CN214617286U - 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 PDFInfo
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- CN214617286U CN214617286U CN202120555322.8U CN202120555322U CN214617286U CN 214617286 U CN214617286 U CN 214617286U CN 202120555322 U CN202120555322 U CN 202120555322U CN 214617286 U CN214617286 U CN 214617286U
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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, be equipped with the oil drain port on the flange. 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
Technical Field
The utility model belongs to the technical field of a double sealing device that is used for hydro-cylinder for hydraulic pressure beam-pumping unit, especially a hydraulic pressure beam-pumping unit hydro-cylinder.
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.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem of the sealed recovery of leaking oil of hydro-cylinder for the hydraulic pumping unit, improving hydraulic cylinder's trouble-free life cycle.
The technical scheme of the utility model: 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, a 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 fixedly connected with one end of the piston rod, the other end of the piston rod is provided with a piston rod connecting thread, the piston rod penetrates through the flange to enter the oil well, the piston rod connecting thread is connected with an oil well pumping rod, the piston rod is of a hollow structure, the displacement sensor is arranged in the piston rod, the data line is arranged at the upper end of the displacement sensor, a displacement signal is transmitted out through the data line, and the flange sealing combination is arranged between the flange and the piston rod, the cylinder barrel and the piston rod are provided with a rod end sealing combination, an oil storage cavity is arranged between the rod end sealing combination and the flange sealing combination, an oil discharge port is arranged on the flange, and the trace leaked hydraulic oil and petroleum 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 an oil guiding hole, and the oil guiding hole 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 piston rod 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 oil guiding hole is preferably smaller, and the diameter is 0-2mm, preferably 1.5mm, in order to reduce the processing cost. The oil guiding hole is 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 oil guiding 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 sealing combination and the flange sealing combination, trace leakage can be stored in the oil storage cavity, and flows back to a hydraulic system through an oil discharge hole, and is discharged into an oil tank for reuse after being filtered.
The utility model has the advantages of: 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 double seal of the rod end seal combination and the flange seal combination, the sealing effect and the service life of the oil cylinder are improved. Meanwhile, an oil storage tank and an oil discharge port are arranged between the rod end sealing combination and the flange sealing combination, 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 diagram of the present invention.
Detailed Description
The present application will be described more fully and clearly with reference to the accompanying drawings, and all other embodiments that can be obtained by a person skilled in the art without any inventive step are intended to be included within the scope of the present 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 piston rod connecting thread 1, the piston rod 8 penetrates through the flange 4 to enter the oil well, the piston rod connecting thread 1 is connected with the oil well, the piston rod 8 is of a hollow structure, the displacement sensor 9 is arranged in the piston rod 8, the upper end of the displacement sensor 9 is provided with the data line 11, 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 assembly 6 and the flange seal assembly 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 combination, 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 an oil guiding hole 7, and the oil guiding hole 7 is communicated with an annular cavity of the rod end sealing assembly 6. The diameter of the oil guiding hole 7 should be as small as possible, and the diameter is 0-2mm, preferably 1.5mm, for reducing the processing cost. The oil guiding hole 7 is 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 oil guiding 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), 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 piston rod connecting thread (1), the piston rod (8) penetrates through the flange (4) to enter an oil well, the piston rod 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 piston (14) and the cylinder (10),
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 assembly (6) and the flange seal assembly (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 an oil guiding hole (7), and the oil guiding hole (7) is communicated with an 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 oil guiding 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 oil guiding hole (7) is 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 claim 1, wherein: and a dustproof oil baffle 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).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120555322.8U CN214617286U (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 |
|---|---|---|---|
| CN202120555322.8U CN214617286U (en) | 2021-03-18 | 2021-03-18 | Double sealing device for oil cylinder of hydraulic oil pumping unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214617286U true CN214617286U (en) | 2021-11-05 |
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ID=78394559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120555322.8U Active CN214617286U (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) | CN214617286U (en) |
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2021
- 2021-03-18 CN CN202120555322.8U patent/CN214617286U/en active Active
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