Intelligent control system and method for liquid ring vacuum pump

Abstract

The invention discloses an intelligent control system and method for a liquid ring vacuum pump, and belongs to the technical field of intelligent control of vacuum pumps. The system comprises an equipment control module, an acquisition monitoring module, a database, a target confirmation module, an intelligent analysis calculation module, a compensation control module and an interaction module. The equipment control module is used for controlling the liquid ring vacuum pump to start or stop; the acquisition monitoring module is used for acquiring state data; the database is used for storing historical data; the target confirmation module is used for determining the target pressure of the vacuum chamber and the required duration for reaching the target pressure; the intelligent analysis and calculation module is used for establishing a gas pumping speed analysis model and analyzing the influence of different impeller rotating speeds and gas pressure intensities on the gas pumping speed in the vacuum chamber; the compensation control module is used for calculating the rotating speed of an impeller of the liquid ring vacuum pump needing to be adjusted at the next moment and controlling and adjusting the liquid ring vacuum pump. And the interaction module is used for providing a man-machine interaction platform and carrying out digital display.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent control of vacuum pumps, and in particular to an intelligent control system and method for a liquid ring vacuum pump. Background Art

[0002] A liquid ring vacuum pump is a vacuum pump that uses liquid as a seal 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. At the same time, the working chamber formed between the liquid ring and the pump body changes continuously during the rotation of the impeller, thereby realizing the suction, compression and discharge of the gas. In the chemical industry, liquid ring vacuum pumps are often used in vacuum distillation, vacuum drying and other process processes. Through intelligent control, precise control of these process processes can be achieved.

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

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

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: an intelligent control system for a liquid ring vacuum pump, the system comprising 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 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 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.

[0006] A liquid ring vacuum pump intelligent control method, the method comprising 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.

[0007] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: by establishing a gas pumping speed analysis model, the influence of different impeller speeds and gas pressures on the gas extraction rate in the vacuum chamber is analyzed, and according to the analysis results, the impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment is calculated, and the liquid ring vacuum pump is controlled and adjusted, thereby improving the adaptability of the intelligent control system; at the same time, the gas pressure in the vacuum chamber reaches the target effect within the specified time, thereby improving the operating efficiency and control ability of the intelligent control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a structural schematic diagram of an intelligent control system for a liquid ring vacuum pump of the present invention; Figure 2 It is a schematic diagram of the steps of an intelligent control method for a liquid ring vacuum pump of the present invention. DETAILED DESCRIPTION

[0009] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0010] See also Figure 1-2 , the present invention provides a technical solution: See also Figure 1 In the first embodiment, a liquid ring vacuum pump intelligent control system is provided. The liquid ring vacuum pump is an embedded liquid ring vacuum pump used for vacuum filtration in the chemical industry. The vacuum environment provided by the liquid ring vacuum pump is used to separate solid particles in the suspension by vacuum suction. Since the vacuum filtration process requires rapid and effective separation of solid particles and liquid, time efficiency needs to be strictly controlled. 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 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.

[0011] 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 interactive module; the collected gas pressure and temperature in the vacuum chamber are sent to the target confirmation module.

[0012] It should be noted that the air inlet of the liquid ring vacuum pump is connected to the vacuum chamber, which is used to extract the gas in the vacuum chamber and change the gas pressure, thereby creating a vacuum environment; the vacuum chamber represents the vacuum environment in which the liquid ring vacuum pump acts.

[0013] 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.

[0014] 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; and 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.

[0015] In this embodiment, the target pressure of the vacuum chamber and the required time to reach the target pressure are determined according to the chemical reaction time, generation amount and generation efficiency of the material. The faster the chemical reaction time of the material, the shorter the required time to reach the target pressure. The more the material is generated, 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 is strictly controlled, the production cycle is shortened, and the overall production efficiency is improved. Since the liquid ring vacuum pump draws out the gas in the vacuum chamber, the molar number of the gas changes, and the volume of the vacuum chamber remains unchanged, the molar number of the gas in the vacuum chamber can be obtained according to the ideal gas state equation and the gas pressure in the vacuum chamber.

[0016] Further, 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.

[0017] 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.

[0018] Furthermore, 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 the gas extraction rate in the vacuum chamber as the dependent variable, to analyze the influence of different impeller speeds and gas pressures on the gas extraction rate in the vacuum chamber.

[0019] The compensation control module is used to analyze the currently collected state 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 liquid ring vacuum pump impeller speed 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; and send the calculated impeller speed of the liquid ring vacuum pump that needs to be adjusted at the next moment to the interaction module.

[0020] Furthermore, 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.

[0021] 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.

[0022] Further, the interaction 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.

[0023] In this embodiment: The embedded liquid ring vacuum pump provides a vacuum environment for the process production of 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 start signal of the liquid ring vacuum pump to the acquisition and monitoring module; The acquisition monitoring module acquires the status data of the liquid ring vacuum pump during operation, and 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; The database stores the collected status data as historical data and continuously updates the collected status data; the collected status data is sent to the intelligent analysis and calculation module; The parameter confirmation unit in the target confirmation module determines the volume of the vacuum chamber, and obtains the number of moles of gas in the vacuum chamber according to the ideal gas state equation; the efficiency confirmation unit determines the target pressure of the vacuum chamber and the required time to reach the target pressure; 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 are sent to the compensation control module; 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 extraction rate analysis model to analyze the influence of different impeller speeds and gas pressures on the gas extraction rate in the vacuum chamber; The data acquisition analysis unit in the compensation control module sends the determined impeller speed of 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 sends the calculated liquid ring vacuum pump impeller speed 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 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 calculated liquid ring vacuum pump impeller speed 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; The interactive module provides a human-computer interaction platform, and digitally displays the liquid ring vacuum pump impeller speed that needs to be adjusted at the next moment and the collected status data through the digital display unit; wherein, when the user manually and 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 manual direct confirmation information is sent to the target confirmation module, and the user's manual direct confirmation information is used as the target pressure of the vacuum chamber and the required time to reach the target pressure; The equipment control module controls the liquid ring vacuum pump to shut down, sends the liquid ring vacuum pump shutdown signal to the acquisition monitoring module, and stops status data acquisition.

[0024] See also Figure 2 In this second embodiment, a liquid ring vacuum pump intelligent control method is provided, the method comprising 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 as historical data in a database, 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.

[0025] 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.

[0026] Specifically, according to the gas pressure and temperature in the vacuum chamber, the method for determining the molar number of the gas 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 , get the number of moles of gas in the vacuum chamber , according to the ideal gas state equation: ;in, represents the ideal gas constant.

[0027] In this implementation, the ideal gas constant is a fixed value, .

[0028] 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 molar number of gas in the vacuum chamber, establish a gas extraction rate analysis model, and analyze the influence of different impeller speeds and gas pressures on the gas extraction rate in the vacuum chamber.

[0029] 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 extraction efficiency of 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 effects 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, thereby improving the accuracy and adaptability of the intelligent control system.

[0030] Specifically, the method steps are: S301: Analyze the historical status data stored in the database to determine different historical timestamps The impeller speed in the liquid ring vacuum pump is , gas pressure in the vacuum chamber and temperature ;according to and ideal gas state equation to determine different historical timestamps The number of moles of gas in the vacuum chamber ;according to , determine different historical timestamps The gas extraction rate in the vacuum chamber is : ;in, Indicated in The number of moles of gas in the vacuum chamber at the moment; represents the time step; S302, establish a gas pumping speed analysis model, and convert the impeller speed in the liquid ring vacuum pump , gas pressure in the vacuum chamber As an independent variable, the gas extraction rate in the vacuum chamber As dependent variables, the influence of different impeller speeds and gas pressures on the gas extraction rate in the vacuum chamber is analyzed according to the calculation formula: ; in, and are all positive numbers, and ; S303, and The values ​​of are 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 and The value of .

[0031] It should be noted that according to the least squares method, the curve fitting is As The training parameters of As The training parameters of As training parameters; Substitute into the curve function calculation formula of step S302, fit in different and The curve under the value makes different and The corresponding value The sum of the squares of the distances between the value points is the smallest, and this curve is taken as the best curve. and The value of .

[0032] 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.

[0033] In this implementation, the liquid ring vacuum pump impeller speed that needs to be adjusted at the next moment is continuously calculated, and the impeller speed is controlled so that the gas pressure in the vacuum chamber reaches the target effect within the specified time, thereby improving the operating efficiency and control ability of the intelligent control system.

[0034] Specifically, the method steps are: S401: Analyze the currently collected status data to determine the current timestamp The impeller speed in the liquid ring vacuum pump is , gas pressure in the vacuum chamber and temperature ; S402, according to the target pressure of the vacuum chamber , the required time to reach the target pressure, the established gas pumping speed analysis model, and ,calculate The liquid ring vacuum pump impeller speed that needs to be adjusted at any time : ; in, represents the number of moles of gas at the target pressure of the vacuum chamber, ; express The number of moles of gas in the vacuum chamber at the moment, ; express The required time to reach the target pressure; S403, The impeller speed of the liquid ring vacuum pump is adjusted to , until the target pressure of the vacuum chamber is reached, completing the liquid ring vacuum pump control task.

[0035] It should be noted that as time goes by, the required time to reach the target pressure It is also decreasing; since the gas temperature in the vacuum chamber will not change significantly during the process of the liquid ring vacuum pump extracting the gas in the vacuum chamber, the influence of temperature change is not considered during the control of the impeller speed of the liquid ring vacuum pump.

[0036] In this embodiment, the liquid ring vacuum pump control task represents controlling the liquid ring vacuum pump to evacuate 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 liquid ring vacuum pump control task; the vacuum chamber includes an air inlet device, and when chemical production is carried out, the air inlet device is closed to prevent external gas from entering, and steps S10-S40 are repeated; when the chemical production is completed, the liquid ring vacuum pump is closed, the air inlet device is opened, and external gas enters.

[0037] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in 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 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 of a liquid ring vacuum pump according to claim 2, characterized in that: 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 the gas extraction rate in the vacuum chamber as the dependent variable, to analyze the influence of different impeller speeds and gas pressures on the gas extraction rate in the vacuum chamber.

4. The intelligent control system for a liquid ring vacuum pump according to claim 3 is characterized in that: 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.

5. 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.

6. A liquid ring vacuum pump intelligent control method, 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.

7. The intelligent control method of a liquid ring vacuum pump according to claim 6, characterized in that: According to the gas pressure and temperature in the vacuum chamber, the method for determining the number of moles of gas in the vacuum chamber is: Determine the volume of the vacuum chamber ; and determine the gas pressure in the vacuum chamber and temperature ;according to and , get the number of moles of gas in the vacuum chamber , according to the ideal gas state equation: ;in, represents the ideal gas constant.

8. The intelligent control method of a liquid ring vacuum pump according to claim 7, characterized in that: The method steps of step S30 are: S301: Analyze the historical status data stored in the database to determine different historical timestamps The impeller speed in the liquid ring vacuum pump is , gas pressure in the vacuum chamber and temperature ;according to and ideal gas state equation to determine different historical timestamps The number of moles of gas in the vacuum chamber ;according to , determine different historical timestamps The gas extraction rate in the vacuum chamber is : ;in, Indicated in The number of moles of gas in the vacuum chamber at the moment; represents the time step; S302, establish a gas pumping speed analysis model, and convert the impeller speed in the liquid ring vacuum pump , gas pressure in the vacuum chamber As an independent variable, the gas extraction rate in the vacuum chamber As dependent variables, the influence of different impeller speeds and gas pressures on the gas extraction rate in the vacuum chamber is analyzed according to the calculation formula: ； in, and are all positive numbers, and ; S303, and The values ​​of are 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 and The value of .

9. The intelligent control method of a liquid ring vacuum pump according to claim 8, characterized in that: The method steps of step S40 are: S401: Analyze the currently collected status data to determine the current timestamp The impeller speed in the liquid ring vacuum pump is , gas pressure in the vacuum chamber and temperature ; S402, according to the target pressure of the vacuum chamber , the required time to reach the target pressure, the established gas pumping speed analysis model, and ,calculate The liquid ring vacuum pump impeller speed that needs to be adjusted at any time : ； in, represents the number of moles of gas at the target pressure of the vacuum chamber, ; express The number of moles of gas in the vacuum chamber at the moment, ; express The required time to reach the target pressure; S403, The impeller speed of the liquid ring vacuum pump is adjusted to , until the target pressure of the vacuum chamber is reached, completing the liquid ring vacuum pump control task.

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