CN111064013A - Pure platinum needle water electrode with high connection and sealing reliability - Google Patents
Pure platinum needle water electrode with high connection and sealing reliability Download PDFInfo
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- CN111064013A CN111064013A CN201911387716.0A CN201911387716A CN111064013A CN 111064013 A CN111064013 A CN 111064013A CN 201911387716 A CN201911387716 A CN 201911387716A CN 111064013 A CN111064013 A CN 111064013A
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- H—ELECTRICITY
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- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/005—Electrical coupling combined with fluidic coupling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/02—Contact members
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/02—Contact members
- H01R13/03—Contact members characterised by the material, e.g. plating, or coating materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/40—Securing contact members in or to a base or case; Insulating of contact members
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/40—Securing contact members in or to a base or case; Insulating of contact members
- H01R13/405—Securing in non-demountable manner, e.g. moulding, riveting
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/46—Bases; Cases
- H01R13/502—Bases; Cases composed of different pieces
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/46—Bases; Cases
- H01R13/52—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/46—Bases; Cases
- H01R13/52—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases
- H01R13/5202—Sealing means between parts of housing or between housing part and a wall, e.g. sealing rings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R3/00—Electrically-conductive connections not otherwise provided for
- H01R3/08—Electrically-conductive connections not otherwise provided for for making connection to a liquid
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/16—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for manufacturing contact members, e.g. by punching and by bending
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/20—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for assembling or disassembling contact members with insulating base, case or sleeve
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/20—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for assembling or disassembling contact members with insulating base, case or sleeve
- H01R43/24—Assembling by moulding on contact members
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Abstract
The invention discloses a structural scheme of a pure platinum needle water electrode with high connection and sealing reliability and a manufacturing method thereof. One end of the stainless steel insert of the water electrode is an electrode wiring terminal, and the end extends inwards from the end surface and is provided with an electrode connecting hole; the other end is a platinum needle mounting end, and the end is provided with a threaded hole for compressing and fixing the platinum needle. The platinum needle is inserted into the inner hole of the stainless steel loosening-stopping piece, and the platinum needle is tightly pressed through the loosening-stopping piece and the stainless steel embedded platinum needle mounting end in a matching manner; the pressing gasket has an inverted wedge-shaped structure after being preassembled, and the encapsulated injection molding electrode body has a structure anti-loosening effect, so that the encapsulation of injection molding during encapsulation can be ensured to be reliable. The inner O-shaped ring is positioned on the combined surface of the stainless steel insert and the electrode body, and has the function of further improving the waterproof sealing effect; the water electrode is obtained into an electrode body by an encapsulation injection molding method. The invention has the characteristics of high reliability of connection and sealing, and can ensure excellent electric contact performance and sealing performance of the water electrode in long-term use.
Description
Technical Field
The invention relates to a structural scheme of a pure platinum needle water electrode with high connection and sealing reliability and a manufacturing method thereof, belonging to the technical field of platinum needle water electrodes.
Background
In some cooling systems of high-voltage power equipment, in order to clamp the potential difference of the cooling liquid, water electrodes are required to be arranged at different positions of a cooling pipeline to ensure that the potential differences of the cooling liquid at different positions are equal. Platinum metal is an excellent water electrode material because it has very excellent electrochemical inertness. Generally, to reduce the cost, platinum plating of stainless steel is used as the electrode portion material. However, for some demanding applications, pure platinum is still required as an electrode material for water electrodes.
At present, a thin-walled tube is processed at one end of a stainless steel electrode body, and a platinum needle is plugged into the thin-walled tube and then is shrunk through rolling processing to compress the platinum needle. The structure is very easy to cause the problem that the platinum needle is loosened in the using process. The main reasons for this analysis include two, the first: the stainless steel thin-walled tube can partially rebound after being rolled, so that the stainless steel thin-walled tube is not really pressed; secondly, the method comprises the following steps: the platinum material is soft and easy to deform, and can generate plastic deformation under the dynamic impact of flowing cooling liquid in long-term use, so that the platinum material is loosened from the stainless steel thin-wall pipe. Therefore, a pure platinum needle water electrode structure which can ensure the connection reliability of the platinum needle and the electrode body and has excellent sealing performance is needed.
Disclosure of Invention
In order to solve the technical problems, the invention discloses a pure platinum needle water electrode with high connection and sealing reliability and a manufacturing method thereof. The pure platinum needle water electrode with high connection and sealing reliability comprises a platinum needle, a stainless steel insert, an electrode encapsulation body, a locking piece, a compression gasket, an inner O-shaped ring and an outer O-shaped ring.
One end of the platinum needle is processed into a T-shaped structure, and the platinum needle is prevented from being pulled out or loosened by pressing the T-shaped structure of the platinum needle.
One end of the stainless steel insert is provided with a platinum needle fixing hole, and the other end of the stainless steel insert is provided with an electrode connecting hole; the peripheral surface of the electrode is provided with a gully structure to increase the length of a sealing surface after being combined with the encapsulated electrode body, and a fixing groove of an O-shaped ring in the electrode is processed.
Furthermore, the platinum needle fixing hole of the stainless steel insert is of an internal thread structure. The platinum needle is inserted into the inner hole of the anti-loosening element and is tightly pressed and fixed through the screwing of the external thread of the anti-loosening element and the internal thread of the stainless steel inlay. The fluoroplastic pressing gasket is sleeved on the platinum needle.
Furthermore, the electrode body is made of fluoroplastic materials, the insert is wrapped through the encapsulation injection molding process, and the electrode end of the platinum needle and the electrode connecting hole end of the insert are exposed.
Furthermore, the pressing gasket is in a circular truncated cone shape, and the diameter of the pressing gasket is gradually increased along with the approach of the loosening stopping piece.
Further, the device also comprises an inner O-shaped ring and an outer O-shaped ring; the inner O-shaped ring is sleeved in the groove of the stainless steel inlay and is used for improving the waterproof reliability of the joint surface of the stainless steel insert and the fluoroplastic rubber coated body; the external O-shaped ring is sleeved in the external groove of the electrode body and used for realizing the overall sealing performance of the water electrode after installation.
Further, the T-shaped end of the platinum needle remains at a positive tolerance. And a positive tolerance is kept after the T-shaped head of the platinum needle is processed, and the platinum needle is tightly attached to the insert body by compressing the head part of the platinum needle to generate plastic deformation during assembly.
A method for manufacturing a pure platinum needle water electrode with high connection and sealing reliability comprises
Step 1, forming and processing a platinum needle: a platinum needle penetrates into an inner hole of the loosening-stopping piece, and the forming processing of the T-shaped head structure of the platinum needle is completed through cold pressing processing or other similar processes; in addition, the loosening-stopping piece is processed during processing, so that the loosening-stopping piece and the platinum needle can be tightly attached to each other;
step 3, encapsulation and injection molding: putting the assembly body finished in the step 2 into an injection mold, and performing encapsulation and injection molding to obtain an electrode body;
step 4, assembling an external sealing ring: and sleeving an external O-shaped ring into the groove of the electrode body to complete the manufacturing and assembling process of the whole platinum needle water electrode.
The invention has the beneficial effects that:
the invention can firstly ensure that the platinum needle has high connection reliability and connection strength: the platinum needle T-shaped head forms reliable structural looseness prevention and has large pull-out resistance; after the platinum needle is locked by the anti-loosening piece, the reverse-buckling structure is formed again through the compression gasket and the encapsulation injection molding to further prevent loosening.
Secondly, the invention can ensure high sealing reliability and avoid leakage phenomenon: the combination surface of the rubber-coated fluoroplastic body and the stainless steel insert is long and zigzag, so that the reliability of water sealing is improved; the O-shaped ring is additionally arranged inside the sealing ring, so that the sealing reliability is further improved. Further, the way of fixing the platinum pins does not reduce the length of the sealing surface of the water.
Finally, the invention can ensure excellent electric contact performance: the T-shaped end is integrally processed on the platinum needle and the loosening prevention piece, so that the platinum needle and the inner hole of the loosening prevention piece are tightly attached, and good electrical contact performance between the platinum needle and the loosening prevention piece is guaranteed; and a positive tolerance is left after the T-shaped head of the platinum needle is processed, and the platinum needle head is subjected to plastic deformation through assembly, so that the platinum needle is tightly attached to the insert body.
Drawings
Figure 1 is a schematic view of the structure of the present invention,
figure 2 is a cross-sectional view of the present invention,
reference numerals: 1-platinum needle, 2-loose-stopping piece, 3-stainless steel insert, 4-internal O-shaped ring, 5-pressing gasket, 6-electrode body, 7-external O-shaped ring, 31-platinum needle fixing hole, 32-electrode connecting hole, 3 a-external connecting part, 3 b-middle transition part and 3 c-platinum needle fixing part.
Detailed Description
The present invention is further illustrated by the following figures and specific examples, which are to be understood as illustrative only and not as limiting the scope of the invention, which is to be given the full breadth of the appended claims and any and all equivalent modifications thereof which may occur to those skilled in the art upon reading the present specification.
As shown in figure 1, the pure platinum needle water electrode with high connection and sealing reliability comprises an electrode body 6, wherein the electrode body 6 comprises two integrally formed parts, as shown in figures 1 and 2, the diameter of the right part is larger, the diameter of the left part is smaller, and the outer wall of the part with the smaller diameter is provided with threads. The joint of the two parts is provided with a circle of groove, and an external O-shaped ring for fastening is arranged in the groove. The electrode body 1 is formed by injection molding and pouring and is consistent with the shape of an injection mold. The electrode body 6 is a rubber coating body made of fluoroplastic materials.
The stainless steel inlay 3 is embedded in the electrode body 6. There is the interval in the one end of stainless steel inlay 3 and the left end of electrode body 6, and the other end protrusion is in the right-hand member of electrode body 1 in the retraction promptly in electrode body 1.
The stainless steel inlay 3 has a platinum needle fixing hole 31 at the left end and an electrode connecting hole 32 at the right end. The platinum needle fixing hole 31 is a screw groove and the electrode connecting hole 32 is for connection with the outside, and the shape thereof is selected to be a screw shape in this embodiment. An internal O-shaped ring is arranged in the external groove of the stainless steel inlay 3 to fasten the stainless steel inlay.
One end of the platinum needle 1 is a T-shaped end, and a stainless steel locking screw is sleeved on the end. The stainless steel locking screw is locked with the platinum needle fixing hole 31 through threads, so that the T-shaped end extends into the bottom of the platinum needle fixing hole 31. The other end of the platinum needle 1 sequentially extends out of the stainless steel screw 2, the stainless steel inlay 3 and the electrode body 4 from right to left, a compression gasket made of fluoroplastic materials is arranged at the junction of the electrode body 4 and the platinum needle 1, the outer wall of the platinum needle 1 is sleeved with the compression gasket, the stainless steel locking screw 2 is compressed, and the compression gasket and the left end of the electrode body 1 are kept flush.
As shown in fig. 2, the end of the stainless steel locking screw 2 is exposed outside the stainless steel insert. The structure setting of this end, easily control, cooperation use instrument such as screw-up spanner ensures that stainless steel locking screw presses T type end to platinum needle fixed orifices 31 bottom.
The pressing gasket 5 is of an inverted wedge structure, and the structure enables the encapsulated injection-molded electrode body and the electrode body to form an interlocking mechanism. As shown in fig. 2, due to the limitation of the electrode body structure, the pressing gasket cannot move to the left side, so that the stainless steel locking screw is limited in the platinum needle fixing hole and is not loosened.
In addition, when the electrode body is subjected to encapsulation and injection molding, one side of the mold presses the locking gasket, and the other side of the mold presses the electrode connecting end part of the stainless steel insert, and the pressing gasket is made of soft and elastic fluoroplastic, so that reliable encapsulation of the mold can be realized within a large manufacturing tolerance range.
The manufacturing process of the invention comprises the following steps:
step 1, forming and processing a platinum needle: penetrating a platinum needle into an inner hole of the loosening-stopping piece, finishing the forming processing of the T-shaped head of the platinum needle by cold pressing processing or other processes, and ensuring that the loosening-stopping piece and the platinum needle are tightly attached to each other;
step 3, encapsulation and injection molding: putting the assembly body finished in the step 2 into an injection mold, and performing encapsulation and injection molding to obtain an electrode body;
step 4, assembling an external sealing ring: and sleeving an external O-shaped ring into the groove of the electrode body to complete the manufacture of the whole platinum needle water electrode.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The utility model provides a high connection and seal reliability pure platinum needle water electrode which characterized in that: comprises a platinum needle (1), a stainless steel insert (3) and an electrode body (6),
one end of the stainless steel insert (3) is provided with a platinum needle fixing hole (31), and the other end of the stainless steel insert is provided with an electrode connecting hole (32);
one end of the platinum needle (1) is a T-shaped end, and the end is locked in the platinum needle fixing hole (31) through the locking piece (2);
the root of the T-shaped end of the platinum needle (1) is also sleeved with a pressing gasket (5), and the pressing gasket (5) presses the loosening-stopping piece (2);
the electrode body (6) wraps the compression gasket (5) and the stainless steel inlay (3) integrally, and the platinum needle (1) extends to the outside of the electrode body (6).
2. The pure platinum needle water electrode with high connection and sealing reliability as claimed in claim 1, wherein: the sealing ring also comprises an inner O-shaped ring (4) and an outer O-shaped ring (7); the inner O-shaped ring (4) is positioned on a joint surface of the stainless steel insert (3) and the electrode body (6), and the outer O-shaped ring (7) is sleeved in a groove outside the electrode body (6).
3. The pure platinum needle water electrode with high connection and sealing reliability as claimed in claim 1, wherein: the loosening-stopping piece (2) is made of stainless steel, and the platinum needle fixing hole (31) is a threaded hole; the platinum needle (1) is inserted into the inner hole of the loosening prevention piece (2), and the T-shaped end of the platinum needle (1) is abutted to the bottom of the platinum needle fixing hole (31) to realize locking through the threaded fit of the external thread of the loosening prevention piece and the platinum needle fixing hole (31).
4. The pure platinum needle water electrode with high connection and sealing reliability as claimed in claim 3, wherein: the compression gasket (5) is of an inverted wedge-shaped structure and made of fluoroplastic materials, and the compression gasket is sleeved on the outer wall of the platinum needle (1) and compresses the anti-loosening piece (2).
5. The pure platinum needle water electrode with high connection and sealing reliability as claimed in claim 1, wherein: the joint surface of the stainless steel insert (4) and the electrode body (6) is of a zigzag gully structure so as to increase the length of the sealing surface.
6. The pure platinum needle water electrode with high connection and sealing reliability as claimed in claim 1, wherein: the height of the T-shaped end of the platinum needle (1) keeps a positive tolerance.
7. A manufacturing method of a pure platinum needle water electrode with high connection and sealing reliability is characterized by comprising the following steps: comprises that
Step 1, forming and processing a platinum needle: penetrating a platinum needle into an inner hole of the loosening-stopping piece, finishing the forming processing of the T-shaped head of the platinum needle by cold pressing processing or other processes, and simultaneously enabling the loosening-stopping piece and the platinum needle to be tightly attached to each other;
step 2, insert assembly: fixing the integrated structure of the platinum needle and the loosening-stopping piece completed in the step 1 with a stainless steel insert, sleeving a compression gasket on the root of the platinum needle, and installing an internal O-shaped ring;
step 3, encapsulation and injection molding: putting the assembly body finished in the step 2 into an injection mold, and performing encapsulation and injection molding to obtain an electrode body;
step 4, assembling an external sealing ring: and sleeving an external O-shaped ring into the external groove of the electrode body to complete the manufacture of the whole platinum needle water electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911387716.0A CN111064013B (en) | 2019-12-30 | 2019-12-30 | Pure platinum needle water electrode with high connection and sealing reliability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911387716.0A CN111064013B (en) | 2019-12-30 | 2019-12-30 | Pure platinum needle water electrode with high connection and sealing reliability |
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| Publication Number | Publication Date |
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| CN111064013A true CN111064013A (en) | 2020-04-24 |
| CN111064013B CN111064013B (en) | 2021-06-01 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1936083A (en) * | 2006-09-12 | 2007-03-28 | 中国船舶重工集团公司第七一八研究所 | Corrosion resistant alkaline water electrolytic hydrogen-preparing apparatus container |
| CN206389291U (en) * | 2016-12-12 | 2017-08-08 | 中国南方电网有限责任公司超高压输电公司贵阳局 | A kind of high voltage direct current converter valve screening electrodes mounting structure |
| CN206697606U (en) * | 2017-05-27 | 2017-12-01 | 常州博瑞电力自动化设备有限公司 | A kind of equipotential water electrode assembly |
| CN206931714U (en) * | 2017-07-20 | 2018-01-26 | 常州博瑞电力自动化设备有限公司 | Spiral water electrode |
| CN107681906A (en) * | 2017-09-26 | 2018-02-09 | 许继集团有限公司 | A kind of converter valve screening electrodes |
| CN209043395U (en) * | 2018-12-19 | 2019-06-28 | 开封开创测控技术有限公司 | A kind of electromagnetic flowmeter small electrode mounting structure |
-
2019
- 2019-12-30 CN CN201911387716.0A patent/CN111064013B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1936083A (en) * | 2006-09-12 | 2007-03-28 | 中国船舶重工集团公司第七一八研究所 | Corrosion resistant alkaline water electrolytic hydrogen-preparing apparatus container |
| CN206389291U (en) * | 2016-12-12 | 2017-08-08 | 中国南方电网有限责任公司超高压输电公司贵阳局 | A kind of high voltage direct current converter valve screening electrodes mounting structure |
| CN206697606U (en) * | 2017-05-27 | 2017-12-01 | 常州博瑞电力自动化设备有限公司 | A kind of equipotential water electrode assembly |
| CN206931714U (en) * | 2017-07-20 | 2018-01-26 | 常州博瑞电力自动化设备有限公司 | Spiral water electrode |
| CN107681906A (en) * | 2017-09-26 | 2018-02-09 | 许继集团有限公司 | A kind of converter valve screening electrodes |
| CN209043395U (en) * | 2018-12-19 | 2019-06-28 | 开封开创测控技术有限公司 | A kind of electromagnetic flowmeter small electrode mounting structure |
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