CN212622374U - Online polarographic micro-dissolved oxygen electrode - Google Patents

Abstract

The utility model belongs to the field of electrodes, and particularly discloses an online polarographic micro-dissolved oxygen electrode, which comprises a shell, wherein one end of the shell is embedded with a fluorine rubber plug, a shielding wire is fixed in the fluorine rubber plug, the other end of the shell is connected with a connecting pipe through a sheath, and the outer end of the connecting pipe is inserted into a membrane cap in a threaded manner; a cathode structure is arranged in the connecting pipe and comprises a cathode inner shell and a cathode outer shell, the cathode inner shell is inserted into the cathode outer shell, the lower end of the cathode inner shell is provided with a pressing block arranged in the cathode outer shell, the pressing block is in threaded connection with the inner wall of the cathode outer shell, and the bottom surface of the pressing block is attached with a layer of cathode gold sheet; the membrane cap middle part trompil is installed and is passed through the oxygen membrane, and connecting pipe both ends opening and inside cavity to it has electrolyte to pour into at its inside, and the connecting pipe upper end inlays and is equipped with the silica gel gasket sealed with the electrolyte, packs heat conduction epoxy in the sheath, and the cathode structure upper end is passed the silica gel gasket and is arranged in heat conduction epoxy, inlays in this heat conduction epoxy and is equipped with the temperature electrode of being connected with the shielded conductor.

Description

Online polarographic micro-dissolved oxygen electrode

Technical Field

The utility model relates to an electrode field specifically is an online polarographic micro-dissolved oxygen electrode.

Background

The dissolved oxygen electrode can be used to monitor processes where oxygen content can affect reaction rate, process efficiency or the environment: such as aquaculture, biological reaction, environmental tests (lakes, streams, oceans), water/wastewater treatment, wine production, has higher stability and reliability, can be used in severe environments, and has smaller maintenance amount.

At present, platinum is commonly used as a cathode material in China, and is more convenient to sinter with glass. However, platinum has poor oxidation resistance and is slightly inferior to a trace dissolved oxygen cathode material, while the gold material has good oxidation resistance, but has high sintering difficulty with glass, easy cracking of glass and low success rate.

Disclosure of Invention

An object of the utility model is to provide an online polarographic trace dissolved oxygen electrode to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: an online polarographic trace dissolved oxygen electrode comprises a shell, wherein one end of the shell is embedded with a fluorine rubber plug, a shielding wire is fixed in the fluorine rubber plug, the other end of the shell is connected with a connecting pipe through a sheath, and the outer end of the connecting pipe is inserted into a membrane cap in a threaded manner; a cathode structure is arranged in the connecting pipe, the cathode structure comprises a cathode inner shell and a cathode outer shell, the cathode inner shell is inserted into the cathode outer shell, the lower end of the cathode inner shell is provided with a pressing block arranged in the cathode outer shell, the pressing block is in threaded connection with the inner wall of the cathode outer shell, and the bottom surface of the pressing block is attached with a layer of cathode gold sheet; the membrane cap middle part trompil is installed and is passed through the oxygen membrane, and connecting pipe both ends opening and inside cavity to it has electrolyte to pour into at its inside, and the connecting pipe upper end inlays and is equipped with the silica gel gasket sealed with the electrolyte, packs heat conduction epoxy in the sheath, and the cathode structure upper end is passed the silica gel gasket and is arranged in heat conduction epoxy, inlays in this heat conduction epoxy and is equipped with the temperature electrode of being connected with the shielded conductor.

Preferably, the bottom surface of the pressing block is of an arc spherical structure, a through hole is formed in the middle of the bottom surface of the cathode shell, and the cathode gold sheet is attached to the pressing block and protrudes from the through hole.

Preferably, one end of the sheath is inserted into the shell and is in threaded connection with the inner wall of the shell, the other end of the sheath is sleeved on the connecting pipe and is in threaded connection with the outer wall of the connecting pipe, and the sheath is made of 316L stainless steel materials.

Preferably, the thickness of the cathode gold sheet is 0.2 mm.

Preferably, the surface of the cathode structure is spirally wound with a silver wire with the diameter of 0.8mm, and the cathode structure is connected with the shielding lead through a signal lead arranged in the shell.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model takes the large-area gold sheet as the cathode, and the current signal response is large, stable, fast and oxidation resistant; the cathode structure of the electrode is manufactured by pressing and connecting the cathode outer shell, the gold sheet and the cathode inner shell through threads, so that the contact area is large, the liquid is not leaked, the service life is long, the signal stability is good, the liquid leakage problem can be avoided, the liquid storage space of the electrolyte is large, the liquid is not required to be frequently replaced and calibrated, and the electrode can be used for on-line monitoring of trace oxygen in boiler water for a long time; the structure is simple to assemble, is beneficial to digital integration, and can reduce the cost of the whole equipment.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic structural diagram of a cathode structure according to the present invention.

In the figure: 1. a housing; 2. a fluorine rubber plug; 3. a shielded wire; 4. a connecting pipe; 5. a membrane cap; 6. a cathode inner casing; 7. a cathode housing; 8. a compression block; 9. cathode gold flakes; 10. a through hole; 11. an oxygen permeable membrane; 12. an electrolyte; 13. a silica gel gasket; 14. silver wire; 15. a thermally conductive epoxy resin; 16. a temperature electrode; 17. a signal lead; 18. a sheath.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to fig. 1-2, the present invention provides a technical solution: an online polarographic trace dissolved oxygen electrode comprises a shell 1, wherein one end of the shell 1 is embedded with a fluorine rubber plug 2, a shielding wire 3 is fixed in the fluorine rubber plug 2, the other end of the shell 1 is connected with a connecting pipe 4 through a sheath 18, and the outer end of the connecting pipe 4 is inserted into a membrane cap 5 in a threaded manner; a cathode structure is arranged in the connecting pipe 4, the cathode structure comprises a cathode inner shell 6 and a cathode outer shell 7, the cathode inner shell 6 is inserted into the cathode outer shell 7, the lower end of the cathode inner shell is provided with a pressing block 8 arranged in the cathode outer shell 7, the pressing block 8 is in threaded connection with the inner wall of the cathode outer shell 7, and the bottom surface of the cathode inner shell is attached with a layer of cathode gold sheet 9; the middle part of the membrane cap 5 is provided with a hole and is provided with an oxygen permeation membrane 11, the two ends of the connecting pipe 4 are open and are hollow, electrolyte 12 is injected into the connecting pipe 4, the upper end of the connecting pipe 4 is embedded with a silica gel gasket 13 for sealing the electrolyte 12, the sheath 18 is filled with heat conduction epoxy resin 15, the upper end of the cathode structure penetrates through the silica gel gasket 13 and is arranged in the heat conduction epoxy resin 15, and a temperature electrode 16 connected with the shielding lead 3 is embedded in the heat conduction epoxy resin 15.

Furthermore, the bottom surface of the pressing block 8 is of an arc spherical surface structure, a through hole 10 is formed in the middle of the bottom surface of the cathode shell 7, and the cathode gold sheet 9 is attached to the pressing block 8 and protrudes from the through hole 10.

Further, one end of the sheath 18 is inserted into the housing 1 and is in threaded connection with the inner wall thereof, the other end is sleeved on the connecting pipe 4 and is in threaded connection with the outer wall thereof, and the sheath 18 is made of 316L stainless steel material.

Further, the thickness of the cathode gold sheet 9 is 0.2 mm.

Further, a silver wire 14 with a diameter of 0.8mm is spirally wound on the surface of the cathode structure, and the cathode structure is connected with the shielding lead 3 through a signal lead 17 arranged in the shell 1.

The utility model takes the large-area gold sheet as the cathode, and the current signal response is large, stable, fast and oxidation resistant; the cathode outer shell 7, the cathode gold sheet 9 and the cathode inner shell 6 are in threaded pressing connection to manufacture a cathode structure of the electrode, and the contact area is large; the connecting pipe 4 is used for connection, liquid is not leaked, the service life is long, the signal stability is good, the liquid leakage problem can be avoided, the liquid storage space of the electrolyte 12 is large, liquid does not need to be frequently replaced and calibrated, and the electrolyte can be used for on-line monitoring of trace oxygen in boiler water for a long time; the structure is simple to assemble, is beneficial to digital integration, and can reduce the cost of the whole equipment.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (5)

1. An online polarographic trace dissolved oxygen electrode comprises a shell (1) and is characterized in that one end of the shell (1) is embedded with a fluorine rubber plug (2), a shielding lead (3) is fixed in the fluorine rubber plug (2), the other end of the shell (1) is connected with a connecting pipe (4) through a sheath (18), and the outer end of the connecting pipe (4) is inserted into a membrane cap (5) in a threaded manner; a cathode structure is arranged in the connecting pipe (4), the cathode structure comprises a cathode inner shell (6) and a cathode outer shell (7), the cathode inner shell (6) is inserted into the cathode outer shell (7), the lower end of the cathode inner shell is provided with a pressing block (8) arranged in the cathode outer shell (7), the pressing block (8) is in threaded connection with the inner wall of the cathode outer shell (7), and the bottom surface of the pressing block is attached with a layer of cathode gold sheet (9); the membrane cap (5) middle part trompil is installed and is passed through oxygen membrane (11), connecting pipe (4) both ends opening and inside cavity to it has electrolyte (12) to pour into in its inside, and connecting pipe (4) upper end inlays and is equipped with silica gel gasket (13) sealed with electrolyte (12), packs heat conduction epoxy (15) in sheath (18), and the negative pole structure upper end is passed silica gel gasket (13) and is arranged in heat conduction epoxy (15), and this heat conduction epoxy (15) are embedded to be equipped with and are shielded temperature electrode (16) that wire (3) are connected.

2. The online polarographic micro-dissolved oxygen electrode according to claim 1, characterized in that: the bottom surface of the pressing block (8) is of an arc spherical structure, a through hole (10) is formed in the middle of the bottom surface of the cathode shell (7), and the cathode gold sheet (9) is attached to the pressing block (8) and protrudes from the through hole (10).

3. The online polarographic micro-dissolved oxygen electrode according to claim 1, characterized in that: one end of the sheath (18) is inserted into the shell (1) and is in threaded connection with the inner wall of the shell, the other end of the sheath is sleeved on the connecting pipe (4) and is in threaded connection with the outer wall of the connecting pipe, and the sheath (18) is made of 316L stainless steel materials.

4. The online polarographic micro-dissolved oxygen electrode according to claim 1, characterized in that: the thickness of the cathode gold sheet (9) is 0.2 mm.

5. The online polarographic micro-dissolved oxygen electrode according to claim 1, characterized in that: and a silver wire (14) with the diameter of 0.8mm is spirally wound on the surface of the cathode structure, and the cathode structure is connected with the shielding lead (3) through a signal lead (17) arranged in the shell (1).

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