A high pressure oxygen sensor

Abstract

The present invention discloses a high-pressure oxygen sensor, comprising a four-hole ceramic tube and a thermocouple. The thermocouple is installed on the periphery of the four-hole ceramic tube. A corundum tube is arranged on the periphery of the thermocouple. A zirconia sheet is installed on the outer side of the corundum tube through a sealing ring. The left and right sides of the zirconia sheet are respectively connected with a zirconia inner electrode and a zirconia outer electrode. A movable top pipe is arranged on the right side of the zirconia outer electrode. The present invention adopts a movable double-electrode contact method in structure, which can meet the minimum measurement of micro-oxygen 10 ‑30 The linear repeatability is of the order of magnitude of ±0.2% and the reaction speed is 0.05 milliseconds, which solves the problem that there are no similar products on the market that cannot monitor the oxygen content in high-pressure environments in special industries, especially the third and fourth generation nuclear power units that need to monitor the oxygen content in heat exchange steam under high temperature and high pressure environments, as well as the problem of micro-oxygen monitoring in high-pressure protective gas during special steel smelting.

Description

Technical Field

[0001] The invention relates to the technical field of measuring and controlling trace oxygen under high pressure, in particular to a high-pressure oxygen sensor. Background Art

[0002] At present, the oxygen measurement systems on the market all assume a standard atmospheric pressure and convert the oxygen content into percentage according to the Nernst law. The existing oxygen measurement system uses zirconium oxide for measurement. Because zirconium oxide (ZrO) is very fragile in a high temperature environment and will burst under pressure, it cannot work under high pressure. In addition, due to processing technology problems, the existing oxygen measurement sensors are all processed into test tube shapes (see Figure 1 ), in a high-pressure environment, the test-tube oxygen sensor is squeezed and broken, resulting in the inability to measure. Therefore, when using the existing oxygen measurement technology, when measuring high-pressure gas, the measured gas is generally led to the measuring tank for decompression measurement, which causes deviation and authenticity of the measured data, and fails to achieve a linear relationship with the actual measured data. In some industrial applications, when it is necessary to truly reflect the oxygen content in the measured gas under high pressure, the existing oxygen measurement system cannot complete the measurement.

[0003] With the country's demand for new energy and new material synthesis processes, there is an increasingly urgent need to truly monitor the oxygen content in the gas under high temperature and high pressure environments. This is the key to whether the product quality and oxygen content parameter indicators in process synthesis meet the standards. Therefore, there is an urgent need for a sensor that can accurately measure oxygen content in a high-pressure environment. Summary of the invention

[0004] The object of the present invention is to provide a high pressure oxygen sensor to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A high-pressure oxygen sensor comprises a four-hole ceramic tube and a thermocouple, wherein the thermocouple is installed in an inner core of the four-hole ceramic tube, a corundum tube is arranged on the periphery of the thermocouple, a zirconia sheet is installed on the outer side of the corundum tube via a sealing ring, a zirconia inner electrode and a zirconia outer electrode are connected to the left and right sides of the zirconia sheet respectively, a movable top pipe is arranged on the right side of the zirconia outer electrode, a probe heater is installed on the outer side of the movable top pipe and the corundum tube, a heater insulation sleeve is installed on the outer side of the probe heater, a zirconia probe housing is installed on the periphery of the heater insulation sleeve, a probe mounting screw buckle is provided on the left side of the zirconia probe housing, a pressure plate is installed on the left side of the probe mounting screw buckle, a zirconium tube spring and an electrode spring are installed between the left side of the zirconia sheet and the zirconia sheet inner electrode and the pressure plate respectively.

[0007] Preferably, a movable top sleeve is installed on the right side of the movable top pipe.

[0008] Preferably, a top sleeve spring is provided between the movable top sleeve and the movable top pipe.

[0009] Preferably, a probe thermocouple and a zirconia inner electrode wire are connected to the left side of the thermocouple.

[0010] Preferably, a probe heater wire is connected to the left side of the probe heater.

[0011] Preferably, a secondary instrument oxygen analyzer is connected below the probe mounting screw thread through a pressure sensor.

[0012] Preferably, a calibration and dust-cleaning gas input port is provided at the upper right corner of the pressure sensor.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The present invention adopts a movable double-electrode contact method in structure, which can meet the minimum measurement of micro oxygen 10 -30 The linear repeatability is of the order of magnitude of ±0.2% and the reaction speed is 0.05 milliseconds, which solves the problem that there are no similar products on the market that cannot monitor the oxygen content in high-pressure environments in special industries, especially the third and fourth generation nuclear power units that need to monitor the oxygen content in heat exchange steam under high temperature and high pressure environments, as well as the problem of micro-oxygen monitoring in high-pressure protective gas during special steel smelting. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an oxygen measuring sensor in the prior art.

[0016] Figure 2 It is a structural schematic diagram of the present invention;

[0017] Figure 3 It is a schematic diagram of the working principle of the present invention;

[0018] In the figure: 1-probe thermocouple and zirconia inner electrode wire; 2-probe heater wire; 3-electrode spring; 4-zirconium tube spring; 5-pressure plate; 6-secondary instrument oxygen analyzer; 7-pressure sensor; 8-calibration and dust removal gas inlet; 9-sealing ring; 10-probe installation screw buckle; 11-four-hole ceramic tube; 12-zirconia probe housing; 13-corundum tube; 14-heater insulation sleeve; 15-thermocouple; 16-zirconia sheet; 17-probe heater; 18-zirconia outer electrode; 19-movable top pipe; 20-movable top sleeve; 21-top sleeve spring; 22-zirconia inner electrode. DETAILED DESCRIPTION

[0019] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0020] See also Figure 1-3 A high-pressure oxygen sensor comprises a four-hole ceramic tube 11 and a thermocouple 15, wherein the thermocouple 15 is installed on the periphery of the four-hole ceramic tube 11, a corundum tube 13 is arranged on the periphery of the thermocouple 15, a zirconia sheet 16 is installed on the outside of the corundum tube 13 through a sealing ring 9, a zirconia inner electrode 22 and a zirconia outer electrode 18 are connected to the left and right sides of the zirconia sheet respectively, a movable top pipe 19 is arranged on the right side of the zirconia outer electrode 18, a probe heater 17 is installed on the outside of the movable top pipe 19 and the corundum tube 13, a heater insulation sleeve 14 is installed on the outside of the probe heater 17, a zirconia probe housing 12 is installed on the periphery of the heater insulation sleeve 14, a probe mounting screw thread buckle 10 is arranged on the left side of the zirconia probe housing 12, a pressure plate 5 is installed on the left side of the probe mounting screw thread buckle 10, a zirconium tube spring 4 and an electrode spring 3 are installed between the left side of the zirconia sheet 16 and the zirconia sheet inner electrode 22 and the pressure plate 5 respectively.

[0021] A movable top sleeve 20 is installed on the right side of the movable top pipe 19, and a top sleeve spring 21 is arranged between the movable top sleeve 20 and the movable top pipe 19. The left side of the thermocouple 15 is connected to the probe thermocouple and the zirconia inner electrode wire 1, and the left side of the probe heater 17 is connected to the probe heater wire 2. The lower part of the probe mounting screw thread buckle 10 is connected to the secondary instrument oxygen analyzer 6 through the pressure sensor 7. The upper right corner of the pressure sensor 7 is provided with a calibration and dust removal gas input port 8.

[0022] The working principle of the high-pressure oxygen sensor is as follows: when the oxygen sensor is directly inserted into the gas pipeline or tank to be measured, as the pressure of the pipeline or tank increases, the movable top sleeve 20 is pressed by the pressure to push the top sleeve spring 21 to compress. When the gas pressure is greater than the rebound force, the top sleeve spring 21 pushes the movable top tube 19 to move to the left only against the zirconia outer electrode 18 and the zirconia sheet 16, thereby driving the left side of the zirconium tube spring 4 and the electrode spring 3 to press tightly, the zirconia sheet inner electrode 22 and the zirconia sheet 16 to move synchronously, and the zirconia outer electrode 18 is tightly against the zirconia sheet 16, ensuring that the zirconia sheet inner electrode 22 and the zirconia outer electrode 18 maintain contact signal (mV) transmission. If the pressure decreases or negative pressure occurs, the zirconia outer electrode 18 releases the compression force, the zirconium tube spring 4 and the electrode spring release the elastic force to move to the right, and the whole moves to the right to maintain the signal transmission of the zirconia sheet inner electrode 22 and the zirconia outer electrode 18. In the present invention, the inner and outer sides of the zirconia sheet 16 are supported by electrodes, and the zirconia sheet 16 and the inner and outer electrodes are movable. In a high-pressure environment, the spring can contract differently according to the pressure. The tightness of the spring is related to the pressure, ensuring that the zirconia sheet 16 always maintains signal transmission. In addition, because the contact force surface of the zirconia sheet 16 is very small, the impact surface of the high-pressure airflow is very small, and the two sides are supported by electrodes, the zirconia sheet 16 and the inner and outer electrodes are pressed and moved synchronously to form a whole, which is not easy to break.

[0023] The pressure sensor 7 can select different measuring ranges according to the working environment requirements, and can arbitrarily select the measuring range within the range of -100KPa to 1000KPa. The pressure sensor 7 receives the pressure signal and transmits it to the secondary instrument oxygen analyzer 6 through the 4-20mA pressure signal. The secondary instrument oxygen analyzer 6 calculates the oxygen content percentage by using the Nernst oxygen content formula to calculate the oxygen content percentage.

[0024] The invention has low cost and is easy to use. It can save complicated auxiliary decompression devices, save a lot of auxiliary device costs and use costs, and realize real-time synchronous measurement of linear oxygen parameters. It is very important for nuclear energy heat exchange, polymer material synthesis, and rare earth metal smelting. It has a wide range of applications and can be used in environments ranging from vacuum to 10 standard atmospheric pressures. One sensor solves the measurement of two different environments. It can be widely used in nuclear boilers, new material synthesis, rare earth ductile iron powder sintering, chemical material synthesis, electronic device material forming and other technical fields that require measurement and control of trace oxygen under high pressure.

Claims

1. A high-pressure oxygen sensor, comprising a four-hole ceramic tube (11) and a thermocouple (15), wherein the thermocouple (15) is installed on the periphery of the four-hole ceramic tube (11), and a corundum tube (13) is arranged on the periphery of the thermocouple (15), characterized in that: A zirconia sheet (16) is installed on the outer side of the corundum tube (13) via a sealing ring (9); the left and right sides of the zirconia sheet are respectively connected to a zirconia inner electrode (22) and a zirconia outer electrode (18); a movable top pipe (19) is arranged on the right side of the zirconia outer electrode (18); a probe heater (17) is installed on the outer side of the movable top pipe (19) and the corundum tube (13); a heater insulation sleeve (14) is installed on the outer side of the probe heater (17); a zirconia probe housing (12) is installed on the periphery of the heater insulation sleeve (14); a probe mounting screw buckle (10) is provided on the left side of the zirconia probe housing (12); a pressure plate (5) is installed on the left side of the probe mounting screw buckle (10); and a zirconium tube spring (4) and an electrode spring (3) are respectively installed between the left side of the zirconia sheet (16) and the zirconia sheet inner electrode (22) and the pressure plate (5).

2. The high pressure oxygen sensor according to claim 1, characterized in that: A movable top sleeve (20) is installed on the right side of the movable top pipe (19).

3. The high pressure oxygen sensor according to claim 2, characterized in that: A top sleeve spring (21) is provided between the movable top sleeve (20) and the movable top pipe (19).

4. The high pressure oxygen sensor according to claim 1, characterized in that: The left side of the thermocouple (15) is connected to a probe thermocouple and a zirconia inner electrode wire (1).

5. The high pressure oxygen sensor according to claim 1, characterized in that: The left side of the probe heater (17) is connected to a probe heater wire (2).

6. The high pressure oxygen sensor according to claim 1, characterized in that: A secondary instrument oxygen analyzer (6) is connected below the probe mounting screw thread buckle (10) via a pressure sensor (7).

7. The high pressure oxygen sensor according to claim 6, characterized in that: A calibration and dust-cleaning gas input port (8) is provided at the upper right corner of the pressure sensor (7).

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