CN220909653U - Comprehensive sealing device for polished rod of oil pumping unit - Google Patents
Comprehensive sealing device for polished rod of oil pumping unit Download PDFInfo
- Publication number
- CN220909653U CN220909653U CN202420726252.1U CN202420726252U CN220909653U CN 220909653 U CN220909653 U CN 220909653U CN 202420726252 U CN202420726252 U CN 202420726252U CN 220909653 U CN220909653 U CN 220909653U
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- Prior art keywords
- air bag
- polished rod
- ball head
- rod
- sealing mechanism
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- 238000007789 sealing Methods 0.000 title claims abstract description 62
- 238000005086 pumping Methods 0.000 title claims abstract description 20
- 230000007246 mechanism Effects 0.000 claims abstract description 48
- 238000012856 packing Methods 0.000 claims abstract description 33
- 229920001971 elastomer Polymers 0.000 claims abstract description 21
- 239000010935 stainless steel Substances 0.000 claims abstract description 16
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 16
- 239000011253 protective coating Substances 0.000 claims abstract description 15
- 238000001125 extrusion Methods 0.000 claims abstract description 9
- 238000005507 spraying Methods 0.000 claims abstract description 5
- 238000010168 coupling process Methods 0.000 claims description 22
- 238000005859 coupling reaction Methods 0.000 claims description 22
- 230000008878 coupling Effects 0.000 claims description 21
- 238000003825 pressing Methods 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 5
- 229920001973 fluoroelastomer Polymers 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000010924 continuous production Methods 0.000 abstract description 2
- 238000000605 extraction Methods 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract description 2
- 239000003129 oil well Substances 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 25
- 239000010779 crude oil Substances 0.000 description 8
- 239000000126 substance Substances 0.000 description 4
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
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- Cleaning In General (AREA)
Abstract
The utility model relates to the technical field of oil extraction equipment, and discloses a comprehensive sealing device for a polished rod of an oil pumping unit, which comprises a polished rod, an oil receiving mechanism, a strong magnetic sealing mechanism, an air bag flexible sealing mechanism, a ball head extrusion packing sealing mechanism, a rubber micro-sealing mechanism and a centralizing mechanism, wherein the oil receiving mechanism, the strong magnetic sealing mechanism, the air bag flexible sealing mechanism, the ball head extrusion packing sealing mechanism, the rubber micro-sealing mechanism and the centralizing mechanism are sequentially arranged around the polished rod; the surface of the polished rod is provided with a stainless steel protective coating through spraying measures. The stainless steel protective coating arranged on the surface of the polish rod is wear-resistant and corrosion-resistant, so that the occurrence of the accident of breakage of the polish rod is effectively avoided; the multiple sealing effect is good, the sealing period is prolonged, and leakage is effectively prevented; the service life of the equipment is prolonged, the maintenance time and the cost of the equipment are saved, the normal continuous production of the oil well wellhead is ensured, and the method has considerable economic and social benefits.
Description
Technical Field
The utility model relates to the technical field of oil extraction equipment, in particular to a polish rod comprehensive sealing device of an oil pumping unit.
Background
At present, the polish rod sealer and polish rod of the pumping unit widely used in China have simple structure and single use function. The problems of displacement inclination, corrosion and the like of a wellhead polished rod can be caused frequently due to the influence of various reasons such as underground mine, well drilling, oil construction, installation and the difference of underground petroleum components during wellhead installation, dislocation of a sealer, the polished rod and the wellhead is caused, abrasion of the polished rod sealer and the polished rod and corrosion of the polished rod surface are accelerated, oil leakage pollution is caused, a shutdown accident is caused seriously, and huge economic loss is brought to oil field production.
Disclosure of utility model
In order to overcome the defects of the prior art, the utility model provides a comprehensive sealing device for a polished rod of an oil pumping unit.
The technical proposal is as follows: the device comprises a polished rod, an oil receiving mechanism, a strong magnetic sealing mechanism, an air bag flexible sealing mechanism, a ball head extrusion packing sealing mechanism, a rubber micro-sealing mechanism and a centralizing mechanism which are sequentially arranged around the polished rod; the surface of the polished rod is provided with a stainless steel protective coating through spraying measures, the top of the polished rod is a polished rod thread, and the bottom of the polished rod is a polished rod coupling; the oil receiving mechanism comprises an oil receiving shell and an oil receiving groove arranged in the center of the oil receiving shell; the strong magnetic sealing mechanism comprises a magnet box and a strong magnet arranged in the magnet box; the air bag flexible sealing mechanism comprises an air bag box, an air bag arranged in the box, an air charging connector connected with the air bag and penetrating through the side wall of the air bag box, an air charging connector fixing frame and an air charging connector protecting cap; the bulb extrusion packing sealing mechanism comprises a steering bulb, a packing pressing block, a packing, a bulb fastening sleeve and a bulb base, wherein the packing wraps a polished rod and fills the hollow inside the steering bulb; the rubber micro-sealing mechanism comprises a cylinder, a rubber, a push plate, a push rod and a handle, wherein the rubber and the push plate are positioned in a cavity of the cylinder, the rubber wraps the polished rod, the inner end and the outer end of the push rod are respectively connected with the push plate and the handle, and the upper part of the cylinder and the ball head base are fixed into a whole; the righting mechanism comprises a coupling and a righting block which is arranged inside the coupling and surrounds the polish rod, and the upper part of the coupling is fixedly integrated with the cylinder.
Further, the thickness of the stainless steel protective coating is up to 0.5 μm.
Furthermore, the stainless steel protective coating is made of 30CrMoA.
Further, the powerful magnet is hollow annular, and the polish rod penetrates through the powerful magnet.
Further, the air bag is hollow and circular, and the polish rod penetrates through the air bag; the inflation nozzle fixing frame comprises a front pipe and a rear pipe, the center of the front pipe passes through the inflation nozzle, the rear pipe is in threaded connection with the side wall of the air bag box through external threads, and the front pipe is in threaded connection with the inflation nozzle protecting cap through internal threads; the air charging nozzle protective cap is provided with an inner cavity for accommodating the end part of the air charging nozzle and is provided with external threads meshed with the internal threads of the front pipe at the periphery of the rear part; the outer periphery of the front tube of the air charging nozzle fixing frame and the outer periphery of the front part of the air charging nozzle protecting cap are respectively provided with an outer hexagon.
Further, the steering ball head is bulb-shaped.
Further, the oil receiving shell, the magnet box and the air bag box are fixed together through four fastening screws; the air bag box is connected with the upper part of the steering ball head, the ball head fastening sleeve is connected with the ball head base, and the coupling is connected with the centralizing block through threads.
Furthermore, the outer sides of the air bag box and the ball head fastening sleeve are respectively provided with a locking handle.
Furthermore, three sealing rings are arranged between the ball head base and the bottom of the steering ball head.
Furthermore, the ball head base is made of copper; the packing is made of fluororubber.
Compared with the prior art, the utility model has the following beneficial technical effects:
1. The stainless steel protective coating arranged on the surface of the polished rod is wear-resistant and corrosion-resistant, so that the service cycle of the polished rod can be prolonged, the occurrence of the accident of broken polished rod is avoided, and the shutdown is effectively avoided. The top on polished rod surface is the screw thread, the bottom on polished rod surface is the coupling, installs swiftly labour saving and time saving.
2. The gasbag is inflated through the charging connector and is embraced and sealed polished rod after making inner wall inflation, and fluororubber packing seals polished rod after passing through screw thread rotatory extrusion packing, combines rubber micro-seal, and multiple sealed is effectual, and seal cycle extension effectively prevents to alleviate the load of pump operation, the power saving is environmental protection.
3. The magnet can prevent the polished rod from being corroded and worn due to leakage of underground substances to the wellhead, and plays a role in prolonging the service life of the polished rod.
4. The packing is replaced periodically without emptying, so that the device is time-saving, labor-saving, convenient to adjust, safe, reliable and high in working efficiency.
5. The oil receiving groove effectively ensures that trace crude oil can not overflow to the ground along with the up and down running of the polish rod, thereby avoiding the pollution of wellhead environment and the ground caused by the trace crude oil.
6. Centralizing in real time, avoiding the displacement and inclination of the polish rod and ensuring the sealing effect.
7. The device can greatly prolong the service life of equipment after being installed and used, save the maintenance time and the cost of the equipment, ensure the normal continuous production of the oil well wellhead, have considerable economic and social benefits and have wide popularization prospect.
Drawings
FIG. 1 is a schematic diagram of the structural layout of the present utility model;
In the figure: 1-strong magnet, 2-air bag, 3-charging connector, 4-air bag box, 5-packing press block, 6-steering ball, 7-ball fastening sleeve, 8-ball base, 9-sealing ring, 10-handle, 11-cylinder, 12-push rod, 13-push plate, 14-coupling, 15-centralizing block, 16-polish rod, 17-stainless steel protective coating, 18-rubber, 19-packing, 20-locking handle, 21-magnet box, 22-fastening screw, 23-oil receiving groove, 24-oil receiving shell, 25-charging connector fixing frame, 26-charging connector protective cap, 27-polish rod thread and 28-polish rod coupling.
Detailed Description
The present utility model will be described in detail with reference to the accompanying drawings.
Example 1
See fig. 1. The comprehensive sealing device for the polished rod of the pumping unit comprises a polished rod 16, an oil receiving mechanism, a strong magnetic sealing mechanism, an air bag flexible sealing mechanism, a ball head extrusion packing sealing mechanism, a rubber micro-sealing mechanism and a centralizing mechanism which are sequentially arranged around the polished rod 16; the surface of the polish rod 16 is provided with a stainless steel protective coating 17 through spraying measures, the top of the polish rod 16 is provided with polish rod threads 27, and the bottom of the polish rod 16 is provided with polish rod couplings 28; the oil receiving mechanism comprises an oil receiving shell 24 and an oil receiving groove 23 arranged in the center of the oil receiving shell; the strong magnetic sealing mechanism comprises a magnet box 21 and a strong magnet 1 arranged in the magnet box; the air bag flexible sealing mechanism comprises an air bag box 4, an air bag 2 arranged in the box, an air charging connector 3 connected with the air bag 2 and penetrating through the side wall of the air bag box 4, an air charging connector fixing frame 25 and an air charging connector protecting cap 26; the bulb extrusion packing sealing mechanism comprises a steering bulb 6, a packing pressing block 5, a packing 19, a bulb fastening sleeve 7 and a bulb base 8, wherein the packing 19 wraps a polished rod 16 and fills the hollow inside the steering bulb 6, the packing pressing block 5 presses the top ends of the steering bulb 6 and the packing 19, the upper part of the steering bulb 6 and the packing pressing block 5 are buried in a central groove formed below the bottom wall of the airbag box 4, the bulb base 8 wraps the bottom of the steering bulb 6, and the bulb fastening sleeve 7 is respectively and tightly connected with the steering bulb 6 and the bulb base 8; the rubber micro-sealing mechanism comprises a cylinder 11, a rubber 18, a push plate 13, a push rod 12 and a handle 10, wherein the rubber 18 and the push plate 13 are positioned in a cavity of the cylinder 11, the rubber 18 wraps a polished rod 16, the inner end and the outer end of the push rod 12 are respectively connected with the push plate 13 and the handle 10, and the upper part of the cylinder 11 is fixedly integrated with a ball head base 8; the righting mechanism comprises a coupling 14 and a righting block 15 which is arranged inside the coupling and surrounds a polish rod 16, and the upper part of the coupling 14 is fixedly integrated with the cylinder 11.
Example 2
See fig. 1. On the basis of the technical scheme described in the embodiment 1, the thickness of the stainless steel protective coating 17 reaches 0.5 mu m; the stainless steel protective coating 17 is 30CrMoA. The surface of the polished rod 16 is formed into a compact stainless steel protective coating 17 by a spraying process, and then is subjected to multiple grinding and polishing treatments, so that the smoothness of the stainless steel protective coating 17 on the polished rod surface is similar to that of the stainless steel pipe surface. The 30CrMoA alloy structural steel is high-quality alloy structural steel, has excellent mechanical properties, wear resistance and corrosion resistance, and can meet the application requirements in various complex environments. The polish rod threads 27 and the polish rod coupling 28 can be quickly connected with equipment of a wellhead.
Example 3
See fig. 1. On the basis of the technical scheme described in the embodiment 1, the powerful magnet 1 is hollow and annular, and the polish rod 16 penetrates through the powerful magnet. The strong magnet 1 mainly has two functions: firstly, the powerful magnet 1 can prevent the polished rod 16 from being corroded and worn caused by leakage of black nonmetallic substances such as sulfur, acid and the like into a wellhead, and plays a role in prolonging the service life of the polished rod 16; secondly, the powerful magnet 1 can destroy the molecular weight of crude oil, so that the molecular weight of crude oil is reduced from large to small, and the effect of diluting the viscosity of crude oil is achieved.
Example 4
See fig. 1. On the basis of the technical scheme described in the embodiment 1, the air bag 2 is hollow and circular, and the polish rod 16 penetrates through the air bag; the air nozzle fixing frame 25 comprises a front pipe and a rear pipe, the center of the front pipe passes through the air nozzle 3, the rear pipe is in threaded connection with the side wall of the air bag box 4 through external threads, and the front pipe is in threaded connection with the air nozzle protecting cap 26 through internal threads; the charging connector protective cap 26 is provided with an inner cavity for accommodating the end part of the charging connector 3 and is provided with external threads meshed with the internal threads of the front pipe at the periphery of the rear part; outer hexagons are arranged on the periphery of the front tube of the air charging nozzle fixing frame 25 and the periphery of the front part of the air charging nozzle protecting cap 26, so that the assembly and disassembly operations are convenient. The air bag 2 is inflated by the inflation nozzle 3 in an electric and manual mode. The inner wall of the air bag 2 expands to encircle the polish rod 16 after being inflated to seal the polish rod, so as to form flexible seal and avoid hard friction between the polish rod 16 and other metal parts, thereby prolonging the service lives of the polish rod 16 and the packing 19 and realizing the purposes of yield increase, efficiency increase and consumption reduction.
Example 5
See fig. 1. On the basis of the technical scheme described in the embodiment 1, the steering ball head 6 is bulb-shaped, so that the upper and lower connection and the adjustment of the working state are convenient, the abrasion is reduced, and the efficiency is improved.
Example 6
See fig. 1. On the basis of the technical scheme described in the embodiment 1, the polish rod comprehensive sealing device of the oil pumping unit is characterized in that an oil receiving shell 24, a magnet box 21 and an air bag box 4 are fixed together through four fastening screws 22; the air bag box 4 is connected with the upper part of the steering ball head 6, the ball head fastening sleeve 7 is connected with the ball head base 8, and the coupling 14 is connected with the centralizing block 15 through threads; the outer sides of the air bag box 4 and the ball head fastening sleeve 7 are respectively provided with a locking handle 20 so as to facilitate operation. The connection mode of the screw and the threads ensures that the whole sealing device is subjected to follow-up deflection adjustment, and ensures that all connection parts of the whole sealing device are firm and reliable and safe to use.
Example 7
See fig. 1. On the basis of the technical scheme described in the embodiment 1, three sealing rings 9 are arranged between the ball head base 8 and the bottom of the steering ball head 6 to strengthen the sealing effect between the ball head base 8 and the steering ball head 6.
Example 8
See fig. 1. On the basis of the technical scheme described in the embodiment 1, the ball head base 8 is made of copper so as to exert good wear resistance, firmness, heat conductivity and corrosion resistance; the packing 19 is made of fluororubber material to exert good chemical stability, oil resistance and aging resistance.
The basic working principle of the utility model is briefly described as follows:
The polish rod comprehensive sealing device of the pumping unit is arranged at the upper end of a wellhead, a polish rod coupling 28 of the polish rod 16 is connected with a sucker rod in the well, and the coupling 14 is fixed through a clamp skin after being in butt joint with the wellhead. The function of the charging connector protective cap 26 is mainly that the comprehensive sealing device of the pumping unit can prevent the charging connector 3 from being damaged when colliding with other objects in the installation process. When a small amount of crude oil and gas mixture in the well is carried out by the ascending and descending of the polished rod 16 (under special conditions), the oil receiving groove 23 plays a role in storage, so that the trace crude oil and other mixtures cannot overflow to the ground along with the ascending and descending of the polished rod 16, and pollution of wellhead environment and ground is caused. After the air bag 2 is inflated by the high-pressure inflator through the inflation nozzle 3, the inner wall of the air bag 2 expands to encircle the sealing polish rod 16; the internal thread at the lower part of the air bag box 4 is connected with the external thread at the upper part of the steering ball head 6, and the packing pressing block 5 and the packing 19 are tightly screwed and extruded to secondarily seal the polish rod 16; then the position of the steering ball head 6 is adjusted according to the inclination of the polish rod 16, the ball head fastening sleeve 7 is screwed appropriately, the rubber 18 is pushed tightly and is in a micro-opening state, three seals are formed, and the polish rod is in a complete seal at the moment, so that the working state can be achieved. When the packing 19 needs to be periodically replaced, the handle 10 is screwed, the rubber 18 is pushed to be closely combined with the polish rod 16 through the push rod 12 and the push plate 13, the space below the coupling 14 is closed, upward pressure transmission of crude oil, natural gas and other substances in a wellhead is cut off, and the axial packing 19 in the steering ball head 6 can be conveniently replaced.
Claims (10)
1. The utility model provides a beam-pumping unit polished rod synthesizes sealing device which characterized in that: the device comprises a polished rod, an oil receiving mechanism, a strong magnetic sealing mechanism, an air bag flexible sealing mechanism, a ball head extrusion packing sealing mechanism, a rubber micro-sealing mechanism and a centralizing mechanism which are sequentially arranged around the polished rod; the surface of the polished rod is provided with a stainless steel protective coating through spraying measures, the top of the polished rod is a polished rod thread, and the bottom of the polished rod is a polished rod coupling; the oil receiving mechanism comprises an oil receiving shell and an oil receiving groove arranged in the center of the oil receiving shell; the strong magnetic sealing mechanism comprises a magnet box and a strong magnet arranged in the magnet box; the air bag flexible sealing mechanism comprises an air bag box, an air bag arranged in the box, an air charging connector connected with the air bag and penetrating through the side wall of the air bag box, an air charging connector fixing frame and an air charging connector protecting cap; the bulb extrusion packing sealing mechanism comprises a steering bulb, a packing pressing block, a packing, a bulb fastening sleeve and a bulb base, wherein the packing wraps a polished rod and fills the hollow inside the steering bulb; the rubber micro-sealing mechanism comprises a cylinder, a rubber, a push plate, a push rod and a handle, wherein the rubber and the push plate are positioned in a cavity of the cylinder, the rubber wraps the polished rod, the inner end and the outer end of the push rod are respectively connected with the push plate and the handle, and the upper part of the cylinder and the ball head base are fixed into a whole; the righting mechanism comprises a coupling and a righting block which is arranged inside the coupling and surrounds the polish rod, and the upper part of the coupling is fixedly integrated with the cylinder.
2. The pumping unit polish rod comprehensive sealing device according to claim 1, wherein: the thickness of the stainless steel protective coating reaches 0.5 mu m.
3. The pumping unit polish rod comprehensive sealing device according to claim 1, wherein: the stainless steel protective coating is made of 30CrMoA.
4. The pumping unit polish rod comprehensive sealing device according to claim 1, wherein: the powerful magnet is hollow annular, and the polish rod penetrates through the powerful magnet.
5. The pumping unit polish rod comprehensive sealing device according to claim 1, wherein: the air bag is hollow and circular, and the polish rod penetrates through the air bag; the inflation nozzle fixing frame comprises a front pipe and a rear pipe, the center of the front pipe passes through the inflation nozzle, the rear pipe is in threaded connection with the side wall of the air bag box through external threads, and the front pipe is in threaded connection with the inflation nozzle protecting cap through internal threads; the air charging nozzle protective cap is provided with an inner cavity for accommodating the end part of the air charging nozzle and is provided with external threads meshed with the internal threads of the front pipe at the periphery of the rear part; the outer periphery of the front tube of the air charging nozzle fixing frame and the outer periphery of the front part of the air charging nozzle protecting cap are respectively provided with an outer hexagon.
6. The pumping unit polish rod comprehensive sealing device according to claim 1, wherein: the steering ball head is bulb-shaped.
7. The pumping unit polish rod comprehensive sealing device according to claim 1, wherein: the oil receiving shell, the magnet box and the air bag box are fixed together through four fastening screws; the air bag box is connected with the upper part of the steering ball head, the ball head fastening sleeve is connected with the ball head base, and the coupling is connected with the centralizing block through threads.
8. The pumping unit polish rod comprehensive sealing device according to claim 1, wherein: the outer sides of the air bag box and the ball head fastening sleeve are respectively provided with a locking handle.
9. The pumping unit polish rod comprehensive sealing device according to claim 1, wherein: and three sealing rings are arranged between the ball head base and the bottom of the steering ball head.
10. The pumping unit polish rod comprehensive sealing device according to claim 1, wherein: the ball head base is made of copper; the packing is made of fluororubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420726252.1U CN220909653U (en) | 2024-04-10 | 2024-04-10 | Comprehensive sealing device for polished rod of oil pumping unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420726252.1U CN220909653U (en) | 2024-04-10 | 2024-04-10 | Comprehensive sealing device for polished rod of oil pumping unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220909653U true CN220909653U (en) | 2024-05-07 |
Family
ID=90905387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202420726252.1U Active CN220909653U (en) | 2024-04-10 | 2024-04-10 | Comprehensive sealing device for polished rod of oil pumping unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220909653U (en) |
-
2024
- 2024-04-10 CN CN202420726252.1U patent/CN220909653U/en active Active
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