4407 results about "Liquid level sensor" patented technology

The invention discloses a control system applied to an oil-water residue separator, relates to the technical field of equipment control, and constructs a closed-loop control architecture comprising a liquid level sensor, a physical property sensor, a data processing module, a control decision module and an execution module. According to the system, liquid level change trend and conductivity mutation characteristics are extracted, an emulsification interference prediction model is constructed, a discharge threshold value is dynamically corrected, discharge conditions are intelligently judged in combination with separation time logic, discharge operation of oil, water and slag is accurately controlled, the system effectively avoids mistaken arrangement in an emulsification state, the separation efficiency and the automation level are improved, and the system is suitable for large-scale popularization and application. And the operation stability and the environmental protection compliance of the equipment under a high-complexity working condition are obviously enhanced.

The invention relates to the technical field of liquid level detection, in particular to a scrubber sewage tank water level detection system and method based on a liquid level sensor, and the system comprises a sensing data acquisition module, a liquid level signal conversion module, a multi-source numerical value comparison module, a liquid level fluctuation recognition module and an alarm action linkage module. According to the invention, through acquisition of a sensor capacitance change sequence, elimination of abnormal fluctuation, construction of a stable reference curve, enhancement of data immunity, mapping of a liquid level section based on an average capacitance value, accurate identification of liquid level elevation is realized, synchronous comparison of liquid level state information in various communication protocols is realized, and data consistency and reliability are improved. A liquid level fluctuation boundary is accumulatively recognized through trend direction change, a change section is dynamically marked, alarm triggering is based on boundary area and state mark double verification, warning response accuracy and effectiveness are enhanced, and a high-precision and high-stability liquid level detection and early warning system is constructed.

A molten salt reactor system includes a fluid level control system configured to circulate a molten salt through a molten salt loop including an experimental tank, a sump tank, and a drain tank. The fluid level control system further includes a plurality of level sensors, pressure transducers, and electronic pressure regulators fluidically coupled with the fuel salt system. The fluid level control system is configured to receive cover gas pressures in the headspaces of the tanks and calculate target fluid height setpoints for each of the tanks. The fluid level control system further invokes the electronic pressure regulator to iteratively adjust the cover gas pressures of the tanks to achieve and maintain a target fluid level in the experimental tank.

The invention discloses an automatic machine tool cooling liquid supplementing device based on a liquid level sensor, which is applied to the technical field of automatic machine tool cooling liquid supplementing and comprises a liquid supplementing mechanism and a liquid level detection mechanism, the liquid level detection mechanism is arranged on one side of the liquid supplementing mechanism, and the liquid level detection mechanism is in pipeline connection with the liquid supplementing mechanism; the liquid supplementing mechanism comprises a machine body, a control cabinet and a four-way pipe, and the control cabinet is in signal connection with a liquid supplementing system; the liquid level detection mechanism comprises a circulating box, a fifth liquid supplementing pump, a liquid level sensor, a buffering assembly and a cleaning assembly, the buffering assembly and the cleaning assembly are both located in the fine filtrate area, and a concentration sensor is fixedly connected to the interior of the circulating box; the buffer assembly comprises two sets of limiting blocks and a plurality of fan wheels, the cleaning assembly comprises an air cylinder, a cleaning rod and a motor, the bottom of the cleaning rod is arranged to be in a semicircular shape matched with the radius of a floating ball of the liquid level sensor, and automatic and accurate control over cooling liquid can be achieved.

The invention discloses an alpine region-based double-curvature arch dam aeration ice-melting anti-icing device, and relates to the technical field of anti-icing, the alpine region-based double-curvature arch dam aeration ice-melting anti-icing device comprises a double-curvature arch dam body, a lifting structure, an aeration anti-icing structure, a PLC controller, a temperature sensor and a liquid level sensor are arranged on the outer convex curved surface side of the double-curvature arch dam body, and the aeration anti-icing structure comprises a plurality of fourth connecting pipes; the bottoms of the outer sides of the fourth connecting pipes are fixedly connected with a plurality of pressure release valves, and the bottoms of the pressure release valves are fixedly connected with bubble generators, so that along with the rise of the internal air pressure of the fourth connecting pipes, the air flow bursts through the pressure release valves and then is discharged through the bubble generators, and a large number of bubbles are generated; and in the process that the bubbles move towards the water surface, the water surface is stirred, the water surface is prevented from being frozen, the anti-freezing effect on the upstream side of the hyperbolic arch dam body is comprehensively achieved, and damage to the structure of the upstream side of the hyperbolic arch dam body caused by freezing is reduced.

The utility model discloses a children's rice flour fermentation storage tank with a pressure relief structure, which comprises a bottom bearing plate, a fermentation tank body is arranged above the bottom bearing plate, a sealing cover is arranged above the fermentation tank body, and an automatic pressure relief mechanism is arranged at the top of the sealing cover. The child rice flour fermentation storage tank with the pressure relief structure is provided with a pressure relief opening, an exhaust pipe, an electromagnetic valve, a wire, a PLC logic controller, a liquid level sensor and a pressure sensor, when the child rice flour fermentation storage tank with the pressure relief structure is used, after the pressure sensor senses that air pressure reaches a preset threshold value, the electromagnetic valve on the exhaust pipe is opened, and air is exhausted outwards along the pressure relief opening and the exhaust pipe; along with outward discharge of gas, liquid in the fermentation tank body expands to form foam, the liquid level quickly moves upwards, when the liquid level sensor senses that the liquid level moves upwards, the electromagnetic valve is closed for ten seconds, and the electromagnetic valve is opened after the liquid level descends, so that the function of facilitating automatic pressure relief is realized, and the problem that the device does not have the function of facilitating automatic pressure relief is solved.

The invention relates to the technical field of liquid heaters, in particular to a liquid heater. Comprising an end cover, a liquid inlet connector and a liquid outlet connector, the liquid inlet joint and the liquid outlet joint are communicated with the lower surface of the end cover; the end cover is electrically connected with the positive electrode and the negative electrode of the heating wire, a leakage protector and a liquid level sensor; the center of the lower surface of the end cover is communicated with the liquid inlet joint and is provided with a straight-through pipe; the lower position of the outer wall of the end cover is locked with a fixing sleeve through a locking ring; the upper end of the fixing sleeve is in sealing contact with the lower surface of the end cover; according to the liquid heater, the container pipe is controlled to move along the outer wall of the fixing sleeve, the container pipe and the fixing sleeve are locked in cooperation with the bolts, and therefore the volume adjusting process of the liquid heater is achieved, and compared with an existing liquid heater with the fixed volume, the liquid heater is higher in universality.

The invention relates to the technical field of plastic granulation, in particular to an opposite flow cooling device and a polymer plastic granulator. The opposite flow cooling device comprises a water cooling tank, a cooling device and a cooling device, wherein a bearing structure is arranged in the water cooling tank in the length direction of the water cooling tank; the control assembly is used for being connected with the water cooling tank and the bearing structure, a liquid level sensor is arranged at the top of the control assembly, and the liquid level sensor can adjust the control assembly to act according to the real-time water level in the water cooling tank so that the bearing structure can be located at the half position of the water level; the circulating assembly is arranged on the water cooling tank, two sets of sleeving pipes are arranged on the circulating assembly, and the cooling liquid entering the circulating assembly can be sprayed out through the sleeving pipes; and the traction structure is used for connecting the control assembly and the sleeving pipe, and the traction structure can change the spraying angle of the cooling liquid when the control assembly acts, so that the cooling effect is improved. The macromolecular plastic granulator comprises the opposite flow cooling device, a hot melt extrusion device and a granulating device.

The invention discloses a controllable low-energy-consumption alkali liquor generating device for seawater hydrogen production and a control method, and the device comprises a cylindrical metal liner which is internally provided with alkali liquor, is provided with a second interface at the bottom, and is communicated with an alkali liquor electrolytic bath through an alkali liquor circulating pipeline; a selective permeable diaphragm is attached to a half area of the side wall of the inner container, and pure water is sucked into the inner container by utilizing the osmotic pressure difference between alkali liquor and external seawater, so that seawater desalination is realized; a liquid level sensor is mounted at the top of the liner, and the alkali liquor concentration is calculated by detecting the liquid level height; the rotary shell is arranged outside the inner container in a sleeving manner, and the contact area between the selective permeable diaphragm and seawater is adjusted through self rotation, so that the seawater desalination rate is adjusted; wherein the rotation of the rotary housing is controlled by a power and transmission mechanism. According to the invention, a user is allowed to dynamically adjust the seawater desalination rate according to the water consumption rate of the electrolytic hydrogen production equipment, the alkali liquor in the electrolytic hydrogen production equipment is maintained at the concentration with the optimal electric conductivity, and the efficiency of the seawater hydrogen production equipment is improved.

The invention discloses a liquid leakage monitoring method and system for a liquid cooling charging pile. The method comprises the following steps that liquid level information of cooling liquid in a liquid cooling pot is detected through a six-section type liquid level sensor; temperature information at the joint of the two charging guns is detected through the two temperature sensors; temperature information of the radiator inlet and outlet is detected through a temperature sensor; detecting pressure information of a water inlet of the water pump through a pressure sensor; opening or closing of the pipeline water inlet is controlled through the flow switch; and the monitoring system monitors the liquid leakage condition of the charging pile through the collected liquid level information, temperature information and pressure information in combination with a liquid leakage detection algorithm, and carries out corresponding liquid level alarm according to the liquid leakage condition. The problems that monitoring is not timely and not intelligent in the prior art are solved, the problem of cooling liquid leakage is found and processed in time through intelligent algorithm control, a high-precision sensor and real-time monitoring, and safe operation of the liquid cooling charging pile is ensured.

The invention provides a liquid cooling CDU system with an intelligent pressure balance tank, and relates to the technical field of electronic equipment heat dissipation, and the system comprises a main circulation loop, the intelligent pressure balance tank, a liquid supplementing loop, a control system and a monitoring module. The intelligent pressure balance tank is provided with a liquid level sensor set, an exhaust valve installed on the non-top portion and a mechanical pressure release valve. The installation height of the exhaust valve is preset so that a buffer air layer can be reserved. The control system responds to signals of the liquid level sensor and controls opening and closing of the liquid supplementing loop and the exhaust valve. Through the design of a buffer air layer and a non-top valve group of the intelligent pressure balance tank, automatic liquid supplementing and graded pressure protection logic are combined, the problems of manual liquid supplementing lag, large pressure fluctuation, high safety risk and the like of a traditional liquid cooling CDU system are solved, and the liquid cooling CDU system is suitable for efficient heat dissipation of a data center and high-power electronic equipment.

The invention discloses an intelligent agent-based oil field station unattended intelligent operation and maintenance centralized control method and system, and belongs to the technical field of oil field station intelligent operation and maintenance management. The system comprises a data acquisition module, a data summarization decision module, a station coordination execution module, an emergency intervention module and an output module; pressure sensors, temperature sensors, flow sensors, liquid level sensors and water content sensors are arranged at oil field inter-well stations, transfer stations and united stations, and crude oil conveying equipment data of the inter-well stations, the transfer stations and the united stations are collected in real time. According to the intelligent agent-based unattended intelligent operation and maintenance centralized control method and system for the oil field station, station correlation analysis, instant optimization adjustment strategy and target optimization adjustment strategy generation, station specific parameter execution, feedback and optimization adjustment strategy fine adjustment and decision process recording can be realized, and a large model and a small model are closely combined; and an up-and-down collaborative hierarchical control framework is formed, so that the practicability and functionality are enhanced.

A sensor device for measuring the level of material in a container, including: a shell, and at least one contactless level sensor housed inside the shell, the shell including a measurement window enabling the passage of a detection signal emitted by the sensor and the passage of a reflected detection signal, after reflection against the free surface of the material inside the container. The sensor device further includes a fastener secured to the shell, enabling the removable fastening of the sensor device outside the container, on a connector secured to the container, with the measurement window of the shell positioned opposite a corresponding opening formed in the container.

The utility model discloses a medicament feeding device for water pollution control, and belongs to the technical field of flue gas purification equipment. Comprising a treatment box, a fixing box is arranged at the top end of the treatment box, a stirring assembly is arranged in the fixing box, and a quantitative feeding assembly is arranged on one side of the fixing box. When the feeding barrel is full of the medicine, the electromagnetic control valve is closed, wastewater enters the treatment box, a liquid level sensor makes contact with the wastewater and sends a signal to a control panel, the control panel closes a water inlet valve, an electric push rod is started, and a piston is pushed downwards; by controlling the stroke of the electric push rod and downward extrusion of the piston, the medicament is extruded and dispersed into the wastewater in batches through the flow dividing pipe, and the structure can automatically supplement the medicament and quantitatively spray the medicament into the wastewater for mixing treatment.

The invention relates to the technical field of liquid level detection, in particular to a method for eliminating a false liquid level of a urea hydrolyzer, which comprises the following steps: S1, acquiring a liquid level sensor signal, a pressure sensor signal, a temperature sensor signal and an ultrasonic reflection signal of the urea hydrolyzer in real time; s2, performing weighted fusion to generate fused liquid level characteristic parameters; s3, identifying false liquid level characteristics caused by foam layer coverage or steam interference; s4, generating a calibration liquid level value according to the false liquid level characteristics; and S5, comparing the calibrated liquid level value with a preset liquid level-pressure-temperature relation model, and outputting a real liquid level value. According to the invention, by fusing various sensor signals in real time, dynamically adjusting the parameters of the liquid level sensor and combining the liquid level-pressure-temperature relation model, false liquid level interference is accurately eliminated, the accuracy and reliability of liquid level measurement are improved, meanwhile, the equipment safety is ensured, and abnormal operation caused by false liquid level signals is prevented.

The invention provides an automatic liquid supplementing system of a rack-mounted CDU, which is arranged in a rack and comprises a liquid supplementing pipeline, a secondary side circulation pipeline and a control module, a liquid supplementing water tank, a liquid supplementing pump and a liquid supplementing pipe are arranged on the liquid supplementing pipeline, a liquid level sensor for detecting the liquid level is arranged on the liquid supplementing water tank, a liquid outlet end of the liquid supplementing pump is connected with the secondary side circulation pipeline, and a liquid outlet end of the liquid supplementing pump is connected with the secondary side circulation pipeline. The liquid inlet end is connected with a liquid supplementing water tank or a liquid supplementing pipe, and the liquid supplementing pipe is connected with a liquid storage device arranged outside the rack through a quick connector corresponding to an internal liquid supplementing mode or an external liquid supplementing mode; a pressure detection mechanism is arranged on the secondary side circulation pipeline, and the control module can control automatic liquid supplementing or liquid supplementing stopping and the liquid supplementing mode according to the pressure value detected by the pressure detection mechanism and the liquid level value detected by the liquid level sensor. By monitoring the pressure and the liquid level of the cooling medium in real time, automatic switching between an external liquid supplementing mode and an internal liquid supplementing mode can be achieved, automatic liquid supplementing is achieved, and the system stability and the operation and maintenance efficiency are improved.

The invention provides a circulating ink supply control method and a circulating ink supply control system, which are applied to a control unit in the circulating ink supply system. The method comprises the following steps: acquiring liquid level information detected by each liquid level sensor in an ink inlet unit and liquid level information detected by each liquid level sensor in an ink return unit in real time; according to the liquid level information detected by each sensor in the first sensor group, whether the circulating ink supply system is in a normal state is determined; if yes, the circulating pump or the air pump is controlled to conduct ink supply circulation according to the liquid level information detected by all the sensors in the second sensor set. The running speed of the circulating pump or the air pump is controlled through the liquid level information detected by all the liquid level sensors, it is guaranteed that the air pressure in the circulating ink supply system is stable, and therefore the ink supply amount of the spray head is stable, and the printing effect of a final model is guaranteed.

Provided in the present application are a humidification system and humidification method for fuel cells. The humidification system comprises a fuel cell stack, a first pressure-reducing valve, a gas-liquid separator, a first switching valve, a second switching valve, a liquid storage tank, a third switching valve, a fourth switching valve, a second pressure-reducing valve, an atomizer and at least one liquid level sensor, wherein a detection end of the liquid level sensor is located in the liquid storage tank.

The invention provides a diaphragm type optical fiber liquid level sensing demodulation device and method based on a microwave photon technology, and the device comprises a broadband light source, a circulator, a diaphragm type optical fiber liquid level sensor, an erbium-doped optical fiber amplifier, a polarization controller, a DC power supply, a radio frequency source, an electro-optical modulator, a dispersion compensation optical fiber, a photoelectric detector and a power meter. The broadband light source is connected with a first port of the circulator, a second port of the circulator is connected with the diaphragm type optical fiber liquid level sensor, a third port of the circulator is connected with the erbium-doped optical fiber amplifier, the erbium-doped optical fiber amplifier is connected with the polarization controller, and the polarization controller is connected with the input end of the electrooptical modulator. The radio frequency source is connected with the modulation input of the electro-optical modulator, the direct current power supply is connected with the bias voltage input of the electro-optical modulator, the output of the electro-optical modulator is connected with the photoelectric detector through the dispersion compensation optical fiber, and the photoelectric detector is connected with the power meter, so that the measurement range is expanded while the sensing sensitivity and the resolution ratio are improved.

The invention discloses a single ultrasonic mud liquid level measuring system and method based on machine learning. The system comprises an ultrasonic liquid level sensor, a signal processing unit, a machine learning module, a physical model constraint module, a calculation unit, a display unit and a continuous learning and online updating module. According to the method, the accuracy of mud liquid level measurement in petroleum drilling and the robustness of the system are improved, more accurate and stable liquid level data can be provided in a complex drilling environment by integrating multiple machine learning models and applying a model integration technology, the defects that a traditional single model is large in dependence and prone to being disturbed are overcome, and the method is suitable for popularization and application. The reliability of prediction data is improved, and the safety and effectiveness of drilling operation are ensured.

The utility model relates to a secondary ink cartridge assembly for a printer, which comprises a secondary ink cartridge body, the secondary ink cartridge body comprises an ink cartridge body and an ink cartridge cover which are mutually sealed and covered, a high-pressure ink cavity, a low-pressure ink cavity and a normal-pressure ink cavity are arranged in the ink cartridge body, and the high-pressure ink cavity, the low-pressure ink cavity and the normal-pressure ink cavity are respectively provided with a liquid level sensor. The high-pressure ink cavity is sequentially communicated with the printing spray head, the low-pressure ink cavity, the normal-pressure ink cavity, the second ink pump, the bubble removing device and the first ink pump, so that ink flows out of the high-pressure ink cavity, sequentially flows through the printing spray head, the low-pressure ink cavity, the second ink pump, the normal-pressure ink cavity, the first ink pump and the bubble removing device and then flows back into the high-pressure ink cavity, and therefore a self-circulation ink path is formed. According to the secondary ink box, ink between the secondary ink box body and the printing spray head keeps continuous circulating flow, precipitation is avoided, the temperature of the ink entering the printing spray head is appropriate and constant, the bubble content is small, the pressure fluctuation is small, and therefore the printing quality is higher, and the printing effect is better.

The utility model discloses a cutting fluid storage box, a cutting fluid health management system, a numerical control machine tool and a system, the cutting fluid storage box is used for the numerical control machine tool, the cutting fluid storage box comprises a processing fluid outlet and a processing fluid return port, and the cutting fluid storage box further comprises a management fluid outlet and a management fluid return port; a pipeline, a management water pump and a temperature controller are arranged between the management liquid outlet and the management liquid return port, a liquid outlet temperature sensor and a filter are arranged on the pipeline between the temperature controller and the management liquid outlet, and a liquid return port temperature sensor is arranged on the pipeline between the temperature controller and the management liquid return port. A temperature sensor, a PH sensor and a liquid level sensor are arranged in the cutting fluid storage box, an electromagnetic valve is arranged on the pipeline, the electromagnetic valve, the temperature sensor, the PH sensor, the liquid level sensor and the temperature controller are all connected with a control unit, and the control unit transmits temperature adjusting signals to the temperature controller. The state of the cutting fluid can be monitored, the temperature of the cutting fluid is adjusted, and the machining quality is improved.

The invention relates to the technical field of liquid ammonia liquid level meters, in particular to a liquid ammonia liquid level meter capable of automatically cleaning impurities and a method thereof.The liquid ammonia liquid level meter comprises a sampling pipe and a floating ball liquid level sensor installed in the sampling pipe, the floating ball liquid level sensor is used for detecting the position of a floating ball and the height of the liquid level, and the floating ball liquid level sensor transmits detection data to a processor; a heat tracing pipe is arranged on the outer wall of the sampling pipe, a flow meter for introducing inert gas is arranged at the upper end of the sampling pipe, and a blow-down valve is arranged at the lower end of the sampling pipe. Whether the floating ball is stuck or not is judged by automatically detecting the position of the floating ball, then cleaning is achieved by heating and nitrogen introduction for purging under the condition that the floating ball is stuck, and due to the integrated automation technology, the accuracy of liquid level measurement of liquid ammonia and the stability of the system are remarkably improved. According to the device, impurities attached to the liquid level meter can be removed in time, the floating ball is prevented from being jammed, and accuracy and reliability of liquid level measurement data are ensured.

A dual-channel switching system for a wastewater treatment plant, and an operation method. The double-channel switching system comprises a water intake box culvert in communication with both a dry-season treatment system and a rainy-season treatment system, wherein the dry-season treatment system comprises a coarse-fine combined screen connected to a grit chamber, a membrane screen device, an AAO combined tank, an MER reaction tank and a first ultraviolet disinfection channel in sequence; the rainy-season treatment system comprises a self-cleaning screen connected to a flow control valve, a combined storage tank, a magnetic precipitation system, a fiber rotary disc filter and a second ultraviolet disinfection channel in sequence; the water intake box culvert is provided with a liquid level sensor, a sludge concentration sensor, and a flow rate sensor; a switching valve is provided at the front end of the self-cleaning screen; and the liquid level sensor, the sludge concentration sensor and the flow rate sensor are connected to a control unit In the present invention, a wastewater treatment path can be automatically adjusted on the basis of changes in seasons and water volumes, thereby effectively meeting wastewater treatment requirements in a dry season and a rainy season.

The utility model relates to the technical field of liquid level sensors, in particular to a capacitive liquid level sensor. Through a mounting plate and an outer electrode tube fixedly mounted on the mounting plate, an inner electrode is mounted in the outer electrode tube, a tube cavity of the outer electrode tube is divided into a first tube cavity and a second tube cavity, the inner electrode comprises a first metal wire and a second metal wire, the first metal wire is positioned and mounted in the first tube cavity through a first protective sleeve, and the second metal wire is positioned and mounted in the second tube cavity through a second protective sleeve. The second metal wire is positioned and mounted in the second pipe cavity through the second protective sleeve; and the upper ends of the first metal wire and the second metal wire penetrate out of the mounting plate to form leading-out ends of the inner electrode. Through the structure, the first metal wire and the first pipe cavity as well as the second metal wire and the second pipe cavity form two cylindrical capacitors, so that the measured data is more stable and accurate, and the long-time use of the liquid level sensor can be ensured.

The acupuncture and moxibustion auxiliary operation device comprises an outer shell, an inner shell and a controller, a fixing assembly is installed on the outer side wall of the outer shell, a rotating assembly is installed on the inner top wall of the outer shell, an opening is formed in one end of the inner shell, a first pressure sensor is installed at the opening, and a connecting rod is fixedly connected to the inner top wall of the inner shell; the connecting rod is provided with a plurality of leaking holes and connected with a power part, a force storage shell is installed outside the power part, a strain gauge is embedded in the side wall of the force storage shell, the bottom of the force storage shell is communicated with a needle pushing assembly, the needle pushing assembly comprises a shell, a needle clamping device is in sliding fit with one end of the shell, a pushing plate is in sliding fit with the interior of the shell, and the space between the pushing plate and the needle clamping device is filled with liquid. And a liquid level sensor is embedded in the shell. The problems that in the traditional acupuncture treatment process, the dependence on the skills of doctors is high, operation is tedious, and the control over the needle inserting depth and the needle twisting angle is inaccurate are solved.

The invention provides an oil level monitoring and leakage early warning system for a hydraulic system of a dredger, which relates to the technical field of hydraulic system monitoring and comprises a hydraulic oil tank, an actuating mechanism assembly connected with the hydraulic oil tank through a pipeline, a data processing unit, a multi-source sensing module, an early warning module and a control module, the multi-source sensing module comprises an integrated liquid level sensor, an actuating mechanism displacement sensor group, an attitude sensor and a temperature sensor, and is used for collecting hydraulic oil level, displacement of each actuating mechanism, ship trim / heeling angle and oil temperature data in real time; the dynamic compensation calculation module is connected with the data processing unit; and the intelligent early warning module is connected with the data processing unit. Normal change and leakage can be distinguished by calculating the oil level change caused by the action of the executing mechanism and the posture of the ship, early warning is conducted in time, pollution and economic losses are prevented, and the situation that when workers inject hydraulic oil, the hydraulic oil splashes, bubbles are generated, and a hydraulic element is damaged can be prevented.

The utility model discloses a dandelion cultivation box, and belongs to the technical field of dandelion cultivation. The device mainly comprises a bottom plate; the cultivation box mechanism is used for planting dandelions and supplementing water to the dandelions, and the cultivation box mechanism is provided with three sets of cultivation box bodies; a water tank automatic supply mechanism; a drain pipe is mounted on the water supply tank; the drain pipe and the water inlet pipe are respectively communicated with a first electromagnetic valve and a second electromagnetic valve; the three groups of mounting pipes are communicated and mounted on the supply water tank, and the mounting pipes are in threaded connection with liquid level sensors; the water pump is provided with an output pipe; and the control instrument is mounted on the water supply tank. According to the dandelion cultivation box, through the water inlet pipe, the water outlet pipe, the first electromagnetic valve, the second electromagnetic valve, the mounting pipe, the liquid level sensor and the control instrument, the liquid level sensor is used for detecting the liquid level in the water supply tank, and the effect of automatically controlling the water inlet pipe and the water outlet pipe according to the liquid level is achieved.

A beverage dispenser having a beverage-level indicating system. The beverage dispenser includes a housing and a dispensing head arranged on the housing for dispensing a beverage into a beverage container. The beverage dispenser further includes a beverage-level sensor arranged on the housing and which determines a beverage level within the beverage container without contacting the beverage within the beverage container, a beverage-level indicator that provides a visual indication of the beverage level within the beverage container, and a control unit that causes the beverage-level indicator to indicate the beverage level within the beverage container based on the beverage level as determined by the beverage-level sensor.