70results about How to "Avoid water hammer" patented technology

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 a water supply equipment control system. The system comprises a plurality of water pumps, two frequency converters, a control unit, a switching group and a water pressure sensor; the control ends of the two frequency converters are connected to the control unit, and the output ends of the two frequency converters are connected to a node A; the input end of each water pump is connected with the switching group, and the switching group is respectively connected with the control unit and the node A; the control unit controls the operation of the switching group; the switching group controls conduction or cut-off of the input ends of the water pumps and the node A; and the water pressure sensor is connected with the control unit and used for detecting the water outlet pressure of a water using point. The invention also discloses a control method of the water supply equipment control system. The system has the advantages of realizing soft start and soft stop of the water pumps, eliminating the impact current when the water pumps are started, avoiding water hammer effect, stabilizing the water supply pressure, prolonging the service life and the reliability of the equipment and better ensuring the water using safety of a user.

The invention discloses an open hole gravel packing tool for a horizontal well and a use method thereof. An oil layer is packed from top to bottom by adopting the open hole gravel packing tool for the horizontal well. In a packing process, a sand-carrying fluid enters through an oil pipe; specific to the aim of preventing a suction valve from being closed, the sand-carrying fluid is not allowed to flow through the suction valve, can only enter an annulus between an outer pipe column and a service tool through a packing hole of the packing tool of the service tool, and enters an open hole section oil layer through a fluid outlet hole in a packing sliding bush; and sand in the sand-carrying fluid is blocked in the oil layer through a sieve tube, the fluid enters a sand-prevention outer pipe column through the sieve tube, continually flows upwards after entering the service tool from a bottom sealed lower end hole, enters double barrels of the packing tool as well as a packing annular space formed by a central pipe and an outer layer pipe which are communicated with the double barrels, enters annuluses of a casing and the service tool through a return hole in the packing tool, and returns to the ground till packing from top to bottom is completed.

The invention belongs to the technical field of a wind power generator, and specifically relates to an off-course gear and off-course motor protection apparatus and method, and applicable to an off-course system of the wind power generator. A soft starter is connected between four sets of off-course motors and a power supply in series; the soft starter adopts a three-phase anti-parallel thyristor as a voltage regulator; and when the motor is started, the output voltage of the thyristor is increased gradually, and the motor is accelerated gradually until the thyristor is fully switched on, and the motor works on mechanical characteristic of a rated voltage. By virtue of the off-course driving system protection apparatus and method, the problems of increasing of maintenance cost of a wind generator set and influence to the use efficiency of a fan caused by abrasion, teeth collision and the like of an acceleration off-course speed reducer and an off-course bearing gear when static mechanical equipment is suddenly loaded with high moment can be solved; and therefore, smooth starting is realized, the starting current is lowered, and tripping caused by start overcurrent can be avoided.

A liquid nitrogen conveying pipeline capable of preventing water attacks comprises a liquid nitrogen tank self-pressurization and pressure-relief pipeline, a liquid nitrogen conveying pipeline, a liquid nitrogen atomizing device and a gas-liquid separation device, wherein the liquid nitrogen tank self-pressurization and pressure-relief pipeline controls pressure of a liquid nitrogen tank through self-pressurization to provide system back pressure for the liquid nitrogen conveying pipeline; the liquid nitrogen conveying pipeline establishes a passage between the liquid nitrogen tank and the liquid nitrogen atomizing device, and the flow of the pipeline is controlled and adjusted by the aid of stop valves and adjusting valves; the liquid nitrogen atomizing device produces various special atomizing effects; the gas-liquid separation device distinguishes gas and liquid phases in the liquid nitrogen conveying pipeline, and gaseous nitrogen in the pipeline is exhausted, so that single-phase liquid nitrogen is conveyed to the tail-end liquid nitrogen atomizing device. According to the liquid nitrogen conveying pipeline capable of preventing the water attacks, pressure stabilization, flow stabilization and attack prevention functions during separation of the gas and liquid phases are realized, influence of the water attacks and pipeline vibration are eliminated, and hazards to pipeline system safety are avoided.

The invention is a flow measuring and control method for measurable and controllable electromagnetic valves, belonging to the automation technical field. And the invention firstly makes measurable and controllable flow electromagnetic valve, signal processing controller and power switch compose a flow measuring and control system, where the measurable and controllable flow electromagnetic valve transmits pressure difference between upper and lower valve fluids to the pressure input port of a pressure difference sensor so that the fluid pressure difference is converted through the pressure difference sensor into fluid pressure difference electric signal to output to the input end of the signal processing controller, the signal processing controller calculates the current detected flow according to the input fluid pressure difference and the output current of an electrified coil and compares it with the given flow to output control instruction to change the current of the electrified coil so as to control the valve opening and achieve the purpose of flow control. And the invention implements integration of flow measurement and control, and can conveniently control regulating rule of the valve opening by algorithm.

The invention is a steam-curing steam supply system, comprising several still kettles and several steam curing pools, arranging a steam supply main pipe from steam distributing cylinder in boiler room to these still kettles, and then dividing the main pipe into several steam supply branch pipes to their respective still kettles; the main pipe is equipped with a steam supply master valve whose tail end is equipped with a shutoff valve and a drain valve, and a steam backing main pipe between these still kettles and these steam-curing pools and one end of the steam backing main pipe adjacent to the still kettles is divided into several steam backing branch pipes connected with their respective still kettles and the other end is divided into several steam inlet branch pipes to the respective steam-curing pools.

A low-temperature pneumatic valve time delay unit belongs to the technical field of pneumatic control. The time delay unit comprises a gas inlet, a filter, a gas outlet, a valve body, a valve element, an adjusting rod and a pressing cover, wherein the valve body is provided with a flow guide groove and a gas hole. After the low-temperature pneumatic valve time delay unit is arranged in a pneumatic valve starting gas pipeline, gas needs to pass through the gas inlet and the filter to enter the valve element, passes through a throttling opening in the valve element to flow into a gas cavity formed by the valve body, the valve element, the pressing cap and the flow guide groove, and then flows into the gas outlet from one side of the valve body so as to enter a valve pneumatic execution mechanism to drive the valve to be opened and closed. The position of screwing the adjusting rod into the valve element is adjusted so that the gas flow of the gas entering the valve pneumatic execution mechanism can be controlled, and furthermore, the valve obtains different opening and closing delaying time. The low-temperature pneumatic valve time delay unit is compact and reasonable to assembly and is simple and convenient to operate in a use process; the adjustable range is wide and the time delaying function is stable.

The invention discloses a louver window and a container with the same. The louver window comprises a window frame and a plurality of louver blades, the louver blades comprise a blade body, a first shade portion and a second shade portion, the first shade portion extends out from the top end of the blade body, and the second shade portion extends in from the bottom end of the blade body, wherein the louver blades are configured to be arranged in a vertically staggered manner within the window frame along the height of the louver window, and the lower one of upper and lower adjacent louver blades has the first shade portion mating with the second shade portion of the upper one, so that the first shade portion of the lower one is positioned on the inner side of the second shade portion of the upper one. According to the invention, watertight and dustproof effects of the louver window can be improved.

The invention relates to an air preheating device and method of a large negative-pressure heating furnace. The air preheating device comprises a flash tank, a centrifugal pump, a temperature reduction system, preheating device bodies and a water returning system, wherein the flash tank is sequentially connected to the centrifugal pump, the temperature reduction system, flow controllers, the preheating device bodies and the water returning system through a pipeline; saturate condensate liquid is contained inside the flash tank and is conveyed out for being further utilized after sequentially flowing through the centrifugal pump, the temperature reduction system, the preheating device bodies and the water returning system; and the multiple preheating device bodies can be arranged and are connected between the temperature reduction system and the water returning system in parallel through a pipeline. According to the technical scheme, the flow distribution problem of the preheating device bodies is effectively solved, the system operation stability is guaranteed through a temperature reducer, the energy conservation efficiency is improved by reinforcing the heat exchange measures, and the production cost is lowered.

The invention relates to a heat insulation pipe bracket for steam pipeline transportation, in particular to a sliding heat insulation pipe bracket with gradient, and belongs to the technical field of steam pipeline transportation. The bracket comprises two heat insulation pipe brackets and a base, wherein a hoop, a heat insulation tile and a heat insulation felt are arranged in each heat insulation pipe bracket; a rib plate, a support seat bottom plate, a sliding plate and vertical plates are arranged in the base; the two sliding heat insulation pipe brackets are fixed on the support seat bottom plate through the rib plate vertical to a fixing part; the sliding plate is arranged below the support seat bottom plate; the two vertical plates are obliquely connected with the heat insulation pipe brackets and the support seat bottom plate; and the gradient of the vertical plates is adjusted specifically according to the actual using condition. The heat insulation bracket with the gradient has a good heat insulation effect, high compression strength and a reasonable and effective structure and is convenient to produce and easy to massively popularize; and the inherent defect of the original structure is effectively overcome after the heat insulation bracket is actually applied to heat supply network engineering of a mine-mouth power plant in Longyan, Fujian.

The invention relates to the field of rock ecological restoration, in particular to a plant irrigation platform for rock ecological restoration, and can realize plant restoration liquid irrigation on plants. The platform comprises a gas pressurization assembly, a one-way valve assembly, a water tank assembly, a power assembly and a nozzle assembly, wherein under the action of air, plant restoration liquid flows into a liquid cavity through a connecting pipe, liquid diversion is achieved through a liquid diversion boss, the water hammer effect is prevented, the plant restoration liquid obtained after liquid diversion flows out through a spray pipe, the plants are irrigated, and meanwhile, a manual rotating rod and the spray pipe are relatively rotated, so that the area between adjusting plates is changed, and the flow of the plant restoration liquid discharged in unit time is adjusted.

The invention discloses a vibration test device for a composite riser-free drill string coupled with drilling fluid circulation, wherein the vibration test device comprises a drill string model placed in a wave flow combined water tank, load excitation equipment, a drilling fluid circulating device and a data monitoring sensing device, and the load excitation equipment is connected to the top end of a riser-free drill string; the drill string model and the drilling fluid circulating device are connected with a data monitoring sensing device; and the drilling fluid circulating device is connected with the drill string model through a telescopic sleeve, and the drill string model is embedded into a rotating bearing through a universal joint connected with the bottom of the drill string model and connected to a fixing plate at the bottom of a supporting device through a high-strength bolt and a nut. Technical support is provided for drill string optimization, strength check and optimization of operation parameters and drilling parameters of the riser-free drilling technology.

The invention discloses a low-pressure steam condensation water energy saving system and method for an alkane dehydrogenation device. The method comprises the following steps: controlling the flow of desalted water according to the temperature and pressure of low-pressure steam condensation water, and fully mixing the desalted water with the low-pressure steam condensation water in a condensation water attemperator so as to cool to 40 DEG C, wherein the cooled condensation water is used as a water source of an efficient compound air cooler of the alkane dehydrogenation device or enters a low-pressure steam condensation water recovery header pipe and is finally pumped out of the device, thus achieving the effect of energy-saving utilization.

The invention provides a marine nuclear power heat pipe type waste heat removal system stable operation condition analysis method which comprises the steps: 1, determining heat pipe parameters, and establishing a heat pipe model; 2, determining the number and distribution of heat pipes in a heat pipe exchanger; 3, initially setting working conditions of the marine nuclear power heat pipe type waste heat removal system; 4, establishing a mathematical physical model of the marine nuclear power heat pipe type waste heat removal system; 5, calculating the thermal hydraulic characteristics of the system through a Gear algorithm; 6, checking whether the heat pipe has a heat transfer limit or not, wherein the system is unstable if the heat transfer limit occurs; 7, checking the seawater flowing state and the outlet supercooling degree of the marine nuclear power heat pipe type waste heat removal system, and if nucleate boiling occurs or the supercooling degree is smaller than 10 DEG C, indicating that the system is unstable; 8, if any one of the steps 6 and 7 occurs, carrying out the steps 3-7 again, otherwise, outputting a calculation result; 9, changing working conditions, repeating the steps 3-8, and obtaining the working condition range during stable operation; according to the method, suggestions and guidance are provided for safe and stable operation of the marine nuclear power system.

The invention relates to a water-resistant butterfly valve and method for a low-lying position of a large-fall oil conveying pipeline. The butterfly valve is arranged at the low-lying risk pipe section of the pipeline, when the pipeline has dangerous working conditions such as leakage and the like, the butterfly valve plays a role in emergency shutdown of the accident pipe section, and is composedof a handle torque direction changing and dispersing unit, a valve rod gear transmission rate limiting unit and a valve rod torque magnitude control unit, aiming at the water hammer problem caused bythe sudden change of crude oil flow rate and pressure mutation in the pipeline caused by the quick closure of butterfly valve in low-lying position of oil pipelines by operators, the butterfly valveis designed according to the three aspects of the torque reduction of the butterfly valve handle, the limit of the transmission rate of the valve rod and the control of the transmission torque of thevalve rod, so that the force application of the operator to the handle can be reduced in the valve closing process, the rotating speed of the valve rod and the stress of the control valve rod are limited, the applicability of the butterfly valve at the low-lying position of the large-pipe-diameter oil conveying pipeline is improved, so that the valve closing rate is controlled within a reasonablerange to avoid the water hammer phenomenon, and the service life of the butterfly valve is prolonged.

The invention discloses a heating control device and method of a drying box for reconstituting tobacco by a papermaking method. The heating control device includes a heat exchanger, a steam valve, a pressure meter, a hot air drying box, a temperature meter, a steam pipeline and a hot air pipeline. A control system receives detection signals of the on-site pressure meter and the temperature meter,reads the operating speed of a production system at the same time, automatically calculates a steam preset pressure value, and outputs the opening degree of the steam valve after through a PID interlocking control circuit composed of the pressure meter and the steam valve. During the production preheating phase, the situation of mechanical damage of heat exchanging equipment caused by water attackis prevented from occurring by controlling the rising slope of the opening degree of the steam valve; and during the production operating phase, the situation that heat exchanging quality is influenced due to phase state changing of the heat exchanger caused by drastic fluctuation of pressure is prevented from occurring by controlling the rising slope and the falling slope of preset parameters ofthe pressure, the smoothness of control is ensured, and the stability of the quality of heated paper sheets is ensured.

The invention discloses a wear-resistant and high-temperature-resistant butterfly valve made of a full-forged steel material. The butterfly valve comprises a pipeline, wherein a butterfly valve body is arranged inside the pipeline; and a box body is fixedly arranged at the top of the pipeline, a transmission cavity and a working cavity located below the transmission cavity are formed inside the box body, and a first rotating shaft penetrating through the pipeline and the bottom of the working cavity is arranged at the top of the butterfly valve body. The wear-resistant and high-temperature-resistant butterfly valve made of the full-forged steel material has the beneficial effects that the butterfly valve is simple in structure and easy and convenient to operate, the rotating speed of a butterfly valve plate can be automatically adjusted according to the current water pressure in the pipeline when people open the valve, so that the water hammer phenomenon caused by too large instantaneous change of pressure inside the pipeline due to too high opening speed of the butterfly valve plate is avoided, pipeline interior bursting and butterfly valve plate abrasion can be prevented, simplicity and efficiency are achieved, convenience and rapidness are achieved, and the practicability is high.

The invention relates to an intelligent water pump control valve system, which comprises a vortex-free water pump control valve, monitoring terminal equipment, a water outlet pipeline, an intelligentvalve positioner, a centrifugal water pump, a first pipeline pressure sensor, a second pipeline pressure sensor, a shaft sleeve type encoder, a flow sensor and a controller. The vortex-free water pumpcontrol valve is connected with the intelligent valve positioner; the centrifugal water pump comprises a water pump body and a water pump motor; the shaft sleeve type encoder sleeves a main shaft ofthe water pump motor; the vortex-free water pump control valve is connected with the centrifugal water pump through the flow sensor and the water outlet pipeline in sequence; the first pipeline pressure sensor and the second pipeline pressure sensor are installed on the vortex-free water pump control valve; the controller comprises a PLC, a lithium battery, an electric quantity detection module, afrequency converter, a water pump starting button, a water pump stopping button and a wireless communication module, and all electronic components are connected in a matched mode. The problem that the water pump control valve is suddenly opened or closed to generate the water hammer effect is solved.

The invention discloses an automatic exhaust valve of a heating medium oil system. The valve is composed of a lower valve body (1), an upper valve body (2), a valve base (3), a valve cover (4), a flow guide body (5), a filtering net (6), an adjusting polish rod (7), an air floater (8), an adjusting screw rod (9), an air-permeable valve cover (11), a tee joint (12) and a filtering net (13), wherein the valve base, the lower valve body, the upper valve body, the valve cover, the tee joint and the air-permeable valve cover are sequentially in threaded connection, the filtering net (6) is arranged on a cone on the lower portion of an inner cavity of the valve base, the flow guide body is installed in inner holes which are formed in the lower valve body and the upper valve body, two sides of the flow guide body are provided with openings, the air floater is arranged in the upper valve body, the adjusting polish rod is installed in a concave groove in the upper portion of the air floater, the adjusting screw rod is installed in an inner screw hole in the valve cover, and the filtering net (13) is arranged in a groove in the inner wall of the air-permeable valve cover. The exhaust valve can effectively remove free steam generated in an inlet pipe section of a heating medium pump and hydrocarbon vapor in heating medium oil, and guarantees normal operation of the heating medium oil system.

The invention discloses a circulation pump pipeline, which includes a water inlet tee and a water outlet tee installed on the circulation pipeline, and a circulation pump and a bypass pipe are respectively connected between the water inlet tee and the water outlet tee. The connecting pipe between the circulation pump and the water inlet tee is provided with a direct-acting solenoid valve, and the connecting pipe between the direct-acting solenoid valve and the water inlet tee is provided with a pressure relief valve. A one-way valve is arranged on the through pipe. When the circulation pump stops working suddenly, part of the water flows out from the bypass pipe, which alleviates the impact of the water flow on the circulation pump, thereby avoiding the occurrence of water hammer and water hammer, and prolonging the service life of the circulation pump. The invention has a simple structure and Strong reliability.

The invention relates to a water inlet treatment device for a constructed wetland system and a method thereof, and particularly relates to an incoming water pretreatment device for a constructed wetland system and a method thereof. The device comprises a square pipeline, wherein a filling layer is arranged at the bottom of the square pipeline, and is two thirds as high as the square pipe; the filling layer is divided into a physical filter layer and an earthworm filter layer from bottom to top; a round vent is formed right above the square pipeline. According to the method, after the device is applied to a grating and a grit chamber, sands and large particles in sewage are removed, and the sewage enters a sewage delivery pipeline of the device and flows through the earthworm filter layer and the physical filter layer in the delivery process, so that organic matters and solid pollutants in the sewage are further purified.