2079results about "Water conservation" patented technology

The invention discloses a self-adaptive metering method of an ultrasonic water meter, which relates to the field of water meter metering, and comprises the following steps: acquiring real-time water temperature data and real-time flow velocity data of a measured fluid, compensating the sound velocity of ultrasonic waves based on the real-time water temperature data to obtain a first compensated sound velocity, based on the first compensation sound velocity, an excitation voltage self-adaptive adjustment strategy with ultrasonic wave head-wave ratio regulation and control and a measurement frequency dynamic regulation and control strategy are executed, secondary compensation is conducted through a built error curved surface compensation model with the water temperature and the flow velocity as indexes, and the initial flow value is corrected through an error compensation value; by means of multi-parameter collaborative real-time optimization, high-precision measurement and low-power-consumption operation under all working conditions are achieved, the measurement precision in the full-scale and full-temperature range is remarkably improved, and by intelligently adjusting the measurement frequency, cooperating with the flow rate change rate and error model feedback and dynamically balancing the dynamic response speed and static power consumption, the measurement precision is improved. And finally, double optimization of precision and energy efficiency is achieved.

The invention discloses an indoor water tank sediment pushing characteristic acquisition system and method, the system mainly comprises a water tank main body, a buffer unit, a drainage adjusting unit, a sediment throwing device, an imaging unit, an adjustable support and a data processing unit, and according to the method, non-contact data acquisition is carried out through a high-definition camera and a three-dimensional terrain measuring instrument; automatic identification, parameter extraction and migration speed calculation of landforms such as sand waves are achieved, the sediment bed surface is not touched in the whole process, damage to the bed surface form caused by traditional contact type measurement is eliminated, and the authenticity and reliability of data are ensured. Meanwhile, the buffer design of the combination of the flow slowing plate and the multi-stage water baffle is adopted, the kinetic energy of water flow is effectively dissipated through the graded water outlet structure, the impact force of injected water flow is greatly reduced, the bed surface is prevented from being scoured in the initial water injection stage, and the stability of the initial test condition is powerfully protected.

The invention discloses a metal tube float flowmeter based on an intelligent sensor, and relates to the technical field of float flowmeters, the metal tube float flowmeter comprises a tube body and a detection mechanism, an instrument is fixed on the outer side of the tube body through a bolt and used for realizing flow display, the instrument is connected with a Hall element, the detection mechanism used for flow detection is installed in the tube body, and the Hall element is connected with the detection mechanism. And the locking mechanism is used for realizing initial locking of the detection mechanism. According to the metal tube float flowmeter based on the intelligent sensor, the elastic regulation and control mechanism is arranged at the position of the liquid inlet of the tube body, peak kinetic energy of fluid is actively absorbed through elastic deformation of the first spring, and therefore the fluid entering the tube body can be buffered, pulsating flow of the external input fluid is effectively converted into stable flow, and the flow rate of the fluid is increased. Jumping of the floater body is greatly reduced, the problem that reading is difficult due to jumping of the floater body can be solved, the positive error of an average measured value caused by pulsation can be avoided, and the accuracy of detection data is guaranteed.

The invention discloses a coal mining water retention method, which comprises the following steps of: pre-calculating the height h0 of a water flowing fissure zone in a deep aquifer when the water yield Q2 of a coal mining mine is equal to the total water consumption Q1 of production and life of a mining area, and then calculating the corresponding mining height M0 when a coal seam below is mined according to the height h0 of the water flowing fissure zone; according to the mining height M0, the filling height M2 needing to be equivalently filled in the goaf is calculated, and materials are filled into the goaf behind along with advancing of the coal face during coal mining until the materials reach the height of M2, so that too high or too low development of the water flowing fissure zone can be inhibited, the filling height or thickness can be reduced, and the filling efficiency is improved. According to the method, the balance between the filling height of the goaf and the development height of the water flowing fractured zone is found in an equivalent filling mode, mine water generated during coal mining can meet the total water consumption of production and life of a mining area, the defects caused by complete filling can be avoided, the coal mining efficiency is improved, and the water retention effect is also improved.

The invention relates to the technical field of water meters, in particular to a character wheel-pointer type intelligent camera shooting water meter high-precision reading method and system. Comprising the following steps: positioning a character wheel area in a water meter image by adopting a rotating target detection model, and automatically correcting dial plate deflection by analyzing a deflection angle and geometrical characteristics of the character wheel area; and extracting a pointer and a pointer end region based on the corrected image, and calculating and obtaining a pointer reading by utilizing a long side slope of a pointer end bounding box. And finally, based on the pointer reading and the character wheel region, constructing a convolutional neural network classification model containing a carry state, and realizing digital reading by combining a dual-threshold carry correction algorithm, thereby realizing composite water meter reading. According to the method provided by the invention, high-precision reading can be realized under the influence of any deflection angle, indication error and mechanical carry precision difference, the processing speed reaches 74 milliseconds / frame, and the average pointer angle identification error is lt; and the method is particularly suitable for water meter automatic reading scenes in complex environments.

The invention discloses an all-working-condition air water production unit, which belongs to the technical field of air water production, and comprises a high-humidity air inlet channel, a low-humidity air inlet channel, a channel switching device and a water production channel, and the high-humidity air inlet channel and the low-humidity air inlet channel are both communicated with the water production channel; air flowing out of the high-humidity air inlet channel or the low-humidity air inlet channel enters the water production channel so that the water production channel can produce water. According to the invention, the high-humidity operation mode or the low-humidity operation mode is automatically switched according to the air inlet humidity. A traditional unit can only operate under a single working condition. According to the invention, the optimal energy efficiency and water production rate can be kept in different environments.

To provide a communication device or a water meter capable of providing dynamic water pressure.SOLUTION: Provided is a communication device 100 including an acquisition unit 175 for acquiring a flow rate from a water meter 200 or a slave device 100B, a communication unit 160 for communicating with a center 300, and a control unit 110 for calculating dynamic water pressure from the flow rate and transmitting the dynamic water pressure to the center via the communication unit.SELECTED DRAWING: Figure 2

The water meter dial reading recognition method of the present application responds to a trigger reading request instruction, collects an original water meter image; extracts a feature point set of the original water meter image, compares the feature point set of the original water meter image with a pre-stored feature mapping table to determine a dial image segmentation rule, and segments the original water meter image according to the corresponding dial image segmentation rule to obtain a plurality of image block data; by judging that the boundary of each image block data is clear and the boundary of the valid information in each image block data is clear, or judging that the boundary of each image block data is clear and the boundary of the valid information in at least one image block data is not clear, or judging that the boundary of any image block data is not clear, different recognition modes are selected, local device resources and remote device resources can be reasonably utilized, resources are saved, recognition efficiency is improved, and recognition scenarios with high real-time requirements are met.

The invention discloses a digital twin intelligent water-saving system based on a distributed optical fiber sensing network, which belongs to the technical field of water-saving management and specifically comprises the distributed optical fiber sensing network laid along a water delivery pipeline in a tree topology; the water use event recognition module collects optical fiber vibration signals, converts the optical fiber vibration signals into digital waveforms and recognizes trigger points through an amplitude threshold value; the water supply topology construction module constructs a water supply dependency topological graph containing nodes and directed edges according to the spatial position and time delay of the trigger point; a hydraulic model generation module superposes the topological graph and the digital map of the water delivery pipeline to generate a dynamic hydraulic balance model containing node water intensity weight coefficients; the intelligent water-saving control module sends a periodic intermittent closing instruction to the intelligent water valve of the low-weight node according to the node weight change, and the duration of the instruction is in direct proportion to the weight difference value of the adjacent node; according to the invention, refined intelligent water-saving management of a centralized water consumption scene is realized.

This application provides a constant pressure water supply control method, system, and medium for a standardized secondary water supply pump station. The method includes: acquiring and processing multiple historical water supply data points within a preset time period, including water supply time data, corresponding pump water supply pressure data, and user node water supply pressure data, to obtain the water supply pressure level and corresponding water supply pressure and time; processing this data in conjunction with the user node water supply pressure to obtain the pipeline pressure loss value corresponding to the water supply pressure level; acquiring and processing real-time water supply time point data to obtain the water supply pressure level, corresponding water supply pressure, and pipeline pressure loss value, to obtain the real-time demand water supply pressure of the pump; then implementing water supply and acquiring and processing real-time water supply pressure data from user nodes to obtain a real-time water supply evaluation index; finally, performing threshold comparison and adjusting the water supply mode based on the comparison results; thereby achieving constant pressure water supply and precise control of the secondary water supply while reducing energy consumption.

The invention relates to a tail end constant-pressure water supply strategy adjusting method and system based on AI, and belongs to the technical field of secondary water supply.The constant-pressure water supply strategy adjusting method comprises the steps that the flow of a header pipe and real-time health state data of each running pump are periodically collected; according to the header pipe flow, the dynamic demand lift is calculated, and all feasible pump set combination strategies are generated in combination with the dynamic demand lift and the real-time health state data; the score of each candidate strategy is calculated, the candidate strategy with the highest score is used as a pump set scheduling strategy, the pump with the most matched performance is selected from candidate pump sets corresponding to the pump set scheduling strategy to serve as a frequency conversion main guide pump, and the other pumps serve as frequency conversion auxiliary pumps; according to the set minimum service pressure and the dynamic demand lift, the target pressure of a pump outlet is calculated; and according to the target pressure and the actually-collected pump outlet pressure, the rotating speed of the variable-frequency main guide pump is adjusted. The method has the beneficial effects that the power of the pump set is matched with the actual requirement, so that the operation cost is reduced.

The invention relates to the technical field of water meters, in particular to an anti-blocking anti-freezing water meter which comprises a water meter box, a detachable first connecting pipe is arranged at one end of the water meter box, and a detachable second connecting pipe is arranged at the end, away from the first connecting pipe, of the water meter box. When cleaning is needed, an operator rotates a third sliding rod to drive a cleaning block on the side face of the third sliding rod to move so that the cleaning block can be tightly pressed on the outer wall of the filter box, then a rotating cylinder in a drainage structure is rotated to drive a second rotating ring fixedly connected with the rotating cylinder through a second connecting rod to rotate, and then the filter box is driven to integrally rotate; the static cleaning block continuously rubs with the outer surface of the rotating filter box, so that impurities attached to the peripheries of the filter holes are scraped, the cleaned impurities are washed by water flow and finally discharged out of the water meter through the opened rotating cylinder, the maintenance process is greatly simplified, and long-term smooth operation of the water meter is guaranteed.

The utility model discloses a cable-stayed truss side bottom water pressure balanced opposite-tie-bar-free easy-to-clean water tank, and relates to the technical field of water tanks, the cable-stayed truss side bottom water pressure balanced opposite-tie-bar-free easy-to-clean water tank comprises a bottom plate, a top plate module and side plate modules, and a plurality of bottom side pressure self-balancing truss combined components are evenly distributed on the inner side of each side plate module; the bottom side pressure self-balancing truss combined member comprises a first bottom side pressure self-balancing truss combined member and a second bottom side pressure self-balancing truss combined member. According to the bottom side pressure self-balancing truss combined component, factory assembling and welding are adopted in advance, standard and unified welding and splicing modules are formed, so that a welding component is combined, the influence caused by external factors and welding operation is reduced to a great extent, the bending resistance and the tension resistance of the bottom side pressure self-balancing truss combined component are utilized, and the welding efficiency is improved. The bottom side pressure self-balancing truss combined component can safely and reliably transfer water pressure borne by the side plates to the upper top plate and the lower bottom plate to form a stable water tank structure system, so that opposite-pulling through ribs on the two sides are omitted, the internal moving space is large, and follow-up water tank welding, manual cleaning and construction maintenance are greatly facilitated.

The utility model discloses a highway bridge pavement water seepage detection device which comprises a water supply mechanism, the top of the water supply mechanism is fixedly provided with a water containing cylinder used for detecting water bearing, the water supply mechanism is fixedly provided with a balancing weight, and the top of the water supply mechanism is provided with an air escape valve in a penetrating mode. A jacking mechanism making contact with the top of detection water is slidably connected into the water containing barrel, and an identification mechanism facilitating observation of the water falling speed is arranged at the top of the water supply mechanism. The water supply mechanism is placed on the asphalt pavement needing to be detected, then the water supply mechanism is turned on to supply water, gas at the bottom of the water supply mechanism can be discharged through the gas release valve at the moment, then the water containing barrel is filled with the gas, and then the jacking mechanism falls down after water falls down. In this way, a user can observe the water falling position on the identification mechanism with the higher height according to the jacking mechanism, the detection device can detect the water seepage condition more conveniently, and detection is more accurate.

The utility model discloses a rock sample water saturation device, which relates to the technical field of rock water saturation and comprises a flexible water saturation cover, a water supply component and a pressurizing component. A sealed saturated water cavity is formed in the flexible saturated water cover, the saturated water cavity is used for accommodating a rock sample, and the flexible saturated water cover can be flexibly deformed, so that the saturated water cavity is matched with the rock sample in shape; the water supply assembly comprises a water supply pipe and a water storage structure, two ends of the water supply pipe are respectively communicated with the saturated water cavity and the water storage structure, and the water storage structure is used for storing water; the pressurizing assembly comprises a pressurizing pipe, a sucking pump and a pressurizing tank, the sucking pump is communicated with the pressurizing tank, and two ends of the pressurizing pipe are respectively communicated with the saturated water cavity and the pressurizing tank. The water saturation device for the rock sample provided by the utility model can be suitable for rock samples with different shapes and sizes, and the water saturation treatment effect on the rock can be effectively improved.

The boiler softened water tank comprises a softened water tank body and a support, the bottom of the softened water tank body is fixedly connected with the support, the left side of the softened water tank body is fixedly connected with a liquid level sight glass, the surface of an emptying pipe is fixedly connected with an emptying valve, the bottom of the right side of the softened water tank body is communicated with a boiler pipe, and the bottom of the boiler pipe is communicated with a vacuum suppressor. The utility model relates to the technical field of boiler softened water tanks, a small liquid level control tank is installed outside the tank, a vacuum suppressor is installed at the top of the liquid level control tank and used for exhausting air when water enters, a floating ball valve is installed in the tank and connected with the softened water tank through a U-shaped bend, and the soft water tank is connected with the vacuum suppressor. The normal temperature is kept, the service life of the sealing piece is prolonged, the sealing piece can be maintained in time without shutdown when damaged and is not influenced by use and hot water in the tank, and the problem that the sealing piece of the floating ball valve is used at high temperature for a long time and is easy to age to cause water leakage is solved.

The invention discloses a timed and quantitative full-automatic intelligent water replenishing method and system, and relates to the technical field of intelligent water replenishment, and the method comprises the steps: generating a dynamic water replenishing control signal based on municipal pipe network pressure data, water tank liquid level height and water replenishing flow data which are monitored in real time; dividing and defining a water supplementing flow threshold range of a corresponding time period according to a preset time period, adjusting the opening degree of an electric adjusting valve based on the dynamic water supplementing control signal, supplementing water, and when it is monitored that the pressure of the municipal pipe network is lower than a preset protection threshold value, attenuating the water supplementing flow through a dynamic pressure compensation mechanism, and maintaining the stability of the pressure of the pipe network; predicting the water demand in the future time period, updating the target liquid level, and when the liquid level of the water tank reaches the target liquid level, triggering a redundancy protection mechanism to forcibly stop water replenishing. By introducing a dynamic pressure compensation mechanism, flow regulation and chaos disturbance factor feedback, the pipe network pressure stability, the water replenishing flow regulation precision and the response speed are optimized, the actual water use requirement is met, and the safety and the energy efficiency are improved.

The utility model discloses a water tank and a cleaning machine, and relates to the technical field of electric appliances, the water tank comprises a tank body, and a first water cavity and a second water cavity are arranged in the tank body at an interval; the box body is provided with a first water inlet and a first water outlet which are communicated with the first water cavity, the first water inlet is used for allowing external hot water to enter the first water cavity, and the first water outlet is used for outputting the hot water in the first water cavity; the box body is provided with a second water inlet and a second water outlet which are communicated with the second water cavity, the second water inlet is used for allowing external normal-temperature water to enter the second water cavity, and the second water outlet is used for outputting the normal-temperature water in the second water cavity; hot water output by the first water outlet is used for being mixed with normal-temperature water output by the second water outlet, hot water provided by a municipal water supply system can flow into the first water cavity from the first water inlet, the normal-temperature water can flow into the second water cavity from the second water inlet, and the water tank can be directly matched with the normal-temperature water and the hot water supplied by the water supply system. No additional heating device is needed, and the applicability is high.

The invention discloses an ultrasonic water meter flow measurement method and system based on dynamic temperature compensation, and relates to the technical field of ultrasonic water meter flow measurement. According to the ultrasonic water meter flow measurement method based on dynamic temperature compensation, flow measurement time sequence data in a set area are continuously obtained, feature extraction processing is carried out respectively, an initial flow measurement value, a temperature compensation factor and a measurement interference suppression factor of each sampling period in the set area are obtained, comprehensive analysis is carried out, and the flow measurement time sequence data are obtained. According to the method, intelligent alarm is carried out on the set area based on the actual flow measurement value of each sampling period, so that the original measurement result is dynamically corrected, and a more accurate actual flow value is formed; the reliability and the long-term stability of flow measurement in complex environments such as severe temperature difference and fluctuating flow state are improved, and then the accuracy and the usability of flow monitoring in scenes such as hot spring areas and industrial heat exchange pipelines are guaranteed.

The invention belongs to the technical field of intelligent instruments, and relates to a remote monitoring system of an intelligent water meter. Through a method of combining data acquisition and processing, dynamic baseline modeling and network topology analysis, the problems that a traditional water supply system is difficult to accurately identify and position abnormal water consumption, equipment leakage and failure and the like are solved. The method comprises the following steps: firstly, acquiring cleaning water data by a system, and establishing a dynamic water behavior baseline model for each user; secondly, combining pipe network topology and pressure partition information to construct a comprehensive evaluation network; then, through real-time data comparison and spatial correlation analysis, abnormal types are accurately identified; and finally, accurately positioning an abnormal position and an influence range according to a network structure. According to the system, early warning and accurate positioning of abnormal events of the water supply network are realized, and when leakage occurs, hydraulic propagation characteristics can be automatically identified and leakage points can be positioned; when abnormal water consumption or equipment failure occurs, the influence area can be evaluated in time, and a scientific decision basis is provided for intelligent management of water supply enterprises.

The invention discloses an intelligent water meter remote monitoring method and system based on the Internet of Things, and belongs to the field of intelligent water meters, and the method comprises the steps: obtaining real-time water consumption data from an intelligent water meter, and transmitting the real-time water consumption data to a cloud server through an Internet of Things protocol to obtain a structured water consumption data set; aiming at the structured water consumption data set, separating trend, period and noise components by adopting a time sequence decomposition method to obtain water consumption mode characteristics; constructing a self-adaptive clustering model according to the water consumption mode characteristics, identifying dynamic water consumption modes of different users, and determining the water consumption behavior classification of the users; for the water consumption data judged to be abnormal, analyzing short-term water consumption fluctuation by adopting a time sequence prediction model to obtain persistence characteristics of abnormal behaviors; according to the long-term trend characteristics, predicting the equipment fault probability by adopting a machine learning classification algorithm to obtain an equipment maintenance priority sequence; and generating a dynamic water consumption management report by aiming at the equipment maintenance priority ranking and combining the persistence characteristics of the abnormal behaviors.

The utility model relates to the technical field of negative pressure devices, in particular to a water circulation negative pressure device which comprises a negative pressure tank connected with a negative pressure pipe. The inlet end of the water circulation vacuumizing assembly is communicated with the negative pressure tank through an air inlet pipe, the outlet end of the water circulation vacuumizing assembly is connected with a circulating water assembly through an exhaust pipe, and the circulating water assembly is provided with an exhaust port; and one end of the drainage pipe is connected with the lower end of the circulating water assembly, the other end of the drainage pipe is connected with the inlet end of the water circulation vacuumizing assembly, a first valve control assembly is installed on the drainage pipe, and the first valve control assembly is electrically connected with the control assembly. Noise and energy consumption are reduced, and the device is not sensitive to impurities in gas.

The meter shell comprises a meter shell main body part and is characterized in that the right side of the meter shell main body part is provided with a horizontally-arranged pipe body, the left end of the pipe body is communicated with the meter shell main body part, the right end of the pipe body is closed, the upper portion of the pipe body is communicated with a water outlet connector, and the lower portion of the pipe body is communicated with a water inlet connector; a horizontal partition plate is arranged in the pipe body and divides an inner cavity of the pipe body into a water inlet channel and a water outlet channel which are independent of each other, the water inlet channel is arranged below the water outlet channel, one end of the water inlet channel is communicated with the water inlet connector, and the other end of the water inlet channel is communicated with an inner cavity of the meter shell body part. One end of the water outlet channel is communicated with the inner cavity of the meter shell main body part, the other end of the water outlet channel is communicated with the water outlet connector, and a ball valve is arranged at the intersection of the water outlet channel and the water outlet connector. The invention has the advantages of simple structure and smaller volume.

The invention provides an ultrasonic water meter fluctuation intelligent judgment method based on multi-dimensional feature fusion and a dynamic model. Firstly, multi-dimensional original data such as instantaneous flow, transition time, signal amplitude and water temperature of the ultrasonic water meter are synchronously collected; extracting a flow characteristic, a transition time composite characteristic and a signal quality characteristic in the sliding time window to form a characteristic vector; performing normalization processing and weighted calculation to obtain a total fluctuation intensity score FIS, if the total fluctuation intensity score FIS is less than or equal to a calm threshold, determining that the state is a normal stable state, otherwise, inputting a fine classification model; and finally outputting a fluctuation state label and a corresponding alarm or report. The method does not need extra hardware cost, improves the accuracy and fineness of abnormality diagnosis, adapts to water use habits and pipe network working condition changes, and provides technical support for intelligent pipe network management. According to the method, hardware cost does not need to be increased, the accuracy and fineness of anomaly diagnosis are greatly improved, and powerful technical support is provided for predictive maintenance and intelligent pipe network management.

The invention discloses an on-line water meter fault alarm detection device which comprises a water meter shell, a linkage device is arranged in the water meter shell and connected with a rotating shaft in the water meter shell, the upper end of the rotating shaft is rotationally connected with a rotor wing machine core, the rotor wing machine core is connected with a meter hand, a linkage gear is connected with a rotating shaft, and the rotating shaft is connected with a linkage gear. The camera is electrically connected with the fault detection mechanism, a water flow speed measurement sensor is arranged in the water meter shell, and the camera, the water flow speed measurement sensor and the rotary displacement sensor are electrically connected to a first early warning processor of the fault detection mechanism. Whether the water meter pointer rotates or not can be rapidly determined through the early warning detection mechanism, meanwhile, whether the impeller rotates under flowing of water flow or not is determined in the water meter shell, and whether the water meter runs or not is determined bidirectionally, so that whether the water flowing condition exists in water meter faults or not is guaranteed; and meanwhile, the linkage device is used for quickly warning the condition that water flows and the meter does not flow.

The utility model discloses a high-sealing low-error anti-slip water meter which comprises a detection mechanism, first flanges are fixedly connected to the two sides of the detection mechanism, and second flanges are arranged on the sides, away from the detection mechanism, of the first flanges. The water meter is excellent in measurement error and anti-idling effect, the anti-backflow pipes on the left side and the right side of the water meter can effectively prevent water flow from flowing back, when the water flow flows forwards, water pressure pushes the rubber pad and the supporting disc to enable the water flow to pass through gaps, if the water flow flows back, the water pressure enables the rubber pad and the fixing ring to be attached more tightly, backflow is prevented, and the water meter is convenient to use. And the metering error caused by idling is reduced. In the aspect of sealing performance, the adjacent sides of the first flange and the second flange are provided with the annular grooves, the sealing rings are arranged in the annular grooves, the protruding parts of the sealing rings are inserted into the annular grooves, the contact area is greatly increased, the occurrence probability of leakage channels is reduced, the sealing performance is greatly improved, and the device has the advantages of being small in measurement error, good in anti-idling effect and good in sealing performance.

The utility model discloses a water sampler device with strong leakproofness, which relates to the technical field of sampling devices and comprises a barrel body, a cover sealing device is arranged on the barrel body, a sealing device is arranged on the barrel body and used for movably plugging an opening in the bottom of the barrel body, and the sealing device comprises a sliding rod movably penetrating through the barrel body. The top of the sliding rod is provided with a balancing weight used for balancing the weight of the sliding rod, the bottom of the sliding rod is provided with a baffle used for movably blocking an opening in the bottom of the barrel body, the baffle is provided with a rubber pad used for movably making contact with the bottom of the barrel body, and the top of the sliding rod is provided with a pull rope used for assisting in lifting the sliding rod. The cover sealing device is used for overturning and sealing an opening in the top of the barrel body, the cover sealing device comprises a hinge arranged at the top of the barrel body, and the hinge is connected with a cover plate used for overturning and sealing the opening in the top of the barrel body, so that water can be stably collected, the water leakage condition is avoided, and liquid can be conveniently poured.

The utility model discloses a hydrostatic pressure distribution diagram demonstration device, which relates to the field of hydrostatic pressure demonstration and comprises a water tank structure, a demonstration structure is fixedly connected to the outer side of the water tank structure, the water tank structure comprises a water tank main body, the inside of the water tank main body is hollow, and a movable plate is in threaded connection with the top end of the water tank main body and comprises a sealing upper cover. According to the hydrostatic pressure distribution diagram demonstration device provided by the utility model, a water body in the water tank structure can be conducted into the demonstration structure by the demonstration device, and a plurality of groups of floating balls with different heights are arranged in the demonstration structure, so that the demonstration effect of the hydrostatic pressure distribution diagram is improved. The device can clearly demonstrate the distribution condition of the hydrostatic pressure at different water levels, is simple in structure, is easy to operate, facilitates the direct display of the hydrostatic pressure during classroom demonstration, and can directly indicate the increase of the pressure according to a linear rule along with the increase of the depth through the observation of the position of the floating ball.

To provide a water generator which can be miniaturized and can suppress power consumption.SOLUTION: The water generator 1 includes an adsorption / desorption unit container 13 that houses the adsorption / desorption unit 11, a compressed air supply section 15 that supplies compressed air to the adsorption / desorption unit container 13, a degassing section 17 that recovers gas in the adsorption / desorption unit container 13, and a water recovery section 19 that recovers water from the gas in the adsorption / desorption unit container 13 recovered by the degassing section 17.SELECTED DRAWING: Figure 1

The utility model belongs to the technical field of water meters, and particularly relates to a volume-variable pressure relief water meter. A water inlet and a water outlet of a meter shell are respectively provided with a switch valve, a pressure relief device penetrates through the lower end of the meter shell and comprises a pressure relief pipe, a containing cavity used for temporarily storing water is formed in the pressure relief pipe, and a movable piston is further arranged on the inner side of the pressure relief pipe and can divide the containing cavity of the pressure relief pipe into an upper cavity and a lower cavity. The upper cavity is communicated with the interior of the watchcase; the moving piston is provided with a moving device capable of driving the moving piston to move up and down, and the up-and-down volume of the containing cavity can be changed through up-and-down movement of the moving piston; the volume of the upper cavity of the pressure relief pipe can be increased through downward movement of the movable piston, so that the volume of a closed space formed by the water meter and the switch valves at the two ends of the water meter is increased, the internal pressure is reduced, the pressure relief function is achieved, the acting force of water pressure on the pipe joint is reduced, the pipe joint is convenient to disassemble, and the working efficiency of water meter replacement is improved.