Novel three-electrode conductivity measurement equipment

Abstract

The utility model 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 utility model 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 ) measures 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 calculates the conductivity according to Ohm's law.

[0003] In a traditional two-electrode sensor, 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 power of 12 ohms). Therefore, traditional two-electrode sensors often need to be cleaned and dried to reduce impurities remaining on the surface of the insulating bracket and increase the insulation strength of the insulating bracket surface. Therefore, a new three-electrode conductivity measurement device is proposed to solve the above problems. Utility Model Content

[0004] (1) Technical problems solved

[0005] To address the shortcomings of existing technologies, this utility model provides a new three-electrode conductivity measurement device with advantages such as improved measurement accuracy and maintenance-free cycle, eliminating the problem of interference current affecting measurement accuracy. To reduce interference current, the measuring electrodes place extremely high demands on the insulation of the inner and outer electrodes. Therefore, traditional two-electrode sensors often require cleaning and drying to reduce impurities remaining on the surface of the insulation bracket and enhance the insulation strength of the insulation bracket surface.

[0006] (2) Technical solution

[0007] The utility model provides a technical solution for solving the above-mentioned technical problems as follows: a new device for measuring three-electrode conductivity, comprising an end cap, wherein a conductivity cell is fixedly connected to the bottom of the end cap, an insulating bracket located within the conductivity cell is fixedly connected to the bottom of the end cap, and 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 to 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. An instrument transmitter is provided at the top of the end cap and connected thereto via a connecting column. The cylindrical outer electrode, the annular middle electrode, and the cylindrical inner electrode are all electrically connected to the instrument transmitter via a three-core wire.

[0008] Furthermore, the top of the end cover is threadedly connected to a first bolt 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 into the interior of the end cover.

[0010] Furthermore, the bottom and 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 utility model are:

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

[0014] Figure 1 This is a schematic diagram of the structure of the utility model;

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

[0016] Figure 3 This is a schematic diagram of the circuit structure of the utility model.

[0017] In the figure: 1. End cap; 2. Conductivity cell; 3. Insulating bracket; 4. Three-electrode sensor; 401. Cylindrical outer electrode; 402. Ring-shaped 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 embodiments described 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 making creative efforts 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 utility model includes an end cap 1. A conductivity cell 2 is fixedly connected to the bottom of the end cap 1. An insulating bracket 3 located within the conductivity cell 2 is fixedly connected to the bottom of the end cap 1. A three-electrode sensor 4 is connected to the insulating bracket 3. The three-electrode sensor 4 includes a cylindrical outer electrode 401, an annular middle electrode 402, and a cylindrical inner electrode 403. The outer side of the insulating bracket 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 cylindrical outer electrode 401, the annular middle electrode 402, and the cylindrical inner electrode 403 are insulated from each other. An instrument transmitter 6 is provided at the top of the end cap 1 and connected thereto 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.

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

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

[0022] The bottom and 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 a 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 bracket 3 to the cylindrical inner electrode 403 on the surface of the insulating bracket 3, thereby eliminating the interference current I2. This has the advantages of increasing measurement accuracy and maintenance-free cycle, and is more suitable for long-term online conductivity measurement. It 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 document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0027] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and 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 bracket (3) located in the conductivity cell (2), the insulating bracket (3) is connected to a three-electrode sensor (4), the three-electrode sensor (4) comprising a cylindrical outer electrode (401), an annular middle electrode (402) and a cylindrical inner electrode (403), and the outer side of the insulating bracket (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 cylindrical outer electrode (401), the annular intermediate electrode (402) and the cylindrical inner electrode (403) are insulated from each other. The top of the end cover (1) is provided with an instrument transmitter (6) connected to the top of the end cover (1) via a connecting column (5). The cylindrical outer electrode (401), the annular intermediate electrode (402) and the cylindrical inner electrode (403) are all electrically connected to the instrument transmitter (6) via a three-core wire (10).

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

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

5. The novel 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).

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