318 results about "Intake pressure" patented technology

The present invention discloses a closed-loop EGR flow control system and control method for a natural gas engine. The control system includes: a controller for determining an EGR demand flow rate based on actual engine operating conditions; a controller for obtaining the pressure of an air and gas mixture detected by an intake pressure sensor; or, alternatively, for determining the pressure of an air and gas mixture based on the EGR demand flow rate, a threshold flow rate, the maximum opening of an EGR valve, the actual opening of the EGR valve, the gas flow rate, and the fresh air flow rate; a controller for determining an actual EGR flow rate based on the obtained pressure of the air and gas mixture, the partial pressure of gases in the cylinder, the pressure-to-flow conversion slope, the gas flow rate, and the fresh air flow rate; a controller for determining an EGR flow rate correction value based on the obtained actual EGR flow rate and the EGR demand flow rate; and a controller for adjusting the EGR valve opening based on the EGR flow rate correction value so that the actual EGR flow rate matches the EGR demand flow rate, thereby achieving closed-loop control of the EGR flow rate. The present invention can achieve precise control of the EGR flow rate in two ways.

The embodiment of the invention provides an engine supercharging system and a vehicle, and relates to the technical field of vehicle manufacturing. The electronic supercharger is constructed into a two-stage supercharger, the electronic supercharger is provided with a first-stage compressed air flow channel and a second-stage compressed air flow channel, a turbine compressed air flow channel is formed in the turbocharger, and the first-stage compressed air flow channel, the second-stage compressed air flow channel and the turbine compressed air flow channel are distributed in series. And the three-stage compressed air inlets are communicated with the air inlet to form three-stage compressed air inlet to the air inlet. According to the engine supercharging system provided by the embodiment of the invention, gas can be supercharged for three times through the first-stage compressed air flow channel, the second-stage compressed air flow channel and the turbine compressed air flow channel, so that the air compression ratio can be increased, the turbine hysteresis phenomenon is avoided, the air inlet pressure response speed is increased, and transient air supply to an engine is ensured; the operation stability and combustion efficiency of the engine are guaranteed, the fuel economy of the engine is improved, and the driving experience is improved.

The invention discloses a diaphragm compressor state monitoring method based on dynamic oil pressure and intake and exhaust pressure, and relates to the technical field of diaphragm compressors. The dynamic oil pressure of the compressor is monitored, the running state of the compressor is monitored according to the matching relation between the oil pressure and the air pressure, the fault is recognized in time, and even the fault is pre-judged, so that breakage of a diaphragm or overpressure in a cavity is avoided, and the loss caused by the fault of the compressor is reduced. The method comprises the following steps that S1, the set oil spill pressure of an overflow valve and the air inlet pressure and the exhaust pressure of a compressor are obtained; s2, according to the set oil spilling pressure, air inlet pressure and exhaust pressure, the oil pressure high reference and the oil pressure low reference of the running state of the diaphragm compressor are set; s3, measuring the running dynamic oil pressure of the compressor, and obtaining an oil pressure peak value and an oil pressure minimum value; and S4, the obtained oil pressure peak value and the obtained oil pressure minimum value are compared with the oil pressure high reference and the oil pressure low reference, and the running state of the compressor is judged according to the comparison result.

The invention discloses an automobile engine multi-sensor fault diagnosis system and method, and particularly relates to the technical field of engine multi-sensor fault diagnosis, the automobile engine multi-sensor fault diagnosis system comprises a plurality of sensors, a diagnosis module and a calibration module, the plurality of sensors collect engine operation data and cover air inlet pressure sensors, boost pressure sensors and the like; the diagnosis module diagnoses sensor faults according to preset enabling conditions and logic description, wherein the sensor faults comprise various types of power supply short circuit, ground short circuit and the like; the calibration module sets calibration parameters and verifies and adjusts the parameters in three-high tests and daily calibration. The system and the method can comprehensively diagnose sensor faults, improve diagnosis accuracy and reliability, adapt to different working condition environments, guarantee normal operation of an engine, improve driving experience and stability of an automobile electrical system, and have remarkable practical value.

The invention relates to the technical field of wall-hanging stoves, and discloses an ignition control method and device of a wall-hanging stove, a controller and the wall-hanging stove.The ignition control method comprises the steps that when ignition of the wall-hanging stove fails, the valve opening current of a gas proportional valve of the wall-hanging stove is detected, and when the valve opening current is smaller than a preset current threshold value, the valve opening current is increased, and the wall-hanging stove is controlled to execute ignition operation again; when the valve opening current is larger than or equal to the preset current threshold value, the fan rotating speed of the wall-hanging stove is detected; and when the rotating speed of the fan is larger than the preset rotating speed threshold value, the rotating speed of the fan is adjusted to the preset rotating speed threshold value, and the wall-hanging stove is controlled to execute re-ignition operation. According to the method, the valve opening current is firstly adjusted when the execution of the ignition operation fails, so that the ignition success rate of the wall-hanging stove is increased by increasing the air inlet pressure, and the rotating speed of the fan is adjusted when the valve opening current is greater than the preset current threshold value, so that the ignition failure caused by flame separation and fire transfer failure is avoided by reducing the air inlet amount of cold air; the ignition success rate of the wall-hanging stove is improved.

The present disclosure provides a vehicle leak detection apparatus with automatic intake pressure regulation, comprising: an air pump; a first pipeline configured to allow air pumped by the air pump to be pumped into a test vehicle; a smoke generation unit arranged between the air pump and the test vehicle and configured to generate visible smoke in the air pumped into the test vehicle; and a check valve removably connected to the first pipeline and configured to release air after an air pressure in the first pipeline exceeds an intake pressure that the check valve can withstand so as to automatically regulate the intake pressure during vehicle leak detection.

The invention discloses a hydrogen engine crankcase hydrogen concentration control method, and relates to the field of hydrogen engines, and the method comprises the steps: placing a hydrogen engine on a rack for testing, and obtaining a target hydrogen concentration, an actually measured hydrogen concentration and a crankcase blow-by amount; according to the target hydrogen concentration, the actually measured hydrogen concentration and the crankcase blow-by amount, the target working condition supplementary air amount is calculated; according to the target working condition supplementary air amount, a full-working-condition supplementary air amount database is generated based on the rotating speeds and loads of the different working conditions; obtaining the amount of fresh air needing to be supplemented under the current target working condition according to the full-working-condition air supplementing amount database; the air inlet pressure, the air inlet temperature and the crankcase pressure are obtained; the method comprises the following steps: calculating the opening degree of a throttle valve by combining the air inlet pressure, the air inlet temperature and the crankcase pressure, comparing the hydrogen concentration measured by a hydrogen concentration sensor according to the current target working condition with the target hydrogen concentration to obtain a hydrogen concentration deviation and generate a corrected fresh air amount, and carrying out closed-loop control on the actual crankcase hydrogen concentration by adjusting the opening degree of the throttle valve.

The application discloses a hydrogen engine crankcase hydrogen concentration control method, and relates to the field of hydrogen engines, which comprises the following steps: placing a hydrogen engine on a test bench to test, obtaining a target hydrogen concentration, an actually measured hydrogen concentration and a crankcase blow-by amount; calculating a target working condition supplementary air amount according to the target hydrogen concentration, the actually measured hydrogen concentration and the crankcase blow-by amount; generating a full working condition supplementary air amount database according to the target working condition supplementary air amount, based on the rotating speed and the load of different working conditions; obtaining the fresh air amount required to be supplemented by a current target working condition according to the full working condition supplementary air amount database; obtaining an intake air pressure, an intake air temperature and a crankcase pressure; combining the intake air pressure, the intake air temperature and the crankcase pressure to calculate a throttle opening degree; comparing the hydrogen concentration measured by a hydrogen concentration sensor according to the current target working condition with the target hydrogen concentration to obtain a hydrogen concentration deviation; generating a corrected fresh air amount; and performing closed-loop control on the actual crankcase hydrogen concentration by adjusting the throttle opening degree.

The application discloses a system and method for realizing and improving engine EGR rate, which comprises an ECU of an engine, an exhaust pipe and an air inlet pipe connected to the engine, the exhaust pipe and the air inlet pipe being connected to an EGR valve, and a mixed gas pipe being further connected to the EGR valve, wherein the ECU is provided with a pressure difference obtaining unit capable of obtaining a pressure difference, and the exhaust pipe is further provided with an electrically-controlled supercharging device capable of supercharging exhaust gas in the exhaust pipe. The system for realizing and improving engine EGR rate has the structure, when the obtained pressure difference W is less than or equal to zero, and the set value of the EGR rate under the current working condition in the storage unit is greater than zero, the electrically-controlled supercharging device is started to supercharge the exhaust gas until the actual value of the actual EGR rate is equal to the set value of the EGR rate under the current working condition. The application has the advantages that the intake pressure of the exhaust gas is adjusted in real time to ensure the proportion of the exhaust gas and fresh air, and the EGR rate of the engine and the performance of the engine are ensured in real time.

The utility model relates to a high-integration electronic valve body, which comprises a three-in-one sensor, a valve body and a control unit, the three-in-one sensor detects pressure and temperature information in the valve body through a pressure detection hole and a temperature detection hole, and simultaneously transmits the pressure and temperature information to an engine ECU (Electronic Control Unit); the engine ECU calculates the opening degree of the valve body according to the pressure and temperature information and transmits the opening degree information of the valve body to the driving motor, the driving motor controls the valve shaft to rotate to open the valve plate, and the three-in-one sensor detects the opening angle of the valve plate and feeds back the opening angle to the control unit. Compared with the prior art, the high-integration electronic valve body has the advantages that the arrangement of the air inlet pressure sensor and the temperature sensor is added, the integration level is higher, and the space arrangement and the cost are saved.

To enhance frequency of determination processing related to presence / absence of an abnormality of a supercharging pressure sensor using estimation supercharging pressure.SOLUTION: An abnormality determination device for a supercharging pressure sensor can execute estimation processing (S11-S22) for estimating estimation supercharging pressure that is an estimated value of pressure of intake air in a merging passage on the basis of one of a first intake flow rate that is the amount of intake air flowing in a first passage per unit time and a second intake flow rate that is the amount of intake air flowing in a second passage per unit time. The abnormality determination device can execute determination processing (S31-S42) for determining presence / absence of an abnormality in the supercharging pressure sensor on the basis of the estimation supercharging pressure and measurement supercharging pressure that is a measurement value of the pressure of the intake air in the merging passage. The abnormality determination device estimates estimation supercharging pressure on the basis of the first intake flow rate when the first intake flow rate is the second intake flow rate or greater in the estimation processing, and estimates the estimation supercharging pressure on the basis of the second intake flow rate when the first intake flow rate is smaller than the second intake flow rate.SELECTED DRAWING: Figure 2

To avoid, in an engine system comprising an exhaust gas recirculation device, function failure due to infiltration of condensate water into an intake pipe pressure introduction pipe.SOLUTION: A gas fuel supply device for an engine has a fuel cylinder 1, a regulator 2, an intake passage 5 comprising a throttle 3 and a mixer 4, a fuel pipe 8, an engine 10, and an exhaust gas recirculation device 13 that recirculates part of exhaust gas to the intake passage 5 as EGR gas, the gas fuel supply device comprising an intake pressure outlet formed in the intake passage 5, and a mounting part formed around the intake pressure outlet. The regulator 2 has an intake pressure inlet 30 formed on its outer surface. The regulator 2 is fixed to the mounting part by a fixing member in a state where the intake pressure outlet and the intake pressure inlet 30 are in direct and airtight communication.SELECTED DRAWING: Figure 1

The invention discloses a control method, device and system for a diesel engine supercharger. The control method comprises the following steps that current state data of a diesel engine are obtained; according to the rotating speed of the engine and the fuel injection quantity, the current intake manifold required pressure is determined in a table look-up MAP mode; determining a correction coefficient according to the altitude; determining a demand pressure value according to the correction coefficient and the current intake manifold demand pressure; and the real-time air inlet pressure of the air inlet manifold is obtained, and the opening degree of the electronic throttle valve is controlled according to the required pressure value till the real-time air inlet pressure of the air inlet manifold is equal to the required pressure value. According to the method, the engine rotating speed, the oil injection quantity and the corresponding optimal required pressure are determined through the bench test when the real-time rotating speed of the supercharger is equal to the supercharger rotating speed limit value, the current required pressure of the intake manifold can be determined through table look-up in actual operation, and it is guaranteed that the supercharger does not overspeed; and the problem of engine power loss caused by fuel injection quantity reduction is avoided.

The invention discloses a dynamic gas supplementing method, system and equipment for a hydrogen engine and a medium, and relates to the technical field of engine control, the method comprises the steps that the current working condition and the current required gas inflow of the engine are obtained based on the current operation parameters of the engine so as to be matched with a gas supplementing gas source corresponding to the current working condition; the current actual air inflow of the engine is measured, and the difference value between the current required air inflow and the current actual air inflow is calculated; and on the basis of the difference value, the compensation gas amount is calculated through a preset flow compensation algorithm, and a gas supply gas source corresponding to the current working condition is adopted to supply gas to the engine intake manifold with the compensation gas amount. According to the method, the working condition of the engine is recognized, the corresponding air source is matched, meanwhile, the air inlet deviation can be continuously corrected through the preset flow compensation algorithm based on the difference value between the demand and the actual air inlet amount, air inlet pressure fluctuation caused by system delay or disturbance is effectively restrained, and therefore the engine is accurately controlled.

The invention discloses a thermodynamic test bench with pressure large amplitude transient regulation, and belongs to the technical field of thermodynamic test equipment, the thermodynamic test bench comprises a thermal test bench, the front and rear sides of a thermal test sleeve are respectively communicated with a gas injection pipe and a material injection pipe, and the thermal test sleeve is provided with a gas injection regulation mechanism for regulating the gas injection pressure and temperature. An exhaust adjusting mechanism is arranged on the thermal test sleeve and used for adjusting exhaust pressure. Through cooperation of the exhaust partition plate and the electric push rod, when the electric push rod rapidly moves the exhaust partition plate, the volume of an exhaust cavity of a combustion chamber can be instantly changed, a sudden pressure drop or rise working condition is created, and pressure transient change in flight of an airspace engine is accurately simulated, and through cooperation of an air pressure monitoring plug and a compression spring, when the air inlet pressure is lower than a threshold value, the air pressure can be monitored. And the pre-tightening force of the compression spring is adjusted through the hydraulic push rod, so that the minimum air inlet pressure threshold value can be flexibly set, and different test scenes of the airspace engine can be adapted.

The application discloses a kind of gas engine active precombustion chamber lean combustion comprehensive system and control method, belong to gas engine technical field.The system includes main combustion gas inlet pipeline, active gas inlet pipeline, active precombustion chamber and ECU.Active gas inlet pipeline is equipped with active gas inlet electric pressure regulating valve, active gas inlet total gas metering valve, each cylinder precombustion chamber entrance is equipped with active gas inlet single cylinder gas metering valve.ECU and gas inlet manifold pressure sensor and electric pressure regulating valve form closed loop pressure regulating unit, maintain the positive pressure difference between precombustion chamber and main combustion chamber;ECU and total metering valve, single cylinder metering valve, single cylinder exhaust temperature sensor form metering control unit, realize total air intake and single cylinder air intake independent closed loop regulation.The application controls precombustion chamber air intake pressure and each cylinder gas quantity accurately, combines the intercylinder balance control based on exhaust temperature, significantly improves the stability and uniformity of multi-cylinder gas engine lean combustion, effectively improves thermal efficiency.

The utility model discloses a hydraulic station which comprises an air cylinder, a reversing trigger device capable of sending out a signal that an air cylinder piston of the air cylinder moves in place, a reversing valve for switching air intake and air exhaust of two air cylinder cavities of the air cylinder according to the signal of the reversing trigger device, and an oil cylinder linked with the air cylinder, the oil cylinder can extract hydraulic oil from the oil tank under driving of the air cylinder and supply the hydraulic oil to the executing mechanism through the first oil supply pipeline. The hydraulic oil pump extracts hydraulic oil from the oil tank and supplies the hydraulic oil to the executing mechanism through a second oil supply pipeline, and the pressure detection device is used for detecting the air inlet pressure of the reversing valve or the oil pressure of the oil outlet of the oil cylinder. The first oil supply pipeline is provided with a first one-way valve to prevent hydraulic oil in the second oil supply pipeline from entering the first oil supply pipeline. The hydraulic oil pump is started when the pressure detection device detects that the air inlet pressure or the oil pressure is reduced to a first set value. According to the hydraulic station, the hydraulic oil pump is used for supplying oil when oil supply of the oil cylinder is stopped, and therefore continuous oil supply is achieved.

The invention provides a bearing box airtight chamber oil shield, which comprises an oil shield main body and an air baffle plate which are fixed by bolts and sleeved on a crankshaft, annular sealing teeth are fixed on the inner side of the oil shield main body, and the oil shield main body is fixed on a bearing box body. In addition, an annular sealing cavity is formed in the oil shield body, and two annular partition plates are symmetrically fixed in the annular sealing cavity. An air inlet is formed in one side of the annular sealing cavity, an air guide hole in the air baffle is communicated with the air inlet and connected with an air inlet pipe, and the air inlet pipe is connected with an external compressed air source. The oil shield has the advantages that the annular sealing cavity is formed in the oil shield body, compressed air of the air inlet pipe is introduced, bidirectional airflow is formed through the inner and outer air guide grooves, and lubricating oil leakage and impurity invasion are prevented. Compressed air is evenly distributed in a millimeter-level radial gap between the two annular partition plates, the pressure of an air ring is super-atmospheric pressure, and the sealing performance is improved. The regulating valve and the filtering pressure reducing valve jointly precisely regulate and control air inlet pressure, the valve opening degree is regulated according to the running condition of the turbine, oil throwing of the bearing box is prevented, and long-term stable and reliable running of equipment is guaranteed.

The invention discloses a vehicle and a fuel gas injection control method and device of a fuel gas injection system of the vehicle. The control method comprises the steps that the operation working condition of the vehicle gas injection system is obtained in real time; the operation working conditions at least comprise the operation state and the rotating speed of the engine, the temperature of engine cooling liquid, the gas inlet pressure and the gas inlet temperature at the inlet of the gas inlet pipeline, and the gas pressure and the gas temperature at the inlet of the gas ejector; the mass of pre-injected fuel gas is determined according to the current operation working condition of the vehicle fuel gas injection system; the opening degree and the opening time of a gas injector are determined, and the gas injector is controlled to conduct gas pre-injection according to the opening degree and the opening time; after fuel gas pre-injection is finished, according to the current operation working condition, the reinjection fuel gas quality is determined; and the opening degree of the fuel gas injector is determined, and the fuel gas injector is controlled to conduct fuel gas supplementary injection according to the opening degree until it is determined that the current operation state is in the timing synchronization state. The starting speed and the starting stability of the engine are improved.

The application relates to a supercharger control method, system, device, computer equipment and computer readable storage medium. The method comprises the following steps: obtaining the intake pressure of an engine; determining whether the size of the intake pressure in a set time period meets a first preset condition; determining whether the rising speed of the intake pressure in the set time period meets a second preset condition; in the case that the size of the intake pressure in the set time period meets the first preset condition and the rising speed of the intake pressure in the set time period meets the second preset condition, controlling the opening degree of the nozzle of the supercharger to be a first opening degree. The method can predict whether the engine will have a safety problem according to the trend of the intake pressure of the engine, so that the opening degree of the nozzle of the supercharger is controlled in advance, the maximum intake pressure of the engine is limited below a set pressure, the safety of the engine is ensured, and the risk of engine over-regulating explosion pressure is eliminated.

This invention discloses a device and control method for maintaining uniform pressure and temperature in the engine intake chamber. The device includes a circulation pipe, with its two ends fixedly connected to the flywheel end and free end of the intake chamber, respectively. The intake passages of the first and last cylinders are connected to the intake chamber. Temperature and pressure detection devices are installed on both the first and last cylinder intake passages. A regulating valve is installed on the circulation pipe to adjust the flow rate of the boosted intercooled air in the circulation pipe. The detection devices are connected to the ECU, and the regulating valve is controlled by the ECU. The regulating valve is configured as an electronic throttle. The ECU monitors the intake pressure and temperature signals of each cylinder in real time, obtains a preset electronic throttle opening angle based on the temperature and pressure differences, and controls the opening angle of the electronic throttle according to the preset angle. This precisely controls and adjusts the flow rate of the boosted intercooled air in the circulation pipe, ensuring uniform intake pressure and temperature in each cylinder, improving engine knock pressure uniformity, exhaust temperature uniformity, and reducing vibration.

The throttle device of the present application can reduce the occupied space in the axial direction of the throttle valve to achieve compact engine. The throttle device includes: a throttle device body, which supports the throttle valve in the throttle hole through the throttle valve shaft, and protrudes the throttle valve shaft on the outer side; a cover member, which divides the mechanism room containing the transmission mechanism with the outer side of the throttle device body; a motor, which is installed on the throttle device body, the rotation of the output shaft protruding into the mechanism room is transmitted to the throttle valve shaft through the transmission mechanism, and the amount of intake air flowing in the throttle hole is adjusted according to the opening and closing of the throttle valve; a throttle opening degree sensor, which is provided on the cover member and detects the rotation angle of the throttle valve shaft; and at least any one of an intake air temperature sensor and an intake air pressure sensor, the intake air temperature sensor is provided on the cover member and detects the temperature of the intake air, and the intake air pressure sensor is provided on the cover member and detects the pressure of the intake air.

The application provides a method, device, storage medium and electronic equipment for maintaining an air filter. The method comprises: obtaining an air intake pressure of the air filter, wherein the air intake pressure is obtained by a pressure sensor installed at an air intake port of the air filter; determining an oil consumption degradation coefficient corresponding to the air filter according to the air intake pressure, wherein the oil consumption degradation coefficient reflects a difference between an actual oil consumption and a theoretical oil consumption; determining an oil consumption degradation amount according to the oil consumption degradation coefficient and the actual oil consumption, and determining an oil consumption degradation cost according to the oil consumption degradation amount; and generating a prompt information in a case where the oil consumption degradation cost is higher than a maintenance cost of the air filter, wherein the prompt information is used to prompt a user to maintain the air filter in time. The present scheme realizes timely maintenance of the air filter.

The invention belongs to the technical field of coal bed gas treatment. According to the coal bed gas compressor control system, the control method and the coal bed gas dust removal and pressurization system, it is guaranteed that a compressor unit can operate safely, efficiently and stably, and the whole coal bed dust removal, compression and dehydration system operates stably. According to the technical scheme, the coal bed gas compressor control system comprises a compressor, an electric control pneumatic switch ball valve and an air inlet pressure sensor are sequentially arranged on an air inlet pipeline of the compressor, an exhaust pressure sensor is arranged on an air outlet pipeline of the compressor, and a backflow adjusting valve, a backflow switch valve and a backflow manual valve are arranged on a backflow pipeline in parallel. In addition, structures for sewage discharge pressure detection, high-level oil tank automatic oil supplement, cooling water amount automatic control and the like are additionally arranged, a control system and a control method of the compressor are perfected, the operation fault condition of the compressor unit can be found in time, an alarm is given out, and it is guaranteed that the compressor unit can operate safely, efficiently and stably.

A lean-burn engine pressurization control method. An exhaust control valve (170) is provided at a turbine (142) end of a turbocharger (140). The method comprises: acquiring a required intake pressure of an engine (S1); when the required intake pressure is higher than a basic boost pressure, acquiring an actual intake pressure of the engine (S2-S3), the basic boost pressure being a boost pressure of the engine when the exhaust control valve is fully open; and, on the basis of the required intake pressure and the actual intake pressure, controlling the degree of opening of the exhaust control valve (S4). Further provided are a computer device (300), a computer-readable storage medium, a computer program product, a lean-burn engine pressurization control system (100), and a vehicle.

METHOD FOR MEASURING A COMPRESSION RATIO OF AN ENGINE CYLINDER OF A VEHICLE AND APPLYING A CORRECTION TO A COMBUSTION PROCESS The invention relates to a method (100) comprising the steps of: Determining (105) an intake pressure in an intake of a combustion chamber; Determining (106) as a function of said intake pressure, a value representative of a nominal compression torque (CPTnom); Determining (107, 108) instantaneous rotation speeds of a crankshaft close to a bottom dead center of an intake phase and a top dead center of combustion; Determining (109) a value representative of an actual compression torque (CPTreal) as a function of said instantaneous rotation speeds; Determining (110) a ratio (R) equal to said value representative of the actual compression torque (CPTreal) / value representative of the nominal torque compression (CPTnom);If the said ratio (R) is outside an interval, apply 111 a correction to the combustion process. Figure to be published with the abstract: Figure 1;

This invention discloses a flow diversion device and a helicopter that enhances helicopter performance by utilizing the coupling of internal and external flow fields. The flow diversion device includes a sliding support frame, a grooved stabilizing wing assembly, and a helical crossflow fan. The sliding support frame is disposed within the helicopter's fuselage and is slidably extendable to drive the grooved stabilizing wing assembly and the helical crossflow fan to extend through the mounting port and approach the air intake. The upper end of the grooved stabilizing wing assembly is recessed to form a mounting groove. The helical crossflow fan is rotatably mounted within the mounting groove and rotates under the action of the rotor downwash generated during helicopter rotor rotation. This rotation draws the rotor downwash and forward or side-flight turbulence into the mounting groove to form an accelerated airflow, which is then accelerated and discharged from the mounting groove before entering the air intake. This flow diversion device increases the intake volume and pressure of the engine, reduces most of the engine power loss caused by the coupling of internal and external flow fields, and improves engine output power.

To provide a ventilation fan that can prevent a reversed flow of air into a sub-suction duct from a sub-suction port at the time of stopping a ventilation fan.SOLUTION: A ventilation fan 100 includes: a ventilation fan body 1 in which a main suction port 1e, a sub-suction port 1f, and an exhaust port 1g are formed; a fan 2 for generating an air flow that is oriented toward the exhaust port 1g from the main suction port 1e and the sub-suction port 1f; a cylindrical exhaust side duct connection part 3 detachably fitted to the ventilation fan body 1 to communicate between an exhaust side duct 10 and the exhaust port 1g; and a cylindrical sub-suction side duct connection part 5 detachably fitted to the ventilation fan body 1 to communicate between a sub-suction side duct 11 and the sub-suction port 1f. A sub-suction side shutter 6 capable of opening and closing is installed inside the sub-suction side duct connection part 5. The sub-suction side shutter 6 opens with intake pressure of an air flow generated by the fan 2 when the ventilation fan 100 operates to allow communication between the sub-suction side duct 11 and the sub-suction port 1f and closes with self-weight when the ventilation fan 100 stops to block communication between the sub-suction side duct 11 and the sub-suction port 1f.SELECTED DRAWING: Figure 2

The utility model discloses an annealing device for motor stator silicon steel sheet production, including annealing furnace body, the back surface fixed mounting of annealing furnace body has the nitrogen cylinder, the gas -out end fixed communication of nitrogen cylinder has the intake pipe, the one end of intake pipe is away from nitrogen cylinder and extends to the inside of annealing furnace body and is passed through annealing furnace body. The device can extract the gas in the annealing furnace body through the setting of high temperature -resistant centrifugal fan, and the cooperation with the air extraction pipe and the exhaust pipe, and then can send the gas back to the annealing furnace body, realize the circulation flow of the gas in the annealing furnace body, ensure that the silicon steel sheet is heated evenly, utilize the setting of nitrogen cylinder, and the cooperation of intake pipe, pressure valve and rotor flowmeter, so that nitrogen can enter the annealing furnace body, and the intake pressure is adjusted and the intake flow is monitored, the air in the annealing furnace body is replaced by nitrogen, the annealing environment without oxygen is formed, and the oxidation condition of silicon steel sheet is prevented.

The present application relates to a kind of anti-explosion diesel engine smoke control system and method, system includes: data acquisition unit, for the rotating speed data of anti-explosion diesel engine, intake pressure data, cooling water temperature data, intake temperature data and atmospheric pressure data;Data processing unit is used to calculate the intake flow data of anti-explosion diesel engine according to rotating speed data, intake pressure data and intake temperature data, stroke intake volume and air-fuel ratio limit;According to rotating speed data, stroke intake volume and air-fuel ratio limit, calculate smoke limit oil quantity;According to smoke limit oil quantity, calculate the injection pulse width of anti-explosion diesel engine;Injection control unit is used to output valve control signal according to injection pulse width;Injection control valve is used to change the opening and closing state of itself under the control of valve control signal, to control the injection quantity of anti-explosion diesel engine;The present application can effectively prevent anti-explosion diesel engine from appearing smoke phenomenon.