An oil-water detector and its detection method

Abstract

This invention relates to the field of oil-water detection technology, and discloses an oil-water detector and its detection method. The oil-water detector includes: a detection instrument panel, a detection module fixedly installed on the part of the detection instrument panel that extends into the oil-water, the detection module including a coaxially nested detection outer tube and a detection probe; an external air supply module is integrated on the detection instrument panel, and the external air supply module is connected to the pneumatic input end of a guide lifting module; the detection probe is coaxially inserted into the inner cavity of the detection outer tube, forming an annular gap between the two, and a scraping residual oil mechanism is installed in the annular gap; this invention uses a scraping wire ring made of elastic memory alloy material, and uses the external air supply module to drive the scraping wire ring to perform reciprocating lifting motion, generating a shear flow field, which can periodically and actively scrape off the residual oil-water mixture adsorbed on the outer wall of the detection probe, so that the outer wall of the detection probe is exposed to a new detection surface in real time, ensuring that the detection probe is in direct contact with the undetected oil and water during each detection.

Description

Technical Field

[0001] This invention relates to the field of oil and water detection, and more specifically, to an oil and water detector and its detection method. Background Technology

[0002] In industrial production processes, the detection of oil-water mixtures is an important monitoring task. For example, in petrochemical, wastewater treatment, and machining coolant circulation systems, it is necessary to monitor the proportion, concentration, or state of oil-water mixtures in real time to ensure production safety and product quality.

[0003] Existing oil-water detectors typically include a detection probe that is immersed in an oil-water mixture for detection. However, in actual use, the outer wall of the detection probe gradually absorbs and accumulates a layer of residual oil-water mixture, forming an oil film or water film. This residue hinders direct contact between the detection probe and fresh oil or water, causing the probe to detect a "filtered" or "attenuated" signal, rather than the true state of the current oil-water mixture. Therefore, we propose an oil-water detector and its detection method. Summary of the Invention

[0004] This invention provides an oil-water detector and its detection method, solving the technical problem in related technologies where residues prevent the detection probe from directly contacting fresh oil and water, causing the detection probe to detect a "filtered" or "attenuated" signal rather than the true state of the current oil-water mixture.

[0005] The first aspect of the present invention provides an oil-water detector, comprising: a detection instrument panel, wherein a detection module is fixedly disposed on the portion of the detection instrument panel that extends into the oil or water, and the detection module includes a coaxially nested detection outer tube and a detection probe;

[0006] An external air supply module is integrated on the instrument panel, and the external air supply module is connected to the pneumatic input terminal of the guide lifting module;

[0007] The detection probe is coaxially inserted into the inner cavity of the detection outer tube, forming an annular gap between them. A scraping mechanism for residual oil is installed inside the annular gap.

[0008] The residual oil scraping mechanism includes two scraping screw rings and a guide lifting module. The two scraping screw rings are made of elastic memory alloy. The two scraping screw rings are spaced apart along the axial direction of the detection probe and tightly fitted onto the outer wall of the detection probe.

[0009] The guide lifting module is flexibly connected to the scraper wire ring;

[0010] The external air supply module, under system control, periodically supplies compressed gas to the guide lifting module, driving the two scraper rings to reciprocate and lift.

[0011] When the scraper ring is displaced, it generates a shear flow field, scraping away the residual oil-water mixture adsorbed on the outer wall of the detection probe. This exposes a new detection surface on the outer wall of the detection probe in real time, ensuring that the detection probe is in direct contact with the undetected oil and water during each detection, thereby achieving real-time updates of detection data and improving detection accuracy.

[0012] Furthermore, the gap between the outer wall of the detection probe and the inner wall of the detection tube is 5mm. The detection probe and the detection tube are concentric. The outer wall of the detection tube has four liquid inlets for oil and water to enter and exit, and to contact the detection probe.

[0013] Furthermore, the guide lifting module includes four guide inner columns, which are symmetrical in pairs. The symmetrical guide inner columns form a group, and all four guide inner columns are fixed to the inner wall of the detection outer tube.

[0014] Furthermore, the inner guide column is equipped with a telescopic rubber column, and multiple elastic ropes are fixedly embedded in the inner wall of the telescopic rubber column to apply a contraction force to the telescopic rubber column at all times. A slider is fixedly installed at the bottom of the telescopic rubber column.

[0015] Furthermore, the slider and the guide inner column form a sliding connection. Two symmetrical wire drawing rings are fixedly installed on the two scraper wire rings respectively. The same set of wire drawing rings matches the same set of guide inner columns, and the wire drawing rings of the two scraper wire rings correspond to different sets of guide inner columns.

[0016] Furthermore, a pull ring line is fixedly installed on one side of the wire drawing ring. The end of the pull ring line away from the wire drawing ring is fixedly connected to the slider. The lifting and lowering of the two sliders in the same group drives the corresponding wire drawing ring to lift and lower.

[0017] Furthermore, a lifting groove is provided on the side of the guide inner column near the center. Toothed blocks are arranged on both sides of the inner wall of the lifting groove. When the pull ring line is raised and lowered, it slides over the toothed blocks on both sides in sequence, causing the pull ring line to vibrate, thereby driving the scraper ring to vibrate when scraping oil and water.

[0018] Furthermore, the top of the four guide inner columns is provided with a first air supply ring and a second air supply ring, which supply air to different groups of telescopic rubber columns. The first air supply ring and the second air supply ring are respectively connected to the external air supply module through two air supply pipes. The external air supply module is equipped with three miniature air supply pumps.

[0019] Furthermore, each of the four guide columns on the inner wall of the outer tube is fixedly equipped with an oil squeezing bladder. The oil squeezing bladder is connected to the third micro air pump in the external air supply module through the third air supply pipe. After the scraping ring has finished scraping, the oil squeezing bladder is expanded to squeeze out the oil and water in the outer tube and allow new oil and water to re-enter.

[0020] The first aspect of this invention provides a detection method for an oil-water detector, comprising the following steps:

[0021] S1. Initial measurement: When the oil-water mixture enters the annular gap between the outer detection tube and the detection probe, the detection instrument panel collects the initial capacitance value.

[0022] S2, Cleaning Trigger: The external air supply module is activated, periodically charging and discharging air into the guide lifting module, driving the two scraping wire rings to reciprocate up and down along the detection probe column, scraping and removing the residue attached to its surface.

[0023] S3. Waste Discharge Action: After scraping is completed, the external air supply module controls the expansion of the oil squeezing bladder to squeeze out the old oil-water mixture containing residue from the detection tube.

[0024] S4. New sample introduction: The oil bladder contracts, and the new oil-water mixture flows back into the annular gap;

[0025] S5. Data Update: The instrument panel performs a second test when the clean test probe comes into contact with fresh oil and water, achieving real-time data updates.

[0026] The beneficial effects of this invention are as follows:

[0027] This invention uses a scraping wire ring made of elastic memory alloy and an external air supply module to drive the scraping wire ring to reciprocate up and down, generating a shear flow field. This can periodically and actively scrape away the residual oil and water mixture adsorbed on the outer wall of the detection probe, so that the outer wall of the detection probe is exposed to a new detection surface in real time. This ensures that the detection probe is in direct contact with the undetected oil and water during each detection, fundamentally solving the problem of detection data lag.

[0028] Because the surface of the detection probe remains clean and free from interference from residual oil-water mixtures, the probe can accurately detect the true physicochemical parameters of the oil-water mixture, significantly improving detection accuracy. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the residual oil scraping mechanism of the present invention;

[0031] Figure 3 This is the invention Figure 2 Enlarged view of point A in the middle;

[0032] Figure 4 This is a schematic diagram of the scraper wire ring structure of the present invention;

[0033] Figure 5 This is a schematic diagram of the telescopic rubber column structure of the present invention;

[0034] Figure 6 This is a schematic diagram of the detection outer tube structure from below in this invention;

[0035] Figure 7 This is a schematic diagram of the bulging state of the oil squeezing bladder of the present invention.

[0036] In the diagram: 11. Detection instrument panel; 12. Detection outer pipe; 13. Liquid inlet; 14. Detection probe; 2. Residual oil scraping mechanism; 21. Scraping thread ring; 22. Threading ring; 23. Pulling ring line; 24. Guide inner column; 25. Lifting groove; 26. Toothed block; 27. First air supply ring; 28. Second air supply ring; 29. ​​Telescopic rubber column; 201. Slider; 202. Retractable elastic rope; 203. Oil squeezing bladder; 31. External air supply module; 32. Air supply pipe. Detailed Implementation

[0037] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0038] Example 1

[0039] like Figures 1-7 As shown, an oil-water detector includes: a detection instrument panel 11, and a detection module is fixedly installed on the part of the detection instrument panel 11 that extends into the oil and water. The detection module includes a coaxially nested detection outer tube 12 and a detection probe 14.

[0040] An external air supply module 31 is integrated on the instrument panel 11, and the external air supply module 31 is connected to the pneumatic input end of the guide lifting module.

[0041] The detection probe 14 is coaxially inserted into the inner cavity of the detection outer tube 12, forming an annular gap between them. A scraping mechanism 2 for scraping residual oil is installed inside the annular gap.

[0042] The residual oil scraping mechanism 2 includes two scraping wire rings 21 and a guide lifting module. The two scraping wire rings 21 are made of elastic memory alloy. The two scraping wire rings 21 are spaced apart along the axial direction of the detection probe 14 and tightly fitted on the outer wall of the detection probe 14.

[0043] The guide lifting module is flexibly connected to the scraper wire ring 21;

[0044] The external air supply module 31 is controlled by the system to periodically supply compressed gas to the guide lifting module, which drives the two scraper rings 21 to perform reciprocating lifting motion;

[0045] When the scraper ring 21 is displaced, it generates a shear flow field, scraping away the residual oil-water mixture adsorbed on the outer wall of the detection probe 14, so that the outer wall of the detection probe 14 is exposed to a new detection surface in real time, ensuring that the detection probe 14 is in direct contact with the undetected oil and water during each detection, thereby realizing real-time updating of detection data and improving detection accuracy.

[0046] The gap between the outer wall of the detection probe 14 and the inner wall of the detection tube 12 is 5mm. The detection probe 14 and the detection tube 12 are concentric. The outer wall of the detection tube 12 has four liquid inlets 13 for oil and water to enter and exit, and they are in contact with the detection probe 14.

[0047] The guide lifting module includes four guide inner columns 24, which are symmetrical in pairs. The symmetrical guide inner columns 24 form a group, and all four guide inner columns 24 are fixed to the inner wall of the detection outer tube 12.

[0048] The inner guide column 24 is equipped with a telescopic rubber column 29. Multiple elastic ropes 202 are fixedly embedded in the inner wall of the telescopic rubber column 29, which always apply a contraction force to the telescopic rubber column 29. A slider 201 is fixedly installed at the bottom of the telescopic rubber column 29.

[0049] The slider 201 and the guide inner post 24 are connected in a sliding manner. Two symmetrical wire drawing rings 22 are fixedly installed on the two scraper wire rings 21 respectively. The same set of wire drawing rings 22 matches the same set of guide inner posts 24, and the wire drawing rings 22 of the two scraper wire rings 21 correspond to different sets of guide inner posts 24 respectively.

[0050] A pull ring line 23 is fixedly installed on one side of the pull ring 22. The end of the pull ring line 23 away from the scraper ring 21 is fixedly connected to the slider 201. The lifting and lowering of the two sliders 201 in the same group drives the corresponding scraper ring 21 to lift and lower.

[0051] A lifting groove 25 is provided on the side of the guide inner column 24 near the center. Toothed blocks 26 are arranged on both sides of the inner wall of the lifting groove 25. When the pull ring 23 is raised and lowered, it slides over the toothed blocks 26 on both sides in sequence, causing the pull ring 23 to vibrate, thereby driving the scraper ring 21 to vibrate when scraping oil and water.

[0052] The top of the four guide inner columns 24 is provided with a first air supply ring 27 and a second air supply ring 28, which supply air to different groups of telescopic rubber columns 29 respectively. The first air supply ring 27 and the second air supply ring 28 are respectively connected to the external air supply module 31 through two air supply pipes 32. The external air supply module 31 is equipped with three micro air supply pumps.

[0053] Oil squeezing bladders 203 are fixedly installed on both sides of the four guide columns 24 on the inner wall of the outer tube 12. The oil squeezing bladders 203 are connected to the third micro air supply pump in the external air supply module 31 through the third air supply pipe 32. After the scraping of the wire ring 21 is completed, the oil squeezing bladders 203 are expanded to squeeze out the oil and water in the outer tube 12 and allow new oil and water to re-enter.

[0054] Its core innovation lies in the use of a pneumatically driven oil scraping mechanism 2 to remove oil stains from the surface of the detection probe 14 in real time, ensuring that each measurement is performed on a clean detection surface, thereby significantly improving the dynamic response speed and data accuracy of the detection.

[0055] Detection principle: Capacitance measurement based on dielectric constant:

[0056] The detection module is based on the principle of a coaxial cylindrical capacitor. The detection probe 14 and the detection outer tube 12 constitute the two plates of the capacitor. When an oil-water mixture enters the annular gap between the two through the inlet 13, the mixture acts as the capacitor dielectric, causing a change in capacitance.

[0057] According to the formula for calculating the capacitance of a cylindrical capacitor:

[0058] ;

[0059] in:

[0060] The vacuum permittivity is 8.854 × 10⁻¹² F / m.

[0061] The relative permittivity of the mixed medium between the two plates;

[0062] To detect the effective length of probe 14;

[0063] To detect the outer diameter of probe 14;

[0064] To check the inner diameter of the outer tube 12.

[0065] Because the relative permittivity of water (approximately 80) is much greater than that of oil and its impurities (typically between 2 and 10), the equivalent permittivity of the mixed medium changes with variations in water content. Significant changes will occur, causing a corresponding change in the capacitance value C. The circuit inside the detection panel 11 detects the change in capacitance and, combined with the built-in algorithm model, can deduce the current oil-water ratio.

[0066] Dynamic cleaning mechanism: A solution to prevent the "wall-hanging" effect. During long-term testing, impurities such as wax, gum, asphalt, and gravel in crude oil easily adhere to the surface of the detection probe 14, forming a high-resistivity dirt film. This film can cause distortion of the detection signal, i.e., produce the "wall-hanging" effect, making the sensor response sluggish.

[0067] To address this issue, a pneumatic reciprocating scraping mechanism 2 for removing residual oil was designed. This mechanism is driven by an external air supply module 31. The external air supply module 31 contains three miniature air pumps, which are periodically filled with compressed gas under system control. The compressed gas is transmitted through the air supply pipe 32 to the first air supply ring 27 and the second air supply ring 28, thereby controlling the movement of the guide lifting module.

[0068] The core operational logic of the guide lifting module is as follows:

[0069] Downward stroke: When a set of air supply rings (such as the first air supply ring 27) is ventilated, compressed gas enters the top of the corresponding guide inner column 24, pushing the internal telescopic rubber column 29 to extend. Since the telescopic rubber column 29 has a pre-embedded elastic rope 202 (always applying a pre-tightening force), under the action of air pressure, the slider 201 overcomes the elastic force and slides downward along the guide inner column 24. The slider 201 pulls the corresponding wire-pulling ring 22 through the pull ring line 23, thereby driving the scraping wire ring 21 to move downward along the detection probe column 14 axis.

[0070] Upward stroke: When the first air supply ring 27 is depressurized, the contraction force of the elastic rope 202 drives the telescopic rubber column 29 and the slider 201 to reset, and pulls up the scraper ring 21 through the pull ring line 23.

[0071] Fluid dynamics-assisted waste disposal:

[0072] As the scraper ring 21 moves, its elastic shape memory alloy material tightly adheres to the probe surface, generating a shear flow field in the annular gap during high-speed movement. This flow field not only mechanically removes the deposits but also uses fluid shear force to disperse the detached oil.

[0073] In addition, after the scraping action is completed, the external air supply module 31 inflates the oil squeezing bladder 203 through the third air supply pipe 32. The oil squeezing bladder 203 expands, quickly squeezing the old oil-water mixture that has been detected in the detection outer pipe 12 out of the liquid inlet 13. After the oil squeezing bladder 203 contracts, the new oil-water mixture re-enters the detection chamber, ensuring the real-time nature of the detected medium each time.

[0074] Process Analysis:

[0075] A. Initialization and Static Measurement Phase: After the system is powered on, the detection circuit inside the detection instrument panel 11 is activated. The oil-water mixture enters the annular gap (5mm gap, ensuring smooth flow and sensitive capacitance signal) between the detection probe 14 and the detection outer tube 12 through the inlet 13. At this time, the scraper ring 21 is in the initial position, such as the top, and the detection circuit collects the current capacitance value as the reference data.

[0076] B. Cleaning Trigger Phase: The system's built-in timer or fluctuations in detection data indicate that cleaning is required. The external air supply module 31 starts, supplying air according to the logical control sequence:

[0077] Scraping action: The system controls the inflation / deflation of the first air supply ring 27 and the second air supply ring 28. The slider 201 is driven to slide up and down through the guide inner column 24, which in turn drives the two scraping wire rings 21 to reciprocate up and down along the detection probe column 14 through the pull ring line 23.

[0078] Micro-vibration assistance: During the sliding process of the pull ring 23, it will slide past the toothed blocks 26 arrayed on both sides of the inner wall of the lifting groove 25 in sequence. The obstruction of the toothed blocks 26 causes the pull ring 23 to generate tiny high-frequency vibrations, which are transmitted to the scraper ring 21, causing it to vibrate when scraping off oil stains, thus enhancing the peeling effect on stubborn deposits.

[0079] Waste discharge action: After scraping is completed, the third air supply is started, the oil squeezing bladder 203 expands, and the sewage containing stripping residual oil is squeezed out of the detection chamber.

[0080] C. Data Update Stage: The oil bladder 203 vents and contracts, allowing new oil-water samples to flow into the detection chamber. At this time, the surface of the detection probe 14 is clean and in direct contact with the fresh medium. The data collected by the detection instrument panel 11 is the current true oil-water ratio, achieving real-time data updates.

[0081] The real-time cleaning by the residual oil scraping mechanism 2 eliminates the measurement dead zone and data lag caused by oil residue on the probe of traditional sensors. Since the detection probe 14 comes into contact with fresh medium each time, the detection value truly reflects the current oil-water ratio, avoiding measurement deviations in dielectric constant caused by residual oil film.

[0082] Employing a closed-loop operating mode of "detection-cleaning-waste discharge-re-detection," the instrument possesses online real-time monitoring capabilities. Combined with periodic pneumatic drive, it enables high-frequency surface renewal and exhibits excellent dynamic response characteristics for conditions with rapidly changing moisture content.

[0083] Example 2

[0084] A detection method for an oil-water detector includes the following steps:

[0085] S1. Initial measurement: When the oil-water mixture enters the annular gap between the detection outer tube 12 and the detection probe 14, the detection instrument panel 11 collects the initial capacitance value.

[0086] S2, Cleaning Trigger: The external air supply module 31 is activated, periodically charging and discharging air into the guide lifting module, driving the two scraping wire rings 21 to reciprocate up and down along the detection probe column 14, scraping and removing the residue attached to its surface.

[0087] S3. Waste discharge action: After scraping is completed, the external air supply module 31 controls the oil squeezing bladder 203 to expand and squeeze out the old oil-water mixture containing residue from the detection outer tube 12.

[0088] S4. New sample introduction: The oil bladder 203 shrinks, and the new oil-water mixture flows back into the annular gap;

[0089] S5. Data Update: The detection instrument panel 11 performs a second test when the clean detection probe 14 comes into contact with fresh oil and water, thereby achieving real-time data updates.

[0090] The embodiments of the present invention have been described above, but the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of the present embodiments, all of which are within the protection scope of the present embodiments.

Claims

1. An oil-water detector, characterized in that, include: The instrument panel (11) is equipped with a detection module in the part of the instrument panel (11) that extends into the oil and water. The detection module includes a coaxially nested detection outer tube (12) and a detection probe (14). An external air supply module (31) is integrated on the detection instrument panel (11), and the external air supply module (31) is connected to the pneumatic input end of the guide lifting module; The detection probe (14) is coaxially inserted into the inner cavity of the detection outer tube (12), forming an annular gap between them. A scraping mechanism (2) for scraping residual oil is provided in the annular gap. The scraping residual oil mechanism (2) includes two scraping wire rings (21) and a guide lifting module. The two scraping wire rings (21) are made of elastic memory alloy. The two scraping wire rings (21) are spaced apart along the axial direction of the detection probe (14) and tightly fitted on the outer wall of the detection probe (14). The guide lifting module is flexibly connected to the scraper wire ring (21); The guide lifting module includes four guide inner columns (24), which are symmetrical to each other in pairs. The symmetrical guide inner columns (24) form a group, and the four guide inner columns (24) are all fixed to the inner wall of the detection outer tube (12). The guide inner column (24) is provided with a telescopic rubber column (29). Multiple elastic ropes (202) are fixedly embedded in the inner wall of the telescopic rubber column (29) to apply a contraction force to the telescopic rubber column (29) at all times. A slider (201) is fixedly provided at the bottom of the telescopic rubber column (29). The slider (201) and the guide inner post (24) are connected in a sliding manner. Two symmetrical wire drawing rings (22) are fixedly provided on the two scraper wire rings (21). The same set of wire drawing rings (22) matches the same set of guide inner posts (24), and the wire drawing rings (22) of the two scraper wire rings (21) correspond to different sets of guide inner posts (24). A pull ring line (23) is fixedly provided on one side of the wire drawing ring (22). The end of the pull ring line (23) away from the scraper wire ring (21) is fixedly connected to the slider (201). The lifting and lowering of the two sliders (201) in the same group drives the corresponding scraper wire ring (21) to lift and lower. The top of the four guide inner columns (24) is provided with a first air supply ring (27) and a second air supply ring (28), which supply air to different groups of telescopic rubber columns (29). The first air supply ring (27) and the second air supply ring (28) are respectively connected to the external air supply module (31) through two air supply pipes (32). The external air supply module (31) is provided with three micro air supply pumps. The external gas supply module (31) is controlled by the system to periodically supply compressed gas to the guide lifting module, which drives the two scraper rings (21) to perform reciprocating lifting motion; When the scraper ring (21) is displaced, it generates a shear flow field to scrape off the residual oil-water mixture adsorbed on the outer wall of the detection probe (14), so that the outer wall of the detection probe (14) is exposed to a new detection surface in real time, ensuring that the detection probe (14) is in direct contact with the undetected oil and water during each detection, thereby realizing real-time updating of detection data and improving detection accuracy.

2. The oil-water detector according to claim 1, characterized in that, The gap between the outer wall of the detection probe (14) and the inner wall of the detection tube (12) is 5mm. The detection probe (14) and the detection tube (12) are concentric. The outer wall of the detection tube (12) has four liquid inlets (13) for oil and water to enter and exit, and to contact the detection probe (14).

3. The oil-water detector according to claim 2, characterized in that, The guide inner column (24) has a lifting groove (25) on one side near the center. The inner walls of the lifting groove (25) are arranged with toothed blocks (26). When the pull ring line (23) is raised and lowered, it slides through the toothed blocks (26) on both sides in sequence, causing the pull ring line (23) to vibrate, thereby driving the scraper ring (21) to vibrate when scraping oil and water.

4. The oil-water detector according to claim 3, characterized in that, Oil squeezing bladders (203) are fixedly installed on both sides of the four guide columns (24) on the inner wall of the outer detection tube (12). The oil squeezing bladders (203) are connected to the third micro air pump in the external air supply module (31) through the third air supply pipe (32). After the scraping of the wire ring (21) is completed, the oil squeezing bladders (203) are expanded to squeeze out the oil and water in the outer detection tube (12) and re-enter new oil and water.

5. A detection method using the oil-water detector as described in claim 4, characterized in that, Includes the following steps: S1. Initial measurement: The oil-water mixture enters the annular gap between the detection outer tube (12) and the detection probe (14), and the detection instrument panel (11) collects the initial capacitance value; S2, Cleaning Trigger: The external air supply module (31) is started, periodically charging and discharging air into the guide lifting module, driving the two scraping wire rings (21) to reciprocate up and down along the detection probe column (14), scraping and removing the residue attached to its surface; S3. Waste discharge action: After the scraping is completed, the external air supply module (31) controls the oil squeezing bladder (203) to expand and squeeze out the old oil-water mixture containing residue from the detection tube (12). S4, New Sample Introduction: The oil bladder (203) contracts, and the new oil-water mixture flows back into the annular gap; S5. Data update: The detection instrument panel (11) performs a second detection when the clean detection probe (14) comes into contact with fresh oil and water, so as to realize the real-time update of data.

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