17 results about "Fluid friction" patented technology

The utility model belongs to the technical field of three-way pneumatic ball valves, and particularly relates to a three-way pneumatic ball valve with anti-deflection and anti-static functions, which comprises a shell, a flange pipe is fixedly connected to the outer wall of the top of the shell through bolts, an electric actuator is fixedly connected to the outer wall of the top of the flange pipe through screws, and a valve rod is arranged on the outer wall of the bottom of the valve rod. A valve element is arranged on the outer wall of the bottom of the valve rod. The conducting ring on the valve rod is matched with the grounding wire, static electricity generated by fluid friction can be conducted out to the ground in time, potential safety hazards caused by static electricity accumulation are eliminated, and the using requirements of flammable and explosive working conditions are met; the positioning block in the connecting sleeve is accurately clamped with the positioning groove in the bottom of the shell under the action of the spring, the position of the valve element after rotation can be effectively limited, deflection caused by fluid pressure impact is avoided, it is ensured that a flow channel opening of the valve element is accurately in butt joint with a three-way pipe opening, and the problem that a valve element of a traditional valve is prone to deflection is solved.

The application discloses a dynamic sealing structure and design method of a rotor device, and belongs to the field of rotor devices used for fluid mechanics experiments. The structure comprises a rotor inner cylinder, a rotor outer cylinder and a rotor cover plate with an annular partition. The chamber between the rotor cover plate and the upper edge of the rotor inner cylinder is divided into a first gap and a second gap which are axially adjacent by the partition, and a super-hydrophobic coating is sprayed on the solid wall surface between the two gaps and below the second gap to retain a drag-reducing gas film. The two gaps are respectively filled with sealing oil which has different viscosities, is insoluble in water and has a smaller density than water, forming a layered seal. The application also provides a corresponding design method, which optimizes the sealing structure parameters by establishing an additional torque model and setting the constraints of the rotor speed, the sealing oil viscosity and the sealing oil density. T 0> 50 T 3, can effectively prevent fluid leakage and gas intrusion at high speed rotation, and controls the additional torque introduced by the seal to be below 2% of the main torque, thereby significantly improving the accuracy of high-precision fluid friction torque testing.

The invention discloses a ground source heat pump heat exchanger coupling performance simulation algorithm based on an unsteady-state numerical model, and the algorithm comprises the following steps: S100, designing a triple iteration algorithm, and achieving the simulation of receiving the load of a heat exchanger and calculating the on-way temperature and the pipe wall temperature of a fluid at each time step; step S200, designing a quadruple iterative algorithm to realize simulation of receiving heat pump load, calculating fluid on-way temperature and pipe wall temperature, and calculating backfill and rock-soil temperature; according to the method, the assumption of steady-state heat transfer in the hole is abandoned, and the unstable-state heat transfer models are established in fluid, pipe walls, backfill materials in the hole and rock soil areas outside the hole, so that the method is more in line with physical practical conditions and can accurately accord with measured values even in 30s-level short-time-step simulation.

The application discloses a fracturing construction diagnosis method and device based on pressure-time double logarithm judgment, electronic equipment and medium. The method can comprise: calculating rock mechanics parameters and minimum horizontal principal stress of different depth reservoirs, and obtaining the minimum horizontal principal stress distribution of the formation; calculating the fluid friction pressure of the same well section with the same fluid physical property parameters by the resistance coefficient method based on the power-law fluid; calculating the bottom hole net pressure according to the wellhead pressure, static liquid column pressure, fluid friction pressure, near wellbore friction and minimum horizontal principal stress; establishing a double logarithm sequence according to the bottom hole net pressure, identifying the fracture propagation mode, and evaluating the fracturing construction effect. The application can improve the accurate evaluation ability of the fracturing effect on site, and realize dynamic optimization and adjustment of the construction process.

This invention relates to a method for calculating oil friction loss in the rotor of a high-speed oil-filled motor, belonging to the field of motors. The method involves: establishing a finite element simulation model coupling the electromagnetic and temperature fields of the motor; using this model to obtain a multivariate functional relationship with the motor's optimizeable parameter [E] as the independent variable and the motor's operating temperature T as the dependent variable; establishing a composite functional relationship between fluid viscosity and the motor's optimizeable parameter [E]; based on the analysis mechanism of fluid-rotor friction loss, obtaining the functional relationship between Reynolds number Re and fluid viscosity, and the functional relationship between Reynolds number Re and the motor's optimizeable parameter [E]; combining the analytical expression of Reynolds number Re to obtain an analytical calculation model for fluid friction loss; setting an axial flow velocity in the simulation model, comparing it with the analytical calculation results, and introducing a correction coefficient to obtain an analytical calculation model for oil friction loss considering axial flow; and using the multivariate function extremum theory to obtain the relationship between oil friction loss and the motor's optimizeable parameter [E]. This invention is used for calculating oil friction loss in the rotor of a high-speed oil-filled motor.

The invention relates to the technical field of oil and gas exploitation, and discloses a thickened carbon dioxide fluid flow friction resistance testing system and method. The method comprises the following steps: S1, liquefying carbon dioxide gas into liquid carbon dioxide; s2, preparing the liquid carbon dioxide, a cosolvent and a thickening agent into a thickened carbon dioxide fluid, and recording the density as shown in the specification; s3, the thickened carbon dioxide fluid is introduced into the testing pipeline, the flow speed of the thickened carbon dioxide fluid introduced into the testing pipeline is as follows, and the pressure difference of the thickened carbon dioxide fluid flowing through the inlet end and the outlet end of the testing pipeline is recorded; s4, calculating the friction resistance coefficient according to a formula (1), wherein D is the diameter of the test pipeline; l is the length of the test pipeline; s1 and S2 are the solubility of the cosolvent and the thickening agent in the liquid carbon dioxide. The invention creatively provides a friction coefficient calculation formula, and the numerical relationship between the friction of the thickened carbon dioxide fluid in the shaft and each parameter can be quickly calculated and evaluated according to the formula.

The utility model discloses an energy dissipation device of effective control sludge pipeline slurry flow velocity, including high manganese steel reducing pipe, reinforcing rib, flange, rubber pad and high -strength bolt. High manganese steel reducing pipe is fixed with flange welding, and the inner wall is equipped with wear -resistant weld layer, is used for increasing fluid friction through partial reducing diameter, reduces slurry flow velocity, and reinforcing rib is used for enhancing the connection intensity, and rubber pad improves the leakproofness, and high -strength bolt is used for realizing fastening connection. The device simple structure, wear resistance is strong, convenient installation can effectively reduce the slurry flow velocity in pipeline, alleviate diesel engine overload risk, prolong the life of pipeline, improve the security and stability of dredging and filling construction.

The invention discloses a dynamic sealing structure of a rotor device and a design method, and belongs to the field of rotor devices for fluid mechanics experiments. The structure comprises a rotor inner cylinder, a rotor outer cylinder and a rotor cover plate with an annular partition plate. A cavity between the rotor cover plate and the upper edge of the rotor inner cylinder is divided into a first gap and a second gap which are adjacent in the axial direction through the partition plate, and super-hydrophobic coatings are sprayed on the surface of the fixed wall between the two gaps and below the second gap so as to retain the anti-drag gas film. The two gaps are filled with sealing oil which is different in viscosity, immiscible with water and smaller than water in density, and layered sealing is formed. The invention further provides a corresponding design method, and collaborative optimization is carried out on parameters of the sealing structure by establishing an additional torque model and setting a constraint condition that T0 is larger than 50T3. The structure can effectively prevent fluid leakage and gas invasion under high-speed rotation, meanwhile, the additional torque introduced by sealing is controlled to be below 2% of the main torque, and the accuracy of a high-precision fluid friction torque test is remarkably improved.

Method for controlling the operation of a plain bearing, comprising the steps: a) Determining the temperature dependence of the dynamic viscosity of the lubricant in the plain bearing; b) Determining the transition temperature of the sliding bearing from semi-fluid friction to fluid friction; c) Determining the temperature dependence of the bearing characteristic λ(T) and the value of the bearing characteristic λ kr of the sliding bearing transition from semi-liquid to liquid friction based on the temperature dependence of the dynamic viscosity of the lubricant; d) Measuring the operating temperature of the plain bearing; e) Adjusting the operating temperature of the plain bearing to determine the bearing characteristic λ Rab near λ kr to be kept in a range that forms a transition between semi-fluid friction and fluid friction.

The invention discloses a coreless axial flux motor with air gaps filled with ferrofluid and a design method thereof, the coreless axial flux motor with the air gaps filled with the ferrofluid comprises a stator with a stator winding and a rotor with permanent magnets, the air gaps are formed between the stator and the rotor, and the air gaps are filled with the ferrofluid; the design method comprises the steps of generating a current motor design scheme according to structure parameters of the coreless axial flux motor; establishing a motor model of the coreless axial flux motor according to the current motor design scheme, and calculating the power required by ferrofluid friction loss to be overcome by rotor rotation; and if the power does not meet the preset constraint condition, adjusting the structural parameters of the coreless axial flux motor, and repeating the steps until an optimal current motor design scheme is obtained. The invention aims to solve the problem of low air gap magnetic flux density of a traditional coreless axial magnetic flux motor and improve the heat dissipation performance of the coreless axial magnetic flux motor.

This invention discloses a high-temperature resistant, corrosion-resistant, and drag-reducing coating for the inner wall of long-distance heating pipelines, its preparation method, and its application, belonging to the field of pipeline functional coating technology. The coating comprises a main agent A and an amine curing agent B. Main agent A uses modified epoxy resin and modified fluoropolymer as film-forming substances, combined with fillers such as talc and zinc phosphate, and specific functional additives, and is prepared through premixing, dispersion, shearing, and grinding. When sprayed onto the inner wall of long-distance heating pipelines, this coating forms a coating with a water contact angle of 113°, a surface roughness ≤2.27μm, a glass transition temperature Tg >130℃, and shows no significant corrosion after being boiled in 95℃ water for 900 days. Simultaneously, it reduces fluid friction resistance by 38.7% and transportation energy consumption by approximately 39%, effectively solving the problems of poor pipeline temperature resistance, high corrosion risk, and high resistance, extending pipeline life, and possessing both safety and energy-saving value.

Devices and methods for cleaning and / or drying endoscopic instruments, such as endoscopes, are provided. A drying device for use with an endoscopic instrument comprises an elongate member configured for advancement through an internal lumen within the endoscopic instrument and a drying member removably coupled to a portion of the elongate member. The drying element comprises a variable pressure region shaped and configured to increase the hydrodynamic fluid friction force and fluid pressure force applied to the wall of the internal lumen of the endoscope to more effectively remove all of the moisture and fluid from the internal surfaces of an endoscopic instrument.

A method for determining fluid friction pressure loss in a well pumping fluid includes measuring fluid pressure in the well while pumping at a first flow rate. The first flow rate is changed to a second flow rate and the fluid pressure is measured for a selected time. A modeled pressure response of the well is performed using selected values of parameters related to pipe friction factor. The modeled pressure response is compared to the measured pressure. The values of the parameters related to pipe friction factor are adjusted and the modeling and comparison are repeated until the modeled pressure response substantially matches the measured pressure. The first flow rate is changed and the measuring, modeling, comparing, adjusting the parameters related to pipe friction factor, and repeating the modeling and comparison are repeated to determine a relationship between the values of the parameters related to pipe friction factor and the first flow rate.

The utility model discloses a petroleum industry gate valve with a built-in cooling channel, which relates to the field of petroleum industry gate valves and is characterized by comprising a valve body, a valve rod arranged in the middle of the valve body and a valve plate arranged at the bottom of the valve rod. The water inlet pipe and the water outlet pipe are arranged on the two sides of the outer side wall of the valve body and connected with a pipeline on an external circulating cooling pipeline through the water inlet pipe and the water outlet pipe, so that a circulating cooling channel is formed, and the effect is that heat generated by high-pressure fluid friction, chemical corrosion or environmental radiation of the valve body is continuously taken away; the temperature of the valve body material is always lower than a critical value, and thermal deformation of a sealing surface, valve plate blocking and thermal expansion failure of the valve rod are effectively prevented.

This utility model belongs to the field of bridge seismic isolation and damping technology, specifically relating to a railway self-resetting bridge pier with an additional energy dissipation device at the pier base. The pier includes a column, an enlarged foundation, and a pile foundation cap. The column and the enlarged foundation are bonded together. A separation surface is provided between the enlarged foundation and the pile foundation cap. It also includes a liquid viscous damper, externally positioned between the enlarged foundation and the pile foundation cap. In this utility model, installing a viscous damper energy dissipation device between the enlarged foundation and the pile foundation cap increases the pier's energy dissipation capacity, limits lift-off displacement, reduces pier top displacement, and improves the pier's performance. During the swing lift-off process, the liquid viscous damper dissipates energy through fluid friction in reciprocating tension. This reduces the damage to the main body of the bridge pier caused by seismic forces, maximizing the safety of the bridge structure. The viscous damper energy dissipation device is simple and convenient to replace when damaged.

The utility model relates to the technical field of roller shutter door track, and disclose a track of mute roller shutter door piece, the utility model discloses a scheme, including track, the inboard of track is installed with mute adhesive tape, the left side of track and mute adhesive tape evenly penetrates and is opened with the spigot, install the oil injection pipe in the spigot, the utility model discloses through moving the sealing gasket to the oil injection pipe separation with the oil injection pipe of moving the knob to the up, can inject the lubricating grease into the oil injection pipe, through the oil injection pipe of uniform distribution, to realize accurate target injection, avoid the lubricating grease waste that the large area greasing caused, through the oil injection pipe can inject the lubricating grease to the contact surface of mute adhesive tape and roller shutter door piece, to this will the dry friction between both be converted into the fluid friction inside lubricating grease, significantly reduce the friction sound of door piece when lifting, and through the oil injection pipe can increase the contact area between track and mute adhesive tape, thereby improve the installation stability of mute adhesive tape in the track.

Devices and methods for cleaning and / or drying endoscopic instruments, such as endoscopes, are provided. A drying device for use with an endoscopic instrument comprises an elongate member configured for advancement through an internal lumen within the endoscopic instrument and a drying member removably coupled to a portion of the elongate member. The drying element comprises a variable pressure region shaped and configured to increase the hydrodynamic fluid friction force and fluid pressure force applied to the wall of the internal lumen of the endoscope to more effectively remove all of the moisture and fluid from the internal surfaces of an endoscopic instrument.