Water ring vacuum pump monitoring control device

Abstract

The utility model discloses a water ring vacuum pump monitoring control device, which relates to the technical field of intelligent monitoring and control and comprises a circulating mechanism comprising a vacuum pump. The system further comprises a controller, a working fluid flow sensor, an air suction pressure sensor, a working fluid flow regulating valve and an air suction pressure regulating valve, the controller adopts a Smith pre-estimation control algorithm, and the controller at least comprises an input unit and an output unit. The input unit is used for receiving a flow signal provided by the working fluid flow sensor, a pressure signal provided by the suction pressure sensor and a rotating speed signal provided by the driving motor, the output unit adjusts the opening degree of the working fluid flow adjusting valve, the opening degree of the suction pressure adjusting valve and the rotating speed of the driving motor according to processing results, and adjustment is rapid and accurate. Stable vacuum degree and normal operation of the vacuum pump are maintained, time lag time and interference magnitude of vacuum system control can be reduced, and stability of system equipment and production is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent monitoring and control, and particularly relates to a monitoring and control device for a water ring vacuum pump. Background Art

[0002] At present, the system control of a vacuum pump adopts a mode jointly driven by a motor and a hydraulic braking system. After receiving an oil supply command, the mechanical response of the hydraulic braking system requires time, the hydraulic oil entering the hydraulic cylinder requires time, the increase of torque requires time, and the torque action also requires time, resulting in a too high lag time of the hydraulic system behind the system response state, thus causing the vacuum degree of the vacuum pump to have a large pure lag characteristic. Therefore, there are still drawbacks and deficiencies in the technology, and an intelligent monitoring and control system is needed to solve the problem that the vacuum degree of the current vacuum pump has a large pure lag. Content of the Utility Model

[0003] The purpose of the utility model is to provide a monitoring and control device for a water ring vacuum pump, which solves the technical problem that the system control of the current vacuum pump adopts a mode jointly driven by a motor and a hydraulic braking system, resulting in a large pure lag characteristic of the vacuum degree of the vacuum pump.

[0004] To achieve the above purpose, the utility model provides a monitoring and control device for a water ring vacuum pump, including:

[0005] A circulation mechanism, including a vacuum pump, on which a driving motor is installed, and the driving motor is used to drive the vacuum pump to work;

[0006] It further includes a controller, a working fluid flow sensor, an intake pressure sensor, a working fluid flow regulating valve and an intake pressure regulating valve, and the controller at least includes an input unit and an output unit;

[0007] Wherein, the input unit is used to receive the flow signal provided by the working fluid flow sensor, the pressure signal provided by the intake pressure sensor and the rotation speed signal provided by the driving motor, and the output unit is electrically connected to the working fluid flow regulating valve, the intake pressure regulating valve and the driving motor.

[0008] Preferably, the circulation mechanism further includes:

[0009] A water storage tank;

[0010] An intake pipe, which is communicated with the internal cavity of the vacuum pump and is used for air to enter the cavity of the vacuum pump;

[0011] A working fluid supply pipe, with two ends respectively connected to the water storage tank and the vacuum pump, and is used to transport the water in the water storage tank to the internal cavity of the vacuum pump;

[0012] The vacuum pump discharge pipe is connected to the water storage tank and the vacuum pump at both ends respectively, and is used to transport the gas-liquid mixture of water and air in the vacuum pump cavity to the water storage tank.

[0013] Preferably, it further includes a cooling mechanism for cooling the working fluid in the working fluid supply pipe. The cooling mechanism includes a chiller and a heat exchanger. The chiller is connected to the heat exchange pipeline of the heat exchanger, and the working fluid supply pipe is connected to the water inlet and outlet of the heat exchanger.

[0014] Preferably, the working fluid flow sensor is installed on the working fluid supply pipe for measuring the flow rate of the working fluid in the working fluid supply pipe.

[0015] Preferably, the suction pressure sensor is connected to the intake pipe for measuring the pressure of the air entering the vacuum pump through the intake pipe.

[0016] Preferably, the working fluid flow regulating valve is installed on the working fluid supply pipe for regulating the flow rate of the working fluid in the working fluid supply pipe.

[0017] Preferably, the suction pressure regulating valve is installed on the intake pipe for regulating the pressure of the air in the intake pipe.

[0018] Preferably, an automatic water supply pipe and a manual water supply pipe are connected to the water storage tank. An automatic water supply valve is installed on the automatic water supply pipe, and a manual water supply valve is installed on the manual water supply pipe.

[0019] Preferably, an automatic drain pipe and a manual drain pipe are connected to the water storage tank. The automatic drain pipe is arranged on the side of the water storage tank, and the manual drain pipe is arranged at the bottom of the water storage tank. The automatic drain pipe is connected to the manual drain pipe. An automatic drain valve is installed on the automatic drain pipe, and a manual drain valve is installed on the manual drain pipe.

[0020] Preferably, a drain pipe is further connected to the vacuum pump. The drain pipe is connected to the manual drain pipe, and a drain valve is installed on the drain pipe

[0021] Compared with the above background technology, for the water ring vacuum pump monitoring and control device provided by the present invention, the controller adopts the Smith prediction control algorithm. The input unit of the controller is used to receive the flow signal provided by the working fluid flow sensor, the pressure signal provided by the suction pressure sensor, and the speed signal provided by the drive motor. The output unit adjusts the opening degree of the working fluid flow regulating valve, the opening degree of the suction pressure regulating valve, and the speed of the drive motor according to the processing result. The adjustment is fast and accurate, maintaining the stability of the vacuum degree and the normal operation of the vacuum pump, reducing the time lag and overshoot of the vacuum system control, improving the stability of the system equipment and production, and thus saving energy, reducing costs and increasing efficiency. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0023] Figure 1 It is a schematic structural diagram of the water ring vacuum pump monitoring and control device provided by the embodiment of the present invention.

[0024] Figure 1 Reference numerals in the figure: 10, circulation mechanism; 11, water storage tank; 111, automatic water supply pipe; 1111, automatic water supply valve; 112, manual water supply pipe; 1121, manual water supply valve; 113, automatic drain pipe; 1131, automatic drain valve; 114, manual drain pipe; 1141, manual drain valve; 115, exhaust pipe; 1151, exhaust valve; 12, vacuum pump; 121, drive motor; 122, drain pipe; 1221, drain valve; 13, intake pipe; 14, working fluid supply pipe; 15, vacuum pump discharge pipe; 21, controller; 22, working fluid flow sensor; 23, suction pressure sensor; 24, working fluid flow regulating valve; 25, suction pressure regulating valve; 26, frequency converter; 30, cooling mechanism; 31, chiller; 32, heat exchanger. Detailed Embodiments

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the 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 the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0026] In order to enable those skilled in the art of this technology to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0027] It should be noted that Figure 1 the arrows in the figure indicate the flow direction of water or air.

[0028] The utility model provides a monitoring and control device for a water ring vacuum pump, which realizes the intelligent monitoring and control of the water ring vacuum pump. According to the required vacuum degree in actual operation, it dynamically monitors and intelligently and quickly adjusts the operating parameters of the vacuum pump, reduces the time lag and overrun in the control of the vacuum system, improves the stability of system equipment and production, and achieves the purpose of optimizing the process and taking energy conservation into account.

[0029] Please refer to Figure 1 , the monitoring and control device for the water ring vacuum pump provided by the utility model includes a circulation mechanism 10.

[0030] Among them, the circulation mechanism 10 includes a water storage tank 11, a vacuum pump 12, an air inlet pipe 13, a working fluid supply pipe 14, and a vacuum pump discharge pipe 15. Among them, the vacuum pump 12 is a water ring vacuum pump.

[0031] The air inlet pipe 13 is communicated with the internal cavity of the vacuum pump 12 and is used for air to enter the cavity of the vacuum pump 12;

[0032] Both ends of the working fluid supply pipe 14 are respectively connected to the water storage tank 11 and the vacuum pump 12, and the water in the water storage tank 11 is transported into the internal cavity of the vacuum pump 12 through the working fluid supply pipe 14;

[0033] Both ends of the vacuum pump discharge pipe 15 are respectively connected to the water storage tank 11 and the vacuum pump 12, and the gas-liquid mixture of water and air entering the cavity of the vacuum pump 12 is transported into the water storage tank 11 through the vacuum pump discharge pipe 15.

[0034] It can be understood that in this embodiment, the working fluid is water.

[0035] Please refer to Figure 1 , an automatic water supply pipe 111 and a manual water supply pipe 112 are connected to the water storage tank 11. Both the automatic water supply pipe 111 and the manual water supply pipe 112 are connected to one end of the water inlet pipe, and the other end of the water inlet pipe is used to connect to a water source during water replenishment. Among them, the automatic water supply pipe 111 and the manual water supply pipe 112 are arranged on the side of the water storage tank 11. An automatic water supply valve 1111 is installed on the automatic water supply pipe 111 for automatically replenishing water into the water storage tank 11; a manual water supply valve 1121 is installed on the manual water supply pipe 112 for manually replenishing water into the water storage tank 11.

[0036] Please refer to Figure 1 , an automatic drain pipe 113 and a manual drain pipe 114 are connected to the water storage tank 11. Among them, the automatic drain pipe 113 is arranged on the side of the water storage tank 11, the manual drain pipe 114 is arranged at the bottom of the water storage tank 11, and the automatic drain pipe 113 is connected to the manual drain pipe 114. An automatic drain valve 1131 is installed on the automatic drain pipe 113, and a manual drain valve 1141 is installed on the manual drain pipe 114.

[0037] Please refer toFigure 1 , an exhaust pipe 115 is also connected to the water storage tank 11. The exhaust pipe 115 is located at the top of the water storage tank 11, and an exhaust valve 1151 is installed on the exhaust pipe 115. The main function of the exhaust valve 1151 is to discharge gas and regulate pressure to avoid excessive pressure in the water storage tank 11, thereby protecting the equipment.

[0038] A driving motor 121 is installed on the vacuum pump 12 to drive the vacuum pump 12 to work.

[0039] Please refer to Figure 1 , a water discharge pipe 122 is also connected to the vacuum pump 12 for discharging the water in the vacuum pump 12 after the work is completed. The water discharge pipe 122 is connected to the manual drain pipe 114 on the water storage tank 11. In addition, a water discharge valve 1221 is installed on the water discharge pipe 122.

[0040] The functions of the automatic water replenishing valve 1111, manual water replenishing valve 1121, automatic drain valve 1131, manual drain valve 1141 on the water storage tank 11 and the water discharge valve 1221 on the pump body are to keep the water circulation mechanism 10 at a certain pressure and avoid excessive pressure.

[0041] Please refer to Figure 1 , the water ring vacuum pump monitoring and control device further includes a controller 21, a working fluid flow sensor 22, a suction pressure sensor 23, a working fluid flow regulating valve 24 and a suction pressure regulating valve 25.

[0042] Among them, the controller 21 adopts a Smith predictor control algorithm. The controller 21 at least includes an input unit, an output unit and a central processing unit. The input unit is used to receive external signals and convert these signals into a format that the controller 21 can understand and process for corresponding operations or controls. The external signals are transmitted to the controller 21 through an input circuit. After being processed by the central processing unit, the output unit of the controller 21 will control the operating state of external devices or systems according to the processing results.

[0043] Please refer to Figure 1 , in this embodiment, the controller 21 is electrically connected to the driving motor 121, the working fluid flow sensor 22, the suction pressure sensor 23, the working fluid flow regulating valve 24 and the suction pressure regulating valve 25.

[0044] Among them, the working fluid flow sensor 22 is installed on the working fluid supply pipe 14 to measure the flow of the working fluid in the working fluid supply pipe 14. The working fluid flow sensor 22 is electrically connected to the input unit of the controller 21. During operation, the input unit of the controller 21 receives the flow signal provided by the working fluid flow sensor 22;

[0045] The intake pressure sensor 23 is connected to the intake pipe 13 and is used to measure the pressure of the air entering the vacuum pump 12 through the intake pipe 13. The intake pressure sensor 23 is electrically connected to the input unit of the controller 21. During operation, the input unit of the controller 21 receives the pressure signal provided by the intake pressure sensor 23;

[0046] The working fluid flow regulating valve 24 is installed on the working fluid supply pipe 14 and is used to regulate the flow rate of the working fluid in the working fluid supply pipe 14. The working fluid flow regulating valve 24 is electrically connected to the output unit of the controller 21. During operation, the input unit of the controller 21 receives the flow rate signal provided by the working fluid flow sensor 22. After the flow rate signal is processed by the central processing unit, the output unit of the controller 21 controls the working state of the working fluid flow regulating valve 24 according to the processing result, that is, the opening degree of the working fluid flow regulating valve 24, so as to regulate the flow rate of the working fluid in the working fluid supply pipe 14;

[0047] The intake pressure regulating valve 25 is installed on the intake pipe 13 and is used to regulate the pressure of the air in the intake pipe 13. The intake pressure regulating valve 25 is electrically connected to the output unit of the controller 21. During operation, the input unit of the controller 21 receives the pressure signal provided by the intake pressure sensor 23. After the pressure signal is processed by the central processing unit, the output unit of the controller 21 controls the working state of the intake pressure regulating valve 25 according to the processing result, that is, the opening degree of the intake pressure regulating valve 25, so as to regulate the pressure of the air entering the vacuum pump 12 through the intake pipe 13;

[0048] The drive motor 121 is installed on the vacuum pump 12 and is used to drive the vacuum pump 12 to work. The drive motor 121 is electrically connected to both the input unit and the output unit of the controller 21. During operation, the input unit of the controller 21 receives the rotation speed signal provided by the drive motor 121. After the rotation speed signal is processed by the central processing unit, the output unit of the controller 21 controls the working state of the drive motor 121 according to the processing result, so as to regulate the rotation speed of the drive motor 121.

[0049] In some embodiments, please refer to Figure 1 , the water ring vacuum pump monitoring and control device provided by the present utility model further includes a cooling mechanism 30, which is used to cool down the working fluid in the working fluid supply pipe 14 to prevent the temperature of the working fluid from being too high.

[0050] Specifically, the cooling mechanism 30 includes a chiller 31 and a heat exchanger 32. The chiller 31 is connected to the heat exchange pipeline of the heat exchanger 32. The working fluid supply pipe 14 is connected to the water inlet and outlet of the heat exchanger 32. During operation, the cold water of the chiller 31 enters the heat exchange pipeline. The working fluid in the working fluid supply pipe 14 enters the heat exchanger 32 through the water inlet. The working fluid exchanges heat with the cold water and cools down. The cooled working fluid enters the working fluid supply pipe 14 through the water outlet and then enters the vacuum pump 12.

[0051] In some of these embodiments, a frequency converter 26 is provided between the output unit of the controller 21 and the drive motor 121. The drive motor 121 is electrically connected to the frequency converter 26, and the frequency converter 26 is electrically connected to the output unit of the controller 21. The drive motor 121 is an AC motor, and the frequency converter 26 controls the drive motor 121 by changing the frequency of the operating power supply of the drive motor 121.

[0052] When the circulation mechanism 10 operates to perform water circulation, the receiving unit of the controller 21 receives the flow signal provided by the working fluid flow sensor 22, the pressure signal provided by the suction pressure sensor 23, and the rotational speed signal provided by the drive motor 121. After being processed by the central processing unit, the output unit of the controller 21 adjusts the opening degree of the working fluid flow regulating valve 24, the opening degree of the suction pressure regulating valve 25, and the rotational speed of the drive motor 121 according to the processing result. The controller 21 adopts a Smith predictor control algorithm, which can quickly and accurately control the flow rate of the working fluid, the suction pressure, and the rotational speed of the vacuum pump 12, thereby maintaining the stability of the vacuum degree and the normal operation of the vacuum pump 12, reducing the time lag and overshoot of the vacuum system control, improving the stability of the system equipment and production, and thus saving energy, reducing costs, and increasing efficiency.

[0053] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0054] Specific examples are used in this article to elaborate on the principles and implementation manners of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can be made to the present utility model, and these improvements and modifications also fall within the protection scope of the present utility model.

Claims

1. A water ring vacuum pump monitoring and control device, characterized in that: include: The circulation mechanism comprises a vacuum pump, on which a driving motor is installed, and the driving motor is used to drive the vacuum pump to work; It also includes a controller, a working fluid flow sensor, an air suction pressure sensor, a working fluid flow regulating valve and an air suction pressure regulating valve, wherein the controller includes at least an input unit and an output unit; Among them, the input unit is used to receive the flow signal provided by the working fluid flow sensor, the pressure signal provided by the intake pressure sensor and the speed signal provided by the drive motor, and the output unit is electrically connected to the working fluid flow regulating valve, the intake pressure regulating valve and the drive motor.

2. The water ring vacuum pump monitoring and control device according to claim 1 is characterized in that: The circulation mechanism also includes: Water storage tanks; An air inlet pipe, connected to the internal cavity of the vacuum pump, for allowing air to enter the cavity of the vacuum pump; A working fluid supply pipe, two ends of which are respectively connected to the water storage tank and the vacuum pump, and is used to transport the water in the water storage tank to the internal cavity of the vacuum pump; The vacuum pump discharge pipe has two ends respectively connected to the water storage tank and the vacuum pump, and is used to transport the gas-liquid mixture of water and air in the vacuum pump cavity to the water storage tank.

3. The water ring vacuum pump monitoring and control device according to claim 2 is characterized in that: It also includes a cooling mechanism for cooling the working fluid in the working fluid supply pipe. The cooling mechanism includes a water chiller and a heat exchanger. The water chiller is connected to the heat exchange pipeline of the heat exchanger, and the working fluid supply pipe is connected to the water inlet and outlet of the heat exchanger.

4. The water ring vacuum pump monitoring and control device according to claim 2 is characterized in that: The working fluid flow sensor is installed on the working fluid supply pipe and is used to measure the flow rate of the working fluid in the working fluid supply pipe.

5. The water ring vacuum pump monitoring and control device according to claim 2, characterized in that: The suction pressure sensor is connected to the intake pipe and is used to measure the pressure of the air entering the vacuum pump through the intake pipe.

6. The water ring vacuum pump monitoring and control device according to claim 2, characterized in that: The working fluid flow regulating valve is installed on the working fluid supply pipe and is used to regulate the flow of the working fluid in the working fluid supply pipe.

7. The water ring vacuum pump monitoring and control device according to claim 2, characterized in that: The intake pressure regulating valve is installed on the intake pipe and is used to regulate the pressure of the air in the intake pipe.

8. The water ring vacuum pump monitoring and control device according to claim 2, characterized in that: The water storage tank is connected with an automatic water supply pipe and a manual water supply pipe, the automatic water supply pipe is installed with an automatic water supply valve, and the manual water supply pipe is installed with a manual water supply valve.

9. The water ring vacuum pump monitoring and control device according to claim 2, characterized in that: The water tank is connected with an automatic drain pipe and a manual drain pipe, the automatic drain pipe is arranged on the side of the water tank, the manual drain pipe is arranged at the bottom of the water tank, the automatic drain pipe is connected with the manual drain pipe, the automatic drain pipe is installed with an automatic drain valve, and the manual drain pipe is installed with a manual drain valve.

10. The water ring vacuum pump monitoring and control device according to claim 9, characterized in that: The vacuum pump is also connected with a drain pipe, the drain pipe is connected with the manual drain pipe, and a drain valve is installed on the drain pipe.

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