An electrode assembly structure for a sensor for measuring low-concentration oxygen in molten steel

Abstract

The present invention relates to an electrode assembly structure for a sensor for measuring low-concentration oxygen in molten steel, comprising a solid electrolyte ceramic tube (1), one end of which is provided with a molten steel contact surface (11), a cavity (12) is provided inside, an oxide reference electrode (2) is provided in the cavity (12), the other end of the solid electrolyte ceramic tube (1) is connected to a cement sealing layer (3), a reference electrode lead (4) is provided in the oxide reference electrode (2), one end of the reference electrode lead (4) passes through the cement sealing layer (3) and extends out of the oxide reference electrode (2); a metal electrode film (5) is provided on the molten steel contact surface (11) of the solid electrolyte ceramic tube (1), the metal electrode film (5) is connected to a working electrode lead, and the working electrode lead is provided outside the solid electrolyte ceramic tube (1). The present invention has the advantages of avoiding interference of the heat flow of molten steel on the sensor signal and improving the detection lower limit of the sensor.

Description

Technical Field

[0001] The invention relates to the technical field of oxygen sensor electrodes, in particular to an electrode assembly structure for a sensor for measuring low-concentration oxygen in molten steel. Background Art

[0002] The use of zirconia solid electrolyte oxygen sensors plays an important role in steel metallurgy. At present, this type of sensor mainly uses molten steel as the working electrode of the sensor during use. Since the molten steel is in a high-temperature flowing state during the measurement process, it will cause certain deviations in the measurement results, especially affecting the measurement of low-concentration oxygen. Summary of the invention

[0003] The purpose of the present invention is to solve the problems of measurement deviation and inaccurate low-concentration oxygen measurement results of existing solid electrolyte oxygen sensors, and to provide an electrode assembly structure for a sensor for low-concentration oxygen measurement in molten steel, thereby avoiding the interference of thermal flow of molten steel on the sensor signal and improving the detection limit of the sensor.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] An electrode assembly structure for a sensor for measuring low-concentration oxygen in molten steel comprises a solid electrolyte ceramic tube, one end of which is provided with a molten steel contact surface, a cavity is provided in the solid electrolyte ceramic tube, an oxide reference electrode is provided in the cavity, and the other end of the solid electrolyte ceramic tube is connected to a cement sealing layer, which is arranged opposite to the cavity to seal the oxide reference electrode in the cavity;

[0006] A reference electrode lead is arranged in the oxide reference electrode, and one end of the reference electrode lead passes through the cement sealing layer and extends out of the oxide reference electrode;

[0007] A metal electrode film is provided on the steel liquid contact surface of the solid electrolyte ceramic tube, and the metal electrode film is connected to a working electrode lead wire, which is provided outside the solid electrolyte ceramic tube to output a sensor signal together with the working electrode and the reference electrode.

[0008] Furthermore, the working electrode lead is configured as an externally coated electrode lead or a coated electrode lead.

[0009] Furthermore, one end of the externally coated electrode lead is connected to the metal electrode film, and the other end is downward and does not contact the outer surface of the solid electrolyte ceramic tube.

[0010] Furthermore, one end of the coated electrode lead is connected to the metal electrode film, and the coated electrode lead extends downward along the outer wall of the solid electrolyte ceramic tube, and the other end thereof is flush with the end surface of the solid electrolyte ceramic tube.

[0011] Furthermore, the molten steel contact surface of the solid electrolyte ceramic tube is provided as an outwardly protruding arched section, a protruding cylindrical section is provided in the middle of the arched section, and the diameter of the cylindrical section is smaller than the diameter of the solid electrolyte ceramic tube.

[0012] Furthermore, the externally coated electrode lead is a platinum wire.

[0013] Furthermore, the coated electrode lead is a platinum film provided on the surface of the solid electrolyte ceramic tube.

[0014] Furthermore, the metal electrode film is a noble metal electrode.

[0015] In the technical solution of the present invention, by coating a precious metal electrode on the outside of a ceramic tube, then connecting a platinum wire or a platinum film to the coated electrode, and leading out a working electrode as a sensor, the sensor signal can be output together with the reference electrode. The motor assembly structure of the present invention largely avoids the interference of the heat flow of molten steel on the sensor signal, improves the detection limit of the sensor, and improves the accuracy of the low-concentration oxygen measurement result. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a diagram of the electrode assembly structure of the externally coated electrode lead of the present invention;

[0017] Figure 2 This is a diagram of the electrode assembly structure of the present invention with a coated electrode lead. DETAILED DESCRIPTION

[0018] Example 1

[0019] To make the present invention more clearly understood, the electrode assembly structure of a sensor for measuring low-concentration oxygen in molten steel according to the present invention is further described below. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] See also Figure 1 and Figure 2 , an electrode assembly structure for a sensor for measuring low-concentration oxygen in molten steel, comprising a solid electrolyte ceramic tube 1, one end of which is provided with a molten steel contact surface 11, a cavity 12 is provided in the solid electrolyte ceramic tube 1, an oxide reference electrode 2 is provided in the cavity 12, and the other end of the solid electrolyte ceramic tube 1 is connected to a cement sealing layer 3, which is arranged facing the cavity 12, and is characterized in that:

[0021] A reference electrode lead 4 is provided inside the oxide reference electrode 2, and one end of the reference electrode lead 4 passes through the cement sealing layer 3 and extends out of the oxide reference electrode 2;

[0022] The molten steel contact surface 11 of the solid electrolyte ceramic tube 1 is set as an outwardly protruding arch section 11a, and a protruding cylindrical section 11b is provided in the middle of the arch section 11a, and the diameter of the cylindrical section 11b is smaller than the diameter of the solid electrolyte ceramic tube 1;

[0023] A metal electrode film 5 is provided on the steel liquid contact surface 11. The metal electrode film 5 is a noble metal electrode. The metal electrode film 5 is connected to a working electrode lead. The working electrode lead is provided outside the solid electrolyte ceramic tube 1 to output a sensor signal together with the working electrode and the reference electrode.

[0024] The working electrode lead is set as an externally coated electrode lead 6 or a coated electrode lead 7;

[0025] See also Figure 1 The externally coated electrode lead 6 is a platinum wire, one end of which is connected to the metal electrode film 5, and the other end is downward and does not contact the outer surface of the solid electrolyte ceramic tube 1;

[0026] See also Figure 2 The coated electrode lead 7 is a platinum film arranged on the surface of the solid electrolyte ceramic tube 1, one end of which is connected to the metal electrode film 5, and the coated electrode lead 7 extends downward along the outer wall of the solid electrolyte ceramic tube 1, and the other end of which is flush with the end surface of the solid electrolyte ceramic tube 1.

[0027] The electrode assembly structure of the present invention proposes coating a precious metal electrode on the outside of a ceramic tube, then connecting a platinum wire or a platinum film to the coated electrode, and leading out a working electrode as a sensor, which can output a sensor signal together with a reference electrode.

[0028] The device of the present invention greatly avoids the interference of the heat flow of molten steel on the sensor signal and improves the detection lower limit of the sensor.

[0029] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. An electrode assembly structure for a sensor for measuring low-concentration oxygen in molten steel, comprising a solid electrolyte ceramic tube (1), one end of the solid electrolyte ceramic tube (1) being provided with a molten steel contact surface (11), a cavity (12) being provided in the solid electrolyte ceramic tube (1), an oxide reference electrode (2) being provided in the cavity (12), and the other end of the solid electrolyte ceramic tube (1) being connected with a cement sealing layer (3), the cement sealing layer (3) being provided facing the cavity (12), characterized in that: A reference electrode lead (4) is provided inside the oxide reference electrode (2), and one end of the reference electrode lead (4) passes through the cement sealing layer (3) and extends out of the oxide reference electrode (2); A metal electrode film (5) is provided on the steel liquid contact surface (11) of the solid electrolyte ceramic tube (1), the metal electrode film (5) is connected to a working electrode lead, the working electrode lead is provided outside the solid electrolyte ceramic tube (1), and the metal electrode film (5) is a noble metal electrode; The molten steel contact surface (11) of the solid electrolyte ceramic tube (1) is provided as an outwardly protruding arched section (11a), a protruding cylindrical section (11b) is provided in the middle of the arched section (11a), and the diameter of the cylindrical section (11b) is smaller than the diameter of the solid electrolyte ceramic tube (1).

2. The electrode assembly structure of the sensor for measuring low-concentration oxygen in molten steel according to claim 1, characterized in that: The working electrode lead is configured as an externally coated electrode lead (6) or a coated electrode lead (7).

3. The electrode assembly structure of the sensor for measuring low-concentration oxygen in molten steel according to claim 2, characterized in that: One end of the externally coated electrode lead (6) is connected to the metal electrode film (5), and the other end is downward and does not contact the outer surface of the solid electrolyte ceramic tube (1).

4. The electrode assembly structure of the sensor for measuring low-concentration oxygen in molten steel according to claim 2, characterized in that: One end of the coated electrode lead (7) is connected to the metal electrode film (5), and the coated electrode lead (7) extends downward along the outer wall of the solid electrolyte ceramic tube (1), and the other end is flush with the end surface of the solid electrolyte ceramic tube (1).

5. The electrode assembly structure of the sensor for measuring low-concentration oxygen in molten steel according to claim 2 or 3, characterized in that: The externally coated electrode lead (6) is a platinum wire.

6. The electrode assembly structure of the sensor for measuring low-concentration oxygen in molten steel according to claim 2 or 4, characterized in that: The coated electrode lead (7) is a platinum film provided on the surface of the solid electrolyte ceramic tube (1).

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