34 results about "Hydraulic stability" patented technology

The invention relates to a water turbine blade blank profile measuring and machining allowance analyzing method capable of effectively solving the problem of water turbine blade blank profile measurement and machining allowance analysis to ensure the manufacturing quality and precision of the water turbine blades, comprising the following technical solutions: measuring the blade blanks by using a digital close range photogrammetry to obtain the measuring point cloud data shapes of the blank profiles consequently, aligning a measuring coordinate system where the measuring point clouds are located to a design coordinate system where a CAD design model is located, establishing a differential relation of free-form surface parameters with respect to rigid rotation parameters by using an analytic method derived by the multivariate of Newton iteration method to obtain a Jacobian matrix and Hessian matrix which are available for a target equation; then performing the numerical optimization calculation based on the LM method and Newton iteration method, and performing report or graphical output and print on the result. The inventive method is scientific, advanced, stable and reliable, and has high accuracy, thereby ensuring the hydraulic stability, production efficiency and cavitation property, and bringing enormous economic and social benefits.

A concrete revetment block having interlocking arms and sockets and an array of vegetation holes. Two arms and two sockets are formed in the block to provide interlocking capabilities with neighbor blocks of a mat. One arm of the block is constructed with a partial thickness and one socket is constructed with a partial depth, thereby providing vertical interlocking capabilities with the neighbor blocks. An array of holes is formed through the block to allow vegetation to grow therethrough. Various holes are located in the block to allow easy grasping of the block by a workman for lifting the same. The holes are formed in the core square of the block, with respective diameters related to the thickness of the block to maximize the hydraulic stability of the block.

Provide a nuclear reactor power monitoring technology for enhancing the monitoring accuracy and reliability in nuclear thermal hydraulic stability.

A power monitor 30 includes a first calculation unit 42,52 configured to calculate a first stability index based on time series data indicating power oscillation in nuclear instrumentation signals outputted from a plurality of nuclear instrumentation detectors 31; a first determination unit 44,53 configured to compare the first stability index and a first reference value and determine whether nuclear thermal hydraulic stability of the reactor core is stable or deteriorated; a second calculation unit 46,54 configured to calculate a second stability index of the reactor core based on the time series data when the deteriorated state is determined in the first determination unit 44,53; and a second determination unit 47,55 configured to compare the second stability index and a second reference value and determine whether to perform suppressing operation of the power oscillation.

The invention discloses a plate embossing device which comprises an objective table, an embossing bearing beam, an embossing template assembly and template fixing clamps. A main supporting column is installed on the top of a supporting column base. The embossing bearing beam is installed on the top of a bearing block. The embossing template assembly is installed at the bottom of an embossing telescopic inner arm. The left and right sides of the top of the embossing template assembly are provided with the template fixing clamps respectively. According to the plate embossing device, the hydraulic embossing technology is adopted; the embossing device can carry out embossing work more stably due to the hydraulic stability; the hydraulic accuracy is high, and the embossing quality can be ensured; an installed template can be freely replaced according to different needs, and the embossing device applicability is improved; in addition, a pressure detection plate is installed in an inner cavity of the template so that the embossing effect of the embossing device can be monitored at any time, and the problem that the embossing quality is affected when embossing pressure is uneven or insufficient is avoided.

The invention provides a working face hydraulic bracket system machine following speed and hydraulic stability predicting method, and belongs to the field of hydraulic systems. The problem that in theprior art, only the relation between the speeds of different types of actions of a hydraulic bracket, the supply liquid flow and the hydraulic system pressure can be subjected to qualitative description, and a hydraulic bracket action machine following speed and hydraulic stability quantitative predicting method is not provided is solved. The working face hydraulic bracket system machine following speed and hydraulic stability predicting method comprises the steps that supply liquid of the hydraulic bracket is controlled to be a multi-pump variable-frequency emulsified liquid pump station supply liquid system, a control method for action of the supply liquid and action of the hydraulic bracket is preset to be the overlapping-relationship supply liquid and hydraulic bracket concerted action control logic, and on that basis, working state data of the supply liquid system and the hydraulic bracket system are obtained; according to the working state data of the supply liquid system and the hydraulic bracket system, the machine following speed of the hydraulic bracket system is calculated; the pressure change rate of the hydraulic system is calculated according to the working state data of the supply liquid system and the hydraulic bracket system; and the hydraulic stability is evaluated according to the pressure change rate of the hydraulic system.

The invention discloses a highly-stable anticorrosion complete set heat supply system comprising an indirect supply primary system and an indirect supply secondary system. Jet pumps are added to primary side water supply pipes of all heat exchange stations of the indirect supply primary system or are added to primary side water supply pipes of heat exchangers of all compound heat exchange sets in the heat exchange stations; and by employing the jet pumps, a part of primary backwater is absorbed back to the primary water supply pipes, then is mixed with the primary supply water, and finally enters the heat exchangers. An anticorrosion water mixing pipe is added between a boiler outlet main pipe and a primary backwater main pipe. The indirect supply secondary system is connected to the secondary ends of the heat exchangers. The indirect supply secondary system mainly comprises no-power mixing water heat exchange stations established for all heat user buildings, and jet pumps added at heating power entrances of all the heat user buildings; and by employing the jet pumps, a part of secondary backwater is absorbed back to the secondary water supply pipes, then is mixed with the secondary supply water, and finally enters the heat user buildings. The invention also provides a direct supply system. According to the invention, the stability of heat supply network waterpower can be improved, a waterpower unbalance problem is solved, the quality of heat supply is improved, the energy consumption of the heat supply system is reduced, and a boiler can be prevented from low-temperature corrosion.

The invention relates to a self-suction electric control low pressure fuel counter for an internal combustion engine. The self-suction electric control low pressure fuel counter is provided with a counter shell (40), a pressure limiting valve (41), an electric control metering valve (42) and a low pressure fuel conveying pump (44). The electric control metering valve is controlled by an electronic control unit. Fuel sucked by the low pressure fuel conveying pump (44) from an oil tank of the internal combustion engine is controlled by the pressure limiting valve (41) to be supplied to a fuel high pressure generation device of the internal combustion engine through the electric control metering valve (42) in a fixed quantity and time mode. The electric control low pressure fuel counter is an independent device, the pressure limiting valve, the electric control metering valve and the low pressure fuel conveying pump are integrated on the counter shell, the counter can be installed at the corresponding position of the internal combustion engine or installed on a fuel high pressure generation device. According to the electric control low pressure fuel counter, the design of the fuel high pressure generation device is simplified to the maximum extent, and the good hydraulic stability is provided for a fuel injection device of the internal combustion engine.

The invention discloses a guide vane type centrifugal pump waterpower cooperation design method, and the method comprises the steps of determining a geometric parameter of an impeller and a guide vane in the guide vane type centrifugal pump; determining an optimal ratio area parameter combination scheme of the ratio between a guide vane blade channel throat area and an impeller outlet effective over-current area; and establishing a cooperation relation of the geometric parameter between the impeller and the guide vane; determining an optimal equivalent diffusion degree parameter combination scheme of a single guide vane channel based on the optimal ratio area parameter combination scheme; and establishing a cooperation relation of the geometric parameter between the impeller and the guide vane. According to the invention, the ratio area principle is utilized; the coupling relation between the geometric parameter of the pump impeller and the guide vane is discussed; the impeller and the guide vane are cooperated and the parameter is optimized; and the coupling relation between the impeller and the guide vane is improved. In this way, the pump efficiency and waterpower stability can be raised; the optimal equivalent diffusion degree parameter combination scheme can be determined based on the optimal ratio area; and the pump's efficiency and the waterpower's stabilization are further improved.

The invention discloses an equal-travel welded circulating cooling water process pipeline system, comprising a cooling column system and also comprising a circulating water conveying system and an equal-travel process pipeline system; the circulating water conveying system extracts cooling water from the cooling column system, the cooling water runs through the equal-travel process pipeline system and cyclically runs into the cooling column system for cooling. The equal-travel welded circulating cooling water process pipeline system is good in hydraulic stability, the parallel pipelines are equal, resistances are approximately equal, flow distribution is uniform, branches are equal in water pressure drop, water is uniformly distributed among welding devices, less pipe material is consumed, and construction is easy.

The invention discloses a stamping type tube bending machining device which comprises a base, main bending force bearing arms, a bearing cross beam and a bending radian adjusting unit. The main bending force bearing arms are mounted on the left side and the right side of the top of the base respectively. The bearing cross beam is mounted at the top of a bending machine head main bearing column. The bending radian adjusting unit is mounted at the top of the base. The stamping type tube bending machining device is a hydraulic stamping type bending machine, and the quality of the stamping bending machine on tube bending machining can be effectively guaranteed according to hydraulic stability and accuracy. Meanwhile, the bending machine can effectively replace manpower for bending machining, and the efficiency of bending machining is effectively improved. A lateral stamping mechanism and the bending radian adjusting unit are arranged, and therefore the machining efficiency and effect of the bending machine can be effectively guaranteed.

The invention discloses a vane wheel of an extra-low specific speed centrifugal pump with circulating flow channels in each edge of an outlet. The vane wheel comprises a front cover plate, a rear cover plate and a plurality of blades between the front cover plate and the rear cover plate, wherein a narrow main flow channel is formed between every two adjacent blades; the sum of the circumferential width of the outlet of the main flow channel is 10-20% of that of the circumference of the outlet of the vane wheel; a mold line of the front surface and the rear surface of each blade is formed by smooth connection of a plurality of sections of arcs and/or straight lines; the surface of each blade is a ruled surface; a plurality of circulating flow channels are uniformly distributed in the edge of each blade outlet in the circumferential direction; and each circulating flow channel is formed by two holes which are separately formed in the radial direction of the vane wheel and parallel to the direction of a rotating shaft of the vane wheel and are intersected and in communication in space. According to the vane wheel disclosed by the invention, the design of the narrow main flow channels is adopted, so that vane channel vortexes and outlet vortexes of the vane wheel can be removed, and the energy loss is reduced; operation lift and operation hydraulic stability under variable working conditions of the extra-low specific speed centrifugal pump can be improved by the small circulating flow channels at the edge of the outlet; and under the condition that the outer diameter of the vane wheel is unchanged is guaranteed, the lift is increased, and the pressure pulsation amplitude in a spiral casing is reduced.

The invention discloses a heating tail end intelligent on-off adjusting method based on a double-time step, and belongs to the technical field of indoor environment control. The method comprises the following steps that the double-time step is determined, including a first time step and a second time step; a duty cycle prediction model is established based on the first time step, and the opening duty ratio of the valve in the future room temperature control period is predicted; and based on the second time step, the on-off time sequence of each user is optimized. By means of the method, collaborative adjustment of different response frequency variables such as room temperature and flow can be flexibly achieved through the double-time step, so that the multi-element control goal of fast andreliable adjustment of indoor room temperature and hydraulic stability of a heating system is achieved. The defects that in an existing heating system tail end adjusting method, the room temperatureadjustment is easy to lag, the hydraulic instability is unstable and the like are overcome. The method is matched with the control characteristics of a building and the heating system, and simple andfeasible, and facilitates engineering application.

The invention discloses an improved method for enhancing hydraulic stability of a coated fabric, particularly an improved method for enhancing hydraulic stability of a PU (polyurethane) colored film. By using the method, the hydraulic resistance of the coated fabric PU colored film reaches 10000mm H2O or above. The method is mainly implemented by controlling the particle size of the oily color paste in the PU colored film preparation process.

The invention provides an electrically controlled low pressure fuel meter for an internal combustion engine. A pressure limiting valve (41) and an electrically controlled meter valve (42) are at least integrated on an externally hung meter shell (40); the pressure limiting valve (41) is used for limiting pressure of fuel fed into a channel of the electrically controlled meter valve (42) to be below preset pressure; a fuel output hole (25) is formed in the electrically controlled meter valve (42); and the electrically controlled meter valve controls the fuel to be quantitatively supplied to a high pressure fuel generation device of the internal combustion machine from the fuel output hole (25) under real-time modulation of a control unit. The electrically controlled low pressure fuel meter disclosed by the invention accurately and quantitatively supplies low pressure fuel with stable pressure to the high pressure fuel generation device of the internal combustion machine, thus improving the hydraulic stability, simplifying the design of the high pressure fuel generation device and improving the manufacturability and the reliability of the high pressure fuel generation device.

The invention provides a novel air conditioner water transportation and distribution system. The novel air conditioner water transportation and distribution system comprises an air conditioner water supply pipe, an air conditioner water return pipe and N level users. The water inlet end of each level user communicates with the air conditioner water supply pipe through a user water supply pipe of each level. The air conditioner water return pipe communicates with the water outlet end of the Nth-level user, and auxiliary regulating pipes are arranged between the former-level users and the latter-level users, wherein N is greater than or equal to 2. The first-level user is connected in series with the second-level user, and return water of the first-level user and supply water of the air conditioner water supply pipe are mixed into the temperature required by the second-level user. The novel air conditioner water transportation and distribution system can greatly reduce the energy consumption of cold and hot water transportation to improve the hydraulic stability of the system, and can reduce the initial investment and operating cost of the system.

The invention provides hydraulic equipment for earthquake rescue. The hydraulic equipment comprises a base, supporting plate structures, a first pushing structure, a sliding groove structure, a support, fixing blocks, a second pushing structure and an auxiliary supporting structure. The supporting plate structures capable of pushing and supporting boards by rotating by a certain angle are symmetrically arranged on the surface of the tip end of the base. The first pushing structure capable of swinging by a certain angle is arranged on the surface of the inclined face end of the base, the sliding groove structure facilitating sliding is formed on the upper surface of the base, the support is inserted into the sliding groove structure in a sliding mode, the second pushing structure playing a supporting effect is fixedly inserted into the support, and the fixing blocks are symmetrically and fixedly installed on the two sides of the support. Compared with a common jack, the supporting face of the hydraulic equipment is in a supporting plate shape, the area of the supporting face is increased, the overall supporting stability is improved, through cooperation of a corrugated pipe and a rubber sealing ring, the sealing performance of the inside of an oil cavity is guaranteed, and the hydraulic stability of the whole device is improved.

The invention discloses a pneumatic hydraulic pull riveting system. The system comprises a control assembly, a piston assembly, an upper shell, an oil tank, a pull gun piston assembly and a gun barrel; the control assembly is mounted on the upper portion of the piston assembly, a connecting nozzle is mounted on the control assembly, and an upper oil pipe assembly and an oil returning pipe are mounted on the control assembly; the upper oil pipe assembly and the oil returning pipe are inserted into the lower portion of the piston assembly through reserved through holes to be communicated with the oil tank; a handle gasket ring and a handle seat are mounted at the top end of the upper shell, and a handle hexagonal screw is mounted on the handle seat; a handle is welded to the lower portion of the gun barrel, the pull gun piston assembly is mounted in the gun barrel, a switch valve is arranged on the handle, and an oil nozzle and a gas nozzle which are communicated with the gun barrel are mounted at the lower end of the interior of the handle and are connected with the connecting nozzle through a pipeline; and the system is controlled by a gas path to be on and off, an oil path provides power, the size is small, output pressure is large, parts are sealed through a homemade sealing ring, output hydraulic stability is ensured, carrying and maintaining are convenient, and work efficiency is improved.

The invention provides a gas-liquid damping cylinder for vertical jacking. The gas-liquid damping cylinder comprises a central hydraulic cylinder, an outer-layer oil storage sleeve, a pneumatic cylinder cover and a hydraulically-controlled integrated cylinder seat. The hydraulically-controlled integrated cylinder seat is provided with two independent hydraulic channels communicated with a lower cavity of the central hydraulic cylinder and the outer-layer oil storage sleeve. Each of the hydraulic channels is provided with a one-way stop valve used for controlling liquid working media to flow from the lower cavity of the central hydraulic cylinder to the outer-layer oil storage sleeve. One of the hydraulic channels is further provided with a one-way throttle valve used for controlling the flow of the liquid working media from the lower cavity of the central hydraulic cylinder to the outer-layer oil storage sleeve when the one-way stop valve is opened. The gas-liquid damping cylinder has pneumatic convenience and hydraulic stability, operational speed can be adjusted optionally, halfway high-speed and low-speed instant changes can be realized, structure is simplified while the technical requirements such as slow lowering, rapid lowering and quick rising are met, and the gas-liquid damping cylinder has the advantages of pipeline integration, less proneness to oil leakage, small size, smooth movement, simplicity and convenience in operation, and the like.

The invention belongs to the technical field of fuel accessories of aircraft engines, and relates to a hydraulic stability adjusting device composed of a piston damping and a variable throttle nozzle.The hydraulic stability adjusting device comprises a piston shell (1), a spring seat (2), a first damping spring ( 31), a second damping spring (32), a piston (4), a first piston spring seat (51), asecond piston spring seat (52), an adjustable spring seat (7), a support (81), a plug (82), a nozzle (10) and a throttle adjusting nail (11), wherein three pipelines are arranged outside the piston shell (1), the first pipeline is an oil inlet, the second pipeline is connected with an oil outlet of the nozzle (10), and the third pipeline is connected with the oil inlet of the nozzle (10); the piston shell (1) is provided with an oil circuit communicating with the two sides of the piston (4); the throttle adjusting nail (11) is installed in the nozzle (10); and the hydraulic stability adjustingdevice provided by the invention has a small volume, simple structure, high reliability, and can adjust hydraulic stability effectively.

The invention relates to a hydraulic stability improvement based groove type loudspeaker shaped antivibration structure and a method thereof. The hydraulic stability improvement based groove type loudspeaker shaped antivibration structure comprises a water inlet tank and a water pump, wherein a loudspeaker-shaped pipe on the water pump extends into the water inlet tank, and a loudspeaker-shaped opening is formed in one end, arranged in the water inlet tank, of the loudspeaker-shaped pipe; an antivibration device which is loudspeaker-shaped is arranged in the water inlet tank and is positionedunder the loudspeaker opening; the upper half part of the antivibration device is an elliptic curved surface, and a point tangent line of a bus of the elliptic curved surface is vertical to the upperbottom surface of the antivibration device; the lower half part of the antivibration device is a circular arc shaped curved surface, and the curvature of the circular arc shaped curved surface is beyond that of the elliptic curved surface; a bus of the circular arc shaped curved surface is tangent to the a connecting point of the bus of the elliptic curved surface; and a plurality of grooves whichpenetrate the elliptic curved surface and the circular arc shaped curved surface are formed in the sidewall of the antivibration device. With the adoption of the structure, the bottom-attached vortexbelow the loudspeaker-shaped pipe can be obviously removed, and moreover, the water stream can be adjusted to turn, and thus the water inflowing conditions, including good inflowing angle and high flowing speed uniformity, can be achieved.