26results about How to "Reduce pressure pulsation" patented technology

The invention discloses a bag filter for tail gas of a rotary kiln, the bag filter comprises a cylinder, a filter bag and a conical hopper, the bottom of the conical hopper is connected with a gas inlet and dust discharge assembly, the gas inlet and dust discharge assembly comprises a header pipe communicated with the conical hopper, the header pipe extends into a kiln cover, and one end of the header pipe positioned in the kiln cover is communicated with a diversion branch pipe; rectifying plates are obliquely arranged at the connecting parts of the header pipe and the diversion branch pipes. According to the bag type filter, the air inlet dust discharging assembly is arranged between the conical hopper and the kiln cover, the filter is directly communicated with the kiln cover under the combined action of the main pipe, the rectifying plate and the flow guide branch pipe, the distance between the bag type filter and a rotary kiln can be avoided, part of components in tail gas can be prevented from being condensed into liquid, and blockage of an inlet pipeline and a filter bag is avoided; the negative pressure occurs in the inlet pipeline and the filter, and the filter cleans dust to cause the abnormal phenomenon that the pressure pulsation amplitude in the kiln cover is large, so that the output rate, safety and reliability of equipment can be improved, and the life cycle cost of the equipment is reduced.

The invention relates to the technical field of plunger pumps, in particular to a plunger assembly and a plunger pump. The plunger assembly comprises a cylinder body unit, a plunger unit and a sliding shoe unit. The plunger unit is inserted into the cylinder body unit in a sliding manner; a plunger cavity is formed between one end, far away from a plunger ball head, of a plunger rod of the plunger unit and the cylinder body unit; a weight reduction cavity in the plunger rod penetrates to the end, away from the plunger ball head, of the plunger rod. A partition part in the weight reduction cavity divides the weight reduction cavity into a buffer containing cavity and a communicating cavity; the communicating cavity is communicated with the plunger cavity; an oil through hole in the plunger ball head is communicated with the communicating cavity; a first damping hole formed in the end, close to the plunger cavity, of the separation part communicates with the buffering containing cavity and the plunger cavity. A second damping hole in the end, close to the plunger ball head, of the separation part communicates with the buffering containing cavity and the oil passing hole. The sliding shoe unit is in ball hinge with the plunger ball head; one end of the oil through hole penetrates to the surface, attached to the sliding shoe unit, of the plunger ball head. In this way, the problem of how to relieve pressure pulsation of the plunger assembly is solved.

The utility model relates to the technical field of energy storage, in particular to a flexible water pumping and compressed air energy storage device which comprises a water storage pond, a reversible pump turbine, a water-gas co-containing cabin and a compressor. The water storage tank is connected with one end of the reversible pump turbine through a first pipeline, and the other end of the reversible pump turbine is connected with the water-gas co-containing cabin through a second pipeline; the compressor is connected with the water-gas co-containing cabin through a third pipeline; a power generator-motor is arranged on the reversible water pump water wheel, a full-power converter is arranged on the power generator-motor, and the full-power converter is used for being connected with a power grid. The full-power converter is adopted as a connecting device between the generator motor and the power grid, all energy in the charging and discharging process passes through the full-power converter, and the whole capacity of the whole energy storage device is controllable; and the full-power converter serves as high-capacity power electronic equipment, is high in control precision and rapid in adjustment, can provide enough support for the high-proportion distributed wind / light micro-grid, and guarantees stable and safe operation of the power grid.

The invention discloses a multistage energy storage wave energy hydraulic energy conversion system and a control method thereof, and belongs to the technical field of ocean hydraulic power generation, the system comprises an overhanging frame, a hydraulic cylinder is arranged on the side, away from a shore-based platform, of the overhanging frame, a floater is arranged below the hydraulic cylinder, and a hydraulic PTO system is arranged in the overhanging frame; the hydraulic PTO system comprises an oil tank, a one-way valve set, an energy accumulator set and a generator set, the hydraulic cylinder is connected with the oil tank through the one-way valve set, and the energy accumulator set and the generator set are both connected with the oil tank in series. By adopting the multistage energy storage wave energy hydraulic energy conversion system, the energy accumulators with different volumes are combined with the mechanical energy storage flywheel, so that the pressure pulsation of hydraulic oil in the system is reduced as much as possible, the hydraulic energy conversion efficiency of a wave energy power generation device is improved, more electric energy can be output, the wave energy is subjected to graded energy storage and multistage smooth liquid flow, and the power generation efficiency is improved. The safety and sustainability of the power generation system are improved, and the working efficiency of the hydraulic wave energy conversion system can be improved.

The utility model relates to the field of pumps, in particular to an anti-cavitation device which comprises an outer ring and an inner ring which are coaxially arranged, a backflow channel allowing media to flow back is formed between the outer ring and the inner ring, and the tail end of the outer ring is bent inwards in the radial direction to form an inverted-hook-shaped guide ring in the backflow direction of the backflow channel. The bending direction of the guide ring is opposite to the backflow direction of a medium in the backflow channel, and a gap exists between the tip end of the guide ring and the tail end of the inner ring so that the medium in the backflow channel can be discharged. According to the centrifugal pump, the cavitation phenomenon of the centrifugal pump is greatly reduced, and the stability of the centrifugal pump during operation is improved. The utility model further provides the centrifugal pump.

This invention relates to the field of pump engineering technology, and provides a method for designing the trailing edge of an impeller blade, an impeller blade, and a guide vane volute mixed-flow pump. The method includes obtaining a reference wrap angle of the impeller blade; determining multiple spanwise positions along the spanwise direction of the outlet trailing edge; determining a target wrap angle corresponding to each spanwise position based on a wrap angle calculation model, the reference wrap angle, and each spanwise position; and determining the profile of the outlet trailing edge based on each target wrap angle, resulting in a non-straight trailing edge that varies along the spanwise direction. By creating a non-straight trailing edge that varies along the spanwise direction, the impeller outlet trailing edge has different wrap angle distributions at different spanwise positions, thereby adjusting the jet wake structure distributed along the spanwise direction at the impeller outlet and reducing pressure pulsation in the bladeless region.

The present invention provides a vortex belt control device for a tailwater pipe of a turbine, comprising a support rod that can be freely slidably installed in the tailwater pipe of the turbine in a vertical direction, a plurality of fan blades hinged on the support rod in an annular distribution, and an opening and closing mechanism for driving the fan blades to rotate around their respective hinge points to achieve an umbrella-like opening and closing to adjust the opening and closing angles of the fan blades. The opening and closing angles of the fan blades are adjusted by the opening and closing mechanism so that the fan blades pass through the shear layer area. When the shear layer encounters the fan blades, the fan blades can block the relative movement of the fluid at the interface, thereby blocking the fluid vortex filaments from converging into spiral vortex belts. The present invention adjusts the angle of the fan blades by regulating the up and down movement of the slider, and adjusts the height position of the fan blades by driving the support rod to move up and down through a power mechanism. The fan blades can be adjusted to the optimal use angle and height according to the actual working conditions of the turbine, thereby destroying the shear layer to the greatest extent and achieving the best vortex belt control effect.

The invention discloses a low-pulsation low-noise axial plunger pump device which comprises a shell, an oil distribution cover, a main shaft arranged in the middle in the shell, a plurality of plungers distributed in a back-to-back staggered mode along the circumference of the main shaft, an oil distribution disc located in the shell and arranged at the end of the main shaft, a floating cylinder base located on the rear side of the oil distribution disc, a floating cylinder and a limiting sleeve. A pressing plate is arranged between the floating cylinder and the plunger; and a driving pin is arranged between the floating cylinder seat and the main shaft. The number of the plungers is 2-3 times that of a conventional pump, the plungers are back to back and staggered, hydraulic pressure internal force borne by the main shaft can be counteracted, work and operation are stable, the generated pulsation double amplitude is very low, and compared with a traditional plunger pump, the pump is few in leakage point and high in volume efficiency; high-quality flow can be output, and noise is low. The invention has the advantages of simple structure, small occupied space, light weight, lower pressure pulsation and low noise.

The invention provides a compressor blade, an impeller and a high-temperature and high-pressure steam compressor, the compressor blade comprises a body, the body is provided with a working face and a non-working face which are oppositely arranged, and the body is provided with a buffer part in the direction, facing the non-working face, of the outlet tail edge of the working face; therefore, secondary flow loss and separation loss at an outlet of the tail edge of the body are reduced. The invention further provides a compressor impeller which comprises the compressor blade. According to the compressor blade, the buffer part is arranged at the outlet tail edge of the working surface of the body in the direction towards the non-working surface, so that the normal momentum between the working surface and the non-working surface is reduced, the secondary flow loss and separation loss at the outlet position of an impeller are reduced, and the working efficiency of the impeller is improved; and meanwhile, the wake loss of the trailing edge of the blade can be reduced, dynamic and static interference between the impeller and a static part behind the impeller is reduced, and airflow pressure pulsation is reduced.

The present application belongs to the field of fluid machinery, and discloses a centrifugal pump volute with a composite noise reduction structure, which comprises a volute body with a base circle radius R, a volute chamber is formed inside the volute body, and a plurality of micro guide vanes are distributed in the circumferential direction on the inner side of the inlet of the volute body; two semicircular grooves are arranged on the upstream segment of the volute chamber inner wall baffle in front and back symmetry along the spiral line; two guide plates are arranged at the baffle of the volute body, the guide plate close to the inlet side of the volute body is a front guide plate, and a plurality of guide holes are formed on the front guide plate; a plurality of cavities are uniformly arrayed on the wall surface of the baffle of the volute body; and the bending directions of the micro guide vanes and the guide plates are consistent with the water flow direction. The present application optimizes the inlet flow through the micro guide vanes, suppresses vortex through the semicircular grooves, and cooperatively reduces the pressure pulsation through the guide plate and the cavity structure, so that the fluid noise is effectively reduced while the hydraulic performance is maintained, and the comprehensive performance is obviously improved.

According to the draft tube flow guide structure for the water turbine, a triangular flow guide grid is arranged at an inlet of a draft tube, a circular flow guide grid is further arranged in the triangular flow guide grid, and a plurality of flow guide plates are further evenly arranged on the inner wall of the rear half section of a straight cone section of the draft tube in the circumferential direction. According to the draft tube flow guide structure for the water turbine, the problem that in the prior art, the efficiency of a water turbine set is reduced due to increased pressure oscillation and draft tube loss caused by a vortex band is solved.

The utility model discloses an electronic expansion valve and refrigeration equipment, and relates to the technical field of electronic expansion valves. The electronic expansion valve comprises a valve body, a valve needle and a first connecting pipe, the valve body is provided with a valve cavity and a valve port communicated with the valve cavity, and the valve port is formed in the axial end of the valve body; the valve needle is arranged in the valve cavity and used for axially stretching into or moving away from the valve port. The first connecting pipe is arranged on the side wall of the valve body and provided with a first outlet communicating with the valve cavity. On the projection of the radial section of the valve body, the central axis of the first outlet is located on one side of the valve port, so that fluid in the first connecting pipe can flow into the valve port in the valve cavity in a rotational flow mode after flowing out of the first outlet. According to the technical scheme, the turbulence phenomenon of fluid can be improved, pressure pulsation in the valve port can be reduced, and then noise can be reduced.

The present application provides a rotor housing structure, including: a housing end wall, a heat dissipation structure is arranged on the housing end wall, the heat dissipation structure is formed by a plurality of sheet-shaped air guide plates arranged circumferentially around a rotating shaft, and a vent is formed between two adjacent air guide plates. According to the rotor housing structure of the present application, not only can the pressure pulsation generated during the rotation of the rotor be effectively reduced, the air noise can be reduced, and the heat dissipation of the motor can be accelerated.

The present invention discloses a high-precision fuel flow stabilization regulation system, including a fuel supply system, a fuel return system and a main oil circuit flow regulation system; the fuel supply system includes a fuel storage tank, a fuel pump and a pressure-stabilizing tank connected in sequence; the fuel return system includes a first back pressure valve, the inlet of the first back pressure valve is connected to the inlet of the pressure-stabilizing tank, and the outlet of the back pressure valve is connected to the fuel storage tank; the main oil circuit flow regulation system includes a flow meter, an electric regulating valve and a pressure transmitter connected in sequence, and the inlet of the flow meter is connected to the outlet of the pressure-stabilizing tank. The present invention can realize multi-level fuel flow regulation with different precisions, improve the fuel flow regulation precision, reduce pressure pulsation, ensure the fuel supply precision and stability in the combustion test, and improve the reliability of the combustion test results.

The utility model relates to the technical field of fans, in particular to a fan blade, an axial flow fan and an air conditioner. The fan blade has a first direction, a second direction and a third direction which are intersected pairwise, and the fan blade comprises a pressure surface, a suction surface, a blade main body and a plurality of sawteeth; the face, in the third direction, of the fan blade is a suction face, and the other face, in the third direction, of the fan blade is a pressure face. The sawteeth are arranged in the first direction, and the ends, in the positive direction of the second direction, of the sawteeth are connected with the ends, in the negative direction of the second direction, of the blade body. A noise reduction channel is formed in the position, close to the sawteeth, of the blade body, one end of the noise reduction channel is located on the pressure face, and the other end of the noise reduction channel is located on the suction face. The noise reduction channel can enlarge and disperse the pressure concentration area and reduce the pressure pulsation of the pressure concentration area, so that the noise problem caused by the pressure pulsation is reduced.

The invention discloses a pressure pulsation attenuator of a high-pressure low-flow hydraulic system. The pressure pulsation attenuator comprises a top cover structure, a piston structure, an end cover and a three-way connector body. The top cover structure is fixedly installed at one end of the end cover, the other end of the end cover is in threaded connection with one end of the three-way connector body, the piston structure is arranged in a cavity formed between the end cover and the three-way connector body, and the other two ends of the three-way connector body are in threaded connection with the high-pressure oil inlet pipe and the high-pressure oil outlet pipe respectively. The pressure pulsation attenuator is compact in structure, small in size, modularized, convenient to install, very suitable for being applied to a high-pressure and low-flow small hydraulic system, convenient to install and detach, convenient to maintain and replace the belleville spring and the sealing assembly, capable of adjusting the arrangement mode and model of the belleville spring according to hydraulic systems with different working pressures and flows, and capable of improving the working efficiency. Therefore, the pressure pulsation attenuation effect is improved.

The utility model discloses a water pump and have its heat management system, vehicle, water pump includes: the casing of first recessed cavity is defined, the pump shell of second recessed cavity is defined, and first recessed cavity and second recessed cavity constitute the pump cavity with liquid outlet, and the communicating place of first recessed cavity and liquid outlet is equipped with first separate tongue, and the communicating place of second recessed cavity and liquid outlet is equipped with second separate tongue, on the circumference of pump cavity, the connecting end of first separate tongue is connected with casing and the end face of free end is first tongue face, and the connecting end of second separate tongue is connected with pump shell and the end face of free end is second tongue face, in the direction of axially away from second tongue face, first tongue face is inclined in the direction of connecting end to free end along the circumference, and / or, in the direction of axially away from first tongue face, second tongue face is inclined in the direction of connecting end to free end along the circumference. Water pump according to the utility model embodiment has the advantages of reducing the pressure pulsation produced when the water is thrown from the impeller assembly, reducing the vibration and noise of water pump operation etc.

A fuel cell system is disclosed. The fuel cell system comprises: a fuel cell module including a plurality of unit cells for generating electrical energy by using oxygen of air and hydrogen of a reformed fuel gas; a first module including a burner part which burns an unreacted fuel gas and air discharged from the fuel cell module, an air-heating part which heats air through heat exchange with a hot combustion gas and a flame generated by the burner part and supplies the heated air to the fuel cell module, and a water vapor generation part which converts water, flowing through an inner portion thereof, into water vapor through heat exchange with a hot combustion gas generated by the burner part; and a second module which mixes a fuel supplied from an external fuel supply source and water vapor supplied from an water-vapor generator part, allows a water vapor reformation reaction to occur, and supplies a reformed fuel gas to the fuel cell module.

The invention discloses a circular tube type diffuser and a design method, relates to the technical field of engine research, and aims to solve the problem that the safety performance of a turbine pump is reduced due to a diffuser in the prior art. The circular tube type diffuser comprises a ring inner cylindrical surface, a ring outer cylindrical surface and a plurality of target channels which are evenly distributed in the circumferential direction and extend from the ring inner cylindrical surface to the ring outer cylindrical surface in the radial direction. The cross section of each target channel is a circle, the center line of each target channel is a straight line, the target surfaces of the target channels are tangentially connected with the ring inner cylindrical surface, and the opposite surfaces of the target surfaces are tangentially connected with the ring outer cylindrical surface; an inlet transition section, a throat section and an expansion section are sequentially arranged in the multiple target channels in the direction from the ring inner cylindrical surface to the ring outer cylindrical surface. The expansion section is a beveled arc expansion section or a beveled spiral line expansion section; the expansion section is used for reducing liquid flow loss of an outlet of the diffusion channel and pressure pulsation of an inlet of the diffuser and an outlet of the turbine pump; therefore, the vibration level of the turbine pump is reduced, and the safety is improved.

This invention discloses a tip vortex control device for a pump-jet propulsion rotor based on a blade tip wing. Under the premise that the open-water performance of the pump-jet propulsion meets the requirements for rapid response, a tip wing is added to the pressure surface side at the tip of the rotor blade. The starting point of the tip wing at its leading edge root is positioned backward relative to the leading edge of the rotor blade tip, and the trailing edge root is positioned forward relative to the trailing edge of the rotor blade tip. The leading edge of the tip wing is backward-sloping and its profile forms an angle with the rotor blade rib line, while the trailing edge is forward-sloping and its profile forms an angle with the rotor blade rib line. The airflow-facing surface of the lower end face of the tip wing's leading edge is of the NACA airfoil type, and the upper end face of the tip wing maintains the same profile and clearance height as the inner wall of the duct. This invention, without increasing the structural complexity, design burden, or weight of the pump-jet propulsion, can effectively control the generation and development of tip vortices and effectively suppress pressure pulsations and unsteady flow excitation caused by tip vortices, facilitating engineering applications.

The invention discloses a high-integration light hydraulic power source, which adopts an airborne hydraulic power scheme of'double-channel motor-fixed displacement pump + energy accumulator ', and adopts a permanent magnet synchronous motor to drive the fixed displacement pump to realize oil supply and oil return. After the servo driver receives a starting instruction of the control system, the two-channel motor is driven to rotate, the hydraulic pump is driven to rotate at a high speed and output flow while the motor rotates, the energy accumulator is pressurized, and a high-pressure oil source is provided for the 12-way hydraulic actuator joint. When the driver receives a hydraulic power source turn-off instruction sent by the controller, the driver controls the two-channel motor to descend and stop rotating according to a fixed rotating speed signal, and the servo controller collects oil pressure and temperature information in the power source to participate in closed-loop control. The device has the advantages of being high in integration degree, small in size and light in weight.

To address the limitations of existing pulse detonation combustors using detonation jet ignition, which require long jet tubes and thus restrict the increase of their operating frequency, and the dependence of stable operation of pulse detonation turbine engines on the performance and reliability of the igniter, this invention proposes a pulse detonation combustor based on rotating detonation wave ignition. This invention utilizes the relatively high frequency of rotating detonation combustion and the requirement for only a single ignition. The rotating detonation wave generated by the rotating detonation chamber serves as a continuous high-energy ignition source, igniting the explosive mixture within the detonation jet channel. This creates a high-energy detonation jet at the channel's exit, which then flows into the pulse detonation tube and ignites the explosive mixture within. This invention, while maintaining the excellent initiation performance of the detonation jet ignition method, overcomes the adverse effects of long jet tubes and high-frequency ignition on the efficient and stable operation of pulse detonation turbine engines.

This invention discloses a shock absorber, suspension system, vehicle, and suspension control method for eliminating high-frequency pulsations. The shock absorber includes: a cylinder containing a main piston that divides the cylinder interior vertically into an upper main chamber and a lower main chamber; a compression valve and a return valve on the main piston; a piston rod connected to the top of the main piston, extending upwards through the cylinder; and an inner shell connected to a hollow rod. An elastic component is located inside the inner shell, dividing the inner shell vertically into an upper secondary chamber and a lower secondary chamber. The hollow rod extends upwards through the main piston, with its two ends connected to the upper main chamber and the upper secondary chamber, respectively. A throttling orifice connected to the lower secondary chamber is located on the bottom side of the inner shell. This invention adds a structure within the cylinder that can elastically attenuate fluid impacts, effectively reducing pulsations, minimizing the impact of large-amplitude, high-impact compressive damping forces, reducing the direct transmission of road impacts to the vehicle body, and improving vehicle ride smoothness.

The application relates to the technical field of micro fans, in particular to a multi-jet-hole guide fan, which comprises a fan body and a guide device arranged on one side or both sides of the fan body through a gap, at least two jet-hole units are arranged on the side of the fan body close to the guide device, and each jet-hole unit comprises at least two jet holes arranged at intervals, in the application, the design of a single first guide channel with multiple jet holes can help to expand the suction range when the airflow sprayed by the multiple jet holes enters the corresponding first guide channel after passing through the guide cavity, meanwhile, the one-to-many mode can reduce the local pressure peak value, inhibit the formation of turbulent flow and the impact on the wall surface of the first guide channel, and is beneficial to improving the flow and reducing the noise; on the other hand, the setting of the convex part can force the circumferential gas to smoothly turn along the surface of the convex part, reduce the airflow separation area, and reduce the instability of the shear layer.

The present invention provides a compressor and a refrigeration unit with the effect of reducing the pressure drop of supplementary air. The compressor includes a shell, a compression chamber is formed inside the shell, and a supplementary air chamber is also provided on the shell. The compressor and refrigeration unit with the effect of reducing the pressure drop of supplementary air provided by the present invention directly provide the supplementary air chamber on the shell, which overcomes the problem in the prior art that an additional buffer tank is provided on the supplementary air pipeline to reduce the vibration caused by the supplementary air pipeline and increase the cost and size of the unit, effectively simplifies the unit structure, reduces the cost of the unit, and at the same time reduces the diameter of the connecting hole, reduces the connection time and the connecting area between adjacent tooth grooves, thereby reducing the problem of gas leakage between adjacent tooth grooves, thereby achieving the purpose of reducing pressure pulsation and reducing pressure drop, and improving the volumetric efficiency of the compressor during compression, thereby improving the efficiency of the compressor and the refrigeration unit.

The utility model relates to the technical field of energy storage, in particular to a working condition self-adaptive water pumping and compressed air energy storage device which comprises a water storage pond, a reversible pump turbine, a water-gas co-containing cabin and a compressor. The water storage tank is connected with one end of the reversible pump turbine through a first pipeline, and the other end of the reversible pump turbine is connected with the water-gas co-containing cabin through a second pipeline; an alternating-current excitation motor is arranged on the reversible water pump water wheel, and a double-fed converter is arranged on the alternating-current excitation motor; the AC excitation motor and the double-fed converter are electrically connected with the power grid, can generate and supply power to the power grid, and can absorb the power of the power grid to drive a mechanical load. Compared with a fixed-rotating-speed synchronous motor in a traditional energy storage device, the alternating-current excitation doubly-fed motor is variable in rotating speed, by continuously changing the rotating speed, the alternating-current excitation doubly-fed motor can adapt to continuously-changing working conditions, pressure pulsation is reduced, it is ensured that a water pump and a water turbine always run in the optimal working condition, and high efficiency of energy conversion is ensured.