1056 results about "Needle valve" patented technology

The invention discloses a pipeline pressure relief structure and a pressure relief valve with the pressure relief structure, and relates to the field of pressure relief valves, the pipeline pressure relief structure comprises a main valve, a tower-shaped valve core, a pressure gauge, an amplification gear and a labor-saving lever, and changes the situation that in the prior art, precision of a pilot valve is adjusted through a needle valve, and the needle valve and the pilot valve need to continuously play a sensing role through similar structures such as springs; a tower-shaped valve element is arranged in a main valve to conduct multi-section control over flow, then driving force on the tower-shaped valve element is amplified in a multiplied mode through a hinge rod, an amplification gear and a labor-saving lever, accurate adjustment of the tower-shaped valve element is guaranteed, and the control precision of equipment is guaranteed. In addition, the pressure gauge is connected in the pilot valve through the oil bag, and the carry block facilitating adjustment of the elastic force of the piston by the spring is arranged, so that the pilot valve can be calibrated according to the display of the pressure gauge and the flow change of the main valve, the service life of the pressure relief valve structure is prolonged, and more accurate adjustment and use of the pressure relief structure are ensured.

The invention provides a double-curved-surface hole wall rotational flow umbrella oil nozzle for low-carbon fuel and a machining method, and relates to the technical field of gas turbine fuel injection. The nozzle comprises a needle valve, a needle valve seat, a spraying hole and a rotational flow groove; the needle valve and the needle valve seat form a sealing conical surface, the inner wall face of a spraying hole of the curved-surface rotational flow umbrella spraying nozzle is a double curved surface, the double curved surface and the sealing conical surface form a ruled surface, the rotational flow groove is formed in the inner wall face of the spraying hole, and the direction of the rotational flow groove is the generatrix of the ruled surface. The inner wall face of the spraying hole is designed to be the curved face, fuel is better guided to flow in the oil nozzle, the area of a low-pressure area is reduced due to sudden change of the direction in the fuel flowing process, and therefore cavitation is restrained from occurring and developing, and the phenomena that the spraying hole is blocked and mist spraying is unstable due to cavitation are improved; the rotational flow grooves in the curved surface can be achieved through the electric spark machining technology, the machining difficulty is reduced, meanwhile, the turbulent kinetic energy and the radial momentum of fuel can be effectively improved, spray distribution is more uniform, and the atomization quality is improved.

The invention belongs to the technical field of monitoring equipment, and discloses a supercritical carbon dioxide contact angle direct monitoring system and method.A first needle valve is connected with the bottom of a high-temperature and high-pressure reaction kettle, the other side of the first needle valve is connected with a supercritical carbon dioxide storage device, and a heater is arranged on the periphery of the columnar high-temperature and high-pressure reaction kettle; a sight glass is arranged on the side face of the high-temperature and high-pressure reaction kettle, a light source is arranged on the left side of the high-temperature and high-pressure reaction kettle, the top of the high-temperature and high-pressure reaction kettle is connected with a second needle valve, the other side of the second needle valve is connected with a water injection pump, and a CCD camera is arranged on the right side of the high-temperature and high-pressure reaction kettle and connected with a computer. The computer is connected with the high-temperature and high-pressure reaction kettle through the temperature sensor and the pressure sensor. According to the invention, the change of the contact angle of the supercritical carbon dioxide can be accurately monitored and analyzed in real time, and an effective tool is provided for researching the wettability of the supercritical carbon dioxide and the effects of anisotropy, cohesiveness, adsorptivity and the like of the surface of a material.

The invention discloses a methanol direct injection injector, comprising: an injector body and a solenoid valve component, an orifice plate, a control valve seat and a needle valve component which are installed below the injector body through a tight cap of the injector body; wherein the solenoid valve component is located above the orifice plate, the orifice plate is located above the control valve seat, and the control valve seat is located above the needle valve component; a first and a second straight hole are arranged on the orifice plate, an inclined hole, a third straight hole and two small holes are arranged on the control valve seat, a needle valve component control chamber is arranged on the upper part of the needle valve component, the lower end of the first straight hole is communicated with the lower end of the second straight hole on the orifice plate and the upper ends of the inclined hole, the third straight hole and the two small holes on the control valve seat, and the lower ends of the inclined hole, the third straight hole and the two small holes on the control valve seat are communicated with the needle valve component control chamber; the opening and closing of the second straight hole on the orifice plate is controlled by turning on and off the power of the solenoid valve component, and then the methanol liquid pressure in the control chamber of the needle valve component is controlled to realize the start of the needle valve component injection.

The common rail oil injector with the static leakage structure comprises an oil injector body, a control valve seat, a control valve matching part, a needle valve assembly and a needle valve body, and is characterized in that a middle hole pressure storage cavity is formed in the oil injector body and used for containing the control valve matching part and the needle valve assembly; the control valve matching part serves as the only static leakage matching part and is composed of a control valve sleeve and a control valve rod in clearance fit with the control valve sleeve, a static oil return channel comprising a first inclined oil return hole, a first vertical oil return hole and an annular groove is constructed in the control valve sleeve, a second oil return through hole in the high-pressure sealing face of the control valve seat is matched, and a specific fuel leakage backflow path is formed. Compared with a traditional 2000 bar common rail oil injector, static leakage matching parts are reduced, the fuel oil leakage amount is greatly reduced, oil consumption is effectively reduced, carbon emission is reduced, meanwhile, the reliability of the oil injector is improved, and the service life of the oil injector is prolonged. The middle hole pressure storage cavity can reduce oil injection pressure fluctuation, and the average effective injection pressure and the multi-time oil injection precision are improved. The oil injector body and the needle valve body are simplified in structure, and machining difficulty and manufacturing cost are reduced.

The invention relates to the technical field of injection molds, and discloses a liquid silica gel injection mold convenient for glue amount control, the liquid silica gel injection mold comprises an upper mold plate, a lower mold plate and a temperature control box, a splitter plate is arranged between the upper mold plate and the lower mold plate, the upper mold plate is provided with a glue injection port, and the glue injection port is connected with a plurality of liquid silica gel cold nozzles through the splitter plate; a main runner communicated with the glue injection port and a plurality of sub-runners communicated with the main runner are arranged in the splitter plate, the sub-runners are arranged below the main runner in a communicating manner, the sub-runners comprise a first sub-runner and a second sub-runner which are symmetrically arranged, and each of the first sub-runner and the second sub-runner comprises a first arc-shaped section, a second arc-shaped section and a converging section; the liquid silica gel cold nozzle comprises a valve needle driving assembly, a valve needle connected to the output end of the valve needle driving assembly and a cold nozzle body, the cold nozzle body is integrally connected to the lower portion of the valve needle driving assembly, one end of a piston piece of the valve needle driving assembly extends out of the upper die plate to be connected with an adjusting piece, and the other end of the piston piece extends into a cold nozzle runner to be connected with the valve needle to form an adjustable needle valve structure.

The invention relates to an independent inner and outer needle valve type flexible fuel injector which comprises an injector shell, internally and externally nested needle valve matching parts, an electromagnetic control valve assembly and a double-row injection hole structure, and a diesel oil high-pressure oil way and a low-carbon fuel high-pressure oil way are arranged in the injector shell; the electromagnetic control valve assembly is arranged in the upper portion of the ejector shell, independently controls diesel oil injection and is of a hydraulic balance valve structure. Needle valve matching parts nested inside and outside are installed at the bottom of the ejector shell and connected with the electromagnetic control valve assembly through a spring guide sleeve, a limiting block and a middle rod. A double-row spray hole structure is arranged at the bottom of the internally and externally nested needle valve matching part; the inerting valve set is connected to the low-carbon fuel high-pressure oil way and used for purging and inerting during fuel switching. By means of the nesting needle valve, the diesel oil lubrication seal, the independent control valve and the inerting design, efficient and stable dual-fuel injection is achieved, the problem of mixing in the prior art is solved, the service life of the injector is prolonged, and the dual-fuel injector is suitable for ship engines with alternative fuel such as methanol / ammonia.

The invention relates to the technical field of vehicles, and particularly discloses an ejector, an engine and a vehicle, the ejector comprises a machine body, an oil duct switching assembly, a needle valve assembly and a driving assembly, the oil duct switching assembly comprises a first oil valve and a first moving rod which are in sliding connection, and a first pressure chamber is arranged in the first oil valve; an outlet of the first oil inlet channel communicates with the first pressure chamber, and the first sealing part on the first moving rod is arranged in the first pressure chamber. A first flat position and a second flat position are arranged on a needle valve body of the needle valve assembly in a spaced mode, the injection channel is sequentially divided into a first liquid inlet section, a second liquid inlet section and a liquid outlet section from an inlet to an outlet of the injection channel, an outlet of the first oil outlet channel is communicated with the first liquid inlet section, and an outlet of the second oil outlet channel is communicated with the second liquid inlet section. The driving assembly can drive the first moving rod to move, so that the first sealing part can selectively block and seal an inlet of the first oil outlet channel or an inlet of the second oil outlet channel, and therefore the injection rule of the injector is adjusted.

The present disclosure relates generally to manufacturing pharmaceutical products using additive manufacturing technology. An exemplary printing system comprises: a material supply module for receiving a set of printing materials; a flow distribution module comprising a flow distribution plate, wherein the material supply module is configured to transport a single flow corresponding to the set of printing materials to the flow distribution plate; wherein the flow distribution plate comprises a plurality of channels for dividing the single flow into a plurality of flows; a plurality of nozzles, wherein the plurality of nozzles comprises a plurality of needle-valve mechanisms; one or more controllers for controlling the plurality of needle-valve mechanisms to dispense the plurality of flows based on a plurality of nozzle-specific parameters; and a printing platform configured to receive the dispensed plurality of flows, wherein the printing platform is configured to move to form a batch of the pharmaceutical product.

The utility model provides a high-precision microfluidic electrically operated valve, which relates to the technical field of valves, and comprises a gear box, two gear sets are arranged in the gear box, a power input assembly is arranged at the bottom of one gear set, the power input assembly comprises a speed reducer and a servo motor, the servo motor is arranged at the bottom of the speed reducer, and the servo motor is arranged at the bottom of the speed reducer. The power input assembly drives the two gear sets to move, then the direction of force is modified, then the force is transmitted to the linear displacement assembly, the linear displacement assembly changes the direction of the force from rotating motion to linear motion to push the valve needle body, and the multi-sensor assembly is responsible for sensing the stress condition and the displacement amount of the control valve assembly. The opening degree of the valve is controlled to realize micro flow control and prevent the needle valve body from being damaged by too large force.

The invention discloses a dual-fuel engine combustion method based on internal and external cooperative injection of a methanol engine, and belongs to the field of methanol fuel engines. The combustion method is realized on the basis of combustion of a diesel / methanol dual-fuel engine with internal and external cooperative injection of a methanol engine, a combustion chamber is formed by a cylinder cover, a cylinder and a piston, an internal and external concentric needle valve oil injector and an in-cylinder direct injection methanol injector are mounted on the cylinder cover, and a methanol port injector is mounted on an intake manifold; the high-reaction-activity diesel oil adopts a double direct injection technology; the low-reactivity methanol fuel adopts an in-cylinder high-low pressure injection and port fuel injection technology, the injection pressure, the injection timing and the injection frequency of the in-cylinder methanol injector are controlled, the gas distribution phase and the valve motion law are adjusted according to the operation condition of the engine, and mixed gas concentration layering of different gradients is formed. The ratio, the injection rule and the injection timing of the diesel oil and the methanol fuel can be flexibly adjusted, and stable operation of multi-mode combustion and high-efficiency clean combustion of the engine is achieved.

The invention discloses a breathing synchronization pulse oxygen supply device and method, and relates to the technical field of medical instruments, the breathing synchronization pulse oxygen supply device comprises a valve body assembly, an oxygen saving assembly and a gear adjusting assembly, the valve body assembly is composed of an upper cover, a valve body, a valve body middle plate, a valve body lower plate and a pressing plate; the oxygen saving assembly is composed of a pilot diaphragm, a pilot spring, a main valve rod, a main valve rod spring, a main valve piston, a pilot valve rod, a pilot valve rod spring, a pressure supplementing needle valve, a pressure relief needle valve and a plurality of sealing rings. The gear adjusting assembly is composed of an adjusting ring and a gear plate. When the breathing synchronization pulse oxygen supply device works in the pulse oxygen supply mode, pulse type oxygen supply is achieved, and when the breathing synchronization pulse oxygen supply device works in the continuous oxygen supply mode, continuous oxygen supply is achieved. The structure that the metal piston is matched with the sealing ring is adopted, aging is not prone to occurring, the single-connector mode is adopted, cost is saved, and compatibility is improved; the oxygen outlet duration during inspiration is adjusted by adjusting the needle valve, operation is easy, control is easy, and the uniformity and stability of the oxygen outlet duration are improved.

The utility model is applicable to the technical field of hot runners, and provides an integral needle valve type hot runner, which comprises a splitter plate, a glue inlet is arranged at the top of the splitter plate, a plurality of hot nozzles are arranged at the bottom of the splitter plate, a nozzle core is arranged in each hot nozzle, and the nozzle core is arranged in the splitter plate. A runner for communicating the glue inlet with each nozzle core is arranged in the splitter plate, and heating wires are arranged on the upper surface and the lower surface of the splitter plate. According to the integral needle valve type hot runner, the plurality of hot nozzles are mounted on the splitter plate, and are uniformly heated by the heating wires on the surface of the splitter plate, so that heating rings of the hot nozzles are omitted, a space for mounting the heating rings does not need to be reserved on the surfaces of the hot nozzles, the lengths of the hot nozzles can be reduced, and the thickness of a template can be further reduced; and a small-tonnage injection molding machine can be used for carrying out injection molding processing on small workpieces, so that production is more convenient.

The utility model relates to the technical field of breather valve detection equipment, in particular to a breather valve online detection device which comprises a first pipeline, the tail end of the first pipeline is connected with the air inlet end of a stop valve, and the air outlet end of the stop valve is connected with the air inlet end of a pressure reducing valve through a second pipeline. The air outlet end of the pressure reducing valve is connected with the air inlet end of a first three-way switching valve through a third pipeline, the first air outlet end of the first three-way switching valve is connected with the first air inlet end of a second three-way switching valve through a fourth pipeline, and the air outlet end of the second three-way switching valve is connected with the first air inlet end of a pressure stabilizing tank through a fifth pipeline. And a balance needle valve is arranged at the first air outlet end of the pressure stabilizing tank. The breather valve online detection device can perform online detection on the breather valve, and improves the efficiency.

The present disclosure relates generally to manufacturing pharmaceutical products using additive manufacturing technology. An exemplary printing system comprises: a material supply module for receiving a set of printing materials; a flow distribution module comprising a flow distribution plate, wherein the material supply module is configured to transport a single flow corresponding to the set of printing materials to the flow distribution plate; wherein the flow distribution plate comprises a plurality of channels for dividing the single flow into a plurality of flows; a plurality of nozzles, wherein the plurality of nozzles comprises a plurality of needle-valve mechanisms; one or more controllers for controlling the plurality of needle-valve mechanisms to dispense the plurality of flows based on a plurality of nozzle-specific parameters; and a printing platform configured to receive the dispensed plurality of flows, wherein the printing platform is configured to move to form a batch of the pharmaceutical product.

A forward and reverse bidirectional flow rate metering method for an underwater chemical agent injection device. The underwater chemical agent injection device comprises a device body, wherein the device body comprises an agent input joint (1), a pressure reduction member (2), a needle valve assembly (5) and an agent output joint (3), which are sequentially in communication by means of a flow channel. The method comprises: first, respectively performing forward calibration and reverse calibration by means of an agent at different opening degrees and different flow rates, during which a differential pressure is synchronously acquired before and after the agent flows through a needle valve assembly (5); then, fitting relationships between flow rates and differential pressures under different opening degrees of the needle valve assembly (5), so as to obtain several opening degree-flow coefficient arrays; and then fitting relationships between flow coefficients and the opening degrees, and establishing equations for the flow rate, opening degree and differential pressure.

The invention discloses marking equipment for road traffic planning, and relates to the technical field of road marking. The marking equipment for road traffic planning comprises a spray head pipe, and a gas pipe and a material injection pipe are arranged on one side of the spray head pipe and used for gas injection and material injection respectively; the needle valve rod is located in the spray head pipe, a blocking ball is arranged at the lower end of the needle valve rod and used for blocking or not blocking the spray hole, a piston plate is fixed to the upper end of the needle valve rod, and a reset spring is arranged between the piston plate and the inner top end of the spray head pipe. The movable valve plate is jacked to open the pressure relief pipe while the three-way valve cuts off the material injection pipe, so that the air pressure in the nozzle pipe is reduced, the paint spraying inertia caused by sudden pressure drop is effectively eliminated through the stepped reduction of the air pressure, and the blocking ball is pushed to block the spraying hole through the synergistic effect of the reset spring and the air pressure difference, so that physical secondary sealing is formed. Mechanical-pneumatic double-drive sealing is achieved, so that paint leakage is reduced, and paint point accumulation caused by sudden pressure increase or sudden pressure drop at the starting end and the stopping end of the marking line is avoided.

The invention relates to the technical field of atomization spraying, and discloses an automatic atomization spraying device and an atomization cooling method.Through arrangement of a cleaning assembly, in the process that an adjusting rod drives a needle valve rod to move, a scraping piece on the needle valve rod can stretch out and draw back by the corresponding length on the needle valve rod along with the change of the distance between a liquid outlet and the outer side of the conical end of the needle valve rod; the needle valve rod is driven by the transmission rod to rotate along with the movement of the adjusting rod, so that the scraping blade abuts against the inner wall of the liquid outlet all the time when the scraping blade is in the liquid outlet, and meanwhile, the needle valve rod is driven by the transmission rod to rotate along with the movement of the adjusting rod, so that the scraping blade abutting against the inner wall of the liquid outlet is driven to rotate, and scale attached to the inner wall of the liquid outlet is removed and scraped; and the needle valve rod rotates in opposite directions when being pulled and inserted in the liquid outlet, so that the scraping blade can scrape water scales from different directions, the scraping capacity of the scraping blade is further improved, the liquid outlet of the nozzle can be kept smooth, and the atomization effect of the device is improved.

The utility model belongs to the technical field of on-line analysis of tail gas emission, and particularly relates to a stable-pressure sampling device of an FTA analyzer. Comprising a sampling probe, a high-temperature electric heat tracing integrated pipe cable, a stop valve, a bypass filter, a sample injection pressure reducing valve, a sample injection needle valve, a sample injection pneumatic valve, a sample injection pressure transmitter, a bypass flowmeter, an instrument air pressure reducing valve, an I / P controller, a PID control unit, an FTA analyzer, a box body heater, a pretreatment heat preservation box and the like. According to the pretreatment pressure stabilizing system disclosed by the utility model, through the design of the connection relation among the structures of the pretreatment pressure stabilizing system, pressure stabilizing sampling can be realized under the condition of pipeline pressure fluctuation, and the measurement accuracy of real-time monitoring of chemical tail gas is improved.

The invention relates to the technical field of pulse tube refrigerator phase modulation, and provides a dual-channel regulation and control direct current needle valve for pulse tube refrigerator phase modulation, the dual-channel regulation and control direct current needle valve for pulse tube refrigerator phase modulation comprises a valve seat and a valve core, the valve seat is provided with a valve cavity and a first flow channel communicated with the valve cavity; a valve hole is formed in the first flow channel; the valve element is movably installed in the valve cavity, the valve element is provided with an abutting end which is movably connected with the valve hole in an abutting mode, and the valve element and the valve hole are matched to control the flow of the first flow channel; a second flow channel is formed in the valve element, one end of the second flow channel penetrates through the end face of the abutting end to be correspondingly communicated with the valve hole, and the first flow channel and the second flow channel are arranged in parallel. On the premise that an additional phase modulation auxiliary device is not introduced, the phase adjustment difficulty of the pulse tube refrigerator can be effectively reduced.

The invention discloses a high-pressure hydrogen pressure reducing valve with a spiral flow channel structure. The high-pressure hydrogen pressure reducing valve comprises a valve body, a sealing end cover, a needle-shaped valve element and an inlet end cover. A through cavity is formed in the center of the valve body in the axial direction. The sealing end cover, the needle-shaped valve element and the inlet end cover are sequentially and coaxially assembled and connected into the cavity of the valve body from top to bottom. A gas outlet channel is arranged on the side wall of the valve body and located between the sealing end cover and the needle-shaped valve element, a gas inlet channel is arranged at the bottom of the inlet end cover, and gas enters from the gas inlet channel and is exhausted through the gas outlet channel. The needle valve has the advantages of being simple in structure and long in service life, and the two spiral flow channel notches are evenly distributed in the outer surface of the needle valve element; due to the design of the spiral flow channel, the hydrodynamic performance is effectively improved, the reliability of the system is enhanced, and meanwhile the energy utilization rate and the impact resistance are improved; in addition, the pressure of hydrogen at the outlet of the valve body can be effectively controlled through the design of the adjusting channel, and the pressure is still kept relatively stable under extreme conditions.

The invention relates to a high-temperature and high-pressure testing device and method for a packer, and belongs to the technical field of petroleum engineering. The temperature in the test shaft is controlled through the electric heating belt, the upper connector is sleeved at the A end of the test shaft, the connector is in threaded connection with the upper connector, the first screwed plug is sleeved on the connector in a buckling mode, the second screwed plug is sleeved at the B end of the test shaft, and the first meter bushing and the second meter bushing are respectively installed on the upper side faces of the upper connector and the second screwed plug. The first high-temperature pressure gauge and the second high-temperature pressure gauge are used for measuring the pressure at the two ends of the test shaft respectively, and a first steel pipe and a second steel pipe are installed on the lower side faces of the upper connector and the second screwed plug respectively. And the ferrule type three-way pipe joint is provided with a proportional unloading valve and a high-temperature and high-pressure needle valve. According to the invention, underground high-temperature and high-pressure environments can be simulated, and the sealing effect of the packer is detected by respectively controlling the pressures on the two sides of the packer.

According to the pressure generating device for well drilling, in the device, a plurality of upper rotational flow blades are located below an overflowing channel and arranged around a main shaft, and a plurality of lower rotational flow blades are located below the upper rotational flow blades and arranged around the main shaft; the upper overflowing disc is transversely fixed in the lower connector and comprises an upper main overflowing hole, an upper auxiliary overflowing hole and two needle valve holes. The axial bevel gear is in threaded connection with the bottom end of the main shaft, the radial bevel gears are matched with the axial bevel gear at 90 degrees respectively, and the two cams are fixedly connected with the radial bevel gears through key grooves respectively; the lower overflowing disc is transversely connected with the lower connector and located below the upper overflowing disc, the lower overflowing disc comprises a lower main overflowing hole and a lower auxiliary overflowing hole, the needle valves are arranged in the needle valve holes in a penetrating mode and located below the cam, circumferential rotation of the cam is converted into axial reciprocating motion of the needle valves, and the axial reciprocating motion of the needle valves enables the lower auxiliary overflowing hole to be opened and closed. The pressure of the drilling fluid is switched between a low point and a high point so as to generate periodic hydraulic pressure changes. The device relieves backing pressure and improves drilling efficiency.

The invention relates to a needle valve driving device in a hot runner system, and discloses a needle valve driving device arranged on a hot runner support and an assembling method of the needle valve driving device. The device comprises a material collecting bowl, a driving cavity, a piston disc and a needle valve adjusting piece, and a shell of the driving cavity rotates in a resistance mode relative to the material collecting bowl so as to adjust routing of a driving flow path on a hot runner support and adjust the tightness of a valve needle. By arranging an adjusting hole, a first buckling groove, a limiting ring groove, an axial limiting rod and other structures, stable assembly of the device and adjustability of the lifting position of the valve needle and routing of the driving flow path are ensured. In particular, the problems that the position of the needle valve adjusting piece is difficult to adjust and the needle valve adjusting piece moves and displaces under the rotation characteristic of the driving cavity can be solved through the combination of a first positioning hole, a positioning notch, a plugging piece and a tensioning piece. The structural design of the adjustable needle valve driving device in the hot runner system is optimized, the assembling flexibility and reliability are improved, and meanwhile, the height of the valve needle is conveniently and accurately adjusted, and driving flow path wiring is maintained.

This invention relates to a methanol fuel injector for an engine, comprising an injector body, a solenoid valve, a needle valve rod, a needle valve spring, and a needle valve. The solenoid valve is disposed on the top of the injector body. The solenoid valve includes a valve body, an electromagnet, and a solenoid valve spring. A control oil accumulator chamber is formed between the valve body and the needle valve spring. A control oil inlet is provided on one side of the injector body, communicating with the control oil accumulator chamber. A low-pressure chamber is formed between the valve body and the injector body. A control oil return port is provided on one side of the injector body, communicating with the low-pressure chamber. A methanol inlet passage is formed between the needle valve rod and the injector body. A methanol fuel accumulator chamber is formed between the needle valve and the injector body. A methanol inlet and return port is provided on one side of the injector body, communicating with the methanol inlet passage. This invention solves the problem of rapid wear of the control valve and effectively controls the upward leakage of methanol by introducing a piston structure.

The utility model discloses a novel impulse turbine brake device which is characterized in that the center of a power generation rotating wheel disc is connected with a main shaft of a generator, a plurality of power generation water buckets are arranged around the power generation rotating wheel disc, an annular water distribution pipe is arranged on the outer sides of the power generation water buckets in the circumferential direction, and a plurality of power generation water spraying devices are arranged on the inner side of the annular water distribution pipe; a plurality of brake water buckets are arranged on the brake rotating wheel disc in a surrounding mode, a water pipe is arranged on one side of the end of the annular water distribution pipe, and a brake spray pipe is arranged at the tail end of the water pipe. When the power generation water turbine works, the braking water turbine shrinks in the concave cavity of the power generation rotating wheel disc, and power generation is not affected; when the power generation water wheel stops or breaks down, the brake shaft is controlled by the hydraulic operating mechanism to extend and drive the brake water turbine to enter a brake station, and the hydraulic needle valve on the brake spray pipe is opened, so that the impulse water turbine is quickly braked. The device effectively improves the braking efficiency and the operation stability of the impulse turbine, and is worthy of being vigorously popularized in future impulse power stations.

The invention relates to the field of power and energy engineering, in particular to a methanol-diesel dual-fuel internal mixing type fuel injector capable of being independently controlled. In order to overcome the defects that in the prior art, a dual-fuel injection system is complex in structure, the size of an oil injector is large, a cylinder cover is difficult to install, the fuel premixing capacity is poor, and injection control is not flexible, the technical scheme is that the methanol-diesel oil dual-fuel internal mixing type oil injector capable of being independently controlled comprises an oil injector shell; the fuel injector shell is provided with a methanol fuel inlet, a diesel fuel inlet, a fuel injection hole as well as a methanol oil way and a diesel oil way which are respectively connected with the methanol fuel inlet and the diesel fuel inlet; a methanol control assembly, a diesel oil control assembly, a pressure control chamber, a ball valve, a needle valve and a premixing pressure cavity are arranged in the oil injector, injection of methanol and injection of diesel oil can be controlled respectively, and mixed injection of two kinds of fuel can be achieved in the premixing pressure cavity. The methanol-diesel oil dual-fuel efficient mixed injection system is suitable for modification work of an engine oil injection system needing to achieve methanol-diesel oil dual-fuel efficient mixed injection and precise control in the fields of ship power, heavy vehicles, engineering machinery and the like.

The utility model provides a dispensing valve which comprises an upper valve body, a lower valve body, a dispensing nozzle and a dispensing nozzle outer cover. According to the utility model, a two-stage valve closing structural form is adopted, when dispensing is finished, the glue sealing head in the first stage is firstly closed, and the glue sealing head adopts a reverse valve closing form, so that when the valve is closed, the space of the first back-suction cavity is enlarged, the pressure in the first back-suction cavity is reduced, and an instantaneous back-suction phenomenon is formed; after residual glue in a glue outlet hole, a second material cavity I and a second material cavity II in the second stage is sucked back to a back suction channel and a first back suction cavity, a needle valve in the second stage is closed again, at the moment, no residual glue exists in the glue outlet hole, the second material cavity I and the second material cavity II, no residual glue is naturally extruded out when a valve needle is closed, the problems of glue hanging, glue dripping, large glue lumps and the like are prevented, and the service life of the glue pump is prolonged. When the valve needle in the second stage is closed, air enters the air inlet channel and is blown out from the air blowing opening after passing through the air blowing cavity, and the problem of wire drawing is prevented.

The invention relates to a jet pump (2) for supplying hydrogen in a fuel cell system, comprising a nozzle device (10) and a needle (30) adjustably guided in a bearing bore (13) of the nozzle device (10) for changing an outlet cross-section relative to the nozzle device (10). To ensure long-term, reliable operation of the jet pump (2), the nozzle device (10) has a recess (24) extending along the needle (30) on the bearing bore (13) and / or a recess (25) extending along the needle (30) next to the bearing bore (13). The invention further relates to a bearing for the needle (11) for a jet pump (2).

The invention provides a fuel injector, an injection system, an injection method and an engine. Wherein the fuel injector comprises a needle valve matching part, the needle valve matching part comprises a needle valve body and a needle valve, and the needle valve is arranged in a mounting space provided in the needle valve body; the pilot valve comprises an armature and an electromagnet, and the electromagnet can drive the armature to move; the middle block is arranged between the needle valve matching part and the pilot valve, the pilot valve is installed on one side of the middle block, and the needle valve matching part is installed on the other side of the middle block; wherein the middle block is provided with a first hole matched with the armature and a second hole matched with the end portion of the needle valve, and the end portion of the armature and the end portion of the needle valve are in fluid communication through a control cavity. And the oil nozzle is arranged at the other end part of the other end of the needle valve and corresponds to the needle valve body.