device further includes: set up in the second buffering sealing washer of the interior week of cylinder cap, second buffering sealing washer cover is established just be located on the piston rod first main sealing washer with between the first buffering sealing washer, the lip of second buffering sealing washer with the lip syntropy setting of first buffering sealing washer.
The sealing device further comprises a second buffer sealing ring arranged on the inner periphery of the cylinder cover, the second buffer sealing ring is sleeved on the piston rod and located between the first main sealing ring and the first buffer sealing ring, and the second buffer sealing ring and the lip opening of the first buffer sealing ring are arranged in the same direction, so that the sealing performance of the sealing device is further improved, meanwhile, the impact of hydraulic oil in the cylinder barrel on the first main sealing ring is further reduced, and the service life of the first main sealing ring is further prolonged.
In the above technical solution, the sealing device further includes: the third buffer sealing ring is arranged on the inner periphery of the cylinder cover, the third buffer sealing ring is sleeved on the piston rod, the third buffer sealing ring is positioned between the liquid outlet of the back pressure cavity and the second main sealing ring, and the lip of the third buffer sealing ring and the lip of the second buffer sealing ring are arranged in the same direction; the first buffer sealing ring, the second buffer sealing ring and the third buffer sealing ring are integrated buffer sealing rings without check rings.
The sealing device further comprises a third buffering sealing ring arranged on the inner periphery of the cylinder cover, the third buffering sealing ring is sleeved on the piston rod and located between a liquid outlet of the back pressure cavity and the second main sealing ring, the third buffering sealing ring plays a role in sealing and simultaneously plays a role in buffering protection, the situation that the pressure of liquid in the back pressure cavity is large and the second main sealing ring is greatly impacted to cause damage is prevented, and therefore the service life of the second main sealing ring is prolonged.
In the above technical scheme, be equipped with three first holding tank on the cylinder cap, first buffering sealing washer, second buffering sealing washer and the lateral part of third buffering sealing washer inlays respectively to be established in three in the first holding tank, inboard with piston rod sliding fit.
Be equipped with three first holding tank on the cylinder cap, inlay respectively through the outside portion with first buffering sealing washer, second buffering sealing washer and third buffering sealing washer and establish in three first holding tank, inboard and piston rod sliding fit to play fixed and guard action, prevent first buffering sealing washer, second buffering sealing washer and the relative cylinder cap reciprocating motion of third buffering sealing washer, improved the seal stability who prevents first buffering sealing washer, second buffering sealing washer and third buffering sealing washer.
In the above technical scheme, the first main seal ring, the second main seal ring, the first buffer seal ring, the second buffer seal ring and the third buffer seal ring are Y-shaped seal rings.
First main seal circle, second main seal circle, first buffering sealing washer, second buffering sealing washer and third buffering sealing washer are Y type sealing washer, and Y type sealing washer sealing performance is reliable, and frictional resistance is less, and the resistance to pressure is good, simple structure, and the installation and the change of being convenient for help reducing the manufacturing cost of product.
In the above technical scheme, two first accommodating grooves are formed in the cylinder cover, the outer side portions of the first main sealing ring and the second main sealing ring are respectively embedded in the two first accommodating grooves, and the inner side of each first accommodating groove is in sliding fit with the piston rod.
Be equipped with two first holding tanks on the cylinder cap, inlay respectively through the outside portion with first main sealing washer and second main sealing washer and establish in two first holding tanks, inboard and piston rod sliding fit to the reciprocal slip takes place for the cylinder cap to restriction first main sealing washer and second main sealing washer, and then improves the sealing reliability of first main sealing washer and second main sealing washer.
In the above technical solution, the sealing device further includes: the first check ring abuts against the end face, close to the cylinder barrel, of the first main sealing ring, the outer side portion of the first check ring is embedded in the first accommodating groove, and the inner side of the first check ring is in sliding fit with the piston rod; and/or the second retainer ring is abutted against the end face, far away from the cylinder barrel, of the second main seal ring, the outer side part of the second retainer ring is embedded in the other first accommodating groove, and the inner side of the second retainer ring is in sliding fit with the piston rod.
Sealing device still includes the first retaining ring that leans on with the terminal surface counterbalance that first main seal circle is close to the cylinder, inlay through the outside portion with first retaining ring and first main seal circle and establish in same first holding tank, inboard and piston rod sliding fit, first retaining ring not only can play certain sealed effect, can also prevent effectively that first main seal circle from taking place because of the great condition of being extruded from first holding tank of frictional resistance when sliding fit with the piston rod, has further improved first main seal circle's sealing reliability.
The sealing device further comprises a second check ring which abuts against the end face, close to the cylinder barrel, of the second main sealing ring, the outer side portions of the second check ring and the second main sealing ring are embedded in the second containing groove, the inner side of the second check ring is in sliding fit with the piston rod, the second check ring can play a certain sealing role, the second main sealing ring can be effectively prevented from being extruded out of the second containing groove due to the fact that friction resistance is large when the second main sealing ring is in sliding fit with the piston rod, and the sealing reliability of the second main sealing ring is further improved.
In the above technical solution, the sealing device further includes: the piston rod reciprocates along the axis direction of the guide channel.
The sealing device further comprises a guide ring, the guide ring is provided with a guide channel for the piston rod to reciprocate, fixing and guiding effects are achieved, the piston rod can slide in a reciprocating mode along the axis direction of the guide channel, so that the piston rod has a fixed motion track, and the stability and the reliability of the operation of the piston rod are guaranteed.
In the above technical solution, the sealing device further includes: the dust ring is arranged on one side, away from the cylinder barrel, of the second main sealing ring, a third accommodating groove is formed in the cylinder cover, the outer side portion of the dust ring is arranged in the third sealing groove, and the inner side of the dust ring is in sliding fit with the piston rod; and
and the steel wire check ring is arranged in the third accommodating groove and is abutted against the end face, far away from the cylinder barrel, of the dust ring so as to fix the steel wire check ring.
Sealing device is still including setting up the dust ring of keeping away from cylinder barrel one side at second main seal circle, and the dust ring sets up in the third holding tank on the cylinder cap, plays dustproof effect, prevents that the outer large granule thing of cylinder barrel or other impurity from getting into inside the hydraulic cylinder to improve hydraulic cylinder's life.
Through set up in the third holding tank with the dust ring keep away from the steel wire retaining ring that the terminal surface counterbalance of cylinder leaned on, play the effect of fixed dust ring to being extruded from the third holding tank when preventing the relative piston rod sliding fit of dust ring, thereby improved the installation reliability of dust ring.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic partial cross-sectional view of a hydraulic cylinder according to some embodiments of the present invention;
fig. 2 is an enlarged schematic view of a portion a in fig. 1.
Wherein, the correspondence between the reference numbers and the component names in fig. 1 and fig. 2 is:
1 piston rod, 201 first buffering sealing washer, 202 second buffering sealing washer, 203 third buffering sealing washer, 301 first retaining ring, 302 second retaining ring, 401 first main sealing washer, 402 second main sealing washer, 5 guide rings, 6 dust ring, 7 steel wire retaining ring, 8 cylinder caps, 801 first holding tank, 9 backpressure chambeies.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A hydraulic cylinder according to some embodiments of the present invention will now be described with reference to fig. 1 and 2.
Example one
As shown in fig. 1, the embodiment of the utility model provides a hydraulic cylinder, including cylinder, cylinder cap 8, piston and piston rod 1, be equipped with sealing device between cylinder cap 8 and the piston rod 1, sealing device includes: the first main sealing ring 401 and the second main sealing ring 402 are arranged on the inner periphery of the cylinder cover 8, and the first main sealing ring 401 and the second main sealing ring 402 are sleeved on the piston rod 1; the lip of the second main seal ring 402 is arranged opposite to the lip of the first main seal ring 401, and the second main seal ring 402 is positioned on one side of the first main seal ring 401 away from the cylinder barrel; wherein, be equipped with back pressure chamber 9 in the cylinder cap 8, back pressure chamber 9 is equipped with inlet and liquid outlet, and the liquid outlet communicates to between the lip of first main seal circle 401 and the lip of second column seal circle, and the inlet is used for linking to each other with outside pressurization pipeline.
The embodiment of the utility model provides a hydraulic cylinder, through set up back pressure chamber 9 in cylinder cap 8, back pressure chamber 9 is after through the outside pipeline pressure boost, make cylinder cap 8 obtain improving first main seal circle 401 and second main seal circle 402's packing force, thereby first main seal circle 401 and second main seal circle 402 hold the power tightly to piston rod 1 has been improved, and then first main seal circle 401 and second main seal circle 402 are improved to hydraulic cylinder's leakproofness, external pollutant has effectively been prevented from getting into in the hydraulic cylinder simultaneously greatly reduced hydraulic oil spill over the outer risk of cylinder in the cylinder, hydraulic cylinder's life has been improved.
Specifically, the utility model provides a hydraulic cylinder, including the cylinder, cylinder cap 8, piston and piston rod 1, be provided with sealing device between cylinder cap 8 and piston rod 1, sealing device includes first main sealing washer 401 and the second main sealing washer 402 of setting at the inner periphery of cylinder cap 8, the lip of first main sealing washer 401 and second main sealing washer 402 sets up relatively, first main sealing washer 401 is used for preventing hydraulic oil from overflowing to the cylinder outside from the cylinder inside, second main sealing washer 402 is used for preventing water or pollutant outside the cylinder from getting into the cylinder, through setting up backpressure chamber 9 in cylinder cap 8, backpressure chamber 9 is equipped with inlet and liquid outlet, the liquid outlet communicates between the lip of first main sealing washer 401 and the lip of second main sealing washer 402, the inlet links to each other with outside pressurization pipeline, after pressurizing backpressure chamber 9 through outside pressurization pipeline, make cylinder cap 8 to the packing force increase of first main sealing washer 401 and second main sealing washer 402, thereby improved first main sealing washer 401 and second main sealing washer 402 and to piston rod 1 hold the power tightly, and then improved first main sealing washer 401 and second main sealing washer 402 to hydraulic cylinder's leakproofness, effectively prevented that external pollutant from getting into hydraulic cylinder in, simultaneously greatly reduced hydraulic oil spill over the risk outside the cylinder from the cylinder, improved hydraulic cylinder's life.
EXAMPLE two (not shown)
In addition to the features of the above embodiments, the present embodiment further defines: a pressure reducing valve is arranged at the liquid inlet.
Through set up the relief pressure valve at inlet department, the relief pressure valve can be opened automatically when the pressure of inlet reaches preset pressure in order to discharge the liquid part in the backpressure chamber 9, preferred discharged liquid is oil water mixture, because second main sealing washer 402 mainly prevents that water from getting into in the cylinder from the cylinder outside, consequently great with the frictional force between the piston rod 1, oil water mixture can form the oil film on piston rod 1, the oil film can reduce the frictional force between second main sealing washer 402 and the piston rod 1, play the lubrication action, effectively prevent that the second main sealing washer 402 from melting with piston rod 1 sliding fit because of the great high temperature that leads to of frictional force when leading to the second main sealing washer 402 to melt, and then improved the life of second main sealing washer 402.
Specifically, an annular groove is formed in the cylinder cover 8 along the circumferential direction, and the annular groove forms a liquid outlet of the back pressure cavity 9.
The periphery is equipped with the annular groove along circumference in the cylinder cap 8, and the annular groove forms the liquid outlet of backpressure chamber 9, and then the liquid in the backpressure chamber 9 can be followed the peripheral annular groove in the cylinder cap 8 and discharged, the outside flowing back in backpressure chamber 9 of being convenient for.
Further, the sealing device further comprises: the first buffer sealing ring 201 is arranged on the inner periphery of the cylinder cover 8, the first buffer sealing ring 201 is sleeved on the piston rod 1 and is located between the first main sealing ring 401 and the cylinder barrel, and a lip of the first buffer sealing ring 201 faces the cylinder barrel, as shown in fig. 1.
The sealing device further comprises a first buffering sealing ring 201 arranged on the inner periphery of the cylinder cover 8, the first buffering sealing ring 201 is sleeved on the piston rod 1 and located between the first main sealing ring 401 and the second main sealing ring 402, the lip of the first buffering sealing ring 201 faces the cylinder barrel, sealing effect is achieved, meanwhile, hydraulic oil in the cylinder barrel can be effectively buffered to impact the first main sealing ring 401, the first main sealing ring 401 is prevented from being damaged due to impact, sealing performance is improved, and the service life of the first main sealing ring 401 is prolonged.
Further, the sealing device further comprises: set up in the second buffering sealing washer 202 of the inner periphery of cylinder cap 8, second buffering sealing washer 202 cover is established on piston rod 1 and is located between first main sealing washer 401 and the first buffering sealing washer 201, and the lip of second buffering sealing washer 202 sets up with the lip syntropy of first buffering sealing washer 201.
The sealing device further comprises a second buffer sealing ring 202 arranged on the inner periphery of the cylinder cover 8, the second buffer sealing ring 202 is sleeved on the piston rod 1 and located between the first main sealing ring 401 and the first buffer sealing ring 201, and the second buffer sealing ring and the lip of the first buffer sealing ring 201 are arranged in the same direction, so that the sealing performance of the sealing device is further improved, meanwhile, the impact of hydraulic oil in the cylinder barrel on the first main sealing ring 401 is further reduced, and the service life of the first main sealing ring 401 is further prolonged.
Further, the sealing device further comprises: the third buffer sealing ring 203 is arranged on the inner periphery of the cylinder cover 8, the third buffer sealing ring 203 is sleeved on the piston rod 1, the third buffer sealing ring 203 is positioned between a liquid outlet of the back pressure cavity 9 and the second main sealing ring 402, and a lip of the third buffer sealing ring 203 and a lip of the second buffer sealing ring 202 are arranged in the same direction; wherein, the inner peripheral surfaces of the first buffer sealing ring 201, the second buffer sealing ring 202 and the third buffer sealing ring 203 which are in sliding fit with the piston rod 1 are provided with an inclined surface at one end close to the lip, and the first buffer sealing ring 201, the second buffer sealing ring 202 and the third buffer sealing ring 203 are all integral buffer sealing rings without retaining rings, as shown in fig. 1 and fig. 2.
The sealing device further comprises a third buffer sealing ring 203 arranged on the inner periphery of the cylinder cover 8, the third buffer sealing ring 203 is sleeved on the piston rod 1 and located between a liquid outlet of the back pressure cavity 9 and the second main sealing ring 402, the third buffer sealing ring 203 plays a role in sealing and simultaneously plays a role in buffering protection, the situation that the pressure of liquid in the back pressure cavity 9 is large and the second main sealing ring 402 is greatly impacted to cause damage is prevented, and therefore the service life of the second main sealing ring 402 is prolonged.
Specifically, three first receiving grooves 801 are formed in the cylinder head 8, and the outer side portions of the first cushion seal ring 201, the second cushion seal ring 202 and the third cushion seal ring 203 are respectively embedded in the three first receiving grooves 801, and the inner side portions are in sliding fit with the piston rod 1, as shown in fig. 1 and 2.
Be equipped with three first holding tank 801 on the cylinder cap 8, through with first buffering sealing washer 201, the outside portion of second buffering sealing washer 202 and third buffering sealing washer 203 inlays respectively establishes in three first holding tank 801, inboard and piston rod 1 sliding fit to play fixed and guard action, prevent first buffering sealing washer 201, second buffering sealing washer 202 and the relative 8 reciprocating motion of cylinder cap of third buffering sealing washer 203, improved the sealing stability who prevents first buffering sealing washer 201, second buffering sealing washer 202 and third buffering sealing washer 203.
Specifically, the first main seal ring 401, the second main seal ring 402, the first cushion seal ring 201, the second cushion seal ring 202, and the third cushion seal ring 203 are all Y-shaped seal rings.
First main seal circle 401, second main seal circle 402, first buffering sealing washer 201, second buffering sealing washer 202 and third buffering sealing washer 203 are Y type sealing washer, and Y type sealing washer sealing performance is reliable, and frictional resistance is less, and the resistance to pressure is good, and simple structure is convenient for install and change, helps reducing the manufacturing cost of product.
Specifically, two first receiving grooves 801 are formed in the cylinder head 8, the outer side portions of the first main seal ring 401 and the second main seal ring 402 are respectively embedded in the two first receiving grooves 801, and the inner side of the first main seal ring 401 and the inner side of the second main seal ring 402 are in sliding fit with the piston rod 1.
Two first accommodating grooves 801 are formed in the cylinder cover 8, the outer side portions of the first main seal ring 401 and the second main seal ring 402 are respectively embedded in the two first accommodating grooves 801, the inner side portions of the first main seal ring 401 and the second main seal ring 402 are in sliding fit with the piston rod 1, so that reciprocating sliding of the first main seal ring 401 and the second main seal ring 402 relative to the cylinder cover 8 is limited, and the sealing reliability of the first main seal ring 401 and the second main seal ring 402 is improved.
Further, the sealing device further comprises: the first retainer ring 301 abuts against the end surface of the first main seal ring 401 close to the cylinder barrel, the outer side part of the first retainer ring 301 is embedded in the first accommodating groove 801, and the inner side of the first retainer ring is in sliding fit with the piston rod 1, as shown in fig. 1.
The sealing device further comprises a first check ring 301 which abuts against the end face, close to the cylinder barrel, of the first main sealing ring 401, the outer side portions of the first check ring 301 and the first main sealing ring 401 are embedded in the same first accommodating groove 801, the inner side of the first check ring is in sliding fit with the piston rod 1, the first check ring 301 not only can play a certain sealing role, but also can effectively prevent the first main sealing ring 401 from being extruded out of the first accommodating groove 801 due to the fact that friction resistance is large when the first main sealing ring 401 is in sliding fit with the piston rod 1, and the sealing reliability of the first main sealing ring 401 is further improved.
Further, the sealing device further includes a second retainer ring 302, which abuts against the end surface of the second main sealing ring 402 away from the cylinder, and the outer side portion of the second retainer ring 302 is embedded in the other first receiving groove 801, and the inner side portion is in sliding fit with the piston rod 1, as shown in fig. 1.
The sealing device further comprises a second check ring 302 which abuts against the end face, close to the cylinder barrel, of the second main sealing ring 402, the outer side portions of the second check ring 302 and the second main sealing ring 402 are embedded in the second containing groove, the inner side of the second check ring is in sliding fit with the piston rod 1, the second check ring 302 not only can play a certain sealing role, but also can effectively prevent the second main sealing ring 402 from being extruded out of the second containing groove due to large friction resistance when in sliding fit with the piston rod 1, and the sealing reliability of the second main sealing ring 402 is further improved.
Further, the sealing device further comprises: the guide ring 5, the guide ring 5 is provided with a guide channel, and the piston rod 1 reciprocates along the axis direction of the guide channel, as shown in fig. 1.
The sealing device further comprises a guide ring 5, the guide ring 5 is provided with a guide channel for the piston rod 1 to reciprocate, fixing and guiding effects are achieved, the piston rod 1 slides in a reciprocating mode along the axis direction of the guide channel, so that the piston rod 1 has a fixed motion track, and the stability and the reliability of the operation of the piston rod 1 are guaranteed.
Further, the sealing device further comprises: the dust ring 6 is arranged on one side, away from the cylinder barrel, of the second main sealing ring 402, a third accommodating groove is formed in the cylinder cover 8, the outer side portion of the dust ring 6 is arranged in the third sealing groove, and the inner side of the dust ring is in sliding fit with the piston rod 1; and the steel wire retainer ring 7 is arranged in the third accommodating groove and is abutted against the end face, far away from the cylinder barrel, of the dust ring 6 so as to fix the steel wire retainer ring 7, as shown in figure 1.
Sealing device is still including setting up the dust ring 6 of keeping away from cylinder barrel one side at second main seal circle 402, and dust ring 6 sets up in the third holding tank on cylinder cap 8, plays dustproof effect, prevents that the outer large granule thing of cylinder barrel or other impurity from getting into inside the hydraulic cylinder to improve hydraulic cylinder's life.
Through set up in the third holding tank with dust ring 6 keep away from the steel wire retaining ring 7 that the terminal surface counterbalance of cylinder leaned on, play fixed dust ring 6's effect to being extruded from the third holding tank when preventing the relative piston rod 1 sliding fit of dust ring 6, thereby improved dust ring 6's installation reliability.
To sum up, the utility model provides a hydraulic cylinder, through set up the backpressure chamber in the cylinder cap, the backpressure chamber has certain pressure after through the outside pipeline pressure boost, make the cylinder cap to the packing force of first main seal circle and second main seal circle, thereby first main seal circle and second main seal circle have been improved and the power of holding tightly to the piston rod, and then first main seal circle and second main seal circle to hydraulic cylinder's leakproofness has been improved, external pollutant has effectively been prevented to get into in the hydraulic cylinder simultaneously greatly reduced hydraulic oil spill over the outer risk of cylinder from the cylinder, hydraulic cylinder's life has been improved.
In the present application, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or unit indicated must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention.
In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a hydraulic cylinder, includes cylinder, cylinder cap, piston and piston rod, the cylinder cap with be equipped with sealing device between the piston rod, its characterized in that, sealing device includes:
the first main sealing ring and the second main sealing ring are arranged on the inner periphery of the cylinder cover and are sleeved on the piston rod;
the lip of the second main sealing ring is opposite to the lip of the first main sealing ring, and the second main sealing ring is positioned on one side of the first main sealing ring, which is far away from the cylinder barrel;
the cylinder cover is internally provided with a back pressure cavity, the back pressure cavity is provided with a liquid inlet and a liquid outlet, the liquid outlet is communicated between the lip of the first main sealing ring and the lip of the second main sealing ring, and the liquid inlet is used for being connected with an external pressurization pipeline.
2. A hydraulic ram according to claim 1,
and a pressure reducing valve is arranged at the liquid inlet.
3. A hydraulic ram according to claim 2,
an annular groove is formed in the periphery of the inner periphery of the cylinder cover in the circumferential direction, and the annular groove forms a liquid outlet of the back pressure cavity.
4. A hydraulic ram according to any one of claims 1 to 3, further comprising:
set up in the first buffering sealing washer of the interior week of cylinder cap, first buffering sealing washer cover is established on the piston rod and be located first main sealing washer with between the cylinder, the lip orientation of first buffering sealing washer the cylinder.
5. The hydraulic ram of claim 4, further comprising:
set up in the second buffering sealing washer of the interior week of cylinder cap, second buffering sealing washer cover is established just be located on the piston rod first main sealing washer with between the first buffering sealing washer, the lip of second buffering sealing washer with the lip syntropy setting of first buffering sealing washer.
6. The hydraulic ram of claim 5, further comprising:
the third buffer sealing ring is arranged on the inner periphery of the cylinder cover, the third buffer sealing ring is sleeved on the piston rod, the third buffer sealing ring is positioned between the liquid outlet of the back pressure cavity and the second main sealing ring, and the lip of the third buffer sealing ring and the lip of the second buffer sealing ring are arranged in the same direction;
the first buffer sealing ring, the second buffer sealing ring and the third buffer sealing ring are integrated buffer sealing rings without check rings.
7. A hydraulic ram according to claim 6,
the cylinder cover is provided with three first accommodating grooves, the outer side parts of the first buffer sealing ring, the second buffer sealing ring and the third buffer sealing ring are respectively embedded in the three first accommodating grooves, and the inner side of each first accommodating groove is in sliding fit with the piston rod.
8. A hydraulic ram according to claim 6,
the first main sealing ring, the second main sealing ring, the first buffer sealing ring, the second buffer sealing ring and the third buffer sealing ring are Y-shaped sealing rings.
9. A hydraulic ram according to any one of claims 1 to 3,
the cylinder cover is provided with two first accommodating grooves, the outer side parts of the first main sealing ring and the second main sealing ring are respectively embedded in the two first accommodating grooves, and the inner side of the first main sealing ring is in sliding fit with the piston rod.
10. The hydraulic ram of claim 9, further comprising:
the first check ring abuts against the end face, close to the cylinder barrel, of the first main sealing ring, the outer side portion of the first check ring is embedded in the first accommodating groove, and the inner side of the first check ring is in sliding fit with the piston rod; and/or
And the second retaining ring is abutted against the end face, far away from the cylinder barrel, of the second main sealing ring, the outer side part of the second retaining ring is embedded in the other first accommodating groove, and the inner side of the second retaining ring is in sliding fit with the piston rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922097540.7U CN211009895U (en) | 2019-11-29 | 2019-11-29 | Hydraulic oil cylinder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922097540.7U CN211009895U (en) | 2019-11-29 | 2019-11-29 | Hydraulic oil cylinder |
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| CN211009895U true CN211009895U (en) | 2020-07-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112747005A (en) * | 2020-12-10 | 2021-05-04 | 唯万科技有限公司 | Pump truck main oil cylinder piston rod sealing system |
| CN112983921A (en) * | 2021-01-05 | 2021-06-18 | 威海中颐液压科技股份有限公司 | Spiral hydraulic swing motor |
-
2019
- 2019-11-29 CN CN201922097540.7U patent/CN211009895U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112747005A (en) * | 2020-12-10 | 2021-05-04 | 唯万科技有限公司 | Pump truck main oil cylinder piston rod sealing system |
| CN112983921A (en) * | 2021-01-05 | 2021-06-18 | 威海中颐液压科技股份有限公司 | Spiral hydraulic swing motor |
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