Oil water content and temperature sensor applied to deep sea hydraulic system

Abstract

The invention belongs to the field of hydraulic system state monitoring, and particularly discloses an oil water content and temperature sensor applied to a deep sea hydraulic system. The sensor comprises a moisture content sensing module, a temperature sensing module, a watertight plug and a sensor shell, the sensor shell is in threaded connection with a to-be-detected pipeline, the watertight plug is in threaded connection with the sensor shell, and end face sealing is carried out through a sealing ring; a polar plate bracket in the moisture content sensing module is connected with a sensor shell through a set screw, and an outer polar plate is connected with the polar plate bracket through a set screw; the inner polar plate and the outer polar plate are matched with slots reserved on the polar plate bracket so as to realize positioning; the outer polar plate is connected with the tail end bracket through a buckle, so that the distance between the inner polar plate and the outer polar plate is kept unchanged when the polar plates are impacted by oil; a temperature probe in the temperature sensing module is mounted on the polar plate bracket through threaded connection; lead-out wires of the water content sensing module and the temperature sensing module are connected with contacts of the watertight plug and then connected with an external signal acquisition unit. The moisture content of hydraulic oil of a to-be-detected system is obtained through real-time detection of capacitance values of the coaxial inner and outer polar plates, and the temperature of the to-be-detected oil is obtained through a thermistor value in the temperature probe. The water content and the temperature can be measured on line at the same time, meanwhile, the reliability of the sensor working in a deep sea high-pressure hydraulic system can be guaranteed, high-precision measurement can be achieved, meanwhile, the structure is compact, and miniaturization of the hydraulic system is easy to achieve.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil water content detection, and more particularly to an oil water content and temperature sensor applied to a deep-sea hydraulic system. BACKGROUND

[0002] With the continuous development of science and technology and the gradual depletion of land resources, humans begin to explore the deep sea to seek new resources. Hydraulic systems are widely used in various underwater operating equipment and submersibles due to their high power-to-weight ratio, easy pressure compensation and other advantages.

[0003] Underwater operating equipment is long-term in seawater environment. The reciprocating motion of the isolation oil and water causes the sealing ring to be unable to achieve complete zero leakage, and oil-water interpenetration inevitably occurs, which causes the hydraulic oil to be contaminated. To ensure the normal operation of the hydraulic system, the oil needs to be replaced in time when the water content reaches a certain value.

[0004] The cylindrical inner electrode and the outer electrode form a coaxial capacitor. The oil flowing through the area acts as an insulating liquid, and the change in the capacitance value is linearly related to the dielectric constant of the insulating electric field between the inner and outer electrodes. The dielectric constant is related to the water content of the oil. Since the dielectric constant of hydraulic oil is about 2.3 and the dielectric constant of water is about 80, the equivalent dielectric constant of the oil-water mixture medium increases significantly with the increase of water content. Based on this, the detected capacitance value is converted into an oil water content signal by calibrating the capacitance value and the calibration curve of the oil water content, thereby realizing online real-time detection of the oil water content in the hydraulic system pipeline. It is simple to operate, and the detection cost is low and fast.

[0005] The existing oil water content sensor is mainly applied to the hydraulic system under normal pressure, and it is difficult to work stably in the deep-sea hydraulic system. Therefore, it is necessary to detect the oil water content in the pipeline of the deep-sea hydraulic system in real time to determine whether the hydraulic oil needs to be replaced. SUMMARY

[0006] In view of the above defects or improvement needs of the prior art, the present application provides an oil water content and temperature sensor applied to a deep-sea hydraulic system, wherein the sensor realizes pressure self-adaptive compensation under different sea depth pressures by filling oil in the sensor, so that it can work stably in the hydraulic system under different sea depth pressures, and realize temperature measurement while realizing water content detection, thereby providing a basis for the maintenance and decision-making of the hydraulic system.

[0007] To achieve the above purpose, the present application provides an oil water content and temperature sensor applied to a deep-sea hydraulic system, which comprises a water content sensing module, a temperature sensing module, a watertight connector and a sensor shell, wherein:

[0008] The moisture content sensing module includes an electrode plate support, an inner electrode plate, an outer electrode plate, and an end support. The inner and outer electrode plates are positioned by engaging with pre-reserved slots on the electrode plate support. The outer electrode plate is connected to the electrode plate support by set screws. The outer electrode plate is connected to the end support by snap-fit, which ensures that the distance between the inner and outer electrode plates remains constant when the electrode plates are impacted by oil. The moisture content and capacitance value of the coaxial inner and outer electrode plates are pre-calibrated, and then the moisture content of the hydraulic oil in the system under test is obtained by real-time detection of the capacitance value of the coaxial inner and outer electrode plates.

[0009] The temperature sensing module includes a temperature probe, which contains a thermistor and lead wires. The thermistor is fixed in a fixed position inside the temperature probe by using silicone potting. The temperature of the oil to be tested is obtained by the thermistor value inside the temperature probe.

[0010] As a further preferred embodiment, the sensor housing is connected to the pipeline under test and the watertight connector is connected to the sensor housing by threads, and the end face is sealed by a sealing ring, thereby sealing the oil under test from the external environment; the inside of the sensor housing is filled with oil to ensure that the sensor can achieve automatic pressure compensation under different sea depth pressures.

[0011] As a further preferred embodiment, when collecting the capacitance value between the inner and outer plates to calibrate the corresponding water content, the method also includes collecting the temperature of the oil to be tested and calculating to eliminate the influence of temperature on the water content measurement.

[0012] As a further preferred embodiment, the inner electrode plate and the outer electrode plate are coaxial cylindrical electrode plates, and multiple flow holes are provided on the walls of the inner electrode plate and the outer electrode plate, thereby reducing the oil flow resistance and enabling the oil between the inner electrode plate and the outer electrode plate to flow and replace quickly, ensuring the accuracy of the detection results.

[0013] As a further preferred embodiment, one end of the inner electrode plate and the outer electrode plate are connected to a pre-reserved groove on the electrode plate support, and the other end is connected to an end support to ensure that the spacing between the coaxial electrode plates remains unchanged. This ensures that the sensor remains structurally stable even when the hydraulic system has a large flow rate and the electrode plates are subjected to a large impact force, thereby guaranteeing measurement accuracy.

[0014] As a further preferred embodiment, the temperature probe is mounted on the electrode support via a threaded connection.

[0015] As a further preferred embodiment, the inner electrode plate and the outer electrode plate are made of copper, which has good electrical conductivity.

[0016] As a further preferred embodiment, the electrode plate support and the end support are made of insulating material.

[0017] In summary, compared with the prior art, the above-described technical solutions conceived by this invention mainly possess the following technical advantages:

[0018] 1. This invention enables the sensor to achieve adaptive pressure compensation under different sea depth and pressure conditions by filling the sensor with oil. This allows the sensor to work stably in hydraulic systems under different sea depth and pressure conditions, and to measure temperature while detecting water content, thus providing a basis for the maintenance and decision-making of hydraulic systems.

[0019] 2. This invention obtains the capacitance value in real time by using coaxially arranged external and internal electrodes, and obtains the water content of the oil in the current hydraulic system pipeline according to the capacitance-water content calibration curve. It can realize online detection, is easy to use, and provides accurate detection results with high precision and low cost.

[0020] 3. The inner and outer electrode plates are coaxially arranged. One end is connected to the groove reserved on the electrode plate support, and the other end is connected to the end support to keep the spacing of the coaxial electrode plates constant. This ensures that the sensor remains structurally stable even when the hydraulic system has a large flow rate and the electrode plates are subjected to a large impact force, thereby ensuring measurement accuracy. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an oil water content and temperature sensor for a deep-sea hydraulic system constructed according to a preferred embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the working scenario of an oil water content and temperature sensor for a deep-sea hydraulic system constructed according to a preferred embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the electrode plate support constructed according to a preferred embodiment of the present invention;

[0024] Figure 4 This is a top view of the electrode plate support constructed according to a preferred embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the outer electrode plate constructed according to a preferred embodiment of the present invention.

[0026] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0027] 1-Inner electrode plate, 2-Outer electrode plate, 2.1-Snap-in groove, 2.2-Flow passage hole, 2.3-Outer electrode plate mounting hole, 3-Test pipeline, 4-Outer electrode plate set screw, 5-Sensor housing, 5.1-Sensor housing sealing ring, 6-Watertight connector, 6.1-Watertight connector wire, 6.2-Watertight connector sealing ring, 7-Temperature probe, 7.1 Temperature probe lead wire, 7.2 Thermistor, 8-Electrode plate bracket, 8.1-Outer electrode plate mounting groove, 8.2-Inner electrode plate mounting groove, 8.3-Set screw threaded hole, 9-End bracket. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0029] like Figure 1 As shown, this embodiment of the invention provides an oil water content and temperature sensor for use in deep-sea hydraulic systems. The sensor comprises a water content sensing module, a temperature sensing module, a watertight connector, and a sensor housing, wherein:

[0030] The moisture content sensing module includes an electrode support 8, an inner electrode 1, an outer electrode 2, and an end support 9. The inner electrode 1 and the outer electrode 2 are positioned by engaging with the pre-reserved slots on the electrode support 8. The outer electrode 2 is connected to the electrode support 8 by an outer electrode set screw 4. The outer electrode 2 and the end support 9 are connected by a snap-fit, which ensures that the distance between the inner and outer electrode plates remains constant when the electrode plates are impacted by oil. The moisture content and capacitance value of the coaxial inner and outer electrode plates are pre-calibrated, and then the moisture content of the hydraulic oil in the system under test is obtained by real-time detection of the capacitance value of the coaxial inner and outer electrode plates.

[0031] The temperature sensing module includes a temperature probe 7, which contains a thermistor 7.2 and a temperature probe lead wire 7.1. The thermistor 7.2 is fixed in a fixed position inside the temperature probe by using silicone potting. The temperature of the oil to be tested is obtained by the thermistor value inside the temperature probe.

[0032] The sensor housing 5 is connected to the pipeline under test 3 and the watertight connector 7 is connected to the sensor housing 5 by threads, and the end face is sealed by a sealing ring, thereby sealing the oil under test from the external environment; the sensor housing 5 is filled with oil to ensure that the sensor can achieve automatic pressure compensation under different sea depth pressures.

[0033] Furthermore, such as Figure 2 As shown, during normal operation, the sensor housing 5 and the pipeline under test 3 are connected by threads and sealed by the sensor housing sealing ring 5.1. The signal under test inside the sensor is led out through the watertight connector wire 6.1 and thus connected to the signal acquisition circuit.

[0034] Furthermore, such as Figure 3 , 4As shown, the electrode plate bracket 8 includes a set screw threaded hole 8.3 for positioning and installation. At the same time, the electrode plate bracket 8 has an outer electrode plate mounting groove 8.1 for mounting the inner electrode plate 1 and an inner electrode plate mounting groove 8.2 for mounting the outer electrode plate 2. During installation, the inner and outer electrode plates are first placed into the mounting grooves, and then fixedly connected by the outer electrode plate set screw 4.

[0035] Furthermore, such as Figure 5 As shown, the outer electrode plate has multiple flow holes 2.2 on its wall surface, which reduces the resistance to oil flow and allows for rapid oil exchange between the inner electrode plate 1 and the outer electrode plate 2, ensuring the accuracy of the test results. One end of the outer electrode plate has an outer electrode plate mounting hole 2.3, which is used to cooperate with the outer electrode plate set screw 4 to position the outer electrode plate 2. The other end of the outer electrode plate 2 has a snap-fit ​​groove 2.1, which is used to cooperate with the snap-fit ​​reserved on the end bracket 9 to install the end bracket 9, thereby limiting the position of the inner electrode plate 1 and ensuring that the distance between the inner and outer electrode plates remains unchanged when subjected to oil impact force, thus ensuring the accuracy of the measurement results.

[0036] Furthermore, when calibrating the corresponding water content by collecting the capacitance value between the inner electrode plate 1 and the outer electrode plate 2, the temperature of the oil to be tested is also collected, and the influence of temperature on the water content measurement is eliminated through calibration and calculation.

[0037] Furthermore, the inner electrode plate 1 and the outer electrode plate 2 are made of highly conductive copper. The electrode plate support 8 and the end support 9 are made of insulating material.

[0038] The sensor structure in this embodiment can be applied to the detection needs of oil water content and temperature in hydraulic systems of various deep-sea equipment in all depths of the sea, and can also be used as a conventional oil water content and temperature sensor on land.

[0039] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An oil water cut and temperature sensor for use in a deep sea hydraulic system, characterized in that, The sensor comprises a water content sensing module, a temperature sensing module, a watertight connector and a sensor shell, wherein: The water content sensing module comprises a polar plate support (8), an inner polar plate (1), an outer polar plate (2) and a terminal support (9); the inner polar plate (1) and the outer polar plate (2) are positioned by cooperating with the reserved slot on the polar plate support (8); the outer polar plate (2) is connected with the polar plate support (8) through an outer polar plate fixing screw (4); the outer polar plate (2) is connected with the terminal support (9) through a buckle, so that the inner and outer polar plates can keep the same distance when impacted by oil; the water content and the capacitance value of the coaxial inner and outer polar plates are calibrated in advance, and then the water content of the hydraulic oil to be measured is obtained through real-time detection of the capacitance value of the coaxial inner and outer polar plates. The temperature sensing module comprises a temperature probe (7), the temperature probe (7) internally comprises a thermistor (7.2) and a temperature probe lead wire (7.1); the thermistor (7.2) is fixed in a fixed position in the temperature probe by using silica gel filling; the temperature of the oil to be measured is obtained through the thermistor value in the temperature probe.

2. The water cut and temperature sensor for deep-sea hydraulic system according to claim 1, wherein, The sensor shell (5) is connected with the pipeline (3) to be measured, the watertight connector (6) is connected with the sensor shell (5) through threads, and the end face is sealed through a sealing ring, so as to seal the oil to be measured and the external environment; the sensor shell (5) is filled with oil, so as to ensure that the sensor can realize automatic pressure compensation under different sea depths.

3. The water cut and temperature sensor for deep-sea hydraulic systems according to claim 2, wherein When the capacitance value between the inner polar plate (1) and the outer polar plate (2) is collected to calibrate the corresponding water content, the temperature of the oil to be measured is also collected, and the influence of temperature on the water content measurement is eliminated through calculation.

4. The water cut and temperature sensor for deep-sea hydraulic system according to claim 1, wherein, The inner polar plate (1) and the outer polar plate (2) adopt coaxial cylindrical polar plates, a plurality of through-flow holes are arranged on the wall surfaces of the inner polar plate and the outer polar plate, so as to reduce the flow resistance of the oil, realize rapid replacement of the oil between the inner polar plate (1) and the outer polar plate (2), and ensure the accuracy of the detection result.

5. The water cut and temperature sensor for deep-sea hydraulic systems according to claim 1, wherein One end of the inner polar plate (1) and the outer polar plate (2) is connected in the reserved slot of the polar plate support (8), and the other end realizes the same distance of the coaxial polar plate through the terminal support (9), so that the sensor still maintains structural stability when the polar plate is impacted by a large flow in the hydraulic system, thereby ensuring the measurement accuracy.

6. The water cut and temperature sensor for deep-sea hydraulic systems of claim 1, wherein, The temperature probe (7) is installed on the polar plate support (8) through thread connection.

7. The water cut and temperature sensor for deep-sea hydraulic systems of claim 1, wherein, The inner polar plate (1) and the outer polar plate (2) are made of red copper with good conductivity.

8. The water cut and temperature sensor for deep-sea hydraulic systems of claim 1, wherein, The polar plate support (8) and the terminal support (9) are made of insulating materials.

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