1375 results about "Water hammer" patented technology

A fluid control valve having a spring biased shuttle plunger member which opens or closes fluid flow through a plurality of radially spaced apart fluid passageways disposed between an upstream chamber and downstream chamber in the valve body responsive to a fluid pressure greater than the spring force and any differential pressure between the upstream and downstream chambers to prevent fluid from being supplied at a pressure higher than a desired operating pressure and prevent high dynamic differential pressures, such as a “water hammer” or explosive pressure. Alternatively, in a normally closed embodiment, pilot fluid at a pressure greater than the spring force and any differential pressure in the upstream chamber is utilized to open the valve, which is then closed by the spring force.

The invention relates to the new features for the earlier applications of toilet system attached a multi-purpose hand held water sprayer affording personal and environmental hygiene. The sprayer that delivers tempered water includes the lock elements on the components to secure connection, various types of spray tip cap for the use of general and medical purposes, an injection apparatus to supply external fluid, a fortified flexible hose, a water hammer arrester or air chamber to reduce water pressure shock, a water heater, a valve to control water flow, a mixing valve, check valves for the mixing valve to stop in reverse flow, a water pressure regulator with a pressure meter, a return line with a check valve for guarding against hot water spike, a thermometer at the outlet, a holder for placement of the sprayer, and various types of valves and sources for the hot and cold water supply. The new features also include the fortified flexible hose having the rollup attachment of middle layers over the flange for reinforcement.

The invention belongs to the technical field of water treatment, relates to a water flow buffer and pure water back-wash technology, and particularly relates to an air bag used for water treatment and a water purification device with the air bag. According to the air bag used for water treatment, and the water purification device with the air bag, the air bag is formed by a high-resistance plastic film and is used for caching water flow and buffering pressure in a water treatment device. With the adoption of the water purification device with the air bag, the air bag is arranged in a filter shell space which is communicated with a filter core pure water port; pure water is cached by the compression of the air bag and discharged by expansion of the air bag, so that the purpose of the invention of back-flowing pure water and back-washing the filter core is achieved. With the adoption of the water purification device with the air bag, the air bag is arranged in the filter shell space which is communicated with a pressure switch in a reverse osmosis water purification device, the problems of frequency opening of the water inlet valve and the frequency starting of a booster pump are solved by caching the pure water and the pressure by the air bag. According to the water purification device with the air bag, the air bag is arranged in a water inlet pipeline of the filter core, so that the purpose of the invention of clearing up water hammer and buffering water inlet pressure is achieved.

The invention discloses a down-hole hydraulic power pulse staged fracturing permeability-increasing device and method. The device comprises a down-hole pulse fracturing device, a controllable hydraulic packer, a continuous oil pipe, a fluid control valve and a fracturing truck. The fracturing truck is connected with the controllable hydraulic packer and the down-hole pulse fracturing device through the continuous oil pipe. The controllable hydraulic packer is connected to the back end of the down-hole pulse fracturing device. The fluid control valve is arranged at the connecting opening of the continuous oil pipe. The down-hole pulse fracturing device comprises a first cylinder body, a second cylinder body, a mandrel, a sliding sleeve, a sealing ring, a spring, a nozzle and the like. Under the condition that certain construction parameters such as pumping pressure and displacement are provided for the ground fracturing truck, large-displacement low-frequency pulse fluid is generated at the shaft bottom and is injected in, and a water hammer effect is formed. The down-hole hydraulic power pulse staged fracturing permeability-increasing device is simple in structure, durable and easy to adjust, low-frequency large-displacement pulse energy can be generated, the construction technology is simple, pulse energy can be well used for breaking rocks, net-shaped complex cracks with wide extending ranges are generated, and reservoir stratum permeability is effectively improved.

The invention discloses a water turbine parameter identification method based on self-adaptive chaotic and differential evolution particle swarm optimization. The water turbine parameter identification method is characterized by comprising the following steps of firstly, determining a nonlinear mode of a water turbine; secondly, acquiring frequency step test data; thirdly, determining a fitness function of the self-adaptive chaotic and differential evolution particle swarm optimization; fourthly, setting a basic parameter of an identification algorithm; fifthly, calculating a fitness function value of particles and an individual extreme value of the particles in a swarm as well as a global extreme value of the swarm and updating the speed and the position of the particles; sixthly, carrying out premature judgment, if the premature is judged, carrying out differential mutation, transposition, selection and other operations to avoid local optimization; seventhly, checking whether the algorithm meets end conditions or not, if so, outputting an optimal solution, and otherwise, self-adaptively changing an inertia factor and executing the fifth step to the seventh step again. According to the water turbine parameter identification method disclosed by the invention, a water hammer time constant of the water turbine is identified, and the algorithm is high in convergence speed and convergence precision; in addition, test data of the water turbine at any load level can be utilized, so that the test cost is effectively reduced.

A water hammer arrester constructed with a cylindrical housing having a closed upper end and an internal pressure chamber. A piston slidably installed within the housing to receive a reaction force medium such as gaseous nitrogen, provides a space that communicates with an integral pressure chamber within the closed upper end of the housing. A threaded connector bearing a nipple circumscribed with a plurality of circumferential grooves is crimped into the neck of the lower end of the housing.

The invention discloses a liquid column separation-bridged water hammer simulation method based on three-dimensional CFD (Computational Fluid Dynamics). The liquid column separation-bridged water hammer simulation method comprises the following steps: by carrying out three-dimensional modeling and mesh generation, firstly, carrying out single-phase compressible stable-state calculation of a water body to obtain a stable-state fluid field; then carrying out liquid column separation gas-liquid two-phase transient flowing calculation; and finally, processing a computed result by using post-processing software. According to the liquid column separation-bridged water hammer simulation method, on the basis of simultaneously considering the compressibility of the water body and steam, the mass transfer between gas and liquid is considered, and liquid column separation types do not need to be distinguished, so that a mathematical model and a solving method thereof are simplified to a certain extent and the simulation accuracy is relatively high; and unreal pressure pulse similar with one-dimensional simulation is not formed, and visualization of primary formation, development and collapsing processes of a hollow hole in a liquid column separation process is realized.

A method for simulating water-hammer waves in a borehole is used to estimate formation parameters such as porosity and permeability, and to design completion strings. The simulation method uses a model that has a plurality of layers, at least one of the layers includes radial layering.

The present invention relates to a valve combined with a water hammer arrester, including the water hammer arrester having a cylindrical casing having one side closed and the other side open, a shock-absorbing material being put into the cylindrical casing, and a piston adapted to be inserted into the cylindrical casing, the piston having packing members mounted thereon to prevent the leakage of the shock-absorbing material, wherein a drive part of the valve has an insertion portion formed by reducing the lower portion of the water hammer arrester, so that the insertion portion of the water hammer arrester functions as a spindle of the valve and a body of the water hammer arrester functions as an operating handle of the valve.

A valve is formed to resist snap-action closure forces and provides a smooth closing action to minimize or eliminate water hammer. The valve is opened and closed by modulating the relative air pressures above and below a piston in the valve. Because the air pressures above and below the piston produce partially offsetting forces on the piston, the net closure force on the valve plunger is limited, and the rate of valve closure is reduced enough to achieve the effect of minimizing water hammer. A separate vent port volume may vent to atmosphere to further limit valve closure speed, and to further reduce water hammer. The valve can provide the capability to control the flow of fluids over a wide temperature range over a long service life while reducing or eliminating water hammer. The valve is well suited for use in injection mold temperature control systems.

Grip and guiding device for directional drilling, in order to drill straight or curved holes with a predetermined path. The device includes a drill string (11-21) comprising parts which rotate during drilling, including a drill bit (11) or a water hammer on its front end and a non-rotating packer unit (14) with a packer tubing (28) comprising one or several projecting pressure pads (25,31-32) arranged behind the drill bit (11) or the water hammer. The pressure pad or pads are arranged to be pressed out towards the drill hole wall by means of the pressure from a drill fluid when this exceeds a certain level. The pressure pad (25) or the pressure pads (25A-25C) may be arranged asymmetrically and / or affects the packer tubing (28) asymmetrically, e.g. by having different heights. The pressure pad(s) force guiding ribs on the opposite side into the hole wall in order to prevent rotation of the packer unit (14). The pressure pad or pressure pads can on deactivation be withdrawn for performing linear drilling.

An impeller type water-hammer proof and silent check valve includes a shell (2), a sealing ring (3), a cowl (4), a flow guide body (5) and a spring (7). Turbulent-flow blades (1) are provided on the outer surface of the flow guide body (5). Two groups of axial-flow blades are arranged in the flow passage, and the blades are fixed on the streamline outer surface of the flow guide body (5). The valve continuously converts pressure energy and kinetic energy to a torque surrounding an axial direction to the flow guide body (5) during a process of backflow liquid flowing through the turbulent-flow blades (1). The valve forms a pair of torques counteracting each other as the turbulent-flow directions of the two groups of blades are opposite. The liquid pressure energy and kinetic energy are continuously and gradually converted to the torque to the flow guide body (5) in the turbulent-flow blades (1), so that an abrupt impact to the valve by the water hammer is eliminated.

A filter for use with overhead sprinkler irrigation systems is disclosed. The filter includes a body, a removable screen, and a manually-actuated plunger adjacent the screen. A water hammer table is partitioned in the body and located above the plunger. The plunger is positioned for reciprocal movement through a debris outlet between an open, debris-discharging position, and a closed filtering position. The plunger defaults to the closed filtering position by pressurized water flowing through the body. The water is simultaneously filtered through the screen and passes out a clean water outlet while debris accumulates within the body. The plunger may be manually retracted to the open, debris-discharging position at any time, whereby accumulated debris is flushed out of the body through the debris outlet by residual water flowing therethrough.

The invention discloses a LeakView leakage control and management system for an urban water supply pipe network. The control and management system comprises a partitioned management system, a leakage noise online monitoring system and a water hammer early warning and monitoring system, the partitioned management system makes the water supply pipe network to form a partitioned management mode from the factory-leaving water yield, first-level partition, second-level partition, DMA to user terminal multi-level water units, all the water units are scientifically managed through a water balance test, a pressure control strategy with the optimal water saving effect and the optimal economic matching performance is made through a response mechanism of the leakage of the water supply pipe network to the pressure, leakage noise is monitored on line by using terminal noise monitoring equipment instead of leakage detection by manual listening, the noise is displayed in the form of data, a region where the leakage is suspected to exist is found through comparative analysis of the key data, the water hammer early warning and monitoring system adopts a transient flow pressure fluctuation situation of a network system to be combined with a big data technology, and therefore the rapid change of the pressure of the pipe network system can be monitored on line, an alarm for the abnormal pressure change situation can be given in real time, on-line early warning can be realized, the data can be deeply excavated and analyzed, and water hammer protection can be made.

Methods for manufacturing a water hammer arrester having an endurance against pressure of a fluid as well as excellent productivity. There is provided Methods for manufacturing a water hammer arrester comprising steps of: deforming plastically an end of a work piece for a housing to close it by pressing the end toward a center thereof while the work piece is rotated at high speed, the work piece is a brass pipe having predetermined length; forming a housing by cutting a closed part in prescribed thickness; filling up a gas and inserting a piston within the housing to prevent the gas from leaking; forming a connecting part having smaller diameter than the housing by pressing an outside of an open end of the housing provided with poured gas and the piston; and mounting a connector to the connecting part.

An underground drilling method and apparatus generates intense pressure pulses at a location at the surface. The pressure pulses propagate down through a drill string to a drill bit. The pulses may be generated by creating water hammer in flowing drilling mud. Intensity of the acoustic pulses is increased in the bit nozzles. Vigorous pulsing of the fluid exiting the bit nozzles results in better cleaning of the hole bottom and faster drilling. The pulses may be used to drive the operation of various down hole tools. One type of tool has multiple pistons arranged in series. High pressure pulses move the pistons to generate strong mechanical vibration in the drill string. Vibration of the drill string may also reduce the friction between the drill string and the hole, resulting in lower torque requirements.

A valve-venting method increases the durability of flow restrictors within gas venting valves used on large diameter water and sewer pipelines such that transient high pressure conditions that can cause rapid adiabatic heating of the discharging gases are prevented from causing flow erosion and debris wear induced by the high velocities and thermal softening of the valve components. The method utilizes wear resistant orifice inserts that are more conductive than the valve component to better distribute the heat, and dynamic surge control geometry to slow the heat flow and provide progressive water-hammering control during high pressure events.

The invention discloses a valve closing optimal control method of a transition process of a long distance and mass flow water conveyance system, and relates to the field of pressure pipeline hydraulics simulations. The method comprises the steps that a long distance and mass flow water conveyance engineering hydraulic transition process simulation model is established; on the basis of the pumping station water hammer two stage valve closing, a trial algorithm is adopted to seek feasible region intervals on a first segment valve closing from the closing times and angular variations; according to the obtained feasible region interval, an optimization interval search method is adopted in the feasible region interval to conduct the step-by-step search, an optimal feasible region floating within the design range is obtained, the calculation is terminated, and the optimization control on the valve closing of the transition process of the long distance and mass flow water conveyance system is completed. According to the valve closing optimal control method, the optimal feasible region of the valve closing is achieved, both the pump station unit and the safe operations of the pipeline are satisfied, meanwhile the occurrence of the cutoff and the bridge water hammer is reduced or prevented.

Disclosed is a method for weakening a coal seam hard roof based on an electric pulse technology. A discharging electrode instantaneously discharges in water in cracked drill holes to generate rapid and powerful shock waves, so that the water around the discharging electrode generates a water hammer and a water wedge effect to impact roof rock, a roof is repeatedly impacted through repeated discharging to generate accumulated damage, the coal seam roof is weakened accordingly, effective collapse of the roof is achieved, and the problem can be effectively solved that the periodic weighing step pitch is increased due to the large area of the roof reserved in a goaf. By means of the method for weakening the coal seam hard roof based on the electric pulse technology, electric energy of high-voltage electric pulses is converted into the shock waves to break the rock stratum, and the method has the advantages of simple operation, high-efficiency cleaning, low cost and wide application range.

The invention discloses a rope coring positioning suspension mechanism with an in-place notifying function. The rope coring positioning suspension mechanism comprises an inner pipe assembly and an outer pipe drilling tool. The inner pipe assembly is arranged in the outer pipe drilling tool and can work when a rope drilling tool is released, an annular washing liquid channel between the inner pipe assembly and the outer pipe drilling tool is cut off after the rope drilling tool is released in place, water hammer pressures can be generated, a movable valve block can be driven to open a washing liquid channel at a valve block plate, and operators can know that the rope drilling tool is released in place by the aid of pressure fluctuation of an earth surface pressure gauge; a locking device is unlocked when the rope drilling tool is about to be fished, a fisher can drive a rope fishing spear to move upwardly, the movable valve block moves to the uppermost end of the rope coring positioning suspension mechanism, the washing liquid channel at the valve block can be opened, the fisher can continue being pulled, and accordingly the rope drilling tool can be completely fished. The rope coring positioning suspension mechanism has the advantages that an in-place notifying device can be automatically reset, accordingly, the rope coring positioning suspension mechanism is low in pressure loss, a locking function can be realized after the rope drilling tool is positioned, the rope drilling tool can be shortened, the rope coring positioning suspension mechanism is favorable for improving the rock core acquisition quality, field application and operation can be facilitated, and problems of suction, absorption and the like when drilling tools are fished can be solved.

A pressure balancing cartridge for mixing hot and cold water includes a casing having a sleeve therein which further includes a reciprocating balancing spool therein. There are seal members positioned to form a seal between the sleeve and the casing. Further, a spring is incorporated to protect a balancing spool of the valve from “water hammer” shock and to mechanically shear and digest any deposited matter in the area of the spring. Still further, by using material other than stainless steel, failure of the balancing spool is eliminated in “bad” water environments.Finally, the seal members comprise stainless steel clips or inserts. To address issues of mechanical wear, all improvements defined above increase useful longevity of the cartridge.

The invention provides an air intake and release valve which prevents burglary and can effectively eliminate water hammer produced when air is discharged by a water supply pipeline. The air intake and release valve comprises a mass air intake and release valve, a water hammer prevention device and a trace air intake and release valve. The trace air intake and release valve is connected with a shell of the mass air intake and release valve; the water hammer prevention device is connected with the shell of the mass air intake and release valve; and the water hammer prevention device and the trace air intake and release valve are arranged in a protective cover of the circumstance of the shell of the mass air intake and release valve. The air intake and release valve has the advantages that: the air intake and release valve with the structure can limit the air release speed when the pipeline is filled with water and releases air quickly, so that an air bag is formed in the pipeline to buffer the compact of water on the pipeline; and external parts of a valve body are effectively prevented from being stolen because the external parts are embedded in the valve body and an attachment bolt is plugged; and an air layer is reserved above a main floating ball to prevent a sealing surface from being contacted with water, eliminate the phenomenon that water is leaked due to impurity blockage, and can effectively guarantee that the sealing surface is prevented from being frozen at an extremely low temperature, the main floating ball can leave the sealing surface and vacuum is not produced in the pipeline.

The invention discloses an electro-hydraulic driving system for a sluice valve and the sluice valve. The electro-hydraulic driving system for the sluice valve comprises a motor, a hydraulic pump, an integrated control valve, an oil cylinder, an energy accumulator, a hydraulic oil tank and a monitoring and control system. The integrated control valve comprises an overflow valve, a check valve, a quick connector, a two-position three-way electromagnetic ball valve, a throttle valve, a pressure sensor, a two-position four-way electromagnetic reversing valve and hydraulic control check valves. The electro-hydraulic driving system for the sluice valve and the sluice valve are mainly characterized in that an energy accumulator emergency function is achieved, and it is ensured that the work of the electro-hydraulic driving system is not influenced by liquid charging of the energy accumulator through the design of an oil circuit; meanwhile, the cushioned oil cylinder is applied so that a rear segment slow closing function of emergency valve closing can be achieved, and a water hammer phenomenon is effectively avoided. Meanwhile, a pressure measurement function is achieved so that on-line fault diagnosis and overload protection can be provided according to a pressure measurement result and an operation.

A water-bath steam heating gasification furnace is characterized in that a floating pipe plate heat exchanger is arranged in a cylinder; a steam inlet pipe is arranged at the top of the floating pipe plate heat exchanger; a low-temperature water inlet pipe is arranged at the lower part of the floating pipe plate heat exchanger; the water entering the floating pipe plate heat exchanger from the low-temperature water inlet pipe takes the shell of the floating pipe plate heat exchanger as a runner and is introduced into the cylinder from the upper clearance of the floating pipe plate heat exchanger; the cylinder is internally provided with an enwound-pipe-type heat exchanger; and the bottom and the top of the enwound-pipe-type heat exchanger are provided with a low-temperature liquid inlet pipe box and a gas outlet pipe box respectively. The gasification furnace can effectively avoid the phenomena of water hammer and vibration when running at the variable working conditions.

The present invention relates to a water hammer recognizing and energy saving water hammer prevention system and a method for controlling the same that is configured wherein in case of the selective on / off operations of a plurality of pumps in a pipe system in accordance with the change of the use environment, the pressure variation and level variation of an air chamber caused by water hammer are compared with reference values and set values, and they are divided into a normal mode and a safe mode, thereby controlling the air intake and exhaust of the air chamber and preventing energy consumption from unnecessarily occurring.