Insulating liquid preparation method and insulating liquid preparation device for laboratory

Abstract

The invention relates to the technical field of insulating liquid preparation, and discloses a laboratory insulating liquid preparation method and an insulating liquid preparation device.The laboratory insulating liquid preparation method comprises the following steps that S1, an insulating liquid is subjected to dehydration and degassing treatment; s2, adding the insulating liquid into a solution bottle, and putting the solution bottle into an ultrasonic water bath; s3, setting treatment power and treatment time of the ultrasonic water bath pool through a control system, and introducing water vapor into the solution bottle through a guide pipe; s4, sampling the solution bottle for at least three times, detecting the moisture content a of each group of sampling liquid, and calculating the moisture average value b of the insulating liquid; s5, if a-b is less than or equal to + / -10ppm, completing the preparation of the insulating liquid; and if a-b is greater than + / -10ppm, prolonging the treatment time of the ultrasonic water bath, and repeating the step S4 until a-b is less than or equal to + / -10ppm. Rapid mixing of water and the insulating liquid can be achieved through ultrasonic vibration, and the efficiency and the experiment process of preparing the insulating liquid with the specific water content in a laboratory are improved.

Description

Technical Field

[0001] The invention relates to the technical field of insulating liquid preparation, and in particular to a method and a device for preparing insulating liquid for laboratory use. Background Art

[0002] Ester insulating fluids have attracted wide attention as an alternative insulating medium to mineral oil in transformer equipment applications due to their environmental friendliness, high ignition point, and biodegradability. Using ester insulating fluids to refill mineral oil transformers has gradually become a popular way to transform old grid assets. Studies have shown that ester insulating fluids have good saturated water solubility, can absorb moisture from cellulose paper, reduce the hydrolysis rate of cellulose paper, and delay the aging of transformer oil-paper insulation systems. However, water, as a polar substance, exists in ester insulating fluids, which may cause the dielectric strength of the liquid to decrease, leading to the risk of partial discharge or even breakdown. Therefore, it is necessary to study the insulating properties of insulating fluids with different water contents.

[0003] In the laboratory, there are two main ways to prepare insulating liquids with different water contents. One is to add an appropriate amount of distilled water to the insulating liquid based on the mass ratio to obtain an insulating liquid with a certain water content ratio; the other is to place the insulating liquid in an incubator with a certain humidity for a certain period of time, and the humidity of the insulating liquid is balanced with the humidity in the incubator. However, when preparing the insulating liquid in the above two methods, the distribution of water in the insulating liquid is not uniform, resulting in obvious small bridge breakdown phenomenon, and the experimental data cannot fully characterize the insulating performance of the insulating liquid. If the water and the insulating liquid are to be fully mixed, it needs to be left to stand for a long time, and when preparing an insulating liquid with a certain moisture content gradient, the experimental time will increase exponentially, seriously delaying the experimental progress. Summary of the invention

[0004] The purpose of the present invention is to provide a method for preparing an insulating liquid for laboratory use, so as to solve the problem of long standing time and slow experimental progress when preparing insulating liquid in the laboratory in the prior art; the present invention also provides an insulating liquid preparation device using the method for preparing insulating liquid for laboratory use.

[0005] In order to achieve the above object, the present invention provides a method for preparing an insulating liquid for laboratory use, comprising the following steps:

[0006] S1, first dehydrating and degassing the insulating liquid so that the water content of the insulating liquid after treatment is less than or equal to 100 ppm;

[0007] S2, adding the insulating liquid treated in step S1 into a solution bottle, placing the solution bottle into an ultrasonic water bath, connecting the ultrasonic generator and the solution bottle with a catheter, connecting the ultrasonic water bath to a control system, and adding water into the ultrasonic water bath so that the water level of the ultrasonic water bath is higher than the insulating liquid level in the solution bottle;

[0008] S3, setting the processing power and processing time of the ultrasonic water bath through the control system, starting the water vapor generator and the ultrasonic water bath, and the water vapor generated by the water vapor generator is introduced into the solution bottle through the conduit;

[0009] S4, sampling the solution bottle at least three times to obtain at least three groups of sampled liquids, each group of sampling has a different sampling point position, detecting the water content a of each group of sampled liquids, and calculating the average water content b of the insulating liquid;

[0010] S5, if ab≤±10ppm, the preparation of the insulating liquid is completed; if ab>±10ppm, the processing time of the ultrasonic water bath is extended, and step S4 is repeated until ab≤±10ppm.

[0011] Preferably, in step S1, the insulating liquid is placed in a vacuum oven, the working temperature and working time of the vacuum oven are set, and the water content c of the insulating liquid is detected after the vacuum oven finishes working, until c≤100ppm.

[0012] Preferably, the working temperature of the vacuum oven is 60° C. and the working time is 48 hours.

[0013] Preferably, in step S3, the ultrasonic water bath first operates at the first processing power for a first time, and then operates at the second processing power for a second time, and the ultrasonic water bath is stopped for at least 10 minutes between the two operations.

[0014] Preferably, the first processing power is the same as the second processing power, and the first time is greater than the second time.

[0015] Preferably, in step S3, when the water vapor generator introduces water vapor into the solution bottle through the conduit, water vapor is first introduced at a first flow rate for a first duration, and then water vapor is introduced at a second flow rate for a second duration, and the first flow rate is greater than the second flow rate.

[0016] Preferably, in step S4, the heights of the sampling points of each group of samples are different.

[0017] Preferably, in step S5, if ±10ppm≤ab≤±20ppm, the treatment time of the ultrasonic water bath is extended by 30 minutes; if ±20ppm≤ab≤±30ppm, the treatment time of the ultrasonic water bath is extended by 60 minutes; if ±30ppm≤ab≤±40ppm, the treatment time of the ultrasonic water bath is extended by 90 minutes.

[0018] The present invention also provides an insulating liquid preparation device, which adopts the laboratory insulating liquid preparation method described in any of the above technical solutions, including a water vapor generator, an ultrasonic water bath, a solution bottle, a catheter and a control system, wherein the solution bottle is arranged in the ultrasonic water bath, the water vapor generator is connected to the solution bottle, the catheter is also connected to a control valve, the control system is electrically connected to the ultrasonic water bath, and the control system is used to transmit a power signal and a time signal to the ultrasonic water bath.

[0019] Preferably, the ultrasonic water bath is further provided with a support net and a drain outlet, the solution bottle is placed on the support net, and the drain outlet is located at the lower side of the support net.

[0020] Compared with the prior art, the method and device for preparing an insulating liquid for laboratory use of the embodiment of the present invention have the following beneficial effects: when preparing an insulating liquid with a target water content, the insulating liquid is first dehydrated and degassed so that the water content of the insulating liquid after the treatment is less than or equal to 100 ppm. At this time, the initial water content in the insulating liquid is extremely small, which can reduce the influence of the initial water content of the insulating liquid on the prepared insulating liquid; the processing power and processing time of the ultrasonic water bath are controlled by a control system, and ultrasonic waves are used to make water and insulating liquid mix and collide at the molecular level. At the same time, the difference between the water content of each sampled liquid and the average water content is compared through multiple sampling to ensure that the water content of the insulating liquid is the same everywhere, and ultrasonic vibration can achieve rapid mixing of water and insulating liquid, which speeds up the efficiency and experimental process of preparing insulating liquid with a specific water content in the laboratory. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic flow chart of the method for preparing the laboratory insulating liquid of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the insulating liquid preparation device of the present invention.

[0023] In the figure, 1. water vapor generator, 2. ultrasonic water bath, 3. solution bottle, 31. sampling point, 4. catheter, 5. control system, 6. rubber plug, 7. control valve, 8. support net, 9. drain outlet, and 10. drain valve. DETAILED DESCRIPTION

[0024] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "between", "adjacent", "close to", "inside", "outside", etc. used in the present invention to indicate the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] The terms "first", "second", "third", and "fourth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] A preferred embodiment of a method for preparing a laboratory insulating liquid of the present invention is as follows: Figure 1 and Figure 2 As shown, the laboratory insulating liquid preparation method can prepare insulating liquid with a specific water content.

[0028] The method for preparing the laboratory insulating liquid comprises the following steps:

[0029] S1, first dehydrate and degas the insulating liquid, so that the water content of the treated insulating liquid is less than or equal to 100ppm. Dehydrate and degas the insulating liquid so that the water content of the insulating liquid is less than or equal to 100ppm, so that the water content of the insulating liquid before preparation is very small and is basically in a water-free state, so as to avoid the initial water content of the insulating liquid affecting the water content of the insulating liquid finally prepared.

[0030] S2, add the insulating liquid treated in step S1 into the solution bottle 3, place the solution bottle 3 into the ultrasonic water bath 2, use the catheter 4 to connect the ultrasonic generator and the solution bottle 3, connect the ultrasonic water bath 2 to the control system 5, and add water to the ultrasonic water bath 2 so that the water level of the ultrasonic water bath 2 is higher than the insulating liquid level in the solution bottle 3.

[0031] Before adding the insulating liquid into the solution bottle 3, the solution bottle 3 is first dried to remove the water in the solution bottle 3 to ensure that the water content of the insulating liquid finally prepared is consistent with the target water content. The water level of the ultrasonic water bath 2 is ensured to be higher than the insulating liquid level in the solution bottle 3, so that the insulating liquid is completely immersed below the water level of the ultrasonic water bath 2, and the ultrasonic wave can enter the solution bottle 3 through the water in the water bath to evenly vibrate and mix the insulating liquid in various places in the solution bottle 3, so that the water content of the insulating liquid at different positions is consistent.

[0032] S3, setting the processing power and processing time of the ultrasonic water bath 2 through the control system 5, starting the water vapor generator 1 and the ultrasonic water bath 2, and the water vapor generated by the water vapor generator 1 is passed through the conduit 4 to the solution bottle 3.

[0033] According to the target water content of the insulating liquid to be prepared, the control system 5 can adjust the ultrasonic power and operation time of the ultrasonic water bath 2, which is suitable for preparing insulating liquids with different water contents. By adjusting the rate and time of the water vapor from the water vapor generator 1 entering the solution bottle 3, the rate of the insulating liquid mixing with the water vapor can be adjusted so that the insulating liquid and the water vapor are evenly mixed. When the target water content of the insulating liquid is high, the water vapor introduction time can be extended, and the processing time of the ultrasonic water bath 2 can be extended synchronously to ensure that the water content in the insulating liquid is unevenly distributed.

[0034] S4, sampling the solution bottle 3 at least three times to obtain at least three groups of sampled liquids, each group of sampling has a different sampling point position, detecting the water content a of the sampled liquid, and calculating the average water content b of the insulating liquid.

[0035] When measuring the water content of the prepared insulating liquid, at least three samples are taken, and each group of sampling points is at a different position. The water content of the insulating liquid at different positions in the solution bottle 3 can be measured separately to ensure that the water content of the insulating liquid at different positions in the solution bottle 3 is similar, and to ensure that the water content of the insulating liquid is uniform.

[0036] In this embodiment, when detecting the water content of the sampled liquid, Karl Fischer coulometric titration is used for measurement.

[0037] S5, if ab≤±10ppm, the preparation of the insulating liquid is completed; if ab>±10ppm, the processing time of the ultrasonic water bath 2 is extended, and step S4 is repeated until ab≤±10ppm.

[0038] If the difference between the water content a of the sampled liquid and the average water content b of the insulating liquid is within 10ppm, the water content in the insulating liquid is relatively uniform, and subsequent experiments can be carried out. If ab>±10ppm, the water content in the insulating liquid is not uniformly distributed. The treatment time of the ultrasonic water bath 2 can be extended to continue mixing the water in the insulating liquid to ensure uniform water distribution.

[0039] The laboratory insulating liquid preparation method first dehydrates and degasses the insulating liquid when preparing the insulating liquid with the target water content, so that the water content of the insulating liquid after the treatment is less than or equal to 100 ppm. At this time, the initial water content in the insulating liquid is extremely small, which can reduce the influence of the initial water content of the insulating liquid on the prepared insulating liquid. The control system 5 controls the processing power and processing time of the ultrasonic water bath 2, and uses ultrasound to make water and the insulating liquid mix and collide at the molecular level. At the same time, the difference between the water content of each sampled liquid and the average water content is compared through multiple sampling to ensure that the water content of the insulating liquid is the same everywhere. Ultrasonic vibration can realize the rapid mixing of water and insulating liquid, which speeds up the efficiency and experimental process of preparing the insulating liquid with a specific water content in the laboratory.

[0040] In some embodiments, in step S1, the insulating liquid is placed in a vacuum oven, the working temperature and working time of the vacuum oven are set, and the water content c of the insulating liquid is detected after the vacuum oven finishes working, until c≤100ppm.

[0041] The insulating liquid is dehydrated and degassed by using a vacuum oven, which removes moisture from the insulating liquid by baking, and has high efficiency. In other embodiments, the insulating liquid may also be placed in a wind box, and hot air may be blown to the insulating liquid to perform dehydration and degassing.

[0042] In some embodiments, the operating temperature of the vacuum oven is 60° C., and the operating time is 48 hours.

[0043] At a temperature of 60° C., water vapor in the insulating liquid can be quickly removed, improving dehydration efficiency, while also ensuring the stability of the insulating liquid and preventing the insulating liquid from being damaged by excessive temperature. In other embodiments, the working time of the vacuum oven can be appropriately increased or decreased according to the quality of the insulating liquid.

[0044] In some embodiments, in step S3, the ultrasonic water bath 2 first operates at a first processing power for a first time, and then operates at a second processing power for a second time, and the ultrasonic water bath 2 is stopped for at least 10 minutes between the two operations.

[0045] The ultrasonic water bath 2 is shut down for at least 10 minutes between two operations to prevent the ultrasonic water bath 2 from running too long and causing a malfunction. In other embodiments, the downtime can be adjusted in a timely manner according to the working time of the ultrasonic water bath 2.

[0046] In some embodiments, the first processing power is the same as the second processing power, and the first time is greater than the second time.

[0047] The first processing power and the second processing power are the same, which can reduce the changes to the settings in the control system 5 and facilitate operation. When the ultrasonic water bath 2 is initially working, the internal temperature is low, so the first time can be greater than the second time, ensuring the stability of the ultrasonic water bath 2 while improving the processing efficiency.

[0048] In this embodiment, the first processing power and the second processing power are both 200W, the first time is 1 hour, and the second time is 50 minutes; in other embodiments, the specific values ​​of the first processing power, the second processing power, the first time and the second time can be adjusted as needed.

[0049] In some embodiments, in step S3, when the water vapor generator 1 introduces water vapor into the solution bottle 3 through the conduit 4, water vapor is first introduced at a first flow rate for a first time period, and then water vapor is introduced at a second flow rate for a second time period, and the first flow rate is greater than the second flow rate.

[0050] When water vapor is introduced into the solution bottle 3, the first flow rate is greater than the second flow rate, which can prevent the water vapor flow rate from being too high and causing uneven distribution of water in the insulating liquid. Initially, there is little water in the insulating liquid and the absorption rate is fast. When the water vapor is introduced for the first time, the first flow rate is large, so that the water can be quickly mixed into the insulating liquid. The second flow rate is small, so that the water in the insulating liquid can be uniform.

[0051] In this embodiment, the first flow rate is 0.5 L / min, the second flow rate is 0.3 L / min, and the first duration and the second duration are both 1 hour.

[0052] In some embodiments, in step S4, the heights of the sampling points of each group of samples are different.

[0053] After the water vapor enters the solution bottle 3, the insulating liquid in the upper layer of the solution bottle 3 has a larger contact area with the water, while the insulating liquid in the lower layer has a smaller contact area with the water. The uneven distribution of water is more reflected in the depth of the insulating liquid. When sampling the insulating liquid, the heights of the sampling points are different, which can more accurately determine whether the water content at different positions in the insulating liquid is uniform.

[0054] In some embodiments, in step S5, if ±10ppm≤ab≤±20ppm, the treatment time of the ultrasonic water bath 2 is extended by 30 minutes; if ±20ppm≤ab≤±30ppm, the treatment time of the ultrasonic water bath 2 is extended by 60 minutes; if ±30ppm≤ab≤±40ppm, the treatment time of the ultrasonic water bath 2 is extended by 90 minutes.

[0055] According to the difference between the water content of the sampled liquid and the average water content of the insulating liquid, the treatment time of the ultrasonic water bath 2 is appropriately extended, and sampling is performed after each extended tidal wave treatment, which can avoid the treatment time of the ultrasonic water bath 2 being too long and improve the preparation efficiency. In this embodiment, the power of the ultrasonic water bath 2 is 200W each time the ultrasonic water bath treatment time is extended.

[0056] A preferred embodiment of an insulating liquid preparation device of the present invention is as follows Figure 2 As shown, the insulating liquid preparation device includes a water vapor generator 1, an ultrasonic water bath 2, a solution bottle 3, a conduit 4 and a control system 5.

[0057] The water vapor generator 1 is used to stably generate water vapor, so that the water vapor can pass into the solution bottle 3 at a set flow rate and mix with the insulating liquid in the solution bottle 3. The water vapor generator 1 is provided with a knob, and the water vapor generation rate can be controlled by the knob, thereby adjusting the flow rate of the water vapor passing into the solution bottle 3.

[0058] The solution bottle 3 is placed in the ultrasonic water bath 2, and the solution bottle 3 is used to contain a sufficient amount of insulating liquid to meet the test requirements. In this embodiment, the solution bottle 3 is a glass bottle, and the glass bottle can be used for the operator to observe the change of the water level in the solution bottle 3. A rubber plug 6 is provided at the bottle mouth of the solution bottle 3, and the rubber plug 6 is used to seal the solution bottle 3 to keep the water content of the insulating liquid in the solution bottle 3 stable.

[0059] The rubber plug 6 has two pipe openings, one of which is connected to the water vapor generator 1 through the conduit 4, and the other is connected to the external environment through the conduit 4. After the water vapor enters the solution bottle 3 through the conduit 4, the water vapor that is not mixed with the insulating liquid can be discharged into the external environment in time, so as to avoid the pressure in the solution bottle 3 being too high, which may cause the solution bottle 3 to burst.

[0060] The conduit 4 is connected to a control valve 7, which can control the on-off state of the conduit 4. In this embodiment, the control valve 7 is a two-way valve, which is a ball valve. The on-off state of the conduit 4 can be changed by rotating the handle.

[0061] The control system 5 is electrically connected to the ultrasonic water bath 2, and the control system 5 is used to transmit power signals and time signals to the ultrasonic water bath 2. The control system 5 includes a display screen and a control button. The control knob is used for the operator to input the desired processing power and processing time, and the corresponding values ​​are displayed on the display screen, which is convenient for the operator to arrange subsequent experiments.

[0062] In some embodiments, the ultrasonic water bath 2 is further provided with a support net 8 and a drain port 9 , the solution bottle 3 is placed on the support net 8 , and the drain port 9 is located at the lower side of the support net 8 .

[0063] A support net 8 is provided in the ultrasonic water bath 2, and a drain port 9 is located at the lower side of the support net 8. The support net 8 can be used to place the solution bottle 3 to prevent the solution bottle 3 from shielding the drain port 9, so as to facilitate observation of water level changes, prevent the instrument from drying out, and fully oscillate the insulating liquid in the solution bottle 3. The drain port 9 is located at the lower side of the support net 8, and a drain valve 10 is connected to the drain port 9. After the experiment, the drain valve 10 can be opened to discharge the liquid to prevent the device from rusting.

[0064] In summary, the embodiments of the present invention provide a method and device for preparing an insulating liquid for laboratory use. When preparing an insulating liquid with a target water content, the insulating liquid is first dehydrated and degassed so that the water content of the insulating liquid after treatment is less than or equal to 100 ppm. At this time, the initial water content in the insulating liquid is extremely small, which can reduce the influence of the initial water content of the insulating liquid on the prepared insulating liquid. The control system controls the processing power and processing time of the ultrasonic water bath, and uses ultrasound to make water and the insulating liquid mix and collide at the molecular level. At the same time, the difference between the water content of each sampled liquid and the average water content is compared through multiple sampling to ensure that the water content of the insulating liquid is the same everywhere. Ultrasonic vibration can achieve rapid mixing of water and insulating liquid, which speeds up the efficiency and experimental process of preparing insulating liquid with a specific water content in the laboratory.

[0065] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing an insulating liquid for laboratory use, characterized in that: The following steps are involved: S1, first dehydrating and degassing the insulating liquid so that the water content of the insulating liquid after treatment is less than or equal to 100 ppm; S2, adding the insulating liquid treated in step S1 into a solution bottle, placing the solution bottle into an ultrasonic water bath, connecting the ultrasonic generator and the solution bottle with a catheter, connecting the ultrasonic water bath to a control system, and adding water into the ultrasonic water bath so that the water level of the ultrasonic water bath is higher than the insulating liquid level in the solution bottle; S3, setting the processing power and processing time of the ultrasonic water bath through the control system, starting the water vapor generator and the ultrasonic water bath, and the water vapor generated by the water vapor generator is introduced into the solution bottle through the conduit; S4, sampling the solution bottle at least three times to obtain at least three groups of sampled liquids, each group of sampling has a different sampling point position, detecting the water content a of each group of sampled liquids, and calculating the average water content b of the insulating liquid; S5, if ab≤±10ppm, the preparation of the insulating liquid is completed; if ab>±10ppm, the processing time of the ultrasonic water bath is extended, and step S4 is repeated until ab≤±10ppm.

2. The method for preparing laboratory insulating liquid according to claim 1, characterized in that: In step S1, the insulating liquid is placed in a vacuum oven, the working temperature and working time of the vacuum oven are set, and the water content c of the insulating liquid is detected after the vacuum oven finishes working, until c≤100ppm.

3. The method for preparing laboratory insulating liquid according to claim 2, characterized in that: The working temperature of the vacuum oven is 60°C and the working time is 48 hours.

4. The method for preparing an insulating liquid for laboratory use according to any one of claims 1 to 3, characterized in that: In step S3, the ultrasonic water bath first operates at the first processing power for a first time, and then operates at the second processing power for a second time, and the ultrasonic water bath is stopped for at least 10 minutes between the two operations.

5. The method for preparing laboratory insulating liquid according to claim 4, characterized in that: The first processing power is the same as the second processing power, and the first time is greater than the second time.

6. The method for preparing laboratory insulating liquid according to any one of claims 1 to 3, characterized in that: In step S3, when the water vapor generator introduces water vapor into the solution bottle through the conduit, water vapor is first introduced at a first flow rate for a first duration, and then water vapor is introduced at a second flow rate for a second duration, and the first flow rate is greater than the second flow rate.

7. The method for preparing laboratory insulating liquid according to any one of claims 1 to 3, characterized in that: In step S4, the heights of the sampling points of each group of samples are different.

8. The method for preparing laboratory insulating liquid according to any one of claims 1 to 3, characterized in that: In step S5, if ±10ppm≤ab≤±20ppm, the treatment time of the ultrasonic water bath is extended by 30 minutes; if ±20ppm≤ab≤±30ppm, the treatment time of the ultrasonic water bath is extended by 60 minutes; if ±30ppm≤ab≤±40ppm, the treatment time of the ultrasonic water bath is extended by 90 minutes.

9. An insulating liquid preparation device, using the laboratory insulating liquid preparation method according to any one of claims 1 to 8, characterized in that: The ultrasonic water bath comprises a water vapor generator, an ultrasonic water bath, a solution bottle, a conduit and a control system. The solution bottle is arranged in the ultrasonic water bath, the water vapor generator is connected with the solution bottle, the conduit is also connected with a control valve, the control system is electrically connected with the ultrasonic water bath, and the control system is used to transmit a power signal and a time signal to the ultrasonic water bath.

10. The insulating liquid preparation device according to claim 9, characterized in that: The ultrasonic water bath is also provided with a support net and a drain outlet, the solution bottle is placed on the support net, and the drain outlet is located at the lower side of the support net.

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