9 results about "Hydraulic stability" patented technology

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.

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 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 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.