Insulating oil live vacuum bubble-free oil filling monitoring system and oil filling and exhaust method thereof

Abstract

The present invention discloses an insulating oil live vacuum bubble-free oil replenishment monitoring system and an oil replenishment and exhaust method thereof, comprising an online oil replenishment machine and an oil replenishment tee, wherein the quick-connect outlet of the online oil replenishment machine is connected to the oil inlet pipe of the oil replenishment tee through an oil replenishment pipeline, the circulation return oil quick interface of the online oil replenishment machine is connected to one of the oil outlet pipes of the oil replenishment tee through an oil return pipeline, the other oil outlet pipe of the oil replenishment tee is connected to the oil replenishment valve of the oil insulation equipment, and a bubble monitoring device unit with both bubble monitoring and oil-gas separation functions is also connected between the online oil replenishment machine and the oil replenishment tee. On the one hand, the present invention ensures the safety of oil replenishment by designing a three-way joint that can perform a full exhaust operation, and on the other hand, adopts a solenoid valve to flexibly switch to realize the rapid emptying of redundant oil in the system pipeline after the oil replenishment operation is completed, and at the same time, a bubble detection unit is used to replace the naked eye to realize circulation monitoring and oil replenishment monitoring during the oil circulation process, and gas-liquid separation can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of insulating oil replenishment for oil-insulated equipment, and in particular to an insulating oil live vacuum bubble-free oil replenishment monitoring system and an oil replenishment and exhaust method thereof. Background Art

[0002] In electric power production, insulating oil is essential for the normal operation of electrical equipment. Over time, insulating oil may be depleted or contaminated for various reasons and needs to be replenished or replaced. During the oil replenishment process of electrical equipment, the impact of gas cannot be ignored. These impacts are mainly reflected in the following aspects:

[0003] First, gas may cause electrical failures. During the operation of oil-insulated equipment, if there is too much gas in the environment, especially insufficient oxygen or the presence of flammable gas, electrical failures such as short circuits and arcs may occur. This will not only affect the normal operation of the equipment, but may also pose a threat to personnel safety.

[0004] Secondly, gas may affect the performance of the oil. During the oil replenishment process, if gas mixes with the oil, it may change the physical and chemical properties of the oil, such as the viscosity and insulation properties of the oil. This may cause the performance of the oil to deteriorate and fail to effectively play the role of lubrication, cooling and insulation, thus affecting the operating efficiency and safety of the equipment.

[0005] Third, gas may also affect the accuracy and efficiency of the oil replenishment operation. During the oil replenishment process, if there is too much gas or gas flows, the oil level measurement may be inaccurate, resulting in insufficient or excessive oil replenishment. This will not only waste resources, but may also cause damage to the equipment.

[0006] In view of this, some devices and methods for removing gas during the oil replenishment process have appeared on the market, such as an EHA exhaust oil replenishment device and an exhaust oil replenishment method disclosed in CN202311031988.3, ​​which are used to exhaust the gas in the EHA system pipeline and replenish the hydraulic oil for the accumulator to reach the pre-charge pressure. When the EHA exhaust oil replenishment device is in use, it is installed between the EHA system balance valve and the electromagnetic on-off valve through a quick-connect connector. The gas in the EHA system pipeline is exhausted by the extension and retraction of the oil cylinder. When the oil cylinder is fully extended, the pressure of the overflow valve in the EHA system and the exhaust oil replenishment device is set to zero and the oil is continued to be supplied. The gas in the pipeline between the overflow valve and the oil tank is exhausted, and the accumulator is replenished with oil by rotating the exhaust oil replenishment device pump. The pressure gauge is used to monitor whether the oil replenishment is completed. After completion, the quick-connect connector is disconnected and the EHA exhaust oil replenishment device is taken away and reconnected to restore the EHA system to its original state.

[0007] However, although the above device can discharge the gas contained in the oil to a certain extent, the monitoring of the gas contained in the oil still remains at the stage of observing the bubbles with the naked eye. Since the small bubbles in the oil are difficult to observe when it flows, it is difficult to control the gas content of the added oil simply by naked eye observation, resulting in a greater safety risk in the operation of electrical equipment. In addition, after the oil filling work is completed, a large amount of oil still remains in the pipeline of the device. On the one hand, it is easy to overflow and pollute the environment and equipment during disassembly and assembly. On the other hand, these oils are easily affected by moisture and deterioration when they remain in the pipeline for a long time, affecting the quality of the next oil filling work. Summary of the invention

[0008] One of the objects of the present invention is to provide an insulating oil live vacuum bubble-free oil filling monitoring system. On the one hand, the oil filling safety is ensured by designing a three-way joint that can perform sufficient exhaust operations. On the other hand, the solenoid valve is flexibly switched to realize the rapid emptying of redundant oil in the system pipeline after the oil filling operation is completed. At the same time, during the oil circulation process, a bubble detection unit is used instead of the naked eye to realize circulation monitoring and oil filling monitoring, and gas-liquid separation can be achieved, which is beneficial to improving the oil filling accuracy and efficiency. Another object of the present invention is to provide an oil filling and exhaust method based on the aforementioned insulating oil live vacuum bubble-free oil filling monitoring system, aiming to solve the technical problems described in the background technology.

[0009] To achieve the above object, the present invention discloses a technical solution:

[0010] An insulating oil live vacuum bubble-free oil replenishment monitoring system, the key of which is: comprising an online oil replenishment machine and an oil replenishment tee (41), wherein the quick-connect outlet (1) of the online oil replenishment machine is connected to an oil inlet pipe (48) of the oil replenishment tee (41) through an oil replenishment pipeline, the circulating oil return quick interface (4) of the online oil replenishment machine is connected to one of the oil outlet pipes of the oil replenishment tee (41) through an oil return pipeline, the other oil outlet pipe of the oil replenishment tee (41) is connected to an oil replenishment valve (46) of an oil insulating device, and a bubble monitoring device unit having both bubble monitoring and oil-gas separation functions is also connected between the online oil replenishment machine and the oil replenishment tee (41);

[0011] Wherein: a connecting pipe (42) is installed in the oil outlet pipe of the oil replenishment tee (41) connected to the oil return pipeline through a sealing ring (40); an exhaust pipe (43) made of a plastically deformable material is connected to the inlet of the connecting pipe; the exhaust pipe (43) extends into the valve cavity of the oil replenishment valve (46) and abuts against the valve core (45) of the oil replenishment valve (46); and on the one hand, it is used to exhaust the air in the valve cavity of the oil replenishment valve (46); on the other hand, it is used to match the oil replenishment pipeline and the oil return pipeline to realize the oil circulation in the oil replenishment monitoring process.

[0012] Furthermore, the online oil replenishing machine is provided with a vacuum tank (10) with a vacuum pump (13), and its quick-connect outlet (1), quick-connect inlet (5) and circulating oil return quick interface (4) are respectively connected to the vacuum tank (10) through an oil circuit, and an oil pump (12) and an outlet solenoid valve (9) are provided on the connecting oil circuit between the quick-connect outlet (1) and the vacuum tank (10), an inlet solenoid valve (8) is provided on the connecting oil circuit between the quick-connect inlet (5) and the vacuum tank (10), and a circulating oil return solenoid valve (6) is provided on the connecting oil circuit between the circulating oil return quick interface (4) and the vacuum tank (10).

[0013] Furthermore, an emptying structure is also provided in the online oil replenishing machine, and the emptying structure is used to empty the oil in the system pipeline after the oil replenishing operation is completed for next use.

[0014] Furthermore, the exhaust structure includes an exhaust air inlet (2), and the exhaust air inlet (2) is connected to the quick-connect outlet (1), the quick-connect inlet (5), the circulating oil return quick interface (4), and the oil circuit connected to the vacuum tank (10) through an exhaust pipeline, and an exhaust solenoid valve (3), an exhaust solenoid valve A (7), and an exhaust solenoid valve B (11) are also connected to the exhaust pipeline. By switching the exhaust solenoid valve (3), the exhaust solenoid valve A (7), and the exhaust solenoid valve B (11), redundant oil in the system pipeline can be exhausted.

[0015] Furthermore, the oil replenishment pipeline includes an oil replenishment pipe A and an oil replenishment pipe B, wherein the oil replenishment pipe A is connected to the oil inlet pipe (48) of the oil replenishment tee (41) and the oil outlet (29) of the bubble monitoring device unit, and the oil replenishment pipe B is connected to the quick-connect outlet (1) of the online oil replenishment machine and the oil inlet (20) of the bubble monitoring device unit.

[0016] Furthermore, a multi-stage bubble separation and monitoring structure is connected between the oil inlet (20) and the oil outlet (29) of the bubble monitoring device unit.

[0017] Furthermore, the multi-stage bubble separation and monitoring structure comprises n stages of gas-liquid separation chambers arranged in sequence, the chamber space of each stage of the gas-liquid separation chamber is divided into an upper part and a lower part by a bubble separation sieve plate (22), the upper chamber of each stage of the gas-liquid separation chamber is connected to an upper pipeline with a bubble detector, and the upper pipeline is used to connect the upper chamber of the n-stage gas-liquid separation chamber in series between the oil inlet (20) and the oil outlet (29) of the bubble monitoring device unit, The diameter of the upper pipeline of the n-stage gas-liquid separation chamber decreases step by step, and the lower cavity of each stage of the gas-liquid separation chamber is also connected with a lower pipeline, and the lower pipeline is used to connect the upper cavity of the n-1-stage gas-liquid separation chamber and the lower cavity of the n-stage gas-liquid separation chamber in series between the oil inlet (20) and the oil outlet (29) of the bubble monitoring device unit, and the lower pipeline at the end is connected with a main pipe bubble detector (30); wherein: n≥2 and n is a positive integer.

[0018] Furthermore, a pipeline microporous sieve plate (21) is provided at the oil inlet (20) of the bubble monitoring device unit and in the lower pipeline between two adjacent gas-liquid separation chambers.

[0019] Furthermore, the gas-liquid separation chamber is provided with three levels in total, a first-level bubble detector (24) is correspondingly provided in the upper pipeline of the first-level gas-liquid separation chamber (23), a second-level bubble detector (26) is correspondingly provided in the upper pipeline of the second-level gas-liquid separation chamber (25), and a third-level bubble detector (28) is correspondingly provided in the upper pipeline of the third-level gas-liquid separation chamber (27).

[0020] Based on the above structure, the present invention also discloses an oil replenishment and exhaust method for an insulating oil live vacuum bubble-free oil replenishment monitoring system, the key of which is to include the following steps:

[0021] S1: connecting one of the oil outlet pipes of the oil supply tee (41) to the oil supply valve (46) of the oil insulation device, ensuring that the oil supply valve (46) of the oil insulation device is in a closed state, so that the exhaust pipe (43) extends into the valve cavity of the oil supply valve (46) and abuts against the valve core (45) of the oil supply valve (46);

[0022] S2: Use the oil return pipe to connect the interface (47) of the built-in connecting pipe (42) in the other oil outlet pipe of the oil replenishment tee (41) and the circulation oil return quick interface (4) of the online oil replenishment machine, the oil replenishment pipe A connects the oil inlet pipe (48) of the oil replenishment tee (41) and the oil outlet (29) of the bubble monitoring device unit, the oil replenishment pipe B connects the quick-connect outlet (1) of the online oil replenishment machine and the oil inlet (20) of the bubble monitoring device unit, and the oil storage tank connects the quick-connect inlet (5) of the online oil replenishment machine and the oil storage barrel;

[0023] S3: The system oil storage is circulated and exhausted, the bubble monitoring device unit selects the circulation monitoring mode, the vacuum pump (13) evacuates the vacuum tank (10), and when the pressure of the vacuum tank (10) drops to -60 kPa, the inlet solenoid valve (8) is controlled to open, and the oil enters the vacuum tank (10) through the quick-connect inlet (5). Under the action of the oil pump (12), the oil passes through the outlet solenoid valve (9), the quick-connect outlet (1), the oil replenishment pipe B, the oil inlet (20) of the bubble monitoring device unit, the oil outlet (29) of the bubble monitoring device unit, the oil inlet pipe (48), the exhaust pipe (43), the connecting pipe (42), the interface (47), the circulation oil return quick interface (4), the circulation oil return solenoid valve (6), and the vacuum tank (10) for circulation. When the oil circulates, bubbles in various parts of the system can be brought into the vacuum tank (10);

[0024] S4: If the pressure of the vacuum tank (10) rises to greater than -60 kPa, it is determined that the gas in the vacuum tank (10) increases, and the vacuum pump (13) is controlled to start, until the pressure in the vacuum tank (10) drops to less than -80 kPa, and the vacuum pump (13) is stopped;

[0025] S5: After the cycle monitoring reaches a predetermined number of times or / and a predetermined time, if the bubble monitoring device unit detects that the number of bubbles is less than or equal to a predetermined number threshold, the oil replenishment operation is started, the bubble monitoring device unit selects a cycle oil replenishment mode, opens the oil replenishment valve (46) of the oil insulation device, and then opens the online oil replenishment machine to start oil replenishment;

[0026] S6: If new bubbles are found in the pipeline during the oil replenishment monitoring process, that is, any of the first-stage bubble detector (24), the second-stage bubble detector (26), the third-stage bubble detector (28), and the main pipe bubble detector (30) detects new bubbles, the solenoid valve of the bubble monitoring device unit will be closed after the predetermined number threshold is met, and the pressure of the quick-connect outlet (1) of the online oil replenishment machine will increase. After reaching the preset alarm pressure threshold of the online oil replenishment machine, the online oil replenishment machine will be stopped, the oil replenishment valve (46) will be closed, the solenoid valve of the bubble monitoring device unit and the online oil replenishment machine will be opened, and the process will return to step S3 to start the circulation monitoring mode;

[0027] S7: After the oil replenishment operation is completed, the pipeline emptying operation is started. Under the negative pressure of the vacuum tank (10), air enters through the emptying air inlet (2) and the emptying solenoid valve (3), and then comes to the oil return pipe through the circulating oil return quick interface (4), and enters the inside of the oil replenishment tee (41) from the interface (47), and then comes out from the oil inlet pipe (48) of the oil replenishment tee (41), and then passes through the oil replenishment pipe A, the bubble detection device unit oil outlet (29), and the bubble detection device unit oil inlet (20) to the quick-connect outlet (1), passes through the solenoid valve A (7) and the inlet solenoid valve (8) to enter the vacuum tank (10), and finally the oil pump (12) sends the oil back to the oil storage barrel through the solenoid valve B (11), the quick-connect inlet (5), and the oil storage pipe, so as to complete the complete emptying of the redundant oil in the system pipeline.

[0028] Compared with the prior art, the present invention has the following remarkable effects:

[0029] (1) The present invention embeds an exhaust pipe made of plastically deformable material in the air supply tee, which can be pressed against the valve core position of the oil supply valve of the oil-insulated equipment, thereby removing the air in the valve cavity from the flange to the valve core section of the oil supply valve, so as to meet the needs of various application scenarios and ensure that the air is removed to the greatest extent before the circulation monitoring and oil supply monitoring are officially started, thereby preventing the air from being mixed into the oil during the circulation process to cause excessive bubbles, which is beneficial to reducing the operating burden of the bubble monitoring unit, ensuring the safety of oil supply and improving the efficiency of oil supply;

[0030] (2) By optimizing the pipeline design of the online oil filling machine and setting corresponding solenoid valves in each pipeline to achieve opening and closing, the redundant oil in the system pipeline is emptied by switching the opening and closing states of the solenoid valves after the oil filling operation is completed. The entire emptying process is realized based on the pipeline structure of the system under the circulation monitoring state, thereby avoiding the overflow of redundant oil during disassembly and assembly to pollute the environment and equipment, and also eliminating the risk of transporting retained deteriorated oil to the oil insulation equipment during the next oil filling operation;

[0031] (3) By setting a bubble monitoring device unit in the oil circulation pipeline, on the one hand, the gas contained in the oil can be separated, and on the other hand, the number and frequency of bubbles in the oil circulation process can be monitored, and various data can be automatically recorded. By comparing the various data with the preset parameters, functions such as alarm and shutting off the oil replenishment circuit can be realized, thereby forcing the online oil replenishment machine to increase the pressure and shut down;

[0032] (4) The bubble monitoring device unit adopts multi-stage bubble separation technology. The bubble detectors at each level work together to achieve step-by-step separation and accurate detection of bubbles, thereby improving the accuracy and reliability of bubble detection. At the same time, by adjusting the pipe diameters passing through the bubble detectors at each level, the accuracy requirements for monitoring bubbles of different sizes can be met to meet the needs of different oil products and refueling scenarios, thereby improving the flexibility and adaptability of refueling operations;

[0033] (5) The online oil filling machine is connected to each pipeline through a quick-connect interface, which is convenient for quick installation and disassembly, improving the efficiency of the oil filling operation; at the same time, the design of the quick-connect interface can also take into account the sealing requirements of the system to reduce the risk of oil leakage;

[0034] (6) The bubble monitoring unit controller of the oil replenishment machine built into the bubble monitoring unit can intelligently control the entire circulation monitoring and oil replenishment monitoring process. By comparing the monitoring data with the preset parameters, it automatically adjusts the oil flow rate, number of cycles and cycle time to ensure that the oil meets the oil replenishment requirements. At the same time, the controller can also record and store the oil replenishment process to facilitate subsequent data analysis and optimization. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0036] Figure 1 is a system schematic diagram of Embodiment 1;

[0037] Figure 2 Schematic diagram of the structure of the vertical oil replenishment tee in the first embodiment;

[0038] Figure 3 2 is a schematic diagram of the structure of the horizontal oil supply tee in the first embodiment;

[0039] Figure 4 This is a schematic diagram of the structure of the internal pipeline of the online oil replenishing machine of the first embodiment;

[0040] Figure 5 is a structural schematic diagram of a multiple bubble separation and monitoring structure of Example 1;

[0041] Markings in the figure: 40-seal ring, 41-oil supply tee, 42-connecting pipe, 43-exhaust pipe, 44-oil insulation equipment oil supply pipe, 45-oil insulation equipment oil supply valve core, 46-oil insulation equipment oil supply valve, 47-connecting pipe interface, 48-oil inlet pipe;

[0042] 1-quick-connect outlet, 2-exhaust inlet, 3-exhaust solenoid valve, 4-oil return quick connector, 5-quick-connect inlet, 6-oil return solenoid valve, 7-solenoid valve A, 8-inlet solenoid valve, 9-outlet solenoid valve, 10-vacuum tank, 11-solenoid valve B, 12-oil pump, 13-vacuum pump;

[0043] 20-oil inlet of bubble monitoring device unit, 21-pipeline microporous sieve plate, 22-gas-liquid separation chamber sieve plate, 23-first-level gas-liquid separation chamber, 24-first-level bubble detector, 25-second-level gas-liquid separation chamber, 26-second-level bubble detector, 27-third-level gas-liquid separation chamber, 28-third-level bubble detector, 29-oil outlet of bubble monitoring device unit, 30-main pipe bubble detector. DETAILED DESCRIPTION

[0044] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0045] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships 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 limiting the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0046] Figures 1 to 5 The first embodiment of the present invention is shown: an insulating oil live vacuum bubble-free oil filling monitoring system, characterized in that it includes an online oil filling machine and an oil filling tee 41, the quick-connect outlet 1 of the online oil filling machine is connected to the oil inlet pipe 48 of the oil filling tee 41 through an oil filling pipeline, the circulating oil return quick interface 4 of the online oil filling machine is connected to one of the oil outlet pipes of the oil filling tee 41 through an oil return pipeline, the other oil outlet pipe of the oil filling tee 41 is connected to the oil filling valve 46 of the oil insulation equipment, and a valve having both a valve and a valve body is connected between the online oil filling machine and the oil filling tee 41. A bubble monitoring device unit with bubble monitoring and oil-gas separation functions; wherein: a connecting pipe 42 is installed in the oil outlet pipe of the oil replenishment tee 41 connected to the oil return pipeline through a sealing ring 40, and an exhaust pipe 43 made of plastically deformable material is connected to the inlet of the connecting pipe, and the exhaust pipe 43 extends into the valve cavity of the oil replenishment valve 46 and abuts against the valve core 45 of the oil replenishment valve 46, and is used on one hand to exhaust the air in the valve cavity of the oil replenishment valve 46, and on the other hand to match the oil replenishment pipeline and the oil return pipeline to realize the oil circulation in the oil replenishment monitoring process. Since there are usually two installation positions for the oil replenishment valve or the refueling valve or the sampling valve that can be used for oil replenishment of oil-insulated equipment, one is a horizontal setting, which is mostly a sampling valve, and the other is a vertical setting, so the oil replenishment tee 41 also has only vertical (such as Figure 2 ) and horizontal (such as Figure 3 ) two forms.

[0047] Please refer to 4. In specific implementation, the online oil replenishing machine is provided with a vacuum tank 10 with a vacuum pump 13, and its quick-connect outlet 1, quick-connect inlet 5 and circulating oil return quick interface 4 are respectively connected with the vacuum tank 10 through an oil circuit, and an oil pump 12 and an outlet solenoid valve 9 are provided on the oil circuit connecting the quick-connect outlet 1 and the vacuum tank 10, an inlet solenoid valve 8 is provided on the oil circuit connecting the quick-connect inlet 5 and the vacuum tank 10, and a circulating oil return solenoid valve 6 is provided on the oil circuit connecting the circulating oil return quick interface 4 and the vacuum tank 10. Preferably, an emptying structure is also provided in the online oil replenishing machine, and the emptying structure is used to empty the oil in the system pipeline after the oil replenishing operation is completed for next use. Specifically, the emptying structure includes an emptying air inlet 2, which is merged into the oil circuits connecting the quick-connect outlet 1, the quick-connect inlet 5, the circulating oil return quick connector 4 and the vacuum tank 10 through an emptying pipeline, and an emptying solenoid valve 3, a solenoid valve A7 and a solenoid valve B11 are also connected to the emptying pipeline. The redundant oil in the system pipeline can be emptied by switching the emptying solenoid valve 3, the solenoid valve A7 and the solenoid valve B11. When the equipment is replenished with oil and needs to be emptied, under the negative pressure of the vacuum tank 10, air enters through the exhaust air inlet 2 and the exhaust solenoid valve 3, and then reaches the circulation return oil quick interface 4 and the return oil pipe connected to the oil replenishment tee 41, enters the oil replenishment tee 41 from the interface 47, and comes out from the oil inlet pipe 48, and then connects to the bubble monitoring device unit through the oil replenishment pipe A, and then connects to the oil replenishment machine outlet 1 through the oil replenishment pipe B, enters the vacuum tank 10 through the solenoid valve A and the oil inlet solenoid valve 8, and then the oil pump 12 sends the oil to the oil storage barrel through the solenoid valve B and the quick-connect inlet 5 through the oil storage pipe, completing the oil emptying of all pipelines in the system.

[0048] from Figure 1 It can be seen that the oil replenishment pipeline includes an oil replenishment pipe A and an oil replenishment pipe B. The oil replenishment pipe A is connected to the oil inlet pipe 48 of the oil replenishment tee 41 and the oil outlet 29 of the bubble monitoring device unit, and the oil replenishment pipe B is connected to the quick-connect outlet 1 of the online oil replenishment machine and the oil inlet 20 of the bubble monitoring device unit. Preferably, a pressure sensor can be provided in the bubble monitoring device unit to obtain the oil pressure of the oil insulation equipment, so as to indirectly determine whether the oil replenishment is in place.

[0049] like Figure 5As shown, in this embodiment, a multi-stage bubble separation and monitoring structure is connected between the oil inlet 20 and the oil outlet 29 of the bubble monitoring device unit. The multi-stage bubble separation and monitoring structure includes n stages of gas-liquid separation chambers arranged in sequence, and the chamber space of each stage of the gas-liquid separation chamber is divided into an upper part and a lower part by a bubble separation screen plate 22. The upper chamber of each stage of the gas-liquid separation chamber is connected to an upper pipeline with a bubble detector, and the upper pipeline is used to connect the upper chamber of the n-stage gas-liquid separation chamber in series between the oil inlet 20 and the oil outlet 29 of the bubble monitoring device unit, and the pipe diameter of the upper pipeline of the n-stage gas-liquid separation chamber decreases step by step. The lower chamber of each stage of the gas-liquid separation chamber is also connected to a lower pipeline, and the lower pipeline is used to connect the upper chamber of the n-1-stage gas-liquid separation chamber and the lower chamber of the n-stage gas-liquid separation chamber in series between the oil inlet 20 and the oil outlet 29 of the bubble monitoring device unit, and a main pipe bubble detector 30 is connected in the lower pipeline at the end; wherein: n≥2 and n is a positive integer. Preferably, a pipeline microporous sieve plate 21 is provided in the oil inlet 20 of the bubble monitoring device unit and in the lower pipeline between two adjacent gas-liquid separation chambers. In a specific application scenario, the gas-liquid separation chamber is provided with three levels, a primary bubble detector 24 is provided in the upper pipeline of the primary gas-liquid separation chamber 23, a secondary bubble detector 26 is provided in the upper pipeline of the secondary gas-liquid separation chamber 25, and a tertiary bubble detector 28 is provided in the upper pipeline of the tertiary gas-liquid separation chamber 27.

[0050] In this embodiment, a multi-stage bubble separation technology is adopted. When the oil enters from the oil inlet 20 of the bubble monitoring device unit, it passes through the microporous sieve plate 21 of the pipeline, and the large bubbles are separated into smaller bubbles and enter the primary gas-liquid separation chamber 23. There is a gas-liquid separation chamber sieve plate 22 in the primary gas-liquid separation chamber 23, so that the oil turns over in the primary gas-liquid separation chamber 23, and the gas-containing liquid floats and gathers at the top through the top pipeline to pass through the primary bubble detector 24, and then enters the secondary gas-liquid separation chamber 25. The oil at the bottom of the primary gas-liquid separation chamber 23 also passes through the microporous sieve plate of the pipeline and enters the secondary gas-liquid separation chamber 25. According to the size of the oil inlet 20 of the bubble monitoring device unit, a multi-channel separator detection chamber can be set, and the bubble detection tube of each stage gradually changes from large to small, so as to improve the detection accuracy and response time. The main pipe bubble detector 30 detects a large number of bubbles in the main pipeline and the state when the pipeline is empty.

[0051] Embodiment 2 discloses an oil replenishment and exhaust method based on the above insulating oil charged vacuum bubble-free oil replenishment monitoring system, comprising the following steps:

[0052] S1: Connect one of the oil outlet pipes of the oil replenishing tee 41 to the oil replenishing valve 46 of the oil insulating device, and ensure that the oil replenishing valve 46 of the oil insulating device is in a closed state, so that the exhaust pipe 43 extends into the valve cavity of the oil replenishing valve 46 and abuts against the valve core 45 of the oil replenishing valve 46;

[0053] S2: Use the oil return pipe to connect the interface 47 of the built-in connecting pipe 42 in the other oil outlet pipe of the oil replenishment tee 41 and the circulation oil return quick interface 4 of the online oil replenishment machine, the oil replenishment pipe A connects the oil inlet pipe 48 of the oil replenishment tee 41 and the oil outlet 29 of the bubble monitoring device unit, the oil replenishment pipe B connects the quick-connect outlet 1 of the online oil replenishment machine and the oil inlet 20 of the bubble monitoring device unit, and the oil storage tank connects the quick-connect inlet 5 of the online oil replenishment machine and the oil storage barrel;

[0054] S3: The system oil storage cycle is exhausted, the bubble monitoring device unit selects the cycle monitoring mode, the vacuum pump 13 evacuates the vacuum tank 10, and when the pressure of the vacuum tank 10 drops to -60kPa, the inlet solenoid valve 8 is controlled to open, and the oil enters the vacuum tank 10 through the quick-connect inlet 5. Under the action of the oil pump 12, the oil passes through the outlet solenoid valve 9, the quick-connect outlet 1, the oil replenishment pipe B, the bubble monitoring device unit oil inlet 20, the bubble monitoring device unit oil outlet 29, the oil inlet pipe 48, the exhaust pipe 43, the connecting pipe 42, the interface 47, the circulating oil return quick interface 4, the circulating oil return solenoid valve 6, and the vacuum tank 10 for circulation. While the oil is circulating, the bubbles in various parts of the system can be brought into the vacuum tank 10;

[0055] S4: If the pressure of the vacuum tank 10 rises to greater than -60kPa, it is determined that the gas in the vacuum tank 10 increases, and the vacuum pump 13 is controlled to start, until the pressure in the vacuum tank 10 drops below -80kPa and the vacuum pump 13 is shut down; previously, it was only possible to observe with the naked eye whether there were still bubbles in the pipeline after multiple cycles of exhaust to determine whether the oil replenishment operation could be performed. Now, the bubble monitoring device unit can be used to observe whether there are still bubbles in the pipeline. Although the bubbles detected by the bubble monitoring device unit will not affect the oil replenishment machine's cyclic exhaust, it can intuitively see whether the number of bubbles currently detected is changing and whether there are still bubbles. This embodiment adopts a multi-stage bubble separation technology. When the oil enters from the oil inlet 20 of the bubble monitoring device unit, it passes through the microporous sieve plate 21 of the pipeline, and the large bubbles are separated into smaller bubbles and enter the primary bubble separation chamber 23. There is a bubble separation sieve plate 22 in the primary bubble separation chamber 23, so that the oil turns over in the primary bubble separation chamber 23, the gas-containing liquid floats and gathers at the top through the upper pipeline, passes through the primary bubble detector 24, and then enters the secondary bubble separation chamber 25. The oil at the bottom of the primary bubble separation chamber 23 also enters the secondary bubble separation chamber 25 through the lower pipeline and the microporous sieve plate 21 of the pipeline. According to the size of the oil inlet 20 of the bubble monitoring device unit, multiple bubble separation chambers can be set, and the diameter of the upper pipeline of each level of bubble separation chamber decreases step by step, so as to improve the detection accuracy and response time. The main pipe bubble detector 30 is used to detect a large number of bubbles in the main pipeline and the state when the pipeline is empty. As a preference, selecting the operation mode of multiple shutdowns and recirculation allows the bubbles separated at the top of the gas-liquid separation chamber to have time to gather and be transported to the upper pipeline passing through each level of bubble detectors. Therefore, when circulating the exhaust, you can try to choose a lower flow rate to expel the bubbles in the pipeline as quickly as possible and reduce the risk of oil replenishment and air intake.

[0056] S5: After the cycle monitoring reaches a predetermined number of times or / and a predetermined time, if the bubble monitoring device unit detects that the number of bubbles is less than or equal to a predetermined number threshold, the oil replenishment operation is started, and the bubble monitoring device unit selects a cycle oil replenishment mode, opens the oil replenishment valve 46 of the oil insulation device, and then opens the online oil replenishment machine to start oil replenishment;

[0057] S6: If new bubbles are found in the pipeline during the oil replenishment monitoring process, that is, any one of the primary bubble detector 24, the secondary bubble detector 26, the tertiary bubble detector 28, and the main pipe bubble detector 30 detects new bubbles, the solenoid valve of the bubble monitoring device unit will be closed after the predetermined number threshold is met, and the pressure of the quick-connect outlet 1 of the online oil replenishment machine will increase. After reaching the preset alarm pressure threshold of the online oil replenishment machine, the online oil replenishment machine will be stopped, the oil replenishment valve 46 will be closed, the solenoid valve of the bubble monitoring device unit and the online oil replenishment machine will be opened, and the process returns to step S3 to start the circulation monitoring mode;

[0058] S7: After the oil replenishment operation is completed, the pipeline emptying operation is started. Under the negative pressure of the vacuum tank 10, air enters through the emptying air inlet 2 and the emptying solenoid valve 3, and then comes to the oil return pipe through the circulating oil return quick interface 4, and enters the inside of the oil replenishment tee 41 from the interface 47, and then comes out from the oil inlet pipe 48 of the oil replenishment tee 41, and then passes through the oil replenishment pipe A, the bubble detection device unit oil outlet 29, and the bubble detection device unit oil inlet 20 to the quick-connect outlet 1 in turn, passes through the solenoid valve A7 and the inlet solenoid valve 8 to enter the vacuum tank 10, and finally the oil pump 12 sends the oil back to the oil storage barrel through the solenoid valve B11, the quick-connect inlet 5, and the oil storage pipe to complete the complete emptying of the redundant oil in the system pipeline.

[0059] In specific implementation, in step S7, the pressure data obtained by the pressure sensor built into the bubble monitoring device unit is used as a basis for judging whether the oil insulation equipment has been fully replenished with oil.

[0060] In summary, the present invention can build an exhaust pipe made of plastically deformable material into the air replenishing tee to abut against the valve core position of the oil replenishing valve of the oil-insulated equipment, thereby removing the air from the valve cavity of the oil replenishing valve from the flange to the valve core section, so as to meet the needs of various application scenarios, and ensure that the air is removed to the greatest extent before the circulation monitoring and oil replenishing monitoring are officially started, so as to avoid the air from being mixed into the oil during the circulation process to cause excessive bubbles, which is beneficial to reducing the operating burden of the bubble monitoring unit, ensuring the safety of oil replenishment and improving the efficiency of oil replenishment; by optimizing the pipeline design of the online oil replenishing machine and correspondingly arranging solenoid valves in each pipeline to achieve Open and close, so that after the oil replenishment operation is completed, the redundant oil in the system pipeline is emptied by switching the open and closed states of the solenoid valve. The entire emptying process is realized based on the pipeline structure of the system in the circulation monitoring state, so as to avoid the redundant oil spilling and polluting the environment and equipment during disassembly and assembly, and also eliminate the risk of transporting retained deteriorated oil to the oil-insulated equipment during the next oil replenishment operation; by setting a bubble monitoring device unit in the oil circulation pipeline, on the one hand, it can separate the gas contained in the oil, and on the other hand, it can monitor the number and frequency of bubbles in the oil circulation process, and automatically record various data, and use By comparing various data with preset parameters, functions such as alarm and oil replenishment circuit shutoff can be realized, thereby forcing the online oil replenishment machine to boost pressure and shut down; the bubble monitoring device unit adopts multi-stage bubble separation technology, and the bubble detectors at each stage work together to realize the step-by-step separation and accurate detection of bubbles, thereby improving the accuracy and reliability of bubble detection. At the same time, by adjusting the pipe diameters passing through the bubble detectors at each stage, the accuracy requirements for monitoring bubbles of different sizes can be met to meet the needs of different oil products and oil replenishment scenarios, thereby improving the flexibility and adaptability of oil replenishment operations; the online oil replenishment machine and each pipe are connected The paths are connected by quick-connect interfaces, which is convenient for rapid installation and disassembly, thereby improving the efficiency of the oil replenishment operation. At the same time, the design of the quick-connect interface can also take into account the sealing requirements of the system to reduce the risk of oil leakage. The bubble monitoring device unit controller built into the oil replenishment machine can intelligently control the entire cycle monitoring and oil replenishment monitoring process, and automatically adjust the oil flow rate, number of cycles and cycle time by comparing the monitoring data and preset parameters to ensure that the oil meets the oil replenishment requirements. At the same time, the controller can also record and store the oil replenishment process to facilitate subsequent data analysis and optimization.

[0061] Finally, it should be noted that the technical solution disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above-mentioned embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. An insulating oil charged vacuum bubble-free oil filling monitoring system, characterized in that: The invention comprises an online oil replenishing machine and an oil replenishing tee (41), wherein the quick-connect outlet (1) of the online oil replenishing machine is connected to an oil inlet pipe (48) of the oil replenishing tee (41) through an oil replenishing pipeline, the circulating oil return quick interface (4) of the online oil replenishing machine is connected to one of the oil outlet pipes of the oil replenishing tee (41) through an oil return pipeline, the other oil outlet pipe of the oil replenishing tee (41) is connected to an oil replenishing valve (46) of an oil insulating device, and a bubble monitoring device unit having both bubble monitoring and oil-gas separation functions is also connected between the online oil replenishing machine and the oil replenishing tee (41); Wherein: a connecting pipe (42) is installed in the oil outlet pipe of the oil replenishment tee (41) connected to the oil return pipeline through a sealing ring (40); an exhaust pipe (43) made of a plastically deformable material is connected to the inlet of the connecting pipe; the exhaust pipe (43) extends into the valve cavity of the oil replenishment valve (46) and abuts against the valve core (45) of the oil replenishment valve (46); and on one hand, it is used to exhaust the air in the valve cavity of the oil replenishment valve (46); on the other hand, it is used to match the oil replenishment pipeline and the oil return pipeline to realize the oil circulation in the oil replenishment monitoring process; The oil replenishment pipeline includes an oil replenishment pipe A and an oil replenishment pipe B, wherein the oil replenishment pipe A is connected to the oil inlet pipe (48) of the oil replenishment tee (41) and the oil outlet (29) of the bubble monitoring device unit, and the oil replenishment pipe B is connected to the quick-connect outlet (1) of the online oil replenishment machine and the oil inlet (20) of the bubble monitoring device unit; A multi-stage bubble separation and monitoring structure is connected between the oil inlet (20) and the oil outlet (29) of the bubble monitoring device unit; The multi-stage bubble separation and monitoring structure comprises n stages of gas-liquid separation chambers arranged in sequence, the chamber space of each stage of the gas-liquid separation chamber is divided into an upper part and a lower part by a bubble separation sieve plate (22), the upper chamber of each stage of the gas-liquid separation chamber is connected to an upper pipeline with a bubble detector, the upper pipeline is used to connect the upper chamber of the n-stage gas-liquid separation chamber in series between the oil inlet (20) and the oil outlet (29) of the bubble monitoring device unit, and the pipe diameter of the upper pipeline of the n-stage gas-liquid separation chamber decreases step by step, and the lower chamber of each stage of the gas-liquid separation chamber is also connected to a lower pipeline, the lower pipeline is used to connect the upper chamber of the n-1-stage gas-liquid separation chamber and the lower chamber of the n-stage gas-liquid separation chamber in series between the oil inlet (20) and the oil outlet (29) of the bubble monitoring device unit, and the lower pipeline at the end is connected to a main pipe bubble detector (30); wherein: n≥2 and n is a positive integer.

2. The insulating oil live vacuum bubble-free oil filling monitoring system according to claim 1 is characterized in that: The online oil replenishing machine is provided with a vacuum tank (10) with a vacuum pump (13), wherein the quick-connect outlet (1), the quick-connect inlet (5) and the circulating oil return quick interface (4) are respectively connected to the vacuum tank (10) through an oil circuit, an oil pump (12) and an outlet solenoid valve (9) are provided on the connecting oil circuit between the quick-connect outlet (1) and the vacuum tank (10), an inlet solenoid valve (8) is provided on the connecting oil circuit between the quick-connect inlet (5) and the vacuum tank (10), and a circulating oil return solenoid valve (6) is provided on the connecting oil circuit between the circulating oil return quick interface (4) and the vacuum tank (10).

3. The insulating oil live vacuum bubble-free oil filling monitoring system according to claim 2 is characterized by: The online oil replenishing machine is also provided with an emptying structure, which is used to empty the oil in the system pipeline after the oil replenishing operation is completed for next use.

4. The insulating oil live vacuum bubble-free oil filling monitoring system according to claim 3 is characterized by: The exhaust structure comprises an exhaust air inlet (2), wherein the exhaust air inlet (2) is connected to the oil circuits of the quick-connect outlet (1), the quick-connect inlet (5), the circulating oil return quick connector (4) and the vacuum tank (10) through an exhaust pipeline, and an exhaust solenoid valve (3), an exhaust solenoid valve A (7) and an exhaust solenoid valve B (11) are also connected to the exhaust pipeline. The redundant oil in the system pipeline can be exhausted by switching the exhaust solenoid valve (3), the exhaust solenoid valve A (7) and the exhaust solenoid valve B (11) on and off.

5. The insulating oil live vacuum bubble-free oil filling monitoring system according to claim 4 is characterized in that: A pipeline microporous sieve plate (21) is arranged at the oil inlet (20) of the bubble monitoring device unit and in the lower pipeline between two adjacent gas-liquid separation chambers.

6. The insulating oil live vacuum bubble-free oil filling monitoring system according to claim 1 or 5, characterized in that: The gas-liquid separation chamber is provided with three levels in total. A first-level bubble detector (24) is correspondingly provided in the upper pipeline of the first-level gas-liquid separation chamber (23), a second-level bubble detector (26) is correspondingly provided in the upper pipeline of the second-level gas-liquid separation chamber (25), and a third-level bubble detector (28) is correspondingly provided in the upper pipeline of the third-level gas-liquid separation chamber (27).

7. An oil filling and exhaust method for the insulating oil live vacuum bubble-free oil filling monitoring system according to any one of claims 1 to 6, characterized in that The following steps are involved: S1: connecting one of the oil outlet pipes of the oil supply tee (41) to the oil supply valve (46) of the oil insulation device, ensuring that the oil supply valve (46) of the oil insulation device is in a closed state, so that the exhaust pipe (43) extends into the valve cavity of the oil supply valve (46) and abuts against the valve core (45) of the oil supply valve (46); S2: Use the oil return pipe to connect the interface (47) of the built-in connecting pipe (42) in the other oil outlet pipe of the oil replenishment tee (41) and the circulation oil return quick interface (4) of the online oil replenishment machine, the oil replenishment pipe A connects the oil inlet pipe (48) of the oil replenishment tee (41) and the oil outlet (29) of the bubble monitoring device unit, the oil replenishment pipe B connects the quick-connect outlet (1) of the online oil replenishment machine and the oil inlet (20) of the bubble monitoring device unit, and the oil storage tank connects the quick-connect inlet (5) of the online oil replenishment machine and the oil storage barrel; S3: The system oil storage is circulated and exhausted, the bubble monitoring device unit selects the circulation monitoring mode, the vacuum pump (13) evacuates the vacuum tank (10), and when the pressure of the vacuum tank (10) drops to -60 kPa, the inlet solenoid valve (8) is controlled to open, and the oil enters the vacuum tank (10) through the quick-connect inlet (5). Under the action of the oil pump (12), the oil passes through the outlet solenoid valve (9), the quick-connect outlet (1), the oil replenishment pipe B, the oil inlet (20) of the bubble monitoring device unit, the oil outlet (29) of the bubble monitoring device unit, the oil inlet pipe (48), the exhaust pipe (43), the connecting pipe (42), the interface (47), the circulation oil return quick interface (4), the circulation oil return solenoid valve (6), and the vacuum tank (10) for circulation. When the oil circulates, bubbles in various parts of the system can be brought into the vacuum tank (10); S4: If the pressure of the vacuum tank (10) rises to greater than -60 kPa, it is determined that the gas in the vacuum tank (10) increases, and the vacuum pump (13) is controlled to start, until the pressure in the vacuum tank (10) drops to less than -80 kPa, and the vacuum pump (13) is stopped; S5: After the cycle monitoring reaches a predetermined number of times or / and a predetermined time, if the bubble monitoring device unit detects that the number of bubbles is less than or equal to a predetermined number threshold, the oil replenishment operation is started, the bubble monitoring device unit selects a cycle oil replenishment mode, opens the oil replenishment valve (46) of the oil insulation device, and then opens the online oil replenishment machine to start oil replenishment; S6: If new bubbles are found in the pipeline during the oil replenishment monitoring process, that is, any of the first-stage bubble detector (24), the second-stage bubble detector (26), the third-stage bubble detector (28), and the main pipe bubble detector (30) detects new bubbles, the solenoid valve of the bubble monitoring device unit will be closed after the predetermined number threshold is met, and the pressure of the quick-connect outlet (1) of the online oil replenishment machine will increase. After reaching the preset alarm pressure threshold of the online oil replenishment machine, the online oil replenishment machine will be stopped, the oil replenishment valve (46) will be closed, the solenoid valve of the bubble monitoring device unit and the online oil replenishment machine will be opened, and the process will return to step S3 to start the circulation monitoring mode; S7: After the oil replenishment operation is completed, the pipeline emptying operation is started. Under the negative pressure of the vacuum tank (10), air enters through the emptying air inlet (2) and the emptying solenoid valve (3), and then comes to the oil return pipe through the circulating oil return quick interface (4), and enters the inside of the oil replenishment tee (41) from the interface (47), and then comes out from the oil inlet pipe (48) of the oil replenishment tee (41), and then passes through the oil replenishment pipe A, the bubble detection device unit oil outlet (29), and the bubble detection device unit oil inlet (20) to the quick-connect outlet (1), passes through the solenoid valve A (7) and the inlet solenoid valve (8) to enter the vacuum tank (10), and finally the oil pump (12) sends the oil back to the oil storage barrel through the solenoid valve B (11), the quick-connect inlet (5), and the oil storage pipe, so as to complete the complete emptying of the redundant oil in the system pipeline.

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