CN221194987U - Hollow sucker rod with internal corrosion-proof - Google Patents
Hollow sucker rod with internal corrosion-proof Download PDFInfo
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- CN221194987U CN221194987U CN202421173785.8U CN202421173785U CN221194987U CN 221194987 U CN221194987 U CN 221194987U CN 202421173785 U CN202421173785 U CN 202421173785U CN 221194987 U CN221194987 U CN 221194987U
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- sucker rod
- hollow sucker
- corrosion
- resistant
- reinforcing ribs
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 68
- 239000010959 steel Substances 0.000 claims abstract description 68
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- 230000003014 reinforcing effect Effects 0.000 claims abstract description 56
- 230000007797 corrosion Effects 0.000 claims abstract description 44
- 239000003292 glue Substances 0.000 claims abstract description 31
- 239000011248 coating agent Substances 0.000 claims abstract description 8
- 238000000576 coating method Methods 0.000 claims abstract description 8
- 239000003822 epoxy resin Substances 0.000 claims abstract description 7
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 7
- 238000005096 rolling process Methods 0.000 claims description 13
- 239000011247 coating layer Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 2
- 238000005299 abrasion Methods 0.000 abstract description 6
- 239000003208 petroleum Substances 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
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- 238000003466 welding Methods 0.000 description 5
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- 239000010779 crude oil Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
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- 238000005728 strengthening Methods 0.000 description 3
- 239000013043 chemical agent Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
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- 239000002994 raw material Substances 0.000 description 1
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Abstract
The utility model relates to the technical field of hollow sucker rods for petroleum industry, in particular to an internal anti-corrosion hollow sucker rod. The technical proposal is as follows: the inner cavity of the hollow sucker rod main body is provided with a lining steel pipe, the outer wall of the lining steel pipe is uniformly provided with fixed reinforcing ribs, high-temperature-resistant and corrosion-resistant glue is coated between the fixed reinforcing ribs, and the high-temperature-resistant and corrosion-resistant glue and the fixed reinforcing ribs are contacted with the inner wall of the hollow sucker rod main body; two ends of the lining steel pipe respectively pass through the club head square head, the shoulder, the stress relief groove and the inner cavity of the outer interface, and are welded and fixed at the outer end; the inner wall of the lining steel pipe is coated with an epoxy resin corrosion-resistant coating; the outer wall of the hollow sucker rod main body is provided with a hollow sucker rod centralizer. The beneficial effects are that: the utility model increases the bonding area of the high-temperature-resistant corrosion-resistant adhesive, improves the connection firmness between the lining steel pipe and the hollow sucker rod main body, and reduces contact type abrasion and prolongs the service life by installing the hollow sucker rod centralizer outside the hollow sucker rod main body.
Description
Technical Field
The utility model relates to the technical field of hollow sucker rods for petroleum industry, in particular to an internal anti-corrosion hollow sucker rod.
Background
In petroleum industry, a sucker rod is formed by connecting steel pipes of a wellhead to a downhole sucker rod pump in series, and consists of threads at two ends, square diameters, a transition section and a rod body, wherein the strength of the sucker rod is divided into a C-level rod and a D-level rod, and the strength of the sucker rod is 570MPa and 810MPa respectively. The hollow sucker rod is a product developed along with the electric heating technology of thick oil and the chemical agent descending viscosity reducing technology, the viscosity reducing chemical agent is injected into the underground by utilizing the hollow characteristic of the hollow sucker rod, or an armored electric heater is descended into a shaft, crude oil in the shaft is heated by the vortex effect and the skin effect, wax deposition in the oil pipe is prevented, and the fluidity of the crude oil is increased. Thus, hollow sucker rods are one type of production for high viscosity, high freezing point, high waxy crude oil. However, with the large-scale use of hollow sucker rods, large hollow sucker rods are eliminated regularly in large oil fields in China every year, and if the old sucker rods can be subjected to a set of processing technology, metal fatigue is eliminated, and the metallographic structure is recovered, the method is an effective way for realizing waste utilization, saving energy and reducing consumption.
The Chinese patent application number is 201110284841.6, the patent name is "production and remanufacturing technology of upsetting hollow sucker rod", and the production technology of upsetting hollow sucker rod provided comprises: raw materials are put into factories; straightening and sizing; magnetic leakage flaw detection; upsetting the club head; normalizing and tempering; straightening; surface strengthening; flaw detection of the club head; processing screw threads; testing water pressure; the inner wall is corrosion-proof; the coupling and the protective cap are arranged; and (5) packaging. The provided remanufacturing process of the upsetting hollow sucker rod comprises the steps of truncating the waste sucker rod; cleaning; annealing; rolling and repairing the inner wall and the outer wall; cutting the head and sizing; upsetting the club head; normalizing; tempering; straightening; surface strengthening; flaw detection of the club head; processing screw threads; cleaning the inner wall and dredging the channels; testing water pressure; the inner wall is corrosion-proof; the coupling and the protective cap are arranged; and (5) packaging. The technology adopts the waste hollow sucker rod, and the steel pipe is not filled in the waste hollow sucker rod, so that the cost is low, the waste utilization is realized, the performance index is reduced, and the service life is reduced when the technology is specifically used.
In addition, in sucker rod pumping systems, both in vertical and inclined wells, the vertical movement of the hollow sucker rod is used to generate contact and relative movement on the inner wall of the oil pipe, so that unavoidable abrasion exists between the hollow sucker rod and the oil pipe, and the hollow sucker rod is worn out or the oil pipe is worn out.
Disclosure of utility model
The utility model aims at overcoming the defects in the prior art, and provides the internal anti-corrosion hollow sucker rod, wherein the inner lining steel pipe is arranged in the inner cavity of the hollow sucker rod main body, the outer wall of the inner lining steel pipe is provided with the fixed reinforcing ribs, and the high temperature resistant and corrosion resistant glue is coated between the fixed reinforcing ribs and on the outer side of the fixed reinforcing ribs, so that the connection firmness between the inner lining steel pipe and the hollow sucker rod main body is improved, and the service life of the internal anti-corrosion hollow sucker rod is prolonged; and the hollow sucker rod centralizer is arranged outside the hollow sucker rod main body, so that contact type abrasion is reduced, and the service life is prolonged.
The utility model relates to an internal anti-corrosion hollow sucker rod, which has the technical scheme that: the hollow sucker rod comprises a hollow sucker rod main body, a thick rod head, a rod head square head, a shoulder, an outer connector, a stress release groove, a lining steel pipe and a fixed reinforcing rib, wherein the thick rod head is formed by upsetting the two ends of the hollow sucker rod main body, the rod head square head is arranged on the outer side of the thick rod head, the shoulder with the outer diameter larger than the outer diameter of the thick rod head is arranged on the outer side of the rod head square head, and the outer connector is arranged on the outer side of the shoulder through the stress release groove; the inner cavity of the hollow sucker rod main body is provided with a lining steel pipe, the outer wall of the lining steel pipe is uniformly provided with fixed reinforcing ribs, high-temperature-resistant and corrosion-resistant glue is coated between and outside the fixed reinforcing ribs, and the high-temperature-resistant and corrosion-resistant glue is contacted with the inner wall of the hollow sucker rod main body; two ends of the lining steel pipe respectively penetrate through the square head of the club head, the shoulder, the stress relief groove and the inner cavity of the outer interface, and are welded and fixed at the outer end; the inner wall of the lining steel pipe is coated with an epoxy resin corrosion-resistant coating; the outer wall of the hollow sucker rod main body is provided with a hollow sucker rod centralizer.
Preferably, the fixing reinforcing ribs adopt annular reinforcing ribs, the annular reinforcing ribs are uniformly distributed on the outer wall of the lining steel pipe, high-temperature-resistant and corrosion-resistant glue is coated between the annular reinforcing ribs and on the outer side of the annular reinforcing ribs, and the high-temperature-resistant and corrosion-resistant glue and the annular reinforcing ribs are in contact with the inner wall of the hollow sucker rod main body.
Preferably, the fixing reinforcing ribs adopt spiral reinforcing ribs, the spiral reinforcing ribs are uniformly distributed on the outer wall of the lining steel pipe, high-temperature-resistant and corrosion-resistant glue is coated between and outside the spiral reinforcing ribs, and the high-temperature-resistant and corrosion-resistant glue and the spiral reinforcing ribs are in contact with the inner wall of the hollow sucker rod main body.
Preferably, the outer walls of the club head square head, the shoulder and the stress release groove are coated with a wear-resistant and corrosion-resistant coating layer.
Preferably, the above-mentioned club head has a spindle-shaped structure, and the cross section of the club head has a square structure.
Preferably, the hollow sucker rod centralizer comprises a centralizer body, limiting grooves and rolling balls, wherein the limiting grooves are uniformly distributed on the outer wall of the centralizer body, and the rolling balls are arranged in the inner cavities of the limiting grooves.
Preferably, the centralizer body and the ball are made of wear-resistant materials.
The beneficial effects of the utility model are as follows: according to the utility model, the lining steel pipe is arranged in the inner cavity of the hollow sucker rod main body, the fixed reinforcing ribs are uniformly distributed on the outer wall of the lining steel pipe, and the high-temperature-resistant corrosion-resistant glue is coated between the fixed reinforcing ribs and on the outer side of the lining steel pipe, so that the contact surface between the high-temperature-resistant corrosion-resistant glue and the inner wall of the hollow sucker rod main body is increased, the lining steel pipe can be better adhered to the inner wall of the hollow sucker rod main body, and the welding of the two ends is combined, so that the fixing firmness of the lining steel pipe and the hollow sucker rod main body is improved, and the situation that the lining steel pipe falls off under the action of external force is avoided;
In addition, the inner wall of the lining steel pipe is coated with an epoxy resin corrosion-resistant coating, so that the corrosion resistance of the lining steel pipe can be improved, and the performance indexes of the lining steel pipe are all in a good state because the installed lining steel pipe is a brand new steel pipe; in addition, the outer wall of the hollow sucker rod main body is provided with the hollow sucker rod centralizer, and the rolling ball is in contact with the inner wall of the oil pipe, so that the abrasion between the rolling ball and the oil pipe is reduced, and the service lives of the hollow sucker rod centralizer and the oil pipe are prolonged.
Drawings
FIG. 1 is a schematic view of the overall structure of the present utility model;
FIG. 2 is a schematic illustration of a structure without a hollow sucker rod centralizer installed;
FIG. 3 is a schematic cross-sectional view of the hollow sucker rod body part of FIG. 2;
FIG. 4 is a schematic view of the structure of a first embodiment of a lined steel pipe;
fig. 5 is a schematic view of the structure of the lined steel pipe of the first embodiment coated with the high temperature resistant and corrosion resistant glue;
FIG. 6 is a schematic structural view of a second embodiment of a lined steel pipe;
Fig. 7 is a schematic view of a structure in which the lining steel pipe of the second embodiment is coated with a high temperature resistant and corrosion resistant glue;
In the upper graph: hollow sucker rod main body 1, thick pole head 2, pole head square head 3, circular bead 4, external connection 5, stress relief groove 6, lining steel pipe 7, fixed strengthening rib 8, high temperature resistant corrosion resistant glue 9, hollow sucker rod centralizer 10, centralizer body 10.1, spacing groove 10.2, spin 10.3.
Detailed Description
The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.
1, Referring to fig. 1-5, the utility model relates to an internal anti-corrosion hollow sucker rod, which comprises a hollow sucker rod main body 1, a thick rod head 2, a rod head square head 3, a shoulder 4, an outer joint 5, a stress relief groove 6, an inner lining steel pipe 7 and fixing reinforcing ribs 8, wherein the thick rod head 2 is formed by upsetting two ends of the hollow sucker rod main body 1, the rod head square head 3 is arranged on the outer side of the thick rod head 2, the shoulder 4 with the outer diameter larger than the outer diameter of the thick rod head 2 is arranged on the outer side of the rod head square head 3, and the outer joint 5 is arranged on the outer side of the shoulder 4 through the stress relief groove 6; the inner cavity of the hollow sucker rod main body 1 is provided with lining steel pipes 7, the outer walls of the lining steel pipes 7 are uniformly distributed with fixed reinforcing ribs 8, high-temperature-resistant and corrosion-resistant glue 9 is coated between and outside the fixed reinforcing ribs 8, and the high-temperature-resistant and corrosion-resistant glue 9 is in contact with the inner wall of the hollow sucker rod main body 1; two ends of the lining steel pipe 7 respectively penetrate through the inner cavities of the club head square head 3, the shoulder 4, the stress relief groove 6 and the outer connector 5, and are welded and fixed at the outer end; the inner wall of the lining steel pipe 7 is coated with an epoxy resin corrosion-resistant coating; the outer wall of the hollow sucker rod main body 1 is provided with a hollow sucker rod centralizer 10.
Referring to fig. 4 and 5, the fixing reinforcing ribs 8 are annular reinforcing ribs, the annular reinforcing ribs are uniformly distributed on the outer wall of the lining steel pipe 7, high-temperature-resistant and corrosion-resistant glue 9 is coated between the annular reinforcing ribs and on the outer side of the annular reinforcing ribs, the high-temperature-resistant and corrosion-resistant glue 9 can be better contacted with the inner wall of the hollow sucker rod main body 1 under the support of the annular reinforcing ribs, the bonding area is increased, and therefore the inner wall of the hollow sucker rod main body 1 can be better bonded, and welding of two ends is combined, so that the fixing firmness of the lining steel pipe 7 and the hollow sucker rod main body 1 is improved, and the situation that the lining steel pipe 7 falls off under the action of external force is avoided.
In addition, the outer walls of the club head 3, the shoulder 4 and the stress release groove 6 are coated with the wear-resistant and corrosion-resistant coating layer, nylon can be used for coating, and the wear resistance of the outer walls of the club head 3, the shoulder 4 and the stress release groove 6 is improved.
In addition, the thick rod head 2 is of a spindle-shaped structure, so that the strength uniformity of the whole hollow sucker rod main body 1 is improved, the possibility that the problem is easy to occur at the welding position of the traditional rod body and the rod head is avoided, and the section of the rod head square head 3 is of a square structure, so that the hollow sucker rod is convenient to screw by a spanner.
In addition, referring to fig. 1, the hollow sucker rod centralizer 10 of the present utility model includes a centralizer body 10.1, a limit groove 10.2 and a rolling ball 10.3, wherein the limit groove 10.2 is uniformly distributed on the outer wall of the centralizer body 10.1, and the rolling ball 10.3 is installed in the inner cavity of the limit groove 10.2, so that when the hollow sucker rod centralizer 10 contacts with an oil pipe, the rolling ball 10.3 contacts with the hollow sucker rod centralizer, thereby reducing abrasion between the hollow sucker rod centralizer 10 and the oil pipe, and prolonging the service life of the hollow sucker rod centralizer 10 and the oil pipe.
The centralizer body 10.1 is formed by connecting two semi-cylindrical structures, so that the centralizer is convenient to install and combine; the centralizer body 10.1 and the ball 10.3 are made of wear-resistant materials, so that the service lives of the centralizer body 10.1 and the ball 10.3 can be prolonged.
According to the utility model, the lining steel pipe 7 is arranged in the inner cavity of the hollow sucker rod main body 1, the outer walls of the lining steel pipes 7 are uniformly distributed with the fixed reinforcing ribs 8, the high-temperature-resistant corrosion-resistant glue 9 is coated between and outside the fixed reinforcing ribs 8, and the high-temperature-resistant corrosion-resistant glue 9 is contacted with the inner wall of the hollow sucker rod main body 1, so that the lining steel pipe 7 can be better adhered to the inner wall of the hollow sucker rod main body 1, and the welding of the two ends is combined, so that the fixing firmness of the lining steel pipe 7 and the hollow sucker rod main body 1 is improved, and the situation that the lining steel pipe 7 falls off under the action of external force is avoided; in addition, the inner wall of the lining steel pipe 7 is coated with an epoxy resin corrosion-resistant coating, so that the corrosion resistance of the lining steel pipe 7 can be improved, and the performance indexes of the lining steel pipe 7 are all in a better state because the lining steel pipe 7 is a brand new steel pipe; in addition, the hollow sucker rod centralizer 10 is arranged on the outer wall of the hollow sucker rod main body 1, and the rolling ball 10.3 is in contact with the inner wall of the oil pipe, so that the abrasion between the rolling ball and the oil pipe is reduced, and the service lives of the hollow sucker rod centralizer 10 and the oil pipe are prolonged.
The embodiment 2 of the utility model relates to an internal anti-corrosion hollow sucker rod, which comprises a hollow sucker rod main body 1, a thick rod head 2, a rod head square head 3, a shoulder 4, an external interface 5, a stress release groove 6, a lining steel pipe 7 and a fixed reinforcing rib 8, wherein the two ends of the hollow sucker rod main body 1 are formed into the thick rod head 2 through upsetting, the rod head square head 3 is arranged on the outer side of the thick rod head 2, the shoulder 4 with the outer diameter larger than the outer diameter of the thick rod head 2 is arranged on the outer side of the rod head square head 3, and the external interface 5 is arranged on the outer side of the shoulder 4 through the stress release groove 6; the inner cavity of the hollow sucker rod main body 1 is provided with lining steel pipes 7, the outer walls of the lining steel pipes 7 are uniformly distributed with fixed reinforcing ribs 8, high-temperature-resistant and corrosion-resistant glue 9 is coated between and outside the fixed reinforcing ribs 8, and the high-temperature-resistant and corrosion-resistant glue 9 is in contact with the inner wall of the hollow sucker rod main body 1; two ends of the lining steel pipe 7 respectively penetrate through the inner cavities of the club head square head 3, the shoulder 4, the stress relief groove 6 and the outer connector 5, and are welded and fixed at the outer end; the inner wall of the lining steel pipe 7 is coated with an epoxy resin corrosion-resistant coating; the outer wall of the hollow sucker rod main body 1 is provided with a hollow sucker rod centralizer 10.
The difference from example 1 is that:
Referring to fig. 6 and 7, the fixing reinforcing ribs 8 are spiral reinforcing ribs, spiral reinforcing ribs are uniformly distributed on the outer wall of the lining steel pipe 7, high-temperature-resistant and corrosion-resistant glue 9 is coated between the spiral reinforcing ribs and on the outer side of the spiral reinforcing ribs, the high-temperature-resistant and corrosion-resistant glue 9 and the spiral reinforcing ribs are in contact with the inner wall of the hollow sucker rod main body 1, so that the high-temperature-resistant and corrosion-resistant glue 9 is uniformly distributed on the outer wall of the lining steel pipe 7, the lining steel pipe 7 can be better adhered to the inner wall of the hollow sucker rod main body 1, and welding of two ends is combined, so that the fixing firmness of the lining steel pipe 7 and the hollow sucker rod main body 1 is improved, and the situation that the lining steel pipe 7 falls off under the action of external force is avoided.
The above description is of the preferred embodiments of the present utility model, and any person skilled in the art may modify the present utility model or make modifications to the present utility model with the technical solutions described above. Therefore, any simple modification or equivalent made according to the technical solution of the present utility model falls within the scope of the protection claimed by the present utility model.
Claims (7)
1. An internal corrosion-proof hollow sucker rod, which comprises a hollow sucker rod main body (1), and is characterized in that: the novel oil pumping rod comprises a hollow sucker rod body (1), and is characterized by further comprising a thick rod head (2), a rod head square head (3), a shoulder (4), an outer connector (5), a stress release groove (6), a lining steel pipe (7) and fixed reinforcing ribs (8), wherein the two ends of the hollow sucker rod body (1) are formed into the thick rod head (2) through upsetting, the rod head square head (3) is arranged on the outer side of the thick rod head (2), the shoulder (4) with the outer diameter larger than the outer diameter of the thick rod head (2) is arranged on the outer side of the rod head square head (3), and the outer connector (5) is arranged on the outer side of the shoulder (4) through the stress release groove (6); the inner cavity of the hollow sucker rod main body (1) is provided with lining steel pipes (7), the outer walls of the lining steel pipes (7) are uniformly provided with fixed reinforcing ribs (8), high-temperature-resistant and corrosion-resistant glue (9) is coated between and outside the fixed reinforcing ribs (8), and the high-temperature-resistant and corrosion-resistant glue (9) is in contact with the inner wall of the hollow sucker rod main body (1); two ends of the lining steel pipe (7) respectively penetrate through the inner cavities of the club head square head (3), the shoulder (4), the stress release groove (6) and the outer connector (5), and are welded and fixed at the outer end; the inner wall of the lining steel pipe (7) is coated with an epoxy resin corrosion-resistant coating; the outer wall of the hollow sucker rod main body (1) is provided with a hollow sucker rod centralizer (10).
2. The inner anti-corrosion hollow sucker rod according to claim 1, wherein: the fixing reinforcing ribs (8) are annular reinforcing ribs, annular reinforcing ribs are uniformly distributed on the outer wall of the lining steel pipe (7), high-temperature-resistant and corrosion-resistant glue (9) is coated between the annular reinforcing ribs and outside the annular reinforcing ribs, and the high-temperature-resistant and corrosion-resistant glue (9) and the annular reinforcing ribs are in contact with the inner wall of the hollow sucker rod main body (1).
3. The inner anti-corrosion hollow sucker rod according to claim 1, wherein: the fixing reinforcing ribs (8) are spiral reinforcing ribs, spiral reinforcing ribs are uniformly distributed on the outer wall of the lining steel pipe (7), high-temperature-resistant and corrosion-resistant glue (9) is coated between and outside the spiral reinforcing ribs, and the high-temperature-resistant and corrosion-resistant glue (9) and the spiral reinforcing ribs are in contact with the inner wall of the hollow sucker rod main body (1).
4. An inner anti-corrosion hollow sucker rod according to claim 2 or 3, characterized in that: the outer walls of the club head square head (3), the shoulder (4) and the stress release groove (6) are coated with a wear-resistant and corrosion-resistant coating layer.
5. The inner anti-corrosion hollow sucker rod according to claim 4, wherein: the thick club head (2) is of a spindle-shaped structure, and the cross section of the club head square head (3) is of a square structure.
6. The inner anti-corrosion hollow sucker rod according to claim 5, wherein: the hollow sucker rod centralizer (10) comprises a centralizer body (10.1), limiting grooves (10.2) and rolling balls (10.3), wherein the limiting grooves (10.2) are uniformly distributed on the outer wall of the centralizer body (10.1), and the rolling balls (10.3) are arranged in the inner cavity of the limiting grooves (10.2).
7. The inner anti-corrosion hollow sucker rod according to claim 6, wherein: the centralizer body (10.1) and the rolling ball (10.3) are made of wear-resistant materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421173785.8U CN221194987U (en) | 2024-05-28 | 2024-05-28 | Hollow sucker rod with internal corrosion-proof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421173785.8U CN221194987U (en) | 2024-05-28 | 2024-05-28 | Hollow sucker rod with internal corrosion-proof |
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| Publication Number | Publication Date |
|---|---|
| CN221194987U true CN221194987U (en) | 2024-06-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202421173785.8U Active CN221194987U (en) | 2024-05-28 | 2024-05-28 | Hollow sucker rod with internal corrosion-proof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221194987U (en) |
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2024
- 2024-05-28 CN CN202421173785.8U patent/CN221194987U/en active Active
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