CN215006395U - Intelligent liquid level control box - Google Patents
Intelligent liquid level control box Download PDFInfo
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- CN215006395U CN215006395U CN202121708622.1U CN202121708622U CN215006395U CN 215006395 U CN215006395 U CN 215006395U CN 202121708622 U CN202121708622 U CN 202121708622U CN 215006395 U CN215006395 U CN 215006395U
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Abstract
The utility model discloses an intelligent liquid level control box, which relates to the technical field of liquid level control and comprises a solution box, wherein a water inlet of the solution box is connected with a water pump, a water inlet and a water outlet of the solution box are respectively provided with a switch valve, a liquid level sensor is arranged in the solution box, and a touch display screen is arranged outside the solution box; the water pump, the liquid level sensor, the switch valve and the touch display screen are respectively connected with the controller; the liquid level sensor is internally provided with a signal emitter, and the liquid level sensor sends a liquid level signal to the controller through the signal emitter. The utility model provides a liquid level control box control accuracy is high, and easy operation through the device, can help the tester to know automatic control system's constitution, connection, operational mode.
Description
Technical Field
The utility model relates to a liquid level control technical field particularly, relates to an intelligence liquid level control case.
Background
Liquid level is one of the commonly regulated quantities in industrial process automation. The liquid level control is the important content in the professional teaching of automatic control type and measurement and control type, and in order to better reform the teaching and improve the experimental manipulative ability of students, a single-container water tank liquid level control experimental device needs to be designed. By the device, the measuring method and the control method of the liquid level in the process control can be mastered, and the static and dynamic working characteristics of the controlled object can be understood from the control perspective.
SUMMERY OF THE UTILITY MODEL
In order to overcome above-mentioned problem or solve above-mentioned problem at least partially, the embodiment of the utility model provides an intelligence liquid level control case to help the experimenter to know automatic control system's constitution, connection, operational mode.
The embodiment of the utility model is realized like this:
an intelligent liquid level control box comprises a solution box, wherein a water inlet of the solution box is connected with a water pump, a water inlet and a water outlet of the solution box are respectively provided with a switch valve, a liquid level sensor is arranged in the solution box, and a touch display screen is arranged outside the solution box;
the water pump, the liquid level sensor, the switch valve and the touch display screen are respectively connected with the controller;
the liquid level sensor is internally provided with a signal emitter, and the liquid level sensor sends a liquid level signal to the controller through the signal emitter.
In some embodiments of the present invention, the switch valve is an electric valve.
In some embodiments of the present invention, the liquid level sensor is a non-contact liquid level sensor, and the non-contact liquid level sensor is disposed at the top of the solution tank.
In some embodiments of the present invention, the non-contact liquid level sensor is an ultrasonic liquid level sensor of IRU-9400 series.
In some embodiments of the present invention, a fixing frame for fixing the non-contact liquid level sensor is connected to the top of the solution tank.
In some embodiments of the present invention, the signal transmitter includes a first LORA module, and the controller is internally provided with a second LORA module for wirelessly connecting with the first LORA module.
In some embodiments of the present invention, the controller is a PID controller.
In some embodiments of the utility model, still including being used for warning the current solution incasement liquid level too high or low alarm device excessively, above-mentioned alarm device is connected with the output of above-mentioned controller.
In some embodiments of the present invention, the alarm device includes a buzzer, and the buzzer is connected to the output end of the controller.
The utility model discloses an in some embodiments, above-mentioned alarm device includes the warning light, and above-mentioned warning light is connected with the output of above-mentioned controller.
The embodiment of the utility model provides an at least, have following advantage or beneficial effect:
the embodiment of the utility model provides an in, the liquid level control case includes the solution tank, and the water inlet and the water pump of solution tank are connected, are carried liquid to the solution tank in by the water pump. In order to ensure that the liquid level of the solution in the solution tank is controllable, switch valves are required to be respectively arranged at a water inlet and a water outlet of the solution tank and are respectively used for controlling the liquid inlet and the liquid outlet of the solution in the solution tank. In order to accurately control the flow rate of the solution entering or discharging in the solution tank, the switch valve may be an electric valve, and compared with an electromagnetic valve which can only be opened or closed, the electric valve can adjust the opening and closing degree, control the flow rate of the liquid and realize accurate control of the liquid level.
In order to realize automatic and accurate control of the liquid level, in the embodiment, the liquid level sensor, the controller, the switch valve and the water pump form a liquid level closed-loop control system. In an exemplary embodiment, the discharge of the liquid in the solution tank is controlled mainly by opening or closing the switch valve at the water outlet of the solution tank, so that the water level is lowered, and the water level is raised, and besides controlling whether to continue flowing the liquid into the solution tank by controlling the opening or closing of the switch valve at the water inlet of the solution tank, the water pump can be controlled to continue conveying the liquid into the solution tank by controlling the start and stop of the water pump.
Exemplarily, the built-in signal transmitter of level sensor through this signal transmitter, can make and realize wireless communication between level sensor and the controller, so, then need not to connect the cable between level sensor and the controller, can make the experimental scene cleaner and tidier, and the user uses more conveniently. Illustratively, wireless communication between the sensors and the controller may be achieved through LORA technology. The LORA is one of LPWAN communication technologies, and is an ultra-long-distance wireless transmission scheme based on a spread spectrum technology. The scheme changes the prior compromise consideration mode of transmission distance and power consumption, provides a simple system which can realize long distance, long battery life and large capacity for users, and further expands the sensing network. Currently, the LoRa mainly operates in global free frequency bands including 433, 868, 915MHz, and the like. An exemplary controller may include a microcontroller of the STM32WL family and a second LORA module, an embedded sub-GHz transceiver support of the STM32WL family
A radio protocol stack, which may be provided on demand. The built-in first LORA module of level sensor, the wireless connection of the second LORA module in first LORA module and the controller for can realize wireless data transmission between level sensor and the controller.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a block diagram of a system structure according to an embodiment of the intelligent liquid level control box of the present invention;
fig. 2 is a schematic structural diagram of an embodiment of the intelligent liquid level control box of the present invention;
FIG. 3 is a connection diagram of a water pump start/stop control circuit according to an embodiment of the intelligent liquid level control box of the present invention;
fig. 4 is the utility model relates to a PID operation circuit diagram of an intelligence liquid level control case embodiment.
Icon: 1-a solution tank; 2-switching valve; 3-a liquid level sensor; 31-a signal transmitter; 4-touch control display screen; 5-a controller; 6-an alarm device; 7-a fixing frame; 100-water pump.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that, if the terms "vertical", "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that the products of the present invention are usually placed when they are used, the description is only for convenience of description and simplification, but the indication or suggestion that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "vertical" and the like, if present, does not require that the components be perfectly vertical, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless explicitly stated or limited otherwise, the terms "disposed," "mounted," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Example 1
Referring to fig. 1 and 2, the present embodiment provides an intelligent liquid level control box, which includes a solution tank 1, a water inlet of the solution tank 1 is connected to a water pump 100, a water inlet and a water outlet of the solution tank 1 are respectively provided with a switch valve 2, a liquid level sensor 3 is disposed in the solution tank 1, and a touch display screen 4 is disposed outside the solution tank 1; the water pump 100, the liquid level sensor 3, the switch valve 2 and the touch display screen 4 are respectively connected with the controller 5; the level sensor 3 has a built-in signal transmitter 31, and the level sensor 3 transmits a level signal to the controller 5 via the signal transmitter 31.
Illustratively, in this embodiment, the liquid level control box comprises a solution tank 1, a water inlet of the solution tank 1 is connected with a water pump 100, and the water pump 100 delivers liquid into the solution tank 1. In order to ensure that the liquid level of the solution in the solution tank 1 is controllable, switch valves 2 are required to be respectively arranged at a water inlet and a water outlet of the solution tank 1 and are respectively used for controlling the liquid inlet and the liquid outlet of the solution in the solution tank 1. In order to accurately control the flow rate of the solution entering or discharging in the solution tank 1, the switch valve 2 may be an electrically operated valve, and compared with an electromagnetic valve which can only be opened or closed, the electrically operated valve can adjust the opening and closing degree, control the flow rate of the liquid, and realize accurate control of the liquid level.
In order to realize automatic and accurate control of the liquid level, in the present embodiment, the liquid level sensor 3, the controller 5, the switch valve 2 and the water pump 100 form a liquid level closed-loop control system. For example, in this embodiment, the discharge of the liquid in the solution tank 1 is controlled by mainly opening or closing the on-off valve 2 at the water outlet of the solution tank 1, so that the water level is lowered, and the raising of the water level can control whether to continue to flow the liquid into the solution tank 1 by controlling the on-off of the on-off valve 2 at the water inlet of the solution tank 1, and can also control whether to continue to convey the liquid into the solution tank 1 by directly controlling the start and stop of the water pump 100. Exemplarily, as shown in fig. 3, a connection diagram of a start-stop control circuit of the water pump 100 is shown, in which a1 st pin, a2 nd pin, and a3 rd pin of the double-single-pole double-throw switch SW are a normally-closed end pin, a normally-open end pin, and a common end pin of one single-pole double-throw switch thereof, and a4 th pin, a 5 th pin, and a 6 th pin of the double-single-pole double-throw switch SW are a normally-closed end pin, a normally-open end pin, and a common end pin of another single-pole double-throw switch thereof, respectively; a resistor R19 is connected between the non-inverting input end and the output end of the comparator U1D, the output end of the comparator U1D is connected with the 1 st pin of the double-single-pole double-throw switch SW through a resistor R21, the 2 nd pin and the 4 th pin of the double-single-pole double-throw switch SW are both connected with the base electrode of a triode Q2, the 3 rd pin of the double-single-pole double-throw switch SW is connected with the base electrode of a triode Q1, the collector electrode of a triode Q1 and the 6 th pin of the double-single-pole double-throw switch SW are both connected with the output end of a +5V power supply through a resistor R4, the emitter electrode of the triode Q1 and the emitter electrode of a triode Q2 are both grounded, one end of a coil of a relay K and the cathode of a rectifier diode D2 are both connected with the output end of the +5V power supply, the other end of the coil of the relay K and the anode of a rectifier diode D2 are both connected with the collector electrode of the triode Q2, the common contact of the relay K is connected with the positive electrode of the water pump 100, the normally open contact of the relay K is connected with the output end VCC of the power supply of the water pump 100, the normally closed contact of the relay K is suspended, and the negative pole of the power supply of the water pump 100 is grounded.
The fill level sensor 3 is, for example, provided with a signal transmitter 31, by means of which signal transmitter 31 the fill level sensor 3 can be controlledRealize wireless communication between system 5, so, then need not to connect the cable between level sensor 3 and the controller 5, can make the experimental scene cleaner and tidier, user's use is more convenient. Illustratively, wireless communication between the sensors and the controller 5 may be achieved by LORA technology. The LORA is one of LPWAN communication technologies, and is an ultra-long-distance wireless transmission scheme based on a spread spectrum technology. The scheme changes the prior compromise consideration mode of transmission distance and power consumption, provides a simple system which can realize long distance, long battery life and large capacity for users, and further expands the sensing network. Currently, the LoRa mainly operates in global free frequency bands including 433, 868, 915MHz, and the like. An exemplary controller 5 may comprise a microcontroller 5 of the STM32WL family and a second LORA module, an embedded sub-GHz transceiver support of the STM32WL family
A radio protocol stack, which may be provided on demand. Built-in first LORA module of level sensor 3, the wireless connection of the second LORA module in first LORA module and the controller 5 for can realize wireless data transmission between level sensor 3 and the controller 5.
In addition, in order to more intuitively reflect the current liquid level condition in the solution tank 1, for example, in this embodiment, a touch display screen 4 is further included, where the touch display screen 4 is also an operation panel, and a user may change a preset value of the liquid level, start and stop of a control system, and the like through the touch display screen 4.
Example 2
Referring to fig. 2, in some embodiments of the present invention, the liquid level sensor 3 is a non-contact liquid level sensor 3, and the non-contact liquid level sensor 3 is disposed on the top of the solution tank 1.
Illustratively, the liquid level sensor 3 may be a non-contact liquid level sensor 3, the non-contact liquid level sensor 3 is not affected by the color, corrosiveness, pressure, density, etc. of the liquid, and because the sensor does not directly contact the liquid, it is more sanitary, and is convenient for the user to clean, add liquid, etc. the container. The non-contact liquid level sensor 3 mainly comprises an ultrasonic liquid level sensor 3, a capacitance type liquid level sensor 3 and a separated photoelectric liquid level sensor 3. Wherein ultrasonic wave level sensor 3 detects the liquid level condition according to the sound wave reflection principle, and the biggest advantage can listen the liquid level in real time and change, and ultrasonic wave level sensor 3's precision can reach 2mm, and the precision is high, can very accurate detection liquid level condition. The capacitance type liquid level sensor 3 can detect the liquid level condition by being attached to a container, so that the installation process is simple. It has the characteristics of small volume and low price. The separated photoelectric liquid level sensor 3 is designed to realize non-contact detection by designing a reflected light tracing part on the water tank and not directly contacting liquid. The separated photoelectric liquid level sensor 3 is also commonly used in the field of household appliances due to the characteristics of small volume, high precision and high reliability, and is also applied in the fields of medical industry and the like, and the application range is wide. Adopt disconnect-type photoelectricity level sensor 3, can realize the function that the container can remove wantonly equally, and compare in capacitanc level sensor 3, disconnect-type photoelectricity level sensor 3's precision and reliability are higher.
The contactless level sensor 3 used in the present embodiment is, for example, an ultrasonic level sensor 3 of the type IRU-9400. The IRU-9400 series ultrasonic liquid level sensor 3 is developed by utilizing the characteristics of ultrasonic waves; the device has the characteristics of high frequency, short wavelength, small diffraction phenomenon, particularly good directivity, capability of becoming rays to directionally propagate and the like, has large penetrating power to liquid and solid, particularly has good effect on a non-reflective or soft surface measuring object, and can be used indoors.
In order to better fix the ultrasonic liquid level sensor 3, for example, a fixing frame 7 may be connected to the top of the solution tank 1, and the fixing frame 7 is fixedly connected to the inner wall of the solution tank 1. The liquid level sensor 3 is fixed on the fixing frame 7 and faces downwards vertically, and the liquid level of the solution in the current solution tank 1 is reflected by detecting the distance between the liquid level and the liquid level sensor 3.
Example 3
In some embodiments of the present invention, the controller 5 is a PID controller 5.
The controller 5 may be a PID controller 5 in this embodiment. The PID controller 5 (proportional-integral-derivative controller 5) is composed of a proportional unit (P), an integral unit (I), and a derivative unit (D). Through setting Kp, Ki and Kd. The PID controller 5 is primarily suitable for use in systems that are substantially linear and have dynamics that do not change over time. The PID controller 5 is a feedback loop component that is common in industrial control applications. The controller 5 compares the collected data with a reference value and then uses this difference to calculate a new input value which is intended to allow the data of the system to reach or remain at the reference value. Unlike other simple control operations, the PID controller 5 can adjust the input value according to the historical data and the occurrence rate of the difference, which can make the system more accurate and more stable. It can be shown mathematically that a PID feedback loop can maintain the stability of the system in the event that other control methods result in a system with a stability error or process iteration.
For example, if the solution tank 1 is supplying water to a plant, the water in the solution tank 1 needs to be maintained at a certain height. The level sensor 3 is used to check the level of the water in the tank, and a measurement result is obtained. The controller 5 will have a fixed user input value indicating the desired water level in the tank, assuming this value is 65% water hold. The output of the controller 5 is connected to a motor-controlled on-off valve 2. When the valve is opened, water is filled into the water tank, and when the valve is closed, the water amount in the water tank is reduced. The control signal for this valve is the variable we control and is the input to the system to keep the tank water level constant. In addition, the PID controller 5 can be directly used, and the PID closed-loop control can also be realized based on the PLC.
As shown in fig. 4, a PID operation circuit diagram is shown. The resistors RP1, R7, R6 and the integrated amplifier chip A1 form a reverse proportion amplifying circuit, wherein RP1 is an adjustable resistor, so that the reverse proportion amplifying times are adjustable; the resistors RP2, R8 and R9, the capacitor C1 and the integrated amplifier chip A2 form a reverse integral operation circuit, wherein RP2 is an adjustable resistor, so that a reverse integral coefficient is adjustable; the resistors RP3, R10, R11 and R12, the capacitors C2 and C3 and the integrated amplifier chip A3 form an inverse differential operation circuit, the capacitor C3 plays a role of a stable differential circuit, and the RP3 is an adjustable resistor, so that the inverse differential coefficient is adjustable; the resistors R13, R14, R15, R16, R17 and the integrated amplifier chip A4 form an inverse summation circuit; after proportional, integral and differential operations, the water level error signal IN is added with proportional, integral and differential signals by a summing circuit, and finally a voltage control signal OUT is output.
Example 4
Referring to fig. 1, in some embodiments of the present invention, the present invention further includes an alarm device 6 for warning that the liquid level in the solution tank 1 is too high or too low, and the alarm device 6 is connected to the output end of the controller 5.
Illustratively, in order to prevent the situation that the liquid level in the solution tank 1 is too low or too high under special conditions (the switch valve 2, the water pump 100 are out of order, etc.) and a user cannot find the situation in time, in the embodiment, an alarm device 6 is further provided, and when the liquid level in the solution tank 1 is higher or lower than a preset value, the alarm device 6 is started to remind the user to take corresponding emergency measures. The alarm device 6 may be, for example, a warning light or a buzzer.
To sum up, the embodiment of the utility model provides an intelligence liquid level control case has following beneficial effect:
in the embodiment of the present invention, the liquid level control box includes the solution tank 1, the water inlet of the solution tank 1 is connected to the water pump 100, and the water pump 100 conveys liquid into the solution tank 1. In order to ensure that the liquid level of the solution in the solution tank 1 is controllable, switch valves 2 are required to be respectively arranged at a water inlet and a water outlet of the solution tank 1 and are respectively used for controlling the liquid inlet and the liquid outlet of the solution in the solution tank 1. In order to accurately control the flow rate of the solution entering or discharging in the solution tank 1, the switch valve 2 may be an electrically operated valve, and compared with an electromagnetic valve which can only be opened or closed, the electrically operated valve can adjust the opening and closing degree, control the flow rate of the liquid, and realize accurate control of the liquid level.
In order to realize automatic and accurate control of the liquid level, in the present embodiment, the liquid level sensor 3, the controller 5, the switch valve 2 and the water pump 100 form a liquid level closed-loop control system. For example, in this embodiment, the discharge of the liquid in the solution tank 1 is controlled by mainly opening or closing the on-off valve 2 at the water outlet of the solution tank 1, so that the water level is lowered, and the raising of the water level can control whether to continue to flow the liquid into the solution tank 1 by controlling the on-off of the on-off valve 2 at the water inlet of the solution tank 1, and can also control whether to continue to convey the liquid into the solution tank 1 by directly controlling the start and stop of the water pump 100.
Exemplarily, built-in signal transmitter 31 of level sensor 3 through this signal transmitter 31, can make and realize wireless communication between level sensor 3 and the controller 5, so, then need not to connect the cable between level sensor 3 and the controller 5, can make the experimental scene cleaner and tidier, and the user uses more conveniently. Illustratively, wireless communication between the sensors and the controller 5 may be achieved by LORA technology. The LORA is one of LPWAN communication technologies, and is an ultra-long-distance wireless transmission scheme based on a spread spectrum technology. The scheme changes the prior compromise consideration mode of transmission distance and power consumption, provides a simple system which can realize long distance, long battery life and large capacity for users, and further expands the sensing network. Currently, the LoRa mainly operates in global free frequency bands including 433, 868, 915MHz, and the like. An exemplary controller 5 may comprise a microcontroller 5 of the STM32WL family and a second LORA module, an embedded sub-GHz transceiver support of the STM32WL family
A radio protocol stack, which may be provided on demand. Built-in first LORA module of level sensor 3, the wireless connection of the second LORA module in first LORA module and the controller 5 for can realize wireless data transmission between level sensor 3 and the controller 5.
In addition, in order to more intuitively reflect the current liquid level condition in the solution tank 1, for example, in this embodiment, a touch display screen 4 is further included, where the touch display screen 4 is also an operation panel, and a user may change a preset value of the liquid level, start and stop of a control system, and the like through the touch display screen 4.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. An intelligent liquid level control box comprises a solution box, wherein a water inlet of the solution box is connected with a water pump, and the intelligent liquid level control box is characterized in that a water inlet and a water outlet of the solution box are respectively provided with a switch valve, a liquid level sensor is arranged in the solution box, and a touch display screen is arranged outside the solution box;
the water pump, the liquid level sensor, the switch valve and the touch display screen are respectively connected with the controller;
the liquid level sensor is internally provided with a signal emitter, and the liquid level sensor sends a liquid level signal to the controller through the signal emitter.
2. The tank of claim 1 wherein the switch valve is an electrically operated valve.
3. The tank of claim 1 wherein the level sensor is a non-contact level sensor located at the top of the tank.
4. A tank as claimed in claim 3, characterised in that the contactless level sensor is an ultrasonic level sensor of the IRU-9400 series.
5. The tank of claim 3, wherein a fixing bracket for fixing the non-contact level sensor is connected to the top of the tank.
6. The fluid level control tank of claim 1, wherein the signal transmitter comprises a first LORA module, and the controller has a built-in second LORA module for wirelessly connecting to the first LORA module.
7. The fluid level control tank of claim 1, wherein the controller is a PID controller.
8. The tank of claim 1 further comprising an alarm device for warning of a current solution tank level being too high or too low, said alarm device being connected to the output of said controller.
9. The tank of claim 8 wherein the alarm device comprises a buzzer connected to an output of the controller.
10. The tank of claim 8 wherein the alarm device comprises a warning light connected to the output of the controller.
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| CN202121708622.1U CN215006395U (en) | 2021-07-26 | 2021-07-26 | Intelligent liquid level control box |
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