A moisture detection device for an insulating oil dehydration line

Abstract

The present application belongs to the technical field of insulating oil production, and particularly relates to a moisture detection device for an insulating oil dehydration line. The device adopts a four-layer mold body upper and lower superposition assembly structure, and comprises an upper mold piece, an intermediate fixed mold piece, a rotatable intermediate movable mold piece and a lower mold piece arranged in sequence. The intermediate fixed mold piece is circumferentially arranged with multiple groups of detection grooves with crystal oscillators, heating coils and temperature sensors, the intermediate movable mold piece is provided with multiple groups of oil storage areas, and the work stations are switched through a rotary drive mechanism; the upper mold piece is loaded with a three-in-one-out valve, which respectively connects the oil inlet, air passage and hot air cleaning passage, and the lower mold piece is layered and provided with independent oil discharge and air discharge channels. The device can realize single sampling and multiple synchronous detection, eliminate temperature detection errors by matching a closed-loop constant temperature control, and simultaneously integrate automatic oil discharge and hot air self-cleaning functions, without manual intervention throughout the process. The device effectively avoids sampling errors and cavity residual interference, improves detection accuracy and data repeatability, and meets the continuous and high-precision online detection requirements of the insulating oil dehydration line.

Description

Technical Field

[0001] This invention belongs to the field of insulating oil production technology, specifically relating to a moisture detection device for dehydrated insulating oil wires. Background Technology

[0002] Insulating oil is the core medium in power equipment such as power transformers and high-voltage switches, playing crucial roles in insulation, heat dissipation, and arc suppression. Its moisture content is a key indicator of oil quality. Even trace amounts of residual moisture in insulating oil can significantly reduce its insulating strength, accelerate oxidation and aging, and promote the growth of acidic corrosive substances. This can then erode internal insulating components and metal parts, easily leading to partial discharge, breakdown, or even shutdown, seriously threatening the safe and stable operation of power equipment. Therefore, in the industrial dehydration process of insulating oil, precise and efficient moisture testing is necessary to strictly control the water content and ensure that the quality of the insulating oil leaving the factory meets standards.

[0003] Currently, insulating oil dehydration production lines are generally equipped with dedicated moisture detection devices for real-time sampling and monitoring of the dehydration effect of insulating oil, and to determine whether the oil meets production standards. However, existing detection devices still have significant technical shortcomings in actual industrial continuous production applications, making it difficult to meet the needs of large-scale, high-precision, and high-efficiency production testing.

[0004] Firstly, most existing moisture detection devices operate on a single sampling and testing model, failing to achieve simultaneous testing of multiple batches after a single sampling. In the scenario of batch production testing of insulating oil, workers need to repeatedly sample and test multiple times, which not only makes the operation process cumbersome, significantly increasing manual operation costs and testing time, but also greatly reduces the testing efficiency and production cycle of the entire dehydration production line. Furthermore, repeated sampling is prone to sampling errors. Slight deviations in the testing environment and parameters between different batches result in large data dispersion and poor repeatability, failing to accurately reflect the true moisture content of the entire batch of insulating oil. The accuracy and reliability of the test results are insufficient, making it difficult to meet the requirements of high-precision oil quality inspection.

[0005] Secondly, existing testing devices lack automated and rapid cleaning mechanisms. After each test, small amounts of insulating oil, trace amounts of moisture, and impurities easily remain inside the testing chamber. During continuous testing, these residues can severely interfere with subsequent tests, easily leading to inflated data and misjudgments. Manual cleaning of the testing chamber is not only inefficient and time-consuming, failing to meet the demands of continuous production line operations, but also suffers from incomplete cleaning and non-standard operating procedures, further exacerbating testing errors. Over the long term, this will continuously affect the overall testing accuracy and lifespan of the equipment, hindering the continuous and stable production of the insulating oil dehydration production line.

[0006] Therefore, it is necessary to optimize and improve the existing moisture detection device used for dehydration of insulating oil. Summary of the Invention

[0007] The purpose of this invention is to overcome the above-mentioned problems in the prior art and provide a moisture detection device for dehydration wires made of insulating oil.

[0008] To achieve the above-mentioned technical objectives and effects, the present invention is implemented through the following technical solution: This invention provides a moisture detection device for dehydrated insulating oil wires, comprising an upper mold, a middle fixed mold, a middle moving mold, and a lower mold; The upper mold, the middle fixed mold, and the lower mold are arranged in order from top to bottom. The fastening bolts pass through the outer edge connection structure of the four to achieve overall assembly and fixation. The middle movable mold is movably clamped between the upper mold and the lower mold and can rotate circumferentially relative to the middle fixed mold. The upper module is provided with a first annular cavity and a first axial guide hole communicating with the first annular cavity. The upper module is equipped with a three-in-one-out valve. The output end of the three-in-one-out valve is connected to the first annular cavity. The three input ends of the three-in-one-out valve are respectively connected to the output oil pipe of the insulating oil dehydration line, the dustproof vent cap, and the hot air blower. The inner ring of the intermediate fixed mold is provided with several detection grooves along the circumference. Each detection groove is equipped with a crystal oscillator for detecting moisture in the insulating oil and a heating coil for constant temperature control. A temperature sensor is correspondingly assembled inside the detection groove. The surface of the crystal oscillator electrode is coated with a polymer hydrophilic adsorption film to selectively adsorb moisture inside the insulating oil and generate a frequency shift signal. The outer edge of the intermediate moving module is uniformly provided with several oil storage areas along the circumference. The intermediate moving module is equipped with a rotary drive mechanism, which can drive the intermediate moving module to rotate circumferentially, so as to realize the alignment and switching of the oil storage area with the detection groove and the different flow channels of the lower module. The lower mold has a second annular cavity and a third annular cavity arranged in layers inside. The lower mold has a second axial flow guide hole that connects to the second annular cavity and an axial flow guide pipe that connects to the third annular cavity. The second axial flow guide hole and the axial flow guide pipe are misaligned. The lower mold is also equipped with an oil drain pipe that connects to the second annular cavity and an exhaust pipe that connects to the third annular cavity.

[0009] Furthermore, it also includes a controller, which is electrically connected to a three-inlet-one-outlet valve, a rotary drive mechanism, a heating coil, a temperature sensor, and a crystal oscillator; The temperature sensor collects the ambient temperature inside the detection groove in real time. The controller adjusts the heating coil power in a closed loop according to the temperature feedback signal to keep the detection environment constant at the national standard test temperature of 20℃ or 40℃, thus eliminating the detection error caused by temperature drift. The controller has a built-in moisture content-frequency offset calibration curve algorithm program, which can collect crystal oscillator frequency offset signals and temperature sensor temperature signals, automatically complete the moisture conversion of insulating oil, and at the same time work with the control device to complete the fully automated operation of sampling detection, oil drainage and hot air self-cleaning.

[0010] Furthermore, the upper module includes an upper module, with multiple first fastening blocks arranged circumferentially around the outer edge of the upper module, a first annular cavity opened inside the upper module, and first axial guide holes evenly arranged circumferentially along the lower side of the upper module and axially connected to the first annular cavity; the three-inlet-one-outlet valve is fixedly installed on the top of the upper module, and its output branch extends vertically into the interior of the upper module and seals and connects to the first annular cavity; the lower side of the upper module is respectively provided with a first outer sealing groove and a first inner sealing groove, the first outer sealing groove being located around the first annular cavity, and the first inner sealing groove being located inside the first annular cavity.

[0011] Furthermore, the intermediate fixed module includes an intermediate fixed module, and a second fastening block is arranged on the outer edge of the intermediate fixed module to align and cooperate with the first fastening block. External sealing rings are symmetrically installed on the upper and lower end faces of the intermediate fixed module. The upper external sealing ring is embedded in the first external sealing groove and the first internal sealing groove to achieve double-layer sealing between the end faces of the upper module and the intermediate fixed module.

[0012] Furthermore, the intermediate moving module includes an intermediate moving module, with inner sealing rings symmetrically installed on both the upper and lower end faces of the intermediate moving module. The inner sealing rings respectively fit against the lower end face of the upper module and the upper end face of the lower module, achieving dynamic rotational sealing of the upper and lower end faces of the intermediate moving module. An arc-shaped rack is provided on the upper part of the inner wall of the intermediate moving module. The rotation drive mechanism includes a support plate, a drive motor, and a drive gear. The support plate fixes and supports the drive motor, and the output end of the drive motor is connected to the drive gear. The drive gear meshes with the arc-shaped rack to drive the intermediate moving module to rotate precisely in the circumferential direction.

[0013] Furthermore, the lower module includes a lower module, and a third fastening block is arranged on the outer edge of the lower module to align and cooperate with the first fastening block and the second fastening block. Fastening bolts pass through the first fastening block, the second fastening block and the third fastening block in sequence to achieve axial locking and fixation of the three. The upper end face of the lower module is respectively provided with a second outer sealing groove and a second inner sealing groove. The outer sealing ring below the intermediate fixed module is correspondingly embedded in the second outer sealing groove and the second inner sealing groove to achieve double-layer sealing of the end faces of the intermediate fixed module and the lower module.

[0014] Furthermore, the second axial guide holes are evenly distributed circumferentially along the upper end face of the lower module and are axially connected to the second annular cavity. The axial guide hole tube is vertically inserted into the lower module and its upper end is flush with the upper end face of the lower module, while its lower end is connected to the third annular cavity.

[0015] Furthermore, the included angle between the centers of adjacent second axial guide holes and axial guide hole pipes is greater than the included angle between the centers of a single oil storage area, ensuring that the oil storage area can only connect to one set of flow channels in a single rotation, thus avoiding interference between the oil discharge and hot air cleaning flow channels.

[0016] Furthermore, the oil drain pipe is clamped and fixed to the lower side of the lower module and sealed to the second annular cavity, and the oil drain pipe is connected to an oil storage tank with a suction pump; the exhaust pipe is clamped and fixed to the lower side of the lower module and sealed to the third annular cavity, and the exhaust pipe is connected to an exhaust gas absorption cylinder.

[0017] Furthermore, the device operates in three states: a detection station, an oil draining station, and a self-cleaning station. At the detection station, the oil storage area and the detection groove are aligned to complete the sampling of insulating oil, constant temperature detection, and moisture calculation. At the oil draining station, the oil storage area is simultaneously connected to the detection groove and the second axial guide hole to complete the automatic discharge of waste oil. At the self-cleaning station, the oil storage area is simultaneously connected to the detection groove and the axial guide hole pipe, and hot air is introduced into the oil storage area and the crystal oscillator surface to complete the automatic desorption and cleaning of residues and residual moisture.

[0018] The beneficial effects of this invention are: 1. This device features multiple oil storage zones arranged circumferentially in the intermediate moving module, coupled with multiple detection grooves and crystal oscillator detection units matched circumferentially in the intermediate fixed module. This allows for the simultaneous parallel detection of multiple oil samples with a single introduction of insulating oil sample. Furthermore, the entire process involves only one sampling and feeding, avoiding deviations in oil sample composition and environmental interference caused by repeated sampling. This eliminates sampling system errors at the source, significantly reducing the dispersion of detection data and improving the repeatability and consistency of detection data for the same batch of oil.

[0019] 2. The device incorporates a built-in temperature sensor and heating coil to form a closed-loop temperature control system, precisely maintaining the internal temperature of the detection chamber at the national standard test temperature of 20℃ or 40℃. This avoids temperature drift caused by fluctuations in ambient temperature and heat generated during equipment operation, eliminating interference from temperature variables on moisture detection results. Simultaneously, a crystal oscillator coated with a hydrophilic polymer adsorption film is used as the detection element. This selectively adsorbs trace amounts of moisture from the insulating oil, unaffected by impurities in the oil itself or the composition of the insulating oil matrix. By accurately acquiring the crystal oscillator frequency offset signal and calculating the moisture content, combined with a dedicated calibration curve algorithm built into the controller, accurate detection of trace moisture at the ppm level is achieved.

[0020] 3. This device innovatively integrates three automatic switching stations: detection, oil drainage, and self-cleaning. Utilizing a rotary drive mechanism, it precisely rotates and aligns the intermediate moving module. After detection, it automatically switches to the oil drainage station to empty the waste oil, then switches to the self-cleaning station. A hot air blower is connected via a three-inlet, one-outlet valve, introducing high-temperature, dry hot air into the oil storage area and crystal oscillator testing surface to quickly remove residual insulating oil, trace amounts of moisture, and solid impurities. The entire process requires no manual disassembly or cleaning; the self-cleaning process is fully automated, making it suitable for continuous, uninterrupted production lines for insulating oil dehydration.

[0021] Of course, any product implementing this invention does not necessarily need to achieve all of the above advantages at the same time. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a front view schematic diagram of the entire invention; Figure 3 This is a schematic diagram of the upper module at one angle in this invention; Figure 4 This is a half-sectional schematic diagram of the upper module in this invention; Figure 5 This is a schematic diagram of the upper module from another angle in this invention; Figure 6 This is an assembly diagram of the intermediate fixed module and the intermediate moving module of the present invention; Figure 7 This is a schematic diagram of the intermediate fixed module of the present invention; Figure 8 This is a schematic diagram of the structure of the intermediate moving module of the present invention; Figure 9 This is a structural schematic diagram of the lower module at one angle in this invention; Figure 10 This is a half-sectional schematic diagram of the lower module in this invention; Figure 11 This is a schematic diagram of the lower module from another angle in this invention; In the attached diagram, the components represented by each number are as follows: 1-Upper module, 101-Upper module, 102-First fastening block, 103-First annular cavity, 104-Three-inlet-one-outlet valve, 105-First axial guide hole, 106-First outer sealing groove, 107-First inner sealing groove; 2-Intermediate fixed module, 201-Intermediate fixed module, 202-Second fastening block, 203-Outer sealing ring, 204-Detection groove, 205-Crystal oscillator, 206-Heating coil; 3-Intermediate moving module, 301-Intermediate moving module, 302-Inner sealing ring, 303-Oil storage area, 304-Arc rack, 305-Panel, 306-Drive motor, 307-Drive gear; 4-Lower module, 401-Lower module, 402-Third fastening block, 403-Second annular cavity, 404-Third annular cavity, 405-Second axial guide hole, 406-Oil drain pipe, 407-Axial guide hole pipe, 408-Exhaust pipe, 409-Second outer sealing groove, 410-Second inner sealing groove; 5-Fastening bolts. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] like Figures 1-2As shown, this embodiment provides a moisture detection device for insulating oil dehydration lines, including an upper mold 1, a middle fixed mold 2, a middle movable mold 3, and a lower mold 4; the upper mold 1, the middle fixed mold 2, and the lower mold 4 are arranged sequentially from top to bottom, and fastening bolts 5 pass through the outer edge connection structure of the four to achieve overall assembly and fixation; the middle movable mold 3 is movably clamped between the upper mold 1 and the lower mold 4 and can rotate circumferentially relative to the middle fixed mold 2; the upper mold 1 has a first annular cavity 103 inside and a... The first annular cavity 103 is connected to the first axial guide hole 105. The upper mold 1 is equipped with a three-inlet-one-outlet valve 104. The output end of the three-inlet-one-outlet valve 104 is connected to the first annular cavity 103. The three input ends of the three-inlet-one-outlet valve 104 are respectively connected to the output oil pipe of the insulating oil dehydration line, the dustproof vent cap, and the hot air blower. The inner ring of the middle fixed mold 2 is provided with several detection grooves 204 along the circumference. Each detection groove 204 is equipped with a crystal oscillator 205 for detecting the moisture content of the insulating oil and a constant temperature control device. A heating coil 206 is installed in the temperature field, and a temperature sensor is installed inside the detection groove 204. The surface of the crystal oscillator 205 electrode is coated with a hydrophilic polymer adsorption film to selectively adsorb moisture inside the insulating oil and generate a frequency shift signal. Several oil storage areas 303 are evenly opened around the outer edge of the intermediate moving module 3. The intermediate moving module 3 is equipped with a rotary drive mechanism, which can drive the intermediate moving module 3 to rotate circumferentially, realizing the alignment and switching of the oil storage area 303 with the detection groove 204 and the lower module 4. The lower module 4 is internally arranged with a second annular cavity 403 and a third annular cavity 404. The lower module 4 is respectively opened with a second axial guide hole 405 connecting the second annular cavity 403 and an axial guide hole pipe 407 connecting the third annular cavity 404. The positions of the second axial guide hole 405 and the axial guide hole pipe 407 are staggered. The lower module 4 is also equipped with an oil drain pipe 406 connecting the second annular cavity 403 and an exhaust pipe 408 connecting the third annular cavity 404.

[0026] This device also includes a controller, which is electrically connected to a three-inlet-one-outlet valve 104, a rotary drive mechanism, a heating coil 206, a temperature sensor, and a crystal oscillator 205. The temperature sensor collects the ambient temperature inside the detection groove 204 in real time. The controller adjusts the power of the heating coil 206 in a closed loop according to the temperature feedback signal to keep the detection environment constant at the national standard test temperature of 20℃ or 40℃, eliminating detection errors caused by temperature drift. The controller has a built-in moisture content-frequency offset calibration curve algorithm program, which can collect the frequency offset signal of the crystal oscillator 205 and the temperature signal of the temperature sensor, automatically complete the conversion of moisture content in the insulating oil, and at the same time work with the control device to complete the fully automated operation of sampling and testing, oil drainage, and hot air self-cleaning.

[0027] like Figures 3-5As shown, the upper module 1 includes an upper module 101. Multiple first fastening blocks 102 are arranged circumferentially on the outer edge of the upper module 101. A first annular cavity 103 is opened inside the upper module 101. First axial guide holes 105 are evenly arranged circumferentially along the lower side of the upper module 101 and axially penetrate and connect to the first annular cavity 103. A three-inlet-one-outlet valve 104 is fixedly installed on the top of the upper module 101. Its output branch extends vertically into the interior of the upper module 101 and seals and connects to the first annular cavity 103. A first outer sealing groove 106 and a first inner sealing groove 107 are respectively opened on the lower side of the upper module 101. The first outer sealing groove 106 is located outside the first annular cavity 103, and the first inner sealing groove 107 is located inside the first annular cavity 103.

[0028] like Figures 6-7 As shown, the intermediate fixed module 2 includes an intermediate fixed module 201. A second fastening block 202 is arranged on the outer edge of the intermediate fixed module 201 to align with the first fastening block 102. External sealing rings 203 are symmetrically installed on the upper and lower end faces of the intermediate fixed module 201. The upper external sealing ring 203 is embedded in the first external sealing groove 106 to achieve sealing between the end faces of the upper module 1 and the intermediate fixed module 2.

[0029] like Figure 8 As shown, the intermediate moving module 3 includes an intermediate moving module 301. Inner sealing rings 302 are symmetrically installed on the upper and lower end faces of the intermediate moving module 301. The two inner sealing rings 302 respectively fit the first inner sealing groove 107 at the lower end of the upper module 1 and the second inner sealing groove 410 at the upper end of the lower module 4, realizing dynamic rotational sealing of the upper and lower end faces of the intermediate moving module 3. An arc-shaped rack 304 is provided on the upper part of the inner wall of the intermediate moving module 301. The rotation drive mechanism includes a support plate 305, a drive motor 306 and a drive gear 307. The support plate 305 fixes and supports the drive motor 306. The output end of the drive motor 306 is connected to the drive gear 307. The drive gear 307 meshes with the arc-shaped rack 304 to drive the intermediate moving module 301 to rotate precisely in the circumference.

[0030] like Figures 9-11 As shown, the lower module 4 includes a lower module 401. A third fastening block 402 is arranged on the outer edge of the lower module 401 to align with the first fastening block 102 and the second fastening block 202. Fastening bolts 5 pass through the first fastening block 102, the second fastening block 202 and the third fastening block 402 in sequence to achieve axial locking and fixation of the three. The upper end face of the lower module 401 is respectively provided with a second outer sealing groove 409 and a second inner sealing groove 410. The outer sealing ring 203 below the middle fixed module 201 is correspondingly embedded in the second outer sealing groove 409 to achieve sealing between the end face of the middle fixed module 2 and the lower module 4.

[0031] In this embodiment, the second axial guide hole 405 is evenly distributed circumferentially along the upper end face of the lower module 401 and is axially connected to the second annular cavity 403. The axial guide hole tube 407 is vertically inserted into the lower module 401, with its upper end flush with the upper end face of the lower module 401 and its lower end connected to the third annular cavity 404.

[0032] In this embodiment, the included angle between the centers of adjacent second axial guide holes 405 and axial guide hole pipes 407 is greater than the included angle between the centers of a single oil storage area 303, ensuring that the oil storage area 303 can only connect to one set of flow channels in a single rotation, thus avoiding interference between the oil discharge and hot air cleaning flow channels.

[0033] In this embodiment, the oil drain pipe 406 is snapped and fixed to the lower side of the lower module 401 and sealed to the second annular cavity 403. The oil drain pipe 406 is externally connected to an oil storage tank with a suction pump. The exhaust pipe 408 is snapped and fixed to the lower side of the lower module 401 and sealed to the third annular cavity 404. The exhaust pipe 408 is externally connected to an exhaust gas absorption cylinder.

[0034] In this embodiment, the device operates in three states: a detection station, an oil draining station, and a self-cleaning station. At the detection station, the oil storage area 303 and the detection groove 204 are directly aligned to complete the sampling of insulating oil, constant temperature detection, and moisture calculation. At the oil draining station, the oil storage area 303 is simultaneously connected to the detection groove 204 and the second axial guide hole 405 to complete the automatic discharge of waste oil. At the self-cleaning station, the oil storage area 303 is simultaneously connected to the detection groove 204 and the axial guide hole pipe 407, and hot air is introduced into the oil storage area 303 and the surface of the crystal oscillator 205 to complete the automatic desorption and cleaning of residues and residual moisture.

[0035] A specific application of this embodiment is as follows: The basic operating parameters of the device are set as follows: the controller controls the heating coil 206 in a closed loop, and the constant detection chamber temperature is 20℃ as specified by the national standard; 6 sets of oil storage areas 303 are evenly arranged in the circumference of the intermediate moving module 3, and the included angle between the centers of adjacent oil storage areas 303 is 60°; the hot air temperature is 60℃, the hot air introduction time is 30s, and the hot air pressure is 0.08MPa.

[0036] After the device is powered on, the controller performs a self-test, the drive motor 306 is reset, the six oil storage areas 303 of the intermediate moving module 3 and the six detection grooves 204 of the intermediate fixed module 2 are aligned one by one, and the device is in the detection standby state; the temperature sensor monitors the temperature inside the cavity in real time, the heating coil 206 starts preheating, stabilizes the cavity temperature to 20℃ and maintains a constant temperature.

[0037] The controller controls the three-in-one-out valve 104 to switch the passage and connect the output oil pipe of the insulating oil dehydration line. After dehydration, the finished insulating oil passes through the first annular cavity 103 and the first axial guide hole 105 in sequence and flows into the six oil storage areas 303 simultaneously. The oil sample is in full contact with the hydrophilic adsorption film on the surface of the crystal oscillator 205 in the detection groove 204. The crystal oscillator 205 adsorbs trace amounts of water in the oil sample and generates a frequency offset signal. The controller collects the frequency signal and the real-time temperature signal, and through the built-in water content-frequency offset calibration curve algorithm, it simultaneously completes the automatic calculation of the water content of the six oil samples, data recording and real-time uploading.

[0038] After the test is completed, the controller starts the drive motor 306, which drives the drive gear 307 to mesh with the arc rack 304, driving the intermediate moving module 3 to rotate clockwise by a certain angle. The oil storage area 303 is simultaneously connected to the second axial guide hole 405 and the second annular cavity 403. Then, the external suction pump connected to the oil drain pipe 406 is started. The waste insulating oil that has been tested in the oil storage area 303 is quickly discharged into the external oil storage tank through the second axial guide hole 405 and the second annular cavity 403. The oil discharge time is 20 seconds, realizing fully automatic recycling of waste oil.

[0039] Hot air self-cleaning station operation: After the oil is drained, the drive motor 306 continues to drive the intermediate moving module 3 to rotate counterclockwise by a certain angle. The oil storage area 303 connects with the axial guide flow pipe 407 and the third annular cavity 404. The controller switches the three-inlet-one-outlet valve 104 passage, closes the oil inlet passage, and connects the hot air blower passage. Dry hot air is introduced into the oil storage area 303 and the crystal oscillator 205 detection surface through the axial guide flow pipe 407. The hot air blows continuously for 30 seconds to thoroughly remove the residual oil film, trace residual moisture and small impurities on the surface of the crystal oscillator 205. The exhaust gas generated by the blow-off enters the exhaust gas absorption cylinder through the third annular cavity 404 and the exhaust pipe 408 for unified harmless treatment.

[0040] After the self-cleaning process is completed, the moving module rotates back to the initial testing station, waiting for the next batch of insulating oil testing, thus completing one full automated testing cycle.

[0041] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A moisture detection device for dehydrated insulating oil wires, characterized in that, It includes the upper mold, the intermediate fixed mold, the intermediate moving mold, and the lower mold; The upper mold, the middle fixed mold, and the lower mold are arranged in order from top to bottom. The fastening bolts pass through the outer edge connection structure of the four to achieve overall assembly and fixation. The middle movable mold is movably clamped between the upper mold and the lower mold and can rotate circumferentially relative to the middle fixed mold. The upper module is provided with a first annular cavity and a first axial guide hole communicating with the first annular cavity. The upper module is equipped with a three-in-one-out valve. The output end of the three-in-one-out valve is connected to the first annular cavity. The three input ends of the three-in-one-out valve are respectively connected to the output oil pipe of the insulating oil dehydration line, the dustproof vent cap, and the hot air blower. The inner ring of the intermediate fixed mold is provided with several detection grooves along the circumference. Each detection groove is equipped with a crystal oscillator for detecting moisture in the insulating oil and a heating coil for constant temperature control. A temperature sensor is correspondingly assembled inside the detection groove. The surface of the crystal oscillator electrode is coated with a polymer hydrophilic adsorption film to selectively adsorb moisture inside the insulating oil and generate a frequency shift signal. The outer edge of the intermediate moving module is uniformly provided with several oil storage areas along the circumference. The intermediate moving module is equipped with a rotary drive mechanism, which can drive the intermediate moving module to rotate circumferentially, so as to realize the alignment and switching of the oil storage area with the detection groove and the different flow channels of the lower module. The lower mold has a second annular cavity and a third annular cavity arranged in layers inside. The lower mold has a second axial flow guide hole that connects to the second annular cavity and an axial flow guide pipe that connects to the third annular cavity. The second axial flow guide hole and the axial flow guide pipe are misaligned. The lower mold is also equipped with an oil drain pipe that connects to the second annular cavity and an exhaust pipe that connects to the third annular cavity.

2. The moisture detection device for insulating oil dehydration wire according to claim 1, characterized in that, It also includes a controller, which is electrically connected to a three-inlet-one-outlet valve, a rotary drive mechanism, a heating coil, a temperature sensor, and a crystal oscillator.

3. The moisture detection device for insulating oil dehydration wire according to claim 2, characterized in that, The upper module includes an upper module with multiple first fastening blocks arranged circumferentially around its outer edge. A first annular cavity is opened inside the upper module. First axial guide holes are evenly arranged circumferentially along the lower side of the upper module and axially connect to the first annular cavity. The three-inlet-one-outlet valve is fixedly installed on the top of the upper module, and its output branch extends vertically into the upper module and seals and connects to the first annular cavity. A first outer sealing groove and a first inner sealing groove are respectively opened on the lower side of the upper module. The first outer sealing groove is located outside the first annular cavity, and the first inner sealing groove is located inside the first annular cavity.

4. A moisture detection device for insulating oil dehydration wire according to claim 3, characterized in that, The intermediate fixed module includes an intermediate fixed module, and a second fastening block is arranged on the outer edge of the intermediate fixed module to align and cooperate with the first fastening block. External sealing rings are symmetrically installed on the upper and lower end faces of the intermediate fixed module. The upper external sealing ring is embedded in the first external sealing groove to achieve sealing between the end faces of the upper module and the intermediate fixed module.

5. A moisture detection device for insulating oil dehydration wire according to claim 4, characterized in that, The intermediate moving module includes an intermediate moving module, with inner sealing rings symmetrically installed on both the upper and lower end faces of the intermediate moving module. The inner sealing rings respectively fit against the lower end face of the upper module and the upper end face of the lower module, realizing dynamic rotational sealing of the upper and lower end faces of the intermediate moving module. An arc-shaped rack is provided on the upper part of the inner wall of the intermediate moving module. The rotation drive mechanism includes a support plate, a drive motor, and a drive gear. The support plate fixes and supports the drive motor. The output end of the drive motor is connected to the drive gear. The drive gear meshes with the arc-shaped rack for transmission.

6. A moisture detection device for insulating oil dehydration wire according to claim 5, characterized in that, The lower module includes a lower module, and a third fastening block is arranged on the outer edge of the lower module to align with the first fastening block and the second fastening block. Fastening bolts pass through the first fastening block, the second fastening block and the third fastening block in sequence to achieve axial locking and fixation of the three. The upper end face of the lower module is respectively provided with a second outer sealing groove and a second inner sealing groove. The outer sealing ring below the intermediate fixed module is correspondingly embedded in the second outer sealing groove to achieve sealing between the end face of the intermediate fixed module and the lower module.

7. A moisture detection device for insulating oil dehydration wire according to claim 6, characterized in that, The second axial guide hole is evenly distributed circumferentially along the upper end face of the lower module and is axially connected to the second annular cavity. The axial guide hole tube is vertically inserted into the lower module and its upper end is flush with the upper end face of the lower module, while its lower end is connected to the third annular cavity.

8. A moisture detection device for insulating oil dehydration wire according to claim 7, characterized in that, The included angle between the centers of adjacent second axial guide holes and axial guide hole pipes is greater than the included angle between the centers of a single oil storage area.

9. A moisture detection device for insulating oil dehydration wire according to claim 8, characterized in that, The oil drain pipe is clamped and fixed to the lower side of the lower module and sealed to the second annular cavity. The oil drain pipe is connected to an oil storage tank with a suction pump. The exhaust pipe is clamped and fixed to the lower side of the lower module and sealed to the third annular cavity. The exhaust pipe is connected to an exhaust gas absorption cylinder.

10. A moisture detection device for an insulating oil dehydration wire according to claim 9, characterized in that, The device operates in three states: a testing station, an oil draining station, and a self-cleaning station. At the testing station, the oil storage area and the testing groove are aligned to complete the sampling of insulating oil, constant temperature testing, and moisture calculation. At the oil draining station, the oil storage area is simultaneously connected to the testing groove and the second axial guide hole to complete the automatic discharge of waste oil. At the self-cleaning station, the oil storage area is simultaneously connected to the testing groove and the axial guide hole pipe, and hot air is introduced into the oil storage area and the crystal oscillator surface to complete the automatic desorption and cleaning of residues and residual moisture.

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