Ester insulating liquid water content automatic adjusting device and method based on ultrasonic atomization

Abstract

Disclosed is an ester insulating liquid water content automatic regulating device and method based on ultrasonic atomization, wherein a sealed reaction container is used to store ester insulating liquid; an ultrasonic atomizer is used to shake deionized water into micron-sized water mist; a mist guide pipeline is used to connect the ultrasonic atomizer and the sealed reaction container, so as to introduce the micron-sized water mist into the upper region of the sealed reaction container, and form a uniformly distributed environment above the ester insulating liquid; a magnetic stirring and heating device is arranged at the bottom of the sealed reaction container, and includes a magnetic stirring rod and a constant-temperature magnetic stirring base, and is used to stir and heat the ester insulating liquid; a Coulomb method Karl Fischer moisture meter is used to detect the water content of the ester insulating liquid; a controller is connected to the ultrasonic atomization module and the Coulomb method Karl Fischer moisture meter, and the opening time of the ultrasonic atomizer is dynamically adjusted according to the water content measured by the moisture meter.

Description

Technical Field

[0001] This invention relates to the field of power equipment insulation medium performance evaluation technology, and in particular to an automatic adjustment device and method for the water content of ester-based insulating liquid based on ultrasonic atomization. Background Technology

[0002] Ester-based insulating liquids, represented by natural and synthetic esters, have been widely used in power equipment such as oil-immersed transformers in recent years due to their high flash point and biodegradability. Compared with traditional mineral insulating oils, ester-based insulating liquids have significant advantages in fire resistance and environmental friendliness, and have gradually become an important development direction for insulating media in power equipment. Compared with mineral insulating oils, ester-based insulating liquids have a higher saturated water content. In the actual operation of power equipment, the water content in the insulating liquid is one of the important factors affecting its electrical performance. Increased moisture content reduces the breakdown strength of the insulating liquid, lowers the initiation voltage of partial discharge, and accelerates the aging process of the insulating material. Therefore, when conducting research on the electrical properties of ester-based insulating liquids, it is usually necessary to conduct experiments under different water content conditions to analyze the influence of moisture on its insulation performance.

[0003] Currently, the common method for preparing insulating liquids with different water contents is to directly add a measured amount of deionized water to the insulating liquid and promote water dissolution through mechanical stirring. However, this method has shortcomings. Due to the high viscosity of ester-based insulating liquids, the added water tends to exist in the form of dispersed droplets in the oil, which is difficult to completely dissolve in a short time, requiring continuous mechanical stirring, and the preparation process is time-consuming. In addition, existing methods mainly rely on manual control of the amount of water added and the stirring time, making it difficult to continuously and stably prepare ester-based insulating liquid samples with different water contents, which is insufficient to meet research needs.

[0004] The information disclosed in the background section is only intended to enhance the understanding of the background of the present invention, and therefore may contain information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] To address the shortcomings or defects of the existing technology, an automatic water content adjustment device and method for ester-based insulating liquid based on ultrasonic atomization is provided. This solves the problems of uneven water distribution, low dissolution efficiency, and insufficient control capability in the water content adjustment process of ester-based insulating liquid.

[0006] The objective of this invention is achieved through the following technical solutions.

[0007] An automatic moisture content adjustment device for ester-based insulating liquid based on ultrasonic atomization includes:

[0008] A sealed reaction vessel containing an ester-based insulating liquid;

[0009] An ultrasonic atomizer vibrates deionized water into micron-sized water mist.

[0010] A mist guiding pipe connects the ultrasonic atomizer to the sealed reaction container to introduce the micron-sized water mist into the area above the sealed reaction container, so that the water mist forms a uniformly distributed environment above the ester insulating liquid.

[0011] A magnetic stirring and heating device is installed at the bottom of the sealed reaction vessel, including a magnetic stir bar and a constant temperature magnetic stirring base, for stirring and heating the ester insulating liquid, with the temperature controlled within the range of 40℃ to 60℃;

[0012] The Coulomb Karl Fischer moisture analyzer is used to detect the water content of ester-based insulating liquids.

[0013] The controller connects the ultrasonic atomization module and the Coulomb-Karl Fischer moisture analyzer, and dynamically adjusts the on-time of the ultrasonic atomizer according to the moisture content measured by the moisture analyzer.

[0014] In the aforementioned automatic water content adjustment device for ester insulating liquid based on ultrasonic atomization, the sealed reaction container is a transparent container made of high borosilicate glass, with a sealed sampling port on the side wall.

[0015] In the aforementioned automatic water content adjustment device for ester insulating liquid based on ultrasonic atomization, the water mist generated by the ultrasonic atomizer has a diameter of 1-10 micrometers.

[0016] In the aforementioned automatic water content adjustment device for ester insulating liquid based on ultrasonic atomization, the outlet end of the mist guiding pipe is located 2-5 cm above the liquid surface of the ester insulating liquid inside the sealed reaction container.

[0017] In the aforementioned automatic water content adjustment device for ester insulating liquid based on ultrasonic atomization, the temperature control accuracy of the constant temperature magnetic stirring base is ±1℃.

[0018] The aforementioned automatic moisture content adjustment device for ester insulating liquid based on ultrasonic atomization further includes a pipette for extracting ester insulating liquid samples and sending them to a coulomb Karl Fischer moisture analyzer for testing.

[0019] In the aforementioned automatic moisture content adjustment device for ester-based insulating liquid based on ultrasonic atomization, the controller includes:

[0020] The target moisture content setting module is used to set the target moisture content value;

[0021] The data acquisition module is used to receive real-time moisture content data returned by the Coulomb Karl Fischer moisture analyzer;

[0022] The comparison and judgment module is used to compare real-time moisture content data with target moisture content values;

[0023] The control execution module is used to control the activation duration of the ultrasonic atomization module based on the comparison results.

[0024] The aforementioned automatic moisture content adjustment device for ester-based insulating liquid based on ultrasonic atomization also includes,

[0025] The data recording module is used to record the temperature, water content, and atomization time during the preparation process;

[0026] The alarm module issues an alarm signal when the moisture content exceeds the preset range;

[0027] The remote monitoring module is used to enable remote monitoring and operation of the device.

[0028] A method for adjusting the water content of an ester-based insulating liquid based on ultrasonic atomization, as described above, includes:

[0029] S1. Inject the pre-dried ester insulating liquid into the sealed reaction vessel and turn on the constant temperature magnetic stir base for preheating;

[0030] S2. Set the target moisture content value using the controller;

[0031] S3. Start the ultrasonic atomizer to agitate the deionized water into micron-sized water mist, and introduce it into the area above the sealed reaction container through the mist guide pipe.

[0032] S4. Water mist forms a uniformly distributed environment above the oil, and is quickly captured by the ester insulating liquid when it settles to the surface of the oil.

[0033] S5. Take samples periodically through the sealed sampling port and use a coulometric Karl Fischer moisture analyzer to determine the moisture content;

[0034] S6. The controller dynamically adjusts the activation duration of the ultrasonic atomization module according to the detected moisture content until the target moisture content is reached.

[0035] S7. Turn off the ultrasonic atomization module and continue stirring for a period of time to ensure that the moisture is completely and evenly distributed.

[0036] In the method described, the target moisture content is set within the range of 100-5000 ppm, the sampling interval is 5-10 minutes, and the sampling volume is 1-2 ml.

[0037] Compared with existing technologies, the beneficial effects of this invention are as follows: The ultrasonic atomizer vibrates deionized water at high frequency into uniform fine water mist of 1–10 micrometers. This size is much smaller than the millimeter-sized water droplets formed by the traditional droplet method, greatly increasing the contact surface area between water and ester-based insulating liquid. Simultaneously, the mist guiding pipe precisely guides the water mist into the space above the oil, allowing it to slowly settle in the form of an aerosol, avoiding localized supersaturation and the formation of free water droplets. This significantly improves the dissolution rate and uniformity of water distribution in high-viscosity ester-based liquids. Combined with constant-temperature magnetic stirring at 40–60°C, this reduces oil viscosity, enhances molecular diffusion, and maintains system temperature stability, preventing water accumulation due to localized condensation or temperature fluctuations. More importantly, through an online detection loop formed by a sealed sampling port and a Coulomb Karl Fischer moisture analyzer, the controller can acquire real-time water content data and dynamically adjust the operating time of the ultrasonic atomizer accordingly, achieving a closed-loop control logic of "atomization—dissolution—detection—feedback—readjustment". This mechanism completely changes the traditional manual experience-based water addition method, not only improving the accuracy of water content control to within ±50 ppm, but also shortening the preparation cycle from several hours to within 30 minutes. It effectively solves the core problems of slow water dissolution, uneven distribution, and poor repeatability in existing technologies, and provides reliable technical support for carrying out high-precision and high-efficiency research on the electrical properties of ester insulating liquids.

[0038] The description provided is merely an overview of the technical solution of this invention. In order to make the technical means of this invention clearer and more understandable, so that those skilled in the art can implement it according to the contents of the specification, and to make the described and other objects, features and advantages of this invention more obvious and understandable, specific embodiments of this invention are described below. Attached Figure Description

[0039] Various other advantages and benefits of the present invention will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0040] In the attached diagram:

[0041] Figure 1 This is a schematic diagram of the structure provided for an embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram illustrating the change in water content of natural ester insulating liquid over time after atomization is activated, as provided in an embodiment of the present invention.

[0043] The present invention will be further explained below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0044] Specific embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0045] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that different terms may be used to refer to the same component. This specification and claims do not distinguish components based on differences in terminology, but rather on differences in function. The terms "comprising" or "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising but not limited to." The following descriptions are preferred embodiments for carrying out the invention; however, these descriptions are for the purpose of understanding the general principles of the specification and are not intended to limit the scope of the invention. The scope of protection of this invention is determined by the appended claims.

[0046] To facilitate understanding of the embodiments of the present invention, the following will provide further explanation and description with reference to the accompanying drawings and several specific embodiments, and the accompanying drawings do not constitute a limitation on the embodiments of the present invention.

[0047] To better understand, such as Figures 1 to 2 As shown, an automatic moisture content adjustment device for ester-based insulating liquid based on ultrasonic atomization includes:

[0048] A sealed reaction vessel 3 contains an ester-based insulating liquid 4.

[0049] Ultrasonic atomizer 1, which vibrates deionized water into micron-sized water mist;

[0050] The mist guiding pipe 2 connects the ultrasonic atomizer 1 and the sealed reaction container 3 to introduce the micron-sized water mist into the area above the sealed reaction container 3, so that the water mist forms a uniformly distributed environment above the ester insulating liquid 4.

[0051] A magnetic stirring and heating device is installed at the bottom of the sealed reaction vessel 3, including a magnetic stir bar 5 and a constant temperature magnetic stirring base 6, for stirring and heating the ester insulating liquid, with the temperature controlled within the range of 40℃ to 60℃.

[0052] The Coulomb Karl Fischer moisture analyzer 8 is used to detect the moisture content of ester-based insulating liquids.

[0053] The controller 9 is connected to the ultrasonic atomization module and the Coulomb Karl Fischer moisture analyzer 8, and dynamically adjusts the on-time of the ultrasonic atomizer 1 according to the moisture content measured by the moisture analyzer.

[0054] In a preferred embodiment of the automatic water content adjustment device for ester insulating liquid based on ultrasonic atomization, the sealed reaction container 3 is a transparent container made of high borosilicate glass, and a sealed sampling port 7 is provided on the side wall.

[0055] In a preferred embodiment of the automatic water content adjustment device for ester insulating liquid based on ultrasonic atomization, the water mist generated by the ultrasonic atomizer 1 has a diameter of 1-10 micrometers.

[0056] In a preferred embodiment of the ultrasonic atomization-based automatic water content adjustment device for ester insulating liquid, the outlet end of the mist guiding pipe 2 is located 2-5 cm above the surface of the ester insulating liquid inside the sealed reaction container 3.

[0057] In a preferred embodiment of the automatic water content adjustment device for ester insulating liquid based on ultrasonic atomization, the temperature control accuracy of the constant temperature magnetic stirring base 6 is ±1℃.

[0058] In a preferred embodiment of the automatic moisture content adjustment device for ester insulating liquid based on ultrasonic atomization, the device further includes a pipette 10 for extracting ester insulating liquid samples and sending them to a coulomb Karl Fischer moisture analyzer 8 for testing.

[0059] In a preferred embodiment of the automatic moisture content adjustment device for ester-based insulating liquid based on ultrasonic atomization, the controller 9 includes:

[0060] The target moisture content setting module is used to set the target moisture content value;

[0061] The data acquisition module is used to receive real-time moisture content data returned by the Coulomb Karl Fischer moisture analyzer 8;

[0062] The comparison and judgment module is used to compare real-time moisture content data with target moisture content values;

[0063] The control execution module is used to control the activation duration of the ultrasonic atomization module based on the comparison results.

[0064] In a preferred embodiment of the automatic moisture content adjustment device for ester-based insulating liquid based on ultrasonic atomization, it further includes,

[0065] The data recording module is used to record the temperature, water content, and atomization time during the preparation process;

[0066] The alarm module issues an alarm signal when the moisture content exceeds the preset range;

[0067] The remote monitoring module is used to enable remote monitoring and operation of the device.

[0068] A method for adjusting the water content of an ester-based insulating liquid based on ultrasonic atomization includes:

[0069] S1. Inject the pre-dried ester insulating liquid into the sealed reaction vessel 3, and turn on the constant temperature magnetic stirring base 6 for preheating;

[0070] S2. Set the target moisture content value via controller 9;

[0071] S3. Start the ultrasonic atomizer 1 to agitate the deionized water into micron-sized water mist, and introduce it into the area above the sealed reaction container 3 through the mist guide pipe 2.

[0072] S4. Water mist forms a uniformly distributed environment above the oil, and is quickly captured by the ester insulating liquid when it settles to the surface of the oil.

[0073] S5. Take samples periodically through the sealed sampling port 7 and use a coulometric Karl Fischer moisture analyzer 8 to detect the moisture content;

[0074] S6 and controller 9 dynamically adjust the activation duration of the ultrasonic atomization module according to the detected moisture content until the target moisture content is reached.

[0075] S7. Turn off the ultrasonic atomization module and continue stirring for a period of time to ensure that the moisture is completely and evenly distributed.

[0076] In a preferred embodiment of the method, the target moisture content is set in the range of 100-5000 ppm, the sampling interval is 5-10 minutes, and the sampling volume is 1-2 ml.

[0077] In one embodiment, the present invention includes a sealed reaction container 3, an ultrasonic atomizer 1, a mist guiding pipe 2, a magnetic stirring and heating device, a Coulomb-Karl Fischer moisture analyzer 8, and a controller 9. The sealed reaction container 3 is a transparent container made of borosilicate glass and is used to hold an ester-based insulating liquid. The top of the sealed reaction container 3 is equipped with an atomization interface connected to an ultrasonic atomization module. The ultrasonic atomization module contains the ultrasonic atomizer 1, which can atomize deionized water into a stream with a diameter of [missing information]. The water mist is introduced into the upper region of the sealed reaction container 3 via a mist guide pipe 2. This creates a uniform distribution environment above the oil, allowing the water mist to be quickly captured by the ester insulating liquid upon settling onto the oil surface, preventing the formation of free water droplets. A magnetic stirring and heating device, including a magnetic stir bar 5 and a thermostatic magnetic stirring base 6, is located at the bottom of the sealed reaction container 3. This device stirs and heats the ester insulating liquid, maintaining the temperature between 40°C and 60°C to reduce the viscosity of the oil and promote moisture diffusion. A sealed sampling port 7 is located on the side wall of the sealed reaction container 3. After sampling using a micropipette 10, the sample is directly fed into a coulometric Karl Fischer moisture analyzer 8 for moisture content detection. The controller 9 dynamically adjusts the operating time of the ultrasonic atomization module based on the data returned by the coulometric moisture analyzer, thereby enabling the preparation of samples with specific moisture contents.

[0078] When using this invention, the pre-dried ester-based insulating liquid is first injected into the sealed reaction container 3, and the constant-temperature magnetic stirring base 6 is turned on for preheating. Based on the target water content (e.g., 1000 ppm), the ultrasonic atomization module is activated via the controller 9. Micron-sized water mist reaches the surface of the oil sample through the mist guide tube 2 and dissolves rapidly with stirring. During the preparation process, samples are taken periodically through the sampling port and calibrated using a coulometric moisture analyzer. Once the preset water content is reached, the controller 9 shuts off the atomization module, and stirring continues for a period of time to ensure thorough and uniform water distribution.

[0079] Example: Preparation of a natural ester insulating liquid with a water content of 1000 ppm

[0080] 1. Inject 1 L of soybean-based natural ester with an initial moisture content of 50 ppm into a sealed reaction vessel, start constant temperature stirring at 50 °C, and preheat for 10 min;

[0081] 2. The controller is set to a target moisture content of 1000 ppm;

[0082] 3. Turn on the ultrasonic atomizer and introduce water mist into the reaction vessel;

[0083] 4. Take a sample every 5 minutes through the sealed sampling port and measure the moisture content using a coulomb Karl Fischer moisture analyzer;

[0084] 5. The controller 9 dynamically adjusts the on-time of the ultrasonic atomization module according to the detected moisture content. When the detected moisture content deviates from the set value by more than 200 ppm, the controller controls the ultrasonic atomization module to atomize continuously. When the detected moisture content deviates from the set value by less than 200 ppm, the controller controls the ultrasonic atomization module to atomize intermittently.

[0085] 6. Once the moisture content reaches the target level, turn off the atomizer and continue stirring for 5 minutes to ensure complete uniformity of the moisture content.

[0086] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0087] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations therein.

Claims

1. An automatic moisture content adjustment device for ester-based insulating liquid based on ultrasonic atomization, characterized in that, It includes, A sealed reaction vessel containing an ester-based insulating liquid; An ultrasonic atomizer vibrates deionized water into micron-sized water mist. A mist guiding pipe connects the ultrasonic atomizer to the sealed reaction container to introduce the micron-sized water mist into the area above the sealed reaction container, so that the water mist forms a uniformly distributed environment above the ester insulating liquid. A magnetic stirring and heating device is installed at the bottom of the sealed reaction vessel, including a magnetic stir bar and a constant temperature magnetic stirring base, for stirring and heating the ester insulating liquid, with the temperature controlled within the range of 40℃ to 60℃; The Coulomb Karl Fischer moisture analyzer is used to detect the water content of ester-based insulating liquids. The controller connects the ultrasonic atomization module and the Coulomb-Karl Fischer moisture analyzer, and dynamically adjusts the on-time of the ultrasonic atomizer according to the moisture content measured by the moisture analyzer.

2. The automatic moisture content adjustment device for ester insulating liquid based on ultrasonic atomization as described in claim 1, characterized in that, Preferably, the sealed reaction vessel is a transparent container made of high borosilicate glass, with a sealed sampling port on the side wall.

3. The automatic moisture content adjustment device for ester insulating liquid based on ultrasonic atomization as described in claim 1, characterized in that, The water mist produced by the ultrasonic atomizer has a diameter of 1-10 micrometers.

4. The automatic moisture content adjustment device for ester insulating liquid based on ultrasonic atomization as described in claim 1, characterized in that, The outlet end of the mist guide pipe is located 2-5 cm above the surface of the ester-based insulating liquid inside the sealed reaction container.

5. The automatic moisture content adjustment device for ester insulating liquid based on ultrasonic atomization as described in claim 1, characterized in that, The temperature control accuracy of the constant temperature magnetic stirring base is ±1℃.

6. The automatic moisture content adjustment device for ester-based insulating liquid based on ultrasonic atomization as described in claim 1, characterized in that, The device also includes a pipette for extracting ester-based insulating liquid samples and feeding them into a coulomb Karl Fischer moisture analyzer for testing.

7. The automatic moisture content adjustment device for ester insulating liquid based on ultrasonic atomization as described in claim 1, characterized in that, The controller includes: The target moisture content setting module is used to set the target moisture content value; The data acquisition module is used to receive real-time moisture content data returned by the Coulomb Karl Fischer moisture analyzer; The comparison and judgment module is used to compare real-time moisture content data with target moisture content values; The control execution module is used to control the activation duration of the ultrasonic atomization module based on the comparison results.

8. The automatic moisture content adjustment device for ester insulating liquid based on ultrasonic atomization as described in claim 1, characterized in that, It also includes, The data recording module is used to record the temperature, water content, and atomization time during the preparation process; The alarm module issues an alarm signal when the moisture content exceeds the preset range; The remote monitoring module is used to enable remote monitoring and operation of the device.

9. A method for adjusting the water content of an ester-based insulating liquid based on ultrasonic atomization, as described in any one of claims 1-8, characterized in that, It includes, S1. Inject the pre-dried ester insulating liquid into the sealed reaction vessel and turn on the constant temperature magnetic stir base for preheating; S2. Set the target moisture content value using the controller; S3. Start the ultrasonic atomizer to agitate the deionized water into micron-sized water mist, and introduce it into the area above the sealed reaction container through the mist guide pipe. S4. Water mist forms a uniformly distributed environment above the oil, and is quickly captured by the ester insulating liquid when it settles to the surface of the oil. S5. Take samples periodically through the sealed sampling port and use a coulometric Karl Fischer moisture analyzer to determine the moisture content; S6. The controller dynamically adjusts the activation duration of the ultrasonic atomization module according to the detected moisture content until the target moisture content is reached. S7. Turn off the ultrasonic atomization module and continue stirring for a period of time to ensure that the moisture is completely and evenly distributed.

10. The method as described in claim 9, characterized in that, The target moisture content value is set within the range of 100-5000 ppm, the sampling interval is 5-10 minutes, and the sample volume is 1-2 ml.

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