A kind of insulating oil furfural content determination instrument based on infrared absorption method

Abstract

This invention relates to the field of furfural detection technology, and more particularly to an instrument for determining the furfural content in insulating oil based on infrared absorption method. It includes a protective shell, a cover plate rotatably connected to the protective shell, a pumping module and symmetrically distributed spectrometers installed inside the protective shell, a feed pipe fixed to the protective shell, a guide pipe provided with the feed pipe, a fixing shell within the protective shell, a detection dish within the fixing shell, a transition pipe within the detection dish, a delivery pipe connected to the inlet of the pumping module, and an oscillation mechanism within the protective shell. This invention integrates the detection dish, spectrometer, and the oscillation operation of the insulating oil into the protective shell, allowing the protective shell to be placed directly at the point of detection. This eliminates the need for multiple transfers of the insulating oil, making the detection process more convenient. Simultaneously, the insulating oil is prevented from contacting the external environment, thereby reducing the probability of contamination and ensuring the reliability of the detection results.

Description

Technical Field

[0001] This invention relates to the field of furfural detection technology, and in particular to an instrument for determining the furfural content in insulating oil based on infrared absorption method. Background Technology

[0002] Insulating oil is a crucial medium for insulation and cooling in oil-filled electrical equipment (such as transformers). During long-term operation, the solid insulating materials inside the equipment (such as insulating paper and insulating paperboard) gradually age due to various stresses, producing furfural. As a major characteristic product of cellulose degradation, furfural is soluble in insulating oil, and its content has a stable correlation with the decrease in the degree of polymerization of the insulating material. Therefore, accurately determining the furfural content in the oil is an important method for assessing the aging state of the insulation and predicting the remaining life of the equipment.

[0003] Currently, the detection of furfural in insulating oil mainly relies on laboratory analytical techniques such as high-performance liquid chromatography (HPLC) (infrared absorption method). The general procedure includes on-site sampling, multiple transports, and sample pretreatment in the laboratory (such as shaking), followed by analysis using a chromatogram to obtain the results. However, this laboratory-centered model has significant drawbacks, especially the susceptibility of samples to contamination or compositional changes during transport, which seriously affects the accuracy and reliability of the detection results. Summary of the Invention

[0004] In order to overcome the shortcomings mentioned in the background art, the present invention provides an instrument for determining the furfural content in insulating oil based on infrared absorption method.

[0005] The technical solution of the present invention is as follows: an instrument for determining the furfural content in insulating oil based on infrared absorption method, comprising a protective shell, a cover plate rotatably connected to the protective shell, a pumping module and symmetrically distributed spectrometers installed inside the protective shell, a feed pipe fixed to the protective shell, a guide pipe provided on the feed pipe, a fixed shell provided inside the protective shell, a detection dish provided inside the fixed shell, the detection dish being located between the symmetrically distributed spectrometers, a transition pipe provided on the detection dish, a conveying pipe connected to the inlet of the pumping module for discharging the material in the detection dish, and an oscillation mechanism provided inside the protective shell for vibrating the material.

[0006] As an improvement to the above solution, the oscillation mechanism includes a support frame, which is fixedly connected to the protective shell. The support frame is ball-connected to the oscillation shell, and the guide pipe is connected to the oscillation shell. A drive module is installed inside the support frame, which is used to drive the oscillation shell to swing circumferentially. An electric control valve is installed on the lower side of the oscillation shell, and a transition pipe is connected to the electric control valve. A pressure boosting valve is installed on the transition pipe.

[0007] As an improvement to the above solution, a first intercepting block is fixedly connected to one end of the feed tube located inside the oscillating shell to block the material.

[0008] As an improvement to the above solution, it also includes a female connector, which is fixedly connected to and connected to the side of the test dish near the transition tube. The side of the test dish away from the transition tube is fixedly connected to and connected to a first male connector. The transition tube is fixedly connected to and connected to a second male connector. When the second male connector is connected to the female connector, the test dish and the transition tube are connected. The protective shell is provided with a docking assembly for connecting the first male connector to the delivery tube.

[0009] As an improvement to the above solution, a second intercepting head is fixedly connected to the connection point between the detection dish and the connecting female head, and the second intercepting head is used to block the material.

[0010] As an improvement to the above solution, the docking assembly includes a mounting bracket, which is fixedly connected to the protective shell. The mounting bracket is rotatably and slidably connected to a sliding sleeve. The sliding sleeve is connected to the delivery pipe through the mounting bracket. A sealing head is slidably connected inside the sliding sleeve, and a first elastic element is provided between the two. The sliding sleeve is used to dock with the first connecting male, and the first connecting male is used to squeeze the sealing head. A first electric push rod is fixedly connected inside the protective shell. A first block is fixedly connected to the telescopic end of the first electric push rod. A second block is fixedly connected to the outside of the sliding sleeve, and the first block is used to squeeze the second block.

[0011] As an improvement to the above solution, a second electric push rod is also included. The second electric push rod is hinged inside the protective shell. A fixed frame is fixed to the telescopic end of the second electric push rod. The fixed frame is hinged to symmetrically distributed lifting blocks. The lifting blocks are used to push the fixed shell to move. Symmetrically distributed limiting members are fixed inside the protective shell. Connecting members are fixed to the lifting blocks. The limiting members are slidably connected to the adjacent connecting members. The symmetrically distributed limiting members are used to guide the fixed shell. A second elastic member is provided between the limiting members and the fixed shell.

[0012] As an improvement to the above solution, the side of the detection dish is connected to an air vent valve.

[0013] As an improvement to the above solution, a pull rope is also included, which is fixed to the cover plate, and the end of the pull rope away from the cover plate is fixed to a sliding part on the fixed shell located within one of the limiting members.

[0014] As an improvement to the above solution, an electrically controlled three-way valve is also included. The electrically controlled three-way valve is connected between the feed pipe and the guide pipe, and the electrically controlled three-way valve is connected to a diversion pipe, which is connected to the liquid inlet of the pumping module.

[0015] The present invention has the following advantages: By integrating the detection dish, spectrometer, and the operation of oscillating the insulating oil into the protective shell, the protective shell can be placed directly at the test site, eliminating the need for multiple transfers of the insulating oil and making the test process more convenient. At the same time, the insulating oil will not come into contact with the external environment, thereby reducing the probability of contamination of the insulating oil and ensuring the reliability of the test results.

[0016] This invention involves installing female connectors and a first male connector on both sides of the testing dish, and utilizing the cooperation of a second male connector and a docking assembly. When the insulating oil needs to be tested at a deeper level, the testing dish can be directly removed and left for subsequent testing. During this process, the insulating oil will not come into contact with the outside world, thus preventing contamination and ensuring the reliability of the results of subsequent in-depth testing.

[0017] This invention adjusts the testing dish to a horizontal position during the injection of insulating oil. The horizontally placed testing dish allows the insulating oil to rise slowly within it, facilitating the expulsion of gas from the testing dish and reducing the probability of air bubbles remaining on the inner wall of the testing dish. This reduces the amount of air bubbles in the testing dish, minimizes their impact on the testing results, and ensures the reliability of the testing results. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a three-dimensional structural cross-sectional view of the protective shell of the present invention;

[0020] Figure 3 This is a three-dimensional structural diagram of the feed pipe and guide pipe of the present invention;

[0021] Figure 4 This is a three-dimensional structural diagram of the fixing shell and the detection dish of the present invention;

[0022] Figure 5 This is a three-dimensional structural schematic diagram of the oscillating shell of the present invention;

[0023] Figure 6 This is a three-dimensional structural diagram of the pull rope of the present invention;

[0024] Figure 7 This is a three-dimensional structural diagram of the detection dish and transition tube of the present invention;

[0025] Figure 8 This is a three-dimensional structural diagram of the mounting bracket and sliding sleeve of the present invention;

[0026] Figure 9 This is a three-dimensional structural diagram of the second interceptor head of the present invention;

[0027] Figure 10 This is a three-dimensional structural diagram of the sliding sleeve and sealing head of the present invention;

[0028] Figure 11 This is a three-dimensional structural diagram of the mounting bracket and sealing head of the present invention;

[0029] Figure 12 This is a three-dimensional structural diagram of the female connector and the first male connector of the present invention;

[0030] Figure 13 This is a three-dimensional structural diagram of the lifting block and limiting member of the present invention.

[0031] The following are the labels in the diagram: 1. Protective shell, 2. Cover plate, 3. Spectrometer, 4. Pumping module, 5. Feed pipe, 6. Guide pipe, 7. Fixed shell, 8. Detection dish, 9. Transition pipe, 10. Conveying pipe, 21. Support frame, 22. Vibrating shell, 24. Drive module, 25. Electric valve, 26. Pressure booster valve, 31. First intercepting block, 41. Connecting female, 42. First connecting male, 43. Second connecting male, 51. Second intercepting head, 61. Mounting bracket, 62. Sliding sleeve, 63. Sealing head, 65. First electric push rod, 66. First block, 67. Second block, 71. Second electric push rod, 72. Fixed frame, 73. Lifting block, 74. Limiting component, 75. Connecting component, 81. Air outlet valve, 92. Pull rope, 101. Electric three-way valve, 102. Diverter pipe. Detailed Implementation

[0032] The above-described solution will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of this application. The implementation conditions used in the embodiments may be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are generally those in routine experiments.

[0033] Example 1

[0034] An instrument for determining furfural content in insulating oil based on infrared absorption method, such as... Figures 1-9As shown, the system includes a protective shell 1, with a control terminal and data display on its upper side. A cover plate 2 is rotatably connected to the protective shell 1. A pumping module 4 and symmetrically distributed spectrometers 3 are installed inside the protective shell 1. The spectrometers 3 use infrared absorption to detect the insulating oil. The pumping module 4 is an existing structure. A feed pipe 5 is fixed to the right side of the protective shell 1, communicating with the transformer's oil drain port. This oil drain port is an existing structure. The feed pipe 5 is equipped with a guide pipe 6. A fixed shell 7 is installed inside the protective shell 1, and a detection dish 8 is installed inside the fixed shell 7. The detection dish 8 is used to hold the insulating oil and is a transparent shell. In this embodiment, the detection... An exhaust valve is provided on the upper side of the test dish 8. This exhaust valve is used to discharge the gas inside the test dish 8 during the process of injecting insulating oil into the test dish 8. The test dish 8 is located between symmetrically distributed spectrometers 3. The test dish 8 is provided with a transition pipe 9. The liquid inlet of the pumping module 4 is connected to a delivery pipe 10. The delivery pipe 10 is used to discharge the material inside the test dish 8. An oscillation mechanism is provided inside the protective shell 1. The oscillation mechanism is used to vibrate the material. In this embodiment, the feed pipe 5 is connected to the guide pipe 6, the protective shell 1 is fixedly connected to the fixed shell 7, the fixed shell 7 is fixedly connected to the test dish 8, the test dish 8 is connected to the transition pipe 9, and the delivery pipe 10 is connected to the test dish 8.

[0035] like Figures 1-5 As shown, the oscillation mechanism includes a support frame 21, which is fixed inside the protective shell 1. The support frame 21 is ball-jointed to an oscillation shell 22. A guide pipe 6 communicates with the oscillation shell 22. Corrugated pipes are provided on the left side of the guide pipe 6 and at the rear of the transition pipe 9 to accommodate the oscillation of the oscillation shell 22. A drive module 24 is installed inside the support frame 21. The drive module 24 consists of a servo motor, two meshing gears, two rings, and a U-shaped frame (e.g., ...). Figure 5 As shown), one gear is fixedly connected to the output shaft of the servo motor, and the other gear is fixedly connected to the oscillating housing 22, with the oscillating housing 22 located at the eccentricity of the other gear. Two rings are rotatably connected to the two gears respectively, and both rings are fixedly connected to the U-shaped frame. The two rings and the U-shaped frame are used to ensure that the two gears are always meshed. The drive module 24 is used to drive the oscillating housing 22 to swing circumferentially. An electrically controlled valve 25 is installed on the lower side of the oscillating housing 22 to control the flow of insulating oil in the oscillating housing 22. The rear side of the transition pipe 9 is connected to the electrically controlled valve 25. A pressure boosting valve 26 is installed on the transition pipe 9. The pressure boosting valve 26 is used to pressurize the insulating oil flowing in the transition pipe 9, so that the insulating oil has flow pressure.

[0036] like Figure 5 As shown, a first intercepting block 31 is fixed to the left end of the feed tube 6 to block the insulating oil, so that the insulating oil flows downward along the inner wall of the oscillating shell 22, reducing the generation of air bubbles in the insulating oil.

[0037] The working principle of this embodiment:

[0038] When this equipment is needed to test the furfural content in insulating oil, first move the equipment to the transformer to be tested, open the transformer's oil drain port and connect it to the feed pipe 5. Then, the insulating oil flows into the oscillating shell 22 through the feed pipe 5 and the guide pipe 6. When the insulating oil in the oscillating shell 22 reaches the specified height, close the transformer's oil drain port, and the insulating oil in the transformer will no longer flow into the oscillating shell 22.

[0039] During the process of insulating oil entering the oscillating shell 22 from the feed pipe 6, the first intercepting block 31 blocks the insulating oil, preventing it from flowing to the middle of the oscillating shell 22 and causing the insulating oil to flow downwards along the inner wall of the oscillating shell 22. This reduces the number of air bubbles generated by the falling insulating oil (if the insulating oil contains air bubbles, when the light emitted by the spectrometer 3 passes through the air bubbles, the direction of the light will change. The light scattering caused by the air bubbles is non-selective and will affect the entire spectral band, causing the spectral baseline (background) to become unstable and rise. At the same time, the increase in "apparent absorbance" caused by the air bubbles will be directly superimposed on the true absorbance of furfural. The instrument cannot distinguish whether the light is absorbed by furfural molecules or light "blocked" by the air bubbles, so it will incorrectly calculate a higher furfural concentration. Therefore, air bubbles will affect the detection results, making the detection results unrepresentative).

[0040] After a certain amount of insulating oil is injected into the oscillating shell 22, the control terminal starts the drive module 24. The drive module 24 drives the oscillating shell 22 to swing circumferentially, thereby oscillating the insulating oil inside and causing the air bubbles in the insulating oil to be discharged.

[0041] After the insulating oil is oscillated for a fixed time, the control terminal opens the solenoid valve 25 and the booster valve 26, allowing the insulating oil in the oscillation shell 22 to flow into the transition pipe 9 and pass through the booster valve 26. Then the insulating oil is pressurized by the booster valve 26 and enters the detection dish 8. After the insulating oil fills the detection dish 8, the control terminal closes the solenoid valve 25 and the booster valve 26.

[0042] After the testing dish 8 is filled with insulating oil, the control terminal starts two spectrometers 3 to detect the furfural content in the insulating oil. The detected values ​​are transmitted to the numerical display. After the detection is completed, the control terminal starts the pumping module 4. The pumping module 4 extracts the insulating oil from the testing dish 8 through the delivery pipe 10. Then the control terminal shuts off the pumping module 4, thus completing the detection of the insulating oil.

[0043] Example 2

[0044] Based on Example 1, after testing the furfural content in the insulating oil, if the test result is substandard, the tested insulating oil needs to be removed and transferred to the laboratory for detailed testing. If the tested insulating oil is directly removed and transferred to other containers for transport, the insulating oil is easily contaminated during this process, which will lead to inaccurate subsequent test results. The following solution is proposed:

[0045] like Figures 4-13 As shown, it also includes a female connector 41, which is fixedly connected to and connected to the rear side of the detection dish 8. A first male connector 42 is fixedly connected to and connected to the front side of the detection dish 8, and a second male connector 43 is fixedly connected to and connected to the front side of the transition tube 9. The female connector 41, the first male connector 42, and the second male connector 43 are all existing quick-connect plugs. When the second male connector 43 is connected to the female connector 41, the detection dish 8 and the transition tube 9 are connected. A docking assembly for connecting the first male connector 42 and the delivery tube 10 is provided inside the protective shell 1. In this embodiment, the detection dish 8 and the transition tube 9 are connected to the female connector 41 through the second male connector 43, and the detection dish 8 and the delivery tube 10 are connected to the docking assembly through the first male connector 42.

[0046] like Figures 8-11 and Figure 13 As shown, the docking assembly includes a mounting bracket 61. Two connecting brackets, symmetrically distributed front and rear, are fixedly connected inside the protective shell 1. The mounting bracket 61 is fixed to the connecting bracket on the front side inside the protective shell 1. A sliding sleeve 62 is rotatably and slidably connected to the rear side of the mounting bracket 61. The sliding sleeve 62 communicates with the conveying pipe 10 through the mounting bracket 61. A sealing head 63 is slidably connected inside the sliding sleeve 62, and a first elastic element, a spring, is provided between them to drive the sealing head 63 to reset. The sealing head 63 is used to seal the sliding sleeve 62. The sliding sleeve 62 is used to dock with a first connecting male head 42. The head 42 is used to squeeze the sealing head 63. When the first connecting male head 42 squeezes the sealing head 63 and causes the sealing head 63 to release the sealing of the sliding sleeve 62, the sliding sleeve 62 communicates with the first connecting male head 42. The first electric push rod 65 is fixedly connected inside the protective shell 1. The first electric push rod 65 is an existing structure. The telescopic end of the first electric push rod 65 is fixedly connected to the first block 66. The outer side of the sliding sleeve 62 is fixedly connected to the second block 67. The first block 66 is used to squeeze the second block 67. The opposing sides of the first block 66 and the second block 67 are provided with inclined surfaces. In this embodiment, the fixed shell 7 and the detection dish 8 are detachably connected.

[0047] In this embodiment, the detection dish 8, the female connector 41, and the first male connector 42 are treated as a container module. When it is necessary to retain the insulating oil after testing, the entire container module is removed and a new container module is installed. The specific operation process is as follows:

[0048] When testing the insulating oil, first take out a container module, insert the test dish 8 into the fixed shell 7, and then insert the second male connector 43 into the female connector 41. After the two are connected, the test dish 8 and the transition tube 9 are connected through the female connector 41 and the second male connector 43. Then, insert the first male connector 42 into the sliding sleeve 62, so that the first male connector 42 contacts the sealing head 63. At this time, the rear side of the sealing head 63 fits against the sliding sleeve 62, thus sealing the sliding sleeve 62. This completes the container module installation operation.

[0049] After installation, when testing the insulating oil, repeat the oil filling operation described in the above embodiment. The insulating oil in the transition tube 9 enters the testing dish 8 through the female connector 41 and the second male connector 43. Since the sealing head 63 blocks the sliding sleeve 62, the insulating oil in the testing dish 8 will not flow out. After the testing dish 8 is filled with insulating oil, testing begins. After testing, when a sample of this portion of the insulating oil needs to be retained, directly separate the female connector 41 and the second male connector 43, as well as the first male connector 42 and the sliding sleeve 62. Then, remove the testing dish 8 from the fixed shell 7 and transfer the entire container module to the laboratory. During this process, the insulating oil will not be replaced with a different container or come into contact with external gases, thus preventing contamination of the retained insulating oil sample. After being transferred to the laboratory, the insulating oil is then tested again.

[0050] If it is not necessary to retain the tested insulating oil sample, the control terminal activates the first electric push rod 65. The telescopic end of the first electric push rod 65 pushes the first block 66 upward, and the first block 66 squeezes the second block 67, causing the second block 67 to drive the sliding sleeve 62 to move backward synchronously. During the backward movement of the sliding sleeve 62, the sliding sleeve 62 pushes the sealing head 63 to move through the first elastic element, causing the sealing head 63 to squeeze the first connecting male 42, causing the first connecting male 42 to open. After the first connecting male 42 opens, the first connecting male 42 continues to block the sealing head 63, preventing the sealing head 63 from moving. Then, as the sliding sleeve 62 continues to move, the sliding sleeve 62 and the sealing head 63 move relative to each other, and the first elastic element is compressed. At this time, a gap is created between the sliding sleeve 62 and the sealing head 63, that is, the sealing head 63 releases its blockage of the sliding sleeve 62. At this time, the sliding sleeve 62 and the first connecting male 42 are in a connected state.

[0051] While the first electric push rod 65 is activated, the control terminal controls the pumping module 4 to extract the insulating oil from the test dish 8 through the delivery pipe 10, the sliding sleeve 62 and the first connecting male 42, and repeats the above operation to continue testing other insulating oils.

[0052] Example 3

[0053] Based on Example 2, such as Figures 5-10 and Figure 13 As shown, it also includes a second electric push rod 71, which is an existing drive structure. The fixed part of the second electric push rod 71 is hinged to the protective shell 1. The telescopic end of the second electric push rod 71 is fixedly connected to a fixed frame 72. The fixed frame 72 is hinged to two symmetrically distributed lifting blocks 73. The upper side of the lifting block 73 is provided with an arc surface. The lifting block 73 is used to push the fixed shell 7 to move. The upper side of the two connecting frames inside the protective shell 1 is fixedly connected to a limiting member 74. The back side and the lower side of the two limiting members 74 are provided with arc-shaped sliding grooves. The center of the circle where the arc-shaped sliding groove is located is located on the central axis of the transition tube 9. The lifting block 73 is fixedly connected to a connecting member 75. The two arc-shaped sliding grooves on the limiting member 74 are slidably connected to the adjacent connecting member 75. The symmetrically distributed limiting members 74 are used to guide the fixed shell 7. A second elastic member is provided between the limiting member 74 and the fixed shell 7. The second elastic member is a spring, which is used to drive the fixed shell 7 to reset.

[0054] like Figure 7 and Figure 12 As shown, the left side of the test dish 8 is connected to an exhaust valve 81. The exhaust valve 81 is used to discharge the gas in the test dish 8, so that the insulating oil can enter the test dish 8. The exhaust valve 81 is an existing valve-type exhaust valve.

[0055] like Figure 9 and Figure 12 As shown, a second intercepting head 51 is fixedly connected at the connection point between the detection dish 8 and the connecting head 41. The second intercepting head 51 is used to block the material.

[0056] The working principle of this embodiment:

[0057] Following the working principle of Embodiment 2, after the container module is installed, the control terminal opens the second electric push rod 71. The telescopic end of the second electric push rod 71 pushes the fixed frame 72 to move upward. The fixed frame 72 drives the two lifting blocks 73 to move upward synchronously. The two lifting blocks 73 respectively drive the adjacent connecting parts 75 to move upward. The two lifting blocks 73 jointly push the fixed shell 7 to move. At the same time, the fixed shell 7 slides along the limiting part 74, and the connecting part 75 slides along the groove on the adjacent limiting part 74, so that the lifting blocks 73 remain vertical and move upward. At the same time, during the upward movement of the lifting blocks 73, the second electric push rod 71 will swing adaptively, and the lifting blocks 73 will rotate adaptively with the fixed frame 72.

[0058] As the two lifting blocks 73 push the fixed shell 7 upward, the fixed shell 7 rotates around the central axis of the transition tube 9, rotating itself from a vertical state to a horizontal state. The fixed shell 7 compresses the second elastic element on it, and the fixed shell 7 drives the detection dish 8 to rotate. After the detection dish 8 rotates to a horizontal state, the control terminal closes the second electric push rod 71, and then repeats the above process to inject insulating oil into the detection dish 8.

[0059] During the process of injecting insulating oil into the testing dish 8, the insulating oil flows into the testing dish 8 from the connecting female head 41. During this process, the second intercepting head 51 blocks the insulating oil, allowing it to directly contact the lower side of the testing dish 8 and gradually cover it, while keeping the liquid level basically horizontal. As the insulating oil is gradually injected, the height of the insulating oil in the testing dish 8 rises slowly, similar to a piston smoothly pushing upwards. During this process, the insulating oil compresses the gas in the testing dish 8. The gas escapes vertically upwards and directly reaches the gas outlet valve 81. Squeezing is performed to open the vent valve 81, allowing gas to escape from the vent valve 81. This facilitates the removal of gas from the detection dish 8 and reduces the amount of residual air bubbles in the detection dish 8. During this process, the flow direction of the insulating oil (horizontal propagation) and the gas escape direction (vertical upward) are orthogonal and do not interfere with each other. In this way, the gas-liquid two-phase interface is stable, and the gas has a clear and smooth escape channel, so it is not easy to generate air bubbles. This reduces the number of air bubbles on the upper and lower sides (i.e., the circular side) of the detection dish 8, thereby reducing the impact of air bubbles on the detection results and ensuring the reliability of the detection results.

[0060] After the insulating oil is injected, the control terminal controls the second electric push rod 71 to retract its telescopic end. The telescopic end of the second electric push rod 71 drives the lifting block 73 to reset through the fixing frame 72, so that the two lifting blocks 73 lose the pushing force on the fixing shell 7. The fixing shell 7 resets and rotates under the action of the second elastic element, thereby rotating the detection dish 8 from a horizontal state to a vertical state. After the detection dish 8 is reset to a vertical state, the insulating oil in the detection dish 8 is tested. By resetting the detection dish 8 to a vertical state, the residual air bubbles in the insulating oil in the detection dish 8 float upward and accumulate in the upper part of the detection dish 8. The air bubbles in the upper part will not affect the test.

[0061] Example 4

[0062] Based on Example 3, such as Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, it also includes a pull rope 92, which is fixed to the cover plate 2, and the lower end of the pull rope 92 is fixed to the rear side of the fixed shell 7.

[0063] After the insulating oil in the testing dish 8 has been tested, it is necessary to combine the test data and the state of the insulating oil to determine whether a sample needs to be retained for further testing. When it is necessary to know the state of the insulating oil, the cover plate 2 is opened, the cover plate 2 is rotated and the pull rope 92 is pulled. The pull rope 92 pulls the fixing shell 7, causing the fixing shell 7 to slide along the two limiting members 74. The fixing shell 7 compresses the second elastic member on it, that is, repeating the process of rotating the fixing shell 7 in the above embodiment 3, so that the testing dish 8 changes from a vertical state to a horizontal state, so that the left circular side of the testing dish 8 faces upward in the vertical state, which makes it easier to observe the state of the insulating oil. After the observation is completed, the observation results are combined with the test results to determine whether to retain the insulating oil in the testing dish 8 for further testing. If a sample needs to be retained, the process of removing the testing dish 8 in embodiment 2 is repeated. If a sample does not need to be retained, the process of draining the insulating oil in the testing dish 8 in embodiment 2 is repeated. After that, the cover plate 2 is closed, and the fixing shell 7 is reset under the action of the second elastic member on it, and the testing dish 8 is restored to a vertical state.

[0064] like Figures 2-4 As shown, it also includes an electrically controlled three-way valve 101. The electrically controlled three-way valve 101 is an existing structure. The electrically controlled three-way valve 101 is connected between the feed pipe 5 and the guide pipe 6. In this embodiment, the feed pipe 5 and the guide pipe 6 are connected through the electrically controlled three-way valve 101. Another flow port of the electrically controlled three-way valve 101 is connected to a diversion pipe 102. The diversion pipe 102 is connected to the liquid inlet of the pumping module 4. In this embodiment, the liquid outlet of the pumping module 4 is connected to the oil tank of the transformer.

[0065] When testing the insulating oil in a transformer, since the oil drain port is located at the bottom of the transformer, impurities will accumulate in the insulating oil after long-term use. If the insulating oil at the bottom is tested directly, the test results will not be representative and will be distorted.

[0066] Following the workflow of Example 1, after connecting the transformer's oil drain port to the feed pipe 5, the control terminal controls the electrically controlled three-way valve 101 to disconnect the feed pipe 5 from the guide pipe 6 and connect the feed pipe 5 to the shunt pipe 102. Subsequently, the control terminal starts the pumping module 4. The pumping module 4 extracts the insulating oil from the transformer through the shunt pipe 102, the electrically controlled three-way valve 101, and the feed pipe 5. At the same time, the pumping module 4 pumps this portion of insulating oil back into the transformer's oil conservator. After the pumping module 4 has been working for a fixed time, it stops and controls the electrically controlled three-way valve 101 to connect the feed pipe 5 to the guide pipe 6 and disconnect the feed pipe 5 from the shunt pipe 102. Then, the process of Example 1 is repeated to start testing the insulating oil. By extracting the insulating oil from the bottom of the transformer and selecting the insulating oil in the middle of the transformer for testing, the test results are more representative and the reliability of the test results is improved.

[0067] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments.

Claims

1. An instrument for determining furfural content in insulating oil based on infrared absorption method, characterized in that it includes: The device has a protective shell (1), which is rotatably connected to a cover plate (2). A pumping module (4) and symmetrically distributed spectrometers (3) are installed inside the protective shell (1). A feed pipe (5) is fixedly connected to the protective shell (1). A guide pipe (6) is provided on the feed pipe (5). A fixed shell (7) is provided inside the protective shell (1). A detection dish (8) is provided inside the fixed shell (7). The detection dish (8) is located between the symmetrically distributed spectrometers (3). A transition pipe (9) is provided on the detection dish (8). The inlet of the pumping module (4) is connected to a conveying pipe (10). The conveying pipe (10) is used to discharge the material in the detection dish (8). An oscillation mechanism is provided inside the protective shell (1). The oscillation mechanism is used to vibrate the material. The oscillation mechanism includes an oscillation shell (22), the feed pipe (6) is connected to the oscillation shell (22), an electric control valve (25) is installed on the lower side of the oscillation shell (22), and the transition pipe (9) is connected to the electric control valve (25); It also includes a female connector (41), which is fixedly connected to and connected to the side of the test dish (8) near the transition tube (9). The side of the test dish (8) away from the transition tube (9) is fixedly connected to and connected to a first male connector (42). The transition tube (9) is fixedly connected to and connected to a second male connector (43). When the second male connector (43) is connected to the female connector (41), the test dish (8) and the transition tube (9) are connected. The protective shell (1) is provided with a docking assembly for connecting the first male connector (42) to the delivery tube (10). The docking assembly includes a mounting bracket (61), which is fixedly connected to the protective shell (1). The mounting bracket (61) is rotatable and slidably connected to a sliding sleeve (62). The sliding sleeve (62) is connected to the delivery pipe (10) through the mounting bracket (61). A sealing head (63) is slidably connected inside the sliding sleeve (62), and a first elastic element is provided between the two. The sliding sleeve (62) is used to dock with the first connecting male (42). The first connecting male (42) is used to squeeze the sealing head (63). When the first connecting male (42) squeezes the sealing head (63) and causes the sealing head (63) to release from the sliding sleeve (62), the sealing head (63) releases its contact with the sliding sleeve (63). 2) During the sealing process, the sliding sleeve (62) is connected to the first connecting male (42); a first electric push rod (65) is fixedly connected inside the protective shell (1), a first block (66) is fixedly connected to the telescopic end of the first electric push rod (65), and a second block (67) is fixedly connected to the outside of the sliding sleeve (62). The first block (66) is used to squeeze the second block (67), so that the second block (67) drives the sliding sleeve (62) to move backward synchronously. During the backward movement of the sliding sleeve (62), the sliding sleeve (62) pushes the sealing head (63) to move through the first elastic element, so that the sealing head (63) squeezes the first connecting male (42); It also includes a second electric push rod (71), which is hinged inside the protective shell (1). The telescopic end of the second electric push rod (71) is fixedly connected to a fixing frame (72). The fixing frame (72) is hinged to symmetrically distributed lifting blocks (73). The lifting blocks (73) are used to push the fixing shell (7) upward. Symmetrically distributed limiting members (74) are fixedly connected inside the protective shell (1). The limiting members (74) are provided with arc-shaped grooves on their back side and lower side. The center of the circle where the arc-shaped groove is located is located on the central axis of the transition tube (9). The lifting blocks (73) are fixedly connected to connecting members (75). The limiting members (74) are slidably connected to the adjacent connecting members (75). The limiting member (74) distributed in the form of a fixed shell (7) is used to guide the fixed shell (7). A second elastic member is provided between the limiting member (74) and the fixed shell (7) to drive the fixed shell (7) to reset. During the process of the two lifting blocks (73) pushing the fixed shell (7) to move upward, the fixed shell (7) rotates around the central axis of the transition tube (9) and rotates itself from a vertical state to a horizontal state. The fixed shell (7) compresses the second elastic member on it. The fixed shell (7) drives the detection dish (8) to rotate. After the detection dish (8) rotates to a horizontal state, the control terminal closes the second electric push rod (71) and injects insulating oil into the detection dish (8). The side of the detection dish (8) is connected to an air vent valve (81). It also includes an electrically controlled three-way valve (101), which is connected between the feed pipe (5) and the guide pipe (6). The electrically controlled three-way valve (101) is connected to a diversion pipe (102), which is connected to the liquid inlet of the pumping module (4).

2. The instrument for determining furfural content in insulating oil based on infrared absorption method according to claim 1, characterized in that, The oscillation mechanism includes a support frame (21), which is fixed inside the protective shell (1). The support frame (21) is ball-connected to the oscillation shell (22). A drive module (24) is installed inside the support frame (21). The drive module (24) is used to drive the oscillation shell (22) to swing circumferentially. A pressure boosting valve (26) is installed on the transition pipe (9).

3. The instrument for determining furfural content in insulating oil based on infrared absorption method according to claim 2, characterized in that, The feed tube (6) is fixed to one end inside the oscillating shell (22) with a first intercepting block (31) for blocking the material.

4. The instrument for determining furfural content in insulating oil based on infrared absorption method according to claim 3, characterized in that, A second interceptor head (51) is fixedly connected to the connection point between the detection dish (8) and the connecting female head (41). The second interceptor head (51) is used to block the material.

5. A furfural content analyzer for insulating oil based on infrared absorption method according to claim 4, characterized in that, It also includes a pull rope (92), which is fixed to the cover plate (2), and one end of the pull rope (92) away from the cover plate (2) is fixed to a sliding part of the fixed shell (7) located inside one of the limiting members (74).

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