Insulating oil blank oil sample preparation device

Abstract

The utility model discloses an insulating oil blank oil sample preparation device, include: the container, the upper end of container forms and goes into the container and is located below the liquid level of insulating oil with one end of first pipeline is suitable for stretching, and one end of second pipeline is suitable for stretching into the container and is located above the liquid level of oil sample, the gas path control device is linked with first pipeline and second pipeline, in blowing mode, the gas path control device controls first pipeline and gas source intercommunication and second pipeline and atmosphere intercommunication, in stationary mode, the gas path control device closes first pipeline and second pipeline, in taking oil mode, the gas path control device controls second pipeline and gas source intercommunication and closes first pipeline. According to the insulating oil blank oil sample preparation device of the utility model, can make blank oil sample more convenient and easy to operate when preparing, make the cleanliness of the blank oil sample prepared get very good promotion, and when taking oil, more convenient and easy.

Description

Technical Field

[0001] This utility model relates to the field of power testing technology, and in particular to a device for preparing blank insulating oil samples. Background Technology

[0002] The determination of dissolved gas components in insulating oil is a core means of monitoring the condition of power equipment. By analyzing the content and changing trends of characteristic gases such as hydrogen, hydrocarbons, carbon monoxide, and carbon dioxide dissolved in the oil, early warning of latent faults (such as overheating and discharge) inside the equipment can be achieved. Blank oil samples of insulating oil are the basic samples in the process of determining the gas partition coefficient, as well as the basic samples for determining the detection limit, quantitation limit, and accuracy verification during method validation.

[0003] In related technologies, the preparation of blank oil samples for insulating oil involves multiple steps, including purging, settling, and oil sampling. This makes the adjustment of the gas path during the preparation of blank oil samples complex and inconvenient. During the preparation process, air can easily flow back into the container and contaminate the blank oil sample, resulting in poor cleanliness. Furthermore, the blank oil sample is difficult to remove from the container. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention provides an insulating oil blank sample preparation device. This device can easily switch gas paths to meet the needs of blank oil sample preparation, effectively preventing air backflow into the container, thus significantly improving the cleanliness of the prepared blank oil sample and making oil collection more convenient.

[0005] The insulating oil blank sample preparation device according to this utility model includes: a container for containing insulating oil, the container having an oil inlet at its upper end and an oil outlet at its lower end; a plug for sealing the oil inlet and having a first pipe and a second pipe inserted therethrough, one end of the first pipe being adapted to extend into the container and be below the liquid surface of the insulating oil, and one end of the second pipe being adapted to extend into the container and be above the liquid surface of the oil sample; and a fluid control component disposed at the oil outlet, the fluid control component being used to control... The system controls the opening and closing of the oil intake port; it also includes a gas path control device connected to the first pipeline and the second pipeline, which can switch between a blowing mode, a stationary mode, and an oil intake mode. In the blowing mode, the gas path control device connects the first pipeline to the gas source and the second pipeline to the atmosphere. In the stationary mode, the gas path control device closes the first pipeline and the second pipeline. In the oil intake mode, the gas path control device connects the second pipeline to the gas source and closes the first pipeline.

[0006] According to the insulating oil blank sample preparation device of this utility model, a gas path control device is set up. The gas path control device is connected to the first pipeline and the second pipeline and can be switched between the blowing mode, the standing mode and the oil sampling mode. In the blowing mode, the gas path control device controls the first pipeline to be connected to the gas source and the second pipeline to be connected to the atmosphere. In the standing mode, the first pipeline and the second pipeline are closed. In the oil sampling mode, the second pipeline is connected to the gas source and the first pipeline is closed. This allows the insulating oil blank sample preparation device to easily switch the gas path during the preparation of blank oil samples, making the blank oil sample preparation operation more convenient and easier. It also effectively prevents air from flowing back into the container during the standing and oil sampling processes, thus greatly improving the cleanliness of the prepared blank oil sample. When sampling the blank oil sample, nitrogen gas is introduced into the container, allowing the blank oil sample to flow out of the container more smoothly and stably, making the sampling of the insulating oil blank sample preparation device more convenient and easier.

[0007] In some embodiments of this utility model, the gas path control device includes: a first control valve, which has a first interface, a second interface, a third interface, and a fourth interface. The first interface is connected to the gas source, the second interface is connected to the atmosphere, the third interface is connected to the first pipeline, and the fourth interface is connected to the second pipeline. In the blowing mode, the first interface and the third interface are connected, and the second interface and the fourth interface are connected. In the stationary mode, the first interface, the second interface, the third interface, and the fourth interface are all disconnected. In the oil extraction mode, the first interface and the fourth interface are connected, and the second interface and the third interface are connected. A second control valve is connected in series with the first pipeline and is configured to close the first pipeline in the oil extraction mode.

[0008] In one embodiment of this utility model, the first control valve is a three-position four-way solenoid valve, the second control valve is a two-position two-way solenoid valve, and the first control valve and the second control valve are electrically connected.

[0009] In one embodiment of this utility model, the first pipeline includes: a first connecting pipe and an air inlet pipe, the air inlet pipe extending into the container in a vertical direction, the first connecting pipe being connected to the first interface and the air inlet pipe, and the second control valve being connected in series with the first connecting pipe.

[0010] In one embodiment of the present invention, the second pipeline includes a second connecting pipe and an outlet pipe, the outlet pipe extending into the container, and the second connecting pipe connected to the second interface and the outlet pipe.

[0011] In some embodiments of this utility model, one end of the first pipe extending into the container is provided with a porous sintered body.

[0012] In some embodiments of this utility model, the fluid control component is a valve.

[0013] In some embodiments of this invention, the fluid control component is a peristaltic pump.

[0014] In some embodiments of this utility model, the insulating oil blank sample preparation device further includes: a gas supply pipeline and a mass flow controller, wherein the gas supply pipeline is connected to the gas source and the gas path control device, and the mass flow controller is located in the gas supply pipeline.

[0015] In one embodiment of this utility model, the insulating oil blank sample preparation device further includes a display screen, and the mass flow controller is electrically connected to the display screen.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a container and fluid control components according to an embodiment of the present utility model; Figure 2 This is a schematic diagram showing the connection between the gas path control device and the gas source, etc., according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the insulating oil blank sample preparation device according to an embodiment of the present invention in the air blowing mode; Figure 4 This is a schematic diagram of the insulating oil blank sample preparation device according to an embodiment of the present invention in the static mode; Figure 5 This is a schematic diagram of the insulating oil blank sample preparation device according to an embodiment of the present invention in oil sampling mode; Figure 6 This is a schematic diagram of the airflow in the blowing mode of the first control valve according to an embodiment of the present utility model; Figure 7 This is a schematic diagram of the airflow in the static mode of the first control valve according to an embodiment of the present utility model; Figure 8 This is a schematic diagram of the airflow in the oil extraction mode of the first control valve according to an embodiment of the present invention.

[0018] Figure label: 10. Container; 11. Oil inlet; 12. Oil outlet; 20. Gas circuit control device; 21. First control valve; 211. First port; 212. Second port; 213. Third port; 214. Fourth port; 22. Second control valve; 30. First pipeline; 31. First connecting pipe; 32. Air inlet pipe; 321. Porous sintered body; 40. Second pipeline; 41. Second connecting pipe; 42. Gas outlet pipe; 50. Fluid control components; 60. Mass flow controller; 70. Gas source; 80. Gas pipeline; 90. Oil drain pipe; 100. Insulating oil blank sample preparation device. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0020] The following is for reference. Figures 1-8 Description of an insulating oil blank sample preparation apparatus 100 according to an embodiment of the present invention.

[0021] like Figures 1-8 As shown, the insulating oil blank sample preparation device 100 according to an embodiment of the present invention includes: a container 10, a plug, a fluid control component 50, and a gas path control device 20.

[0022] Specifically, container 10 is used to contain insulating oil, and the upper end of container 10 (refer to...) Figure 1 An oil inlet 11 is formed at the bottom of the container 10 (shown in the vertical direction), and an oil outlet 12 is formed at the bottom of the container 10. A plug seals the oil inlet 11 and is connected to a first pipe 30 and a second pipe 40. One end of the first pipe 30 is adapted to extend into the container 10 and is below the surface of the insulating oil, while one end of the second pipe 40 is adapted to extend into the container 10 and is above the surface of the oil sample. A fluid control element 50 is located at the oil outlet 12 and is used to control the opening and closing of the oil outlet 12. A gas path control device is also provided. The device 20 is connected to the first pipeline 30 and the second pipeline 40. The gas path control device 20 can switch between the blowing mode, the standing mode and the oil extraction mode. In the blowing mode, the gas path control device 20 controls the first pipeline 30 to be connected to the gas source 70 and the second pipeline 40 to be connected to the atmosphere. In the standing mode, the gas path control device 20 closes the first pipeline 30 and the second pipeline 40. In the oil extraction mode, the gas path control device 20 controls the second pipeline 40 to be connected to the gas source 70 and closes the first pipeline 30.

[0023] In this embodiment, a container 10 is provided. The container 10 is used to contain insulating oil and has an oil inlet 11 at the upper end and an oil outlet 12 at the lower end. The structure is simple. During preparation, the oil outlet 12 at the lower end is closed by the fluid control component 50. The insulating oil is introduced into the container 10 from the oil inlet 11. The plug then seals the oil inlet 11, so that the container 10 is connected to the outside atmosphere only through the second pipeline 40.

[0024] The first pipe 30 extends into the container 10 at one end, below the surface of the insulating oil, while the second pipe 40 extends into the container 10 at one end, above the surface of the insulating oil. The arrangement is reasonable. The gas path control device 20 is connected to the first pipe 30 and the second pipe 40, which can conveniently control the fluid flow in the first pipe 30 and the second pipe 40.

[0025] In this embodiment, the gas path control device 20 can be switched between blowing mode, static mode and oil sampling mode. In blowing mode, the gas path control device 20 controls the first pipeline 30 to be connected to the gas source 70 and the second pipeline 40 to be connected to the atmosphere. For example, the gas source 70 provides nitrogen. Under the control of the gas path control device 20, the nitrogen flows to the first pipeline 30 and flows into the insulating oil along the first pipeline 30, thereby bubbling and purging the insulating oil. After purging, the gas overflowing from the insulating oil is discharged into the atmosphere through the second pipeline 40 and the gas path control device 20, thereby well meeting the purging needs of the insulating oil.

[0026] When the gas path control device 20 is in the static mode, it closes the first pipeline 30 and the second pipeline 40. That is, the gas path control device 20 disconnects the first pipeline 30 from the gas source 70 and disconnects the second pipeline 40 from the atmosphere. At this time, the container 10 is in a sealed state, which allows the purged insulating oil to stand stably in the container 10, effectively preventing external air from flowing back into the container 10, thereby greatly improving the cleanliness of the prepared blank oil sample.

[0027] When the gas path control device 20 is in oil extraction mode, it controls the second pipeline 40 to connect with the gas source 70 and closes the first pipeline 30. For example, at this time, the fluid control component 50 opens the oil extraction port 12 accordingly. At this time, the gas source 70 can introduce nitrogen into the container 10 through the gas path control device 20 and the second pipeline 40, which increases the gas pressure in the container 10. This allows the blank oil sample to flow out more smoothly and reliably from the oil extraction port 12 under the push of the gas pressure to achieve oil extraction. The first pipeline 30 is closed by the gas path control device 20, which can prevent the blank oil sample from flowing back along the first pipeline 30 and contaminating the gas path control device 20. It can also effectively prevent the air from flowing back into the container 10 and contaminating the blank oil sample when the second pipeline 40 is connected to the atmosphere, so that the blank oil sample maintains its original cleanliness during the oil extraction process, thereby greatly improving the cleanliness of the prepared blank oil sample.

[0028] In this embodiment, the fluid control component 50 can be a control valve or a pump assembly with a shut-off function. For example, the fluid control component 50 can be a shut-off valve, or the fluid control component 50 can be a drive pump assembly. The drive pump assembly is equipped with a drive pump and shut-off valves at its inlet and outlet. Alternatively, the fluid control component 50 can be a peristaltic pump with a pipeline sealing function. The fluid control component 50 can be flexibly configured as needed to meet the sealing and opening requirements of the oil inlet 12.

[0029] Understandably, in related technologies, when taking blank oil samples, since the container 10 is in a relatively closed space with only the vent pipe 42 connected to the atmosphere, negative pressure is likely to occur inside the container 10 when the blank oil sample flows out from the oil extraction port 12. This causes the flow rate of the blank oil sample from the oil extraction port 12 to be too small or even unable to flow out. In addition, air will flow back into the container 10 from the vent pipe 42. Or, when the stopper is opened to take oil, external air will enter the container 10 from the oil inlet 11. This not only makes it inconvenient to take blank oil samples and easy to cause contamination, but also makes the operation of taking oil samples cumbersome and inconvenient.

[0030] In this embodiment, a gas path control device 20 is provided. During the preparation of the blank oil sample, when nitrogen needs to be introduced into the container 10 for purging, the gas path control device 20 switches to the purging mode, which allows the gas source 70 to deliver nitrogen into the container 10 to purge the insulating oil cake and discharge it to the atmosphere through the second pipeline 40. When the purged insulating oil in the container 10 needs to be left to stand, the gas path control device 20 switches to the standing mode, keeping the container 10 in a sealed state and effectively preventing air backflow from contaminating the blank oil sample. When the prepared blank oil sample needs to be removed, the gas path control device 20 switches to the oil extraction mode, and the gas source 70 delivers nitrogen into the container 10 through the second pipeline 40, preventing air backflow into the container 10 and increasing the air pressure inside the container 10, making it easier for the blank oil sample to flow out from the oil extraction port 12, thus making oil extraction more convenient and easier.

[0031] According to the insulating oil blank sample preparation device 100 of this utility model embodiment, an air path control device 20 is provided. The air path control device 20 is connected to the first pipeline 30 and the second pipeline 40 and can be switched between a blowing mode, a standing mode, and an oil sampling mode. In the blowing mode, the air path control device 20 controls the first pipeline 30 to be connected to the air source 70 and the second pipeline 40 to be connected to the atmosphere. In the standing mode, the first pipeline 30 and the second pipeline 40 are closed. In the oil sampling mode, the second pipeline 40 is connected to the air source 70 and the first pipeline 30 is closed, so that the insulating oil blank sample preparation device 100 can be prepared. The blank oil sample preparation device 100 can conveniently switch the gas path through the gas path control device 20 during the preparation of the blank oil sample, making the preparation of the blank oil sample more convenient and easier. It also effectively prevents air from flowing back into the container 10 during the standing and oil collection process of the blank oil sample, thus greatly improving the cleanliness of the prepared blank oil sample. When collecting the blank oil sample, nitrogen gas is introduced into the container 10, which allows the blank oil sample to flow out of the container 10 more smoothly and stably, making the oil collection of the blank oil sample preparation device 100 more convenient and easier.

[0032] In some embodiments of this utility model, such as Figure 2 and Figure 3 As shown, the gas path control device 20 may include: a first control valve 21 and a second control valve 22. The first control valve 21 has a first interface 211, a second interface 212, a third interface 213, and a fourth interface 214. The first interface 211 is connected to the gas source 70, the second interface 212 is open to the atmosphere, the third interface 213 is connected to the first pipeline 30, and the fourth interface 214 is connected to the second pipeline 40. In the blowing mode, the first interface 211 and the third interface 213 are connected, and the second interface 212 and the fourth interface 214 are connected. In the stationary mode, the first interface 211, the second interface 212, the third interface 213, and the fourth interface 214 are all disconnected. In the oil extraction mode, the first interface 211 and the fourth interface 214 are connected, and the second interface 212 and the third interface 213 are connected. The second control valve 22 is connected in series with the first pipeline 30 and is configured to close the first pipeline 30 in the oil extraction mode.

[0033] In this embodiment, the gas path control device 20 includes a first control valve 21. The first control valve 21 is provided with a first interface 211 connected to the gas source 70, a second interface 212 connected to the atmosphere, a third interface 213 connected to the first pipeline 30, and a fourth interface 214 connected to the second pipeline 40. For example, the first control valve 21 may include a valve body and a valve core. The valve body has the first interface 211, the second interface 212, the third interface 213, and the fourth interface 214. The valve core is located in the valve body. The valve core can be moved to switch the opening and closing of each interface in coordination with the valve body.

[0034] In blowing mode, refer to Figure 3 and Figure 6 The first interface 211 is connected to the third interface 213, and the second interface 212 is connected to the fourth interface 214, so that the gas source 70 can be connected to the first pipeline 30 and the atmosphere can be connected to the second pipeline 40. This allows nitrogen to flow from the first interface 211 to the third interface 213 and into the container 10 along the first pipeline 30. The gas in the container 10 can flow from the fourth interface 214 to the second interface 212 along the second pipeline 40 and then be discharged into the atmosphere.

[0035] In static mode, refer to Figure 4 and Figure 7 The first interface 211, the second interface 212, the third interface 213 and the fourth interface 214 are all disconnected, so that the first pipeline 30 and the second pipeline 40 are both in a closed state, thereby cooperating with the fluid control component 50 to seal the oil sampling port 12, so that the blank oil sample in the container 10 is in a closed space.

[0036] When using the oil extraction mode, refer to... Figure 5 and Figure 8 The first interface 211 is connected to the fourth interface 214, and the second interface 212 is connected to the third interface 213. Nitrogen can flow from the first interface 211 to the fourth interface 214 and then into the container 10 through the second pipeline 40. The fluid control component 50 opens the oil sampling port 12, allowing the blank oil sample to flow out smoothly. Since the second interface 212 is connected to the third interface 213, air in the atmosphere will flow along the second interface 212 and through the third interface 213 to the first pipeline 30, and then flow into the container 10 to contaminate the blank oil sample. In this embodiment, the second control valve 22 is set to close the first pipeline 30 in the oil sampling mode, effectively preventing external air from entering the container 10, thereby further ensuring the cleanliness of the blank oil sample, and making the blank oil sample flow out more stably and reliably from the oil sampling port 12 under the pressure of the introduced nitrogen, making it more convenient to sample the blank oil sample.

[0037] In one embodiment of this utility model, the first control valve 21 can be a three-position four-way solenoid valve, and the second control valve 22 can be a two-position two-way solenoid valve. The first control valve 21 and the second control valve 22 are electrically connected.

[0038] In this embodiment, the first control valve 21 is set as a three-position four-way solenoid valve, which can well meet the needs of pneumatic circuit control and avoid manual operation, making the pneumatic circuit control more efficient and convenient. The second control valve 22 is set as a two-position two-way solenoid valve, which can well meet the on / off control needs of the first pipeline 30. The first control valve 21 and the second control valve 22 are electrically connected, which can make the cooperation between the first control valve 21 and the second control valve 22 more stable and efficient. As a result, the insulating oil blank sample preparation device 100 requires less manual operation during the preparation of insulating oil, and the switching control of the pneumatic circuit is more stable, reliable and efficient, making the preparation of blank oil samples more convenient and easier to operate.

[0039] For example, refer to Figure 2 As shown, a three-position four-way solenoid valve can be of type M. A three-position four-way valve can include a valve body, a valve core, and two solenoid coils. The two solenoid coils can be arranged on both sides of the valve body. The valve core is located within the valve body in the left, center, and right positions (see reference). Figure 2 The valve core can move between the left and right directions (as shown). When the valve core is in the middle position, the air circuit control device 20 is in the stationary mode. When the valve core is in the right position, the air circuit control device 20 is in the blowing mode. When the valve core is in the left position, the air circuit control device 20 is in the oil-taking mode. The position of the valve core in the valve body can be controlled by switching the two coils on and off. For example, when the three-position four-way solenoid valve needs to be switched to the stationary mode, both solenoid coils are de-energized, so that the valve core is in the middle position. At this time, all four ports are disconnected. When the three-position four-way solenoid valve is switched to the blowing mode, one solenoid coil is energized and the other is de-energized, so that the valve core can move to the right position under the attraction of the solenoid coil. When the three-position four-way solenoid valve is switched to the oil-taking mode, the on and off states of the two solenoid coils are reversed.

[0040] In this embodiment, the two-position two-way solenoid valve can be equipped with an electromagnetic coil to control the opening and closing of the valve. The electromagnetic coil can be electrically connected to the electromagnetic coil of the three-position four-way solenoid valve that controls the valve core to move to the right position. When the air circuit control device 20 switches to the oil extraction mode, the electromagnetic coil of the three-position four-way solenoid valve is de-energized to move the valve core to the left position, and the electromagnetic coil of the two-position two-way solenoid valve can be simultaneously de-energized to close the first pipeline 30. When the air circuit control device 20 switches to the air blowing mode, the electromagnetic coil of the three-position four-way valve is energized to move the valve core to the right position, and the electromagnetic coil of the two-position two-way solenoid valve is energized to open the first pipeline 30. This allows the three-position four-way solenoid valve and the two-position two-way solenoid valve to be interlocked, making the control of the two-position two-way solenoid valve more efficient and accurate, and making the air circuit control device 20's control of the air circuit switching more stable and reliable.

[0041] In one embodiment of this utility model, such as Figure 3As shown, the first pipeline 30 may include: a first connecting pipe 31 and an air inlet pipe 32. The air inlet pipe 32 extends into the container 10 in the vertical direction. The first connecting pipe 31 is connected to the first interface 211 and the air inlet pipe 32. The second control valve 22 is connected in series with the first connecting pipe 31.

[0042] In this embodiment, the first pipeline 30 is provided with a first connecting pipe 31 and an air inlet pipe 32. The structure is simple and facilitates the connection between the gas path control device 20 and the container 10. This makes it easier to assemble the gas path control device 20, the container 10, and the first pipeline 30. For example, the air inlet pipe 32 is a glass tube and can be integrated into the plug. After the plug and the container 10 are assembled, the first connecting pipe 31 can be easily connected and assembled with the gas path control device 20 and the container 10 outside the container 10. The second control valve 22 is connected in series with the first connecting pipe 31, which is a reasonable arrangement.

[0043] In one embodiment of this utility model, such as Figure 3 As shown, the second pipeline 40 may include a second connecting pipe 41 and an outlet pipe 42, the outlet pipe 42 extending into the container 10, and the second connecting pipe 41 connected to the second interface 212 and the outlet pipe 42.

[0044] In this embodiment, the first pipeline 30 is provided with a second connecting pipe 41 and an outlet pipe 42, which has a simple structure and facilitates the connection between the gas path control device 20 and the container 10. This makes it easier to assemble the gas path control device 20, the container 10, and the first pipeline 30. For example, the outlet pipe 42 is a glass tube and can be integrated into the plug. After the plug and the container 10 are assembled, the second connecting pipe 41 can be easily connected and assembled with the gas path control device 20 and the container 10 outside the container 10. The second control valve 22 is connected in series with the second connecting pipe 41, which is a reasonable arrangement.

[0045] In some embodiments of this utility model, such as Figure 1 As shown, the end of the first pipe 30 that extends into the container 10 may be provided with a porous sintered body 321.

[0046] In this embodiment, a porous sintered body 321 is provided at one end of the first pipe 30 that extends into the container 10. Nitrogen gas can be dispersed into a large number of microbubbles through the porous sintered body 321 and enter the insulating oil, making the distribution of nitrogen gas in the insulating oil more uniform and the contact more sufficient. This results in a better and more efficient purging effect of nitrogen gas on the insulating oil, and makes the preparation of blank oil samples more efficient. Optionally, the porous sintered body 321 can be a microporous sintered plate.

[0047] In some embodiments of this utility model, the fluid control component 50 is a valve.

[0048] In this embodiment, the fluid control component 50 is set as a valve, which has a simple structure and can well meet the opening and closing requirements of the oil inlet 12. For example, the fluid control component 50 can be a shut-off valve, ball valve, solenoid valve, etc., as long as it meets the usage requirements.

[0049] In some embodiments of this utility model, the fluid control component 50 is a peristaltic pump.

[0050] In this embodiment, the fluid control component 50 is set as a peristaltic pump. The peristaltic pump works by mechanically squeezing the hose to deliver the liquid. When the peristaltic pump stops operating, the hose is closed under the squeezing action of the peristaltic pump, thus meeting the opening and closing requirements of the oil outlet 12. Furthermore, the peristaltic pump provides the driving force for the blank oil sample to flow out of the container 10, making it easier for the blank oil sample to flow out of the oil outlet 12, thereby making it more convenient for the insulating oil blank sample preparation device 100 to collect oil. For example, the insulating oil blank sample preparation device 100 can be equipped with an oil drain pipe 90, which is a flexible hose connected to the oil outlet 12 of the container 10. The peristaltic pump can be installed on the oil drain pipe 90.

[0051] In some embodiments of this utility model, such as Figure 3 As shown, the insulating oil blank sample preparation device 100 may further include: a gas supply pipeline 80 and a mass flow controller 60. The gas supply pipeline 80 is connected to the gas source 70 and the gas path control device 20, and the mass flow controller 60 is located in the gas supply pipeline 80.

[0052] In this embodiment, a gas supply pipeline 80 is provided, which is connected to the gas source 70 and the gas path control device 20 to meet the needs of nitrogen supply. Specifically, the gas supply pipeline 80 is connected to the first interface 211 of the first control valve 21.

[0053] In this embodiment, the mass flow controller 60 is installed in the gas supply pipeline 80, which is reasonably arranged. The mass flow controller 60 can detect the mass flow rate of nitrogen gas supplied from the gas source 70 to the container 10 and control and adjust the mass flow rate so that the flow rate of nitrogen gas into the container 10 can be kept stable through the adjustment of the mass flow controller 60. The mass flow controller 60 can be electrically connected to the gas path control device 20 so that the mass flow controller 60 can automatically adjust the nitrogen supply according to the operating status of the gas path control device 20. This allows the insulating oil blank sample preparation device 100 to more accurately control the nitrogen gas supply when preparing blank oil, making the entire blank oil sample preparation process more controllable.

[0054] In one embodiment of this invention, the insulating oil blank sample preparation device 100 further includes a display screen, and the mass flow controller 60 is electrically connected to the display screen. This allows the nitrogen delivery status to be visually monitored on the display screen during the blank sample preparation process, making it more convenient to use.

[0055] The following will refer to Figures 1-8 Description of an insulating oil blank sample preparation apparatus 100 according to a specific embodiment of the present invention.

[0056] like Figures 1-8 As shown, the insulating oil blank sample preparation device 100 includes a container 10, a plug, a first pipeline 30, a second pipeline 40, a gas source 70, a gas delivery pipeline 80, a mass flow controller 60, a gas path control device 20, a fluid control component 50, and an oil discharge pipe 90.

[0057] Container 10 is a gas washing bottle. The upper end of container 10 forms an oil inlet 11, and the lower end forms an oil outlet 12. A plug seals the oil inlet 11. The oil outlet 12 is connected to the oil drain pipe 90, which can be an anti-static polyurethane hose. The oil drain pipe 90 can be fixed to the oil outlet 12 using double clamps. The fluid control component 50 is a peristaltic pump, located on the oil drain pipe 90. The peristaltic pump has a pump head pressure of 0.32 MPa and a rotation speed of 208 rpm. The inner diameter of the oil drain pipe 90 is 3.2 mm, and the outer diameter is 6.4 mm. The gas washing bottle is a normal temperature and pressure gas saturator with a capacity of 500 ml.

[0058] The pneumatic control device 20 is a cuboid with a length of 400mm, a width of 300mm, and a height of 300mm. It includes a first control valve 21 and a second control valve 22. The first control valve 21 is a three-position four-way solenoid valve of type M, and the second control valve 22 is a two-position two-way solenoid valve with single-electric control and normally closed operation. The nominal diameter of both the three-position four-way solenoid valve and the two-position two-way solenoid valve is 8mm, the interface is 1 / 8 inch, and the voltage of the solenoid coil is 220 volts AC. The first control valve 21 and the second control valve 22 are electrically connected.

[0059] The first control valve 21 is provided with a first interface 211, a second interface 212, a third interface 213, and a fourth interface 214. The first pipeline 30 includes a connected first connecting pipe 31 and an air inlet pipe 32. The second pipeline 40 includes a connected second connecting pipe 41 and an air outlet pipe 42. The air inlet pipe 32 and the air outlet pipe 42 are integrated on the plug body. The air inlet pipe 32 extends into the container 10 to below the insulating oil surface, and the air outlet pipe 42 extends into the container 10 and is located above the insulating oil surface. One end of the air inlet pipe 32 extending into the container 10 is provided with a microporous sintered plate. The second control valve 22 is provided on the first connecting pipe 31. The first connecting pipe 31 is connected to the third interface 213, and the second connecting pipe 41 is connected to the fourth interface 214. For example, the first connecting pipe 31 and the second connecting pipe 41 can be antistatic polyurethane hoses. The first connecting pipe 31, the third interface 213, and the air inlet pipe 32 can be fixed by double clamps, and the second connecting pipe 41, the fourth interface 214, and the air outlet pipe 42 can be fixed by double clamps. The gas supply line 80 is connected to the gas source 70 and the first interface 211. For example, the gas supply line 80 and the gas source 70 can be connected by a pagoda connector. The mass flow controller 60 has a length of 70mm, a width of 70mm, and a height of 30mm. It contains a miniature air pump and has a flow range of 0~300mL / min. The mass flow controller 60 is located on the gas supply line 80 and is electrically connected to the gas path control device 20. The mass flow controller 60 is connected to an external display screen, which can display the flow rate.

[0060] In this embodiment, the gas path control device 20 can switch between a blowing mode, a static mode, and an oil extraction mode. In the blowing mode, nitrogen flows along the gas supply pipeline 80 from the first port 211 to the third port 213, thereby flowing from the first pipeline 30 into the insulating oil in the container 10. At this time, the peristaltic pump is in a stopped state, and the second control valve 22 is in an open state. The gas in the container 10 flows along the second pipeline 40 from the fourth port 214 to the second port 212 and is then discharged to the atmosphere. In the static mode, the first port 211, the second port 212, and the third port 21 of the first control valve 21 are connected. When both the first and fourth interfaces 211 and 214 are disconnected, the second control valve 22 is closed, the peristaltic pump remains stopped, and the air inlet pipe 32, air outlet pipe 42, and oil drain pipe 90 are all closed, forming a sealed space inside the container 10. In the oil extraction mode, the first interface 211 and the fourth interface 214 are connected, and the second interface 212 and the third interface 213 are connected. Nitrogen flows from the first interface 211 to the fourth interface 214 along the gas delivery pipeline 80 and flows into the container 10 through the second pipeline 40. The second control valve 22 remains closed, disconnecting the first pipeline 30 from the atmosphere, and the peristaltic pump operates to discharge oil.

[0061] In this embodiment, the gas path switching for purging, settling, and oil sampling is achieved through the mode switching of the gas path control device 20. This effectively saves the assembly and adjustment time of the insulating oil blank sample preparation device 100 during the preparation process and simplifies the purging and oil sampling operation. In the purging mode, the gas path control device 20 controls the first pipeline 30 to be connected to the gas source 70 and the second pipeline 40 to be connected to the atmosphere. In the settling mode, the first pipeline 30 and the second pipeline 40 are closed. In the oil sampling mode, the second pipeline 40 is connected to the gas source 70 and the first pipeline 30 is closed, thus ensuring the insulating oil blank sample preparation device 100 can operate smoothly. The insulating oil blank sample preparation device 100 allows for convenient switching of the gas path via the gas path control device 20 during the blank oil sample preparation process, making the preparation of the blank oil sample more convenient and easier. Furthermore, it effectively prevents air backflow into the container 10 during the settling and oil collection processes, significantly improving the cleanliness of the prepared blank oil sample. When collecting the blank oil sample, nitrogen gas is introduced into the container 10, allowing the blank oil sample to flow out of the container 10 more smoothly and stably, thus making the oil collection process of the insulating oil blank sample preparation device 100 more convenient and easier. This embodiment of the insulating oil blank sample preparation device 100 provides a suitable apparatus for preparing blank oil samples before determining the gas distribution coefficient of insulating oil through a convenient and efficient preparation process.

[0062] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 this utility model.

[0063] Furthermore, the terms "first" and "second" 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" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0064] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," 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, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0065] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0066] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An apparatus for preparing blank insulating oil samples, characterized in that, include: A container (10) is used to hold insulating oil. An oil inlet (11) is formed at the upper end of the container (10), and an oil outlet (12) is formed at the lower end of the container (10). A plug body, the plug body sealing the oil inlet (11) and having a first pipe (30) and a second pipe (40) inserted through it, one end of the first pipe (30) being adapted to extend into the container (10) and being below the liquid surface of the insulating oil, and one end of the second pipe (40) being adapted to extend into the container (10) and being above the liquid surface of the oil sample; A fluid control component (50) is provided at the oil inlet (12) and is used to control the opening and closing of the oil inlet (12); A gas path control device (20) is connected to the first pipeline (30) and the second pipeline (40). The gas path control device (20) can switch between a blowing mode, a stationary mode and an oil extraction mode. In the blowing mode, the gas path control device (20) controls the first pipeline (30) to be connected to the gas source (70) and the second pipeline (40) to be connected to the atmosphere. In the stationary mode, the gas path control device (20) closes the first pipeline (30) and the second pipeline (40). In the oil extraction mode, the gas path control device (20) controls the second pipeline (40) to be connected to the gas source (70) and closes the first pipeline (30).

2. The insulating oil blank sample preparation device according to claim 1, characterized in that, The gas path control device (20) includes: A first control valve (21) is provided with a first interface (211), a second interface (212), a third interface (213), and a fourth interface (214). The first interface (211) is connected to the air source (70), the second interface (212) is connected to the atmosphere, the third interface (213) is connected to the first pipeline (30), and the fourth interface (214) is connected to the second pipeline (40). In the blowing mode, the first interface (211) and the third interface (213) are connected, and the second interface (212) and the fourth interface (214) are connected. In the static mode, the first interface (211), the second interface (212), the third interface (213), and the fourth interface (214) are all disconnected. In the oil extraction mode, the first interface (211) and the fourth interface (214) are connected, and the second interface (212) and the third interface (213) are connected. A second control valve (22) is connected in series with the first pipeline (30) and is configured to close the first pipeline (30) in the oil extraction mode.

3. The insulating oil blank sample preparation device according to claim 2, characterized in that, The first control valve (21) is a three-position four-way solenoid valve, and the second control valve (22) is a two-position two-way solenoid valve. The first control valve (21) and the second control valve (22) are electrically connected.

4. The insulating oil blank sample preparation device according to claim 2, characterized in that, The first pipeline (30) includes a first connecting pipe (31) and an air inlet pipe (32). The air inlet pipe (32) extends into the container (10) in the vertical direction. The first connecting pipe (31) is connected to the first interface (211) and the air inlet pipe (32). The second control valve (22) is connected in series with the first connecting pipe (31).

5. The insulating oil blank sample preparation device according to claim 2, characterized in that, The second pipeline (40) includes a second connecting pipe (41) and an outlet pipe (42), the outlet pipe (42) extending into the container (10), and the second connecting pipe (41) being connected to the second interface (212) and the outlet pipe (42).

6. The apparatus for preparing blank insulating oil samples according to claim 1, characterized in that, The first pipe (30) has a porous sintered body (321) at one end that extends into the container (10).

7. The insulating oil blank sample preparation device according to claim 1, characterized in that, The fluid control component (50) is a valve.

8. The apparatus for preparing blank insulating oil samples according to claim 1, characterized in that, The fluid control component (50) is a peristaltic pump.

9. The apparatus for preparing blank insulating oil samples according to claim 1, characterized in that, Also includes: A gas pipeline (80) and a mass flow controller (60) are provided. The gas pipeline (80) is connected to the gas source (70) and the gas path control device (20). The mass flow controller (60) is located on the gas pipeline (80).

10. The apparatus for preparing blank insulating oil samples according to claim 9, characterized in that, It also includes a display screen, to which the mass flow controller (60) is electrically connected.

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