A sensor for water-in-oil analyzer

Abstract

The present invention discloses a sensor for an oil-water analyzer, wherein a fixed sleeve locks a joint at the upper end of an inner tube locking member, and a mutually insulated shielding tube and a center plate are arranged inside the inner tube locking member, and mutually insulated shielding terminal terminals and center plate terminals are respectively arranged at the upper ends of the two terminals, and the two terminals are respectively connected to a signal receiving terminal in a control unit through wires, and a disc formed from the lower end of the center plate extends out from below the inner tube locking member and is spaced apart from a chassis arranged at the lower end of an outer tube member sleeved outside the inner tube locking member, and in addition to the above structural optimization, a baffle for shielding the upper end of the opening at the location is arranged at the outlet end of the pipeline where the outer tube member is located, thereby allowing a certain amount of measured liquid to accumulate in the pipeline. Through the mutual cooperation of the above structures, the influence of factors such as low oil volume and gas is reduced, high-precision detection is ensured, and the overall structure is easy to disassemble and clean.

Description

Technical Field

[0001] The invention belongs to the technical field of oil-water analysis, and relates to an oil-water analysis structure of crude oil, in particular to a sensor for an oil-water analyzer. Background Art

[0002] The main components of crude oil are oil and water. The dielectric constant of oil is about 2.3, while the dielectric constant of water is 80. The difference between the two is very large, so the physical and electrical properties presented are very different. Based on this, it is very convenient and reliable to measure water content using the radio frequency microwave principle. The measurement sensor is formed between the center rod of the probe and the outer float. As the water content in the measured oil changes, the frequency response (frequency response) also changes accordingly. The electronic unit monitors the change of water content by detecting the frequency response, and calculates the oil water content corresponding to the current frequency response through the internal data processing module, and finally outputs the corresponding 4-20mA current signal through the current loop. Or output in the form of Modbus bus.

[0003] In addition to the radio frequency method, the capacitance method is also a commonly used detection method. When fluids with different water contents flow through the two electrodes of the capacitor, the dielectric constant of the medium between the electrodes will change, causing the capacitance value to change. The detection circuit converts the slight change in capacitance value into a voltage signal, thereby realizing the detection of the water content of crude oil.

[0004] Traditional capacitive water content analyzers have problems with analysis cycle, cost, accuracy, maintenance, etc. The small amount of oil output from the wellhead causes the liquid volume to not bury the probe, which also leads to inaccurate measurement results. Especially in the analysis of oil products with high water content or more impurities, the efficiency and accuracy are more affected. Therefore, the market urgently needs a new oil water content analyzer that can improve analysis efficiency and accuracy. Summary of the invention

[0005] The purpose of the present invention is to solve the defects of the prior art and provide a sensor for an oil-water analyzer. Through the cooperation of various structures, the influence of factors such as low oil volume and gas is reduced, high-precision detection is ensured, and the overall structure is easy to disassemble and clean.

[0006] The present invention provides the following technical solutions:

[0007] A sensor for an oil-water analyzer comprises a sensor and a control unit, wherein the lower end of the sensor is connected to an outer tube component, the outer tube component is used to be installed on a pipeline and the lower end of the sensor can extend into the pipeline; the central plate insulating sleeve in the sensor is arranged inside a shielding tube;

[0008] The control unit comprises an oscillator, a strong drive amplifier, a front amplifier, a bridge capacitor and a data processing module, wherein the output end of the oscillator is respectively connected to the input ends of the strong drive amplifier and the front amplifier, the output end of the strong drive amplifier is connected to the shielding terminal terminal electrically connected to the shielding tube and one end of the bridge capacitor, and the output end of the front amplifier is connected to the center board terminal electrically connected to the center board and the other end of the bridge capacitor; the ground end of the oscillator and the outer tube component are connected to the reference ground of the control unit;

[0009] The data processing module is used to process the input measured capacitance value between the central plate and the outer tube component and output the processed result.

[0010] Further: any one of the two ends of the pipeline is provided with a baffle for shielding the pipeline opening on the same side, or both ends are respectively provided with a baffle for shielding the pipeline opening on the same side.

[0011] Further: the outlet end of the pipeline is provided with a baffle for shielding the opening of the pipeline on the same side, and the height position of the lower end of the baffle is located between the height position of the lower end of the sensor and the height position of the lower end of the outer tube component.

[0012] Further: the baffle is arranged on the inner wall surface of the pipeline near the upper end of the opening.

[0013] Further: the sensor includes a joint, an inner tube locking piece, a shielding tube and a center plate, the upper end of the inner tube locking piece is connected to the joint, the joint is used to connect the meter head, the lower end of the inner tube locking piece is sleeved with a shielding tube insulated from it, the shielding tube is sleeved with a center plate insulated from it, the disk at the lower end of the center plate is located below the lower end of the inner tube locking piece and is spaced apart from the chassis set with the outer tube component; the shielding tube and the center plate are insulated from each other and are electrically connected to the control unit respectively.

[0014] Further: the upper end of the center plate is electrically connected to a center plate terminal insulated from the inner tube locking piece and arranged inside the inner tube locking piece, and the center plate terminal is connected to the control unit through a wire.

[0015] Further: the upper end of the shielding tube is electrically connected to a shielding terminal terminal insulated from the inner tube locking piece and arranged inside the inner tube locking piece, and the shielding terminal terminal is connected to the control unit through a wire.

[0016] Further: a lower opening is provided inside the lower end of the inner tube locking piece, a shielding layer is provided on the inner wall of the opening, the shielding tube is sleeved inside the shielding layer, a shielding layer is provided on the inner wall of the shielding tube, and the center plate is sleeved inside the shielding layer;

[0017] The upper end of the shielding tube extends from the lower opening into the middle opening provided inside the inner tube locking piece above the lower opening, and the shielding tube connecting ring of the lower end of the shielding terminal wiring terminal is sleeved on the outside of the upper end of the shielding tube, and the bottom surface of the shielding tube connecting ring is pressed on the surface of the insulating gasket provided on the upper end surface of the boss beside the lower opening at the bottom of the upper opening, and an insulating sheet is sleeved on the outside of the upper end of the center plate above the shielding tube connecting ring, and the center plate connecting ring of the center plate wiring terminal is sleeved on the outside of the upper end of the center plate on the insulating sheet;

[0018] The wiring board integral with or detachably provided on the shielding tube connection ring is connected to the control unit via a wire; the wiring board integral with or detachably provided on the center plate connection ring is connected to the control unit via a wire.

[0019] Furthermore: a gasket is arranged at the upper end of the inner tube locking piece, the joint is pressed on the gasket, and a fixing sleeve buckled on the outer side of the lower end of the joint is screwed and fixedly connected with the outer side of the upper end of the inner tube locking piece.

[0020] The beneficial effects of the present invention are:

[0021] In the present invention, the fixed sleeve locks the joint at the upper end of the inner tube locking member, and the inner tube locking member is provided with a mutually insulated shielding tube and a center plate, and the upper ends of the two are respectively provided with mutually insulated shielding terminal terminals and center plate terminals, and the two terminals are respectively connected to the signal receiving end in the control unit through wires, and the disc formed at the lower end of the center plate extends from the bottom of the inner tube locking member and is spaced apart from the chassis set at the lower end of the outer tube component set on the outer sleeve of the inner tube locking member, and the bridge capacitor connected to the shielding tube is used as a reference point, and the capacitance value between the center plate disc and the outer tube component chassis is compared with the reference point to obtain the measured capacitance value, and the shielding tube and the disc body at the lower end thereof play a shielding role for the center plate, and an equipotential field is formed at the disc at the lower end of the center disc, which avoids the charge movement after the material is hung, and can obtain a more accurate measured capacitance value. In addition to the above structural optimization, a baffle for shielding the upper end of the opening at the outlet end of the pipeline where the outer tube component is located is provided, thereby allowing a certain amount of measured liquid to accumulate in the pipeline. Through the mutual cooperation of the above structures, the influence of factors such as low oil volume and gas is reduced, high-precision detection is guaranteed, and the overall structure is easy to disassemble and clean. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional view of the present invention.

[0023] Figure 2 for Figure 1 Exploded view of parts.

[0024] Figure 3 for Figure 1 Schematic diagram of the structure when used.

[0025] Figure 4for Figure 1 Overall appearance diagram.

[0026] Figure 5 for Figure 4 Left view of .

[0027] Figure 6 for Figure 4 Enlarged bottom view of .

[0028] Figure 7 This is the schematic diagram of the control unit. DETAILED DESCRIPTION

[0029] 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.

[0030] A water-in-oil analyzer sensor, comprising Figure 1 The sensor and control unit 35 shown in the figure, as shown in the figure, the lower end of the sensor is connected to the outer tube component 25, the outer tube component is used to be installed on the pipeline 32 and the lower end of the sensor can extend into the pipeline; the center plate 16 in the sensor is set inside the shielding tube 15, and the outer tube component is connected to the reference ground of the control unit. The reference ground is a circuit node set in the control unit, which provides a common reference potential and a reference point for measurement. The chassis 18 at the lower end of the external pipe in the figure is welded and installed on the pipeline, and the pipeline 32 is connected to the reference ground and makes the external pipe and the pipeline have the same potential (the external pipe and the pipeline are both connected to the reference ground).

[0031] Either end of the pipeline is provided with a baffle 31 for shielding the pipeline opening 34 on the same side, or both ends are provided with baffles for shielding the pipeline opening on the same side. The preferred solution is: the outlet end of the pipeline is provided with a baffle for shielding the pipeline opening on the same side, and the height position of the lower end of the baffle is located between the height position of the lower end of the sensor and the height position of the lower end of the outer tube component. Figure 3As shown, the cross section of the baffle is a triangle shape, and the long slope of the triangle faces the inlet end of the pipeline (right side in the figure). When the measured liquid flows to this place, it is blocked by the long slope and the flow rate is reduced. Moreover, since the vertical height of the lowest point of the long slope (the vertical height position of the lower end of the baffle) is lower than the vertical height of the bottom surface of the disk 20 at the lower end of the center plate 16 in the sensor and the opening 34 is blocked, the amount and speed of the measured liquid flowing out from the outlet are reduced, thereby achieving the liquid level of the measured liquid in the pipeline to maintain a certain height, ensuring the detection accuracy of the sensor. In addition, since the baffle is located at the upper position of the outlet end and is in an inclined shape, the water in the oil will not accumulate in the pipeline, but will flow away with the oil, which will not affect the water content in the oil during subsequent collection, thereby ensuring the timeliness and accuracy of each sampling data, and the inclined shape also avoids the problem of liquid accumulation and forming dead liquid and affecting the measurement. Furthermore, due to the presence of the baffle, the disc of the center plate and the bottom plate of the outer tube component are immersed in the oil, and the gas or eddy current on the upper part of the pipeline will not affect the stability and accuracy of the measurement.

[0032] A through hole 33 is made on the pipeline, and the outer tube component is welded and fixed in the through hole, and the sensor is installed in the outer tube component. The lower end of the cylindrical structure 25 at the upper end of the outer tube component is welded to the surface of the through hole, and the connecting columns 19 symmetrically arranged on the cylindrical structure extend into the pipeline. The lower end of the cylindrical structure between the two connecting columns is formed with an arc-shaped side plate 29 protruding downward, and the lower ends of the two connecting columns are connected to a chassis 18. A flange 30 is welded at each end of the pipeline, and the flange is used to connect other flanges so that the pipeline is connected in series in the conveying pipeline of the measured liquid.

[0033] The sensor includes a joint 2, an inner tube locking piece 9, a shielding tube 15 and a center plate 16. The upper end of the inner tube locking piece is connected to a joint with a hole 1, and the joint is used to connect a meter head. The lower end of the inner tube locking piece is sleeved with a shielding tube insulated from it, and the shielding tube is sleeved with a center plate insulated from it. The disk 20 at the lower end of the center plate is located below the lower end of the inner tube locking piece and is spaced apart from the chassis 18 set on the outer tube component; the shielding tube and the center plate are insulated from each other and are electrically connected to the control unit respectively.

[0034] The upper end of the center plate is electrically connected to the center plate terminal 8 insulated from the inner tube locking member and disposed inside the inner tube locking member, and the center plate terminal is connected to the control unit through a wire. The upper end of the shielding tube is electrically connected to the shielding terminal terminal 11 insulated from the inner tube locking member and disposed inside the inner tube locking member, and the shielding terminal terminal is connected to the control unit through a wire.

[0035] The specific installation structure of the shielding tube and the center plate is as follows: a lower opening 26 is provided inside the lower end of the inner tube locking member, a shielding layer 14 is provided on the inner wall of the opening, a shielding tube is sleeved inside the shielding layer, a shielding layer 14 is provided on the inner wall of the center hole 24 of the shielding tube, and a center plate is sleeved inside the shielding layer. The upper end of the shielding tube extends from the lower opening into the middle opening 27 provided inside the inner tube locking member above the lower opening, a shielding tube connecting ring at the lower end of the shielding terminal terminal 11 is sleeved outside the upper end of the shielding tube, the bottom surface of the shielding tube connecting ring is pressed against the surface of the insulating gasket 12 provided on the upper end surface of the boss 13 beside the lower opening at the bottom of the upper opening, the outer circumferential surface of the shielding tube connecting ring is spaced from the inner wall of the middle opening, an insulating sheet 10 is sleeved outside the upper end of the center plate above the shielding tube connecting ring, and a center plate connecting ring of the center plate terminal 8 is sleeved outside the upper end 28 of the center plate on the insulating sheet. The shielding tube connection ring is integrally or detachably provided with a terminal block 7 which is connected to the control unit via a wire; the center plate connection ring is integrally or detachably provided with a terminal block 7 which is connected to the control unit via a wire.

[0036] The surface where the inner tube locking piece contacts the outer tube part is provided with an annular groove 21, and the groove is filled with a sealing ring 22. The bottom surface of the lower end of the inner tube locking piece that contacts the upper end surface of the disk body 17 integrally provided with the lower end of the shielding tube is provided with an annular groove 21, and the groove is filled with a sealing ring 22. The bottom surface of the disk body 17 that contacts the upper end surface of the disc 20 is provided with an annular groove 21, and the groove is filled with a sealing ring 22. After the sealing ring 22 provided on the bottom surface of the disc body 17 and the lower end 23 of the inner tube locking piece fills the groove, a small part will protrude below the groove, and the protruding small part will cause a small gap between the bottom surface of the lower end of the inner tube locking piece and the upper end surface of the disc body 17, thereby achieving insulation between the inner tube locking piece and the disc body. Similarly, the sealing ring 22 on the bottom surface of the disc body also insulates the disc body and the disc 20.

[0037] A gasket 4 is arranged on the upper end surface of the upper end portion 6 of the inner tube locking piece, and the bottom surface of the lower end portion of the joint is pressed on the gasket. A fixing sleeve 5 is buckled on the outside of the lower end of the joint, and the annular bent edge 3 at the upper end of the fixing sleeve is pressed on the convex edge arranged in a corresponding position of the joint. An internal thread is arranged on the inner side of the lower end portion of the fixing sleeve, and the internal thread is screwed together with the external thread arranged on the outside of the upper end of the inner tube locking piece to fix the inner tube locking pieces of the joint box to each other.

[0038] The shielding tube and the center plate are insulated and mutually shielded by the shielding layer, and the disc body 17 at the lower end of the shielding tube and the disc 20 at the lower end of the center plate are insulated and mutually shielded by the sealing ring 22 and the small gap. The main function of this mutual shielding is that when the disc has hanging material, the disc body and the disc form an equipotential field, so that the charge in the hanging material will not move, thereby making the measured capacitance value between the disc and the chassis more accurate.

[0039] The control unit is installed inside the housing 36 mounted on the connector 2. Figure 7 As shown, it includes an oscillator, a strong drive amplifier, a front amplifier, a bridge capacitor and a data processing module, the output end of the oscillator is respectively connected to the input ends of the strong drive amplifier and the front amplifier, the output end of the strong drive amplifier is connected to the shielding end terminal electrically connected to the shielding tube and one end of the bridge capacitor, the output end of the front amplifier is connected to the center plate terminal electrically connected to the center plate and the other end of the bridge capacitor; the ground end of the oscillator and the outer tube component are connected to the reference ground of the control unit; the data processing module is used to process the input measured capacitance value between the center plate and the outer tube component and output the processed result.

[0040] The oscillator generates a sine wave and transmits it to the input of the strong drive amplifier and the front amplifier respectively. The two waveforms are then transmitted to the shield terminal and the center board terminal. The bridge capacitor is a single-arm capacitor bridge, which has a small capacitor impedance and a temperature coefficient close to zero, and can provide a more stable and accurate reference point. The strong drive amplifier has the characteristics of strong driving ability and strong load capacity. The front amplifier is an ordinary amplifier.

[0041] Figure 7 The sensor capacitance is actually the capacitance formed between the center plate disc and the outer tube chassis, and its measured value is the above-mentioned measured capacitance value. When the water-containing oil passes through the pipeline, the measured capacitance value changes. The data compared with the reference point is amplified by the first amplifier of the data processing module, and then input into the MCU after passing through the detection circuit, the second amplifier and the mode conversion circuit. The data processed by the MCU outputs a current signal or a 485 digital signal.

[0042] The installation process of the present invention is:

[0043] The baffle 14 is welded to the inner wall of the pipeline outlet end.

[0044] The outer pipe part is inserted into the through hole of the pipeline and welded.

[0045] The sealing ring is respectively inserted into the bottom surface of the inner tube locking piece and the bottom surface of the shielding tube disc body.

[0046] Put two heat shrink tubes on the shielding tube and the outside of the center plate and heat shrink them to form two shielding layers.

[0047] Insert the upper end of the shielding tube into the lower opening of the inner tube locking piece, put the insulating gasket and the shielding tube terminal on the outside of the upper end of the shielding tube, screw the shielding tube connecting ring of the shielding tube terminal onto the upper end of the shielding tube, and fix the shielding tube on the boss of the inner tube locking piece.

[0048] Insert the center plate into the center hole of the shielding tube, put the insulating sheet and the center plate terminal on the outside of the upper end of the center plate, screw the center plate connecting ring of the center plate terminal on the upper end of the center plate, and fix the center plate on the shielding tube connecting ring.

[0049] Put the fixing sleeve onto the outside of the joint, put the gasket in place, and screw the fixing sleeve onto the upper end of the inner tube locking piece.

[0050] Finally, the lower end 23 of the inner tube locking piece in the installed sensor is inserted into the outer tube component and the two are fixed to each other by threaded engagement.

[0051] The various structures of the present invention cooperate with each other to reduce the influence of factors such as low oil volume and gas, and ensure high-precision detection; from the perspective of installation and maintenance, since the joint, shielding tube, center plate and terminal are all installed in the inner tube locking piece, the installation of the sensor is achieved by engaging the inner tube locking piece in the external pipe fitting, and the disassembly of the sensor is completed by unscrewing the inner tube locking piece from the external pipe fitting. The overall structure is easy to disassemble and clean.

Claims

1. A sensor for an oil-water analyzer, comprising a sensor and a control unit, characterized in that: The lower end of the sensor is connected to an outer tube component, the outer tube component is used to be installed on the pipeline and the lower end of the sensor can extend into the pipeline; The sensor comprises a joint, an inner tube locking piece, a shielding tube and a center plate, the upper end of the inner tube locking piece is connected to the joint, the joint is used to connect the meter head, the lower end of the inner tube locking piece is sleeved with a shielding tube insulated therefrom, the shielding tube is sleeved with a center plate insulated therefrom, a disc formed at the lower end of the center plate extends out from below the inner tube locking piece and is spaced apart from a chassis provided at the lower end of the outer tube component sleeved outside the inner tube locking piece; the shielding tube and the center plate are insulated from each other and are electrically connected to the control unit respectively; The control unit comprises an oscillator, a strong drive amplifier, a front amplifier, a bridge capacitor and a data processing module, wherein the output end of the oscillator is respectively connected to the input ends of the strong drive amplifier and the front amplifier, the output end of the strong drive amplifier is connected to the shielding terminal terminal electrically connected to the shielding tube and one end of the bridge capacitor, and the output end of the front amplifier is connected to the center board terminal electrically connected to the center board and the other end of the bridge capacitor; the ground end of the oscillator and the outer tube component are connected to the reference ground of the control unit; The data processing module is used to process the input measured capacitance value between the central plate and the outer tube component and output the processed result.

2. The oil-water analyzer sensor according to claim 1, characterized in that: Any one of the two ends of the pipeline is provided with a baffle for shielding the pipeline opening on the same side, or both ends are respectively provided with a baffle for shielding the pipeline opening on the same side.

3. The oil-water analyzer sensor according to claim 2, characterized in that: The outlet end of the pipeline is provided with a baffle for shielding the opening of the pipeline on the same side, and the height position of the lower end of the baffle is located between the height position of the lower end of the sensor and the height position of the lower end of the outer tube component.

4. The oil-water analyzer sensor according to claim 3, characterized in that: The baffle is arranged on the inner wall surface of the pipeline close to the upper end of the opening.

5. The oil-water analyzer sensor according to claim 4, characterized in that: The upper end of the center plate is electrically connected to a center plate terminal insulated from the inner tube locking piece and arranged inside the inner tube locking piece, and the center plate terminal is connected to the control unit through a wire.

6. The oil-water analyzer sensor according to claim 5, characterized in that: The upper end of the shielding tube is electrically connected to a shielding terminal connection terminal insulated from the inner tube locking piece and arranged inside the inner tube locking piece, and the shielding terminal connection terminal is connected to the control unit through a wire.

7. The oil-water analyzer sensor according to claim 6, characterized in that: A lower opening is provided inside the lower end of the inner tube locking piece, a shielding layer is provided on the inner wall of the opening, the shielding tube is sleeved inside the shielding layer, a shielding layer is provided on the inner wall of the shielding tube, and the center plate is sleeved inside the shielding layer; The upper end of the shielding tube extends from the lower opening into the middle opening provided inside the inner tube locking piece above the lower opening, and the shielding tube connecting ring of the lower end of the shielding terminal wiring terminal is sleeved on the outside of the upper end of the shielding tube, and the bottom surface of the shielding tube connecting ring is pressed on the surface of the insulating gasket provided on the upper end surface of the boss beside the lower opening at the bottom of the upper opening, and an insulating sheet is sleeved on the outside of the upper end of the center plate above the shielding tube connecting ring, and the center plate connecting ring of the center plate wiring terminal is sleeved on the outside of the upper end of the center plate on the insulating sheet; The wiring board integral with or detachably provided on the shielding tube connection ring is connected to the control unit via a wire; the wiring board integral with or detachably provided on the center plate connection ring is connected to the control unit via a wire.

8. The oil-water analyzer sensor according to claim 5, 6 or 7, characterized in that: A gasket is arranged at the upper end of the inner tube locking piece, the joint is pressed on the gasket, and a fixing sleeve buckled on the outer side of the lower end of the joint is screwed and fixedly connected with the outer side of the upper end of the inner tube locking piece.

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