16 results about "Hydraulic stability" patented technology

The utility model discloses a clutch booster with a hydraulic damping valve, which comprises a clutch booster assembly, the clutch booster assembly comprises a hydraulic cylinder, and the hydraulic cylinder is connected with the hydraulic damping valve which is used for damping hydraulic pressure sudden change or pressure wave crest in the hydraulic cylinder. The hydraulic cylinder is connected with the hydraulic damping valve, hydraulic oil pressure generated in sudden change or pressure wave crests, especially instantly generated by the sudden change or pressure wave crests, is transmitted to the hydraulic damping valve, sudden change pressure change in the hydraulic cavity is balanced through the hydraulic damping valve, and pressure generated after sudden change or wave crests is reduced and directly transmitted to the clutch. The hydraulic pressure in the hydraulic cylinder is stably output, the influence of sudden pressure change (especially increase) and overlarge pressure wave crest generated in the hydraulic cavity on product control hydraulic stability is avoided, and then the influence of unstable product output pressure is avoided.

The utility model discloses a hydraulic capacity increasing device for prolonging pressure maintaining duration, which comprises a hydraulic capacity increasing cylinder assembly, an oil conveying joint assembly and an oil discharge adjusting assembly, an oil discharge adjusting assembly is arranged at the upper end of the hydraulic capacity increasing cylinder assembly; an oil conveying joint assembly is arranged at the lower end of the hydraulic capacity increasing cylinder assembly; the hydraulic capacity increasing cylinder assembly comprises a cylinder body; a spring moving cavity is formed in the cylinder body; hydraulic oil compensation cavities are formed in the lower ends of the spring moving cavities; and a pressurizing spring is arranged in the spring moving cavity. Hydraulic oil stored in the hydraulic oil compensation cavity is squeezed into a decompression hydraulic system through resilience force of the pressurizing spring for hydraulic oil supplementation, the decompression speed of hydraulic power output equipment is effectively relieved, follow-up first-aid repair is facilitated, hydraulic stability of the system is kept, and safety of the hydraulic system is improved.

A vertical centrifugal pump having improved hydraulic stability in a hump region, comprising a volute casing (4) and a centrifugal impeller (2), wherein the centrifugal impeller (2) is located in the volute casing (4); hydrofoil-profile radial guide vanes (3) are provided between an outlet of the centrifugal impeller (2) and an inlet of the volute casing (4), the number of the vanes being coprime to the number of blades of the centrifugal impeller (2); the chord lengths, the cross-sectional areas and the maximum thicknesses of the plurality of radial guide vanes (3) each gradually increase along the increase of the cross-sectional area of the volute casing (4); the radial guide vane (3) having the minimum chord length, the minimum cross-sectional area, and the minimum maximum thickness is located at a position corresponding to the minimum cross-sectional area of the volute casing (4); the plurality of radial guide vanes (3) have the same inlet diameter and the same inlet installation angle. In this way, the hump characteristics of the pump at low flow rates can be suppressed, and the magnitudes and fluctuations of the axial and radial forces on the impeller and the guide vanes in the hump region can be reduced, thereby comprehensively improving the hydraulic stability of the vertical centrifugal pump having the guide vanes in the hump region in many aspects.

The application discloses a large-scale tubular pump water pressure oscillation amplitude prediction method based on a virtual target point matrix, and belongs to the technical field of large-scale low-lift water transfer projects. The method is as follows: the related characteristic parameters of a large-scale tubular pump device are determined, and the characteristic time sequence coordinates of a guide vane inlet section observed from the guide vane inlet direction are defined; the virtual time sequence target point matrix, the virtual wheel disc target point matrix and the radial extension function are calculated based on the characteristic parameters and the characteristic coordinates of the concerned points; and the water pressure oscillation amplitude of the guide vane inlet is calculated based on the obtained radial extension function. For a given large-scale tubular pump device, the water pressure oscillation amplitude at any concerned position of the guide vane inlet section can be quickly and accurately estimated by the application, which is simple, efficient and solves the problem that the existing method cannot accurately predict the water pressure oscillation amplitude of a large-scale tubular pump device under large-scale and multi-time sequence conditions, thereby providing reliable technical support for the quantitative evaluation of the hydraulic stability of the large-scale tubular pump device.

The present invention provides a vertical centrifugal pump for improving the hydraulic stability of a hump region, comprising a spiral volute and a centrifugal impeller. The centrifugal impeller is located within the spiral volute. Hydrofoil-shaped radial guide vanes having a blade number that is a prime number to the blade number of the centrifugal impeller are provided between the centrifugal impeller outlet and the spiral volute inlet. The chord length, cross-sectional area, and maximum thickness of several of the radial guide vanes increase as the cross-sectional area of ​​the spiral volute increases. A radial guide vane having a minimum chord length, cross-sectional area, and maximum thickness is located at the point where the cross-sectional area of ​​the spiral volute is the smallest. The inlet diameters and inlet placement angles of the several radial guide vanes are consistent. The present invention not only suppresses the hump characteristic of the pump at low flow rates, but also reduces the magnitude and fluctuation of the axial and radial forces acting on the impeller and guide vanes in the hump region, thereby comprehensively improving the hydraulic stability of a vertical centrifugal pump with guide vanes in the hump region from multiple aspects.

The invention provides a mixer intelligent speed regulation method and system based on hydraulic stability and a medium, and relates to the technical field of hydraulic stability control. The method comprises the steps that fluid at an inlet of a mixer is monitored in real time, a real-time fluid parameter set is obtained, the real-time rotating speed of the mixer is introduced to conduct load calculation on the mixer, and real-time load torque parameters are determined; setting a target mixing quality index to determine target mixing efficiency, performing speed regulation calculation according to the real-time load torque parameter in combination with the target mixing efficiency, generating a speed regulation control signal, obtaining a speed regulation control result, reversely performing rotation speed verification on the real-time fluid parameter set, and formulating a dynamic speed regulation instruction to perform self-adaptive speed regulation on the mixer. The technical problem that in the prior art, the rotating speed of a mixer cannot be dynamically adjusted according to the real-time characteristics of fluid, and consequently the product mixing quality is unstable is solved. The technical effects that the rotating speed of the mixer is accurately and adaptively regulated and controlled, the product mixing quality and the production efficiency are improved, and meanwhile hydraulic stability is ensured are achieved.

The invention belongs to the technical field of fluid machinery and hydroelectric generation, and particularly relates to a draft tube using a hyperbolic central tube as a vortex suppression device. The draft tube using the hyperbolic central tube as the vortex suppression device comprises the hyperbolic central tube, a support, a straight cone barrel, an elbow tube and a diffusion tube. The inner curved surface of the hyperbolic central pipe meets the equation # imgabs0 #, and the hyperbolic central pipe and the straight cone barrel are coaxially arranged, and the hyperbolic central pipe is fixed in the straight cone barrel through a support. The device is suitable for the central spiral vortex strip working condition of the draft tube, after water flow flows out of the rotating wheel and enters the straight cone barrel, the formed central vortex strip is damaged due to impact on the inner wall of the hyperbolic central tube, the speed circulation is reduced, and the negative pressure at the center is reduced due to water flow rotation, so that the strength of the vortex strip is reduced, and the pressure pulsation amplitude is weakened; and the central vortex strip is separated from a mainstream area outside the hyperbolic central pipe, so that the hydraulic stability of the hydroelectric generating set under the working condition of the central spiral vortex strip of the draft tube is enhanced.

A vertical centrifugal pump having improved hydraulic stability in a hump region, comprising a volute casing (4) and a centrifugal impeller (2), wherein the centrifugal impeller (2) is located in the volute casing (4); hydrofoil-profile radial guide vanes (3) are provided between an outlet of the centrifugal impeller (2) and an inlet of the volute casing (4), the number of the vanes being coprime to the number of blades of the centrifugal impeller (2); the chord lengths, the cross-sectional areas and the maximum thicknesses of the plurality of radial guide vanes (3) each gradually increase along the increase of the cross-sectional area of the volute casing (4); the radial guide vane (3) having the minimum chord length, the minimum cross-sectional area, and the minimum maximum thickness is located at a position corresponding to the minimum cross-sectional area of the volute casing (4); the plurality of radial guide vanes (3) have the same inlet diameter and the same inlet installation angle. In this way, the hump characteristics of the pump at low flow rates can be suppressed, and the magnitudes and fluctuations of the axial and radial forces on the impeller and the guide vanes in the hump region can be reduced, thereby comprehensively improving the hydraulic stability of the vertical centrifugal pump having the guide vanes in the hump region in many aspects.

The utility model discloses a spiral wear ring sealing structure of a lead-bismuth pump, which belongs to the technical field of fluid mechanical equipment and comprises a rotating impeller, and a hollow annular sealing structure is arranged between the outer edge of the rotating impeller and the inner wall of a pump casing to form a wear ring gap. Helical teeth are arranged on the outer wall face of the sealing structure, the tooth profile of the helical teeth forms a helical channel, the helical channel spirally ascends in the axial direction, the direction of the helical channel is opposite to the rotating direction of the impeller, and the three-dimensional distortion of the helical teeth has an inclination angle alpha in the radial direction. Due to the fact that the rotating direction of the spiral groove channel is opposite to that of the impeller, leakage flow has the tendency of being pushed reversely, leakage of gap fluid is hindered, hydraulic loss is reduced, efficiency is improved, certain reverse axial force can be possibly generated, axial force generated by other components is helped to be balanced, and the hydraulic stability of a pump set is improved.

The present application belongs to the field of fluid machinery and hydroelectric power technology, and particularly relates to a draft tube with a hyperbolic center pipe as a vortex suppression device. The draft tube with a hyperbolic center pipe as a vortex suppression device comprises a hyperbolic center pipe, a support, a straight conical barrel, an elbow pipe and a diffusion pipe. The inner curved surface of the hyperbolic center pipe satisfies the equation and the hyperbolic center pipe is coaxially arranged with the straight conical barrel and fixed in the straight conical barrel through the support. The present application is suitable for the condition of a central spiral vortex band of the draft tube. When water flows out of the runner and enters the straight conical barrel, the central vortex band formed is destroyed due to the impact on the inner wall of the hyperbolic center pipe, the velocity circulation is reduced, the negative pressure at the center caused by the rotation of the water flow is reduced, thereby reducing the strength of the vortex band, weakening the pressure pulsation amplitude, separating the central vortex band from the main flow area outside the hyperbolic center pipe, and enhancing the hydraulic stability of the hydroelectric generating set under the condition of the central spiral vortex band of the draft tube.

The present invention provides an injection molding machine hydraulic stability system, which includes an electro-hydraulic proportional pressure control valve, a pressure control check valve, an oil inlet port and a control oil circuit; the oil inlet port includes an oil inlet P port; the input end of the electro-hydraulic proportional pressure control valve is connected to the output end of the pressure control check valve and the oil inlet P port, and the input end of the pressure control check valve is connected to the output end of the electro-hydraulic proportional pressure control valve; the output end of the electro-hydraulic proportional pressure control valve is connected to the control oil circuit; the mold opening and closing control oil circuit includes a second three-position four-way directional control valve, a first balance valve and a pilot-operated check valve; the guiding boost control oil circuit includes a third three-position four-way directional control valve, a first check valve and an electronic ball valve. With the structure of the present invention, the problem of large instantaneous impact on the pipeline caused by excessive pressure in the injection molding machine hydraulic system can be solved; by increasing the back pressure and enhancing the clamping force, the problem of unstable mold closing is solved.

The application provides a mixer intelligent speed regulation method and system based on hydraulic stability, and a medium, and relates to the technical field of hydraulic stability control.The method comprises the following steps: real-time monitoring of fluid at the inlet of a mixer, obtaining a real-time fluid parameter set, introducing real-time rotating speed of the mixer to perform load calculation on the mixer, determining a real-time load torque parameter, setting a target mixing quality index to determine a target mixing efficiency, performing speed regulation calculation according to the real-time load torque parameter in combination with the target mixing efficiency, generating a speed regulation control signal, obtaining a speed regulation control result, performing rotating speed verification on the real-time fluid parameter set in the reverse direction, and formulating a dynamic speed regulation instruction to perform adaptive speed regulation on the mixer.The technical problem that the prior art cannot dynamically adjust the rotating speed of the mixer according to real-time characteristics of fluid, resulting in unstable product mixing quality, is solved.The technical effect of accurate adaptive regulation and control of the rotating speed of the mixer, improvement of product mixing quality and production efficiency, and guarantee of hydraulic stability is achieved.

This utility model discloses a corrosion-resistant impeller for stainless steel water pumps, including a gland, a wheel seat, and several blades. The blades are evenly distributed along the circumference of the wheel seat. The gland is located at both ends of the wheel seat, and a pressure ring is movably fitted around the outer circumference of the gland. Several screws are provided on the surface of the pressure ring. The blade ends are provided with threaded sleeves that mate with the screws. The opposing surfaces of the wheel seat and the gland have engagement grooves for inserting the blades. The gland, wheel seat, and blades are all made of stainless steel and undergo anti-corrosion treatment. A swing gap is provided between the engagement groove and the blades. A positioning structure is provided on the blade surface, and an elastic buffer washer is provided between the pressure ring and the screws. This structure enables the blades to be disassembled, replaced, and swing slightly, improving the impeller's adaptability and hydraulic stability in corrosive environments, and providing excellent corrosion resistance and ease of maintenance.

The hydraulic damping valve comprises a shell, a damping cavity is formed in the shell, a damping piston, an auxiliary block and an elastic piece are arranged in the damping cavity, and the auxiliary block and the elastic piece are matched with the damping piston. The hydraulic damping valve is connected to the hydraulic energy supply structure and communicated with the hydraulic energy supply structure, hydraulic pressure generated by sudden change or pressure wave crests, especially instantly generated by the sudden change or pressure wave crests and the hydraulic damping valve is transmitted to the hydraulic damping valve, and sudden change pressure change in the hydraulic energy supply structure is balanced through the hydraulic damping valve; the pressure of the sudden change or the wave crest is reduced and directly transmitted to the target structure, so that the hydraulic pressure in the hydraulic energy supply structure is stably output, the influence of the sudden change (especially the increase) of the pressure generated in the hydraulic energy supply structure and the overlarge pressure wave crest on the product control hydraulic stability is avoided, and the influence of the unstable output pressure of the product is further avoided.

The application discloses a hydraulic control system for stable operation of an ocean temperature difference energy power generation full working condition, and belongs to the technical field of ocean temperature difference energy power generation. The hydraulic control system comprises a temperature difference energy power generation assembly and an intelligent hydraulic stability control assembly. The intelligent hydraulic stability control assembly comprises a monitoring unit, a hydraulic valve, an electric control valve and an intelligent valve control unit. The monitoring unit is used for monitoring multiple types of information data, feeding back a circulating operation working condition of a turbine device, and transmitting the monitored information data to the intelligent valve control unit. The real-time circulating operation working condition of the turbine device is compared with an optimal operation working condition to determine the opening and closing states of the electric control valve. The electric control valve is electrically connected with the intelligent valve control unit to control the opening and closing and the opening degree of the electric control valve, so as to control the flow size of each branch of the system. The electric control valve comprises an electric valve and a pneumatic tee electric ball valve. The electric control valve is connected with a hydraulic cylinder to control the flow size of the hydraulic cylinder, so that the pressure of the whole system is kept stable.

The invention discloses an anti-explosion induction motor control method, device and system for liquid supply of an emulsion pump station. The method carries out vector control on the motor according to a given rotating speed and a feedback rotating speed. Firstly, the given rotating speed is determined through a hydraulic stability control algorithm, and hysteresis control is conducted through the algorithm according to the real-time hydraulic pressure supply intensity and the unloading valve emulsion flow; secondly, the feedback rotating speed is obtained through an improved high-performance rotating speed estimation algorithm, a discrete model is constructed through a second-order Runge-Kutta method in the algorithm, a particle swarm algorithm is constructed to optimize PI parameters in the rotating speed self-adaption law, the previous historical optimization algorithm process is considered in the improved particle swarm algorithm, and a sliding window method and an exponential decay weighting method are introduced; according to the method, the precision, the dynamic performance and the parameter adaptive capacity of the rotating speed identification algorithm are improved, and the intelligence, the energy-saving performance and the reliability of the liquid supply system of the emulsion pump station are improved.