High pressure bushing oil extraction and oil supplementing device with pipeline flushing

Abstract

This invention discloses a high-pressure bushing oil sampling and replenishment device with pipeline flushing, relating to the field of power equipment technology. The device includes a high-pressure bushing, a waste oil tank, an oil storage tank, and a sampling mechanism. The sampling mechanism has an internal mechanical linkage sealing structure composed of a movable ring, a connecting rod, a release component, and an elastic element. This invention effectively eliminates "dead oil" in the pipeline by automatically flushing the pipeline using the pressure difference between the waste oil tank and the high-pressure bushing before sampling, ensuring the representativeness of the oil sample. The syringe directly pushes the movable ring when inserted into the sampling mechanism, achieving immediate insertion and opening, and immediate removal and sealing, avoiding leakage and contamination during the sampling process. Simultaneously, a thermometer on the waste oil tank obtains the real-time oil temperature to calculate the thermal expansion compensation, and an air pump combined with a mass flow meter achieves precise quantitative oil replenishment. This invention solves the problems of poor sample representativeness, easy leakage, and low oil replenishment accuracy in existing technologies, achieving clean and convenient sampling operations and automatic and precise control of oil replenishment.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, and in particular to a high-voltage bushing oil sampling and replenishment device with pipeline flushing, which is used to collect insulating oil samples from high-voltage bushings without contamination, and to accurately and automatically replenish oil according to the oil temperature after sampling. Background Technology

[0002] As a core piece of equipment in the power system, the operating status of high-voltage bushings is directly related to the safety and stability of the power grid. In order to monitor the performance indicators of the insulating oil inside the high-voltage bushings, maintenance personnel need to regularly take oil samples from the high-voltage bushings for testing. By analyzing the dissolved gas components and physicochemical indicators in the oil samples, the health status of the high-voltage bushings can be determined.

[0003] When performing oil sampling operations, the sampling port at the bottom of the high-pressure bushing is usually used for sampling. However, a certain amount of "dead oil" often accumulates in the connecting pipeline between the high-pressure bushing body and the external sampling port. Since this part of the oil has not participated in the main circulation for a long time, its various indicators may not be able to truly reflect the current actual condition inside the high-pressure bushing. If the syringe is directly connected for sampling, the sample collected is often this part of the stagnant oil, which will seriously interfere with the accuracy of the test results and lead to misjudgment of the equipment status.

[0004] To obtain a representative oil sample, existing technologies typically require opening a valve to drain a portion of the oil to flush the pipeline before sampling. However, this traditional oil flushing method is often crude, making it difficult to precisely control the discharge volume and wasting insulating oil. Furthermore, the open discharge process can easily lead to oil splashing and contamination of the site environment. Additionally, the existing interface structure is relatively simple when connecting sampling tools (such as syringes) after flushing, making it easy to introduce air or cause leakage during insertion and removal. Moreover, the sampling and flushing process consumes oil inside the high-voltage bushing, requiring subsequent oil replenishment. However, existing oil replenishment operations often lack consideration of the real-time oil temperature inside the high-voltage bushing, making it difficult to accurately control the amount of oil replenished based on thermal expansion and contraction characteristics, which can easily lead to abnormal oil levels in the high-voltage bushing. Summary of the Invention

[0005] In view of the problems in existing high-pressure bushing oil sampling and replenishment operations, such as the distortion of oil sample detection due to "dead oil" residue in the pipeline, and the abnormal oil level caused by the inability to accurately control the replenishment amount according to the oil temperature, the present invention proposes a high-pressure bushing oil sampling and replenishment device with pipeline flushing.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution, including:

[0007] A high-pressure bushing, which is connected to an oil storage tank and a waste oil tank via pipelines;

[0008] The sampling mechanism is connected to the pipeline between the high-pressure bushing and the waste oil tank;

[0009] The sampling mechanism includes: a sleeve, a movable ring, a connecting rod, a release assembly, and an elastic element;

[0010] A sampling channel is formed inside the sleeve;

[0011] The movable ring is slidably fitted inside the sleeve;

[0012] One end of the connecting rod is fixedly connected to the movable ring;

[0013] The release assembly is fixedly connected to the other end of the connecting rod and slidably fitted inside the sleeve; the release assembly includes a sealing ring for sealing the sampling channel;

[0014] The elastic element is disposed inside the sleeve and is used to provide an elastic force to the movable ring to keep the release assembly in a blocked state;

[0015] The movable ring is configured to overcome the elastic force of the elastic element under the action of external force, drive the connecting rod and the release assembly to move axially, and release the sealing ring from blocking the sampling channel.

[0016] Furthermore,

[0017] The release assembly further includes a circular plate and a conical block. The circular plate is fixedly connected to the connecting rod, and the conical block is fixedly connected to the side of the circular plate away from the connecting rod. The sealing ring is sleeved between the circular plate and the conical block, and its outer circumferential surface abuts against the inner wall of the sleeve in its natural state.

[0018] Furthermore,

[0019] The elastic element is a spring, which is sleeved on the outer periphery of the connecting rod. One end of the spring abuts against the inner wall step of the sleeve, and the other end abuts against the end face of the movable ring.

[0020] Furthermore,

[0021] The device also includes a syringe used in conjunction with the sampling mechanism. The outer diameter of the syringe is adapted to the inner diameter of the cannula, and the end of the syringe can extend into the cannula and press against the movable ring to generate the external force.

[0022] Furthermore,

[0023] The top of the waste oil tank is connected to the high-pressure bushing via a first solenoid valve; the top of the oil storage tank is connected to the high-pressure bushing via a second solenoid valve.

[0024] Furthermore,

[0025] A thermometer is installed on the waste oil tank, and the probe of the thermometer extends into the interior of the waste oil tank.

[0026] Furthermore,

[0027] The oil storage tank is connected to an air pump for filling it with air to drive new oil into the high-pressure bushing.

[0028] Furthermore,

[0029] A mass flow meter is also installed on the pipeline between the sampling mechanism and the high-pressure bushing.

[0030] Furthermore,

[0031] The device also includes a holding mechanism for locking the pipeline to the oil inlet valve of the high-pressure bushing.

[0032] Furthermore,

[0033] The holding mechanism includes:

[0034] A collar, fitted over the outside of a pipeline, has an axial opening;

[0035] A retaining ring is fitted onto the outside of the collar;

[0036] The center rod is fixedly connected to the outer wall of the collar;

[0037] A wheel is rotatably connected to the central rod, and its axis of rotation is eccentrically set relative to the axis of the central rod. The outer circumferential surface of the wheel is in rolling contact with the outer wall of the fixed ring. A handle is fixedly connected to the wheel.

[0038] Specifically, pulling the handle drives the wheel to rotate, which in turn forces the fixing ring to cause the collar to contract radially through the change in eccentricity, thereby tightening the pipeline.

[0039] The beneficial effects of this invention are as follows:

[0040] 1. This invention solves the problem in the prior art that dead oil or impurities are easily left in the sampling pipeline, leading to impure test samples, by setting up a controllable waste oil tank between the high-voltage bushing and the sampling mechanism, and using oil pressure to drive the oil inside the transformer to flush the pipeline multiple times before sampling. This achieves the technical effect of effectively replacing the old oil in the pipeline, ensuring that the oil sample taken is highly representative, and thus improving the accuracy of the high-voltage bushing oil sample test results.

[0041] 2. This invention, by setting up a mechanically linked sampling mechanism, uses the thrust of the syringe when it is inserted into the cannula to directly drive the internal moving ring and release component to move, thereby opening the sealed oil circuit. After the syringe is pulled out, the spring force automatically resets the seal, solving the problems of cumbersome operation steps, easy oil leakage or contact with external air to contaminate the sample in the existing sampling method. It achieves the technical effect of simple and fast sampling operation, instant opening upon insertion and instant sealing upon removal, effective prevention of leakage and isolation of external contamination.

[0042] 3. This invention solves the problems of difficulty in replenishing oil after sampling and difficulty in accurately controlling the amount of oil replenished based on the thermal expansion and contraction characteristics of oil in the prior art by setting up an oil storage tank connected to an air pump and configuring a thermometer on the waste oil tank. The positive pressure generated by the air pump is used to push the new oil in the oil storage tank back into the high-pressure bushing. The mass flow meter is used to accurately control the volume of oil taken out and replenished, and the temperature of the waste oil just flushed out is used to indirectly know the oil temperature inside the high-pressure bushing. This invention achieves the technical effect of using air pressure to realize efficient automatic oil replenishment, and can accurately calculate and control the amount of oil reinjected based on the real-time oil temperature to ensure that the oil level in the high-pressure bushing is within the normal range. Attached Figure Description

[0043] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the overall structure of a high-pressure bushing oil extraction and replenishment device with pipeline flushing according to the present invention.

[0045] Figure 2 for Figure 1 A magnified schematic diagram of part A in the middle.

[0046] Figure 3 for Figure 1 A magnified schematic diagram of the structure of part B in the middle section.

[0047] Figure 4 This is a cross-sectional structural diagram of the sampling mechanism of the present invention.

[0048] Figure label:

[0049] 1-High-pressure bushing; 2-Waste oil tank; 3-Sampling mechanism; 4-Injector; 5-Thermometer; 6-First solenoid valve; 7-Oil storage tank; 9-Holding mechanism; 10-Air pump; 11-Mass flow meter; 31-Bushing bushing; 32-Moving ring; 33-Connecting rod; 34-Release assembly; 35-Spring; 61-Second solenoid valve; 91-Collar ring; 92-Pull handle; 93-Round wheel; 94-Center rod; 95-Fixing ring; 341-Circular plate; 342-Sealing ring; 343-Conical block. Detailed Implementation

[0050] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0051] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0052] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0053] Example 1

[0054] Reference Figures 1 to 4 This embodiment provides a schematic diagram of the overall structure of a high-pressure bushing oil sampling and replenishment device with pipeline flushing. The high-pressure bushing 1 is connected to the waste oil tank 2 through a pipeline. The high-pressure bushing 1 serves as the main body of the power equipment. The waste oil tank 2 is used to collect waste oil generated by pipeline flushing. A sampling mechanism 3 is connected to the pipeline between the high-pressure bushing 1 and the waste oil tank 2. The sampling mechanism 3 is set at the branch of the pipeline for collecting oil samples. The high-pressure bushing 1 is also connected to the oil storage tank 7 through an independent pipeline. The oil storage tank 7 is used to store new oil for replenishment.

[0055] The main structure of the sampling mechanism 3 includes a sleeve 31 and a movable ring 32 that slides inside the sleeve 31. The sleeve 31 is installed in the pipeline as a support. The movable ring 32 slides along the axial direction of the sleeve 31 to transmit mechanical action. A connecting rod 33 is fixedly connected to the side of the movable ring 32 near the waste oil tank 2. The connecting rod 33 passes through the internal space of the sleeve 31. A release component 34 is fixedly connected to the end of the connecting rod 33 away from the movable ring 32. The release component 34 slides inside the sleeve 31 and is used to control the opening and closing of the sampling channel.

[0056] The release assembly 34 includes a circular plate 341, with a conical block 343 fixedly connected to the side of the circular plate 341 away from the connecting rod 33. A sealing ring 342 is sleeved between the circular plate 341 and the conical block 343. In a naturally closed state, the outer circumferential surface of the sealing ring 342 tightly abuts against the inner wall of the sleeve 31 to form a seal. The interference fit characteristic of the sealing ring 342 blocks the flow of oil. The movable ring 32 is configured to drive the connecting rod 33 and the release assembly 34 to move axially along the sleeve 31 when pushed by an external force, so that the sealing ring 342 disengages from the sealing contact area with the inner wall of the sleeve 31, thereby forming a gap for oil flow between the inner wall of the sleeve 31 and the release assembly 34.

[0057] A spring 35 is also provided inside the sleeve 31. The spring 35 is sleeved on the outer periphery of the connecting rod 33. One end of the spring 35 abuts against the stepped structure on the inner wall of the sleeve 31, and the other end of the spring 35 abuts against the side end face of the movable ring 32 near the connecting rod 33. The function of the spring 35 is to release elastic potential energy after sampling, push the movable ring 32 to reset, and then drive the release component 34 to re-close the pipeline.

[0058] The top of waste oil tank 2 is connected to high-pressure bushing 1 via a first solenoid valve 6, which controls the opening and closing of the flushing oil circuit. The top of oil storage tank 7 is connected to high-pressure bushing 1 via a second solenoid valve 61, which controls the opening and closing of the replenishment oil circuit.

[0059] A thermometer 5 is also installed on the outer wall or inside the waste oil tank 2. The probe of the thermometer 5 extends into the interior of the waste oil tank 2 and is immersed in the liquid to detect the temperature of the waste oil that has been flushed into the waste oil tank 2 in real time.

[0060] The upper part of the oil storage tank 7 is connected to the air pump 10. The air outlet of the air pump 10 is connected to the inside of the oil storage tank 7. The air pump 10 is used to fill the oil storage tank 7 with high-pressure air to form a pneumatic driving force inside the oil storage tank 7. The outer diameter of the syringe 4 and the inner diameter of the sleeve 31 are fitted with a clearance. The end configuration of the syringe 4 is configured to extend into the sleeve 31 and directly press against the side end face of the movable ring 32 away from the connecting rod 33.

[0061] A mass flow meter 11 is also installed on the pipeline between the sampling mechanism 3 and the high-pressure bushing 1. The mass flow meter 11 is used to monitor the volume of oil flowing through the pipeline in real time during the oil sampling and oil replenishment process, and is linked with the air pump 10 for control, so as to achieve precise adjustment of the oil replenishment amount.

[0062] like Figure 2 and Figure 4As shown, a holding mechanism 9 is provided at the oil inlet valve of the high-pressure bushing 1 to mechanically lock the pipeline to the oil inlet valve of the high-pressure bushing 1. The holding mechanism 9 includes a collar 91 sleeved on the outside of the pipeline and a fixing ring 95 sleeved on the outside of the collar 91. The collar 91 has an axial opening, so that the two ends of the collar 91 maintain a distance in the natural state, allowing the collar 91 to undergo radial contraction deformation after being subjected to force to tighten the pipeline.

[0063] A central rod 94 is fixedly connected to the outer wall of the collar 91. The central rod 94 is a T-shaped cylindrical rod serving as a support shaft. A wheel 93 is rotatably connected to the outer circumference of the central rod 94. The wheel 93 is axially constrained between the head of the central rod 94 and the collar 91. A handle 92 is fixedly connected to the outer wall of the wheel 93, serving as a manual operating lever. The wheel 93 is eccentrically positioned relative to the rotation axis of the central rod 94, and its outer circumferential surface maintains rolling contact with the outer wall of the fixed ring 95. When the handle 92 is pulled, the wheel 93 rotates around the central rod 94. Due to its eccentric structure, the outer circumferential surface of the wheel 93 generates a gradually increasing radial compressive force on the inner wall of the fixed ring 95, forcing the fixed ring 95 to undergo radial deformation. This, in turn, causes the collar 91, which has an axial opening, to radially contract, thereby gripping the pipe inserted within it.

[0064] Example 2

[0065] This embodiment illustrates the working principle of the high-pressure bushing oil sampling and replenishment device of the present invention, as follows:

[0066] When testing oil samples from high-pressure bushing 1, first open the first solenoid valve 6 to connect waste oil tank 2. Then open the oil inlet valve of high-pressure bushing 1. Using the pressure difference between the internal pressure of high-pressure bushing 1 and waste oil tank 2, drive the oil inside high-pressure bushing 1 to flow into waste oil tank 2 through the pipeline. This process is repeated two to three times. The high-speed flow of oil flushes the inner wall of the pipeline, and discharges the residual old oil and impurities in the pipeline into waste oil tank 2 to ensure the representativeness of subsequent sampling.

[0067] After the pipeline flushing is completed, the syringe 4 is inserted into the sleeve 31 of the sampling mechanism 3. The front end of the syringe 4 pushes the movable ring 32, so that the movable ring 32 overcomes the resistance of the spring 35 and drives the connecting rod 33 and the release component 34 to move backward along the axial direction of the sleeve 31. The sealing ring 342 moves with the circular plate 341 and the conical block 343 and disengages from the sealing position of the inner wall of the sleeve 31. The oil passage is opened, and the oil flows into the syringe 4 through the gap to complete the sampling. After the sampling is completed, the syringe 4 is pulled out, the spring 35 releases its elastic force to push the movable ring 32 to reset, and drives the sealing ring 342 to re-seal the oil passage.

[0068] After sampling, the second solenoid valve 61 is opened, and the air pump 10 is started to pressurize the oil storage tank 7. The air pressure is used to make the new oil in the oil storage tank 7 overcome the pipeline resistance and flow back into the high-pressure bushing 1. During the oil replenishment process, the temperature of the waste oil that has just been replaced is known by observing the reading of the thermometer 5 on the waste oil tank 2. The amount of oil replenishment is accurately calculated and controlled according to the coefficient of thermal expansion at the temperature. At the same time, the replenishment volume is monitored in real time by the mass flow meter 11 to realize the closed-loop control of the oil replenishment process.

[0069] Throughout the operation, the clamping mechanism 9 is used to reinforce the pipeline connection. Pressing the handle 92 drives the eccentrically set wheel 93 to rotate. During the rotation, the wheel 93 applies radial extrusion force to the fixed ring 95 by changing the eccentricity. After the fixed ring 95 is subjected to force, it drives the two ends of the collar 91 to move closer to each other, thereby shrinking the inner diameter of the collar 91 and firmly clamping the pipeline to the oil inlet valve to prevent loosening or leakage.

[0070] Example 3

[0071] This embodiment provides an automated control process for a high-pressure bushing oil sampling and replenishment device with pipeline flushing, suitable for use in conjunction with the device described in Embodiment 1. Based on the device structure described in Embodiment 1, this embodiment adds a controller to achieve automated control. The controller is electrically connected to a first solenoid valve 6, a second solenoid valve 61, an air pump 10, a mass flow meter 11, and a thermometer 5, and is used to automatically control the oil sampling, flushing, sampling, and replenishment processes according to a preset program.

[0072] The automated control process is as follows:

[0073] Step 1: Pipeline flushing; The controller opens the first solenoid valve 6 while keeping the second solenoid valve 61 closed. Utilizing the pressure difference between the internal pressure of the high-pressure sleeve 1 and the waste oil tank 2, the oil inside the high-pressure sleeve 1 flows into the waste oil tank 2 through the pipeline. After flushing for a preset time, the controller closes the first solenoid valve 6, completing one flush. The above flushing process is repeated two to three times to ensure that the old oil in the pipeline is fully replaced.

[0074] Step 2: Sampling; After rinsing, the operator inserts syringe 4 into the sleeve 31 of the sampling mechanism 3. The front end of syringe 4 pushes against the movable ring 32, causing the sealing ring 342 to release the blockage of the sampling channel, and the oil automatically flows into syringe 4 to complete the sampling. After syringe 4 is pulled out, the sampling mechanism 3 automatically resets the seal.

[0075] Step 3: Oil Replenishment; The controller calculates the thermal expansion compensation corresponding to the oil temperature inside the high-pressure bushing 1 based on the waste oil temperature detected by thermometer 5, and determines the required oil replenishment amount by combining the oil volume flowing through mass flow meter 11 during sampling and flushing. The controller then opens the second solenoid valve 61 and starts the air pump 10 to pressurize the oil storage tank 7, returning the new oil in the storage tank 7 to the inside of the high-pressure bushing 1 through the pipeline. At the same time, mass flow meter 11 monitors the replenishment volume in real time. When the replenishment amount reaches the preset value, the controller closes the second solenoid valve 61 and stops the air pump 10, completing the automatic oil replenishment.

[0076] This embodiment uses a controller to automate the oil extraction, rinsing, and replenishment processes, further improving the convenience of operation and the controllability of replenishment accuracy, while avoiding human error.

[0077] In the description of this invention, it should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0078] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0079] In the several embodiments provided by this invention, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the coupling or direct coupling or communication connection shown or discussed may be through some communication interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0080] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0081] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0082] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

[0083] Furthermore, although the operations of the method of the present invention are described in a specific order in the accompanying drawings, this does not require or imply that these operations must be performed in that specific order, or that all the operations shown must be performed to achieve the desired result. Additionally or alternatively, certain steps may be omitted, multiple steps may be combined into one step, and / or one step may be broken down into multiple steps.

Claims

1. A high-pressure bushing oil extraction and replenishment device with pipeline flushing, Its features are, include: High-pressure bushing (1), which is connected to the oil storage tank (7) and the waste oil tank (2) respectively through pipelines; The sampling mechanism (3) is connected to the pipeline between the high-pressure bushing (1) and the waste oil tank (2); The sampling mechanism (3) includes: a sleeve (31), a movable ring (32), a connecting rod (33), a release assembly (34), and an elastic element (35); A sampling channel is formed inside the sleeve (31); The movable ring (32) is slidably fitted inside the sleeve (31); One end of the connecting rod (33) is fixedly connected to the movable ring (32); The release assembly (34) is fixedly connected to the other end of the connecting rod (33) and slidably fitted inside the sleeve (31); the release assembly (34) includes a sealing ring (342) for sealing the sampling channel. The elastic element (35) is disposed inside the sleeve (31) and is used to provide the movable ring (32) with an elastic force to keep the release assembly (34) in a blocked state; The movable ring (32) is configured to overcome the elastic force of the elastic element (35) under the action of external force, drive the connecting rod (33) and the release assembly (34) to move axially, so that the sealing ring (342) releases the blockage of the sampling channel.

2. The high-pressure bushing oil extraction and replenishment device with pipeline flushing as described in claim 1, Its features are, The release assembly (34) further includes a circular plate (341) and a conical block (343). The circular plate (341) is fixedly connected to the connecting rod (33), and the conical block (343) is fixedly connected to the side of the circular plate (341) away from the connecting rod (33). The sealing ring (342) is sleeved between the circular plate (341) and the conical block (343), and its outer circumferential surface abuts against the inner wall of the sleeve (31) in its natural state.

3. A high-pressure bushing oil extraction and replenishment device with pipeline flushing as described in claim 1. Its features are, The elastic element (35) is a spring, which is sleeved on the outer periphery of the connecting rod (33). One end of the spring abuts against the inner wall step of the sleeve (31), and the other end abuts against the end face of the movable ring (32).

4. A high-pressure bushing oil extraction and replenishment device with pipeline flushing as described in claim 1. Its features are, The device also includes a syringe (4) used in conjunction with the sampling mechanism (3), the outer diameter of the syringe (4) being adapted to the inner diameter of the sleeve (31), and the end of the syringe (4) being able to extend into the sleeve (31) and press against the movable ring (32) to form the external force.

5. A high-pressure bushing oil extraction and replenishment device with pipeline flushing as described in claim 1. Its features are, The top of the waste oil tank (2) is connected to the high-pressure bushing (1) through the first solenoid valve (6); the top of the oil storage tank (7) is connected to the high-pressure bushing (1) through the second solenoid valve (61).

6. A high-pressure bushing oil extraction and replenishment device with pipeline flushing as described in claim 5. Its features are, A thermometer (5) is installed on the waste oil tank (2), and the probe of the thermometer (5) extends into the interior of the waste oil tank (2).

7. A high-pressure bushing oil extraction and replenishment device with pipeline flushing as described in claim 1. Its features are, The oil storage tank (7) is connected to an air pump (10) for filling it with air to drive new oil into the high-pressure bushing (1).

8. A high-pressure bushing oil extraction and replenishment device with pipeline flushing as described in claim 1. Its features are, A mass flow meter (11) is also installed on the pipeline between the sampling mechanism (3) and the high-pressure bushing (1).

9. A high-pressure bushing oil extraction and replenishment device with pipeline flushing as described in claim 1. Its features are, The device also includes a holding mechanism (9) for locking the pipeline to the oil inlet valve of the high-pressure bushing (1).

10. A high-pressure bushing oil extraction and replenishment device with pipeline flushing according to claim 9. Its features are, The holding mechanism (9) includes: A collar (91) is fitted onto the outside of the pipeline and has an axial opening; A fixing ring (95) is fitted onto the outside of the collar (91); The center rod (94) is fixedly connected to the outer wall of the collar (91); A wheel (93) is rotatably connected to the central rod (94), and its rotation axis is eccentrically set relative to the axis of the central rod (94). The outer circumferential surface of the wheel (93) rolls in contact with the outer wall of the fixed ring (95); and a handle (92) is fixedly connected to the wheel (93). When the handle (92) is turned, the wheel (93) is rotated. The change in eccentricity forces the fixed ring (95) to drive the collar (91) to contract radially, so as to tighten the pipeline.

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