CN113898802A - Anti-corrosion flange connecting structure - Google Patents
Anti-corrosion flange connecting structure Download PDFInfo
- Publication number
- CN113898802A CN113898802A CN202111251430.7A CN202111251430A CN113898802A CN 113898802 A CN113898802 A CN 113898802A CN 202111251430 A CN202111251430 A CN 202111251430A CN 113898802 A CN113898802 A CN 113898802A
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- Prior art keywords
- flange
- loose
- connection
- corrosion
- threaded section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005260 corrosion Methods 0.000 title claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 12
- 238000009413 insulation Methods 0.000 claims description 21
- 238000010292 electrical insulation Methods 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 3
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 description 8
- 239000013535 sea water Substances 0.000 description 8
- 238000006056 electrooxidation reaction Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910001369 Brass Inorganic materials 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 239000010974 bronze Substances 0.000 description 2
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 2
- 238000005536 corrosion prevention Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L23/00—Flanged joints
- F16L23/02—Flanged joints the flanges being connected by members tensioned axially
- F16L23/024—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L25/00—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means
- F16L25/02—Electrically insulating joints or couplings
- F16L25/026—Electrically insulating joints or couplings for flanged joints
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/18—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings
- F16L58/187—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings for flanged joints
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Flanged Joints, Insulating Joints, And Other Joints (AREA)
Abstract
The invention relates to the technical field of ship construction, and discloses an anti-corrosion flange connecting structure which comprises connecting flanges and connecting pipelines made of different materials, wherein an insulating gasket is arranged between the end surfaces of the connecting pipelines and the connecting flanges, the outer parts of the connecting pipelines are connected with loose flanges, the loose flanges are connected with the connecting flanges through double-end studs, and insulating bushes are further connected between the double-end studs and the loose flanges or between the double-end studs and the connecting flanges. Direct contact forms first passageway between flange and the connecting tube, flange passes through stud simultaneously, loose flange and connecting tube form the second passageway, it cuts off first passageway to arrange insulating gasket between connecting tube's terminal surface and the flange, arrange insulating bush and cut off the second passageway between stud and loose flange or the flange, thereby electrically insulating between flange and the connecting tube, accomplish the electrical insulation anticorrosion between flange and the connecting tube that guarantee the material is different, the life of extension pipeline.
Description
Technical Field
The invention relates to the technical field of ship construction, in particular to an anti-corrosion flange connecting structure.
Background
The seawater system is an important component of a ship system, a large number of valves are arranged on the seawater system to control the passage of the seawater system, the valves and the pipelines are usually connected by flanges, and the flanges of the valves are made of bronze, brass, iron, steel and the like.
Seawater is used as an electrolyte solution, when different metals are contacted to form a closed loop, a primary battery reaction can occur, and more active metals pick up electrons to be oxidized, so that electrochemical corrosion is generated. The nickel copper and the steel can form electrochemical corrosion in seawater, the nickel copper is used as a positive electrode, the iron is used as a negative electrode, and the nickel copper loses electrons and is oxidized, which is a main reason for causing the nickel copper to be corroded.
When marine water piping of marine system is connected, the nickel copper pipe can be connected usually to the flange of valve, and the material of nickel copper pipe and flange is different, forms the return circuit behind flange and the nickel copper pipe joint to cause the pipeline to corrode, influence marine water piping's life, consequently prevent that the electrochemical corrosion branch pipe is important in marine water piping.
The flange type butterfly valve is characterized in that a mounting hole of the flange type butterfly valve is a hinged hole and needs to be fixedly mounted by a double-end stud, and after the double-end stud is connected with a flange of the butterfly valve, the flange forms a current loop with a pipeline through the double-end stud, so that the pipeline is corroded.
Disclosure of Invention
The purpose of the invention is: the utility model provides an anticorrosion flange connection structure to solve the flange among the prior art and pass through stud and pipeline connection back, form the problem that the electric current return circuit produced the corruption between flange and the pipeline.
In order to achieve the purpose, the invention provides an anti-corrosion flange connecting structure which comprises connecting flanges and connecting pipelines, wherein the connecting flanges and the connecting pipelines are made of different materials, insulating gaskets are arranged between the end surfaces of the connecting pipelines and the connecting flanges, loose flanges are connected to the outside of the connecting pipelines, the loose flanges are connected with the connecting flanges through double-end studs, and insulating bushes are further connected between the double-end studs and the loose flanges or between the double-end studs and the connecting flanges.
Preferably, one end of the stud bolt is a large-diameter threaded section, the other end of the stud bolt is a small-diameter threaded section, the insulating bushing is arranged on the small-diameter threaded section, and the radius difference between the large-diameter threaded section and the small-diameter threaded section is equal to the wall thickness of the insulating bushing.
Preferably, the insulation bushing is arranged between the loose flange and the stud, the small-diameter threaded section penetrates through the insulation bushing, and the large-diameter threaded section is in threaded connection with the connecting flange.
Preferably, the insulation bushing is screwed into the connecting flange, an internal thread is arranged on the inner wall of the insulation bushing, the small-diameter threaded section is screwed into the insulation bushing, and the large-diameter threaded section is screwed into the loose flange.
Preferably, an annular baffle table is arranged at the end part of the connecting pipeline, the loose flange is assembled with the annular baffle table in a blocking manner, and the insulating gasket is arranged between the annular baffle table and the connecting flange.
Preferably, an insulating sleeve is further arranged between the loose flange and the connecting pipeline.
Preferably, a threaded hole is formed in the connecting flange, the stud is assembled in the connecting flange in a threaded manner, a fastening nut is further assembled on the stud in a threaded manner, a gasket is assembled between the fastening nut and the loose flange, and a radial interval is formed between the gasket and the connecting pipeline.
Preferably, the washer includes a spring washer and a flat washer, the flat washer being disposed between the spring washer and the fastening nut.
Compared with the prior art, the anti-corrosion flange connecting structure provided by the embodiment of the invention has the beneficial effects that: the material of flange and connecting tube is different, if the contact can produce electrochemical corrosion in the sea water, direct contact forms first route between flange and the connecting tube, flange passes through stud simultaneously, loose flange forms the second route with the connecting tube, arrange insulating gasket between the terminal surface of connecting tube and the flange and cut off first route, arrange insulating bush and cut off the second route between stud and loose flange or the flange, thereby with the electrical insulation between flange and the connecting tube, guarantee to accomplish the electrical insulation anticorrosion between the flange that the material is different and the connecting tube, the life of extension pipeline.
Drawings
FIG. 1 is a schematic structural view of an anti-corrosion flanged connection according to the present invention;
FIG. 2 is a schematic structural view of a stud of the corrosion protected flanged connection of FIG. 1;
fig. 3 is a schematic structural view of another embodiment of the corrosion-resistant flange connection structure of the present invention.
In the figure, 1, a connecting flange; 2. connecting a pipeline; 21. an annular baffle table; 3. loosening the flange; 4. a stud; 41. a large-diameter thread section; 42. a small-diameter thread section; 5. an insulating spacer; 6. an insulating bushing; 7. an insulating sleeve; 8. fastening a nut; 9. a flat gasket; 10. a spring washer.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1 and 2, the corrosion-resistant flange connection structure of the present invention includes a connection flange 1 and a connection pipe 2, wherein the connection flange 1 and the connection pipe 2 are made of different materials, in this embodiment, the connection pipe 2 is made of a nickel-copper pipe, the connection flange 1 is a different metal accessory of a steel butterfly valve, and the connection flange 1 is usually made of brass or bronze.
The outside of connecting tube 2 still is connected with loose cover flange 3, and loose cover flange 3 covers in the outside of connecting tube 2, and loose cover flange 3 is used for the connection between connecting tube 2, the connecting flange 1, has seted up the through-hole on the loose cover flange 3, has seted up threaded blind hole on the connecting flange 1, and threaded blind hole is the reamed hole, passes through stud 4 internal connections between loose cover flange 3 and the connecting flange 1.
The double-end stud 4 is formed by turning a steel bar, the loose flange 3 is of a steel structure, the length of the double-end stud 4 is determined by exposing 1-3 teeth after the loose flange 3, the connecting flange 1, the fastening nut 8 and the like are installed, and the double-end stud 4 is made of 8.8-grade 45# steel, so that burrs of the mechanically cut or machined contour are removed and chamfering is guaranteed.
The material of flange 1 and connecting tube 2 is different, if contact can produce electrochemical corrosion in the sea water, direct contact forms first route between flange 1 and the connecting tube 2, and flange 1 passes through stud 4, loose flange 3 and connecting tube 2 forms the second route simultaneously.
An insulating gasket 5 is arranged between the end face of the connecting pipeline 2 and the end face of the connecting flange 1, an insulating bush 6 is further connected between the stud 4 and the loose flange 3 or the connecting flange 1, the insulating bush 5 cuts off a first passage, the insulating bush 6 cuts off a second passage, therefore, the connecting flange 1 and the connecting pipeline 2 are electrically insulated, the electric insulation and corrosion prevention between the connecting flange 1 and the connecting pipeline 2 which are made of different materials are guaranteed, and the service life of the pipeline is prolonged.
In this embodiment, the insulating bush 6 and the insulating spacer 5 may be made of rubber, resin, or the like.
Preferably, one end of the stud bolt 4 is a large-diameter threaded section 41, the other end of the stud bolt is a small-diameter threaded section 42, the insulation bushing 6 is arranged on the small-diameter threaded section 42, and the difference between the radii of the large-diameter threaded section 41 and the small-diameter threaded section 42 is equal to the wall thickness of the insulation bushing 6.
Under the normal condition, the diameters of the flange holes on the loose flange 3 and the connecting flange 1 are consistent, the diameters of the insulating bush 6 and the stud 4 can be larger than the diameter of the flange hole under the condition that the stud 4 is ensured to be connected with the loose flange 3 and the connecting flange 1 at the same time, so that a large-diameter threaded section 41 and a small-diameter threaded section 42 are formed at two ends of the stud 4 respectively, the radius difference is equal to the wall thickness of the insulating bush 6, the outer wall surface of the insulating bush 6 sleeved on the small-diameter threaded section 42 is flush with the outer wall surface of the large-diameter threaded section 41, and the stud 4 can be connected with the loose flange 3 and the connecting flange 1 on the premise that the flange hole diameter of the loose flange 3 does not need to be changed.
Preferably, the insulation bushing 6 is arranged between the loose flange 3 and the stud bolt 4, the small-diameter threaded section 42 penetrates through the insulation bushing 6, and the large-diameter threaded section 41 is in threaded connection with the connecting flange 1.
The insulating bush 6 cuts off a current path between the connecting flange 1 and the connecting pipeline 2 through the electric insulating loose flange 3 and the stud 4, and the anti-corrosion effect is achieved. The big footpath screw thread section 41 is direct and flange 1 threaded connection, increases threaded connection's structural strength, and the downthehole internal face that does not need processing screw thread with insulating bush 6 of flange 3 of loose cover simultaneously, the direct dress of wearing of path screw thread section 42 can in insulating bush 6, easy dismounting.
Preferably, as shown in fig. 3, the insulation bushing 6 is screw-fitted into the connection flange 1, an internal thread is disposed on an inner wall of the insulation bushing 6, the small-diameter threaded section 42 is screw-fitted into the insulation bushing 6, and the large-diameter threaded section 41 is screw-fitted into the loose flange 3.
The insulating bush 6 is arranged in the connecting flange 1 to insulate the stud bolt 4 from the connecting flange 1 so as to insulate a current path between the connecting flange 1 and the connecting pipeline 2 and realize the function of corrosion resistance. All process the screw thread on insulating bush 6's the inner wall and the outer wall this moment, insulating bush 6 and flange 1 screw thread assembly, insulating bush 6 and stud 4 screw thread assembly simultaneously, insulating bush 6's tip can be the enclosed construction this moment, strengthens insulating effect.
Preferably, an annular abutment 21 is disposed at an end of the connection pipe 2, the loose flange 3 is stop-fitted with the annular abutment 21, and the insulating gasket 5 is disposed between the annular abutment 21 and the connection flange 1.
The annular blocking table 21 can block the loose flange 3, so that the loose flange 3 can be conveniently installed, the end surface area of the connecting pipeline 2 can be increased, and the sealing performance is improved. And the insulating gasket 5 is arranged between the annular baffle platform 21 and the connecting flange 1, so that the area of the insulating gasket 5 can be increased, and the anti-corrosion effect is increased.
Preferably, an insulating sleeve 7 is also arranged between the loose flange 3 and the connecting pipe 2.
The insulation sleeve 7 can electrically insulate the loose flange 3 from the connecting pipeline 2, and when the insulation bushing 6 fails, the insulation sleeve 7 cuts off a passage among the connecting flange 1, the stud 4, the loose flange 3 and the connecting pipeline 2, so that an anti-corrosion effect is realized; meanwhile, electrochemical corrosion between the loose flange 3 and the connecting pipeline 2 can be prevented.
Preferably, a threaded hole is formed in the connecting flange 1, the stud bolt 4 is assembled in the connecting flange 1 in a threaded mode, a fastening nut 8 is further assembled on the stud bolt 4 in a threaded mode, a gasket is assembled between the fastening nut 8 and the loose flange 3, and a radial interval is formed between the gasket and the connecting pipeline 2.
The fastening nut 8 fastens the stud 4 to avoid loosening. The gasket plays a role in preventing backward movement and increasing the fastening force between the fastening nut 8 and the stud bolt 4. The radial spacing between the shims and the connecting tube 2 prevents the stud 4 from being electrochemically corroded by contact of the shims and the connecting tube 2.
Preferably, the washers include a spring washer 10 and a flat washer 9, the flat washer 9 being arranged between the spring washer 10 and the fastening nut 8.
The spring washer 10 exerts an axial force on the fastening nut 8, and plays a role in preventing looseness.
To sum up, the embodiment of the present invention provides an anti-corrosion flange connection structure, wherein the connection flange and the connection pipeline are made of different materials, if electrochemical corrosion is generated due to contact in seawater, the connection flange and the connection pipeline are in direct contact to form a first passage, meanwhile, the connection flange and the connection pipeline form a second passage through a stud and a loose flange, an insulating gasket is arranged between the end surface of the connection pipeline and the connection flange to separate the first passage, and an insulating bush is arranged between the stud and the loose flange or between the stud and the connection flange to separate the second passage, so that the connection flange and the connection pipeline are electrically insulated, the electrical insulation and corrosion prevention between the connection flange and the connection pipeline made of different materials are ensured, and the service life of the pipeline is prolonged.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (8)
1. The utility model provides an anticorrosion flange connection structure, its characterized in that, includes flange and the connecting tube that the material is different, the terminal surface of connecting tube with insulating gasket has been arranged between the flange, the external connection of connecting tube has loose set flange, loose set flange with connect through stud between the flange, stud with loose set flange or still be connected with insulating bush between the flange.
2. The anti-corrosion flange connection according to claim 1, wherein the stud bolt has a large-diameter threaded section at one end and a small-diameter threaded section at the other end, the insulating bush is disposed on the small-diameter threaded section, and a difference in radius between the large-diameter threaded section and the small-diameter threaded section is equal to a wall thickness of the insulating bush.
3. The anti-corrosion flange connection according to claim 2, wherein the insulation bushing is disposed between the loose flange and the stud bolt, the small-diameter threaded section passes through the insulation bushing, and the large-diameter threaded section is threadedly connected to the connection flange.
4. The anti-corrosion flange connection according to claim 2, wherein the insulation bushing is screw-fitted in the connection flange, an internal thread is disposed on an inner wall of the insulation bushing, the small-diameter threaded section is screw-fitted in the insulation bushing, and the large-diameter threaded section is screw-fitted in the loose flange.
5. The anti-corrosion flanged connection according to any one of claims 1 to 4, characterized in that an annular abutment is disposed at an end of the connection pipe, the loose flange is fitted with the annular abutment stop, and the insulating gasket is disposed between the annular abutment and the connection flange.
6. The anti-corrosion flanged connection according to claim 5, characterized in that an insulating sleeve is further disposed between the loose flange and the connection pipe.
7. The anti-corrosion flange connection according to any one of claims 1 to 4, wherein the connection flange is provided with a threaded hole, the stud bolt is threadedly assembled in the connection flange, a fastening nut is further threadedly assembled on the stud bolt, a gasket is assembled between the fastening nut and the loose flange, and the gasket is radially spaced from the connection pipe.
8. The anti-corrosion flanged connection of claim 7, wherein the gasket comprises a spring gasket and a flat gasket, the flat gasket being disposed between the spring gasket and the fastening nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111251430.7A CN113898802A (en) | 2021-10-26 | 2021-10-26 | Anti-corrosion flange connecting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111251430.7A CN113898802A (en) | 2021-10-26 | 2021-10-26 | Anti-corrosion flange connecting structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113898802A true CN113898802A (en) | 2022-01-07 |
Family
ID=79026878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111251430.7A Pending CN113898802A (en) | 2021-10-26 | 2021-10-26 | Anti-corrosion flange connecting structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113898802A (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2160608A (en) * | 1983-09-03 | 1985-12-24 | Brian James Wickins | Flanged connections |
| CN2596158Y (en) * | 2002-12-13 | 2003-12-31 | 宁波阿勒法管系机械制造有限公司 | Insulation connection structure of metal loosing flange pipe |
| CN201568426U (en) * | 2009-12-30 | 2010-09-01 | 郑洪琦 | Mini-sized stop screw |
| CN201748072U (en) * | 2010-07-19 | 2011-02-16 | 张积储 | Novel insulating flange pipe fitting |
| CN206468947U (en) * | 2017-02-10 | 2017-09-05 | 江苏新韩通船舶重工有限公司 | A kind of oil carrier stainless steel tube and carbon steel pipe anti-potential difference corrosion attachment means |
| CN107795774A (en) * | 2017-11-28 | 2018-03-13 | 中国人民解放军海军工程大学 | Naval vessel dissimilar metal piping junction corrosion safeguard structure and construction method |
| CN208348731U (en) * | 2018-03-31 | 2019-01-08 | 上海东震冶金工程技术有限公司 | The high pressure insulating flange of resistance to thermohydraulic |
| CN209164292U (en) * | 2018-10-23 | 2019-07-26 | 浙江乾泰机车部件有限公司 | Bolt with screw insulator |
| CN209800517U (en) * | 2019-04-30 | 2019-12-17 | 玉环县锦华机械有限公司 | Connecting bolt |
| US20200001970A1 (en) * | 2018-06-29 | 2020-01-02 | Airbus Operations Limited | Duct stringer |
| CN211117563U (en) * | 2019-10-31 | 2020-07-28 | 上海雷奎流体科技有限公司 | Sealing structure for high-voltage test section electrical insulation |
-
2021
- 2021-10-26 CN CN202111251430.7A patent/CN113898802A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2160608A (en) * | 1983-09-03 | 1985-12-24 | Brian James Wickins | Flanged connections |
| CN2596158Y (en) * | 2002-12-13 | 2003-12-31 | 宁波阿勒法管系机械制造有限公司 | Insulation connection structure of metal loosing flange pipe |
| CN201568426U (en) * | 2009-12-30 | 2010-09-01 | 郑洪琦 | Mini-sized stop screw |
| CN201748072U (en) * | 2010-07-19 | 2011-02-16 | 张积储 | Novel insulating flange pipe fitting |
| CN206468947U (en) * | 2017-02-10 | 2017-09-05 | 江苏新韩通船舶重工有限公司 | A kind of oil carrier stainless steel tube and carbon steel pipe anti-potential difference corrosion attachment means |
| CN107795774A (en) * | 2017-11-28 | 2018-03-13 | 中国人民解放军海军工程大学 | Naval vessel dissimilar metal piping junction corrosion safeguard structure and construction method |
| CN208348731U (en) * | 2018-03-31 | 2019-01-08 | 上海东震冶金工程技术有限公司 | The high pressure insulating flange of resistance to thermohydraulic |
| US20200001970A1 (en) * | 2018-06-29 | 2020-01-02 | Airbus Operations Limited | Duct stringer |
| CN209164292U (en) * | 2018-10-23 | 2019-07-26 | 浙江乾泰机车部件有限公司 | Bolt with screw insulator |
| CN209800517U (en) * | 2019-04-30 | 2019-12-17 | 玉环县锦华机械有限公司 | Connecting bolt |
| CN211117563U (en) * | 2019-10-31 | 2020-07-28 | 上海雷奎流体科技有限公司 | Sealing structure for high-voltage test section electrical insulation |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220107 |