75results about How to "Reduce dynamic pressure" patented technology

A liquid ejection head ejecting a liquid contained in a liquid reservoir from nozzle apertures through a plurality of liquid supply channels includes a first liquid supply member and a second liquid supply member that define the plurality of liquid supply channels. A filter is disposed between the first supply member and the second supply member. The filter includes a plurality of filter portions corresponding to the respective liquid supply channels and at least one joining portion disposed across the region between the filter portions to join the filter portions to each other. The first supply member and the second supply member are bonded together at the region corresponding to the joining portion of the filter with a resin joint that is made of a resin penetrating the joining portion.

A personal watercraft has a jet pump propulsion device. An engine powers the propulsion device and a control device controls engine speed. A steering mechanism steers a thrust direction of the propulsion device. An engine load sensor or an engine speed sensor senses an engine load or an engine speed, respectively. A steering position sensor senses an angular position of the steering mechanism. The control device decreases engine speed when the engine load or the engine speed is greater than a preset engine load or the engine speed, respectively, and the angular position of the steering mechanism is greater than a preset angular position.

Fuel is conveyed by at least one high-pressure pump from a low-pressure region into a high-pressure region including a pressure-accumulator line consisting of at least two separate accumulator units connected to one another by means of feed lines, and to fuel injectors for the cylinders. The accumulator units each have an accumulator volume for serving at least two cylinders, and accumulator covers provided on both end faces. All the functional units are integrated into these accumulator covers in terms of fuel delivery and transfer, and at least one separate pump accumulator is arranged in the high-pressure region between the high-pressure pump and the assembled pressure-accumulator line. The pump accumulator is connected to at least one accumulator cover of an accumulator unit of the pressure-accumulator line for fuel conveyance and is capable of being acted upon by at least one high-pressure pump.

The invention discloses an LNG immersed pump and belongs to the technical field of LNG. A stator and a rotor shaft are arranged in a motor cavity in the LNG immersed pump, and side wall channels are arranged in the side wall of a pump body; a motor upper cover is connected to the rear end of the pump body and provided with a plurality of liquid flowing channels communicated with the side wall channels, and the liquid flowing channels are arranged in an inclined mode and intersect with one another at a liquid outlet; a motor lower cover is connected to the front end of the pump body, liquid via holes communicated with the side wall channels are formed in the motor lower cover, a shell is connected to the motor lower cover to form a working cavity and provided with a first-stage flow guide disc to partition the working cavity into a front cavity and a rear cavity, a flow channel communicated with the front cavity and the rear cavity is arranged on the first-stage flow guide disc, a second-stage impeller is arranged in the rear cavity, a first impeller is arranged in the front cavity, a liquid inlet is formed in the front cavity in a connected mode, and an inducer is arranged in the liquid inlet; the rotor shaft penetrates through the motor lower cover and the working cavity and extends into the liquid inlet, and the first-stage impeller, the second-stage impeller and the inducer are all arranged on the rotor shaft in a sleeved mode. The LNG immersed pump is simple in structure and suitable for being popularized and used.

A system, including methods and apparatus, of tuning a mass-damping apparatus to reduce dynamics forces on a wind tunnel model during wind tunnel testing. The mass-damping apparatus is coupled to a wind tunnel model and may comprise first and second pressure chambers containing a gas, a mass configured to move back and forth between the pressure chambers in a substantially airtight manner and thereby to alter gas pressure within each pressure chamber, at least one spring configured to exert a position-dependent force upon the mass, and a passageway configured to allow the gas to pass between the chambers.

A fan control system includes first and second adjacent fans, first and second motors configured to rotate the first and second fans, and a control unit configured to control rotational speeds of the first and second motors in order to control rotational speeds of the first and second fans. The first and second motors are energized such that the rotational speeds of the first and second fans reach target rotational speeds prior to increasing the rotational speeds of the first and second fans to required rotational speeds. The target rotational speeds are lower than the required rotational speeds. The first and second motors are energized such that the rotational speeds of the first and second fans reach the required rotational speeds after the rotational speeds of the first and second fans reach the target rotational speeds.

The invention provides a fin and wing aeroelasticity test device of a high-speed wind tunnel. The fin and wing aeroelasticity test device of the high-speed wind tunnel comprises a protection mechanism, a supporting mechanism, a reflection board, a supporting baffle, a base and a bottom surface platform. The protection mechanism is arranged in front of the supporting mechanism and mainly comprises a protection cover, a guide rail and a cylinder. The cylinder is fixed to the lower portion of the base. The base is installed on the bottom surface platform, and the position of the base can be adjusted front and back. The protection cover is connected with the cylinder and the guide rail in a mode of moving vertically. The supporting mechanism is fixed to the base and used for supporting a model. The reflection board is arranged at the root of the model through the supporting baffle. The reflection board is provided with an opening matched with the protection cover and the model so that the reflection board cannot make contact with the protection cover or the model. The fin and wing aeroelasticity test device of the high-speed wind tunnel can be used for carrying out fin and wing aeroelasticity test research in the high-speed wind tunnel. The protection mechanism is used for protecting the model against impact from a wind tunnel flow field, and when the vibration amplitude of the model is large, vibration damage to the model can be prevented.

A personal watercraft has a jet pump propulsion device. An engine powers the propulsion device and a control device controls engine speed. A steering mechanism steers a thrust direction of the propulsion device. An engine load sensor or an engine speed sensor senses an engine load or an engine speed, respectively. A steering position sensor senses an angular position of the steering mechanism. The control device decreases engine speed when the engine load or the engine speed is greater than a preset engine load or the engine speed, respectively, and the angular position of the steering mechanism is greater than a preset angular position.

Volumetric flow meters, volumetric flow controllers, mass flow meters, and mass flow controllers using a transverse laminar flow assembly are described. The flow assembly may be constructed from a plurality of open and / or closed slices or layers stacked upon one another and held together in compression by through bolts or another means. Meter or flow controller accuracy may be aided by use of flow conditioning features preceding an axial bore of the transverse flow assembly including one or more of a deflector, filter and nozzle.

The present invention provides wind flow bodies for use with a structure for decreasing the carrier wing effect on the structure by the formation of turbulence or reducing the dynamic pressure by deflecting the wind flow. The invention further provides a method for securing the composition of a structure against the onslaught of heavy winds, whereby zones, which are suitable for the formation of a critical carrier wing effect during heavy wind flow are identified on the structure, and the position of a wind flow body for generating turbulence for dampening the carrier wing effect, is then determined. Further zones are identified which are suitable for the formation of the dynamic pressure, and the operating position of a wind flow body is then determined for deflecting the corresponding wind flow for reducing the dynamic pressure.

The present invention aims to make it possible to form a dynamic pressure generating portion by a simple process with high accuracy at a low cost. In order to achieve the object, in the present invention the dynamic pressure generating portion A is formed by the step of supplying a small amount of an ink 12 onto a surface of a material 2a′ to print the dynamic pressure generating portion A for generating a dynamic pressure of fluid in a bearing gap with an aggregate of the ink, and the step of hardening the ink 12.

The invention belongs to the field of drilling leakage prediction and the field of artificial intelligence machine learning, and particularly relates to a drilling leakage probability prediction method based on a naive Bayesian algorithm. The method comprises the following steps: extracting oil reservoir historical development data from an oil reservoir well history database of a certain oil reservoir development area, preprocessing the oil reservoir historical development data, creating a sample set and a test set, determining characteristic attributes and an output category space from the sample data, and counting the prior probability of each characteristic attribute value according to drilling leakage parameter data of the sample set; calculating conditional probabilities by adopting priori probability learning, calculating by adopting different conditional probabilities when feature attribute values are continuous values and discrete values, calculating corresponding conditional probabilities by selecting a mode of combining every two features to improve the generalization performance of the model, jointly calculating posteriori probabilities by adopting the priori probabilities, and establishing a naive Bayesian model classifier; performing verification by adopting the verification set, and inputting the real-time drilling parameter data into the model to obtain the corresponding leakage probability.

The present invention provides a deaerator and a deaerating method which enable the continuous deaeration of a liquid at a low cost. That is, with respect to a pipe which supplies a fluid by a supply means, a rip-out portion which rips out a fluid from an inner peripheral surface of the pipe is provided at a predetermined position in the inside of the pipe, and the fluid is supplied at a predetermined flow rate by a flow control means which adjusts the flow rate of the liquid which is supplied through the pipe so as to form a cavity on a downstream side of the rip-out portion. A through hole which communicates with the cavity is formed in the pipe, and deaeration of the liquid is performed by exhausting gases in the inside of the cavity by suction means such as a vacuum pump via the through hole.

This invention discloses a film lubrication method for thrust bearing roller cone races and ribs, which forms a wedge clearance between the large end surface of a roller and inside wall of a ring rib and fills it with lubrication oil, when the shape, size of the clearance and axial load, glide speed and viscosity of the oil are matched to each other, a dynamic pressure film is formed between the two surfaces, in which the wedge clearance is formed by cone roller spherical large end surface and the ring rib spherical ring, so it's easy to form a dynamic pressure film by selecting race SRQ of the inner surface of the race and axis ring and srq of the cone large end surface reasonably.

A tail kit assembly of a guided munition having a tail kit base connected to a trailing end of a projectile body. The tail kit base is rotatable relative to the projectile body. A trimmable rudder has forward and rearward ends. The forward end is pivotally coupled to the tail kit base, such that the trimmable rudder can, relative to the tail kit base, between retracted and extended orientations. An actuator is fixed between the tail kit base and the rearward end of the trimmable rudder. The actuator is electrically coupled to an onboard guidance system that controls actuation of the actuator to pivot the trimmable rudder between the retracted orientation and the extended orientation.

The invention provides an under-floor air supply data center refrigeration system. The under-floor air supply data center refrigeration system comprises two rows of cabinets, the air inlet ends of which are arranged in a face-to-face manner; air return devices, which are connected with the air outlet ends of the cabinets; air return ducts provided with built-in heat exchangers; a machine room elevated through hole floor; and a cooling channel formed by the cabinets, a channel door, the elevated through hole floor, and a top part closing plate in an encircled manner. The hot air exhausted by the air outlet ends of the cabinets are delivered by the air return devices to the heat exchangers for cooling. The heat exchangers are disposed in the air return ducts, and one side of each of the air return ducts is connected with the corresponding air return device, and the other side of each of the air return ducts is connected with the lower part of the elevated through hole floor. The cooled air enters the lower part of the floor, and is delivered to the cooling channel by the through hole floor after being mixed and stabilized. The cool air in the cooling channel is sucked in by the cabinets, and then is exhausted by the cabinets to complete heat dissipation circulation. The under-floor air supply data center refrigeration system is advantageous in that energy loss of a draught fan on an end of an air conditioner is saved, and problems of common under-floor air supply systems such as non-uniform air supply in the length direction of the cooling channel, two fast bottom air supply speed, small air inlet quantity of servers on the lower parts of the cabinets, and easy generation of local hot spots are improved, and therefore the internal temperature of the cabinets is reduced, and the integrated heat dissipation efficiency of the cabinets is improved.

A viscoelastic polisher to be used for polishing. The viscoelastic polisher includes a viscoelastic layer provided on a major surface of a base disk and having a hole of a predetermined radius formed in a center portion thereof, and the base disk has a plurality of grooves equiangularly provided in the major surface thereof as extending radially outward from a center portion thereof. This arrangement ensures stable supply of an abrasive liquid, and obviates a need for formation of grooves in the viscoelastic layer.

The present invention provides a valve device and a high pressure pump using the same. A valve seat (78) has an inner passage (781) and outer passages (782). A suction valve member (74) has first passages (743) and a first projection portion (744) that guides, to the first passages (743), the fuel that flows from a pressure chamber at the time of valve opening. Therefore, an action force by the dynamic pressure applied to the suction valve member (74) in the valve closing direction is reduced. An action force by the pressure of fuel that flows into pressure equalization grooves (746, 784, 785) counterbalances the action force by the dynamic pressure of the suction valve member (74). Therefore, self-closing by the dynamic pressure can be inhibited, and the maximum output of an electromagnetic driving unit can be reduced. Fuel flows through a passage radially outside the suction valve member (74) and the first passages (743). A fluid passage area is securable even when a lift amount of the suction valve member (74) is small. The maximum output of an electromagnetic drive unit also can be reduced.

The invention discloses a fleet management system. A fleet comprises one core vehicle and a plurality of team vehicles, wherein the core vehicle and the team vehicle are each provided with an OBD system, a V2V communication unit, a storage unit, a distance sensor and an execution unit, the core vehicle is further provided with a control unit, the V2V communication units communicate in a broadcasting manner among vehicles, on the one hand, the team vehicle receives a scheduling instruction form the core vehicle, on the other hand, the team vehicle transmits an equipment parameter and oil consumption condition to the core vehicle, the control unit of the core vehicle calculates an optimal distance between vehicles and load of the fleet, so that the fleet proceeds by a shortest vehicle distance, so as to reduce wind resistance loss and balance overall load of the fleet.

A prosthetic heart valve either of the mechanical type or the bio prosthetic type, comprises a tubular or cylindrical frame element, a plurality of injectors, a suturing member surrounding the tubular or cylindrical frame element, tether lines to secure the device during diastolic filling but more predominantly during systolic contraction that creates a vortex effect with externally supplied pressurized fluid injected angularly within a transport structure is provided. Such a unit is utilized to accelerate the hemodynamics, reduce the energy required for said transport or both. The annular frame is designed to allow a passageway for blood flow and regulating flow during systolic contraction. Such a result is achieved through the introduction of pressurized fluid (blood) via a plurality of injectors situated evenly around the circumference of the subject tubular or cylindrical unit, and angled uniformly for an even pressure injection of fluid within the conveyance component thereof.

The invention provides a low-noise and low-static-pressure air-conditioning system of a railway vehicle. The low-noise and low-static-pressure air-conditioning system comprises air conditioning unitsand airdelivery conduits, and has the characteristics that each vehicle is provided with the two air conditioning units, a draught fan of each air conditioning unit is arranged vertically at the two ends of the corresponding air conditioning unit to make the draught fan supply air downward, corresponding air supply outlets and air return inlets are placed at the two ends of the bottom portion of the corresponding unit, and every air supply outlet communicates with the corresponding air conduits; according to the low-noise and low-static-pressure air-conditioning system, the air return inlets are mounted on the two sides of the two ends of the bottom portion of the corresponding unit, the air return inlets (grilling) are installed on the two sides of an inner installation roof plate, and onthe same vehicle section as an air supply grilling, the grilling in an air supply area is the air supply grilling, the grilling in an air return area is an air return grilling, and the air supply grilling and the air return grilling are perfectly combined.

The invention discloses an exhaust fan. The exhaust fan comprises a box and a volute fan. The box comprises a cover plate, a side plate and a bottom plate. A containing cavity is defined by the coverplate, the side plate and the bottom plate. The volute fan comprises a volute, a wind wheel and a motor, and the volute is fixed in the containing cavity of the box and comprises a front end plate, arear end plate and a side panel, wherein a cavity is defined by the front end plate, the rear end plate and the side panel, and the wind wheel is arranged in the cavity. The cover plate is provided with a gap, and an opening is formed in the side plate. The front end plate is provided with a first air inlet. The side panel is provided with an air outlet. The gap, the first air inlet, the cavity, the air outlet and the opening are in communication so that a first ventilation channel can be formed. The rear end plate is provided with a second air inlet. An air flue is formed between the side plate and the side panel. A runner is formed between the rear end plate and the bottom plate. The gap, the air flue, the runner, the second air inlet, the cavity, the air outlet and the opening are in communication so that a second ventilation channel can be formed, one ventilation channel is additionally arranged, the air inlet area is increased, efficiency is improved, and noise is improved.

The invention relates to a control valve device used for controlling a double-acting hydraulic pressure cylinder of a mobile operation machine. The control valve device includes a control valve connected to a conveying pipeline, a container pipeline, an ascending pipeline and a descending pipeline of a pump. The control valve has a middle position, an ascending position and a descending position. The control valve device has a floating position. When the control valve is moved to the descending position, the ascending pipeline is connected with the container pipeline and the pump is connected with a descending side and switching meets failure. A release valve is arranged, so that the descending side can bypass the control valve to connect with the container and the descending side can be connected with the container in the floating position. When the control valve moves to the ascending position during ascending operation, the conveying pipeline is connected with the ascending pipeline and the descending side is enabled to connect with the container by the aid of the release valve during ascending operation, so that the descending pipeline is connected with the container through the release valve and pressure medium flow from the descending side flows to the container via the release valve.

The invention discloses an air duct of an air conditioner axial flow fan. The air duct comprises an inlet diversion segment, a straight segment and a diffusion segment. Air flow enters through the inlet diversion segment, flows in the axial direction and is output of the diffusion segment. The inlet diversion segment, the straight segment and the diffusion segment are integrally prepared. The inlet diversion segment is a hollow and smooth conical arc-shaped circular truncated cone body. The diameter of the inner wall of the inlet diversion segment successively decreases in the axial directionwith an air inlet as the start. The straight segment is a hollow cylinder with all the cross sections equal. The cross sectional area of the diffusion segment successively increases in the axial direction with the an air outlet of the straight segment as the start. The sum of the axial height of the inlet diversion segment and the axial height of the straight segment is larger than the axial height of the diffusion segment. With the air conditioner axial flow fan with the air duct, the noise of the flow fan can be obviously reduced, the performance and the efficiency of the flow fan can be improved, the integrated making technology of the air duct is simple, and the flow fan is easy and convenient to install and maintain.

The invention provides a plenum chamber with the purification function, the disinfection function and the sound absorption function. The plenum chamber comprises a plenum chamber body, a purification and disinfection device and sound absorption materials, wherein the plenum chamber body is a cuboid, any one side of the plenum chamber body can be connected with an air duct as needed, the mode of connection between the plenum chamber body and the air duct is the same as the mode of connection between a common air supply and discharge plenum chamber and the air duct, the purification and disinfection device is firmly installed in the plenum chamber body and between an air inlet and an air outlet, and the sound absorption materials are evenly attached to the outer wall of the plenum chamber body. The plenum chamber with the purification function, the disinfection function and the sound absorption function has the advantages that the plenum chamber with the purification function, the disinfection function and the sound absorption function is used for replacing the section with the purification function, the section with the disinfection function and the section with the sound absorption function in a combined air treatment unit, the length of the combined air treatment unit is reduced, the height of a machine room is sufficiently used, and the purification and disinfection device and the sound absorption materials are reasonably combined and arranged in the plenum chamber body. When the plenum chamber with the purification function, the disinfection function and the sound absorption function is applied, the size of the combined air treatment unit can be reduced, and the airflow stabilizing function, the sound absorption and noise reduction function, the disinfection function and the air purification function are achieved.