An oil chromatography degassing tank aging test fixture

Abstract

This utility model relates to the field of power equipment condition monitoring and fault diagnosis technology, and discloses an oil chromatography degassing tank aging test fixture, including: a main oil tank, an auxiliary oil tank, a vacuum pump, an oil pump, an inlet valve, an outlet valve, a venting valve, a pressure sensor, a level sensor, a control unit, and a power module; the main oil tank and the auxiliary oil tank are connected by an oil circuit to form a closed-loop cyclic test system; this utility model can accurately record the number of times the level sensor is falsely triggered or not triggered through tens of thousands of cyclic tests, calculate the failure probability, and provide data support for product improvement; based on MCU program control, it realizes fully automatic cyclic testing, reduces manual intervention, and improves testing efficiency and consistency.

Description

Technical Field

[0001] This utility model relates to the field of power equipment condition monitoring and fault diagnosis technology, specifically an oil chromatography degassing tank aging test fixture. Background Technology

[0002] Oil chromatography is a crucial method for dissolved gas analysis (DGA) of insulating oil in power transformers. By detecting the content and composition of characteristic dissolved gases in the oil, latent faults within the transformer can be detected promptly. The vacuum degassing unit, a key pretreatment device in the oil chromatography system, removes dissolved gases from the insulating oil and transports them to the chromatograph for analysis. The core component of the degassing unit is the main oil tank, and the accuracy of its level control directly affects the degassing efficiency and the reliability of the analytical results.

[0003] In actual operation, the degassing unit needs to repeatedly perform operations such as oil inlet, degassing, and oil outlet, causing frequent operation of components such as level sensors and solenoid valves. After long-term operation, these components are prone to aging, wear, or performance drift, leading to misjudgments in level detection or control failure, which in turn affects the stability of the entire system and the accuracy of data analysis. Currently, the testing of oil chromatography degassing units, both domestically and internationally, is mostly limited to functional verification and short-term performance testing, lacking accelerated aging testing methods for long-term reliability. Traditional testing methods are time-consuming, inefficient, and unable to quantitatively assess the failure probability of the level control system.

[0004] Therefore, developing an aging test fixture that can simulate tens of thousands of operating cycles, has a high degree of automation, and can quantitatively evaluate the reliability of the liquid level control system has significant engineering application value and market prospects. Utility Model Content

[0005] The purpose of this invention is to provide an oil chromatography degassing tank aging test fixture to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An aging test fixture for an oil chromatography degassing tank includes: a main oil tank, a secondary oil tank, a vacuum pump, an oil pump, an inlet valve, an outlet valve, a venting valve, a pressure sensor, a level sensor, a control unit, and a power module.

[0008] The main oil tank and the auxiliary oil tank are connected by an oil circuit to form a closed-loop test system.

[0009] The oil flow path of the closed-loop test system is as follows: In the oil inlet stage, the oil starts from the auxiliary oil tank and enters the main oil tank through the oil inlet valve.

[0010] During the oil discharge phase, the oil flows from the main oil tank and returns to the auxiliary oil tank via the oil outlet valve and oil pump.

[0011] The venting valve, vacuum pump, and pressure sensor are installed on the main oil tank.

[0012] The liquid level sensor is provided in two sets, namely an upper liquid level sensor and a lower liquid level sensor, which are installed in the main oil tank at different heights.

[0013] The control unit, based on an MCU development board, receives signals from a pressure sensor and two sets of liquid level sensors, and controls the start and stop of the vacuum pump, oil pump, oil inlet valve, oil outlet valve, and venting valve to automatically execute continuous oil inlet and outlet test cycles.

[0014] As a further embodiment of this utility model: the power module converts 220V AC power into 24V and 5V DC power, which power the actuator and control unit respectively.

[0015] As a further embodiment of this utility model, the main oil tank and the auxiliary oil tank are made of transparent acrylic material.

[0016] As a further aspect of this utility model, the control unit realizes fully automatic cyclic control, including four stages: vacuuming, oil inlet, air breaking, and oil outlet.

[0017] As a further embodiment of this utility model, the oil inlet valve, oil outlet valve, and vent valve are all solenoid valves.

[0018] As a further improvement of this utility model, the control unit has a data recording function, which can record the action status of the liquid level sensor in each cycle.

[0019] Compared with the prior art, the beneficial effects of this utility model are: 1. Reliability quantitative assessment capability: Through tens of thousands of cycle tests, the number of times the liquid level sensor is falsely triggered or not triggered can be accurately recorded, the failure probability can be calculated, and data support can be provided for product improvement.

[0020] 2. Closed-loop oil circuit design: The oil is circulated between the main and auxiliary oil tanks, eliminating the need for an external oil source. This not only saves testing costs but also reduces oil consumption and environmental pollution.

[0021] 3. Transparent and visible structure: The main and auxiliary oil tanks are made of acrylic material, allowing testers to directly observe changes in the liquid level and the operation of the sensors, which facilitates fault diagnosis and process monitoring.

[0022] 4. High degree of automation control: Based on MCU program control, fully automatic cyclic testing is achieved, reducing manual intervention and improving testing efficiency and consistency.

[0023] 5. Simulates real working conditions: Through processes such as vacuuming, differential pressure oil inlet, and pump-driven oil discharge, the actual working process of the vacuum degassing device is highly replicated, making the test results more valuable for reference.

[0024] 6. Simple structure and low cost: It adopts conventional solenoid valves, sensors and development boards, and the manufacturing process is simple, making it easy to promote and use.

[0025] 7. Flexible parameter settings: Users can adjust parameters such as pressure threshold and delay time by modifying the program to adapt to the testing needs of different models of degassing tanks. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the tooling structure of an oil chromatography degassing tank aging test fixture according to the present invention.

[0027] Figure 2 This is a circuit diagram of an oil chromatography degassing tank aging test fixture according to the present invention.

[0028] Figure 3 This is a software operation flowchart of an oil chromatography degassing tank aging test fixture according to the present invention.

[0029] In the diagram: 1-Main oil tank, 2-Auxiliary oil tank, 3-Inlet valve, 4-Outlet valve, 5-Void breaker valve, 6-Oil pump, 7-Vacuum pump, 8-Pressure sensor, 9-Upper liquid level sensor, 10-Lower liquid level sensor. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model. The present utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0031] In one embodiment, see [reference] Figures 1-3An aging test fixture for an oil chromatography degassing tank includes: a main oil tank 1, a secondary oil tank 2, an inlet valve 3, an outlet valve 4, a venting valve 5, an oil pump 6, a vacuum pump 7, a pressure sensor 8, an upper liquid level sensor 9, a lower liquid level sensor 10, an air switch 11, a power module 12, and a control unit 13. The secondary oil tank 2 is connected to the main oil tank 1 via an oil pipeline. The inlet valve 3 is installed on the pipeline from the secondary oil tank 2 to the main oil tank 1. The outlet valve 4 and the oil pump 6 are installed on the pipeline from the main oil tank 1 to the secondary oil tank 2. The venting valve 5 is installed on the top of the main oil tank 1 to release atmospheric air and break the vacuum. The vacuum pump 7 is installed on the top of the main oil tank 1 to evacuate the main oil tank 1. The pressure sensor 8 is also installed on the top of the main oil tank 1 to detect the vacuum level inside the main oil tank 1. The upper liquid level sensor 9 and the lower liquid level sensor 10 are installed inside the main oil tank 1 to detect high and low liquid levels, respectively.

[0032] In one instance of this embodiment, please refer to Figures 1-3 The air switch, power module and control unit constitute the electrical control system. The control unit receives sensor signals and controls the actions of each actuator. The software operation process includes stages such as system initialization, vacuuming, oil inlet, air breaking and oil discharge, realizing fully automatic cyclic testing.

[0033] When the system is in operation, the air switch is first closed, and the power module outputs 24V and 5V DC power. The control unit is then powered on and runs the control program. After program initialization, the vacuum pump 7 is turned on to evacuate the main oil tank 1. The pressure sensor 8 monitors the internal pressure of the tank in real time. When the pressure is lower than a set threshold, such as 15kPa, the vacuum pump 7 is turned off and the oil inlet valve 3 is opened. Since the auxiliary oil tank 2 is open to the atmosphere, the main oil tank 1 is under vacuum. Under the action of pressure difference, the oil in the auxiliary oil tank 2 enters the main oil tank 1 through the oil inlet valve 3.

[0034] As oil enters, the level in the main oil tank 1 gradually rises, first triggering the lower level sensor 10, and then the upper level sensor 9. When the upper level sensor 9 is triggered, the program closes the inlet valve 3 and opens the vent valve 5, allowing the main oil tank 1 to communicate with the atmosphere and quickly restore normal pressure. After a 1-second delay, the outlet valve 4 is opened and the oil pump 6 is started to drain the oil in the main oil tank 1 back to the auxiliary oil tank 2.

[0035] As oil is discharged, the liquid level in the main oil tank 1 gradually decreases. The upper liquid level sensor 9 resets first, followed by the lower liquid level sensor 10. When the lower liquid level sensor 10 resets, the program shuts down the oil pump 6, the oil outlet valve 4, and the vent valve 5, completing one test cycle. The system automatically records the operation of the liquid level sensors during this cycle and determines whether any malfunctions, such as false triggering or failure to trigger, have occurred. Then the program restarts the next cycle, achieving continuous automated testing.

[0036] During testing, the system accumulates the number of loops and failures, and calculates the failure probability in real time using the formula P_fail=(N_fail / N_total)×100%. Users can view the test data and results through the host computer software or the local display screen.

[0037] In one instance of this embodiment, please refer to Figures 1-3 The oil inlet valve, oil outlet valve, and air breaker valve are all solenoid valves, which have the characteristics of fast response speed and high control accuracy.

[0038] In one instance of this embodiment, please refer to Figures 1-3 The main oil tank and the auxiliary oil tank are made of transparent acrylic material, which makes it easy to directly observe the changes in the liquid level inside the tank and the movement status of the sensor float.

[0039] In one instance of this embodiment, please refer to Figures 1-3 The control unit also includes a data recording function, which can record the triggering status of the liquid level sensor in each cycle in real time.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An aging test fixture for an oil chromatography degassing tank, characterized in that, include: Main oil tank, auxiliary oil tank, vacuum pump, oil pump, inlet valve, outlet valve, venting valve, pressure sensor, level sensor, control unit and power module; The main oil tank and the auxiliary oil tank are connected by an oil circuit to form a closed-loop test system. The oil flow path of the closed-loop test system is as follows: In the oil inlet stage, the oil starts from the auxiliary oil tank and enters the main oil tank through the oil inlet valve. During the oil discharge phase, the oil flows from the main oil tank and returns to the auxiliary oil tank via the oil outlet valve and oil pump. The venting valve, vacuum pump, and pressure sensor are installed on the main oil tank. The liquid level sensor is provided in two sets, namely an upper liquid level sensor and a lower liquid level sensor, which are installed in the main oil tank at different heights. The control unit, based on an MCU development board, receives signals from a pressure sensor and two sets of liquid level sensors, and controls the start and stop of the vacuum pump, oil pump, oil inlet valve, oil outlet valve, and venting valve to automatically execute continuous oil inlet and outlet test cycles.

2. The aging test fixture for an oil chromatography degassing tank according to claim 1, characterized in that, The main oil tank and the auxiliary oil tank are made of transparent acrylic material.

3. The aging test fixture for an oil chromatography degassing tank according to claim 1, characterized in that, The control unit achieves fully automatic cyclic control, including four stages: vacuuming, oil inlet, air breaking, and oil outlet.

4. The aging test fixture for an oil chromatography degassing tank according to claim 1, characterized in that, The control unit has a data logging function, which can record the operating status of the liquid level sensor in each cycle.

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