Novel three-electrode conductivity measurement equipment

Abstract

The invention relates to the technical field of oil conductivity monitoring, and discloses novel equipment for three-electrode conductivity measurement. The novel equipment for measuring the conductivity of the three electrodes comprises an end cover, the bottom of the end cover is fixedly connected with a conductance cell, the bottom of the end cover is fixedly connected with an insulation support located in the conductance cell, the insulation support is connected with a three-electrode sensor, the three-electrode sensor comprises a cylindrical outer electrode, an annular middle electrode and a cylindrical inner electrode, and the annular middle electrode is connected with the cylindrical inner electrode. The device has the advantages that the measurement accuracy is improved, the maintenance-free period is prolonged, and the problem that interference current influences the measurement accuracy is solved. According to a traditional dual-electrode sensor, cleaning and drying equipment is often needed to reduce residual and attached impurities on the surface of an insulating support, and the problem that the insulating strength between an inner electrode and an outer electrode is reduced is solved. The three-electrode sensor effectively solves the problem of interference current caused by reduction of surface resistance between the inner electrode and the outer electrode, the measurement accuracy is improved, and the maintenance period is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of oil conductivity monitoring, in particular to a new device for measuring three-electrode conductivity. Background Art

[0002] Conventional two-electrode sensors (see Figure 2 ) is to measure the current passing through the measured medium by applying an electrical signal between the outer electrodes and detecting the received signal at the inner electrode, and then calculate the conductivity according to Ohm's law.

[0003] In traditional two-electrode sensors, part of the current I0 received by the inner electrode is the current I1 obtained by the signal generating end flowing from the outer electrode through the measured medium to the inner electrode, and the other part is the interference current I2 leaking through the surface of the insulator between the fixed outer electrode and the inner electrode. Therefore, the actual measured current I0 = I1 + I2, where I2 is the interference current, which affects the measurement accuracy. In order to reduce the interference current I2, the measuring electrode has extremely high requirements for the insulation between the inner and outer electrodes (the insulation resistance of oil measurement is usually greater than 10 to the 12th power ohms). Therefore, traditional two-electrode sensors often need to be cleaned and dried to reduce the impurities remaining on the surface of the insulating bracket to increase the insulation strength of the insulating bracket surface. Therefore, a new three-electrode conductivity measurement device is proposed to solve the above problems. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the shortcomings of the prior art, the present invention provides a new device for measuring three-electrode conductivity, which has the advantages of improving measurement accuracy and maintenance-free cycle, and solves the problem of interference current affecting measurement accuracy. In order to reduce interference current, the measuring electrode has extremely high requirements for the insulation of the inner and outer electrodes, so the traditional two-electrode sensor often needs to be cleaned and dried to reduce the impurities remaining on the surface of the insulating bracket to enhance the insulation strength of the insulating bracket surface.

[0006] (II) Technical solution

[0007] The technical solution of the present invention to solve the above technical problems is as follows: a new device for measuring three-electrode conductivity, comprising an end cover, a conductivity cell is fixedly connected to the bottom of the end cover, an insulating bracket located in the conductivity cell is fixedly connected to the bottom of the end cover, a three-electrode sensor is connected to the insulating bracket, the three-electrode sensor comprises a cylindrical outer electrode, an annular middle electrode and a cylindrical inner electrode, the outer side of the insulating bracket is fixedly connected with the cylindrical outer electrode, the annular middle electrode and the cylindrical inner electrode in sequence from the outside to the inside, the cylindrical outer electrode, the annular middle electrode and the cylindrical inner electrode are insulated from each other, the top of the end cover is provided with an instrument transmitter connected to the top of the end cover through a connecting column, and the cylindrical outer electrode, the annular middle electrode and the cylindrical inner electrode are all electrically connected to the instrument transmitter through a three-core wire.

[0008] Furthermore, the top of the end cover is threadedly connected with first bolts distributed in a ring array and extending into the interior of the conductivity cell.

[0009] Furthermore, the bottom of the insulating bracket is threadedly connected with second bolts distributed in a ring array and extending to the interior of the end cover.

[0010] Furthermore, the bottom and the outer side of the conductivity cell are respectively provided with oil inlet and outlet holes communicating with the interior thereof.

[0011] Furthermore, the three-electrode sensor is electrically connected to the signal sending end, signal ground GND and signal receiving end of the instrument transmitter through three-core wires, wherein the cylindrical outer electrode is electrically connected to the signal sending end of the instrument transmitter through the three-core wires, the annular middle electrode is electrically connected to the signal ground GND of the instrument transmitter through the three-core wires, and the cylindrical inner electrode is electrically connected to the signal receiving end of the instrument transmitter through the three-core wires.

[0012] The beneficial effects of the present invention are:

[0013] This new three-electrode conductivity measurement equipment adds a ring-shaped middle electrode between the cylindrical outer electrode and the cylindrical inner electrode. The cylindrical outer electrode is connected to the instrument signal sending end, the ring-shaped middle electrode is connected to the signal ground GND, and the cylindrical inner electrode is connected to the instrument signal receiving end. The ring-shaped middle electrode blocks the transmission of the interference current I2 from the cylindrical outer electrode to the cylindrical inner electrode on the surface of the insulating bracket, eliminating the interference current I2, and has the advantages of improving the measurement accuracy and maintenance-free cycle, and is more suitable for long-term online conductivity measurement. Please see Figure 3 . BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention;

[0015] Figure 2 Schematic diagram of interference current I2 of traditional two-electrode sensor;

[0016] Figure 3 It is a schematic diagram of the circuit structure of the present invention.

[0017] In the figure: 1. end cover; 2. conductivity cell; 3. insulating bracket; 4. three-electrode sensor; 401. cylindrical outer electrode; 402. annular middle electrode; 403. cylindrical inner electrode; 5. connecting column; 6. instrument transmitter; 7. first bolt; 8. second bolt; 9. oil inlet and outlet holes; 10. three-core wire. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the embodiment, Figure 1-3 A new device for measuring three-electrode conductivity is provided. The invention comprises an end cover 1, a conductivity cell 2 is fixedly connected to the bottom of the end cover 1, an insulating support 3 located in the conductivity cell 2 is fixedly connected to the bottom of the end cover 1, a three-electrode sensor 4 is connected to the insulating support 3, and the three-electrode sensor 4 comprises a cylindrical outer electrode 401, an annular middle electrode 402 and a cylindrical inner electrode 403. The outer side of the insulating support 3 is fixedly connected with the cylindrical outer electrode 401, the annular middle electrode 402 and the cylindrical inner electrode 403 in sequence from the outside to the inside. The cylindrical outer electrode 401, the annular middle electrode 402 and the cylindrical inner electrode 403 are insulated from each other. An instrument transmitter 6 connected to the top of the end cover 1 through a connecting column 5 is provided on the top of the end cover 1, and the cylindrical outer electrode 401, the annular middle electrode 402 and the cylindrical inner electrode 403 are all electrically connected to the instrument transmitter 6 through a three-core wire 10.

[0020] The top of the end cover 1 is threadedly connected with first bolts 7 distributed in a ring array and extending into the conductivity cell 2;

[0021] The bottom of the insulating bracket 3 is threadedly connected with second bolts 8 distributed in a ring array and extending to the inside of the end cover 1;

[0022] The bottom and the outer side of the conductivity cell 2 are respectively provided with oil inlet and outlet holes 9 communicating with the interior thereof;

[0023] The three-electrode sensor is electrically connected to the signal sending end, signal ground GND and signal receiving end of the instrument transmitter 6 through the three-core wire 10, wherein the cylindrical outer electrode 401 is electrically connected to the signal sending end of the instrument transmitter 6 through the three-core wire 10, the annular middle electrode 402 is electrically connected to the signal ground GND of the instrument transmitter 6 through the three-core wire 10, and the cylindrical inner electrode 403 is electrically connected to the signal receiving end of the instrument transmitter 6 through the three-core wire 10.

[0024] Working principle:

[0025] An annular intermediate electrode 402 is added between the cylindrical outer electrode 401 and the cylindrical inner electrode 403, which blocks the transmission of the interference current I2 flowing from the cylindrical outer electrode 401 through the surface of the insulating support 3 to the cylindrical inner electrode 403 on the surface of the insulating support 3, eliminates the interference current I2, has the advantages of increasing the measurement accuracy and maintenance-free cycle, and is more suitable for long-term online conductivity measurement, and solves the technical problems of cumbersome and labor-intensive operations such as tank sampling, measurement, and blending during the factory blending of oil and antistatic agent.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new device for three-electrode conductivity measurement, comprising an end cap (1), characterized in that: The bottom of the end cover (1) is fixedly connected to a conductivity cell (2), the bottom of the end cover (1) is fixedly connected to an insulating support (3) located in the conductivity cell (2), the insulating support (3) is connected to a three-electrode sensor (4), the three-electrode sensor (4) comprises a cylindrical outer electrode (401), an annular middle electrode (402) and a cylindrical inner electrode (403), and the outer side of the insulating support (3) is fixedly connected to the cylindrical outer electrode (401), the annular middle electrode (402) and the cylindrical inner electrode (403) in sequence from the outside to the inside. The end cap (1) is provided with a cylindrical middle electrode (402) and a cylindrical inner electrode (403); the cylindrical outer electrode (401), the annular middle electrode (402) and the cylindrical inner electrode (403) are insulated from each other; the top of the end cap (1) is provided with an instrument transmitter (6) connected to the top of the end cap (1) via a connecting column (5); the cylindrical outer electrode (401), the annular middle electrode (402) and the cylindrical inner electrode (403) are all electrically connected to the instrument transmitter (6) via a three-core wire (10).

2. A new device for measuring three-electrode conductivity according to claim 1, characterized in that: The top of the end cover (1) is threadedly connected with first bolts (7) distributed in a ring array and extending into the interior of the conductivity cell (2).

3. A new device for three-electrode conductivity measurement according to claim 1, characterized in that: The bottom of the insulating bracket (3) is threadedly connected with second bolts (8) distributed in a ring array and extending to the interior of the end cover (1).

4. A new device for measuring three-electrode conductivity according to claim 1, characterized in that: The bottom and the outer side of the conductivity cell (2) are respectively provided with oil inlet and outlet holes (9) communicating with the interior thereof.

5. A new device for measuring three-electrode conductivity according to claim 1, characterized in that: The three-electrode sensor is electrically connected to the signal sending end, signal ground GND and signal receiving end of the instrument transmitter (6) through the three-core wire (10), wherein the cylindrical outer electrode (401) is electrically connected to the signal sending end of the instrument transmitter (6) through the three-core wire (10), the annular middle electrode (402) is electrically connected to the signal ground GND of the instrument transmitter (6) through the three-core wire (10), and the cylindrical inner electrode (403) is electrically connected to the signal receiving end of the instrument transmitter (6) through the three-core wire (10).

Images