CN112012980A - Integrated sealing device for piston and sealing method thereof - Google Patents

Integrated sealing device for piston and sealing method thereof Download PDF

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Publication number
CN112012980A
CN112012980A CN202010916157.4A CN202010916157A CN112012980A CN 112012980 A CN112012980 A CN 112012980A CN 202010916157 A CN202010916157 A CN 202010916157A CN 112012980 A CN112012980 A CN 112012980A
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CN
China
Prior art keywords
piston
ring
sealing device
copper powder
metal ring
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CN202010916157.4A
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Chinese (zh)
Inventor
张泽栋
杨荣
王爱玲
江行舟
何燕州
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BEIJING JINZI TIANCHENG HYDRAULIC TECHNOLOGY CO LTD
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BEIJING JINZI TIANCHENG HYDRAULIC TECHNOLOGY CO LTD
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Priority to CN202010916157.4A priority Critical patent/CN112012980A/en
Publication of CN112012980A publication Critical patent/CN112012980A/en
Pending legal-status Critical Current

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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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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Sealing Devices (AREA)

Abstract

The invention discloses an integrated sealing device for a piston, which comprises a piston, a cylinder body and a sealing device, wherein the piston is arranged in an inner cavity of the cylinder body, the sealing device comprises a metal ring and a copper powder filled polytetrafluoroethylene ring which are sequentially arranged from inside to outside, a compression nut is arranged below the sealing device and is in threaded connection with the bottom of the piston, the metal ring is arranged on the outer side of the lower part of the piston, the copper powder filled polytetrafluoroethylene ring is hot-arranged on the outer side of the metal ring, the interference magnitude between the copper powder filled polytetrafluoroethylene ring and the metal ring is 10mm, and the outer wall of the copper powder filled polytetrafluoroethylene ring is attached to the side wall of the inner cavity of the cylinder body. The invention also discloses a sealing method. The invention effectively improves the wear resistance, self-lubrication and anti-deformation capability of the sealing device and prolongs the service life of the sealing device.

Description

Integrated sealing device for piston and sealing method thereof
Technical Field
The invention relates to an integrated sealing device for a piston and a sealing method thereof, belonging to the field of industrial sealing.
Background
In the field of metallurgy, a hydraulic cylinder is a main executing element, the performance of the hydraulic cylinder directly affects the final quality of a rolled product, the selection of a sealing element is particularly important for the service performance and the service life of the hydraulic cylinder, a part to be sealed is usually between two mechanical coupling surfaces needing sealing, and the sealing is divided into a dynamic sealing class and a static sealing class according to the fact that the coupling surfaces move relatively when a machine operates. Working media in the hydraulic cylinder are mostly 46 # anti-wear hydraulic oil, and the rubber square ring can accelerate the aging speed of the square ring and influence the service life of sealing when being used in the environment for a long time. The traditional movable seal installation process is complicated, the rubber square ring needs to be installed into a seal groove firstly, the polytetrafluoroethylene sealing ring is heated and installed into the groove, and the polytetrafluoroethylene sealing ring cannot be restored if the temperature and the assembling force are not well controlled in the assembling link, and finally cannot be used.
Disclosure of Invention
The invention aims to provide an integrated sealing device for a piston and a sealing method of the integrated sealing device for the piston, which is formed by a copper powder filled polytetrafluoroethylene ring and a metal ring, effectively improves the wear resistance, self-lubrication and deformation resistance of the sealing device, and prolongs the service life of the sealing device.
In order to solve the technical problems, the invention adopts the following technical scheme: an integrated sealing device for a piston comprises the piston, a cylinder body and a sealing device, wherein the piston is arranged in an inner cavity of the cylinder body, the sealing device comprises a metal ring and a copper powder filled polytetrafluoroethylene ring which are sequentially arranged from inside to outside, a compression nut is arranged below the sealing device and is in threaded connection with the bottom of the piston, the metal ring is arranged on the outer side of the lower portion of the piston, the copper powder filled polytetrafluoroethylene ring is hot-assembled on the outer side of the metal ring, the interference magnitude between the copper powder filled polytetrafluoroethylene ring and the metal ring is 10mm, and the outer wall of the copper powder filled polytetrafluoroethylene ring is attached to the side wall of the inner cavity of the cylinder body; the copper powder is filled into the polytetrafluoroethylene ring, so that the abrasion resistance and the self-lubricating property of the seal are effectively improved, the deformation resistance of the integrated sealing device is improved by using the metal ring, the service life of the sealing device is prolonged, the compression nut is in threaded connection with the bottom of the piston, the sealing device is compressed, and the overall sealing performance of the sealing device is improved.
In the above integrated sealing device for the piston, a first groove is arranged between the piston and the metal ring, and an O-ring is arranged on the inner surface of the first groove; the O-shaped sealing ring is used for static sealing, so that the overall performance of the sealing device is improved.
In the integrated sealing device for the piston, a rod cavity is arranged between the side wall of the piston and the inner cavity of the cylinder body, and a rodless cavity is arranged between the bottom of the piston and the inner cavity of the cylinder body; the rod cavity and the rodless cavity are used for storing pressure oil, and when the piston moves, the pressure difference in the cylinder body is changed under the action of the oil pressure.
According to the integrated sealing device for the piston, the outer surface of the metal ring is provided with the plurality of second grooves which are distributed on the outer surface of the metal ring at equal intervals, the distance between the plurality of second grooves is 10mm, the roughness of the outer surface of the metal ring is 12.5um, and the roughness of the inner surface of the metal ring is 0.8 um; the air in the second ditch groove can be discharged because of thermal rising in the hot-charging process, can form the negative pressure zone in the second ditch groove after the hot-charging, makes copper powder fill polytetrafluoroethylene ring and hugs closely on the becket, and the roughness of the surface of becket is 12.5um, and the roughness of the internal surface of becket is 0.8um, has improved sealing device wholeness ability.
According to the integrated sealing device for the piston, a plurality of annular oil grooves are formed in the outer surface of the copper powder filled polytetrafluoroethylene ring, the annular oil grooves are equidistantly distributed on the outer surface of the copper powder filled polytetrafluoroethylene ring, and the distance between the plurality of annular oil grooves is 20 mm; when pressure oil in the cylinder body flows into the annular oil groove, the outer surface of the copper powder filled polytetrafluoroethylene ring is tightly attached to the inner wall of the cylinder body under the action of the oil pressure.
According to the integrated sealing device for the piston, the inner surface of the copper powder filled polytetrafluoroethylene ring is provided with a hot-assembly binding surface, the roughness of the hot-assembly binding surface is 6.3 microns, the outer surface of the copper powder filled polytetrafluoroethylene ring is provided with a dynamic seal binding surface, the dynamic seal binding surface comprises an upper dynamic seal binding surface, a lower dynamic seal binding surface and a middle guide surface, the diameter of the upper dynamic seal binding surface is larger than the inner diameter of a cylinder body, the difference is 0.5-0.55mm, the inner diameter of the lower dynamic seal binding surface is larger than the diameter of the cylinder body, the difference is 0.5-0.55mm, the diameter of the middle guide surface is smaller than the inner diameter of the cylinder body, and the difference is 0.05-0.1 mm; the roughness of the hot-fitting binding surface is 6.3um, so that the copper powder filled polytetrafluoroethylene ring is tightly attached to the metal ring; when pressure oil in the cylinder body flows into the dynamic sealing joint surface, the dynamic sealing joint surface is tightly attached to the inner wall of the cylinder body under the action of the oil pressure because the diameter of the dynamic sealing joint surface is different from that of the cylinder body, and the overall performance of the sealing device is improved.
According to the integrated sealing device for the piston, a first inclined plane is arranged on one surface, away from the side wall of the inner cavity of the cylinder body, of the upper dynamic sealing joint surface, a second inclined plane is arranged on one surface, away from the side wall of the inner cavity of the cylinder body, of the lower dynamic sealing joint surface, an included angle a is formed between the first inclined plane and the piston, an included angle b is formed between the second inclined plane and the compression nut, and both the angle a and the angle b are 0.5 degrees; when the piston moves, when pressure oil flows into the included angle a and the included angle b, the upper dynamic sealing joint surface and the lower dynamic sealing joint surface are tightly attached to the inner wall of the cylinder body under the action of oil pressure.
In the integrated sealing device for the piston, an upper inner cavity is arranged between the first inclined surface and the piston, and a lower inner cavity is arranged between the second inclined surface and the compression nut; the upper portion inner chamber is the contained angle region between first inclined plane and the piston, and the lower part inner chamber is the contained angle region between second inclined plane and gland nut, and when pressure oil flowed into upper portion inner chamber and lower part inner chamber, can make upper dynamic seal binding face and lower dynamic seal binding face hug closely with the inner wall of cylinder body under the effect of oil pressure.
In the above integrated sealing device for a piston, the material of the metal ring 4 is 42 chromium molybdenum steel; the 42 chromium molybdenum steel has high strength and toughness, good low-temperature impact toughness and deformation resistance, and prolongs the service life of the sealing device 3.
A sealing method of an integrated sealing device for a piston comprises the following steps:
s1, sleeving an O-shaped sealing ring in the first groove;
s2, sleeving a metal ring on the outer side of the lower part of the piston provided with the O-shaped sealing ring;
s3, heating copper powder to fill the polytetrafluoroethylene ring; then sleeving the heated copper powder filled polytetrafluoroethylene ring on the outer side of the metal ring; in the process that the hot-loading copper powder is filled in the polytetrafluoroethylene ring at the outer side of the metal ring, the hot-loading binding surface of the copper powder filled polytetrafluoroethylene ring is tightly attached to the metal ring, the heating temperature is 165-175 ℃, and the heating time is 45-55 minutes.
Compared with the prior art, the piston comprises the piston, a cylinder body and a sealing device, wherein the piston is arranged in an inner cavity of the cylinder body, the sealing device comprises a metal ring and a copper powder filled polytetrafluoroethylene ring which are sequentially arranged from inside to outside, the outer wall of the copper powder filled polytetrafluoroethylene ring is attached to the side wall of the inner cavity of the cylinder body, and meanwhile, a sealing method of the integrated sealing device for the piston is further provided.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the construction of the sealing device of the present invention;
FIG. 3 is an enlarged view of A of FIG. 1 in accordance with the present invention;
FIG. 4 is an enlarged view of B of FIG. 1 in accordance with the present invention;
FIG. 5 is an enlarged view of C of FIG. 1 in accordance with the present invention;
fig. 6 is an isometric view of the sealing device of the present invention.
Reference numerals: 1-piston, 2-cylinder, 3-sealing device, 4-metal ring, 5-copper powder filled polytetrafluoroethylene ring, 6-compression nut, 7-first groove, 8-O-shaped sealing ring, 9-rod cavity, 10-rodless cavity, 11-second groove, 12-annular oil groove, 13-hot-fit binding surface, 14-dynamic sealing binding surface, 15-upper dynamic sealing binding surface, 16-lower dynamic sealing binding surface, 17-middle guide surface, 18-first inclined surface, 19-second inclined surface, 20-upper inner cavity and 21-lower inner cavity.
The invention is further described with reference to the following figures and detailed description.
Detailed Description
Example 1 of the invention: an integrated sealing device for a piston comprises a piston 1, a cylinder body 2 and a sealing device 3, wherein the piston 1 is arranged in an inner cavity of the cylinder body 2, the sealing device 3 comprises a metal ring 4 and a copper powder filled polytetrafluoroethylene ring 5 which are sequentially arranged from inside to outside, a compression nut 6 is arranged below the sealing device 3, the compression nut 6 is in threaded connection with the bottom of the piston 1, the metal ring 4 is arranged on the outer side of the lower portion of the piston 1, the copper powder filled polytetrafluoroethylene ring 5 is hot-mounted on the outer side of the metal ring 4, the interference between the copper powder filled polytetrafluoroethylene ring 5 and the metal ring 4 is 10mm, and the outer wall of the copper powder filled polytetrafluoroethylene ring 5 is attached to the side wall of the inner cavity of the cylinder body 2; the polytetrafluoroethylene ring 5 filled with the copper powder effectively improves the abrasion resistance and the self-lubricating property of the seal, the metal ring 4 improves the deformation resistance of the integrated sealing device 3, the service life of the sealing device 3 is prolonged, the compression nut 6 is in threaded connection with the bottom of the piston 1, the sealing device 3 is compressed, and the overall sealing performance of the sealing device 3 is improved.
Example 2 of the invention: an integrated sealing device for a piston comprises a piston 1, a cylinder body 2 and a sealing device 3, wherein the piston 1 is arranged in an inner cavity of the cylinder body 2, the sealing device 3 comprises a metal ring 4 and a copper powder filled polytetrafluoroethylene ring 5 which are sequentially arranged from inside to outside, a compression nut 6 is arranged below the sealing device 3, the compression nut 6 is in threaded connection with the bottom of the piston 1, the metal ring 4 is arranged on the outer side of the lower portion of the piston 1, the copper powder filled polytetrafluoroethylene ring 5 is hot-mounted on the outer side of the metal ring 4, the interference between the copper powder filled polytetrafluoroethylene ring 5 and the metal ring 4 is 10mm, and the outer wall of the copper powder filled polytetrafluoroethylene ring 5 is attached to the side wall of the inner cavity of the cylinder body 2; the polytetrafluoroethylene ring 5 filled with the copper powder effectively improves the abrasion resistance and self-lubrication of the seal, the anti-deformation capacity of the integrated sealing device 3 is improved due to the use of the metal ring 4, the service life of the sealing device 3 is prolonged, the compression nut 6 is in threaded connection with the bottom of the piston 1 to compress the sealing device 3, and the overall sealing performance of the sealing device 3 is improved; a first groove 7 is formed between the piston 1 and the metal ring 4, and an O-shaped sealing ring 8 is arranged on the inner surface of the first groove 7; the O-shaped sealing ring 8 is used for static sealing, so that the overall performance of the sealing device 3 is improved.
Example 3 of the invention: an integrated sealing device for a piston comprises a piston 1, a cylinder body 2 and a sealing device 3, wherein the piston 1 is arranged in an inner cavity of the cylinder body 2, the sealing device 3 comprises a metal ring 4 and a copper powder filled polytetrafluoroethylene ring 5 which are sequentially arranged from inside to outside, a compression nut 6 is arranged below the sealing device 3, the compression nut 6 is in threaded connection with the bottom of the piston 1, the metal ring 4 is arranged on the outer side of the lower portion of the piston 1, the copper powder filled polytetrafluoroethylene ring 5 is hot-mounted on the outer side of the metal ring 4, the interference between the copper powder filled polytetrafluoroethylene ring 5 and the metal ring 4 is 10mm, and the outer wall of the copper powder filled polytetrafluoroethylene ring 5 is attached to the side wall of the inner cavity of the cylinder body 2; the polytetrafluoroethylene ring 5 filled with the copper powder effectively improves the abrasion resistance and self-lubrication of the seal, the anti-deformation capacity of the integrated sealing device 3 is improved due to the use of the metal ring 4, the service life of the sealing device 3 is prolonged, the compression nut 6 is in threaded connection with the bottom of the piston 1 to compress the sealing device 3, and the overall sealing performance of the sealing device 3 is improved; a first groove 7 is formed between the piston 1 and the metal ring 4, and an O-shaped sealing ring 8 is arranged on the inner surface of the first groove 7; the O-shaped sealing ring 8 is used for static sealing, so that the overall performance of the sealing device 3 is improved; a rod cavity 9 is arranged between the side wall of the piston 1 and the inner cavity of the cylinder body 2, and a rodless cavity 10 is arranged between the bottom of the piston 1 and the inner cavity of the cylinder body 2; the rod chamber 9 and the rodless chamber 10 store pressure oil, and when the piston 1 moves, the pressure difference in the cylinder body 2 is changed under the action of the oil pressure.
Example 4 of the invention: an integrated sealing device for a piston comprises a piston 1, a cylinder body 2 and a sealing device 3, wherein the piston 1 is arranged in an inner cavity of the cylinder body 2, the sealing device 3 comprises a metal ring 4 and a copper powder filled polytetrafluoroethylene ring 5 which are sequentially arranged from inside to outside, a compression nut 6 is arranged below the sealing device 3, the compression nut 6 is in threaded connection with the bottom of the piston 1, the metal ring 4 is arranged on the outer side of the lower portion of the piston 1, the copper powder filled polytetrafluoroethylene ring 5 is hot-mounted on the outer side of the metal ring 4, the interference between the copper powder filled polytetrafluoroethylene ring 5 and the metal ring 4 is 10mm, and the outer wall of the copper powder filled polytetrafluoroethylene ring 5 is attached to the side wall of the inner cavity of the cylinder body 2; the polytetrafluoroethylene ring 5 filled with the copper powder effectively improves the abrasion resistance and self-lubrication of the seal, the anti-deformation capacity of the integrated sealing device 3 is improved due to the use of the metal ring 4, the service life of the sealing device 3 is prolonged, the compression nut 6 is in threaded connection with the bottom of the piston 1 to compress the sealing device 3, and the overall sealing performance of the sealing device 3 is improved; a first groove 7 is formed between the piston 1 and the metal ring 4, and an O-shaped sealing ring 8 is arranged on the inner surface of the first groove 7; the O-shaped sealing ring 8 is used for static sealing, so that the overall performance of the sealing device 3 is improved; a rod cavity 9 is arranged between the side wall of the piston 1 and the inner cavity of the cylinder body 2, and a rodless cavity 10 is arranged between the bottom of the piston 1 and the inner cavity of the cylinder body 2; the rod cavity 9 and the rodless cavity 10 are used for storing pressure oil, and when the piston 1 moves, the pressure difference in the cylinder body 2 is changed under the action of the oil pressure; the outer surface of the metal ring 4 is provided with a plurality of second grooves 11, the second grooves 11 are equidistantly distributed on the outer surface of the metal ring 4, the distance between the second grooves 11 is 10mm, the roughness of the outer surface of the metal ring 4 is 12.5um, and the roughness of the inner surface of the metal ring 4 is 0.8 um; the air in the second groove 11 can be discharged because of the rising of heat in the hot charging process, and a negative pressure zone can be formed in the second groove 11 after the hot charging, so that the copper powder filled polytetrafluoroethylene ring 5 is tightly attached to the metal ring 4, the roughness of the outer surface of the metal ring 4 is 12.5um, the roughness of the inner surface of the metal ring 4 is 0.8um, and the overall performance of the sealing device 3 is improved.
Example 5 of the invention: an integrated sealing device for a piston comprises a piston 1, a cylinder body 2 and a sealing device 3, wherein the piston 1 is arranged in an inner cavity of the cylinder body 2, the sealing device 3 comprises a metal ring 4 and a copper powder filled polytetrafluoroethylene ring 5 which are sequentially arranged from inside to outside, a compression nut 6 is arranged below the sealing device 3, the compression nut 6 is in threaded connection with the bottom of the piston 1, the metal ring 4 is arranged on the outer side of the lower portion of the piston 1, the copper powder filled polytetrafluoroethylene ring 5 is hot-mounted on the outer side of the metal ring 4, the interference between the copper powder filled polytetrafluoroethylene ring 5 and the metal ring 4 is 10mm, and the outer wall of the copper powder filled polytetrafluoroethylene ring 5 is attached to the side wall of the inner cavity of the cylinder body 2; the polytetrafluoroethylene ring 5 filled with the copper powder effectively improves the abrasion resistance and self-lubrication of the seal, the anti-deformation capacity of the integrated sealing device 3 is improved due to the use of the metal ring 4, the service life of the sealing device 3 is prolonged, the compression nut 6 is in threaded connection with the bottom of the piston 1 to compress the sealing device 3, and the overall sealing performance of the sealing device 3 is improved; a first groove 7 is formed between the piston 1 and the metal ring 4, and an O-shaped sealing ring 8 is arranged on the inner surface of the first groove 7; the O-shaped sealing ring 8 is used for static sealing, so that the overall performance of the sealing device 3 is improved; a rod cavity 9 is arranged between the side wall of the piston 1 and the inner cavity of the cylinder body 2, and a rodless cavity 10 is arranged between the bottom of the piston 1 and the inner cavity of the cylinder body 2; the rod cavity 9 and the rodless cavity 10 are used for storing pressure oil, and when the piston 1 moves, the pressure difference in the cylinder body 2 is changed under the action of the oil pressure; the outer surface of the metal ring 4 is provided with a plurality of second grooves 11, the second grooves 11 are equidistantly distributed on the outer surface of the metal ring 4, the distance between the second grooves 11 is 10mm, the roughness of the outer surface of the metal ring 4 is 12.5um, and the roughness of the inner surface of the metal ring 4 is 0.8 um; air in the second groove 11 can be exhausted due to the rise of heat in the hot charging process, a negative pressure region can be formed in the second groove 11 after the hot charging, so that the copper powder filled polytetrafluoroethylene ring 5 is tightly attached to the metal ring 4, the roughness of the outer surface of the metal ring 4 is 12.5 microns, the roughness of the inner surface of the metal ring 4 is 0.8 microns, and the overall performance of the sealing device 3 is improved; a plurality of annular oil grooves 12 are formed in the outer surface of the copper powder filled polytetrafluoroethylene ring 5, the annular oil grooves 12 are equidistantly distributed on the outer surface of the copper powder filled polytetrafluoroethylene ring 5, and the distance between the plurality of annular oil grooves 12 is 20 mm; when the pressure oil in the cylinder 2 flows into the annular oil groove 12, the outer surface of the copper powder filled polytetrafluoroethylene ring 5 is brought into close contact with the inner wall of the cylinder 2 by the action of the oil pressure.
Example 6 of the invention: an integrated sealing device for a piston comprises a piston 1, a cylinder body 2 and a sealing device 3, wherein the piston 1 is arranged in an inner cavity of the cylinder body 2, the sealing device 3 comprises a metal ring 4 and a copper powder filled polytetrafluoroethylene ring 5 which are sequentially arranged from inside to outside, a compression nut 6 is arranged below the sealing device 3, the compression nut 6 is in threaded connection with the bottom of the piston 1, the metal ring 4 is arranged on the outer side of the lower portion of the piston 1, the copper powder filled polytetrafluoroethylene ring 5 is hot-mounted on the outer side of the metal ring 4, the interference between the copper powder filled polytetrafluoroethylene ring 5 and the metal ring 4 is 10mm, and the outer wall of the copper powder filled polytetrafluoroethylene ring 5 is attached to the side wall of the inner cavity of the cylinder body 2; the polytetrafluoroethylene ring 5 filled with the copper powder effectively improves the abrasion resistance and self-lubrication of the seal, the anti-deformation capacity of the integrated sealing device 3 is improved due to the use of the metal ring 4, the service life of the sealing device 3 is prolonged, the compression nut 6 is in threaded connection with the bottom of the piston 1 to compress the sealing device 3, and the overall sealing performance of the sealing device 3 is improved; a first groove 7 is formed between the piston 1 and the metal ring 4, and an O-shaped sealing ring 8 is arranged on the inner surface of the first groove 7; the O-shaped sealing ring 8 is used for static sealing, so that the overall performance of the sealing device 3 is improved; a rod cavity 9 is arranged between the side wall of the piston 1 and the inner cavity of the cylinder body 2, and a rodless cavity 10 is arranged between the bottom of the piston 1 and the inner cavity of the cylinder body 2; the rod cavity 9 and the rodless cavity 10 are used for storing pressure oil, and when the piston 1 moves, the pressure difference in the cylinder body 2 is changed under the action of the oil pressure; the outer surface of the metal ring 4 is provided with a plurality of second grooves 11, the second grooves 11 are equidistantly distributed on the outer surface of the metal ring 4, the distance between the second grooves 11 is 10mm, the roughness of the outer surface of the metal ring 4 is 12.5um, and the roughness of the inner surface of the metal ring 4 is 0.8 um; air in the second groove 11 can be exhausted due to the rise of heat in the hot charging process, a negative pressure region can be formed in the second groove 11 after the hot charging, so that the copper powder filled polytetrafluoroethylene ring 5 is tightly attached to the metal ring 4, the roughness of the outer surface of the metal ring 4 is 12.5 microns, the roughness of the inner surface of the metal ring 4 is 0.8 microns, and the overall performance of the sealing device 3 is improved; a plurality of annular oil grooves 12 are formed in the outer surface of the copper powder filled polytetrafluoroethylene ring 5, the annular oil grooves 12 are equidistantly distributed on the outer surface of the copper powder filled polytetrafluoroethylene ring 5, and the distance between the plurality of annular oil grooves 12 is 20 mm; when pressure oil in the cylinder body 2 flows into the annular oil groove 12, the copper powder filled on the outer surface of the polytetrafluoroethylene ring 5 is tightly attached to the inner wall of the cylinder body 2 under the action of the oil pressure; the inner surface of the copper powder filled polytetrafluoroethylene ring 5 is provided with a hot-assembly binding surface 13, the roughness of the hot-assembly binding surface 13 is 6.3 microns, the outer surface of the copper powder filled polytetrafluoroethylene ring 5 is provided with a movable sealing binding surface 14, the movable sealing binding surface 14 comprises an upper movable sealing binding surface 15, a lower movable sealing binding surface 16 and a middle guide surface 17, the diameter of the upper movable sealing binding surface 15 is larger than the inner diameter of the cylinder body 2, the difference value is 0.5-0.55mm, the inner diameter of the lower movable sealing binding surface 16 is larger than the diameter of the cylinder body 2, the difference value is 0.5-0.55mm, and the diameter of the middle guide surface 17 is smaller than the inner diameter of the cylinder body 2, and the difference value is 0.05-0.1 mm; the roughness of the hot-fit binding surface 13 is 6.3um, so that the copper powder filled polytetrafluoroethylene ring 5 is tightly attached to the metal ring 4; when the pressure oil in the cylinder 2 flows into the dynamic seal contact surface 14, the dynamic seal contact surface 14 is brought into close contact with the inner wall of the cylinder 2 by the pressure oil because the diameter of the dynamic seal contact surface 14 is different from that of the cylinder 2, thereby improving the overall performance of the sealing device 3.
Example 7 of the invention: an integrated sealing device for a piston comprises a piston 1, a cylinder body 2 and a sealing device 3, wherein the piston 1 is arranged in an inner cavity of the cylinder body 2, the sealing device 3 comprises a metal ring 4 and a copper powder filled polytetrafluoroethylene ring 5 which are sequentially arranged from inside to outside, a compression nut 6 is arranged below the sealing device 3, the compression nut 6 is in threaded connection with the bottom of the piston 1, the metal ring 4 is arranged on the outer side of the lower portion of the piston 1, the copper powder filled polytetrafluoroethylene ring 5 is hot-mounted on the outer side of the metal ring 4, the interference between the copper powder filled polytetrafluoroethylene ring 5 and the metal ring 4 is 10mm, and the outer wall of the copper powder filled polytetrafluoroethylene ring 5 is attached to the side wall of the inner cavity of the cylinder body 2; the polytetrafluoroethylene ring 5 filled with the copper powder effectively improves the abrasion resistance and self-lubrication of the seal, the anti-deformation capacity of the integrated sealing device 3 is improved due to the use of the metal ring 4, the service life of the sealing device 3 is prolonged, the compression nut 6 is in threaded connection with the bottom of the piston 1 to compress the sealing device 3, and the overall sealing performance of the sealing device 3 is improved; a first groove 7 is formed between the piston 1 and the metal ring 4, and an O-shaped sealing ring 8 is arranged on the inner surface of the first groove 7; the O-shaped sealing ring 8 is used for static sealing, so that the overall performance of the sealing device 3 is improved; a rod cavity 9 is arranged between the side wall of the piston 1 and the inner cavity of the cylinder body 2, and a rodless cavity 10 is arranged between the bottom of the piston 1 and the inner cavity of the cylinder body 2; the rod cavity 9 and the rodless cavity 10 are used for storing pressure oil, and when the piston 1 moves, the pressure difference in the cylinder body 2 is changed under the action of the oil pressure; the outer surface of the metal ring 4 is provided with a plurality of second grooves 11, the second grooves 11 are equidistantly distributed on the outer surface of the metal ring 4, the distance between the second grooves 11 is 10mm, the roughness of the outer surface of the metal ring 4 is 12.5um, and the roughness of the inner surface of the metal ring 4 is 0.8 um; air in the second groove 11 can be exhausted due to the rise of heat in the hot charging process, a negative pressure region can be formed in the second groove 11 after the hot charging, so that the copper powder filled polytetrafluoroethylene ring 5 is tightly attached to the metal ring 4, the roughness of the outer surface of the metal ring 4 is 12.5 microns, the roughness of the inner surface of the metal ring 4 is 0.8 microns, and the overall performance of the sealing device 3 is improved; a plurality of annular oil grooves 12 are formed in the outer surface of the copper powder filled polytetrafluoroethylene ring 5, the annular oil grooves 12 are equidistantly distributed on the outer surface of the copper powder filled polytetrafluoroethylene ring 5, and the distance between the plurality of annular oil grooves 12 is 20 mm; when pressure oil in the cylinder body 2 flows into the annular oil groove 12, the copper powder filled on the outer surface of the polytetrafluoroethylene ring 5 is tightly attached to the inner wall of the cylinder body 2 under the action of the oil pressure; the inner surface of the copper powder filled polytetrafluoroethylene ring 5 is provided with a hot-assembly binding surface 13, the roughness of the hot-assembly binding surface 13 is 6.3 microns, the outer surface of the copper powder filled polytetrafluoroethylene ring 5 is provided with a movable sealing binding surface 14, the movable sealing binding surface 14 comprises an upper movable sealing binding surface 15, a lower movable sealing binding surface 16 and a middle guide surface 17, the diameter of the upper movable sealing binding surface 15 is larger than the inner diameter of the cylinder body 2, the difference value is 0.5-0.55mm, the inner diameter of the lower movable sealing binding surface 16 is larger than the diameter of the cylinder body 2, the difference value is 0.5-0.55mm, and the diameter of the middle guide surface 17 is smaller than the inner diameter of the cylinder body 2, and the difference value is 0.05-0.1 mm; the roughness of the hot-fit binding surface 13 is 6.3um, so that the copper powder filled polytetrafluoroethylene ring 5 is tightly attached to the metal ring 4; when the pressure oil in the cylinder body 2 flows into the dynamic sealing joint surface 14, the dynamic sealing joint surface 14 is tightly attached to the inner wall of the cylinder body 2 under the action of the oil pressure because the diameter of the dynamic sealing joint surface 14 is different from that of the cylinder body 2, so that the overall performance of the sealing device 3 is improved; a first inclined plane 18 is arranged on one surface, away from the side wall of the inner cavity of the cylinder body 2, of the upper movable sealing attaching surface 15, a second inclined plane 19 is arranged on one surface, away from the side wall of the inner cavity of the cylinder body 2, of the lower movable sealing attaching surface 16, an included angle a is formed between the first inclined plane 18 and the piston 1, an included angle b is formed between the second inclined plane 19 and the compression nut 6, and both the angle a and the angle b are 0.5 degrees; when the piston 1 moves, when pressure oil flows into the included angle a and the included angle b, the upper dynamic seal joint surface 15 and the lower dynamic seal joint surface 16 are enabled to be tightly attached to the inner wall of the cylinder body 2 under the action of oil pressure.
Example 8 of the invention: an integrated sealing device for a piston comprises a piston 1, a cylinder body 2 and a sealing device 3, wherein the piston 1 is arranged in an inner cavity of the cylinder body 2, the sealing device 3 comprises a metal ring 4 and a copper powder filled polytetrafluoroethylene ring 5 which are sequentially arranged from inside to outside, a compression nut 6 is arranged below the sealing device 3, the compression nut 6 is in threaded connection with the bottom of the piston 1, the metal ring 4 is arranged on the outer side of the lower portion of the piston 1, the copper powder filled polytetrafluoroethylene ring 5 is hot-mounted on the outer side of the metal ring 4, the interference between the copper powder filled polytetrafluoroethylene ring 5 and the metal ring 4 is 10mm, and the outer wall of the copper powder filled polytetrafluoroethylene ring 5 is attached to the side wall of the inner cavity of the cylinder body 2; the polytetrafluoroethylene ring 5 filled with the copper powder effectively improves the abrasion resistance and self-lubrication of the seal, the anti-deformation capacity of the integrated sealing device 3 is improved due to the use of the metal ring 4, the service life of the sealing device 3 is prolonged, the compression nut 6 is in threaded connection with the bottom of the piston 1 to compress the sealing device 3, and the overall sealing performance of the sealing device 3 is improved; a first groove 7 is formed between the piston 1 and the metal ring 4, and an O-shaped sealing ring 8 is arranged on the inner surface of the first groove 7; the O-shaped sealing ring 8 is used for static sealing, so that the overall performance of the sealing device 3 is improved; a rod cavity 9 is arranged between the side wall of the piston 1 and the inner cavity of the cylinder body 2, and a rodless cavity 10 is arranged between the bottom of the piston 1 and the inner cavity of the cylinder body 2; the rod cavity 9 and the rodless cavity 10 are used for storing pressure oil, and when the piston 1 moves, the pressure difference in the cylinder body 2 is changed under the action of the oil pressure; the outer surface of the metal ring 4 is provided with a plurality of second grooves 11, the second grooves 11 are equidistantly distributed on the outer surface of the metal ring 4, the distance between the second grooves 11 is 10mm, the roughness of the outer surface of the metal ring 4 is 12.5um, and the roughness of the inner surface of the metal ring 4 is 0.8 um; air in the second groove 11 can be exhausted due to the rise of heat in the hot charging process, a negative pressure region can be formed in the second groove 11 after the hot charging, so that the copper powder filled polytetrafluoroethylene ring 5 is tightly attached to the metal ring 4, the roughness of the outer surface of the metal ring 4 is 12.5 microns, the roughness of the inner surface of the metal ring 4 is 0.8 microns, and the overall performance of the sealing device 3 is improved; a plurality of annular oil grooves 12 are formed in the outer surface of the copper powder filled polytetrafluoroethylene ring 5, the annular oil grooves 12 are equidistantly distributed on the outer surface of the copper powder filled polytetrafluoroethylene ring 5, and the distance between the plurality of annular oil grooves 12 is 20 mm; when pressure oil in the cylinder body 2 flows into the annular oil groove 12, the copper powder filled on the outer surface of the polytetrafluoroethylene ring 5 is tightly attached to the inner wall of the cylinder body 2 under the action of the oil pressure; the inner surface of the copper powder filled polytetrafluoroethylene ring 5 is provided with a hot-assembly binding surface 13, the roughness of the hot-assembly binding surface 13 is 6.3 microns, the outer surface of the copper powder filled polytetrafluoroethylene ring 5 is provided with a movable sealing binding surface 14, the movable sealing binding surface 14 comprises an upper movable sealing binding surface 15, a lower movable sealing binding surface 16 and a middle guide surface 17, the diameter of the upper movable sealing binding surface 15 is larger than the inner diameter of the cylinder body 2, the difference value is 0.5-0.55mm, the inner diameter of the lower movable sealing binding surface 16 is larger than the diameter of the cylinder body 2, the difference value is 0.5-0.55mm, and the diameter of the middle guide surface 17 is smaller than the inner diameter of the cylinder body 2, and the difference value is 0.05-0.1 mm; the roughness of the hot-fit binding surface 13 is 6.3um, so that the copper powder filled polytetrafluoroethylene ring 5 is tightly attached to the metal ring 4; when the pressure oil in the cylinder body 2 flows into the dynamic sealing joint surface 14, the dynamic sealing joint surface 14 is tightly attached to the inner wall of the cylinder body 2 under the action of the oil pressure because the diameter of the dynamic sealing joint surface 14 is different from that of the cylinder body 2, so that the overall performance of the sealing device 3 is improved; a first inclined plane 18 is arranged on one surface, away from the side wall of the inner cavity of the cylinder body 2, of the upper movable sealing attaching surface 15, a second inclined plane 19 is arranged on one surface, away from the side wall of the inner cavity of the cylinder body 2, of the lower movable sealing attaching surface 16, an included angle a is formed between the first inclined plane 18 and the piston 1, an included angle b is formed between the second inclined plane 19 and the compression nut 6, and both the angle a and the angle b are 0.5 degrees; when the piston 1 moves, when pressure oil flows into the included angle a and the included angle b, the upper dynamic seal joint surface 15 and the lower dynamic seal joint surface 16 are tightly attached to the inner wall of the cylinder body 2 under the action of oil pressure; an upper inner cavity 20 is arranged between the first inclined surface 18 and the piston 1, and a lower inner cavity 21 is arranged between the second inclined surface 19 and the compression nut 6; the upper inner cavity 20 is an included angle area between the first inclined surface 18 and the piston 1, the lower inner cavity 21 is an included angle area between the second inclined surface 19 and the compression nut 6, and when pressure oil flows into the upper inner cavity 20 and the lower inner cavity 21, the upper dynamic sealing joint surface 15 and the lower dynamic sealing joint surface 16 can be tightly attached to the inner wall of the cylinder body 2 under the action of oil pressure.
Example 9 of the invention: an integrated sealing device for a piston comprises a piston 1, a cylinder body 2 and a sealing device 3, wherein the piston 1 is arranged in an inner cavity of the cylinder body 2, the sealing device 3 comprises a metal ring 4 and a copper powder filled polytetrafluoroethylene ring 5 which are sequentially arranged from inside to outside, a compression nut 6 is arranged below the sealing device 3, the compression nut 6 is in threaded connection with the bottom of the piston 1, the metal ring 4 is arranged on the outer side of the lower portion of the piston 1, the copper powder filled polytetrafluoroethylene ring 5 is hot-mounted on the outer side of the metal ring 4, the interference between the copper powder filled polytetrafluoroethylene ring 5 and the metal ring 4 is 10mm, and the outer wall of the copper powder filled polytetrafluoroethylene ring 5 is attached to the side wall of the inner cavity of the cylinder body 2; the polytetrafluoroethylene ring 5 filled with the copper powder effectively improves the abrasion resistance and self-lubrication of the seal, the anti-deformation capacity of the integrated sealing device 3 is improved due to the use of the metal ring 4, the service life of the sealing device 3 is prolonged, the compression nut 6 is in threaded connection with the bottom of the piston 1 to compress the sealing device 3, and the overall sealing performance of the sealing device 3 is improved; a first groove 7 is formed between the piston 1 and the metal ring 4, and an O-shaped sealing ring 8 is arranged on the inner surface of the first groove 7; the O-shaped sealing ring 8 is used for static sealing, so that the overall performance of the sealing device 3 is improved; a rod cavity 9 is arranged between the side wall of the piston 1 and the inner cavity of the cylinder body 2, and a rodless cavity 10 is arranged between the bottom of the piston 1 and the inner cavity of the cylinder body 2; the rod cavity 9 and the rodless cavity 10 are used for storing pressure oil, and when the piston 1 moves, the pressure difference in the cylinder body 2 is changed under the action of the oil pressure; the outer surface of the metal ring 4 is provided with a plurality of second grooves 11, the second grooves 11 are equidistantly distributed on the outer surface of the metal ring 4, the distance between the second grooves 11 is 10mm, the roughness of the outer surface of the metal ring 4 is 12.5um, and the roughness of the inner surface of the metal ring 4 is 0.8 um; air in the second groove 11 can be exhausted due to the rise of heat in the hot charging process, a negative pressure region can be formed in the second groove 11 after the hot charging, so that the copper powder filled polytetrafluoroethylene ring 5 is tightly attached to the metal ring 4, the roughness of the outer surface of the metal ring 4 is 12.5 microns, the roughness of the inner surface of the metal ring 4 is 0.8 microns, and the overall performance of the sealing device 3 is improved; a plurality of annular oil grooves 12 are formed in the outer surface of the copper powder filled polytetrafluoroethylene ring 5, the annular oil grooves 12 are equidistantly distributed on the outer surface of the copper powder filled polytetrafluoroethylene ring 5, and the distance between the plurality of annular oil grooves 12 is 20 mm; when pressure oil in the cylinder body 2 flows into the annular oil groove 12, the copper powder filled on the outer surface of the polytetrafluoroethylene ring 5 is tightly attached to the inner wall of the cylinder body 2 under the action of the oil pressure; the inner surface of the copper powder filled polytetrafluoroethylene ring 5 is provided with a hot-assembly binding surface 13, the roughness of the hot-assembly binding surface 13 is 6.3 microns, the outer surface of the copper powder filled polytetrafluoroethylene ring 5 is provided with a movable sealing binding surface 14, the movable sealing binding surface 14 comprises an upper movable sealing binding surface 15, a lower movable sealing binding surface 16 and a middle guide surface 17, the diameter of the upper movable sealing binding surface 15 is larger than the inner diameter of the cylinder body 2, the difference value is 0.5-0.55mm, the inner diameter of the lower movable sealing binding surface 16 is larger than the diameter of the cylinder body 2, the difference value is 0.5-0.55mm, and the diameter of the middle guide surface 17 is smaller than the inner diameter of the cylinder body 2, and the difference value is 0.05-0.1 mm; the roughness of the hot-fit binding surface 13 is 6.3um, so that the copper powder filled polytetrafluoroethylene ring 5 is tightly attached to the metal ring 4; when the pressure oil in the cylinder body 2 flows into the dynamic sealing joint surface 14, the dynamic sealing joint surface 14 is tightly attached to the inner wall of the cylinder body 2 under the action of the oil pressure because the diameter of the dynamic sealing joint surface 14 is different from that of the cylinder body 2, so that the overall performance of the sealing device 3 is improved; a first inclined plane 18 is arranged on one surface, away from the side wall of the inner cavity of the cylinder body 2, of the upper movable sealing attaching surface 15, a second inclined plane 19 is arranged on one surface, away from the side wall of the inner cavity of the cylinder body 2, of the lower movable sealing attaching surface 16, an included angle a is formed between the first inclined plane 18 and the piston 1, an included angle b is formed between the second inclined plane 19 and the compression nut 6, and both the angle a and the angle b are 0.5 degrees; when the piston 1 moves, when pressure oil flows into the included angle a and the included angle b, the upper dynamic seal joint surface 15 and the lower dynamic seal joint surface 16 are tightly attached to the inner wall of the cylinder body 2 under the action of oil pressure; an upper inner cavity 20 is arranged between the first inclined surface 18 and the piston 1, and a lower inner cavity 21 is arranged between the second inclined surface 19 and the compression nut 6; the upper inner cavity 20 is an included angle area between the first inclined surface 18 and the piston 1, the lower inner cavity 21 is an included angle area between the second inclined surface 19 and the compression nut 6, and when pressure oil flows into the upper inner cavity 20 and the lower inner cavity 21, the upper dynamic sealing joint surface 15 and the lower dynamic sealing joint surface 16 can be tightly attached to the inner wall of the cylinder body 2 under the action of oil pressure; the metal ring 4 is made of 42 chromium molybdenum steel; the 42 chromium molybdenum steel has high strength and toughness, good low-temperature impact toughness and deformation resistance, and prolongs the service life of the sealing device 3.
A sealing method of an integrated sealing device for a piston comprises the following steps:
s1, sleeving the O-shaped sealing ring 8 in the first groove 7;
s2, sleeving the metal ring 4 on the outer side of the lower part of the piston 1 provided with the O-shaped sealing ring 8;
s3, heating copper powder to fill the polytetrafluoroethylene ring 5; then sleeving the heated copper powder filled polytetrafluoroethylene ring 5 on the outer side of the metal ring 4; in the process that the hot-loading copper powder is filled in the polytetrafluoroethylene ring 5 and is arranged on the outer side of the metal ring 4, the hot-loading binding surface 13 of the copper powder filled polytetrafluoroethylene ring 5 is tightly attached to the metal ring 4, the heating temperature is 165-175 ℃, and the heating time is 45-55 minutes.
Example 10 of the present invention: an integrated sealing device for a piston comprises a piston 1, a cylinder body 2 and a sealing device 3, wherein the piston 1 is arranged in an inner cavity of the cylinder body 2, the sealing device 3 comprises a metal ring 4 and a copper powder filled polytetrafluoroethylene ring 5 which are sequentially arranged from inside to outside, a compression nut 6 is arranged below the sealing device 3, the compression nut 6 is in threaded connection with the bottom of the piston 1, the metal ring 4 is arranged on the outer side of the lower portion of the piston 1, the copper powder filled polytetrafluoroethylene ring 5 is hot-mounted on the outer side of the metal ring 4, the interference between the copper powder filled polytetrafluoroethylene ring 5 and the metal ring 4 is 10mm, and the outer wall of the copper powder filled polytetrafluoroethylene ring 5 is attached to the side wall of the inner cavity of the cylinder body 2; the polytetrafluoroethylene ring 5 filled with the copper powder effectively improves the abrasion resistance and self-lubrication of the seal, the anti-deformation capacity of the integrated sealing device 3 is improved due to the use of the metal ring 4, the service life of the sealing device 3 is prolonged, the compression nut 6 is in threaded connection with the bottom of the piston 1 to compress the sealing device 3, and the overall sealing performance of the sealing device 3 is improved; a first groove 7 is formed between the piston 1 and the metal ring 4, and an O-shaped sealing ring 8 is arranged on the inner surface of the first groove 7; the O-shaped sealing ring 8 is used for static sealing, so that the overall performance of the sealing device 3 is improved; a rod cavity 9 is arranged between the side wall of the piston 1 and the inner cavity of the cylinder body 2, and a rodless cavity 10 is arranged between the bottom of the piston 1 and the inner cavity of the cylinder body 2; the rod cavity 9 and the rodless cavity 10 are used for storing pressure oil, and when the piston 1 moves, the pressure difference in the cylinder body 2 is changed under the action of the oil pressure; the outer surface of the metal ring 4 is provided with a plurality of second grooves 11, the second grooves 11 are equidistantly distributed on the outer surface of the metal ring 4, the distance between the second grooves 11 is 10mm, the roughness of the outer surface of the metal ring 4 is 12.5um, and the roughness of the inner surface of the metal ring 4 is 0.8 um; air in the second groove 11 can be exhausted due to the rise of heat in the hot charging process, a negative pressure region can be formed in the second groove 11 after the hot charging, so that the copper powder filled polytetrafluoroethylene ring 5 is tightly attached to the metal ring 4, the roughness of the outer surface of the metal ring 4 is 12.5 microns, the roughness of the inner surface of the metal ring 4 is 0.8 microns, and the overall performance of the sealing device 3 is improved; a plurality of annular oil grooves 12 are formed in the outer surface of the copper powder filled polytetrafluoroethylene ring 5, the annular oil grooves 12 are equidistantly distributed on the outer surface of the copper powder filled polytetrafluoroethylene ring 5, and the distance between the plurality of annular oil grooves 12 is 20 mm; when pressure oil in the cylinder body 2 flows into the annular oil groove 12, the copper powder filled on the outer surface of the polytetrafluoroethylene ring 5 is tightly attached to the inner wall of the cylinder body 2 under the action of the oil pressure; the inner surface of the copper powder filled polytetrafluoroethylene ring 5 is provided with a hot-assembly binding surface 13, the roughness of the hot-assembly binding surface 13 is 6.3 microns, the outer surface of the copper powder filled polytetrafluoroethylene ring 5 is provided with a movable sealing binding surface 14, the movable sealing binding surface 14 comprises an upper movable sealing binding surface 15, a lower movable sealing binding surface 16 and a middle guide surface 17, the diameter of the upper movable sealing binding surface 15 is larger than the inner diameter of the cylinder body 2, the difference value is 0.5, the inner diameter of the lower movable sealing binding surface 16 is larger than the diameter of the cylinder body 2, the difference value is 0.5, and the diameter of the middle guide surface 17 is smaller than the inner diameter of the cylinder body 2, and the difference value is 0.05; the roughness of the hot-fit binding surface 13 is 6.3um, so that the copper powder filled polytetrafluoroethylene ring 5 is tightly attached to the metal ring 4; when the pressure oil in the cylinder body 2 flows into the dynamic sealing joint surface 14, the dynamic sealing joint surface 14 is tightly attached to the inner wall of the cylinder body 2 under the action of the oil pressure because the diameter of the dynamic sealing joint surface 14 is different from that of the cylinder body 2, so that the overall performance of the sealing device 3 is improved; a first inclined plane 18 is arranged on one surface, away from the side wall of the inner cavity of the cylinder body 2, of the upper movable sealing attaching surface 15, a second inclined plane 19 is arranged on one surface, away from the side wall of the inner cavity of the cylinder body 2, of the lower movable sealing attaching surface 16, an included angle a is formed between the first inclined plane 18 and the piston 1, an included angle b is formed between the second inclined plane 19 and the compression nut 6, and both the angle a and the angle b are 0.5 degrees; when the piston 1 moves, when pressure oil flows into the included angle a and the included angle b, the upper dynamic seal joint surface 15 and the lower dynamic seal joint surface 16 are tightly attached to the inner wall of the cylinder body 2 under the action of oil pressure; an upper inner cavity 20 is arranged between the first inclined surface 18 and the piston 1, and a lower inner cavity 21 is arranged between the second inclined surface 19 and the compression nut 6; the upper inner cavity 20 is an included angle area between the first inclined surface 18 and the piston 1, the lower inner cavity 21 is an included angle area between the second inclined surface 19 and the compression nut 6, and when pressure oil flows into the upper inner cavity 20 and the lower inner cavity 21, the upper dynamic sealing joint surface 15 and the lower dynamic sealing joint surface 16 can be tightly attached to the inner wall of the cylinder body 2 under the action of oil pressure; the metal ring 4 is made of 42 chromium molybdenum steel; the 42 chromium molybdenum steel has high strength and toughness, good low-temperature impact toughness and deformation resistance, and prolongs the service life of the sealing device 3.
A sealing method of an integrated sealing device for a piston comprises the following steps:
s1, sleeving the O-shaped sealing ring 8 in the first groove 7;
s2, sleeving the metal ring 4 on the outer side of the lower part of the piston 1 provided with the O-shaped sealing ring 8;
s3, heating copper powder to fill the polytetrafluoroethylene ring 5; then sleeving the heated copper powder filled polytetrafluoroethylene ring 5 on the outer side of the metal ring 4; in the process that the hot-loading copper powder filled polytetrafluoroethylene ring 5 is arranged on the outer side of the metal ring 4, the hot-loading binding surface 13 of the copper powder filled polytetrafluoroethylene ring 5 is tightly attached to the metal ring 4, the heating temperature is 165 ℃, and the heating time is 55 minutes.
Example 11 of the invention: an integrated sealing device for a piston comprises a piston 1, a cylinder body 2 and a sealing device 3, wherein the piston 1 is arranged in an inner cavity of the cylinder body 2, the sealing device 3 comprises a metal ring 4 and a copper powder filled polytetrafluoroethylene ring 5 which are sequentially arranged from inside to outside, a compression nut 6 is arranged below the sealing device 3, the compression nut 6 is in threaded connection with the bottom of the piston 1, the metal ring 4 is arranged on the outer side of the lower portion of the piston 1, the copper powder filled polytetrafluoroethylene ring 5 is hot-mounted on the outer side of the metal ring 4, the interference between the copper powder filled polytetrafluoroethylene ring 5 and the metal ring 4 is 10mm, and the outer wall of the copper powder filled polytetrafluoroethylene ring 5 is attached to the side wall of the inner cavity of the cylinder body 2; the polytetrafluoroethylene ring 5 filled with the copper powder effectively improves the abrasion resistance and self-lubrication of the seal, the anti-deformation capacity of the integrated sealing device 3 is improved due to the use of the metal ring 4, the service life of the sealing device 3 is prolonged, the compression nut 6 is in threaded connection with the bottom of the piston 1 to compress the sealing device 3, and the overall sealing performance of the sealing device 3 is improved; a first groove 7 is formed between the piston 1 and the metal ring 4, and an O-shaped sealing ring 8 is arranged on the inner surface of the first groove 7; the O-shaped sealing ring 8 is used for static sealing, so that the overall performance of the sealing device 3 is improved; a rod cavity 9 is arranged between the side wall of the piston 1 and the inner cavity of the cylinder body 2, and a rodless cavity 10 is arranged between the bottom of the piston 1 and the inner cavity of the cylinder body 2; the rod cavity 9 and the rodless cavity 10 are used for storing pressure oil, and when the piston 1 moves, the pressure difference in the cylinder body 2 is changed under the action of the oil pressure; the outer surface of the metal ring 4 is provided with a plurality of second grooves 11, the second grooves 11 are equidistantly distributed on the outer surface of the metal ring 4, the distance between the second grooves 11 is 10mm, the roughness of the outer surface of the metal ring 4 is 12.5um, and the roughness of the inner surface of the metal ring 4 is 0.8 um; air in the second groove 11 can be exhausted due to the rise of heat in the hot charging process, a negative pressure region can be formed in the second groove 11 after the hot charging, so that the copper powder filled polytetrafluoroethylene ring 5 is tightly attached to the metal ring 4, the roughness of the outer surface of the metal ring 4 is 12.5 microns, the roughness of the inner surface of the metal ring 4 is 0.8 microns, and the overall performance of the sealing device 3 is improved; a plurality of annular oil grooves 12 are formed in the outer surface of the copper powder filled polytetrafluoroethylene ring 5, the annular oil grooves 12 are equidistantly distributed on the outer surface of the copper powder filled polytetrafluoroethylene ring 5, and the distance between the plurality of annular oil grooves 12 is 20 mm; when pressure oil in the cylinder body 2 flows into the annular oil groove 12, the copper powder filled on the outer surface of the polytetrafluoroethylene ring 5 is tightly attached to the inner wall of the cylinder body 2 under the action of the oil pressure; the inner surface of the copper powder filled polytetrafluoroethylene ring 5 is provided with a hot-assembly binding surface 13, the roughness of the hot-assembly binding surface 13 is 6.3 microns, the outer surface of the copper powder filled polytetrafluoroethylene ring 5 is provided with a movable sealing binding surface 14, the movable sealing binding surface 14 comprises an upper movable sealing binding surface 15, a lower movable sealing binding surface 16 and a middle guide surface 17, the diameter of the upper movable sealing binding surface 15 is larger than the inner diameter of the cylinder body 2, the difference value is 0.55mm, the inner diameter of the lower movable sealing binding surface 16 is larger than the diameter of the cylinder body 2, the difference value is 0.55mm, the diameter of the middle guide surface 17 is smaller than the inner diameter of the cylinder body 2, and the difference value is 0.1 mm; the roughness of the hot-fit binding surface 13 is 6.3um, so that the copper powder filled polytetrafluoroethylene ring 5 is tightly attached to the metal ring 4; when the pressure oil in the cylinder body 2 flows into the dynamic sealing joint surface 14, the dynamic sealing joint surface 14 is tightly attached to the inner wall of the cylinder body 2 under the action of the oil pressure because the diameter of the dynamic sealing joint surface 14 is different from that of the cylinder body 2, so that the overall performance of the sealing device 3 is improved; a first inclined plane 18 is arranged on one surface, away from the side wall of the inner cavity of the cylinder body 2, of the upper movable sealing attaching surface 15, a second inclined plane 19 is arranged on one surface, away from the side wall of the inner cavity of the cylinder body 2, of the lower movable sealing attaching surface 16, an included angle a is formed between the first inclined plane 18 and the piston 1, an included angle b is formed between the second inclined plane 19 and the compression nut 6, and both the angle a and the angle b are 0.5 degrees; when the piston 1 moves, when pressure oil flows into the included angle a and the included angle b, the upper dynamic seal joint surface 15 and the lower dynamic seal joint surface 16 are tightly attached to the inner wall of the cylinder body 2 under the action of oil pressure; an upper inner cavity 20 is arranged between the first inclined surface 18 and the piston 1, and a lower inner cavity 21 is arranged between the second inclined surface 19 and the compression nut 6; the upper inner cavity 20 is an included angle area between the first inclined surface 18 and the piston 1, the lower inner cavity 21 is an included angle area between the second inclined surface 19 and the compression nut 6, and when pressure oil flows into the upper inner cavity 20 and the lower inner cavity 21, the upper movable sealing joint surface 15 and the lower movable sealing joint surface 16 can be tightly attached to the inner wall of the cylinder body 2 under the action of oil pressure; the metal ring 4 is made of 42 chromium molybdenum steel; the 42 chromium molybdenum steel has high strength and toughness, good low-temperature impact toughness and deformation resistance, and prolongs the service life of the sealing device 3.
A sealing method of an integrated sealing device for a piston comprises the following steps:
s1, sleeving the O-shaped sealing ring 8 in the first groove 7;
s2, sleeving the metal ring 4 on the outer side of the lower part of the piston 1 provided with the O-shaped sealing ring 8;
s3, heating copper powder to fill the polytetrafluoroethylene ring 5; then sleeving the heated copper powder filled polytetrafluoroethylene ring 5 on the outer side of the metal ring 4; in the process that the hot-loading copper powder is filled in the polytetrafluoroethylene ring 5 and is arranged on the outer side of the metal ring 4, the hot-loading binding surface 13 of the copper powder filled polytetrafluoroethylene ring 5 is tightly attached to the metal ring 4, the heating temperature is 170 ℃, and the heating time is 50 minutes.
Example 12 of the present invention: an integrated sealing device for a piston comprises a piston 1, a cylinder body 2 and a sealing device 3, wherein the piston 1 is arranged in an inner cavity of the cylinder body 2, the sealing device 3 comprises a metal ring 4 and a copper powder filled polytetrafluoroethylene ring 5 which are sequentially arranged from inside to outside, a compression nut 6 is arranged below the sealing device 3, the compression nut 6 is in threaded connection with the bottom of the piston 1, the metal ring 4 is arranged on the outer side of the lower portion of the piston 1, the copper powder filled polytetrafluoroethylene ring 5 is hot-mounted on the outer side of the metal ring 4, the interference between the copper powder filled polytetrafluoroethylene ring 5 and the metal ring 4 is 10mm, and the outer wall of the copper powder filled polytetrafluoroethylene ring 5 is attached to the side wall of the inner cavity of the cylinder body 2; the polytetrafluoroethylene ring 5 filled with the copper powder effectively improves the abrasion resistance and self-lubrication of the seal, the anti-deformation capacity of the integrated sealing device 3 is improved due to the use of the metal ring 4, the service life of the sealing device 3 is prolonged, the compression nut 6 is in threaded connection with the bottom of the piston 1 to compress the sealing device 3, and the overall sealing performance of the sealing device 3 is improved; a first groove 7 is formed between the piston 1 and the metal ring 4, and an O-shaped sealing ring 8 is arranged on the inner surface of the first groove 7; the O-shaped sealing ring 8 is used for static sealing, so that the overall performance of the sealing device 3 is improved; a rod cavity 9 is arranged between the side wall of the piston 1 and the inner cavity of the cylinder body 2, and a rodless cavity 10 is arranged between the bottom of the piston 1 and the inner cavity of the cylinder body 2; the rod cavity 9 and the rodless cavity 10 are used for storing pressure oil, and when the piston 1 moves, the pressure difference in the cylinder body 2 is changed under the action of the oil pressure; the outer surface of the metal ring 4 is provided with a plurality of second grooves 11, the second grooves 11 are equidistantly distributed on the outer surface of the metal ring 4, the distance between the second grooves 11 is 10mm, the roughness of the outer surface of the metal ring 4 is 12.5um, and the roughness of the inner surface of the metal ring 4 is 0.8 um; air in the second groove 11 can be exhausted due to the rise of heat in the hot charging process, a negative pressure region can be formed in the second groove 11 after the hot charging, so that the copper powder filled polytetrafluoroethylene ring 5 is tightly attached to the metal ring 4, the roughness of the outer surface of the metal ring 4 is 12.5 microns, the roughness of the inner surface of the metal ring 4 is 0.8 microns, and the overall performance of the sealing device 3 is improved; a plurality of annular oil grooves 12 are formed in the outer surface of the copper powder filled polytetrafluoroethylene ring 5, the annular oil grooves 12 are equidistantly distributed on the outer surface of the copper powder filled polytetrafluoroethylene ring 5, and the distance between the plurality of annular oil grooves 12 is 20 mm; when pressure oil in the cylinder body 2 flows into the annular oil groove 12, the copper powder filled on the outer surface of the polytetrafluoroethylene ring 5 is tightly attached to the inner wall of the cylinder body 2 under the action of the oil pressure; the inner surface of the copper powder filled polytetrafluoroethylene ring 5 is provided with a hot-assembly binding surface 13, the roughness of the hot-assembly binding surface 13 is 6.3 microns, the outer surface of the copper powder filled polytetrafluoroethylene ring 5 is provided with a movable sealing binding surface 14, the movable sealing binding surface 14 comprises an upper movable sealing binding surface 15, a lower movable sealing binding surface 16 and a middle guide surface 17, the diameter of the upper movable sealing binding surface 15 is larger than the inner diameter of the cylinder body 2, the difference value is 0.5-0.55mm, the inner diameter of the lower movable sealing binding surface 16 is larger than the diameter of the cylinder body 2, the difference value is 0.5-0.55mm, and the diameter of the middle guide surface 17 is smaller than the inner diameter of the cylinder body 2, and the difference value is 0.05-0.1 mm; the roughness of the hot-fit binding surface 13 is 6.3um, so that the copper powder filled polytetrafluoroethylene ring 5 is tightly attached to the metal ring 4; when the pressure oil in the cylinder body 2 flows into the dynamic sealing joint surface 14, the dynamic sealing joint surface 14 is tightly attached to the inner wall of the cylinder body 2 under the action of the oil pressure because the diameter of the dynamic sealing joint surface 14 is different from that of the cylinder body 2, so that the overall performance of the sealing device 3 is improved; a first inclined plane 18 is arranged on one surface, away from the side wall of the inner cavity of the cylinder body 2, of the upper movable sealing attaching surface 15, a second inclined plane 19 is arranged on one surface, away from the side wall of the inner cavity of the cylinder body 2, of the lower movable sealing attaching surface 16, an included angle a is formed between the first inclined plane 18 and the piston 1, an included angle b is formed between the second inclined plane 19 and the compression nut 6, and both the angle a and the angle b are 0.5 degrees; when the piston 1 moves, when pressure oil flows into the included angle a and the included angle b, the upper dynamic seal joint surface 15 and the lower dynamic seal joint surface 16 are tightly attached to the inner wall of the cylinder body 2 under the action of oil pressure; an upper inner cavity 20 is arranged between the first inclined surface 18 and the piston 1, and a lower inner cavity 21 is arranged between the second inclined surface 19 and the compression nut 6; the upper inner cavity 20 is an included angle area between the first inclined surface 18 and the piston 1, the lower inner cavity 21 is an included angle area between the second inclined surface 19 and the compression nut 6, and when pressure oil flows into the upper inner cavity 20 and the lower inner cavity 21, the upper dynamic sealing joint surface 15 and the lower dynamic sealing joint surface 16 can be tightly attached to the inner wall of the cylinder body 2 under the action of oil pressure; the metal ring 4 is made of 42 chromium molybdenum steel; the 42 chromium molybdenum steel has high strength and toughness, good low-temperature impact toughness and deformation resistance, and prolongs the service life of the sealing device 3.
A sealing method of an integrated sealing device for a piston comprises the following steps:
s1, sleeving the O-shaped sealing ring 8 in the first groove 7;
s2, sleeving the metal ring 4 on the outer side of the lower part of the piston 1 provided with the O-shaped sealing ring 8;
s3, heating copper powder to fill the polytetrafluoroethylene ring 5; then sleeving the heated copper powder filled polytetrafluoroethylene ring 5 on the outer side of the metal ring 4; in the process that the hot-loading copper powder is filled in the polytetrafluoroethylene ring 5 and is arranged on the outer side of the metal ring 4, the hot-loading binding surface 13 of the copper powder filled polytetrafluoroethylene ring 5 is tightly attached to the metal ring 4, the heating temperature is 175 ℃, and the heating time is 45 minutes.
The working principle of one embodiment of the invention is as follows: the piston 1 is arranged in an inner cavity of the cylinder body 2, the sealing device 3 comprises a metal ring 4 and a copper powder filled polytetrafluoroethylene ring 5 which are sequentially arranged from inside to outside, and the outer wall of the copper powder filled polytetrafluoroethylene ring 5 is attached to the side wall of the inner cavity of the cylinder body 2; when the piston 1 works, pressure oil is arranged in the rod cavity 9, the pressure oil flows into the upper inner cavity 20, and the upper dynamic seal joint surface 15 is tightly attached to the inner wall of the cylinder body 2 under the action of the oil pressure; the rodless cavity 10 of the hydraulic cylinder is provided with pressure oil, the pressure oil flows into the lower inner cavity 21, the lower dynamic seal joint surface 16 is tightly attached to the inner wall of the cylinder body 2 under the action of the pressure oil, and the overall performance of the sealing device is improved.

Claims (10)

1. An integrated sealing device for a piston is characterized by comprising a piston (1), a cylinder body (2) and a sealing device (3), the piston (1) is arranged in the inner cavity of the cylinder body (2), the sealing device (3) comprises a metal ring (4) and a copper powder filled polytetrafluoroethylene ring (5) which are sequentially arranged from inside to outside, a compression nut (6) is arranged below the sealing device (3), the compression nut (6) is connected with the bottom of the piston (1) by screw thread, the piston is characterized in that the metal ring (4) is arranged on the outer side of the lower portion of the piston (1), the copper powder filled polytetrafluoroethylene ring (5) is hot-assembled on the outer side of the metal ring (4), the interference magnitude between the copper powder filled polytetrafluoroethylene ring (5) and the metal ring (4) is 10mm, and the outer wall of the copper powder filled polytetrafluoroethylene ring (5) is attached to the side wall of the inner cavity of the cylinder body (2).
2. An integrated sealing device for a piston as claimed in claim 1, characterized in that a first groove (7) is provided between the piston (1) and the metal ring (4), and an O-ring (8) is provided on the inner surface of the first groove (7).
3. An integrated sealing device for a piston as claimed in claim 1, characterized in that a rod chamber (9) is provided between the side wall of the piston (1) and the inner chamber of the cylinder (2), and a rodless chamber (10) is provided between the bottom of the piston (1) and the inner chamber of the cylinder (2).
4. An integrated sealing device for a piston as claimed in claim 1, wherein the outer surface of the metal ring (4) is provided with a plurality of second grooves (11), the second grooves (11) are equidistantly distributed on the outer surface of the metal ring (4), the distance between the plurality of second grooves (11) is 10mm, the roughness of the outer surface of the metal ring (4) is 12.5um, and the roughness of the inner surface of the metal ring (4) is 0.8 um.
5. The integrated sealing device for the piston as claimed in claim 1, wherein the outer surface of the copper powder filled polytetrafluoroethylene ring (5) is provided with a plurality of annular oil grooves (12), the annular oil grooves (12) are equidistantly distributed on the outer surface of the copper powder filled polytetrafluoroethylene ring (5), and the distance between the plurality of annular oil grooves (12) is 20 mm.
6. An integrated sealing device for a piston according to claim 1, the inner surface of the copper powder filled polytetrafluoroethylene ring (5) is provided with a hot-fitting binding surface (13), the roughness of the hot-fitting binding surface (13) is 6.3um, the outer surface of the copper powder filled polytetrafluoroethylene ring (5) is provided with a dynamic sealing binding surface (14), the dynamic sealing joint surface (14) comprises an upper dynamic sealing joint surface (15), a lower dynamic sealing joint surface (16) and a middle guide surface (17), the diameter of the upper dynamic sealing joint surface (15) is larger than the inner diameter of the cylinder body (2) and the difference value is 0.5-0.55mm, the inner diameter of the lower dynamic sealing joint surface (16) is larger than the diameter of the cylinder body (2) and the difference value is 0.5-0.55mm, the diameter of the middle guide surface (17) is smaller than the inner diameter of the cylinder body (2) and the difference is 0.05-0.1 mm.
7. The integrated sealing device for the piston as claimed in claim 6, wherein a first inclined surface (18) is arranged on the surface of the upper movable sealing joint surface (15) far away from the side wall of the inner cavity of the cylinder body (2), a second inclined surface (19) is arranged on the surface of the lower movable sealing joint surface (16) far away from the side wall of the inner cavity of the cylinder body (2), an included angle a is arranged between the first inclined surface (18) and the piston (1), an included angle b is arranged between the second inclined surface (19) and the gland nut (6), and a and b are both 0.5 °.
8. An integrated sealing device for a piston according to claim 7, characterized in that an upper inner cavity (20) is arranged between the first inclined surface (18) and the piston (1), and a lower inner cavity (21) is arranged between the second inclined surface (19) and the compression nut (6).
9. An integrated sealing device for a piston according to claim 1, characterized in that the material of the metal ring (4) is 42 chrome molybdenum steel.
10. A sealing method of an integrated sealing device for a piston is characterized by comprising the following steps:
s1, sleeving the O-shaped sealing ring (8) in the first groove (7);
s2, sleeving a metal ring (4) on the outer side of the lower part of the piston (1) provided with the O-shaped sealing ring (8);
s3, heating copper powder to fill the polytetrafluoroethylene ring (5); then sleeving the heated copper powder filled polytetrafluoroethylene ring (5) on the outer side of the metal ring (4); in the process that the copper powder filled polytetrafluoroethylene ring (5) is arranged on the outer side of the metal ring (4), the hot-loading binding surface (13) of the copper powder filled polytetrafluoroethylene ring (5) is tightly attached to the metal ring (4), the heating temperature is 165-175 ℃, and the heating time is 45-55 minutes.
CN202010916157.4A 2020-09-03 2020-09-03 Integrated sealing device for piston and sealing method thereof Pending CN112012980A (en)

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CN202010916157.4A CN112012980A (en) 2020-09-03 2020-09-03 Integrated sealing device for piston and sealing method thereof

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Application Number Priority Date Filing Date Title
CN202010916157.4A CN112012980A (en) 2020-09-03 2020-09-03 Integrated sealing device for piston and sealing method thereof

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CN209370297U (en) * 2018-09-27 2019-09-10 中浙高铁轴承有限公司 A kind of deep groove ball bearing seal assembly
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GB388945A (en) * 1932-04-08 1933-03-09 American Trust Company Improvements in or relating to piston and ring assemblies and to packing rings therefor
JPH1162829A (en) * 1997-08-28 1999-03-05 Sanyo Electric Co Ltd Boosting supply device
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