Self-adjustable sealing oil vacuum degree system

Abstract

The invention relates to the technical field of sealing oil vacuum degree, in particular to a self-adjustable sealing oil vacuum degree system which comprises a pressure detection module, a control logic module and a pneumatic control adjusting door module. The pressure detection module is used for detecting a pressure signal in the sealing oil vacuum oil tank in real time; the control logic module is used for analyzing the pressure signal and outputting a corresponding control signal based on a preset control mechanism; and the pneumatic control adjusting door module is arranged in front of a bypass door of the sealing oil vacuum pump and is opened and closed according to the control signal to adjust the vacuum degree of the sealing oil. Through cooperative work of pressure detection, control logic and the pneumatic control adjusting door module, real-time monitoring and automatic adjustment of the vacuum degree of the oil tank are achieved, hydrogen leakage and air entering are effectively prevented, and the operation safety of a generator is improved; manual operation is reduced, and labor cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of sealing oil vacuum technology, and more specifically to a self-adjustable sealing oil vacuum system. Background Technology

[0002] In hydrogen-cooled generators, the generator interior is filled with pressurized hydrogen. Hydrogen leakage from the air gap at the rotor shaft end poses a serious safety hazard. Furthermore, air entering the generator can contaminate the hydrogen, reduce cooling efficiency, and shorten the equipment's lifespan. To prevent hydrogen leakage, traditional gas turbine power plants typically employ a sealing oil system. Pressurized sealing oil is used to seal the generator shaft seals, thus preventing hydrogen leakage and air ingress.

[0003] The oil in the sealing oil system is the same as the lubricating oil for the turbine generator bearings, and during operation, the sealing oil inevitably comes into contact with air, resulting in some air dissolving in the oil. If the air content is too high, it can cause a decrease in the output of the sealing oil pump, damage to the oil seal, and even lead to safety accidents. Therefore, existing sealing oil systems are typically equipped with a vacuum oil purification device, which removes dissolved air by reducing the oil tank pressure to ensure the purity of the hydrogen in the system. The normal vacuum level of the vacuum oil tank is generally maintained between -20 kPa and -40 kPa. If the vacuum level is below -20 kPa, the gas in the oil cannot be effectively removed, triggering a low vacuum alarm and affecting the safe operation of the system.

[0004] However, the vacuum control of existing sealing oil systems mainly relies on on-site operation by patrol operators. The operator maintains the oil tank vacuum within a suitable range by starting the sealing oil vacuum pump and manually adjusting the bypass door opening. This method has the following drawbacks: firstly, operation depends on human experience, and improper operation by the patrol operator can lead to safety risks; secondly, the bypass door is usually located in an open area, making it susceptible to accidental external contact that can cause rapid changes in vacuum, increasing the risk of system fluctuations; furthermore, frequent manual operation increases operating labor costs. Summary of the Invention

[0005] (a) Purpose of the invention The purpose of this invention is to provide a self-adjustable sealing oil vacuum system. Through the coordinated operation of pressure detection, control logic, and a pneumatic control valve module, the system achieves real-time monitoring and automatic adjustment of the oil tank vacuum, effectively preventing hydrogen leakage and air ingress, improving generator operating safety, reducing manual operation, and lowering labor costs.

[0006] (II) Technical Solution To address the above problems, this invention provides a self-adjustable sealing oil vacuum system, comprising: a pressure detection module, a control logic module, and a pneumatic control regulating valve module; The pressure detection module is used to detect the pressure signal inside the sealing oil vacuum tank in real time and transmit the pressure signal to the control logic module. The control logic module is used to analyze the pressure signal, and based on the preset control mechanism, output the corresponding control signal and transmit the control signal to the pneumatic control valve module. The pneumatic control regulating door module is located in front of the bypass door of the sealing oil vacuum pump and is electrically connected to the control logic module. The pneumatic control regulating door module receives the control signal and opens and closes according to the control signal to adjust the sealing oil vacuum.

[0007] In another aspect of the present invention, preferably, the pressure detection module includes a pressure transmitter disposed on the top of the sealing oil vacuum tank, the pressure transmitter transmitting the detected pressure signal to the control logic module in analog or digital form.

[0008] In another aspect of the present invention, preferably, the control logic module includes a setting unit, a parsing unit, a comparison unit, and an output unit; The setting unit is used to automatically correct the target vacuum value based on historical operating data and vacuum change patterns; The analysis unit is used to analyze the pressure signal and obtain the real-time pressure value; The comparison unit is used to compare the real-time pressure value with the target vacuum value to obtain a comparison result. The output unit outputs a corresponding control signal based on the comparison result.

[0009] In another aspect of the present invention, preferably, the setting unit automatically corrects the target vacuum value based on historical operating data and vacuum variation patterns, including: Historical operating data of the sealing oil vacuum tank is periodically collected, including historical pressure values, pneumatic control valve opening, and system response time. Based on the historical operating data, analyze the vacuum change pattern and extract characteristic parameters such as vacuum fluctuation amplitude, response delay, and steady-state error. The correction coefficient is calculated based on the characteristic parameters to dynamically correct the set target vacuum value.

[0010] In another aspect of the present invention, preferably, the parsing unit parses the pressure signal to obtain a real-time pressure value, including: Receive pressure signals from the pressure detection module; The pressure signal is subjected to noise suppression and dynamic filtering, using a combination of moving average filtering and Kalman filtering to eliminate instantaneous fluctuations caused by pipeline pulsation or sensor error. The filtered signal is converted into a standardized real-time pressure value and transmitted to the comparison unit in digital form.

[0011] In another aspect of the present invention, preferably, the comparison unit compares the real-time pressure value with the target vacuum value to obtain a comparison result, including: When the real-time pressure value is greater than the target vacuum value, a first comparison signal is output to indicate that the vacuum is insufficient. When the real-time pressure value is less than the target vacuum value, a second comparison signal is output to indicate that the vacuum is too high; When the real-time pressure value equals the target vacuum value, a third comparison signal is output to indicate that the vacuum state is stable.

[0012] In another aspect of the present invention, preferably, the output unit outputs a corresponding control signal based on the comparison result, including: The first comparison signal corresponds to the first control signal. When the real-time pressure value is greater than the target vacuum value, the first control signal is used to drive the pneumatic control valve to increase its opening. The second comparison signal corresponds to the second control signal. When the real-time pressure value is less than the target vacuum value, the second control signal is used to drive the pneumatic control valve to reduce its opening. The third comparison signal corresponds to the third control signal. When the real-time pressure value is equal to the target vacuum value, the third control signal is used to maintain the current opening of the pneumatic control valve.

[0013] In another aspect of the present invention, preferably, the output unit is provided with a signal delay and anti-jitter mechanism. The signal delay and anti-shake mechanism includes: After receiving the control signal output by the comparison unit, the signal is transmitted after a preset delay time. The comparison results of multiple consecutive cycles are statistically analyzed and verified. When the control signal remains in the same state for several consecutive cycles, the control signal is output to the pneumatic control valve module.

[0014] In another aspect of the present invention, preferably, the pneumatic control regulating door module includes an electrical conversion unit and a pneumatic actuator unit; The electrical conversion unit is used to convert the control signal output by the control logic module into a pneumatic signal. The pneumatic actuator receives the pneumatic signal and drives the regulating door to perform opening and closing actions.

[0015] In another aspect of the present invention, preferably, the electrical conversion unit converts the control signal output by the control logic module into a pneumatic signal, including: Convert the digital control signals output by the control logic module into analog voltage or current signals; The analog signal is amplified and impedance matched to obtain an amplified analog signal; The amplified analog signal is converted into a corresponding pneumatic pressure signal, which drives the pneumatic actuator to adjust the opening of the pneumatic control valve.

[0016] (III) Beneficial Effects The above-described technical solution of the present invention has the following beneficial technical effects: This invention achieves real-time monitoring and automatic adjustment of the sealing oil vacuum tank pressure through the coordinated operation of a pressure detection module, a control logic module, and a pneumatic control regulating valve module. This ensures the tank vacuum level remains within a preset range, effectively preventing hydrogen leakage and air entry into the generator, thus guaranteeing the safe and stable operation of the hydrogen-cooled generator. It eliminates the need for frequent on-site operation of the bypass valve by operators, reducing the risk of human error and improving operational reliability. Through automated and intelligent control, it not only improves the accuracy of sealing oil vacuum control and ensures generator safety but also reduces manual intervention and operating costs, enhancing overall operating efficiency and management level. It possesses significant engineering application value and promising prospects for widespread adoption. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0019] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0021] The invention will now be described in more detail with reference to the accompanying drawings. In the various drawings, the same elements are indicated by similar reference numerals. For clarity, the various parts in the drawings are not drawn to scale.

[0022] Example 1 A self-adjustable sealing oil vacuum system. Figure 1A schematic diagram of the overall structure of an embodiment of the present invention is shown, as follows. Figure 1 As shown, it includes: a pressure detection module, a control logic module, and a pneumatic control valve module; The pressure detection module is used to detect the pressure signal inside the sealing oil vacuum tank in real time and transmit the pressure signal to the control logic module. A pressure transmitter, sensor, or similar device can be used to acquire the pressure signal inside the tank and transmit the signal to the control logic module in analog or digital form. The pressure detection module can be installed on the top of the tank or at a suitable location to ensure measurement accuracy. It can also be equipped with a filter or pressure stabilizing device to reduce interference from pipeline vibration or transient pulsations. In this embodiment, the pressure detection module includes a pressure transmitter installed on the top of the sealing oil vacuum tank, which transmits the detected pressure signal to the control logic module in analog or digital form.

[0023] The control logic module is used to analyze the pressure signal, output a corresponding control signal based on a preset control mechanism, and transmit the control signal to the pneumatic control valve module; in this embodiment, the control logic module includes a setting unit, an analysis unit, a comparison unit, and an output unit; The setting unit is used to automatically correct the target vacuum level value based on historical operating data and vacuum change patterns, including: Historical operating data of the sealing oil vacuum tank is periodically collected. The historical operating data includes historical pressure values, pneumatic control valve opening degree, and system response time. Pressure value records can be collected by a pressure transmitter, opening degree records can be obtained by a control valve position sensor, and system response time can be calculated by comparing the delay between the control command and the pressure change.

[0024] Based on the historical operating data, the vacuum variation pattern is analyzed, and characteristic parameters such as vacuum fluctuation amplitude, response delay, and steady-state error are extracted. After data acquisition, the setting unit analyzes the historical operating data to uncover the pattern of tank pressure changes with the action of the pneumatic control valve, and extracts key characteristic parameters, such as vacuum fluctuation amplitude, system response delay, and steady-state error. These characteristic parameters are used to describe the dynamic behavior of the tank under different operating conditions, thereby reflecting the system's performance trend and regulation characteristics.

[0025] The correction coefficient is calculated based on the aforementioned characteristic parameters to dynamically correct the set target vacuum value. Through continuous iterative calculation and updating, the target vacuum value can be automatically optimized according to changes in the system's operating state, achieving precise control and steady-state maintenance of the tank pressure. This self-learning mechanism can improve control accuracy, reduce overshoot or oscillation phenomena, and adapt to changes in operating conditions under different loads and environments, thereby enhancing the system's reliability and automation level.

[0026] The analysis unit is used to analyze the pressure signal and obtain a real-time pressure value, including: It receives pressure signals from the pressure detection module; the pressure signals can be in analog or digital form, reflecting the real-time pressure status inside the oil tank.

[0027] The pressure signal undergoes noise suppression and dynamic filtering, employing a combination of moving average filtering and Kalman filtering to eliminate instantaneous fluctuations caused by pipeline pulsation or sensor errors. To ensure signal accuracy, the analysis unit performs noise suppression and dynamic filtering on the received pressure signal. The filtering process combines moving average filtering and Kalman filtering, where moving average filtering smooths short-term random fluctuations, while Kalman filtering predicts and corrects dynamic changes in the signal, effectively suppressing pressure fluctuations caused by pipeline pulsation, sensor errors, or transient disturbances.

[0028] The filtered signal is converted into a standardized real-time pressure value and transmitted to the comparison unit in digital form. The resulting stable signal is then converted into a standardized real-time pressure value, unifying the signal units and format for further processing by the comparison unit.

[0029] The comparison unit is used to compare the real-time pressure value with the target vacuum value to obtain a comparison result. The comparison unit first receives the real-time pressure value and the target vacuum value, then performs numerical calculations to obtain the difference between the two. Based on the magnitude and direction of the difference, the comparison unit determines the current vacuum state, including: When the real-time pressure value is greater than the target vacuum value, a first comparison signal is output to indicate that the vacuum is insufficient. When the real-time pressure value is less than the target vacuum value, a second comparison signal is output to indicate that the vacuum is too high; When the real-time pressure value equals the target vacuum value, a third comparison signal is output to indicate that the vacuum state is stable.

[0030] The output unit outputs a corresponding control signal based on the comparison result, including: The first comparison signal corresponds to the first control signal. When the real-time pressure value is greater than the target vacuum value, the first control signal is used to drive the pneumatic control valve to increase its opening. The second comparison signal corresponds to the second control signal. When the real-time pressure value is less than the target vacuum value, the second control signal is used to drive the pneumatic control valve to reduce its opening. The third comparison signal corresponds to the third control signal. When the real-time pressure value is equal to the target vacuum value, the third control signal is used to maintain the current opening of the pneumatic control valve.

[0031] Furthermore, the output unit is equipped with a signal delay and anti-jitter mechanism. The signal delay and anti-shake mechanism includes: After receiving the control signal output by the comparison unit, the signal is transmitted after a preset delay time. The comparison results of multiple consecutive cycles are statistically analyzed and verified. When the control signal remains in the same state for several consecutive cycles, a control signal is output to the pneumatic control valve module. A signal delay and anti-jitter mechanism is implemented to prevent frequent switching of the control signal due to short-term pressure fluctuations or sensor errors, thereby ensuring the stability of the vacuum regulation process and the reliability of the system response. Specifically, after receiving the first, second, or third comparison signal from the comparison unit, the output unit does not immediately execute the corresponding control operation, but instead temporarily stores and buffers the signal according to a preset delay parameter. The delay time can be set according to system characteristics, vacuum response inertia, and the execution speed of the pneumatic control valve, typically between 0.5 and 5 seconds, to ensure the physical authenticity and stability of the signal.

[0032] During the delay period, the output unit statistically analyzes and verifies the comparison results across multiple consecutive sampling cycles. For example, if the system detects the same type of comparison signal for three or more consecutive cycles (such as continuously outputting the first comparison signal), the output unit confirms the state as a valid signal and outputs the corresponding control command to the pneumatic control valve module to execute the adjustment operation. If a signal change is detected during the delay or statistical period (such as switching from the first signal to the third signal), the output unit will re-time and statistically analyze the data to avoid triggering erroneous adjustment actions due to instantaneous fluctuations.

[0033] Through this signal delay and anti-jitter mechanism, the output unit can effectively suppress false signals caused by gas disturbances in the vacuum tank, pipeline pulsations, or instantaneous sensor jitters, ensuring stable output of control commands and avoiding mechanical fatigue and vacuum fluctuations caused by frequent opening and closing of the pneumatic control valve, thereby improving the control accuracy and operational reliability of the system.

[0034] The pneumatically controlled regulating door module is located in front of the bypass door of the sealing oil vacuum pump and is electrically connected to the control logic module. The pneumatically controlled regulating door module receives the control signal and opens and closes according to the control signal to adjust the sealing oil vacuum. The pneumatically controlled regulating door module includes an electrical conversion unit and a pneumatic actuator unit. The electrical conversion unit is used to convert the control signal output by the control logic module into a pneumatic signal, including: Convert the digital control signals output by the control logic module into analog voltage or current signals; The analog signal is amplified and impedance matched to obtain an amplified analog signal; The amplified analog signal is converted into a corresponding pneumatic pressure signal, driving the pneumatic actuator to adjust the opening of the pneumatic control valve. To ensure signal strength and transmission stability, the electrical conversion unit is equipped with a signal amplification circuit and an impedance matching circuit to amplify and filter the analog signal, eliminating signal distortion caused by line noise or transmission interference. The amplified analog signal is then converted into a pneumatic pressure signal proportional to the amplitude of the control command by an electro-pneumatic converter (I / P Converter) and output to the pneumatic actuator. This conversion process achieves a precise correspondence between digital logic control and physical pneumatic action, making the system response fast and linearly controllable.

[0035] The pneumatic actuator receives the pneumatic signal and drives the regulating gate to perform opening and closing actions. The regulating gate is driven to open and close via an internal pneumatic drive mechanism (such as a diaphragm actuator or a piston actuator). Based on the magnitude of the air pressure signal, the regulating gate can achieve continuously adjustable opening to refine vacuum control.

[0036] This invention achieves real-time monitoring and automatic adjustment of the sealing oil vacuum tank pressure through the coordinated operation of a pressure detection module, a control logic module, and a pneumatic control regulating valve module. This ensures the tank vacuum level remains within a preset range, effectively preventing hydrogen leakage and air entry into the generator, thus guaranteeing the safe and stable operation of the hydrogen-cooled generator. It eliminates the need for frequent on-site operation of the bypass valve by operators, reducing the risk of human error and improving operational reliability. Through automated and intelligent control, it not only improves the accuracy of sealing oil vacuum control and ensures generator safety but also reduces manual intervention and operating costs, enhancing overall operating efficiency and management level. It possesses significant engineering application value and promising prospects for widespread adoption.

[0037] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

[0038] The present invention has been described above with reference to embodiments thereof. However, these embodiments are merely illustrative and not intended to limit the scope of the invention. The scope of the invention is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of the invention, and all such substitutions and modifications should fall within the scope of the invention.

[0039] Although embodiments of the present invention have been described in detail, it should be understood that various changes, substitutions, and modifications can be made to the embodiments of the present invention without departing from the spirit and scope of the invention.

[0040] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A self-adjustable sealing oil vacuum system, characterized in that, include: Pressure detection module, control logic module, and pneumatic control valve module; The pressure detection module is used to detect the pressure signal inside the sealing oil vacuum tank in real time and transmit the pressure signal to the control logic module. The control logic module is used to analyze the pressure signal, and based on the preset control mechanism, output the corresponding control signal and transmit the control signal to the pneumatic control valve module. The pneumatic control regulating door module is located in front of the bypass door of the sealing oil vacuum pump and is electrically connected to the control logic module. The pneumatic control regulating door module receives the control signal and opens and closes according to the control signal to adjust the sealing oil vacuum.

2. The self-adjustable sealing oil vacuum system according to claim 1, characterized in that, The pressure detection module includes a pressure transmitter installed on the top of the sealing oil vacuum tank. The pressure transmitter transmits the detected pressure signal to the control logic module in analog or digital form.

3. The self-adjustable sealing oil vacuum system according to claim 1, characterized in that, The control logic module includes a setting unit, a parsing unit, a comparison unit, and an output unit; The setting unit is used to automatically correct the target vacuum value based on historical operating data and vacuum change patterns; The analysis unit is used to analyze the pressure signal and obtain the real-time pressure value; The comparison unit is used to compare the real-time pressure value with the target vacuum value to obtain a comparison result. The output unit outputs a corresponding control signal based on the comparison result.

4. The self-adjustable sealing oil vacuum system according to claim 3, characterized in that, The setting unit automatically corrects the target vacuum level value based on historical operating data and vacuum variation patterns, including: Historical operating data of the sealing oil vacuum tank is periodically collected, including historical pressure values, pneumatic control valve opening, and system response time. Based on the historical operating data, analyze the vacuum change pattern and extract characteristic parameters such as vacuum fluctuation amplitude, response delay, and steady-state error. The correction coefficient is calculated based on the characteristic parameters to dynamically correct the set target vacuum value.

5. The self-adjustable sealing oil vacuum system according to claim 3, characterized in that, The analysis unit analyzes the pressure signal to obtain a real-time pressure value, including: Receive pressure signals from the pressure detection module; The pressure signal is subjected to noise suppression and dynamic filtering, using a combination of moving average filtering and Kalman filtering to eliminate instantaneous fluctuations caused by pipeline pulsation or sensor error. The filtered signal is converted into a standardized real-time pressure value and transmitted to the comparison unit in digital form.

6. The self-adjustable sealing oil vacuum system according to claim 3, characterized in that, The comparison unit compares the real-time pressure value with the target vacuum value to obtain a comparison result, including: When the real-time pressure value is greater than the target vacuum value, a first comparison signal is output to indicate that the vacuum is insufficient. When the real-time pressure value is less than the target vacuum value, a second comparison signal is output to indicate that the vacuum is too high; When the real-time pressure value equals the target vacuum value, a third comparison signal is output to indicate that the vacuum state is stable.

7. The self-adjustable sealing oil vacuum system according to claim 6, characterized in that, The output unit outputs a corresponding control signal based on the comparison result, including: The first comparison signal corresponds to the first control signal. When the real-time pressure value is greater than the target vacuum value, the first control signal is used to drive the pneumatic control valve to increase its opening. The second comparison signal corresponds to the second control signal. When the real-time pressure value is less than the target vacuum value, the second control signal is used to drive the pneumatic control valve to reduce its opening. The third comparison signal corresponds to the third control signal. When the real-time pressure value is equal to the target vacuum value, the third control signal is used to maintain the current opening of the pneumatic control valve.

8. The self-adjustable sealing oil vacuum system according to claim 7, characterized in that, The output unit is equipped with a signal delay and anti-jitter mechanism. The signal delay and anti-shake mechanism includes: After receiving the control signal output by the comparison unit, the signal is transmitted after a preset delay time. The comparison results of multiple consecutive cycles are statistically analyzed and verified. When the control signal remains in the same state for several consecutive cycles, the control signal is output to the pneumatic control valve module.

9. The self-adjustable sealing oil vacuum system according to claim 1, characterized in that, The pneumatically controlled regulating gate module includes an electrical conversion unit and a pneumatic actuator unit; The electrical conversion unit is used to convert the control signal output by the control logic module into a pneumatic signal. The pneumatic actuator receives the pneumatic signal and drives the regulating door to perform opening and closing actions.

10. The self-adjustable sealing oil vacuum system according to claim 9, characterized in that, The electrical conversion unit converts the control signal output by the control logic module into a pneumatic signal, including: Convert the digital control signals output by the control logic module into analog voltage or current signals; The analog signal is amplified and impedance matched to obtain an amplified analog signal; The amplified analog signal is converted into a corresponding pneumatic pressure signal, which drives the pneumatic actuator to adjust the opening of the pneumatic control valve.

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