Automatic sample injection detection method for water content in oil and device using method

Abstract

The invention discloses an automatic sample injection detection method for water content in oil and a device using the method, the detection method comprises the following steps: 1, turning on a micro-water detector, and starting calibration after the instrument is electrolytically balanced; 2, operating a calibration sample introduction mechanism to automatically extract the pure water in the water storage cup, and injecting the pure water into the electrolytic cup for calibration; and step 3, after the calibration is qualified, operating the sample oil injection mechanism to obtain the water content in the sample oil to be detected through analysis of the analysis and detection mechanism, the device using the detection method, the micro-water detector and the sample injection device are electrically connected with a central control module, the micro-water detector is placed on one side of the sample injection device, and the sample injection device is placed on the other side of the sample injection device. According to the detection method, the accuracy of a detection result is ensured by adopting a mode of averaging through multiple times of detection, and the device adopts an automatic sampling analysis detection mode and is provided with a water inlet and a sample inlet, so that the calibrated pure water is effectively prevented from being retained in the sample inlet, and the accuracy of the detection result is improved.

Description

Technical Field

[0001] The invention relates to the technical field of water content detection of oil used for power, and in particular to an automatic sampling detection method for water content in oil and a device using the method. Background Art

[0002] In the use of power equipment, many devices use oil, including insulating oil, lubricating oil, and fire-resistant oil. If the insulating oil in operation in the power equipment contains water, the electrical properties of the insulating oil will deteriorate and the insulation level will be reduced; the presence of water in the lubricating oil will accelerate the aging of the oil and produce emulsification, and at the same time it will react with the additives in the oil to promote its decomposition, causing the equipment to rust; water in fire-resistant oil will cause the oil to hydrolyze and deteriorate, the acid value will increase, causing corrosion of system components, and will also affect the lubrication properties of the oil.

[0003] The presence of moisture will affect the quality of insulating oil, lubricating oil and fire-resistant oil, thus seriously affecting the normal operation of equipment. Therefore, it is necessary to effectively detect the moisture content in the relevant oil and monitor the changes in the moisture content in the oil in time.

[0004] At present, the detector used to detect the moisture content in oil in the laboratory requires manual calibration and sampling testing by experimenters, which has problems such as large operating errors and poor repeatability. In addition, the detector purchased by the laboratory has only one sampling port. After injecting the pure water used for calibration, some pure water will remain in the sampling port, and then the sample oil will be injected again. The residual pure water will mix into the sample oil, which will affect the test results of the moisture content in the sample oil to be tested, causing deviations in the test results. Summary of the invention

[0005] In order to overcome the above-mentioned problems, the purpose of the present invention is to provide an automatic sampling detection method for water content in oil and a device using the method. The detection method adopts a method of finding an average of multiple tests in both the calibration stage and the detection stage to address the deviation of the detection results, thereby ensuring the accuracy of the detection results. The device using the detection method adopts an automatic sampling and analysis detection method to effectively solve the problem of large errors in liquid collection and injection operations by personnel. At the same time, a water inlet and a sampling port are set in the micro-water detector to effectively avoid the influence of calibration pure water retained in the sampling port on the detection result of the water content of the oil to be tested, thereby further improving the accuracy of the detection result.

[0006] The technical solution adopted by the present invention is:

[0007] An automatic sampling detection method for water content in oil comprises the following steps:

[0008] Step 1: Turn on the micro-water detector, wait for the instrument to reach electrolytic balance, and then start the instrument calibration;

[0009] The second step is to operate the second rotating base of the trace water detector to make the water inlet of the electrolysis cup close to the sampling device, operate the first rotating base on the sampling device to rotate, so that the calibration sampling mechanism is located on the side close to the trace water detector, and operate the calibration sampling mechanism to automatically extract pure water from the water storage cup and inject the pure water into the electrolyte of the electrolysis cup for calibration;

[0010] The third step, after the calibration is qualified, operate the second rotating base of the micro-water detector to make the sampling port of the electrolysis cup close to the sampling device, operate the first rotating base on the sampling device to rotate, so that the insulating oil sampling mechanism or the lubricating oil sampling mechanism or the fire-resistant oil sampling mechanism is located on the side close to the micro-water detector, operate the insulating oil sampling mechanism or the lubricating oil sampling mechanism or the fire-resistant oil sampling mechanism to automatically extract the sample oil in the insulating oil cup or the lubricating oil cup or the fire-resistant oil cup and inject the oil into the electrolyte of the electrolysis cup, and obtain the moisture content in the sample oil to be tested through the analysis and detection mechanism of the micro-water detector.

[0011] As a further description of the present invention, in the second step, the specific steps of calibration are:

[0012] The calibration injection needle of the calibration injection mechanism draws 0.5 microliters of pure water and calibrates three times in succession. The results of the three times are all between 475-525 mg / L, indicating that the calibration is qualified.

[0013] As a further description of the present invention, in the third step, the injection needles of the insulating oil injection mechanism, the lubricating oil injection mechanism, and the fire-resistant oil injection mechanism are all 1 ml injection needles, and the steps of injecting the sample oil into the electrolyte of the electrolytic cup are:

[0014] S01: Rinse the barrel of the injection needle with the oil sample to be tested for no less than three times before injecting the electrolyte;

[0015] S02: Take 1 ml of the oil sample to be tested and inject it into the electrolyte through the injection port. Inject the sample at least twice and take the average of the two results. The two parallel results must meet the following conditions:

[0016] When the water content is below 10 mg / L, the allowable difference is 2 mg / L;

[0017] When the water content is between 10-20 mg / L, the allowable difference is 3 mg / L;

[0018] When the water content is between 21-40 mg / L, the allowable difference is 4 mg / L;

[0019] When the water content is greater than 41 mg / L, the allowable difference is 10%.

[0020] A device using an automatic sampling detection method for water content in oil comprises a micro-water detector, a sampling device, and a central control module. The micro-water detector and the sampling device are electrically connected to the central control module respectively, and the micro-water detector is placed on one side of the sampling device;

[0021] The sampling device comprises a first fixed base, a first rotating base, a first motor, a column, a first cross arm, a second cross arm, and an automatic sampling mechanism. The first motor is fixedly installed in the middle position of the first fixed base, and its output shaft is perpendicular to the upper surface of the first fixed base. The bottom end of the first rotating base is connected to the output shaft of the first motor and is located on the upper surface of the first fixed base. The middle position of the upper surface of the first rotating base is fixedly connected to the column. The installation angle between the first cross arm and the second cross arm is 90°. The first cross arm and the second cross arm have the same structure. The middle part is fixedly installed at the upper end of the column, and mounting holes are provided at both ends. The automatic sampling mechanism has four groups, namely, a calibration sampling mechanism, an insulating oil sampling mechanism, a lubricating oil sampling mechanism, and an anti-fire oil sampling mechanism. The four groups of automatic sampling mechanisms have the same structure and are respectively installed in the mounting holes at both ends of the first cross arm and the second cross arm.

[0022] The micro-water detector includes an electrolysis cup, a rotating mechanism, and an analysis and detection mechanism. The rotating mechanism includes a second fixed base, a second rotating base, and a second motor. The second motor is fixedly installed in the middle position of the second fixed base, and its output shaft is perpendicular to the upper surface of the second fixed base. The bottom end of the second rotating base is connected to the output shaft of the second motor and is located on the upper surface of the second fixed base. An electrolysis cup placement groove is provided on the upper surface of the second rotating base, and the electrolysis cup is placed in the electrolysis cup placement groove. The analysis and detection mechanism is connected to the electrolysis cup, and a water inlet and a sample inlet are respectively provided on the left and right sides above the electrolysis cup.

[0023] As a further description of the present invention, the automatic sampling mechanism includes a fixed bracket, an injection motor, a first electric track, a second electric track, a third electric track, an injection needle, a first fixed clamp, a first fixed cross bar, a second fixed clamp, a second fixed cross bar, and a third fixed cross bar. The injection motor is fixedly installed in the mounting hole, and the output end of the injection motor is fixedly connected to the upper middle position of the fixed bracket. The front of the fixed bracket is provided with the first electric track, the second electric track, and the third electric track. The first fixed clamp is installed above the injection needle, one end of the first fixed cross bar is connected to the first fixed clamp, and the other end is connected to the first electric track. The second fixed clamp is installed in the middle position of the injection needle, one end of the second fixed cross bar is connected to the second fixed clamp, and the other end is connected to the second electric track. One end of the third fixed cross bar is connected to the lower end position of the injection needle, and the other end is connected to the third electric track.

[0024] As a further description of the present invention, the injection needle includes an inner core, an inner core handle, a barrel, a needle, and a sleeve. The inner core handle is arranged at the top end of the inner core, a first fixing clip is installed on the inner core handle, the inner core is slidably connected in the barrel, a second fixing clip is installed on the side of the lower end of the barrel, the needle is connected to the lower surface of the barrel, the sleeve is located on the outer side of the lower end of the needle, and the sleeve is connected to one end of a third fixed cross bar.

[0025] As a further description of the present invention, five sample placement slots are provided on the first rotating base, which respectively place a water storage cup, an insulating oil cup, a fire-resistant oil cup, and a lubricating oil cup. The water storage cup, the insulating oil cup, the fire-resistant oil cup, and the lubricating oil cup have the same structure, and are all provided with cup covers on top. A sampling hole is provided in the middle of the cup cover, and a silicone pad is provided above the sampling hole.

[0026] As a further description of the present invention, the first electric track, the second electric track and the third electric track have the same structure and all adopt a synchronous belt module.

[0027] As a further description of the present invention, the central control module adopts a PLC programmable logic controller, which connects the first motor, the second motor, four groups of injection motors of automatic injection mechanisms, the first electric track, the second electric track, and the third electric track.

[0028] Beneficial effects of the present invention:

[0029] The invention discloses an automatic sampling detection method for the moisture content in oil. The detection method needs to be calibrated three times continuously in the calibration stage for the deviation of the detection result. The three results are all between 475-525 mg / L, which is qualified for the calibration. In the detection stage, 1 ml of the oil sample to be tested is extracted and injected into an electrolyte through an injection port. The sample is injected at least twice, and the average value of the two results is taken. The two detection results must meet conditions. In both the calibration stage and the detection stage, a method of averaging multiple tests is adopted to ensure the accuracy of the detection result.

[0030] The present invention uses a device for automatic sampling detection method of water content in oil, including a trace water detector, a sampling device, and a central control module. The trace water detector and the sampling device are electrically connected to the central control module respectively. The trace water detector is placed on one side of the sampling device. The device adopts an automatic sampling analysis detection method to effectively solve the problem of large errors in liquid collection and injection operations by personnel. A water inlet and a sampling port are respectively arranged on the left and right sides above the electrolysis cup of the trace water detector, which effectively avoids the influence of calibrated pure water on the detection result of the water content of the oil to be tested due to the retention of calibrated pure water in the sampling port, thereby further improving the accuracy of the detection result. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1This is a flow chart of an automatic sampling detection method for water content in oil proposed by the present invention;

[0032] Figure 2 This is a schematic diagram of the overall structure of the device for the automatic sampling detection method of the moisture content in oil proposed by the present invention;

[0033] Figure 3 This is a schematic diagram of the electrolytic cup and rotating mechanism structure of a micro-water detector of the device using the automatic sampling detection method of the water content in oil proposed by the present invention;

[0034] Figure 4 This is a schematic structural diagram of a first rotating base of a sampling device of a device for automatically sampling and detecting the moisture content in oil proposed by the present invention;

[0035] Figure 5 This is a schematic diagram of the structure of the automatic sampling mechanism of the device using the automatic sampling detection method of the water content in oil proposed by the present invention;

[0036] Figure 6 This is a schematic diagram of the structure of the sampling needle of the device using the automatic sampling detection method of the water content in oil proposed by the present invention;

[0037] Figure 7 The present invention provides a control flow chart of a central control module of a device for automatically sampling and detecting the moisture content in oil.

[0038] Description of Reference Numerals

[0039] 1- Micro-water detector,

[0040] 11-electrolysis cup, 111-water inlet, 112-sample inlet,

[0041] 12-rotating mechanism, 121-second fixed base, 122-second rotating base,

[0042] 13-Analysis and testing institutions,

[0043] 2- Injection device,

[0044] 21- first fixed base,

[0045] 22-first rotating base, 221-sample placement slot, 222-water storage cup, 223-insulating oil cup, 224-fire-resistant oil cup, 225-lubricating oil cup, 226-waste liquid cup, 227-cup cover, 228-silicone pad,

[0046] 23- Column,

[0047] 24-First cross arm,

[0048] 25- Second cross arm,

[0049] 26-automatic sampling mechanism, 261-fixed bracket, 262-sampling motor, 263-first electric track, 264-second electric track, 265-third electric track,

[0050] 266-injection needle, 2661-inner core, 2662-inner core handle, 2663-barrel, 2664-needle, 2665-casing,

[0051] 267-First fixing clip,

[0052] 268- first fixed crossbar,

[0053] 269-Second fixing clip,

[0054] 2610-Second fixed crossbar,

[0055] 2611-third fixed crossbar,

[0056] 3- Central control module. DETAILED DESCRIPTION

[0057] The specific implementation of the present invention is described below in conjunction with the accompanying drawings and embodiments:

[0058] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0059] At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0060] like Figures 1 to 7 As shown, it shows a specific embodiment of the present invention:

[0061] Embodiment 1

[0062] An automatic sampling detection method for water content in oil comprises the following steps:

[0063] Step 1: Turn on the micro-water detector 1, wait for the instrument to reach electrolytic balance, and then start the calibration of the instrument;

[0064] The second step is to operate the second rotating base 122 of the trace water detector 1 to make the water inlet 111 of the electrolysis cup 11 close to the sampling device 2, and operate the first rotating base 22 on the sampling device 2 to rotate so that the calibration sampling mechanism is located on the side close to the trace water detector 1, and operate the calibration sampling mechanism to automatically extract pure water from the water storage cup 222 and inject the pure water into the electrolyte of the electrolysis cup 11 for calibration;

[0065] The third step, after the calibration is qualified, operate the second rotating base 122 of the micro-water detector 1 to make the sampling port 112 of the electrolysis cup 11 close to the sampling device 2, operate the first rotating base 22 on the sampling device 2 to rotate, so that the insulating oil sampling mechanism or the lubricating oil sampling mechanism or the fire-resistant oil sampling mechanism is located on the side close to the micro-water detector 1, operate the insulating oil sampling mechanism or the lubricating oil sampling mechanism or the fire-resistant oil sampling mechanism to automatically extract the sample oil in the insulating oil cup 223 or the lubricating oil cup 225 or the fire-resistant oil cup 224 and inject the oil into the electrolyte of the electrolysis cup 11, and analyze the moisture content in the sample oil to be tested through the analysis and detection mechanism 13 of the micro-water detector 1.

[0066] Specifically, in the second step, the specific steps of calibration are:

[0067] The calibration injection needle 266 of the calibration injection mechanism draws 0.5 microliters of pure water and calibrates three times in succession. The results of the three times are all between 475-525 mg / L, indicating that the calibration is qualified.

[0068] Specifically, in the third step, the injection needles 266 of the insulating oil injection mechanism, the lubricating oil injection mechanism, and the fire-resistant oil injection mechanism are all 1 ml injection needles, and the steps of injecting the sample oil into the electrolyte of the electrolysis cup are:

[0069] S01: flush the barrel 2663 of the injection needle 266 with the oil sample to be tested for no less than three times before injecting the electrolyte;

[0070] S02: Draw 1 ml of the oil sample to be tested and inject it into the electrolyte through the injection port 112. Inject the sample at least twice and take the average of the two results. The two parallel results must meet the following conditions:

[0071] When the water content is below 10 mg / L, the allowable difference is 2 mg / L;

[0072] When the water content is between 10-20 mg / L, the allowable difference is 3 mg / L;

[0073] When the water content is between 21-40 mg / L, the allowable difference is 4 mg / L;

[0074] When the water content is greater than 41 mg / L, the allowable difference is 10%.

[0075] In this embodiment, if Figure 1 As shown, the detection method needs to be calibrated three times in a row during the calibration stage for the deviation of the detection result. The results of the three times are all between 475-525 mg / L, which means the calibration is qualified. During the detection stage, 1 ml of the oil sample to be tested is drawn and injected into the electrolyte through the injection port 112. The sample is injected at least twice, and the average of the two results is taken; the two test results must meet the conditions. The method of averaging multiple tests is adopted in both the calibration stage and the detection stage to ensure the accuracy of the test results.

[0076] Embodiment 2

[0077] The device using the automatic sampling detection method for the moisture content in oil comprises a micro-water detector 1, a sampling device 2, and a central control module 3. The micro-water detector 1 and the sampling device 2 are electrically connected to the central control module 3 respectively, and the micro-water detector 1 is placed on one side of the sampling device 2.

[0078] In this embodiment, Figure 2 As shown, the micro-water detector 1 is used for analyzing and detecting the water content of sample oil for power oil, the sampling device 2 is used for injecting sample oil for power oil, and the central control module 3 is used to control the sampling device 2 and the micro-water detector 1 to realize automatic sampling, analysis and detection, effectively solve the problem of large errors in liquid collection and injection operations by personnel, improve the accuracy of the detection results, and thus ensure the safe and reliable operation of the power grid.

[0079] The sampling device 2 includes a first fixed base 21, a first rotating base 22, a first motor, a column 23, a first cross arm 24, a second cross arm 25, and an automatic sampling mechanism 26. The first motor is fixedly installed in the middle position of the first fixed base 21, and its output shaft is perpendicular to the upper surface of the first fixed base 21. The bottom end of the first rotating base 22 is connected to the output shaft of the first motor and is located on the upper surface of the first fixed base 21. The middle position of the upper surface of the first rotating base 22 is fixedly connected to the column 23. The installation angle between the first cross arm 24 and the second cross arm 25 is 90°. The first cross arm 24 and the second cross arm 25 have the same structure. The middle part is fixedly installed at the upper end of the column 23, and mounting holes are opened at both ends. The automatic sampling mechanism 26 has four groups, which are a calibration sampling mechanism, an insulating oil sampling mechanism, a lubricating oil sampling mechanism, and a fire-resistant oil sampling mechanism. The four groups of automatic sampling mechanisms 26 have the same structure and are respectively installed in the mounting holes at both ends of the first cross arm 24 and the second cross arm 25.

[0080] In this embodiment, Figure 2As shown, the sampling device 2 is used for injecting sample oil of electric power oil, and the first fixed base 21 provides supporting force. When the first motor is in working state, the first rotating base 22 connected to the first fixed base 21 through the first motor will rotate, so that the column 23 fixedly mounted on the first rotating base 22 rotates, and the first cross arm 24 and the second cross arm 25 above the column 23 rotate. At this time, the automatic sampling mechanism 26 fixedly mounted at both ends of the first cross arm 24 and the second cross arm 25 rotates, and according to the detection steps, the corresponding calibration sampling mechanism or insulating oil sampling mechanism or lubricating oil sampling mechanism or fire-resistant oil sampling mechanism is rotated to a position close to one side of the micro-water detector 1.

[0081] Specifically, five sample placement slots 221 are provided on the first rotating base 22, which respectively place a water storage cup 222, an insulating oil cup 223, an anti-fire oil cup 224, and a lubricating oil cup 225. The water storage cup 222, the insulating oil cup 223, the anti-fire oil cup 224, and the lubricating oil cup 225 have the same structure, and a cup cover 227 is provided on the top of each of them. A sampling hole is provided in the middle of the cup cover 227, and a silicone pad 228 is provided above the sampling hole.

[0082] In this embodiment, if Figure 4 As shown, the sample placement slot 221 provided on the first rotating base 22, wherein the placement position of the water storage cup 222 corresponds to the calibration injection mechanism, the placement position of the insulating oil cup 223 corresponds to the insulating oil injection mechanism, the placement position of the fire-resistant oil cup 224 corresponds to the fire-resistant oil injection mechanism, and the placement position of the lubricating oil cup 225 corresponds to the lubricating oil injection mechanism, ensures that when the first rotating base 22 rotates, the samples in each sample placement slot 221 correspond to the automatic injection mechanism 26. In actual use, numbers can be pasted on the sample placement slot 221 and the automatic injection mechanism 26 for correspondence, which is convenient for detection. For different objects to be tested, dedicated injection needles and liquid storage cups are used respectively. Because the water content and viscosity of different types of oil vary greatly, dedicated injection needles 266 are set on the automatic injection mechanism 26 according to the properties of different oils, and different driving forces are set on the electric track according to the properties of the oil, so as to ensure that the speed of extracting and injecting samples is moderate and uniform, and no unnecessary bubbles are generated, thereby further ensuring the accuracy of the detection results.

[0083] In this embodiment, if Figure 4As shown, the water storage cup 222, insulating oil cup 223, fire-resistant oil cup 224, and lubricating oil cup 225 have the same structure, and are all provided with a cup cover 227 on top. A sampling hole is provided in the middle of the cup cover 227, and a silicone pad 228 is provided above the sampling hole. When in use, the silicone pad 228 is opened, and the liquid collection operation is completed through the sampling hole. After the liquid collection is completed, the silicone pad 228 is placed on the sampling hole again to prevent moisture in the air from entering the object to be tested and affecting the detection accuracy.

[0084] In this embodiment, a waste liquid cup placement slot is provided next to each sample placement slot 221 for placing the waste liquid cup 226 .

[0085] The micro-water detector 1 includes an electrolysis cup 11, a rotating mechanism 12, and an analysis and detection mechanism 13. The rotating mechanism 12 includes a second fixed base 121, a second rotating base 122, and a second motor. The second motor is fixedly installed in the middle position of the second fixed base 121, and its output shaft is perpendicular to the upper surface of the second fixed base 121. The bottom end of the second rotating base 122 is connected to the output shaft of the second motor and is located on the upper surface of the second fixed base 121. An electrolysis cup placement groove is provided on the upper surface of the second rotating base 122, and the electrolysis cup 11 is placed in the electrolysis cup placement groove. The analysis and detection mechanism 13 is connected to the electrolysis cup 11, and a water inlet 111 and a sample inlet 112 are respectively provided on the left and right sides above the electrolysis cup 11.

[0086] In this embodiment, if Figure 3 As shown, the second fixed base 121 provides supporting force, and the electrolysis cup 11 is placed in the electrolysis cup placement groove of the second rotating base 122. The second rotating base 122 is rotated on the second fixed base 121 by the operation of the second motor, so that the electrolysis cup 11 rotates. According to the detection step, the water inlet 111 or the sampling port 112 of the electrolysis cup is rotated to the side close to the sampling device to facilitate the injection of calibrated pure water or sample oil. The analysis and detection mechanism 13 is used for the analysis and detection of the water content of the sample of the electrolysis cup 11. The electrolysis cup 11 is respectively provided with the water inlet 111 and the sampling port 112, which effectively avoids the problem that water on the sampling needle of the calibrated sampling mechanism is retained in the sampling port, thereby affecting the detection result of the oil to be tested.

[0087] Specifically, the automatic injection mechanism 26 includes a fixed bracket 261, an injection motor 262, a first electric track 263, a second electric track 264, a third electric track 265, an injection needle 266, a first fixing clamp 267, a first fixing cross bar 268, a second fixing clamp 269, a second fixing cross bar 2610, and a third fixing cross bar 2611. The injection motor 262 is fixedly installed in the mounting hole, and the output end of the injection motor 262 is fixedly connected to the upper middle position of the fixed bracket 261. The front of the fixed bracket 261 is provided with the first electric track 263, the second electric track 264, the third electric track 265, the injection needle 266, the first fixing clamp 267, the first fixing cross bar 268, the second fixing clamp 269, the second fixing cross bar 2610, and the third fixing cross bar 2611. The second electric track 264 and the third electric track 265, a first fixing clamp 267 is installed above the injection needle 266, one end of the first fixing cross bar 268 is connected to the first fixing clamp 267, and the other end is connected to the first electric track 263, a second fixing clamp 269 is installed in the middle position of the injection needle 266, one end of the second fixing cross bar 2610 is connected to the second fixing clamp 269, and the other end is connected to the second electric track 264, one end of the third fixing cross bar 2611 is connected to the lower end of the injection needle 266, and the other end is connected to the third electric track 265.

[0088] Specifically, the injection needle 266 includes an inner core 2661, an inner core handle 2662, a barrel 2663, a needle 2664, and a sleeve 2665. The inner core handle 2662 is arranged at the top of the inner core 2661. A first fixing clip 267 is installed on the inner core handle 2662. The inner core 2661 is slidably connected in the barrel 2663. A second fixing clip 269 is installed on the side of the lower end of the barrel 2663. The needle 2664 is connected to the lower surface of the barrel 2663. The sleeve 2665 is located on the outer side of the lower end of the needle 2664. The sleeve 2665 is connected to one end of the third fixed cross bar 2611.

[0089] In this embodiment, Figure 5 , Figure 6As shown, the fixed bracket 261 can rotate when the injection motor 262 is in the working state, so that the inclination angle of the fixed bracket 261 is the same as the inclination angle of the water inlet 111 or the injection port 112, which is convenient for the injection of calibration water and sample oil. The first fixed cross bar 268, the second fixed cross bar 2610, and the third fixed cross bar 2611 are respectively fixed to the upper, middle and lower parts of the injection needle 266 to provide support for the injection needle 266. At the same time, the first fixed cross bar 268 is connected to the first electric track 263, the second fixed cross bar 268 is connected to the second electric track 264, and the third fixed cross bar 2611 is connected to the third electric track 265. Under the movement of the first electric track 263, the inner core handle 2662 of the injection needle 266 is subjected to the up and down movement. The inner core 2661 moves up and down in the cylinder 2663 under the action of the pulling force of the inner core handle 2662, so as to realize automatic liquid aspiration from the water storage bottle or the sample oil bottle and inject the aspirated calibration water or sample oil into the electrolysis cup 11. After the liquid aspiration is completed, during the movement of the second electric track 264 and the third electric track 265, the first fixed cross bar 268, the second fixed cross bar 2610 and the third fixed cross bar 2611 respectively apply downward pulling force to the injection needle 266 to make the injection needle 266 move downward, and the needle 2664 is close to the water inlet 111 or the injection port 112 of the electrolysis cup 11 to ensure that the liquid is effectively injected. At the same time, the sleeve 2665 is used to fix the needle 2664 to ensure that the needle 2664 does not deviate or bend when the liquid is injected.

[0090] Specifically, the first electric track 263 , the second electric track 264 , and the third electric track 265 have the same structure, and all adopt a synchronous belt module.

[0091] In this embodiment, the synchronous belt module is used to realize the up and down movement of the first electric track 263, the second electric track 264, and the third electric track 265, which is simple to operate and has accurate results.

[0092] Specifically, the central control module 3 adopts a PLC programmable logic controller, which is connected to the first motor, the second motor, the injection motor 262 of four groups of automatic injection mechanisms 26, the first electric track 263, the second electric track 264, and the third electric track 265.

[0093] In this embodiment, if Figure 7 As shown, the micro-water detector 1 and the sampling device 2 are connected to the central control module 3 through their respective interfaces to realize automatic control of sampling. The central control module 3 can also use an ARK-1220L industrial computer. The micro-water detector 1 is realized by modifying a Mitsubishi micro-water meter.

[0094] Embodiment 3

[0095] The above-mentioned embodiment 1 and embodiment 2 are combined to detect the moisture content in the power oil. The specific operation process is as follows:

[0096] S01: Turn on the micro-water detector 1, and when the instrument titration rate is displayed below 0.3, it indicates electrolysis equilibrium, and the instrument calibration begins. At this time, the rotating mechanism 12 of the micro-water detector 1 drives the electrolysis cup 11 to rotate automatically until the water inlet 111 corresponds to the sampling device 2.

[0097] S02: The first rotating base 22 drives the vertical rod 23 to rotate, and rotates to the calibration injection mechanism in the direction of the water inlet 111 of the electrolysis cup. At this time, the water storage cup 222 is directly below the calibration injection mechanism. Under the action of the first electric track 263, the second electric track 264, and the third electric track 265, the needle 2664 is inserted below the liquid level of the water storage cup 222, and the pure water in the water storage cup 222 is automatically extracted. The extraction amount is 0.5 microliters, and it is separated from the pure water cup after extraction. Subsequently, the injection motor 262 rotates to cause the fixed bracket 262 to rotate so that the needle 2664 is located above the waste liquid cup 226, and the pure water just extracted is injected into the waste liquid cup 226. This completes a water sample rinsing process. After three cycles, the pure water rinsing process is completed.

[0098] S03: Calibration of the injection needle According to the process of S02, another 0.5 microliters of pure water is extracted for standby use. The injection motor 262 drives the fixed bracket 261 to rotate, so that the inclination angle of the fixed bracket 261 is the same as the inclination angle of the water inlet 111, so that the calibration injection needle just corresponds to the water inlet 111 on the electrolysis cup 11, which is convenient for the injection of calibration water. Under the action of the first electric track 263, the second electric track 264, and the third electric track 265, the needle 2664 then enters the water inlet 111 and ensures that the needle 2664 is below the electrolyte surface. Then the inner core handle 2 662 continues to slide downward under the action of the first electric track 263, and after pure water is injected into the electrolyte, the calibration injection needle is withdrawn from the electrolysis cup 11 under the action of the first electric track 263, the second electric track 264, and the third electric track 265, completing a pure water calibration. Then, the above steps are repeated twice to complete three calibrations. The calibration is repeated three times in a row, and the results of the three times are all between 475-525 mg / L, which means the calibration is qualified. If the results of three consecutive times are not all between 475-525 mg / L, the step S03 is continued to be looped.

[0099] S04: After the calibration is qualified, the rotating mechanism 12 of the micro-water detector 1 drives the electrolytic cup 11 to rotate automatically, and rotates until the sampling port 112 is close to the sampling device 2. The first rotating base 22 drives the vertical rod 23 to rotate, and rotates until the insulating oil sampling needle is in the direction of the sampling port 112 of the micro-water detector. At this time, the insulating oil cup 223 is directly below the insulating oil sampling mechanism. Under the action of the first electric track 263, the second electric track 264, and the third electric track 265, the needle 2664 is inserted below the liquid level of the insulating oil cup 223, and the insulating oil in the insulating oil cup 223 is automatically extracted. The extraction amount is 1.0 ml, and the insulating oil cup 223 is separated after extraction. Subsequently, the sampling motor 262 rotates to rotate the fixed bracket 262 so that the needle 2664 is located above the waste liquid cup 226, and the insulating oil just extracted is injected into the waste liquid cup 226. This completes a rinsing process of the insulating oil sample. After three cycles, the insulating oil rinsing process is completed.

[0100] S05: The insulating oil injection needle extracts 1.0 ml of insulating oil for standby use according to the process of S04. The injection motor 262 drives the fixed bracket 261 to rotate, so that the inclination angle of the fixed bracket 261 is the same as the inclination angle of the injection port 112, so that the insulating oil injection needle just corresponds to the injection port 112 on the electrolytic cup 11, which is convenient for injecting sample oil. Under the action of the first electric track 263, the second electric track 264, and the third electric track 265, the needle 2664 enters the injection port 112 and ensures that the needle 2664 is below the electrolyte level, and then the inner core handle 2662 continues to slide downward under the action of the first electric track 263, and the insulating oil is injected into the electrolyte. Then, under the action of the first electric track 263, the second electric track 264, and the third electric track 265, the insulating oil injection needle is withdrawn from the electrolytic cup 11, and the insulating oil is tested and analyzed once. Then, the above steps are repeated once to complete the second insulating oil test. At least two injections are performed, and the average of the two results is taken. The two test results need to meet the following conditions:

[0101] When the water content is below 10 mg / L, the allowable difference is 2 mg / L;

[0102] When the water content is between 10-20 mg / L, the allowable difference is 3 mg / L;

[0103] When the water content is between 21-40 mg / L, the allowable difference is 4 mg / L;

[0104] When the water content is greater than 41 mg / L, the allowable difference is 10%.

[0105] S06: The detection method of lubricating oil and fire-resistant oil refers to steps S04 and S05.

[0106] Embodiment 4

[0107] The automatic sampling detection method for water content in oil is used to detect the water content in the running insulating oil, lubricating oil and fire-resistant oil respectively. The detection results are shown in Table 1.

[0108] Table 1 Test results

[0109]

[0110] As shown in Table 1, the results of three pure water calibrations are all between 475-525 g / L.

[0111] The two results of water content in insulating oil were 4.9 mg / L and 4.8 mg / L respectively, with a difference of 0.1 mg / L, which met the allowable difference requirement.

[0112] The water content in the lubricating oil is 15.0 mg / L and 15.3 mg / L, with a difference of 0.3 mg / L, which meets the allowable difference requirement.

[0113] The two results of water content in fire-resistant oil were 23.2 mg / L and 23.6 mg / L respectively, with a difference of 0.4 mg / L, which met the allowable difference requirement.

[0114] In summary, the automatic sampling detection method for water content in oil of the present invention can detect the water content in transformer oil, lubricating oil and fire-resistant oil. It can automatically take samples for analysis and detection, effectively solving the problem of large errors in liquid taking and liquid injection operations. In addition, the micro-water detector is provided with a water inlet and a sampling port, effectively avoiding the influence of pure water retention in the sampling port on the detection result of the water content in the oil to be tested.

[0115] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

[0116] Many other changes and modifications may be made without departing from the concept and scope of the present invention.It should be understood that the present invention is not limited to the specific embodiments, and the scope of the present invention is defined by the appended claims.

Claims

1. An automatic sampling detection method for water content in oil, characterized in that: The following steps are involved: first step: Turn on the micro-water detector (1), wait for the instrument to reach electrolytic equilibrium, and then start calibration of the instrument; The second step is to operate the second rotating base (122) of the trace water detector (1) to bring the water inlet (111) of the electrolysis cup (11) close to the sampling device (2), operate the first rotating base (22) on the sampling device (2) to rotate so that the calibration sampling mechanism is located on a side close to the trace water detector (1), and operate the calibration sampling mechanism to automatically extract pure water from the water storage cup (222) and inject the pure water into the electrolyte of the electrolysis cup (11) for calibration; In the third step, after the calibration is qualified, the second rotating base (122) of the micro-water detector (1) is operated to make the injection port (112) of the electrolysis cup (11) close to the injection device (2), and the first rotating base (22) on the injection device (2) is operated to rotate so that the insulating oil injection mechanism or the lubricating oil injection mechanism or the fire-resistant oil injection mechanism is located on the side close to the micro-water detector (1). The insulating oil injection mechanism or the lubricating oil injection mechanism or the fire-resistant oil injection mechanism is operated to automatically extract the sample oil in the insulating oil cup (223) or the lubricating oil cup (225) or the fire-resistant oil cup (224) and inject the oil into the electrolyte of the electrolysis cup (11), and the water content in the sample oil to be tested is obtained by analysis through the analysis and detection mechanism (13) of the micro-water detector (1).

2. The automatic sampling detection method for water content in oil according to claim 1, characterized in that: In the second step, the specific steps of calibration are: The calibration injection needle (266) of the calibration injection mechanism draws 0.5 microliters of pure water and calibrates three times in succession. The results of the three times are all between 475-525 mg / L, indicating that the calibration is qualified.

3. The automatic sampling detection method for water content in oil according to claim 1, characterized in that: In the third step, the injection needles (266) of the insulating oil injection mechanism, the lubricating oil injection mechanism, and the fire-resistant oil injection mechanism are all 1 ml injection needles, and the steps of injecting the sample oil into the electrolyte of the electrolysis cup are as follows: S01: before injecting the electrolyte, flush the barrel (2663) of the injection needle (266) with the oil sample to be tested for no less than three times; S02: Draw 1 ml of the oil sample to be tested and inject it into the electrolyte through the injection port (112). Inject the sample at least twice and take the average of the two results. The two parallel results must meet the following conditions: When the water content is below 10 mg / L, the allowable difference is 2 mg / L; When the water content is between 10-20 mg / L, the allowable difference is 3 mg / L; When the water content is between 21-40 mg / L, the allowable difference is 4 mg / L; When the water content is greater than 41 mg / L, the allowable difference is 10%.

4. A device using the detection method according to any one of claims 1 to 3, characterized in that: It comprises a trace water detector (1), a sampling device (2), and a central control module (3), wherein the trace water detector (1) and the sampling device (2) are electrically connected to the central control module (3) respectively, and the trace water detector (1) is placed on one side of the sampling device (2); The sample injection device (2) comprises a first fixed base (21), a first rotating base (22), a first motor, a column (23), a first cross arm (24), a second cross arm (25), and an automatic sample injection mechanism (26); the first motor is fixedly mounted in the middle of the first fixed base (21), and its output shaft is perpendicular to the upper surface of the first fixed base (21); the bottom end of the first rotating base (22) is connected to the output shaft of the first motor and is located on the upper surface of the first fixed base (21); the middle of the upper surface of the first rotating base (22) is fixedly mounted The first cross arm (24) and the second cross arm (25) are connected to each other at an angle of 90°. The first cross arm (24) and the second cross arm (25) have the same structure. The middle part of the first cross arm (24) is fixedly installed at the upper end of the column (23). Both ends of the first cross arm (24) and the second cross arm (25) have mounting holes. The automatic sampling mechanism (26) has four groups, namely, a calibration sampling mechanism, an insulating oil sampling mechanism, a lubricating oil sampling mechanism, and a fire-resistant oil sampling mechanism. The four groups of automatic sampling mechanisms (26) have the same structure and are respectively installed in the mounting holes at both ends of the first cross arm (24) and the second cross arm (25). The micro-water detector (1) comprises an electrolysis cup (11), a rotating mechanism (12), and an analysis and detection mechanism (13); the rotating mechanism (12) comprises a second fixed base (121), a second rotating base (122), and a second motor; the second motor is fixedly mounted at a middle position of the second fixed base (121); its output shaft is perpendicular to the upper surface of the second fixed base (121); the bottom end of the second rotating base (122) is connected to the output shaft of the second motor and is located on the upper surface of the second fixed base (121); an electrolysis cup placement groove is provided on the upper surface of the second rotating base (122); the electrolysis cup (11) is placed in the electrolysis cup placement groove; the analysis and detection mechanism (13) is connected to the electrolysis cup (11); a water inlet (111) and a sample inlet (112) are respectively provided on the left and right sides above the electrolysis cup (11).

5. The device for automatic sampling detection of water content in oil according to claim 4, characterized in that: The automatic injection mechanism (26) comprises a fixed bracket (261), an injection motor (262), a first electric track (263), a second electric track (264), a third electric track (265), an injection needle (266), a first fixing clamp (267), a first fixing cross bar (268), a second fixing clamp (269), a second fixing cross bar (2610), and a third fixing cross bar (2611). The injection motor (262) is fixedly mounted in the mounting hole. The output end of the injection motor (262) is fixedly connected to the middle position above the fixed bracket (261). The front side of the fixed bracket (261) is provided with the first electric track (263), the second electric track (264), the third electric track (265), the injection needle (266), the first fixing clamp (267), the first fixing cross bar (268), the second fixing clamp (269), the second fixing cross bar (2610), and the third fixing cross bar (2611). A second electric track (264) and a third electric track (265), a first fixing clamp (267) is installed above the injection needle (266), one end of the first fixing cross bar (268) is connected to the first fixing clamp (267), and the other end is connected to the first electric track (263), a second fixing clamp (269) is installed in the middle position of the injection needle (266), one end of the second fixing cross bar (2610) is connected to the second fixing clamp (269), and the other end is connected to the second electric track (264), one end of the third fixing cross bar (2611) is connected to the lower end of the injection needle (266), and the other end is connected to the third electric track (265).

6. The device for automatic sampling detection of water content in oil according to claim 5, characterized in that: The injection needle (266) comprises an inner core (2661), an inner core handle (2662), a barrel (2663), a needle (2664), and a sleeve (2665); the inner core handle (2662) is arranged at the top of the inner core (2661); a first fixing clamp (267) is installed on the inner core handle (2662); the inner core (2661) is slidably connected in the barrel (2663); a second fixing clamp (269) is installed on the side of the lower end of the barrel (2663); the needle (2664) is connected to the lower surface of the barrel (2663); the sleeve (2665) is located on the outer side of the lower end of the needle (2664); and the sleeve (2665) is connected to one end of a third fixed cross bar (2611).

7. The device for automatic sampling detection of water content in oil according to claim 4, characterized in that: The first rotating base (22) is provided with four sample placement slots (221) for placing a water storage cup (222), an insulating oil cup (223), a fire-resistant oil cup (224), and a lubricating oil cup (225), respectively. The water storage cup (222), the insulating oil cup (223), the fire-resistant oil cup (224), and the lubricating oil cup (225) have the same structure, and are all provided with a cup cover (227) on top. A sampling hole is provided in the middle of the cup cover (227), and a silicone pad (228) is provided above the sampling hole.

8. The device for automatic sampling detection of water content in oil according to claim 4, characterized in that: The first electric track (263), the second electric track (264), and the third electric track (265) have the same structure and all use synchronous belt modules.

9. The device for automatic sampling detection of water content in oil according to claim 4, characterized in that: The central control module adopts a PLC programmable logic controller, and the PLC programmable logic controller is connected to the first motor, the second motor, the injection motors (262) of four groups of automatic injection mechanisms (26), the first electric track (263), the second electric track (264), and the third electric track (265).

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