Miniature laboratory insulating oil recovery device and method

Abstract

The invention discloses a laboratory insulating oil miniature recovery device and method, and relates to the technical field of electrical equipment insulating oil recovery, the laboratory insulating oil miniature recovery device comprises a box body and a box cover, a control panel is arranged at an opening of the box body, an oil inlet is formed in the control panel, and an oil inlet pipe penetrates through the control panel to be connected to a primary filter; the oil outlet end of the primary filter is connected with a heating module through a primary filter oil pipe; the oil outlet end of the heating module is connected to a rotator in the oil-gas separator through a heating oil pipe; the bottom of the oil-gas separator is connected with an oil drain pump through an oil drain pipe, and the top of the oil-gas separator is connected with a condenser through an exhaust pipe. Through organic combination of heating, vacuum degassing and small-range closed-loop circulation, hydrogen, acetylene, air and moisture in oil are synchronously removed under the low-temperature heating condition, chemical additives and frequent replacement of consumables are not needed, and the device has the advantages of being compact in structure, easy and convenient to operate, good in regeneration effect, low in operation cost, environmentally friendly and free of pollution.

Description

Technical Field

[0001] This invention belongs to the field of electrical equipment insulating oil recycling technology, and particularly relates to a laboratory insulating oil micro-recycling device and method. Background Technology

[0002] In the testing and analysis of insulating oil for power equipment, multiple tests are usually required, including simplified experiments and oil chromatography analysis, which generate a large amount of waste oil. This waste oil often contains dissolved gases (such as hydrogen, acetylene, and air), trace amounts of moisture, and solid particulate impurities, resulting in a decrease in breakdown voltage and an increase in dielectric loss, making it unusable as experimental oil or blank oil for reuse.

[0003] Currently, the regeneration of insulating oil mainly relies on large-scale oil filtration equipment. This equipment typically employs a combination of high-temperature heating (above 90℃), vacuum degassing, and filtration, suitable for on-site maintenance of large power equipment such as main transformers. However, directly applying it to laboratory settings has the following shortcomings:

[0004] 1. Large size and mismatched processing capacity: Large oil filtration equipment typically processes tens to hundreds of liters at a time, while laboratory waste oil is mostly hundreds of milliliters to several liters, resulting in energy waste and inconvenience in operation, making it difficult to achieve efficient recovery of trace oil samples in the laboratory.

[0005] 2. High-temperature treatment can easily lead to oil aging: Large equipment often uses high-temperature heating to improve degassing efficiency, but laboratory oil samples are small in quantity and have low heat capacity. High temperature can easily cause oil oxidation and volatilization of light components, which will reduce the quality of the oil and fail to meet the requirements of experimental oil for oil stability.

[0006] 3. Reliance on chemical regeneration or frequent replacement of consumables: Some existing technologies use clay, activated carbon or chemical additives for adsorption and regeneration, which poses a risk of secondary pollution. In addition, the frequent replacement of consumables increases the cost of use and maintenance burden, which is not in line with the green and environmentally friendly development direction of laboratories.

[0007] 4. Limited functionality and poor compatibility: Existing miniaturized devices mostly only have dehydration or filtration functions, making it difficult to simultaneously process simplified experimental waste oil and chromatographic experimental waste oil. They cannot effectively remove dissolved gases (such as hydrogen and acetylene) and trace amounts of moisture, and cannot achieve comprehensive regeneration and reuse of waste oil.

[0008] Therefore, there is an urgent need in this field for a micro-recycling device for insulating oil specifically designed for laboratory settings. This device can achieve integrated processing of low-temperature heating, dynamic vacuum degassing, and physical regeneration within a small volume, without the need for chemical additives or frequent replacement of consumables, thus meeting the practical needs of efficient, environmentally friendly, and low-cost recycling of laboratory waste oil. Summary of the Invention

[0009] The technical problem this invention aims to solve is to overcome the shortcomings of existing technologies by designing a micro-recycling device for laboratory insulating oil. This device integrates a heating module, a rotator, and an oil-gas separator into a sealed chamber of 500mL–2L. It utilizes a PTC constant-temperature heating rod to achieve low-temperature heating of 40–60℃, non-powered lateral tangential eccentric vortex atomization, and dynamic vacuum degassing through a vacuum pump and condenser. During physical regeneration, hydrogen, acetylene, air, and moisture are simultaneously removed from the oil. The device employs a transparent flexible tube for visualized monitoring of the oil path. The control panel integrates one-button start, calibration, vacuum pump emergency stop buttons, data communication, and terminal setting interfaces. A primary filter intercepts solid impurities, eliminating the need for chemical additives and frequent consumable replacements. This compact structure enables efficient, low-temperature, and low-cost recycling of trace amounts of laboratory insulating waste oil, solving the technical problems of existing large-scale oil filtration equipment such as mismatched processing capacity, high-temperature heating leading to oil aging, reliance on chemical additives and frequent consumable replacements, and limited functionality incompatible with multiple types of waste oil.

[0010] The solution adopted by this invention to solve its technical problem is as follows:

[0011] A miniature laboratory insulating oil recovery device.

[0012] Includes a box body and lid connected by hinges.

[0013] The opening of the housing is provided with a control panel, the control panel is provided with an oil inlet, the oil inlet is provided with an oil inlet pipe, and the oil inlet pipe extends through the control panel to the pre-filter inside the housing.

[0014] The primary filter is located between the bottom of the housing and the control panel. It is equipped with a 1-3μm glass fiber pleated filter element. The oil outlet of the primary filter is connected to a heating module through a primary filter oil pipe.

[0015] The oil outlet of the heating module is connected to the interior of the oil-gas separator via a heating oil pipe. The interior of the oil-gas separator is equipped with a rotator, and the oil outlet of the heating module is connected to the oil inlet of the rotator via the heating oil pipe.

[0016] The bottom of the oil-gas separator is provided with an oil drain port for connecting an oil drain pipe, and the oil drain pipe is connected to an oil drain pump; the top of the side wall of the oil-gas separator is provided with an exhaust port for connecting an exhaust pipe, and the exhaust pipe is connected to a condenser.

[0017] The condenser's exhaust port is connected to a vacuum pump, and the condenser's liquid outlet is connected to a drain pipe.

[0018] The oil-gas separator and the rotary valve are integrated into the same sealed cavity, with a cavity volume of 500mL to 2L.

[0019] As a preferred embodiment of the present invention

[0020] The control panel is provided with a display slot. The top cover of the heating module and the top cover of the oil-gas separator are fixed in the display slot. The side of the display slot is provided with a primary filter hole, a heating hole, an exhaust hole and an oil drain port, which are used to pass through and fix the primary filter oil pipe, the heating oil pipe, the exhaust pipe and the oil drain pipe respectively.

[0021] The primary filter pipe, heating pipe, oil drain pipe, and drain pipe are all transparent flexible tubes.

[0022] The control panel is equipped with a temperature gauge and a vacuum gauge. The temperature sensor of the temperature gauge extends into the heating module, and the vacuum gauge is connected to the inside of the oil-gas separator through a pipeline.

[0023] As a preferred embodiment of the present invention

[0024] The control panel is equipped with a one-key start button, a calibration button, and a degassing power button.

[0025] The one-button start is used to start the insulating oil recycling process. After being pressed, it automatically performs the primary filtration, heating cycle, vacuum degassing and automatic shutdown procedures.

[0026] The calibration button is used to calibrate the vacuum sensor and the temperature sensor.

[0027] The degassing power button is used to control the emergency power-off of the vacuum pump.

[0028] As a preferred embodiment of the present invention

[0029] The control panel is also equipped with a power interface, a power button, a communication button, and a settings interface;

[0030] The power interface is used to connect to an external power source, and the power button is used to control the overall start and stop of the device.

[0031] The communication button is used to send the data detected by the temperature sensor and vacuum sensor to the terminal for display.

[0032] The configuration interface is used to connect to an external terminal to configure parameters for the insulating oil recycling process.

[0033] As a preferred embodiment of the present invention

[0034] The heating module includes a mounting frame that is bolted to the housing. The mounting frame has a mounting cavity, in which a heating rod is installed. The heating oil pipe is connected to the mounting frame via a clamping flange and a sealing ring.

[0035] As a preferred embodiment of the present invention

[0036] The heating rod is a fully enclosed immersion stainless steel PTC constant temperature heating rod, which achieves low-temperature heating of 40-60℃ through the self-limiting temperature characteristics of PTC ceramic.

[0037] As a preferred embodiment of the present invention

[0038] The cooling medium of the condenser is circulating water or air cooling, and its liquid outlet is connected to a drain pipe.

[0039] As a preferred embodiment of the present invention

[0040] The rotator adopts a lateral tangential eccentric oil inlet guide cavity structure, and its inlet direction is eccentrically set with respect to the cavity axis.

[0041] A micro-recovery method for laboratory insulating oil includes the following steps:

[0042] Step S1: Oil inlet and initial filtration,

[0043] The waste oil to be recycled enters the primary filter through the oil inlet pipe. After removing impurities, it enters the heating module for preheating and viscosity reduction.

[0044] Step S2: Heating and circulation,

[0045] The heating module heats the oil to 40-60°C and maintains a constant temperature. The heated insulating oil is then fed into the rotary valve.

[0046] Step S3: Cyclone atomization and gas-liquid separation,

[0047] Insulating oil enters the rotator and forms a swirling flow, dispersing into a semi-mist-like thin layer. Under the continuous suction of the vacuum pump, the oil-gas separator maintains a slightly negative pressure state, and the dissolved gas and water in the oil escape rapidly. The water vapor is cooled and liquefied by the condenser and then discharged, while the gas is extracted by the vacuum pump.

[0048] Step S4: Oil discharge. The treated oil collects at the bottom of the oil-gas separator under gravity and is discharged by the oil discharge pump through the oil discharge pipe.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] This invention innovatively applies the field technology of hot oil circulation degassing and regeneration for faulty main transformer oil in power systems to the recovery of trace insulating oil samples in the laboratory, realizing the miniaturization and specialization of industrial technology for laboratory scenarios. By organically combining heating, vacuum degassing, and small-scale closed-loop circulation, hydrogen, acetylene, air, and moisture are simultaneously removed from the oil at a low temperature of 40–60℃, restoring the breakdown voltage and dielectric loss indicators. This allows the waste oil to meet the standards for experimental or blank oil use again, solving the problem of waste oil that cannot be directly reused after experiments. It has the following beneficial effects:

[0051] 1. Miniaturized integrated design, precisely adapted to laboratory scenarios: This invention integrates the heating module, rotator and oil-gas separator into a closed cavity with a volume of 500mL to 2L. The single processing capacity is precisely matched to the actual use needs of laboratory micro-oil samples, fundamentally solving the pain points of energy waste and cumbersome operation caused by the excessive processing capacity of large oil filtration equipment, and adapting to the core needs of laboratory space and micro-processing.

[0052] 2. Low-temperature physical regeneration process effectively protects oil quality: This invention uses a fully enclosed immersion PTC constant temperature heating rod, which utilizes the self-limiting temperature characteristics of ceramics to achieve low-temperature heating of 40-60℃, avoiding the problems of oil oxidation and aging, volatilization of light components caused by traditional high-temperature (above 90℃) treatment methods, ensuring that the regenerated oil meets the standards for experimental oil and guaranteeing the accuracy of experimental data.

[0053] 3. Environmentally friendly design without consumables, reducing operating costs: The device of this invention adopts a pure physical regeneration process, combining heating, vacuum and circulation technologies. It does not require filter cartridges, clay or chemical additives, and saves the related costs of replacing consumables. It perfectly meets the dual core requirements of green environmental protection and low-cost operation in the laboratory.

[0054] 4. Highly efficient degassing and dehydration, compatible with multiple types of waste oil: The rotary device in this invention adopts a lateral tangential eccentric swirling atomization structure, dispersing the oil into a semi-mist-like thin layer under no-power conditions. Combined with dynamic vacuum degassing technology, it can simultaneously and efficiently remove hydrogen, acetylene, air, and moisture from the oil, with stable removal effects. Furthermore, this invention's device simplifies the regeneration needs of both experimental waste oil and chromatographic waste oil, enabling cross-experimental type recycling and broadening its applicability.

[0055] 5. Intelligent full-process control, simple and reliable operation: The control panel of this invention integrates a one-button start button, which can realize the full-process automatic operation of primary filtration, heating circulation, vacuum degassing and automatic shutdown, greatly reducing the difficulty of operation for operators; it also integrates a calibration button, which can periodically calibrate the temperature and vacuum sensors to ensure the measurement accuracy of the temperature and vacuum sensors; the pipelines for transporting oil are all made of transparent flexible tubing, which allows operators to intuitively observe the oil flow status, color changes and bubble conditions, and realize real-time monitoring of the device's operating status.

[0056] 6. Compact structure and convenient installation and maintenance: The integrated control panel has a display slot and pipeline fixing holes, which realizes the centralized fixing of the heating module and the top cover of the oil-gas separator and the orderly exit of the pipeline, avoiding pipeline mess; the heating module is fixed by bolts, which is convenient for disassembly and assembly, and facilitates daily maintenance and cleaning. Attached Figure Description

[0057] Figure 1 This is a schematic diagram of the structure of a micro-recovery device for laboratory insulating oil proposed in this invention;

[0058] Figure 2 This is a partial structural schematic diagram of a laboratory insulating oil micro-recovery device proposed in this invention;

[0059] Figure 3 This is a schematic diagram of the principle of a micro-recovery device for laboratory insulating oil proposed in this invention;

[0060] Figure 4 This is a partial structural schematic diagram of a laboratory insulating oil micro-recovery device proposed in this invention;

[0061] Figure 5 This is a schematic diagram of the structure of a micro-recovery device for laboratory insulating oil proposed in this invention;

[0062] Figure 6 This is a schematic diagram of the heating module of a micro-recovery device for laboratory insulating oil proposed in this invention.

[0063] Explanation of reference numerals in the attached figures:

[0064] 1. Box body,

[0065] 1-1. Control Panel

[0066] 1-1-1 Display slot; 1-1-2 One-key start button; 1-1-3 Calibration button; 1-1-4 Degassing power button; 1-1-5 Power interface; 1-1-6 Power button; 1-1-7 Communication button; 1-1-8 Setting interface.

[0067] 1-2, Oil inlet pipe; 1-3, Pre-filter; 1-4, Pre-filter oil pipe; 1-5, Heating module.

[0068] 1-5-1, Fixing bracket; 1-5-2, Heating rod; 1-5-3, Compression flange.

[0069] 1-6. Heating oil pipe; 1-7. Oil-gas separator; 1-8. Rotator; 1-9. Oil drain pipe; 1-10. Oil drain pump; 1-11. Exhaust pipe; 1-12. Condenser; 1-13. Vacuum pump; 1-14. Drain pipe; 1-15. Oil wiping cloth; 1-16. Instruction manual.

[0070] 2. Box lid. Detailed Implementation

[0071] The specific embodiments of the present invention are described below with reference to the accompanying drawings and examples:

[0072] It should be noted that the structures, colors, proportions, sizes, etc. shown in the accompanying drawings are only used to complement the content disclosed in the specification, so that those skilled in the art can understand and read them, and are not intended to limit the conditions under which the present invention can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0073] At the same time, in the description of the present invention, it should be understood that the terms "one end", "the other end", "middle", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0074] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of those features.

[0075] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0076] like Figures 1-6 As shown, the present invention proposes a micro-recovery device for laboratory insulating oil, comprising a box body and a box cover connected by hinges. A control panel is provided at the opening of the box body, and an oil inlet is provided on the control panel. An oil inlet pipe is fixedly installed inside the oil inlet. The oil inlet pipe extends through the oil inlet, passes through the control panel, and extends into the inside of the box body. Its end is connected to the oil inlet end of the primary filter.

[0077] The pre-filter is located between the bottom of the housing and the control panel. It contains a 1-3μm glass fiber pleated filter element to intercept dust, metal shavings, carbonized particles, and colloidal impurities in the waste oil. A pre-filter oil pipe is located at the oil outlet of the pre-filter, and the other end of the pre-filter oil pipe is connected to the oil inlet of the heating module. The oil outlet of the heating module is connected to the interior of the oil-gas separator via a heating oil pipe, and then to the oil inlet of the rotary valve.

[0078] The vortexer employs a laterally tangentially eccentric oil inlet guide chamber structure. Its inlet direction is eccentrically set with respect to the chamber axis, causing the oil to enter tangentially and form a swirling flow, dispersing the oil into a semi-mist-like thin layer under no-power conditions. The oil-gas separator and vortexer are integrated into the same sealed chamber, forming a unified structure with a chamber volume of 500mL to 2L, suitable for single-processing of laboratory oil samples.

[0079] The oil-gas separator has an oil drain port at the bottom for connecting to an oil drain pipe, which in turn connects to an oil drain pump. An exhaust port is located at the top of the side wall of the oil-gas separator for connecting to an exhaust pipe, which in turn connects to the air inlet of the condenser. The condenser uses circulating water or air cooling as its cooling medium, and its liquid outlet is connected to a drain pipe. The condenser's extraction port is connected to a vacuum pump, which continuously extracts gas and water vapor from the system.

[0080] The control panel is also equipped with a display slot. The top cover of the heating module and the top cover of the oil-gas separator are fixed in the display slot. The side of the display slot is provided with a primary filter hole, a heating hole, an exhaust hole and an oil drain port, which are used to pass through and fix the primary filter oil pipe, the heating oil pipe, the exhaust pipe and the oil drain pipe, respectively, so as to realize the orderly lead-out and fixation of the pipeline.

[0081] The control panel is also equipped with a temperature gauge and a vacuum gauge. The temperature gauge's probe extends into the heating module to monitor the oil temperature in real time during the heating process. The vacuum gauge is connected to the oil-gas separator through a pipeline to monitor the system's negative pressure in real time, ensuring that it remains stable within a fixed range.

[0082] The control panel features a one-button start, a calibration button, and a degassing power button. The one-button start is used to initiate the insulating oil recovery process. Pressing it automatically executes preset procedures such as primary filtration, heating circulation, vacuum degassing, and automatic shutdown, eliminating the need for manual operation. The calibration button is used to calibrate the vacuum and temperature sensors, ensuring the measurement accuracy of key parameters and maintaining the filter oil temperature within the required range of 40–60°C to prevent excessive temperature from causing insulating oil aging. The degassing power button is used for emergency power-off control of the vacuum pump.

[0083] In addition, the control panel is equipped with necessary power interfaces and a power button. The power interface uses a three-prong socket for connecting to an external power source, and the power button is used to start and stop the entire device. The control panel also includes a communication button and a setting interface. The communication button sends data detected by the temperature and vacuum sensors to the terminal for display, and the setting interface is used to connect to an external terminal for configuring parameters of the insulating oil recovery process.

[0084] The heating module includes a mounting frame that is bolted to the housing. The mounting frame has a mounting cavity, and a heating rod is installed inside the mounting cavity. The insulating oil in the mounting cavity is heated and flows into a heating oil pipe for subsequent recycling. The heating oil pipe is connected to the mounting frame through a clamping flange and a sealing ring.

[0085] The heating rod is a fully enclosed, immersion-type stainless steel PTC thermostatic heating rod. Utilizing the self-limiting temperature characteristics of PTC ceramics, it achieves low-temperature heating of 40–60°C, directly contacting the insulating oil to avoid localized overheating that could lead to oil coking or loss of light components. Precise temperature control reduces oil viscosity, improves degassing and dehydration efficiency, and provides suitable flowability for subsequent cyclone atomization.

[0086] This invention integrates a heating module, a vortex generator, and an oil-gas separator, combining low-temperature heating, non-powered cyclone atomization, and dynamic vacuum degassing to achieve efficient physical regeneration of trace amounts of insulating waste oil in laboratories. Compared with existing traditional large-scale oil filtration equipment, this invention's device is smaller in size, has a processing capacity suitable for laboratory settings, requires no high-temperature heating, no chemical additives, and no frequent replacement of consumables. It has significant advantages such as compact structure, simple operation, good regeneration effect, low operating cost, and environmental friendliness.

[0087] Meanwhile, the control panel is equipped with an oil-wiping cloth and an instruction manual. The oil-wiping cloth allows operators to easily clean the control panel and surrounding area when handling oil samples, connecting pipelines, or performing routine maintenance, promptly wiping away any oil spills and keeping the equipment surface clean and dry. This prevents oil accumulation from affecting the operator's field of vision or creating a slippery hazard, and also prevents oil stains from seeping into button gaps and affecting the lifespan of electrical components. This reflects the device's meticulous consideration in terms of user-friendly operation and convenient daily maintenance. The instruction manual, presented with concise illustrations and text descriptions, is fixed on the control panel. Operators do not need to search for paper documents; they can quickly access the device's start-up and shutdown procedures, parameter setting methods, maintenance points, and common troubleshooting methods on-site. This is especially suitable for laboratory scenarios where multiple personnel take turns using the device, effectively reducing the operational threshold and the risk of misoperation, and improving the ease of use and standardization of operation.

[0088] The working process of a micro-recovery method for laboratory insulating oil, namely the device of the present invention, is as follows:

[0089] 1. Oil inlet and primary filtration: The waste oil to be recycled enters the primary filter through the oil inlet pipe in the oil inlet. After the primary filter removes large mechanical impurities and colloidal impurities, it enters the heating module through the primary filter oil pipe for preheating and viscosity reduction.

[0090] 2. Heating and Circulation: The heating module heats the oil to 40-60℃ and achieves constant temperature control through the self-limiting temperature characteristic of PTC ceramic to avoid local overheating. The heated insulating oil is then sent to the rotary chamber inside the oil-gas separator through the heated oil pipe.

[0091] 3. Swirl Atomization and Gas-Liquid Separation: The insulating oil enters the rotator tangentially and eccentrically, forming a swirling flow under no-power conditions, and is dispersed into a semi-mist-like thin layer. Under the continuous suction of the vacuum pump, the oil-gas separator maintains a slightly negative pressure state, and the dissolved hydrogen, acetylene, air, and moisture in the oil rapidly escape. The separated moisture enters the condenser as water vapor through the drain pipe, liquefies after cooling, and is discharged through the drain pipe; the gas is extracted by the vacuum pump.

[0092] 4. Oil discharge: The treated oil collects at the bottom of the oil-gas separator under gravity and is discharged by the oil pump through the oil drain pipe. The collected oil can be reused as experimental oil or blank oil.

[0093] Throughout the entire process, the heating module and the top cover of the oil-gas separator are fixed together in the display slot of the control panel. The oil outlet of the primary filter pipe, heating pipe, oil drain pipe and oil pump are led out through the corresponding primary filter hole, heating hole, oil drain hole and clean oil hole, respectively. The primary filter pipe, heating pipe, oil drain pipe and drain pipe are all made of transparent flexible tubing, which makes it easy for operators to intuitively observe the flow status, color change and bubble situation of the oil in each processing stage, and realize real-time monitoring of the operating status of the device.

[0094] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

[0095] Many other changes and modifications can be made without departing from the concept and scope of this invention. It should be understood that this invention is not limited to the specific embodiments, and the scope of this invention is defined by the appended claims.

Claims

1. A miniature laboratory insulating oil recovery device, Its features are, Includes a case body and lid connected by hinges. The opening of the housing is provided with a control panel, the control panel is provided with an oil inlet, the oil inlet is provided with an oil inlet pipe, and the oil inlet pipe extends through the control panel to the pre-filter inside the housing. The primary filter is located between the bottom of the housing and the control panel. It is equipped with a 1-3μm glass fiber pleated filter element. The oil outlet of the primary filter is connected to a heating module through a primary filter oil pipe. The oil outlet of the heating module is connected to an oil-gas separator via a heating oil pipe. The oil-gas separator is equipped with a rotator inside. The oil outlet of the heating module is connected to the oil inlet of the rotator via the heating oil pipe. The bottom of the oil-gas separator is provided with an oil drain port for connecting an oil drain pipe, and the oil drain pipe is connected to an oil drain pump; the top of the side wall of the oil-gas separator is provided with an exhaust port for connecting an exhaust pipe, and the exhaust pipe is connected to a condenser. The condenser's exhaust port is connected to a vacuum pump, and the condenser's liquid outlet is connected to a drain pipe. The oil-gas separator and the rotary valve are integrated into the same sealed cavity, with a cavity volume of 500mL to 2L.

2. The laboratory insulating oil micro-recovery device as described in claim 1, Its features are, The control panel is provided with a display slot. The top cover of the heating module and the top cover of the oil-gas separator are fixed in the display slot. The side of the display slot is provided with a primary filter hole, a heating hole, an exhaust hole and an oil drain port, which are used to pass through and fix the primary filter oil pipe, the heating oil pipe, the exhaust pipe and the oil drain pipe respectively. The primary filter pipe, heating pipe, oil drain pipe, and drain pipe are all transparent flexible tubes.

3. A laboratory insulating oil micro-recovery device as described in claim 1, Its features are, The control panel is equipped with a temperature gauge and a vacuum gauge. The temperature probe of the temperature gauge extends into the heating module, and the vacuum gauge is connected to the inside of the oil-gas separator through a pipeline.

4. A micro-recovery device for laboratory insulating oil as described in claim 1, Its features are, The control panel is equipped with a one-key start button, a calibration button, and a degassing power button. The one-button start is used to start the insulating oil recycling process. After being pressed, it automatically performs the primary filtration, heating cycle, vacuum degassing and automatic shutdown procedures. The calibration button is used to calibrate the vacuum sensor and the temperature sensor. The degassing power button is used to control the emergency power-off of the vacuum pump.

5. A micro-recovery device for laboratory insulating oil as described in claim 1, Its features are, The control panel is also equipped with a power interface, a power button, a communication button, and a settings interface; The power interface is used to connect to an external power source, and the power button is used to control the overall start and stop of the device. The communication button is used to send the data detected by the temperature sensor and vacuum sensor to the terminal for display. The configuration interface is used to connect to an external terminal to configure parameters for the insulating oil recycling process.

6. A laboratory insulating oil micro-recovery device as described in claim 1, Its features are, The heating module includes a mounting frame that is bolted to the housing. The mounting frame has a mounting cavity, in which a heating rod is installed. The heating oil pipe is connected to the mounting frame via a clamping flange and a sealing ring.

7. A micro-recovery device for laboratory insulating oil as described in claim 1, Its features are, The heating rod is a fully enclosed immersion stainless steel PTC constant temperature heating rod, which achieves low-temperature heating of 40-60℃ through the self-limiting temperature characteristics of PTC ceramic.

8. A micro-recovery device for laboratory insulating oil as described in claim 1, Its features are, The cooling medium of the condenser is circulating water or air cooling, and its liquid outlet is connected to a drain pipe.

9. A micro-recovery device for laboratory insulating oil as described in claim 2, Its features are, The rotator adopts a lateral tangential eccentric oil inlet guide cavity structure, and its inlet direction is eccentrically set with respect to the cavity axis.

10. A method for micro-recovery of laboratory insulating oil, using the laboratory insulating oil micro-recovery device as described in any one of claims 1 to 9. Its features are, Includes the following steps: Step S1: Oil inlet and initial filtration, The waste oil to be recycled enters the primary filter through the oil inlet pipe. After removing impurities, it enters the heating module for preheating and viscosity reduction. Step S2: Heating and circulation, The heating module heats the oil to 40-60°C and maintains a constant temperature. The heated insulating oil is then fed into the rotary valve. Step S3: Cyclone atomization and gas-liquid separation, Insulating oil enters the rotator and forms a swirling flow, dispersing into a semi-mist-like thin layer. Under the continuous suction of the vacuum pump, the oil-gas separator maintains a slightly negative pressure state, and the dissolved gas and water in the oil escape rapidly. The water vapor is cooled and liquefied by the condenser and then discharged, while the gas is extracted by the vacuum pump. Step S4: Oil discharge. The treated oil collects at the bottom of the oil-gas separator under gravity and is discharged by the oil discharge pump through the oil discharge pipe.

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