CN112780635A - Double sealing device for oil cylinder of hydraulic oil pumping unit - Google Patents

Double sealing device for oil cylinder of hydraulic oil pumping unit Download PDF

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Publication number
CN112780635A
CN112780635A CN202110288976.3A CN202110288976A CN112780635A CN 112780635 A CN112780635 A CN 112780635A CN 202110288976 A CN202110288976 A CN 202110288976A CN 112780635 A CN112780635 A CN 112780635A
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CN
China
Prior art keywords
oil
flange
cylinder
piston rod
rod
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
Application number
CN202110288976.3A
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Chinese (zh)
Inventor
曹健
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chinatech Petroleum Technology Chengdu Co Ltd
Original Assignee
Chinatech Petroleum Technology Chengdu Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Chinatech Petroleum Technology Chengdu Co Ltd filed Critical Chinatech Petroleum Technology Chengdu Co Ltd
Priority to CN202110288976.3A priority Critical patent/CN112780635A/en
Publication of CN112780635A publication Critical patent/CN112780635A/en
Pending legal-status Critical Current

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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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
    • E21B43/121—Lifting well fluids
    • 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
    • F15B15/1438—Cylinder to end cap assemblies
    • F15B15/1442—End cap 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
    • 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
    • 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
    • F15B15/1457—Piston rods
    • F15B15/1461—Piston rod 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
    • 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
    • F15B15/1476—Special return means
    • 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
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members

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  • Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Actuator (AREA)

Abstract

The utility model provides a double sealing device of hydraulic pressure beam-pumping unit hydro-cylinder, relate to the hydro-cylinder field for the hydraulic pressure beam-pumping unit, the cylinder passes through bolt and flange joint, flange opposite side and oil well flange joint, piston and piston rod are equipped with in the cylinder, piston rod one end rod end connecting thread is connected with the oil well sucker rod, displacement sensor arranges inside hollow piston rod in, displacement sensor has put the data line in the end, displacement signal spreads through the data line, be provided with the sealed combination of flange between flange and piston rod, be provided with the sealed combination of rod end between cylinder lower extreme and piston rod, there is the oil storage chamber between the sealed and flange of rod end. Through the sealed double seal with flange seal of rod end, improved the sealed effect and the life of hydro-cylinder. Establish oil storage tank and oil drain port between the rod end is sealed and the flange is sealed, can pour into lubricating grease into to the oil storage tank through the oil drain port, improve the lubrication and sealed of piston rod, also can make the oil flow of revealing return hydraulic system's oil tank, accessible filtration realizes retrieving and recycles.

Description

Double sealing device for oil cylinder of hydraulic oil pumping unit
Technical Field
The invention relates to the field of oil cylinders for hydraulic oil pumping machines, in particular to a double-sealing device for an oil cylinder of a hydraulic oil pumping machine.
Background
The oil cylinder for the hydraulic oil pumping machine directly installed on a well head at present has short service life, and the hydraulic oil leaks to pollute the environment. Meanwhile, the oil cylinder flange is directly connected with the wellhead flange, so that underground high-pressure oil can directly contact with the lower seal of the oil cylinder, the oil can gradually corrode a sealing system and pollute hydraulic oil in the oil cylinder, the sealing of the oil cylinder is invalid, the service lives of the oil cylinder and the hydraulic oil are shortened, and therefore frequent shut-down and repair of the oil cylinder and replacement of the hydraulic oil are needed, the cost is increased, and the yield of an oil well is influenced.
Disclosure of Invention
The invention aims to solve the problems of sealing of the oil cylinder for the hydraulic oil pumping unit and recycling of leaked oil and improve the fault-free service cycle of the hydraulic oil cylinder.
The technical scheme of the invention is as follows: a double sealing device of a hydraulic oil pumping machine oil cylinder comprises a piston rod connecting thread, a sealing gland, an oil sealing groove, a flange, an oil discharge port, a rod end sealing combination, an oil guide hole, a piston rod, a displacement sensor, a cylinder barrel, a data line, an installation lifting lug, a piston sealing combination, a piston, an oil inlet, an oil storage cavity, a flange sealing combination and a dustproof oil baffle ring, wherein the cylinder barrel is connected with the flange through bolts, the other side of the flange is connected with an oil well flange, the piston is arranged in the cylinder barrel and is fixedly connected with one end of the piston rod, the other end of the piston rod is provided with a rod end connecting thread, the piston rod penetrates through the flange to enter the oil well, the rod end connecting thread is connected with an oil well sucker rod, the piston rod is of a hollow structure, the displacement sensor is arranged, the cylinder barrel and the piston rod are provided with a rod end seal assembly, an oil storage cavity is arranged between the rod end seal and the flange seal, an oil discharge port is arranged on the flange, and the hydraulic oil and the oil which are leaked in a trace amount are stored in the oil storage cavity and flow back to the oil tank through the oil discharge port to be reused after being filtered.
And a piston seal assembly is arranged between the piston and the cylinder barrel.
The cylinder barrel is provided with a drainage hole which is communicated with an annular cavity formed by sealing and combining the rod end.
The cylinder barrel is provided with an oil inlet.
And lifting lugs are welded on two sides of the cylinder barrel and used for installation and disassembly.
And an oil discharge port is arranged on the flange.
And the flange is provided with an oil sealing groove.
And the bottom of the flange is provided with a dustproof oil baffle ring which is fixed through a gland.
The rod end connecting thread is used for being connected with an oil well sucker rod, and the flange is used for being connected with an oil well flange. The seal groove is used for sealing the oil well.
And the micro-leakage hydraulic oil and petroleum are stored in the oil storage cavity, flow back to the oil tank through the oil discharge port and are reused after being filtered.
The lifting lug is used for the installation and the dismantlement of hydro-cylinder. The lifting lug and the upper end cover of the cylinder barrel are welded into a whole.
The oil is led to lead the hydraulic oil into the main seal of the rod end seal combination, so that the main seal is subjected to radial pressure, and the sealing performance is improved.
The moving distance of the oil cylinder piston is accurately controlled by a displacement sensor arranged in the hollow piston rod. The seal of the piston of the oil cylinder is sealed by the piston seal combination, the seal of the piston rod is sealed by the rod end seal combination, the working hydraulic oil in the oil cylinder enters the annular cavity of the rod end main seal through the oil guide hole, and radial pressure is formed on the main seal (the radial pressure depends on the sectional area of the annular cavity of the main seal and the working pressure of the oil cylinder), so that the main seal is tightly attached to the lever, and the sealing performance is ensured. The diameter of the drainage hole is as small as possible, and the diameter is 0-2mm, preferably 1.5mm, in order to reduce the processing cost. The effect of drainage hole is for providing radial packing force for the sealing washer to improve the sealed effect of sealing washer. The sealing ring of the common oil cylinder provides radial pressing force by the elasticity of the sealing ring, oil leakage begins to occur after the elasticity is reduced along with the abrasion and the aging of the sealing ring, generally occurs after the oil cylinder works for half a year, after the structure is used, the abraded and aged sealing ring can still play a sealing role under the action of oil pressure, and the service life of the sealing ring can be prolonged by 1 time. If the diameter of the drainage hole is too large, the safety of the sealing ring can be influenced.
The well mouth oil is sealed by the flange sealing combination on the flange. An oil storage cavity is arranged between the rod end seal and the flange seal, trace leakage can be stored in the oil storage cavity, and flows back to a hydraulic system through an oil discharge hole, and the oil is discharged into an oil tank for reuse after being filtered.
The invention has the beneficial technical effects that: working hydraulic oil in the oil cylinder enters the annular cavity of the main seal of the rod end through the oil guide hole to form radial pressure on the main seal, and the radial pressure depends on the sectional area of the annular cavity of the main seal and the working pressure of the oil cylinder, so that the main seal is tightly attached to the lever, and the sealing performance is ensured. Through the sealed double seal with flange seal of rod end, improved the sealed effect and the life of hydro-cylinder. Meanwhile, an oil storage tank and an oil discharge port are arranged between the rod end seal and the flange seal, so that leaked oil can flow back to an oil tank of the hydraulic system. Can be recycled by filtration.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The present application will now be described more fully hereinafter with reference to the accompanying drawings, in which all other embodiments of the invention can be made without inventive faculty, and which are within the scope of the invention.
Example 1
A double sealing device of a hydraulic oil pumping machine oil cylinder comprises a piston rod connecting thread 1, a sealing gland 2, an oil sealing groove 3, a flange 4, an oil outlet 5, a rod end sealing combination 6, an oil leading hole 7, a piston rod 8, a displacement sensor 9, a cylinder barrel 10, a data line 11, a piston sealing combination 13, a piston 14, an oil inlet 15, a flange sealing combination 17 and a dustproof oil baffle ring 18, wherein the cylinder barrel 10 is connected with the flange 4 through a bolt, the other side of the flange 4 is connected with an oil well flange, the piston 14 is arranged in the cylinder barrel 10, the piston 14 is fixedly connected with one end of the piston rod 8, the other end of the piston rod 8 is provided with the rod end connecting thread 1, the piston rod 8 penetrates through the flange 4 to enter the oil well, the rod end connecting thread 1 is connected with the oil well, the piston rod 8 is of a, the displacement signal is transmitted through a data line 11, a flange seal assembly 17 is arranged between the flange 4 and the piston rod 8, a rod end seal assembly 6 is arranged between the cylinder barrel 10 and the piston rod 8, an oil discharge port 5 is arranged on the flange 4, an oil storage cavity 16 is arranged between the rod end seal 6 and the flange seal 17, and a piston seal assembly 13 is arranged between the piston 14 and the cylinder barrel 10.
The cylinder barrel 10 is provided with an oil inlet 15.
The micro-leakage hydraulic oil and petroleum are stored in the oil storage cavity 16 and flow back to the oil tank through the oil discharge port 5, and are reused after being filtered. An oil storage tank and an oil discharge port are arranged between the rod end seal and the flange seal, so that leaked oil can flow back to an oil tank of the hydraulic system. Can be recycled by filtration.
Example 2
The other structures are the same as the embodiment 1, except that the lifting lugs 12 are welded on the two sides of the cylinder barrel 10 and used for mounting and dismounting the oil cylinder.
Example 3
The other structures are the same as those of embodiment 1 or embodiment 2, except that: the cylinder barrel 10 is provided with a drainage hole 7, and the drainage hole 7 is communicated with the annular cavity of the rod end sealing combination 6. The diameter of the drainage hole 7 should be as small as possible, and the diameter is 0-2mm, preferably 1.5mm, for reducing the processing cost. The drainage holes 7 are used for providing radial pressing force for the sealing ring so as to improve the sealing effect of the sealing ring. The sealing ring of the common oil cylinder provides radial pressing force by the elasticity of the sealing ring, oil leakage begins to occur after the elasticity is reduced along with the abrasion and the aging of the sealing ring, generally occurs after the oil cylinder works for half a year, after the structure is used, the abraded and aged sealing ring can still play a sealing role under the action of oil pressure, and the service life of the sealing ring can be prolonged by 1 time. If the diameter of the drainage hole is too large, the safety of the sealing ring can be influenced.
Example 4
The other structures are the same as the embodiments 1, 2 and 3, except that lubricating oil or lubricating grease is added into the oil storage chamber 16. The oil storage cavity can be filled with lubricating oil or lubricating grease, so that the rod end sealing ring is completely protected and works under the protection of the lubricating oil or the lubricating grease, and the problem of oxidation of the sealing ring is completely solved.
At present, because the rod end seal of a common oil cylinder of a well head is directly contacted with oil, the oil contains moisture and a small amount of S, and the S is an oxidant, the rod end seal can be quickly aged and loses elasticity. In this case, the oil cylinder will leak oil in half a year, and once the oil leakage begins, the oil cylinder will exceed the standard of the maximum leakage amount of 4 ml/min specified by the national standard. After the double-end seal is used, the petroleum is not directly contacted with the rod end sealing material, and the lubricating oil (grease) can be filled into the oil storage cavity between the two sections of seals, so that the rod end sealing ring is completely protected, the rod end sealing ring works under the protection of the lubricating oil (grease), and the problem of oxidation of the sealing ring is completely solved. The oil leakage prevention device can be used for preventing oil leakage for a year and a half, after the oil cylinder begins to leak, the oil discharge hole is arranged and connected with the oil discharge pipe, a small amount of leaked hydraulic oil can be discharged into an oil tank of a hydraulic system, the oil leakage prevention device is used after filtration, the external leakage of the oil cylinder is converted into internal leakage, and the service life of the oil cylinder is further prolonged. The novel oil cylinder can continuously work for more than 3 years, and the maintenance-free period of the oil cylinder is greatly prolonged.

Claims (8)

1. The utility model provides a double seal device of hydraulic oil pumping unit hydro-cylinder, includes piston rod connecting thread (1), gland (2), oil seal groove (3), flange (4), oil drain port (5), rod end seal group (6), draws oilhole (7), piston rod (8), displacement sensor (9), cylinder (10), data line (11), installation lug (12), piston seal group (13), piston (14), oil inlet (15), oil storage chamber (16), flange seal group (17), dustproof oil baffle ring (18), its characterized in that: the cylinder (10) is connected with the flange (4) through a bolt, the other side of the flange (4) is connected with an oil well flange, a piston (14) is arranged in the cylinder (10), the piston (14) is fixedly connected with one end of a piston rod (8), the other end of the piston rod (8) is provided with a rod end connecting thread (1), the piston rod (8) penetrates through the flange (4) to enter an oil well, the rod end connecting thread (1) is connected with an oil well sucker rod, the piston rod (8) is of a hollow structure, a displacement sensor (9) is arranged in the piston rod (8), a data line (11) is arranged at the upper end of the displacement sensor (9), a displacement signal is transmitted through the data line (11), a piston sealing combination (13) is arranged between the,
a flange seal assembly (17) is arranged between the flange (4) and the piston rod (8), a rod end seal assembly (6) is arranged between the cylinder barrel (10) and the piston rod (8), an oil storage cavity (16) is arranged between the rod end seal (6) and the flange seal (17), an oil discharge port (5) is arranged on the flange (4), and an oil inlet (15) is arranged on the cylinder barrel (10).
2. The double sealing device for the oil cylinder of the hydraulic oil pumping unit according to claim 1, wherein:
the cylinder barrel (10) is provided with a drainage hole (7), and the drainage hole (7) is communicated with the annular cavity of the rod end sealing combination (6).
3. The double sealing device for the oil cylinder of the hydraulic oil pumping unit according to claim 2, wherein:
the diameter of the drainage hole (7) is 0-2 mm.
4. The double sealing device for the oil cylinder of the hydraulic oil pumping unit according to claim 3, wherein:
the diameter of the drainage hole (7) is preferably 1.5 mm.
5. The double sealing device for the oil cylinder of the hydraulic oil pumping unit according to claim 1 or 2, wherein: and lifting lugs (12) are welded on two sides of the cylinder barrel (10) and are used for mounting the oil cylinder.
6. The double sealing device for the oil cylinder of the hydraulic oil pumping unit according to claim 1, wherein: and the flange (4) is provided with an oil sealing groove (3).
7. The double sealing device for the oil cylinder of the hydraulic oil pumping unit according to any one of claims 1 or 5, wherein: and a dustproof oil retaining ring (18) is installed at the bottom of the flange (4) and is fixed through a gland (2).
8. The double sealing device for the oil cylinder of the hydraulic oil pumping unit according to claim 1, wherein: lubricating oil or lubricating grease is added into the oil storage cavity (16).
CN202110288976.3A 2021-03-18 2021-03-18 Double sealing device for oil cylinder of hydraulic oil pumping unit Pending CN112780635A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110288976.3A CN112780635A (en) 2021-03-18 2021-03-18 Double sealing device for oil cylinder of hydraulic oil pumping unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110288976.3A CN112780635A (en) 2021-03-18 2021-03-18 Double sealing device for oil cylinder of hydraulic oil pumping unit

Publications (1)

Publication Number Publication Date
CN112780635A true CN112780635A (en) 2021-05-11

Family

ID=75762758

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110288976.3A Pending CN112780635A (en) 2021-03-18 2021-03-18 Double sealing device for oil cylinder of hydraulic oil pumping unit

Country Status (1)

Country Link
CN (1) CN112780635A (en)

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