CN111156222A - Ultra-high temperature sealing device applied to hydraulic cylinder and hydraulic cylinder - Google Patents
Ultra-high temperature sealing device applied to hydraulic cylinder and hydraulic cylinder Download PDFInfo
- Publication number
- CN111156222A CN111156222A CN202010134918.0A CN202010134918A CN111156222A CN 111156222 A CN111156222 A CN 111156222A CN 202010134918 A CN202010134918 A CN 202010134918A CN 111156222 A CN111156222 A CN 111156222A
- Authority
- CN
- China
- Prior art keywords
- hydraulic cylinder
- metal piston
- piston
- piston ring
- sealing device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 38
- 239000002184 metal Substances 0.000 claims abstract description 95
- 229910052751 metal Inorganic materials 0.000 claims abstract description 95
- 229910001018 Cast iron Inorganic materials 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000003746 surface roughness Effects 0.000 claims description 3
- 229910001141 Ductile iron Inorganic materials 0.000 abstract description 9
- 230000000694 effects Effects 0.000 description 8
- 239000010687 lubricating oil Substances 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
Images
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
-
- 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
- F15B15/1428—Cylinders
-
- 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
-
- 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
-
- 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
- F15B2215/00—Fluid-actuated devices for displacing a member from one position to another
- F15B2215/30—Constructional details thereof
- F15B2215/305—Constructional details thereof characterised by the use of special materials
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention belongs to the technical field of hydraulic cylinders, and discloses an ultrahigh-temperature sealing device applied to a hydraulic cylinder and the hydraulic cylinder, wherein the ultrahigh-temperature sealing device comprises a cylinder barrel, the ovality of an inner hole of the cylinder barrel is less than or equal to 0.02mm, the cylinder barrel is made of 38CrMoAlA, and the hardness of the cylinder barrel is greater than or equal to HV 920; the piston is arranged in the inner hole in a sliding mode, the fit clearance between the piston and the inner hole is smaller than or equal to 0.02mm, and the piston is made of nodular cast iron; the metal piston rings are made of special cast iron and are provided with a plurality of metal piston rings, and the plurality of metal piston rings are sequentially arranged along the circumferential direction of the piston and are all positioned in the corresponding mounting grooves on the piston; the metal piston ring is rectangular in radial section and comprises an arc-shaped body and lap joint parts connected to two ends of the arc-shaped body, each lap joint part comprises two lap joint sheets connected to two ends of the arc-shaped body respectively, the two lap joint sheets are arranged in a staggered mode and are attached to each other, and in the axial direction of the piston, the sum of the widths of the two lap joint sheets is equal to the width of the arc-shaped body; the ultrahigh-temperature sealing of the hydraulic cylinder can be realized, and the leakage amount is less than or equal to 20 ml/min.
Description
Technical Field
The invention relates to the technical field of hydraulic cylinders, in particular to an ultrahigh-temperature sealing device applied to a hydraulic cylinder and the hydraulic cylinder.
Background
In the working process of the hydraulic oil cylinder, the working temperature is higher, so that the sealing of the piston is required to resist wear and high temperature. At present, the piston is mainly sealed by materials such as nitrile rubber, fluororubber, polytetrafluoroethylene and the like, but the sealing materials are not high-temperature resistant and short in service life, and are easily corroded by heat to generate leakage events when the temperature is higher than 245 ℃. Especially for the large ladle sliding gate oil cylinder, the working temperature can reach 300 ℃ at most, and the leakage phenomenon is more serious.
In order to solve the problems, the prior art adopts a metal piston ring to replace the sealing structure made of the material, but still has the problem of large leakage amount, and is difficult to apply and popularize.
Disclosure of Invention
The invention aims to provide an ultrahigh-temperature sealing device applied to a hydraulic cylinder and the hydraulic cylinder, so that the hydraulic cylinder can be sealed in an ultrahigh-temperature state, the leakage amount is reduced, and the application range is expanded.
As the conception, the technical scheme adopted by the invention is as follows:
an ultra-high temperature seal for a hydraulic cylinder comprising:
the ovality of an inner hole of the cylinder barrel is less than or equal to 0.02mm, the cylinder barrel is made of 38CrMoAlA, and the hardness of the cylinder barrel is greater than or equal to HV 920;
the piston is arranged in the inner hole in a sliding mode, the fit clearance between the piston and the inner hole is 0.02-0.05 mm, and the piston is made of nodular cast iron;
the metal piston rings are made of special cast iron and are provided with a plurality of metal piston rings, and the plurality of metal piston rings are sequentially arranged along the circumferential direction of the piston and are all positioned in the corresponding mounting grooves on the piston;
the radial cross section of metal piston ring is the rectangle, metal piston ring include the arc body with connect in the overlap joint portion at arc body both ends, overlap joint portion include two connect respectively in the overlap joint piece at arc body both ends, two the overlap joint piece dislocation set up and laminate mutually in the axis direction of piston, two the width sum of overlap joint piece equals the width of arc body.
Furthermore, two overlapping parts of two adjacent metal piston rings form a preset included angle between projections on the same metal piston ring.
Further, the preset included angle is 120 °.
Further, in the circumferential direction of the metal piston ring, the length of the overlapping plate is smaller than the distance between two ends of the arc-shaped body.
Furthermore, in the two overlapping pieces of each overlapping part, one of the overlapping pieces is provided with a groove, and the other overlapping piece is provided with a bulge which can be inserted into the groove.
Furthermore, the protrusion is of a stepped structure and comprises a first protrusion and a second protrusion which are connected, and the first protrusion is connected between the second protrusion and one end of the corresponding arc-shaped body.
Further, in the axial direction of the piston, the width of the metal piston ring is smaller than that of the corresponding mounting groove, and when the metal piston ring moves along with the piston, the metal piston ring can be tightly attached to one side wall of the mounting groove.
Furthermore, when the metal piston ring is tightly attached to one side wall of the mounting groove, a preset gap is formed between the metal piston ring and the other side wall of the mounting groove, and the preset gap is 0.05 mm-0.10 mm
Further, the surface roughness Ra of the inner wall surface of the inner hole is 0.2-0.4 μm.
In order to achieve the purpose, the invention further provides a hydraulic cylinder, which comprises the ultrahigh-temperature sealing device applied to the hydraulic cylinder.
The invention has the beneficial effects that:
according to the ultrahigh-temperature sealing device applied to the hydraulic cylinder, the cylinder barrel is made of 38CrMoAlA, the hardness of the cylinder barrel after heat treatment is larger than or equal to HV920, the piston is made of nodular cast iron, and the metal piston ring is made of special cast iron, so that the sealing between the piston ring and an inner hole can be realized under ultrahigh-temperature and high-pressure conditions, meanwhile, the frictional wear of the metal piston ring is reduced, and the service life of the metal piston ring is prolonged. Setting up to be less than or equal to 0.02mm through the ovality with the hole, set up the piston to 0.02mm ~ 0.05mm with the fit clearance of hole, metal piston ring sets up to including the arc body and connects in the overlap joint portion at arc body both ends, overlap joint portion includes two and connects respectively in the overlap joint piece at arc body both ends, two overlap joint piece dislocation set up and laminate mutually, make metal piston ring form complete sealed face in week, and in the axis direction of piston, the sum of the width of two overlap joint pieces equals the width of arc body, can improve metal piston ring's sealed effect, make the leakage quantity be less than or equal to 20 ml/min.
Drawings
FIG. 1 is a schematic view of an ultrahigh-temperature sealing device applied to a hydraulic cylinder according to one embodiment of the invention;
FIG. 2 is a schematic view of a metal piston ring according to an embodiment of the present invention;
FIG. 3 is a partial schematic view of a metal piston ring according to an embodiment of the present invention;
fig. 4 is a partial schematic view of a metal piston ring according to a second embodiment of the present invention.
In the figure:
1. a cylinder barrel; 11. an inner bore; 2. a piston; 21. mounting grooves; 3. a metal piston ring; 31. an arc-shaped body; 32. a lap joint section; 321. a strap.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have any special meaning.
Example one
As shown in fig. 1 to 3, the present embodiment provides an ultra-high temperature seal device applied to a hydraulic cylinder, which includes a cylinder tube 1, a piston 2, and a metal piston ring 3. Wherein, the ovality of the inner hole 11 of the cylinder barrel 1 is less than or equal to 0.02mm, the cylinder barrel 1 is made of 38CrMoAlA, and the hardness of the cylinder barrel 1 after heat treatment is more than or equal to HV 920. The piston 2 is movably arranged in the inner hole 11, the fit clearance between the piston 2 and the inner hole 11 is 0.02-0.05 mm, and the piston 2 is made of nodular cast iron. The metal piston rings 3 are made of special cast iron, the metal piston rings 3 are provided with a plurality of metal piston rings 3, the plurality of metal piston rings 3 are sequentially arranged along the circumferential direction of the piston 2 and are all located in the corresponding mounting grooves 21 on the piston 2, specifically, in the present embodiment, the number of the metal piston rings 3 is four, and of course, in other embodiments, the number of the metal piston rings 3 can also be set according to actual needs.
Specifically, the cylinder barrel 1 is made of 38CrMoAlA, the 38CrMoAlA is heat-resistant nitrided steel, and has the characteristics of high wear resistance, high thermal stability, high fatigue strength, high strength and the like, the heat treatment of the cylinder barrel 1 adopts modulated glow ion desalination treatment, so that the hardness of the cylinder barrel 1 reaches over HV920, the hardness of the inner wall surface of the inner hole 11 of the cylinder barrel 1 is higher than that of the piston 2 and the metal piston ring 3 by 2-3 pressure levels, and the metal piston ring 3 is prevented from scratching the inner wall surface of the inner hole 11 and abrasion of the inner wall surface of the inner hole 11 is avoided.
The piston 2 is made of nodular cast iron, such as ferrite nodular cast iron of QT500-7 or QT450-10, and the metallographic structure of the ferrite nodular cast iron is pearlite, ferrite and spheroidal graphite, so that the piston has good lubricating effect and wear resistance. In addition, the ductile iron has a smaller linear expansion coefficient than steel and bronze, and thus can prevent the phenomenon of "expansion seizure" in a high-temperature state.
The metal piston ring 3 is made of special cast iron, such as Cu-Cr-Mo cast iron, and has high strength, plasticity, toughness, wear resistance, severe heat and pressure impact resistance, high or low temperature resistance, corrosion resistance and dimensional stability. Specifically, the metal piston ring 3 made of special cast iron can bear the pressure of 200Mpa, has good heat dissipation capacity, and can dissipate heat through oil and the cylinder barrel 1. In addition, the metal piston ring 3 is pressed tightly on the inner wall surface of the inner hole 11 and the groove surface of the mounting groove 21 by means of elastic tension of the metal piston ring, a good lubricating oil film is established in a moving state, sealing and lubricating effects are achieved, compared with rubber sealing, the metal piston ring has higher running speed, and the highest linear speed can reach 40 m/s.
As shown in fig. 2, the width of the metal piston ring 3 in the axial direction of the piston 2 is smaller than the width of the corresponding mounting groove 21. The piston 2 reciprocates relative to the cylinder 1 under the action of the hydraulic medium in the cylinder 1, and when the metal piston ring 3 moves along with the piston 2, the metal piston ring 3 is tightly attached to one side wall of the mounting groove 21, and a preset gap is formed between the metal piston ring 3 and the other side wall of the mounting groove 21. In the embodiment, the preset gap is 0.05 mm-0.10 mm, if the preset gap is too small, when the piston 2 moves in a reversing manner in the cylinder barrel 1, the metal sealing ring 3 is easily blocked due to the resistance of a hydraulic medium, and the sealing effect is affected; if the preset clearance is too large, when the piston 2 moves in the cylinder barrel 1 in a reversing way, the time for the metal sealing ring 3 to be tightly attached to one side wall of the installation groove 21 to be tightly attached to the other side wall is longer, and the leakage amount is increased.
The operation of the metal piston ring 3 will be described by taking the example shown in fig. 2. For convenience of description, the metal piston ring 3 in the ab direction is named as a first metal piston ring, a second metal piston ring … … and an Nth metal piston ring in this order, and N is 2 or more. When piston 2 removed along ab direction, hydraulic medium flowed in the clearance between the internal face of piston 2 and hole 11 and supported first metal piston ring to press in mounting groove 21 near the lateral wall of second metal piston ring, and hydraulic medium enters into mounting groove 21 through the predetermined clearance between the other lateral wall of metal piston ring 3 and mounting groove 21 simultaneously to radially acting on metal piston ring 3 at piston 2, make the outer peripheral face of metal piston ring 3 closely laminate with the internal face of hole 11, form sealedly. And the greater the pressure of the hydraulic medium, the closer the metal piston ring 3 is attached to the side wall of the mounting groove 21 and the inner wall surface of the metal piston ring 3 and the inner bore 11. It will be appreciated that even if there is leakage of hydraulic medium past the first metal piston ring into the rear, it will be sealed by the second metal piston ring, the third metal piston ring, etc.
Alternatively, the metal piston ring 3 has a predetermined elastic force in the radial direction thereof, and the specific value can be referred to as "GBT 1149.7-2010 engine piston ring part 7: rectangular cast iron rings ". It is understood that the elastic force of the metal piston ring 3 itself causes the metal piston ring 3 to adhere to the inner wall surface of the inner bore 11. The excessive elasticity easily causes that a lubricating oil film cannot be formed between the metal piston ring 3 and the inner wall surface of the inner hole 11, and the abrasion of the metal piston ring 3 is aggravated; if the spring force is too small, the sealing effect between the metal piston ring 3 and the inner wall surface of the bore 11 is weakened, and the leakage amount is increased.
Further, in the present embodiment, the two overlapping portions 32 of two adjacent metal piston rings 3 form a predetermined included angle between the projections on the same metal piston ring 3. Further preferably, the preset included angle is 120 °, so that the overlapping portions 32 of two adjacent metal piston rings 3 are staggered, and the leakage amount is further reduced.
Further, in the present embodiment, the surface roughness Ra of the inner wall surface of the bore 11 is 0.2 μm to 0.4 μm, and the frictional wear between the metal piston ring 3 and the inner wall surface of the bore 11 can be further reduced.
In conclusion, the ultrahigh-temperature sealing device applied to the hydraulic cylinder provided by the embodiment has the advantages that the cylinder barrel 1 is made of 38CrMoAlA, the hardness of the cylinder barrel 1 after heat treatment is greater than or equal to HV920, the piston 2 is made of nodular cast iron, and the metal piston ring 3 is made of special cast iron, so that the hydraulic cylinder can be sealed under ultrahigh-temperature and high-pressure conditions, the friction and wear of the cylinder barrel 1 are reduced, and the service life of the hydraulic cylinder is prolonged. Setting up to be less than or equal to 0.02mm through the ovality with hole 11, set up piston 2 and hole 11's fit clearance to 0.02 ~ 0.05mm, metal piston ring 3 sets up to including arc body 31 and connect in the overlap joint portion 32 at arc body both ends, overlap joint portion 32 includes two and connects respectively in the overlap joint piece 321 at arc body 31 both ends, two overlap joint piece 321 dislocation set up and laminate mutually, make metal piston ring 3 form complete sealed face in week, and on piston 2's axis direction, the width sum of two overlap joint pieces 321 equals the width of arc body 31, can improve metal piston ring 3's sealed effect, make the volume of revealing be less than or equal to 20 ml/min. It can be understood that, through the arrangement, the ultrahigh-temperature sealing of the hydraulic cylinder can be realized, and the leakage amount can be less than or equal to 20 ml/min. In this embodiment, the "ultra-high temperature" indicates a temperature of 300 ℃, and when the instantaneous temperature exceeds 300 ℃, the ultra-high temperature sealing device provided by this embodiment can still work normally within a certain time.
The embodiment also provides a hydraulic cylinder, which is provided with the ultrahigh-temperature sealing device applied to the hydraulic cylinder.
Example two
The structure of the ultra-high temperature sealing device applied to the hydraulic cylinder provided by the embodiment is basically the same as that of the ultra-high temperature sealing device applied to the hydraulic cylinder in the first embodiment, and the difference is that: as shown in fig. 4, in the two overlapping pieces 321 of the overlapping portion 32 of the metal piston ring 3 in the present embodiment, one of the overlapping pieces 321 is provided with a groove, and the other overlapping piece 321 is provided with a protrusion that can be inserted into the groove. Specifically, the protrusion is of a stepped structure, and includes a first protrusion and a second protrusion connected to each other, and the first protrusion is connected between the second protrusion and one end of the corresponding arc-shaped body 31. Through setting up arch and recess, can improve two overlapping flap 321's laminating degree, further improve sealed effect.
The rest of the structures of the superhigh temperature sealing device applied to the hydraulic cylinder provided by the embodiment are the same as the superhigh temperature sealing device applied to the hydraulic cylinder in the first embodiment, and are not described again here.
The embodiment also provides a hydraulic cylinder, which is provided with the ultrahigh-temperature sealing device applied to the hydraulic cylinder.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. An ultra-high temperature sealing device applied to a hydraulic cylinder is characterized by comprising:
the ovality of an inner hole (11) of the cylinder barrel (1) is less than or equal to 0.02mm, the cylinder barrel (1) is made of 38CrMoAlA, and the hardness of the cylinder barrel (1) after heat treatment is greater than or equal to HV 920;
the piston (2) is arranged in the inner hole (11) in a sliding mode, the fit clearance between the piston (2) and the inner hole (11) is 0.025 mm-0.05 mm, and the piston (2) is made of ball-milled cast iron;
the metal piston rings (3) are made of special cast iron and are provided with a plurality of metal piston rings, and the metal piston rings (3) are sequentially arranged along the circumferential direction of the piston (2) and are all positioned in the corresponding mounting grooves (21) on the piston (2);
the radial cross section of metal piston ring (3) is the rectangle, metal piston ring (3) include arc body (31) and connect in overlap joint portion (32) at arc body (31) both ends, overlap joint portion (32) include two connect respectively in overlap joint piece (321) at arc body (31) both ends, two overlap joint piece (321) dislocation set just laminates mutually in the axis direction of piston (2), two the width sum of overlap joint piece (321) equals the width of arc body (31).
2. The ultra-high temperature sealing device applied to hydraulic cylinders according to claim 1, characterized in that two overlapping portions (32) of two adjacent metal piston rings (3) form a preset included angle between the projections of the same metal piston ring (3).
3. The ultra-high temperature sealing device applied to the hydraulic cylinder according to claim 2, wherein the preset included angle is 120 °.
4. The ultra-high temperature sealing device applied to hydraulic cylinders according to claim 1, characterized in that the length of the overlapping tab (321) is smaller than the distance between the two ends of the arc-shaped body (3) in the circumferential direction of the metal piston ring (3).
5. The ultra-high temperature sealing device applied to a hydraulic cylinder, according to claim 1, wherein one of the two overlapping flaps (321) of each overlapping part (32) is provided with a groove, and the other overlapping flap (321) is provided with a protrusion that can be inserted into the groove.
6. The ultra-high temperature sealing device applied to the hydraulic cylinder according to claim 5, wherein the protrusion has a stepped structure, and the protrusion comprises a first protrusion and a second protrusion which are connected, and the first protrusion is connected between the second protrusion and one end of the corresponding arc-shaped body (31).
7. The ultra-high temperature sealing device applied to the hydraulic cylinder is characterized in that the width of the metal piston ring (3) in the axial direction of the piston (2) is smaller than the width of the corresponding mounting groove (21), and when the metal piston ring (3) moves along with the piston (2), the metal piston ring (3) can be tightly attached to one side wall of the mounting groove (21).
8. The ultra-high temperature sealing device applied to the hydraulic cylinder according to claim 7, wherein when the metal piston ring (3) is tightly attached to one side wall of the mounting groove (21), a preset gap is formed between the metal piston ring (3) and the other side wall of the mounting groove (21), and the preset gap is 0.05 mm-0.10 mm.
9. The superhigh temperature sealing apparatus applied to the hydraulic cylinder according to claim 1, wherein the surface roughness Ra of the inner wall surface of the inner bore (11) is 0.2 μm to 0.4 μm.
10. Hydraulic cylinder, characterized in that it comprises an ultra-high temperature seal applied to a hydraulic cylinder according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010134918.0A CN111156222A (en) | 2020-03-02 | 2020-03-02 | Ultra-high temperature sealing device applied to hydraulic cylinder and hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010134918.0A CN111156222A (en) | 2020-03-02 | 2020-03-02 | Ultra-high temperature sealing device applied to hydraulic cylinder and hydraulic cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111156222A true CN111156222A (en) | 2020-05-15 |
Family
ID=70566759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010134918.0A Pending CN111156222A (en) | 2020-03-02 | 2020-03-02 | Ultra-high temperature sealing device applied to hydraulic cylinder and hydraulic cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111156222A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114151412A (en) * | 2021-12-13 | 2022-03-08 | 徐州徐工液压件有限公司 | Soft and hard sealing combined piston sealing system of hydraulic cylinder and function implementation method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2132839Y (en) * | 1992-08-15 | 1993-05-12 | 王岐岳 | Opening lapping piston ring |
| CN2777289Y (en) * | 2005-03-05 | 2006-05-03 | 庞达 | Piston ring |
| CN101037976A (en) * | 2007-04-17 | 2007-09-19 | 何俊明 | Enclosed piston ring and matching assembly method thereof |
| CN201016310Y (en) * | 2007-01-24 | 2008-02-06 | 杨帜政 | Integral piston ring |
| CN201407229Y (en) * | 2009-03-30 | 2010-02-17 | 张伟 | Ultrahigh temperature oil cylinder of slide gate |
| CN211820172U (en) * | 2020-03-02 | 2020-10-30 | 北京中冶迈克液压有限责任公司 | Ultra-high temperature sealing device applied to hydraulic cylinder and hydraulic cylinder |
-
2020
- 2020-03-02 CN CN202010134918.0A patent/CN111156222A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2132839Y (en) * | 1992-08-15 | 1993-05-12 | 王岐岳 | Opening lapping piston ring |
| CN2777289Y (en) * | 2005-03-05 | 2006-05-03 | 庞达 | Piston ring |
| CN201016310Y (en) * | 2007-01-24 | 2008-02-06 | 杨帜政 | Integral piston ring |
| CN101037976A (en) * | 2007-04-17 | 2007-09-19 | 何俊明 | Enclosed piston ring and matching assembly method thereof |
| CN201407229Y (en) * | 2009-03-30 | 2010-02-17 | 张伟 | Ultrahigh temperature oil cylinder of slide gate |
| CN211820172U (en) * | 2020-03-02 | 2020-10-30 | 北京中冶迈克液压有限责任公司 | Ultra-high temperature sealing device applied to hydraulic cylinder and hydraulic cylinder |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114151412A (en) * | 2021-12-13 | 2022-03-08 | 徐州徐工液压件有限公司 | Soft and hard sealing combined piston sealing system of hydraulic cylinder and function implementation method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2045488B1 (en) | Piston ring of reciprocating engine | |
| US6206381B1 (en) | Multi-layer metal gasket | |
| JPH09210211A (en) | Seal ring | |
| CN101725588A (en) | Hydraulic cylinder with clearance sealed type deformed piston | |
| CN211820172U (en) | Ultra-high temperature sealing device applied to hydraulic cylinder and hydraulic cylinder | |
| EP2577116B1 (en) | Oil control ring of ferrous body for internal combustion engines | |
| CN111156222A (en) | Ultra-high temperature sealing device applied to hydraulic cylinder and hydraulic cylinder | |
| US9163725B2 (en) | Oil control ring with ferrous body less than 2.0 millimeters high for internal combustion engines | |
| US7806415B2 (en) | Cylinder head gasket | |
| CN210510258U (en) | Ablation-resistant bimetal combined piston ring assembly and internal combustion engine adopting same | |
| US5921558A (en) | High recovery combustion seal gasket | |
| CN210510257U (en) | Light-weight wear-resistant bimetal combined piston ring assembly and internal combustion engine adopting same | |
| CN111237163A (en) | Piston ring sealing system with long service life | |
| US8616556B2 (en) | Combined oil ring | |
| CN202611916U (en) | Diamond-like carbon cladding combined-type piston ring | |
| CN211573723U (en) | Long-life piston ring sealing system | |
| CN210484592U (en) | Anti-bending bimetal combined piston ring and internal combustion engine adopting same | |
| JP3666052B2 (en) | piston ring | |
| US6726218B2 (en) | Compression piston ring for use in internal combustion engine | |
| JP2012515888A (en) | Sealing sleeve | |
| JP2017026054A (en) | piston ring | |
| US20200309063A1 (en) | Structure for sealing cylinder block and cylinder head | |
| US20240110625A1 (en) | Compression Ring | |
| US11959552B2 (en) | Piston ring system for an internal combustion engine with direct water injection | |
| CN216111036U (en) | Piston ring and methanol engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20220330 Address after: 301800 room 300-6, building 3, Zhongguancun Science and Technology City collaborative development center, the intersection of Xihuan North Road and Tangtong highway, Baodi District, Tianjin Applicant after: MCC Mike (Tianjin) Hydraulic Technology Co.,Ltd. Address before: 100076 south side of Yinghai town government, Daxing District, Beijing Applicant before: BEIJING MECC HYDRAULIC Co.,Ltd. |