An intelligent control system and method for a liquid ring vacuum pump

Abstract

The present invention discloses an intelligent control system and method for a liquid ring vacuum pump, belonging to the technical field of intelligent control of vacuum pumps. The system includes an equipment control module, a collection and monitoring module, a database, a target confirmation module, an intelligent analysis and calculation module, a compensation control module, and an interaction module; the equipment control module is used to control the start or stop of the liquid ring vacuum pump; the collection and monitoring module is used to collect status data; the database is used to store historical data; the target confirmation module is used to determine the target pressure of the vacuum chamber and the time required to reach the target pressure requirement; the intelligent analysis and calculation module is used to establish a gas pumping speed analysis model to analyze the influence of different impeller speeds and gas pressures on the gas extraction rate in the vacuum chamber; the compensation control module is used to calculate the impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment and perform control adjustment on the liquid ring vacuum pump; the interaction module is used to provide a man-machine interaction platform for digital display.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent control of vacuum pumps, and particularly to an intelligent control system and method for liquid ring vacuum pumps. Background Technique

[0002] A liquid ring vacuum pump is a vacuum pump that uses liquid as the sealing and working medium; its working principle is based on the gas compression effect generated by centrifugal force. The liquid is thrown out by the rotating impeller to form a liquid ring, and at the same time, the working chamber formed between the liquid ring and the pump body changes continuously during the rotation of the impeller, so as to realize the suction, compression and discharge of gas; in the chemical industry, liquid ring vacuum pumps are commonly used in process processes such as vacuum distillation and vacuum drying. Through intelligent control, precise control of these process processes can be achieved.

[0003] Through the built-in sensors, the intelligent control system can monitor the operating state of the liquid ring vacuum pump in real time, so as to adjust the operating parameters of the liquid ring vacuum pump in real time and improve the management efficiency; however, during the process of the liquid ring vacuum pump extracting the gas in the vacuum chamber, due to the influence of gas pressure, as the gas in the vacuum chamber is continuously extracted, at the same impeller speed, the gas volume extracted by the liquid ring vacuum pump will continuously decrease. In the existing technology for the intelligent control of liquid ring vacuum pumps, it is difficult to adaptively adjust the impeller speed of the liquid ring vacuum pump according to the change of gas pressure in the vacuum chamber, so that the vacuum chamber cannot reach the required vacuum effect within the specified time, affecting the work efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide an intelligent control system and method for liquid ring vacuum pumps to solve the problems raised in the above background technique.

[0005] To solve the above technical problems, the present invention provides the following technical solution: An intelligent control system for a liquid ring vacuum pump, the system includes an equipment control module, a collection and monitoring module, a database, a target confirmation module, an intelligent analysis and calculation module, a compensation control module and an interaction module;

[0006] The equipment control module is used to control the start or stop of the liquid ring vacuum pump; send the start or stop signal of the liquid ring vacuum pump to the collection and monitoring module;

[0007] The collection and monitoring module is used to collect the state data during the operation of the liquid ring vacuum pump; the state data includes the impeller speed in the liquid ring vacuum pump, the gas pressure and temperature in the vacuum chamber; send the collected state data to the database and the interaction module; send the collected gas pressure and temperature in the vacuum chamber to the target confirmation module;

[0008] The database is used to store the collected status data as historical data and continuously update the collected status data; send the collected status data to the intelligent analysis and calculation module;

[0009] The target confirmation module is used to determine the volume of the vacuum chamber, determine the number of moles of gas in the vacuum chamber according to the gas pressure and temperature in the vacuum chamber; determine the target pressure of the vacuum chamber and the required time to reach the target pressure; the target pressure represents the gas pressure required for the vacuum chamber; send the number of moles of gas in the vacuum chamber, the target pressure of the vacuum chamber, and the required time to reach the target pressure to the compensation control module;

[0010] The intelligent analysis and calculation module is used to analyze the historical status data stored in the database, establish a gas pumping speed analysis model, and analyze the influence of different impeller speeds and gas pressures on the gas extraction rate in the vacuum chamber;

[0011] The compensation control module is used to analyze the currently collected status data, determine the impeller speed in the current liquid ring vacuum pump, the gas pressure and temperature in the current vacuum chamber, and calculate the impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment according to the established gas pumping speed analysis model, and control and adjust the liquid ring vacuum pump according to the calculation result until the target pressure of the vacuum chamber is reached; send the calculated impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment to the interaction module;

[0012] The interaction module is used to provide a human-machine interaction platform; the human-machine interaction platform is used to digitally display the calculated impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment and the collected status data.

[0013] An intelligent control method for a liquid ring vacuum pump, the method comprising the following steps:

[0014] S10. Start the liquid ring vacuum pump; collect the status data during the operation of the liquid ring vacuum pump, store the collected status data as historical data in the database, and continuously update the database; the status data includes the impeller speed in the liquid ring vacuum pump, the gas pressure and temperature in the vacuum chamber;

[0015] S20. Determine the volume of the vacuum chamber, determine the number of moles of gas in the vacuum chamber according to the gas pressure and temperature in the vacuum chamber; determine the target pressure of the vacuum chamber and the required time to reach the target pressure;

[0016] S30. Analyze the historical status data stored in the database, determine the gas extraction rate in the vacuum chamber in different historical status data according to the number of moles of gas in the vacuum chamber, establish a gas pumping speed analysis model, and analyze the influence of different impeller speeds and gas pressures on the gas extraction rate in the vacuum chamber;

[0017] S40. Analyze the currently collected status data to determine the impeller speed in the current liquid ring vacuum pump, the gas pressure and temperature in the current vacuum chamber. According to the target pressure of the vacuum chamber, the required time to reach the target pressure, the established gas pumping speed analysis model, the impeller speed in the current liquid ring vacuum pump, the gas pressure and temperature in the current vacuum chamber, calculate the impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment, and control and adjust the liquid ring vacuum pump according to the calculation result until the target pressure of the vacuum chamber is reached.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: By establishing a gas pumping speed analysis model, analyzing the influence of different impeller speeds and gas pressures on the gas extraction rate in the vacuum chamber, calculating the impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment according to the analysis result, and controlling and adjusting the liquid ring vacuum pump, the adaptive ability of the intelligent control system is improved; at the same time, the gas pressure in the vacuum chamber reaches the target effect within the specified time, improving the operation efficiency and control ability of the intelligent control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of an intelligent control system for a liquid ring vacuum pump according to the present invention;

[0020] Figure 2 is a schematic step diagram of an intelligent control method for a liquid ring vacuum pump according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to Figure 1-2 , the present invention provides the following technical solutions:

[0023] Please refer to Figure 1 , in the first embodiment: An intelligent control system for a liquid ring vacuum pump is provided. The liquid ring vacuum pump is an embedded liquid ring vacuum pump and is used for vacuum filtration in the chemical industry; using the vacuum environment provided by the liquid ring vacuum pump, solid particles in the suspension are separated by vacuum suction. Since the vacuum filtration process requires rapid and effective separation of solid particles and liquid, strict control of time efficiency is required; the system includes an equipment control module, a collection and monitoring module, a database, a target confirmation module, an intelligent analysis and calculation module, a compensation control module, and an interaction module;

[0024] The device control module is used to control the start or stop of the liquid ring vacuum pump; and send the start or stop signal of the liquid ring vacuum pump to the acquisition and monitoring module.

[0025] The acquisition and monitoring module is used to acquire the status data during the operation of the liquid ring vacuum pump; the status data includes the impeller speed in the liquid ring vacuum pump, the gas pressure and temperature in the vacuum chamber; send the acquired status data to the database and the interaction module; send the acquired gas pressure and temperature in the vacuum chamber to the target confirmation module.

[0026] It should be noted that the inlet of the liquid ring vacuum pump is connected to the vacuum chamber, which is used to extract the gas in the vacuum chamber, change the gas pressure, and thus create a vacuum environment; the vacuum chamber represents the vacuum environment where the liquid ring vacuum pump acts.

[0027] The database is used to store the acquired status data as historical data and continuously update the acquired status data; send the acquired status data to the intelligent analysis and calculation module.

[0028] The target confirmation module is used to determine the volume of the vacuum chamber, determine the number of moles of gas in the vacuum chamber according to the gas pressure and temperature in the vacuum chamber; determine the target pressure of the vacuum chamber and the required time to reach the target pressure; the target pressure represents the gas pressure required for the vacuum chamber to reach; send the number of moles of gas in the vacuum chamber, the target pressure of the vacuum chamber and the required time to reach the target pressure to the compensation control module.

[0029] In this embodiment, according to the chemical reaction time, production amount and production efficiency of the material, the target pressure of the vacuum chamber and the required time to reach the target pressure are determined. When the chemical reaction time of the material is faster, the required time to reach the target pressure is shorter, and the more the production amount of the material, the smaller the target pressure of the corresponding vacuum chamber. By determining the target pressure of the vacuum chamber and the required time to reach the target pressure, the vacuum filtration link of the material can be strictly controlled, the production cycle can be shortened, and the overall production efficiency can be improved; since the liquid ring vacuum pump extracts the gas in the vacuum chamber, the number of moles of gas changes, and the volume of the vacuum chamber remains unchanged, so the number of moles of gas in the vacuum chamber can be obtained according to the ideal gas state equation and the gas pressure in the vacuum chamber.

[0030] Furthermore, the target confirmation module includes a parameter confirmation unit and an efficiency confirmation unit;

[0031] The parameter confirmation unit is used to determine the volume of the vacuum chamber; determine the gas pressure and temperature in the vacuum chamber; obtain the number of moles of gas in the vacuum chamber according to the ideal gas state equation;

[0032] The efficiency confirmation unit is used to determine the target pressure of the vacuum chamber and the required duration to reach the target pressure according to the chemical reaction time and production amount of the material.

[0033] The intelligent analysis and calculation module is used to analyze the historical status data stored in the database, establish a gas pumping speed analysis model, and analyze the influence of different impeller speeds and gas pressures on the gas extraction rate in the vacuum chamber.

[0034] Furthermore, the intelligent analysis and calculation module includes a historical data analysis unit, a gas rate analysis unit, and a model management unit;

[0035] The historical data analysis unit is used to analyze the historical status data stored in the database, determine the impeller speed in the liquid ring vacuum pump, the gas pressure and temperature in the vacuum chamber at different historical timestamps, and determine the number of moles of gas in the vacuum chamber at different historical timestamps according to the ideal gas state equation; send the determined impeller speed in the liquid ring vacuum pump and the gas pressure in the vacuum chamber to the model management unit; send the determined number of moles of gas in the vacuum chamber to the gas rate analysis unit;

[0036] The gas rate analysis unit is used to determine the gas extraction rate in the vacuum chamber at different historical timestamps according to the determined number of moles of gas in the vacuum chamber; send the determined gas extraction rate in the vacuum chamber to the model management unit;

[0037] The model management unit is used to establish a gas pumping speed analysis model, take the impeller speed in the liquid ring vacuum pump and the gas pressure in the vacuum chamber as independent variables, and take the gas extraction rate in the vacuum chamber as the dependent variable, and analyze the influence of different impeller speeds and gas pressures on the gas extraction rate in the vacuum chamber.

[0038] The compensation control module is used to analyze the currently collected status data, determine the impeller speed in the current liquid ring vacuum pump, the gas pressure and temperature in the current vacuum chamber, and calculate the impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment according to the established gas pumping speed analysis model, and control and adjust the liquid ring vacuum pump according to the calculation result until the target pressure of the vacuum chamber is reached; send the calculated impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment to the interaction module.

[0039] Furthermore, the compensation control module includes a collected data analysis unit, an impeller speed calculation unit, and an intelligent control unit;

[0040] The collected data analysis unit is used to analyze the currently collected status data, determine the impeller speed in the liquid ring vacuum pump, the gas pressure and temperature in the vacuum chamber at the current timestamp; and send the determined impeller speed in the current liquid ring vacuum pump, the gas pressure and temperature in the vacuum chamber to the impeller speed calculation unit;

[0041] The impeller speed calculation unit is used to calculate the impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment according to the target pressure of the vacuum chamber, the time required to reach the target pressure requirement, the established gas pumping speed analysis model, the impeller speed in the current liquid ring vacuum pump, the gas pressure and temperature in the vacuum chamber; and send the calculated impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment to the intelligent control unit;

[0042] The intelligent control unit is used to control and adjust the liquid ring vacuum pump according to the calculated impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment until the target pressure of the vacuum chamber is reached.

[0043] The interaction module is used to provide a human-machine interaction platform; the human-machine interaction platform is used to digitally display the calculated impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment and the collected status data.

[0044] Further, the interaction module includes a digital display unit and a user control unit;

[0045] The digital display unit is used to digitally display the calculated impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment and the collected status data;

[0046] The user control unit is used for the user to manually directly confirm the target pressure of the vacuum chamber and the time required to reach the target pressure requirement, and send the user's manually directly confirmed information to the target confirmation module.

[0047] In this embodiment:

[0048] An embedded liquid ring vacuum pump provides a vacuum environment for the process production in the chemical industry, extracts the gas in the vacuum chamber, and the equipment control module controls the start of the liquid ring vacuum pump and sends the liquid ring vacuum pump start signal to the acquisition and monitoring module;

[0049] The acquisition and monitoring module acquires the status data during the operation of the liquid ring vacuum pump, sends the acquired status data to the database and the interaction module; and sends the acquired gas pressure and temperature in the vacuum chamber to the target confirmation module;

[0050] The database stores the acquired status data as historical data and continuously updates the acquired status data; and sends the acquired status data to the intelligent analysis and calculation module;

[0051] The parameter confirmation unit in the target confirmation module determines the volume of the vacuum chamber, and according to the ideal gas state equation, obtains the number of moles of gas in the vacuum chamber; the efficiency confirmation unit determines the target pressure of the vacuum chamber and the required time to reach the target pressure; sends the number of moles of gas in the vacuum chamber, the target pressure of the vacuum chamber, and the required time to reach the target pressure to the compensation control module;

[0052] The historical data analysis unit in the intelligent analysis and calculation module sends the determined impeller speed in the liquid ring vacuum pump and the gas pressure in the vacuum chamber to the model management unit; sends the determined number of moles of gas in the vacuum chamber to the gas rate analysis unit; the gas rate analysis unit sends the determined gas extraction rate in the vacuum chamber to the model management unit; the model management unit establishes a gas pumping speed analysis model to analyze the influence of different impeller speeds and gas pressures on the gas extraction rate in the vacuum chamber;

[0053] The acquisition data analysis unit in the compensation control module sends the determined current impeller speed in the liquid ring vacuum pump, the gas pressure and temperature in the vacuum chamber to the impeller speed calculation unit; the impeller speed calculation unit sends the calculated impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment to the intelligent control unit; the intelligent control unit controls and adjusts the liquid ring vacuum pump according to the calculated impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment until the target pressure of the vacuum chamber is reached; the calculated impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment is sent to the interaction module; wherein, when the target pressure of the vacuum chamber is reached, the liquid ring vacuum pump is turned off;

[0054] The interaction module provides a man-machine interaction platform, and digitally displays the calculated impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment and the collected status data through the digital display unit; wherein, when the user manually directly confirms the target pressure of the vacuum chamber and the required time to reach the target pressure through the user control unit, the user's manually directly confirmed information is sent to the target confirmation module, and at this time, the user's manually directly confirmed information is used as the target pressure of the vacuum chamber and the required time to reach the target pressure;

[0055] The equipment control module controls the liquid ring vacuum pump to turn off, sends the liquid ring vacuum pump turn-off signal to the acquisition and monitoring module, and stops the acquisition of status data.

[0056] Please refer to Figure 2 In the second embodiment, a method for intelligent control of a liquid ring vacuum pump is provided, and the method includes the following steps:

[0057] S10. Start the liquid ring vacuum pump; collect the status data during the operation of the liquid ring vacuum pump, store the collected status data as historical data in the database, and continuously update the database; the status data includes the impeller speed in the liquid ring vacuum pump, the gas pressure and temperature in the vacuum chamber.

[0058] S20. Determine the volume of the vacuum chamber, and determine the number of moles of the gas in the vacuum chamber according to the gas pressure and temperature in the vacuum chamber; determine the target pressure of the vacuum chamber and the required time to reach the target pressure.

[0059] Specifically, the method for determining the number of moles of the gas in the vacuum chamber according to the gas pressure and temperature in the vacuum chamber is as follows: determine the volume of the vacuum chamber ; and determine the gas pressure in the vacuum chamber and temperature ; according to and , obtain the number of moles of the gas in the vacuum chamber , according to the ideal gas state equation: ; where represents the ideal gas constant.

[0060] In this embodiment, the ideal gas constant is a fixed value, .

[0061] S30. Analyze the historical state data stored in the database, determine the gas extraction rate in the vacuum chamber in different historical state data according to the number of moles of the gas in the vacuum chamber, establish a gas pumping speed analysis model, and analyze the influence of different impeller speeds and gas pressures on the gas extraction rate in the vacuum chamber.

[0062] In this embodiment, due to the influence of the gas pressure in the vacuum chamber, as the gas in the vacuum chamber is extracted, the collision between gas molecules decreases, resulting in a decrease in the gas pumping efficiency in the vacuum chamber. Increasing the impeller speed in the liquid ring vacuum pump can increase the gas extraction rate in the vacuum chamber. Therefore, by establishing a gas pumping speed analysis model and analyzing the influence of different impeller speeds and gas pressures on the gas extraction rate in the vacuum chamber, the impeller speed in the liquid ring vacuum pump is intelligently controlled, improving the accuracy and adaptive ability of the intelligent control system.

[0063] Specifically, the method steps are as follows:

[0064] S301. Analyze the historical state data stored in the database, and determine the impeller speed in the liquid ring vacuum pump, the gas pressure in the vacuum chamber, and the temperature at different historical timestamps ; according to and the ideal gas state equation, determine the number of moles of the gas in the vacuum chamber at different historical timestamps ; according to , determine different historical timestamps At this time, the gas extraction rate in the vacuum chamber : ; Among them, represents the number of moles of gas in the vacuum chamber at time; represents the time step;

[0065] S302. Establish a gas extraction rate analysis model, taking the impeller speed in the liquid ring vacuum pump and the gas pressure in the vacuum chamber as independent variables, and taking the gas extraction rate in the vacuum chamber as the dependent variable, analyze the influence of different impeller speeds and gas pressures on the gas extraction rate in the vacuum chamber. According to the calculation formula:

[0066] ;

[0067] Among them, and are both normal constants, and ;

[0068] S303. Substitute the values of and into the calculation formula in step S302 respectively, perform curve fitting according to the least squares method, find the best curve and determine the and values.

[0069] It should be noted that according to the least squares method for curve fitting, is used as the training parameter; is used as the training parameter; is used as the training parameter; Substitute it into the curve function calculation formula in step S302 to fit the curve under different and values, so that the sum of the squares of the distances of the corresponding and value points is the smallest under different values, and take this curve as the best curve to determine the and values in the best curve.

[0070] S40. Analyze the currently collected status data to determine the impeller speed in the current liquid ring vacuum pump, the gas pressure and temperature in the current vacuum chamber. According to the target pressure of the vacuum chamber, the required time duration to reach the target pressure, the established gas pumping speed analysis model, the impeller speed in the current liquid ring vacuum pump, the gas pressure and temperature in the current vacuum chamber, calculate the impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment, and control and adjust the liquid ring vacuum pump according to the calculation result until the target pressure of the vacuum chamber is reached.

[0071] In this implementation, the impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment is continuously calculated and the impeller speed is controlled to make the gas pressure in the vacuum chamber reach the target effect within the specified time, improving the operation efficiency and control ability of the intelligent control system.

[0072] Specifically, the method steps are as follows:

[0073] S401. Analyze the currently collected status data to determine the current timestamp at which the impeller speed in the liquid ring vacuum pump , the gas pressure in the vacuum chamber and the temperature ;

[0074] S402. According to the target pressure of the vacuum chamber, the required time duration to reach the target pressure, the established gas pumping speed analysis model, and , calculate the impeller speed of the liquid ring vacuum pump that needs to be adjusted at the moment:

[0075] ;

[0076] Among them, represents the number of moles of gas under the target pressure of the vacuum chamber, ; represents the number of moles of gas in the vacuum chamber at the moment, represents the required time duration to reach the target pressure at the

[0077] S403. Adjust the impeller speed of the liquid ring vacuum pump at the moment to , until the target pressure of the vacuum chamber is reached, completing the control task of the liquid ring vacuum pump.

[0078] It should be noted that as time goes by, the required time duration It is also continuously decreasing; since the gas temperature in the vacuum chamber does not change significantly during the process of the liquid ring vacuum pump extracting gas from the vacuum chamber, the influence of temperature change is not considered during the control process of the impeller speed of the liquid ring vacuum pump.

[0079] In this embodiment, the control task of the liquid ring vacuum pump means controlling the liquid ring vacuum pump to pump air from the vacuum chamber and making the vacuum chamber reach the target pressure within the required time; the steps S10 - S40 are the process of completing a control task of the liquid ring vacuum pump; the vacuum chamber includes an air inlet device. When chemical production is carried out, the air inlet device is closed to prevent external gas from entering, and the steps S10 - S40 are repeated; when chemical production is completed, the liquid ring vacuum pump is closed and the air inlet device is opened to allow external gas to enter.

[0080] Finally, it should be noted that: The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An intelligent control system for a liquid ring vacuum pump, characterized in that: The system includes an equipment control module, an acquisition monitoring module, a database, a target confirmation module, an intelligent analysis and calculation module, a compensation control module and an interaction module; The equipment control module is used to control the start or shut down of the liquid ring vacuum pump; and send the start or shut down signal of the liquid ring vacuum pump to the acquisition monitoring module; The acquisition monitoring module is used to collect status data of the liquid ring vacuum pump during operation; the status data includes the impeller speed of the liquid ring vacuum pump, the gas pressure and temperature in the vacuum chamber; the collected status data is sent to the database and the interaction module; the collected gas pressure and temperature in the vacuum chamber are sent to the target confirmation module; The database is used to store the collected status data as historical data and continuously update the collected status data; and send the collected status data to the intelligent analysis and calculation module; The target confirmation module is used to determine the volume of the vacuum chamber, determine the number of moles of gas in the vacuum chamber according to the gas pressure and temperature in the vacuum chamber; determine the target pressure of the vacuum chamber and the required time to reach the target pressure; the target pressure represents the gas pressure that the vacuum chamber needs to reach; send the number of moles of gas in the vacuum chamber, the target pressure of the vacuum chamber and the required time to reach the target pressure to the compensation control module; The intelligent analysis and calculation module is used to analyze the historical state data stored in the database, establish a gas pumping speed analysis model, and analyze the influence of different impeller speeds and gas pressures on the gas extraction rate in the vacuum chamber; The intelligent analysis and calculation module includes a historical data analysis unit, a gas rate analysis unit and a model management unit; The historical data analysis unit is used to analyze the historical state data stored in the database, determine the impeller speed in the liquid ring vacuum pump, the gas pressure and temperature in the vacuum chamber at different historical time stamps, and determine the number of moles of gas in the vacuum chamber at different historical time stamps according to the ideal gas state equation; send the determined impeller speed in the liquid ring vacuum pump and the gas pressure in the vacuum chamber to the model management unit; send the determined number of moles of gas in the vacuum chamber to the gas rate analysis unit; The gas rate analysis unit is used to determine the gas extraction rate in the vacuum chamber at different historical time stamps according to the determined number of moles of gas in the vacuum chamber; and send the determined gas extraction rate in the vacuum chamber to the model management unit; The model management unit is used to establish a gas pumping speed analysis model, taking the impeller speed in the liquid ring vacuum pump and the gas pressure in the vacuum chamber as independent variables, and taking the gas extraction rate in the vacuum chamber as a dependent variable, to analyze the influence of different impeller speeds and gas pressures on the gas extraction rate in the vacuum chamber; The compensation control module includes a data collection and analysis unit, an impeller speed calculation unit and an intelligent control unit; The collected data analysis unit is used to analyze the currently collected state data to determine the impeller speed in the liquid ring vacuum pump, the gas pressure and temperature in the vacuum chamber at the current timestamp; send the determined impeller speed in the current liquid ring vacuum pump, the gas pressure and temperature in the vacuum chamber to the impeller speed calculation unit; The impeller speed calculation unit is used to calculate the impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment according to the target pressure of the vacuum chamber, the required time to reach the target pressure, the established gas pumping speed analysis model, the impeller speed in the current liquid ring vacuum pump, and the gas pressure and temperature in the vacuum chamber; and send the calculated impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment to the intelligent control unit; The intelligent control unit is used to control and adjust the liquid ring vacuum pump according to the calculated liquid ring vacuum pump impeller speed that needs to be adjusted at the next moment until the target pressure of the vacuum chamber is reached; The compensation control module is used to analyze the currently collected state data, determine the current impeller speed in the liquid ring vacuum pump, the gas pressure and temperature in the current vacuum chamber, and calculate the impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment according to the established gas pumping speed analysis model, and control and adjust the liquid ring vacuum pump according to the calculation result until the target pressure of the vacuum chamber is reached; send the calculated impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment to the interaction module; The interactive module is used to provide a human-computer interaction platform; the human-computer interaction platform is used to digitally display the liquid ring vacuum pump impeller speed that needs to be adjusted at the next moment of calculation and the collected status data.

2. According to claim 1, a liquid ring vacuum pump intelligent control system is characterized in that: The target confirmation module includes a parameter confirmation unit and an efficiency confirmation unit; The parameter confirmation unit is used to determine the volume of the vacuum chamber; determine the gas pressure and temperature in the vacuum chamber; and obtain the number of moles of gas in the vacuum chamber according to the ideal gas state equation; The efficiency confirmation unit is used to determine the target pressure of the vacuum chamber and the required time to reach the target pressure according to the chemical reaction time and the generated amount of the material.

3. The intelligent control system for a liquid ring vacuum pump according to claim 1, characterized in that: The interactive module includes a digital display unit and a user control unit; The digital display unit is used to digitally display the calculated liquid ring vacuum pump impeller speed that needs to be adjusted at the next moment and the collected status data; The user control unit is used for the user to manually and directly confirm the target pressure of the vacuum chamber and the required time to reach the target pressure, and send the user's manual direct confirmation information to the target confirmation module.

4. A liquid ring vacuum pump intelligent control method, using a liquid ring vacuum pump intelligent control system as described in any one of claims 1 to 3, characterized in that: The method comprises the following steps: S10, start the liquid ring vacuum pump; collect status data of the liquid ring vacuum pump during operation, store the collected status data in a database as historical data, and continuously update the database; the status data includes the impeller speed of the liquid ring vacuum pump, the gas pressure and temperature in the vacuum chamber; S20, determining the volume of the vacuum chamber, and determining the number of moles of gas in the vacuum chamber according to the gas pressure and temperature in the vacuum chamber; determining the target pressure of the vacuum chamber and the required time to reach the target pressure; S30, analyzing the historical state data stored in the database, determining the gas extraction rate in the vacuum chamber in different historical state data according to the molar number of the gas in the vacuum chamber, establishing a gas extraction rate analysis model, and analyzing the influence of different impeller speeds and gas pressures on the gas extraction rate in the vacuum chamber; S40. Analyze the currently collected status data to determine the current impeller speed in the liquid ring vacuum pump, the gas pressure and temperature in the current vacuum chamber, and calculate the impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment based on the target pressure of the vacuum chamber, the required time to reach the target pressure, the established gas pumping speed analysis model, the current impeller speed in the liquid ring vacuum pump, the current gas pressure and temperature in the vacuum chamber, and control and adjust the liquid ring vacuum pump according to the calculation results until the target pressure of the vacuum chamber is reached.

5. The intelligent control method of a liquid ring vacuum pump according to claim 4, characterized in that: The method for determining the number of moles of gas in the vacuum chamber according to the gas pressure and temperature in the vacuum chamber is as follows: determine the volume V of the vacuum chamber; and determine the gas pressure Y and temperature W in the vacuum chamber; according to V, Y and W, obtain the number of moles n of gas in the vacuum chamber, according to the ideal gas state equation: Here, R represents the ideal gas constant.

6. The intelligent control method of a liquid ring vacuum pump according to claim 5, characterized in that: The method steps of step S30 are: S301, analyzing the historical status data stored in the database to determine the impeller speed in the liquid ring vacuum pump at different historical time stamps t0. Gas pressure in the vacuum chamber and temperature According to V. And the ideal gas state equation, determine the number of moles of gas in the vacuum chamber at different historical timestamps t0 according to Determine the gas extraction rate in the vacuum chamber at different historical timestamps t0 in, represents the number of moles of gas in the vacuum chamber at time t0-1; Δt represents the time step; S302, establish a gas pumping speed analysis model, take the impeller speed S in the liquid ring vacuum pump and the gas pressure Y in the vacuum chamber as independent variables, take the gas extraction rate u in the vacuum chamber as the dependent variable, analyze the influence of different impeller speeds and gas pressures on the gas extraction rate in the vacuum chamber, according to the calculation formula: u=aS(e bY -c) Where a, b and c are all positive numbers, and c>1; e represents a natural constant; S303, and The values ​​of a, b and c are respectively substituted into the calculation formula of step S302, and curve fitting is performed according to the least squares method to find the best curve and determine the values ​​of a, b and c.

7. The intelligent control method of a liquid ring vacuum pump according to claim 6, characterized in that: The method steps of step S40 are: S401, analyzing the currently collected state data to determine the impeller speed S in the liquid ring vacuum pump at the current timestamp t. t , gas pressure Y in the vacuum chamber t and temperature W t ; S402, according to the target pressure Y of the vacuum chamber x , the required time to reach the target pressure, the established gas pumping speed analysis model, S t , Y t and W t , calculate the liquid ring vacuum pump impeller speed S that needs to be adjusted at time t+1 t+1 : Among them, n x represents the number of moles of gas at the target pressure of the vacuum chamber, n t represents the number of moles of gas in the vacuum chamber at time t, T t Indicates the required time to reach the target pressure at time t; S403, adjust the impeller speed of the liquid ring vacuum pump to S at time t+1 t+1 , until the target pressure of the vacuum chamber is reached, completing the liquid ring vacuum pump control task.

Images