857 results about "Needle valve" patented technology

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 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 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 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.

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 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.

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 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 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.

The utility model relates to the technical field of PEM electrolytic baths, and provides a high-pressure drainage system based on a PEM electrolytic bath, which comprises a circulating water pump arranged at an inlet of the PEM electrolytic bath, a pressure sensor arranged at an outlet of the PEM electrolytic bath, and a primary gas-liquid separator, a pressure sensor and a second-stage gas-liquid separator are arranged at an outlet of the first-stage gas-liquid separator, the second-stage gas-liquid separator is provided with an upper liquid level sensor and a lower liquid level sensor, a back pressure valve is arranged at a gas outlet of the second-stage gas-liquid separator, and two pneumatic drain valves which are connected in parallel are arranged at a liquid outlet of the second-stage gas-liquid separator. A needle valve is arranged behind the pneumatic drain valve, and a needle valve is arranged behind the pneumatic drain valve. High-pressure and low-pressure drainage is performed by introducing the parallel pneumatic valve and the needle valve in a manner of dividing pressure levels and dividing drainage durations, so that the effects of discharging excessive water in equipment and keeping back pressure stable can be achieved during drainage under different pressure levels.

The utility model discloses a two-way throttle valve device for controlling a two-way hydraulic jar, which is characterized in that a valve body is axially provided with a drainage channel hole penetrating through two end surfaces of the valve body, the drainage channel hole comprises a valve needle hole in the middle, a valve needle is arranged in the valve needle hole, the valve needle hole consists of an upper striking valve needle hole and a lower striking valve needle hole, and the upper striking valve needle hole is communicated with the lower striking valve needle hole. The upper striking valve needle hole and the lower striking valve needle hole are different in hole diameter. According to the single-cavity two-way jar, the drainage channel hole penetrating through the two end faces is formed in the valve body and comprises the lower striking valve needle hole and the upper striking valve needle hole which are different in size, and only one valve needle is arranged in the valve needle hole, so that two-way throttling flow can be adjusted respectively, and control over different upper striking force and lower striking force of the single-cavity two-way jar is achieved. The bidirectional hydraulic jar is simple in structure, the single valve body has the bidirectional jar function of controlling the upward jar and the downward jar of the bidirectional hydraulic jar, the jar delay of the upward jar and the downward jar can be independently adjusted, the number of parts of the bidirectional hydraulic jar and the total length of tools are reduced, the manufacturing cost is reduced, and the bidirectional hydraulic jar is convenient to maintain.

The present disclosure relates to an improved digital control valve (DCV) system (100), featuring a piston-type design with a stepped piston and dual piston seals for precise flow rate control and enhanced batch accuracy under fluctuating upstream pressure (P1) conditions The piston (302) is hydraulically balanced to ensure smooth operation and reliable batch filling. The disclosure provides an Auto Tune Valve (ATV) (200) in place of conventional manually operated needle valves, offering tamper-proof, automated tuning based on line pressure by dynamically varying internal orifice size, thereby eliminating manual adjustment efforts. The improved DCV system is designed to addresses the challenge of closing the valve during electrical or mechanical failures, ensuring safety and environmental protection during batch filling operations. Two distinct dampening mechanisms are employed to mitigate sudden ramping up or down during pressure fluctuations, reducing vibration, noise, and stress on components, thereby enhancing reliability and service life. The improved DCV system ensures efficient, automated operation under varying conditions, delivering consistent safety and performance.

The utility model relates to a pneumoelectric integrated ignition head device for an automatic flash point tester, which comprises an ignition head and a control system, the ignition head comprises an alundum tube, a thermocouple, a gas ignition needle and a silicon nitride ignition head, four through holes are uniformly distributed on the alundum tube, and the thermocouple is arranged in the silicon nitride ignition head. Two wires of the thermocouple, the fuel gas ignition needle and the silicon nitride ignition head are respectively inserted into four through holes of the alundum tube and fixed, the silicon nitride ignition head and the fuel gas ignition needle are on the same horizontal plane, a temperature sensing point of the thermocouple is 5 mm above the fuel gas ignition needle, and combustible gas is guided into the tail end of the fuel gas ignition needle through a gas guide tube. An electromagnetic valve and a fine adjustment needle valve are connected to the gas guide pipe in series, the silicon nitride ignition head is connected into a direct-current power source and connected with a normally-open relay in series, and the electromagnetic valve, the normally-open relay and the thermocouple are all electrically connected with the control system. According to the utility model, gas ignition and electronic ignition can be automatically and freely switched, and the flame size and the electronic ignition aging degree can be detected.

The invention relates to the technical field of a system for analyzing components in electronic gas disilane, in particular to a system for analyzing impurity components in electronic gas disilane. Comprising a first switching valve, a second switching valve communicated with the first switching valve, a third switching valve communicated with the first switching valve and the second switching valve, a first quantitative loop communicated with the first switching valve, a second quantitative loop communicated with the second switching valve and a first carrier gas arranged on the first switching valve, a second carrier gas and sample inlet; and the first switching valve, the second switching valve and the third switching valve are respectively communicated with a first needle valve, a second needle valve and a third needle valve. Therefore, the system for analyzing the impurity components in the electronic gas disilane can solve the technical problems of insufficient separation degree and low qualitative and quantitative accuracy in the prior art.

The utility model relates to the technical field of hot nozzles of hot runners, in particular to a multi-head needle valve hot nozzle of a hot runner, which comprises a multi-head needle valve hot nozzle body and a plurality of movable valve cores, a support table and a fixed table are arranged at the top of the multi-head needle valve hot nozzle body, the fixed table is positioned above the support table, and the movable valve cores are arranged on the support table. A plurality of driving rods are slidably connected to the supporting table, driving shafts are fixedly connected to the bottoms of the driving rods, the bottoms of the driving shafts are fixedly connected with the valve element and used for driving the valve element to move, magnetic rings are fixedly connected to the tops of the driving rods, and a supporting circular ring capable of moving up and down is arranged at the top of the supporting table; by arranging the motor and the micro electric telescopic rod, the lifting circular ring can be driven by the motor to move up and down, the lifting circular ring drives all the valve elements to move synchronously, the micro electric telescopic rod can be independently controlled, and the movement of each valve element is independently controlled by electrifying the electromagnet and adsorbing the magnetic ring.

The invention relates to the technical field of hydrogen circulation components in a fuel cell system, and discloses an ejector structure capable of driving variable nozzle opening by utilizing fluid dynamic pressure, which comprises a shell, a cavity channel of the shell extends to one end to form a gas inlet and extends to the other end to form a gas outlet, and a gas suction port communicated with the cavity channel of the shell is formed in the side part of the shell; a nozzle is installed at the end, away from the air outlet, in the shell, one end of the nozzle extends into the shell to form a spout, the other end of the nozzle extends out of the shell to serve as an air inlet, and a valve body is installed in the nozzle; a gap is formed between the valve body and the nozzle for gas circulation, the valve body comprises a needle valve, and the needle valve can be driven by fluid dynamic pressure to generate displacement in the direction away from the nozzle. According to the ejector structure disclosed by the invention, self-adaptive nozzle opening adjustment can be realized, the hydrogen circulation efficiency and the system response speed are improved, the energy consumption and the maintenance cost are reduced, and the system reliability and the environmental adaptability are improved.

This invention relates to a system flow path for solid-phase extraction and its application method. The system flow path is characterized by a pump inlet port located below a rotary valve, several solvent inlet ports on the circumference of the rotary valve, a solvent outlet port and a waste liquid port on the circumference of the rotary valve, a gas path system connecting the solvent outlet port of the rotary valve to the solvent interface of the sample loader, and a sample loader comprising a valve core and a valve body. The top of the valve body is connected to a sample vial, and a spray needle is also located at the top of the valve body. The valve core is located within the valve body. The sample flow channel is connected to a guide tube, and a membrane adapter is located below the guide tube. The membrane adapter is connected to a collection docking point, which is connected to a dehydration device and a collection vial. The collection docking point is also connected to a flow path switching system. This invention features a compact structure, anti-clogging and anti-cross-contamination advantages, and spray cleaning of the sample vial ensures complete sample loading, improving experimental recovery rates. The online filtration and dehydration functions enable full-process automation.

This invention provides an electric valve and a refrigeration cycle system. The electric valve has a two-stage flow control domain. The main valve port of the main valve seat is fully closed by the main valve core, and the refrigerant flow is controlled in the small flow control domain by the throttling section formed between the auxiliary valve port and the needle valve formed by the main valve core. For this electric valve, vibration of the main valve core in the small flow control domain is prevented, and the controllability in the small flow domain is improved. The main valve port (13a) is fully closed by the main valve core (3), and fluid flows through the throttling section (gap) between the needle part (42) of the needle valve (4) and the auxiliary valve port (33a), thus forming a small flow control domain. In the small flow control domain, the conical part (41a) (abutment part) of the needle valve (4) (auxiliary valve core) abuts against the stepped part (3a) (abutment part) of the main valve core (3). By abutting the tapered part (41a) and the stepped part (3a), the needle valve (4) pushes the main valve core (3) to the side of the main valve seat (13).

A hot runner injection nozzle system for use in co-injection molding with a built-in obturator valve (7) in a nozzle tip assembly (16) attached to a nozzle body (1) and permits several different directions of gating. It allows for independent flow of each melt stream having their confluence at the very last possible position avoiding mutual contamination with the built-in obturator (7). The nozzle tip assembly comprises several channels providing for the flow of multiple polymeric melt streams and an obturator that serves as a check valve. Selective flow of each stream is fully controlled by individual injection units at the source providing the feed for each melt stream. The invention allows for simple fabrication, maintenance, reduces mutual contamination and allows for a more compact hot runner manifold and tool design. It allows for an optional needle-valve when the product requires a better injection point finish.

The utility model relates to the field of hydrogen storage and distribution, in particular to a hydrogen single-path skid-mounted frame which comprises a frame body, a main pipeline, a rear end pipeline and an emptying pipeline are installed on the frame body, and a stop valve, a needle valve, a first pressure gauge and a first-stage pressure reducing valve are sequentially installed on the main pipeline. The rear-end pipeline is connected with the first-stage pressure reducing valve, a second-stage pressure reducing valve, a ball valve, a pressure release valve, a flow control meter and a second pressure gauge are sequentially installed on the rear-end pipeline, the main pipeline and the rear-end pipeline are both connected with an emptying pipeline, and a one-way valve is installed on the emptying pipeline; an inlet of the main pipeline and an outlet of the rear-end pipeline are connected with purging pipelines; and angle valves are mounted on the purging pipelines. A nitrogen purging pipeline is additionally arranged, the cleanliness of gas in the pipeline can be kept, meanwhile, a pressure release valve is arranged, the first-stage pressure reducing valve and the second-stage pressure reducing valve can be prevented from being damaged, rear end valves can be prevented from being damaged by high-pressure gas, the gas can be exhausted into the atmosphere in time, and safety is enhanced.

The invention aims to provide a single needle valve type high-response methanol-diesel injector based on opposed electromagnetic valve control, and belongs to the field of engines. Opposite type double-medium channel control assemblies are installed in an ejector connector body, an ejector middle body and an ejector throttling block, a methanol / diesel shared nozzle assembly is installed in a nozzle body, a diesel connector and a methanol connector are installed on the side of the ejector connector body, a high-pressure diesel channel is arranged in the diesel connector, and a high-pressure methanol channel is arranged in the methanol connector. Free connection and disconnection of an internal high-pressure methanol path and an internal high-pressure diesel path can be controlled, then independent injection of methanol fuel and diesel fuel is achieved, the two fuel injection modes are controlled through the same needle valve, the fuel is injected through the same injection hole, and the advantages of being high in reliability and simple in structure are achieved. And after methanol / diesel oil injection is finished, rapid cut-off of an internal passage of the injector and rapid seating of the needle valve can be achieved, and the response characteristic of fuel injection mode switching of the injector is improved.

The present invention discloses a low-inertia fuel injector for a quick-closing valve, which comprises an injector body (1), an electromagnet component (2), a control valve seat (3), a needle valve body (4), and a needle valve pair (5) installed in the needle valve body; characterized in that: an intermediate valve (6) is arranged between the needle valve pair (5) and the control valve seat (3), and the intermediate valve (6) divides the control chamber B into upper and lower parts, namely a lower control chamber (B1) composed of the intermediate valve (6) and the needle valve sleeve (5b), and an upper control chamber (B2) composed of the control valve seat (3) and the valve seat (6a) of the intermediate valve (6). The fuel injector of this patent application can achieve an injection law of "first slow and then fast". When the solenoid valve is not opened, there is no static fuel leakage. After the solenoid valve is opened, the dynamic fuel leakage is also much smaller than that of the prior art.

A cleaning nozzle and an aluminum foil mill outlet flattening roller cleaning system comprise a shell, an oil inlet pipe connector, an air pipe connector, an air cap, a needle valve and other structures, an independent air cavity and an air supply pipe are matched with a control terminal, the nozzle is linearly installed on a first fixing frame and a second fixing frame, the system scale is flexibly expanded, key components are subjected to wear-resisting treatment, and the service life is prolonged. Meanwhile, sealing design is enhanced, and dismounting and maintenance are convenient. The system accurately controls oil mist composition through a control terminal and an automatic element, the functions of lubrication, cleaning and the like are achieved, and a nozzle does not need to be replaced or an additional device does not need to be used.

The utility model belongs to the technical field of gas detection, and discloses a gas closed sampling device which comprises a medium side valve (1), a flow limiting orifice plate (2), a sampling needle valve (3), a gas-liquid shared quick connector (4), a sampling ball bladder (5), a one-way valve (6) and a torch system valve (7), a medium side valve (1) is arranged at a sampled medium pipeline, a torch system valve (7) is arranged at a torch system, the medium side valve (1) and the torch system valve (7) are connected through a pipeline, a flow limiting orifice plate (2) and a one-way valve (6) are sequentially arranged on the pipeline, and a sampling needle valve (3) is arranged on the pipeline between the flow limiting orifice plate (2) and the one-way valve (6). And the sampling ball bladder (5) is connected with the sampling needle valve (3) through the gas-liquid shared quick connector (4). The device is simple in structure, easy-to-wear parts are reduced, maintenance is convenient, and cost is reduced; the pipeline is thicker than a closed sampler in diameter, so that the pipeline blockage risk is reduced.