CN220812624U - Corrosion protection device for outer wall of equipment - Google Patents
Corrosion protection device for outer wall of equipment Download PDFInfo
- Publication number
- CN220812624U CN220812624U CN202322635831.3U CN202322635831U CN220812624U CN 220812624 U CN220812624 U CN 220812624U CN 202322635831 U CN202322635831 U CN 202322635831U CN 220812624 U CN220812624 U CN 220812624U
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- Prior art keywords
- wall
- protective cover
- sacrificial anode
- periphery
- equipment
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- 230000007797 corrosion Effects 0.000 title claims abstract description 30
- 238000005260 corrosion Methods 0.000 title claims abstract description 30
- 230000001681 protective effect Effects 0.000 claims abstract description 34
- 230000006835 compression Effects 0.000 claims abstract description 13
- 238000007906 compression Methods 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims description 14
- 230000002093 peripheral effect Effects 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000012153 distilled water Substances 0.000 claims description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 claims description 4
- 239000011701 zinc Substances 0.000 claims description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 239000011777 magnesium Substances 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 230000002045 lasting effect Effects 0.000 abstract description 2
- NMFHJNAPXOMSRX-PUPDPRJKSA-N [(1r)-3-(3,4-dimethoxyphenyl)-1-[3-(2-morpholin-4-ylethoxy)phenyl]propyl] (2s)-1-[(2s)-2-(3,4,5-trimethoxyphenyl)butanoyl]piperidine-2-carboxylate Chemical compound C([C@@H](OC(=O)[C@@H]1CCCCN1C(=O)[C@@H](CC)C=1C=C(OC)C(OC)=C(OC)C=1)C=1C=C(OCCN2CCOCC2)C=CC=1)CC1=CC=C(OC)C(OC)=C1 NMFHJNAPXOMSRX-PUPDPRJKSA-N 0.000 description 9
- 238000003466 welding Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 238000004210 cathodic protection Methods 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 238000005507 spraying Methods 0.000 description 7
- 230000008439 repair process Effects 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229910001039 duplex stainless steel Inorganic materials 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009659 non-destructive testing Methods 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 241001640558 Cotoneaster horizontalis Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Abstract
The utility model discloses an equipment outer wall corrosion protection device, which comprises a protection cover, a support ring, a sacrificial anode, a compression ring and a fixing nut, wherein the protection cover is arranged on the support ring; the protective cover is used for covering the periphery of the leakage channel arranged on the outer wall of the equipment and welded on the outer wall of the equipment; the sacrificial anode penetrates through the protective cover, an accommodating space is formed between the inner periphery of the protective cover and the outer periphery of the part of the sacrificial anode, which is positioned in the protective cover, and the accommodating space is filled with a medium; the support ring is sleeved on the periphery of the part of the sacrificial anode protruding out of the protective cover, and one axial end of the support ring is welded and fixed with the protective cover; the compression ring is sleeved on the periphery of the part, protruding out of the support ring, of the sacrificial anode, and compresses the support ring; the fixing nut is sleeved on the periphery of the part of the sacrificial anode protruding out of the compression ring. The equipment outer wall corrosion protection device has lasting protection effect, does not need to drill holes on equipment and the like, and cannot damage the equipment. The cost is low, the sacrificial anode for protection can be detached, and the sacrificial anode only needs to be replaced regularly.
Description
Technical Field
The utility model relates to the technical field of nuclear power, in particular to a corrosion protection device for an outer wall of equipment.
Background
The metal container for containing seawater and other corrosive medium is made of corrosion-resistant materials such as duplex stainless steel or rubber-lined metal pipe, and is leaked due to the factors such as equipment manufacturing quality, medium corrosion and the like. Because of the generally high cost and long manufacturing cycle of these devices, there is a need for a convenient, safe and reliable repair process and apparatus.
In general, conventional treatment schemes for duplex stainless steel container leaks have drawbacks such as repair welding, inner wall spray protection, impressed current cathodic protection, sacrificial anode methods, and the like. The defect removing repair welding generally needs the process steps of defect polishing and removing, groove finishing, non-destructive testing of the surface before welding, welding repair, post-welding solution treatment, non-destructive testing after welding and the like, but is not generally adopted in consideration of the conditions of online repair and non-post-welding solution treatment. The inner wall spraying protection generally refers to coating epoxy resin on the inner wall of a container or a pipeline, thoroughly cleaning the inner wall of the pipeline before inner wall spraying, cleaning by adopting a mechanical steel wire brush and sand blasting, mixing epoxy resin components and a curing agent according to a proportion after surface treatment reaches the standard, and then sending the mixture into a spraying device for inner wall coating. For parts with simple structures, such as pipelines, the inner wall spraying effect is good, but for parts with complex structures like a volute, the problems of uneven inner wall spraying and even missing spraying exist, and in addition, the risks of coating shelling and peeling exist after the inner wall spraying material is in service for a long time. Impressed current cathodic protection is also known as forced current cathodic protection. The impressed current cathodic protection is to change the potential of the surrounding environment through an external power supply, so that the potential of equipment to be protected is always lower than that of the surrounding environment, thereby becoming a cathode in the whole environment, and the equipment to be protected cannot be corroded due to the loss of electrons.
Disclosure of utility model
The utility model aims to solve the technical problem of providing a corrosion protection device for the outer wall of equipment.
The technical scheme adopted for solving the technical problems is as follows: constructing an equipment outer wall corrosion protection device, which comprises a protection cover, a supporting ring, a sacrificial anode, a compression ring and a fixing nut;
The protective cover is used for covering the periphery of the leakage channel on the outer wall of the equipment and is welded on the outer wall of the equipment;
The sacrificial anode penetrates through the protective cover, an accommodating space is formed between the inner periphery of the protective cover and the outer periphery of the part of the sacrificial anode, which is positioned in the protective cover, and the accommodating space is filled with a medium;
The support ring is sleeved on the periphery of the part of the sacrificial anode protruding out of the protective cover, and one axial end of the support ring is welded and fixed with the protective cover;
The compression ring is sleeved on the periphery of the part of the sacrificial anode protruding out of the support ring and compresses the support ring;
The fixing nut is sleeved on the periphery of the part, protruding out of the compression ring, of the sacrificial anode.
In some embodiments, the protective cover is cylindrical, the protective cover comprises an end wall and a surrounding wall extending from the end wall, and a first through hole is formed in the end wall for one end of the sacrificial anode to pass through;
the enclosing wall is arranged on the periphery of the leakage channel in a surrounding mode, and one end, away from the end wall, of the enclosing wall is fixed with the outer wall of the equipment in a welding mode.
In some embodiments, the sacrificial anode includes first and second axially connected shaft portions;
The diameter of the first shaft part is larger than that of the second shaft part; the first shaft part penetrates through the first through hole and partially enters the inner cavity of the protective cover, and the end part of the first shaft part is arranged at intervals with the outer wall of the equipment;
the support ring is sleeved on the periphery of the part, protruding out of the protective cover, of the first shaft part.
In some embodiments, the support ring has an outer diameter that is less than an outer diameter of the end wall.
In some embodiments, the clamp ring is cylindrical, the clamp ring including a body portion and a peripheral portion extending from the body portion;
The main body part is provided with a second through hole so as to be sleeved on the periphery of the second shaft part;
the inner diameter of the peripheral part is larger than or equal to the outer diameter of the supporting ring, and the peripheral part is arranged on the periphery of part of the supporting ring in a surrounding way;
A first sealing gasket is arranged between the main body part and one end, far away from the protective cover, of the compression ring.
In some embodiments, the outer circumference of the second shaft portion is provided with external threads;
the fixing nut is sleeved on the second shaft part, and a second sealing gasket is arranged between the fixing nut and the main body part.
In some embodiments, the first sealing gasket and the second sealing gasket are each made of polytetrafluoroethylene.
In some embodiments, the medium comprises distilled water.
In some embodiments, the shield, the support ring, the clamp ring, and the retaining nut are stainless steel pieces.
In some embodiments, the sacrificial anode comprises an aluminum anode, a zinc anode, or a magnesium anode.
The implementation of the utility model has the following beneficial effects: the equipment outer wall corrosion protection device has lasting protection effect, does not need to drill holes on equipment and the like, and cannot damage the equipment. The cost is low, the sacrificial anode for protection can be detached, and the sacrificial anode only needs to be replaced regularly.
Drawings
In order to more clearly illustrate the technical solution of the present utility model, the following description will be given with reference to the accompanying drawings and examples, it being understood that the following drawings only illustrate some examples of the present utility model and should not be construed as limiting the scope, and that other related drawings can be obtained from these drawings by those skilled in the art without the inventive effort. In the accompanying drawings:
FIG. 1 is a schematic illustration of the application of an apparatus outer wall corrosion protection device in some embodiments of the utility model;
FIG. 2 is a schematic view of a portion of the structure of FIG. 1;
FIG. 3 is an exploded view of an apparatus outer wall corrosion protection device in some embodiments of the utility model.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present utility model, a detailed description of embodiments of the present utility model will be made with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are configured and operated in specific directions based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model, and do not indicate that the apparatus or element to be referred to must have specific directions, and thus should not be construed as limiting the present utility model.
It should also be noted that unless explicitly stated or limited otherwise, terms such as "mounted," "connected," "secured," "disposed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or one or more intervening elements may also be present. The terms "first," "second," "third," and the like are used merely for convenience in describing the present utility model and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, whereby features defining "first," "second," "third," etc. may explicitly or implicitly include one or more such features. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present utility model. It will be apparent, however, to one skilled in the art that the present utility model may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present utility model with unnecessary detail.
Referring to fig. 1 to 3, the present utility model shows an apparatus outer wall corrosion protection device, which can solve the problem of leakage failure of the outer wall of a metal container with corrosive medium.
In some embodiments, the apparatus outer wall corrosion protection device may include a shield 1, a support ring 2, a sacrificial anode 3, a clamp ring 4, and a retaining nut 5.
The shield 1 is used for covering the outer periphery of the leakage channel 101 of the outer wall 100 of the device, and the shield 1 is welded to the outer wall 100 of the device. The sacrificial anode 3 is arranged on the protective cover 1 in a penetrating way, an accommodating space is formed between the inner periphery of the protective cover 1 and the outer periphery of the part, located in the protective cover 1, of the sacrificial anode 3, and a medium 6 is filled in the accommodating space so as to realize that the cathode (the outer wall 100 of the equipment), the medium 6 and the sacrificial anode 3 are contacted and connected to form a primary battery, thereby achieving the protective effect of the cathode (the outer wall 100 of the equipment). The support ring 2 is sleeved on the periphery of the part, protruding out of the protective cover 1, of the sacrificial anode 3, and one axial end of the support ring 2 is welded and fixed with the protective cover 1, wherein the part A is a sealing weld formed by welding. The compression ring 4 is sleeved on the periphery of the part of the sacrificial anode 3 protruding out of the support ring 2 and compresses the support ring 2. The fixing nut 5 is fitted around the outer periphery of the portion of the sacrificial anode 3 protruding from the clamp ring 4.
In some embodiments, the shield 1 is cylindrical, the shield 1 comprising an end wall 11 and a surrounding wall 12 extending from the end wall 11. Preferably, the enclosure wall 12 is formed by the circumferential extension of the end wall 11. The end wall 11 is provided with a first through hole 111 for the passage of one end of the sacrificial anode 3. The enclosure wall 12 is arranged around the periphery of the leakage channel 101, and the end of the enclosure wall 12 remote from the end wall 11 is welded to the outer wall 100 of the device.
In some embodiments, the sacrificial anode 3 may include a first shaft portion 31 and a second shaft portion 32 that are axially connected. The diameter of the first shaft portion 31 is larger than the diameter of the second shaft portion 32. The first shaft 31 is disposed through the first through hole 111 and partially enters the inner cavity of the protection cover 1, and the end of the first shaft 31 is spaced from the outer wall 100 of the device.
The support ring 2 is fitted around the outer periphery of the portion of the first shaft 31 protruding from the shield 1.
Preferably, the outer diameter of the support ring 2 is smaller than the outer diameter of the end wall 11, the inner diameter of the support ring 2 may be similar to the diameter of the first shaft portion 31, e.g. the inner diameter of the support ring 2 may be the same as the diameter of the first shaft portion 31.
In some embodiments, the clamp ring 4 is cylindrical in shape, and the clamp ring 4 includes a main body portion 41 and a peripheral portion 42 extending from the main body portion 41. The main body 41 is provided with a second through hole 411 so as to be fitted around the outer periphery of the second shaft 32. Preferably, the second through hole 411 has an inner diameter similar to the diameter of the second shaft portion 32, for example, may be the same size.
The inner diameter of the peripheral portion 42 is equal to or larger than the outer diameter of the support ring 2, and the peripheral portion 42 is provided around a part of the outer periphery of the support ring 2. A first sealing gasket 7 is provided between the main body 41 and the end of the clamp ring 4 remote from the shield 1.
In some embodiments, the outer circumference of the second shaft portion 32 is provided with external threads; the fixing nut 5 is sleeved on the second shaft portion 32, and a second sealing gasket 8 is arranged between the fixing nut 5 and the main body portion 41. Preferably, the side of the main body 41 facing the fixing nut 5 may be provided with a receiving groove, and the second sealing gasket 8 may be provided in the receiving groove.
In some embodiments, the first sealing gasket 7 and the second sealing gasket 8 are both made of polytetrafluoroethylene.
In some embodiments, the medium 6 may comprise distilled water, such that the medium 6 may be confined in the receiving space due to the liquid in the leakage channel 101 having a certain pressure. When the medium 6 is placed, distilled water ice cubes or ice particles can be used, and are stored in the accommodating space first, and after the medium 6 is melted, liquid distilled water can be formed. Of course, other non-corrosive media may be used for the medium 6, and are not particularly limited herein.
In some embodiments, the shield 1, the support ring 2, the clamp ring 4 and the fixing nut 5 are made of stainless steel, for example, the shield 1, the support ring 2, the clamp ring 4 and the fixing nut 5 may be made of stainless steel 304.
In some embodiments, the sacrificial anode 3 may comprise an aluminum anode, a zinc anode, or a magnesium anode. Preferably, the sacrificial anode 3 is a zinc anode.
Understandably, the apparatus outer wall corrosion protection device performs weld repair and corrosion protection of the leakage container based on sacrificial anode cathodic protection. The sacrificial anode cathodic protection method is also called sacrificial anode protection method, namely, the metal with stronger reducibility is used as a protection electrode and is connected with the protected metal to form a primary cell, the metal with stronger reducibility is used as a negative electrode to be oxidized and consumed, and the protected metal is used as a positive electrode to avoid corrosion. The sacrificial anode method has the characteristics of simple installation, uniform potential distribution, no need of external power supply, no need of daily management and maintenance and the like, and is widely used for corrosion protection of structures in contact with seawater.
The equipment outer wall corrosion protection device has the following beneficial effects:
(1) The protection effect is durable: the sacrificial anode cathodic protection method is a mature corrosion protection technology, and the protection effect is durable.
(2) The damage to equipment is small: the equipment is not required to be drilled and the like, so that the equipment is not damaged;
(3) Low cost and quick replacement: the sacrificial anode for protection can be detached, and only the sacrificial anode needs to be replaced periodically.
It is to be understood that the above examples only represent preferred embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the utility model; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several variations and modifications can be made without departing from the scope of the utility model; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (10)
1. The equipment outer wall corrosion protection device is characterized by comprising a protection cover (1), a support ring (2), a sacrificial anode (3), a compression ring (4) and a fixing nut (5);
the protective cover (1) is used for covering the periphery of a leakage channel (101) of the outer wall (100) of the equipment, and the protective cover (1) is welded on the outer wall (100) of the equipment;
The sacrificial anode (3) is arranged on the protective cover (1) in a penetrating manner, an accommodating space is formed between the inner periphery of the protective cover (1) and the outer periphery of the part, located in the protective cover (1), of the sacrificial anode (3), and a medium (6) is filled in the accommodating space;
The support ring (2) is sleeved on the periphery of the part, protruding out of the protective cover (1), of the sacrificial anode (3), and one axial end of the support ring (2) is welded and fixed with the protective cover (1);
The compression ring (4) is sleeved on the periphery of the part of the sacrificial anode (3) protruding out of the support ring (2) and compresses the support ring (2);
The fixing nut (5) is sleeved on the periphery of the part, protruding out of the compression ring (4), of the sacrificial anode (3).
2. The equipment outer wall corrosion protection device according to claim 1, wherein the protection cover (1) is cylindrical, the protection cover (1) comprises an end wall (11) and a surrounding wall (12) extending from the end wall (11), and a first through hole (111) is formed in the end wall (11) for allowing one end of the sacrificial anode (3) to penetrate through;
the surrounding wall (12) is arranged around the periphery of the leakage channel (101), and one end, far away from the end wall (11), of the surrounding wall (12) is welded and fixed with the outer wall (100) of the equipment.
3. The apparatus outer wall corrosion protection device according to claim 2, wherein the sacrificial anode (3) comprises a first shaft portion (31) and a second shaft portion (32) axially connected;
The diameter of the first shaft part (31) is larger than the diameter of the second shaft part (32); the first shaft part (31) penetrates through the first through hole (111) and partially enters the inner cavity of the protective cover (1), and the end part of the first shaft part (31) is arranged at intervals with the outer wall (100) of the equipment;
The support ring (2) is sleeved on the periphery of the part of the first shaft part (31) protruding out of the protective cover (1).
4. A corrosion protection device for an outer wall of an apparatus according to claim 3, characterized in that the outer diameter of the support ring (2) is smaller than the outer diameter of the end wall (11).
5. A corrosion protection device for an outer wall of an apparatus according to claim 3, wherein the clamp ring (4) has a cylindrical shape, the clamp ring (4) including a main body portion (41) and a peripheral portion (42) extending from the main body portion (41);
the main body part (41) is provided with a second through hole (411) so as to be sleeved on the periphery of the second shaft part (32);
The inner diameter of the peripheral part (42) is larger than or equal to the outer diameter of the supporting ring (2), and the peripheral part (42) is arranged on the periphery of part of the supporting ring (2) in a surrounding mode;
a first sealing gasket (7) is arranged between the main body part (41) and one end, far away from the protective cover (1), of the compression ring (4).
6. The apparatus outer wall corrosion protection device according to claim 5, wherein the outer circumference of the second shaft portion (32) is provided with an external thread;
The fixing nut (5) is sleeved on the second shaft part (32), and a second sealing gasket (8) is arranged between the fixing nut (5) and the main body part (41).
7. The apparatus outer wall corrosion protection device according to claim 6, characterized in that the first sealing gasket (7) and the second sealing gasket (8) are both made of polytetrafluoroethylene.
8. The apparatus outer wall corrosion protection device according to any one of claims 1 to 7, wherein the medium (6) comprises distilled water.
9. The apparatus outer wall corrosion protection device according to any one of claims 1 to 7, wherein the protective cover (1), the support ring (2), the compression ring (4) and the fixing nut (5) are stainless steel pieces.
10. The apparatus outer wall corrosion protection device according to any one of claims 1 to 7, wherein the sacrificial anode (3) comprises an aluminium anode, a zinc anode or a magnesium anode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322635831.3U CN220812624U (en) | 2023-09-26 | 2023-09-26 | Corrosion protection device for outer wall of equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322635831.3U CN220812624U (en) | 2023-09-26 | 2023-09-26 | Corrosion protection device for outer wall of equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220812624U true CN220812624U (en) | 2024-04-19 |
Family
ID=90709324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322635831.3U Active CN220812624U (en) | 2023-09-26 | 2023-09-26 | Corrosion protection device for outer wall of equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220812624U (en) |
-
2023
- 2023-09-26 CN CN202322635831.3U patent/CN220812624U/en active Active
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