203 results about "Reflux valve" patented technology

The invention relates to the technical field of fluid control equipment, and discloses an anti-backflow valve which comprises a valve body, a valve rod, a sealing valve seat and a valve plate, an output pipe is arranged on the outer wall of the right side of the valve body, an input pipe is arranged at the bottom of the valve body, the sealing valve seat is fixedly installed in the input pipe, and the valve plate is pressed on the sealing valve seat. The valve rod is rotated to drive the connecting disc to rise, the spring drags the valve plate to rise, the valve plate is separated from the sealing valve seat, the inserting rod is arranged, on one hand, the valve plate is guided, on the other hand, when the valve needs to be closed, the valve rod can drive the inserting rod to move downwards, and then the valve plate is tightly pressed on the sealing valve seat; if the water pressure in the input pipe is lower than the water pressure in the valve cavity of the valve body, the pressure acting on the upper surface of the valve plate can downwards press the valve plate at the moment, then the valve plate is pressed on the sealing valve seat, the valve is closed, and then the backflow problem is avoided.

The invention relates to the technical field of compressors, in particular to a series-connection automobile towing compressor system and an automatic surge control method. The series-connection automobile towing compressor system comprises a plurality of stages of automobile towing compressors, a plurality of temperature reduction devices, a bypass return valve, a plurality of temperature reduction adjusting valves and a plurality of orifice plate flowmeters. The problems that in the prior art, cost is high, energy consumption is large and the control effect is not ideal are effectively solved, the multiple stages of automobile dragging compressors are arranged in series and matched with the temperature reducing device and the bypass backflow valve, effective circulation and temperature control of media are achieved, cost of independently using a surge backflow valve in the prior art is reduced, and meanwhile the control effect is good. Through the arrangement of the vortex shedding flowmeter, the pressure sensor, the temperature sensor and the rotating speed sensor, the inlet flow, pressure, temperature and rotating speed of each stage of compressor are accurately measured, in combination with theoretical surge pressure ratio calculation, the surge risk is pre-judged in advance and automatically controlled, and energy consumption increase caused by premature intervention of a bypass return valve at the low rotating speed is avoided.

The invention relates to the field of motorcycle braking systems, and discloses a motor-free motorcycle ABS system and a control method, the motor-free motorcycle ABS system comprises a negative pressure generation unit, a hand brake unit and a return valve; the system further comprises a pressure increasing valve, a pressure reducing valve, an energy accumulator and a braking unit. The hand brake unit is connected with the negative pressure generation unit, the hand brake unit comprises a main cylinder, the main cylinder provides high-pressure brake fluid for an ABS system, the main cylinder is connected with two oil ways, one oil way is communicated with an energy accumulator, the other oil way is communicated with the brake unit through a pressure increasing valve, and the other end of the negative pressure generation unit is connected with a return valve; the reflux valve is connected with the reducing valve; the pressure reducing valve and the pressure increasing valve are connected in parallel and then connected with the brake unit; the energy accumulator is connected between the hand brake unit and the pressure increasing valve through the one-way valve, and the energy accumulator is connected with the return valve and the pressure reducing valve. The brake system has the advantages of low cost, reliability in use and the like.

The invention discloses a low-temperature upper-stage power system, and relates to the field of spaceflight. Comprising a gas cylinder, a pressure supplementing electromagnetic valve, a pressure supplementing pore plate, a self-generation pressurizing electromagnetic valve, a self-generation pressurizing pore plate, a storage tank, an overflow valve, a storage tank pressure sensor, a pressure stabilizing valve, a circulating pump, a circulating control valve, a pump front valve, a Joule-Thomson throttling expansion valve, a heat exchanger and a branch supply control valve; the main engine subsystem comprises a pump, a turbine, an auxiliary valve, a fuel gas generator, a main valve, a precooling backflow valve, a main thrust chamber, an evaporator, a starting gas cylinder, a starting gas cylinder control valve, a main thrust chamber igniter and a fuel gas generator igniter. The attitude control engine subsystem comprises a plurality of attitude control engines; each attitude control engine comprises an attitude control thrust chamber, and an oxidant control valve, a fuel control valve and an attitude control thrust chamber igniter are arranged on each attitude control thrust chamber. Propellant supply of the main engine and the attitude control engine is achieved through the unified pressurization conveying system.

A vertical pipeline shield pump comprises a vertically-installed pump body, the pump body is connected to a vertical pipeline in series through a suction cover and an outlet cover, a motor stator, a motor rotor and a pump impeller are arranged in the pump body, the motor stator isolates a stator winding and a conveying medium through a stator shielding sleeve, and the motor rotor and the pump impeller are coaxially connected through a pump shaft. The pump is provided with a main circulation loop and an auxiliary circulation loop, a medium in the main circulation loop enters through a suction cover, enters a motor outer shell to absorb heat after being pressurized by a pump impeller and guided by a guide vane in sequence, and then is conveyed to a rear pipeline through an outlet cover; in the auxiliary circulation loop, a pump impeller outlet diversion medium enters a pump rear rotor cavity through a front bearing body circulation hole, circulates along the inner wall of a stator shielding sleeve after being pressurized by an auxiliary impeller and is converged into main circulation. The motor outer shell is of a three-layer structure, the middle layer and the outermost layer are connected through a rib plate, a pump shaft penetrates through a rear bearing body and other components to achieve stable supporting, meanwhile, a power sealing assembly and a safety backflow valve are arranged, and efficient, stable and leakage-free operation of the pump is guaranteed.

The invention relates to the technical field of chemical production automatic control, in particular to a hexachlorodisilane automatic production control system and method. Data are corrected through the temperature compensation model, side reaction caused by inaccurate temperature is avoided, the temperature and pressure of the reaction kettle are adjusted through negative feedback of the self-adaptive temperature and pressure control model, a gain function is dynamically adjusted according to the reaction time, and the control precision is improved; on the basis of online component analysis, a mathematical regression analysis model is established, coefficients are determined through machine learning, and a production parameter optimization module is used for calculating the opening degree of a return valve and optimizing parameters of a rectifying tower so as to reduce by-products and guarantee the quality of hexachlorodisilane; according to a data analysis result, automatic safety inspection is automatically carried out, the explosion risk is quantitatively evaluated, leakage is detected and speculated through a leakage positioning algorithm, graded protection signals are matched, safety measures are executed, and production safety is guaranteed.

A compressor unit includes a first spillback valve, an adjusting means that adjusts a processing amount of hydrogen gas by a succeeding compression stage, an upstream side temperature sensor, and a controller. The controller refers to suction temperature acquired by the upstream side temperature sensor, and can execute a first control and a second control, the first control being of controlling the first spillback valve so that suction temperature falls within a predetermined temperature range, and the second control being of controlling the adjusting means so that a processing amount of the succeeding compression stage is adjusted according to a change amount in pressure in an intermediate flow path caused by the first control. The predetermined temperature range is set to a range higher than reference temperature based on liquefaction temperature of air and less than 0°C.

The utility model belongs to the technical field of coating machines, and discloses a coating device. The coating device comprises a coating die head, a slurry pipe, a coating valve and a return valve which are communicated in sequence, slurry can flow out of an outlet of the coating die head through the return valve, the coating valve, the slurry pipe and the coating die head in sequence, the return valve can enable part of the slurry to flow back to the return valve, and the coating device further comprises a back suction valve mechanism. The back-suction valve mechanism comprises a back-suction pipe and a back-suction valve assembly, the back-suction pipe is communicated with the slurry pipe, the back-suction valve assembly comprises a back-suction driving part and a sealing assembly, the back-suction pipe is filled with the sealing assembly in a sealed mode, and the back-suction driving part can drive the sealing assembly to reciprocate along the back-suction pipe. According to the coating device, the slurry absorption effect is obvious, and then the situation that slurry overflows from the coating die head during the coating interval is avoided.

The utility model discloses a steam condensate water buffer water storage system in the technical field of condensate water storage, which comprises a collecting tank and a buffer tank which are closed storage tanks, the collecting tank and the buffer tank are communicated through a buffer valve, a return valve is additionally arranged to reversely communicate the collecting tank and the buffer tank, and a liquid level meter is arranged to monitor the water level. According to the pipe network system, condensate water can be automatically adjusted and buffered, extreme fluctuation of the liquid level of the condensate water collecting tank can be avoided, when the liquid level of the condensate water collecting tank is low, water is supplemented in time, and when the liquid level in the condensate water collecting tank is high, redundant water in the condensate water collecting tank is temporarily stored through the buffering tank; and enough space is provided for the collecting tank, upstream condensate water can be conveniently collected, the situation that the upstream condensate water is detained is avoided, abnormal production conditions are effectively avoided, and the stability of the water amount in the collecting tank can be further improved.

The application provides a single-inclined anti-backflow valve grouting sleeve combined device, and belongs to the field of precast concrete members. The device solves the problem of incomplete grouting and affected connection strength caused by the easy backflow of grouting material in the internal grouting sleeve. The device comprises a grouting sleeve, a reinforcing bar and a single-inclined anti-backflow valve. The single-inclined anti-backflow valve comprises a fixed base, a single-inclined disc, an upper shaft and a lower shaft. The fixed base is a circular ring structure. The upper shaft and the lower shaft are both arc structures and are fixed inside the fixed base. The upper shaft and the lower shaft are oppositely arranged and have a space overlap. A gap is arranged between the upper shaft and the lower shaft for the single-inclined disc to pass through and move. The single-inclined disc is a disc structure with a cylindrical groove in the center, which is recessed towards the direction of the grouting inlet. The single-inclined disc passes through the gap between the upper shaft and the lower shaft. Two upper limiting shafts limit the upward turning angle of the single-inclined disc. Two lower limiting shafts limit the downward turning angle of the single-inclined disc. The application effectively promotes complete grouting.

The invention relates to methods and devices for blow molding containers. A preform is thermally conditioned and then transformed into the container within a blow mold by the application of blowing pressure. The blowing gas is introduced into the preform in at least two pressure stages via compressed air lines assigned to each pressure stage. A blowing air valve controlling the injection is arranged in each of the compressed air lines. At least the blowing gas of the highest pressure stage is supplied from an external compressed gas source. After container forming, at least a portion of the used blowing air is released to ambient pressure via a relief line controlled by a relief valve.For the purpose of reuse, at least a further portion of the used compressed air is routed via a return line controlled by a return valve to a first compressed gas reservoir, and the stored compressed gas is used for a subsequent forming process. A directional control valve is arranged in the return line between the return valve and the first compressed gas reservoir. This valve has at least two outlets and at least one inlet and connects the return line on its outlet side to the first compressed gas reservoir or to another, second compressed gas reservoir that stores compressed gas at a pressure different from that of the first compressed gas reservoir.

The application discloses a single-drive multi-effect linkage type rural domestic sewage treatment device and method, and belongs to the field of rural sewage treatment. The device comprises a device cavity, a mixing chamber, a filtrate chamber, a multi-directional cooperation stirring mechanism and a linkage stirring mechanism, a differential pressure driven one-way backflow valve is arranged between the mixing chamber and the filtrate chamber, a recirculation pump, a pumping pipeline and a distribution nozzle are arranged in the mixing chamber, and a filter dish with a fabric filter is arranged below. The single-drive motor is used for driving the filter dish to reciprocating rotate and the stirring paddle of the filtrate chamber to reciprocating stir through bevel gears, chain wheels and gear strips. After the sewage is pretreated in a septic tank, the sewage enters the mixing chamber, is filtered by the fabric filter through intermittent spraying at a small flow rate, and is automatically and fully backflowed and recycled for purification at a low flow rate period, and is discharged after reaching the standard. The device has the advantages of simple structure, low energy consumption, convenient maintenance, adaptation to the characteristics of large fluctuation of rural sewage, high treatment efficiency, stable operation, and suitability for popularization and use in rural areas.

The utility model discloses an automatic T-shaped product anti-reflux valve performance test frame, which comprises a test frame, a cylinder frame is fixedly arranged at the center position of the top of the test frame, a pressing cylinder is fixedly arranged on one side of the cylinder frame, a rear cylinder fixedly arranged at the top of the test frame is arranged on the rear side of the cylinder frame, and a pressing cylinder is fixedly arranged on the other side of the cylinder frame. Side cylinders fixedly mounted at the top of the test frame are arranged on two sides of the cylinder frame; a lower pressing plate is fixedly installed at the output end of the lower pressing air cylinder, a rear baffle is fixedly installed at the output end of the rear air cylinder, side baffles are fixedly installed at the output ends of the side air cylinders, and products to be tested are arranged among the lower pressing plate, the rear baffle and the two side baffles. According to the utility model, the product to be tested can be conveniently limited and fixed, the channel of the T-shaped product to be tested can be conveniently positioned and sealed, the test accuracy is improved, the automation degree is high, the operation is simple, the situation that the performance of the damaged anti-reflux valve cannot be found in manual assembly is avoided, and the unqualified product is prevented from reaching the hand of a terminal user.

The utility model discloses a special maintenance tool for a liquid oxygen return valve, which comprises a gear box, the top of the gear box is provided with a box cover, the bottom of the inner wall of the gear box is movably connected with a first transmission wheel through a rotating shaft, the top of the first transmission wheel is provided with a rotating groove, and the right side of the first transmission wheel is meshed with a second transmission wheel; the bottom of the second transmission wheel is movably connected with the bottom of the inner wall of the gearbox through a rotating shaft, the top of the second transmission wheel is fixedly connected with a first torque wheel, the right side of the first torque wheel is meshed with a second torque wheel, and a sleeve rod is fixedly connected into the second torque wheel. By means of the tool, a fastening bolt in the liquid oxygen throttle valve can be effectively screwed, the phenomenon that a user only operates through a common tool is very labor-consuming is avoided, the practicability of the tool is enhanced, and the phenomenon that the user cannot rapidly fasten the fastening bolt through a maintenance tool is avoided.

The present invention relates to an enteral gravity-feeding system, where the venting mechanism is integrated into the anti-reflux valve.

Method for a supercharged power engine, comprising the following: Differentiate between a deterioration of a compressor return valve (CRV) throttle and a CRV position sensor based on both a throttle inlet pressure and the commanded position of the CRV throttle.

The utility model provides a kind of based on the realization of wine circulation irradiation ripening device of pumping, including wine storage tank, further include: with the wine pump of wine storage tank is connected by pipeline, and the irradiation tank of another end of wine pump is connected by pipeline;Wherein, wine pump is used to pump the wine in wine storage tank to the irradiation tank in ripening area;Irradiation device, irradiation device is used to generate X-ray, and the X-ray generated using irradiation device irradiates ripening area;Irradiation tank is provided with sample inlet, reflux port and wine outlet, and reflux port and wine outlet are respectively connected to wine storage tank by pipeline, and reflux valve is set in the pipeline side close to wine storage tank, and wine outlet and wine storage tank are connected pipeline side close to irradiation tank on the one side of setting wine valve;Wherein, sample inlet is used to make wine enter to irradiation tank, reflux port is used to make wine flow back to wine storage tank, and keep reflux valve for opening state during irradiation, and after irradiation, make the remaining wine in irradiation tank flow back to wine storage tank by opening wine valve through wine outlet.

In an aircraft, a fuel return valve (FRV) controls a flow of fuel, used to cool an oil feeding a propulsion engine and an oil of an integrated drive generator (IDG). A first sensor supplies measurements of the oil temperature at an output port of the IDG and a second sensor supplies measurements of oil temperature of the propulsion engine. An FRV operation monitoring system: determines, for each flight of the aircraft, an oil temperature maximum at an output port of the IDG and / or a maximum oil temperature of the propulsion engine; assesses a trend of one and / or the other of the oil temperature maxima over several flights; and generates an alarm when the trend of one and / or the other of the oil temperature maxima shows that a predetermined threshold has been exceeded.

The utility model discloses a back-flushing type vacuum liquid filling device which comprises an oil storage tank, a valve frame is arranged on one side of the oil storage tank, a backflow valve and a booster pump are installed on the top of the oil storage tank, an air inlet pipe is connected to the top of the oil storage tank in a penetrating mode, and an oil cavity is formed in the top of the valve frame. The bottom of the oil cavity is connected with a plurality of one-way switch valves in a penetrating mode, the bottoms of the one-way switch valves are connected with liquid filling pipes in a penetrating mode, the bottoms of the liquid filling pipes are provided with connectors in a screwed mode through threads, one ends of the connectors are connected with equipment to be filled with liquid in a penetrating mode, and sliding grooves are correspondingly formed in the side wall of the valve frame. A sliding groove is formed in the valve frame, a sliding seat is slidably connected outside the sliding groove in a sleeved mode, racks are correspondingly arranged on the inner walls of the two sides of the valve frame, gears are correspondingly installed on the inner walls of the two ends of the sliding seat in a rotating mode, the racks are meshed with the gears, a collecting groove is formed in the bottom of the valve frame, and the collecting groove and the backflow valve are of a matched structure.

Supercharger motor system for a motor vehicle, comprising: an internal combustion engine, a small-capacity, variable-geometry turbocharger designed to meet the charge air requirement up to a predefined supply value, and an electrically driven compressor arranged in parallel to the turbocharger, which is operated by an electronic control unit, wherein the engine is configured to receive a primary supply of charge air during normal engine operation below the predefined supply value from the turbocharger and to receive an additional supply of charge air from the electrically driven compressor when it is necessary to meet a temporary high demand for charge air above the predefined supply value, and a recirculation circuit to build up pressure when the electrically driven compressor starts up before the electrically driven compressor is connected to the engine, wherein the recirculation circuit includes an electrically controlled recirculation valve for directing the airflow through a duct connecting an outlet of the electrically driven compressor to an inlet of the electrically driven compressor.an electrically controlled shut-off valve positioned between the outlet of the electrically operated compressor and the motor for selectively isolating the outlet of the electrically operated compressor from the motor, and a non-return valve to prevent backflow of air from the inlet of the electrically operated compressor into the atmosphere, wherein the electronic control unit is configured to , Keeping the electrically controlled return valve open and the electrically controlled shut-off valve closed when the electrically operated compressor starts up, until the pressure in the return circuit reaches a predefined limit value, and in response to reaching the predefined limit value, opening the electrically controlled shut-off valve and closing the electrically controlled return valve.

The utility model belongs to the field of gasification emptying pipelines, and particularly relates to a gasification emptying pipeline liquid collection adding device which comprises a liquid collection tank and a safety valve, a condensate pump is arranged on the liquid collection tank, a blind plate is arranged on the safety valve, a one-way valve is arranged on the liquid collection tank, and an air emptying pipeline is arranged on the one-way valve. The liquid collecting tank is provided with a machine pump backflow valve, and a heat tracing pipeline is arranged on the machine pump backflow valve. According to the scheme, the pressure gauge, the safety valve, the blind plate, the gate valve, the one-way valve, the liquid level meter and other components are designed, and during use, a gas-liquid mixture of an emptying pipeline enters the liquid collecting tank for gas-liquid separation; a gas phase enters an emptying pipeline through a top valve, and a liquid phase is conveyed into a system for recycling through a condensate pump; low-pressure nitrogen is used as replacement nitrogen during device maintenance; heat-tracing water is used for freezing prevention in winter; and desalted water is used as condensate pump mechanical seal flushing water, and the device has the characteristics of being good in environmental protection effect, high in safety, convenient to maintain and capable of bringing certain economic benefits.

The utility model relates to the technical field of hydropower, in particular to a hydropower station valve locking mechanism and an anti-backflow valve, which comprise a connecting component and a fixing component, the connecting component comprises a valve, a mounting bracket and a fixing seat fixedly mounted on the fixing seat, the mounting bracket is fixedly connected with the valve, and the fixing component is fixedly connected with the valve. Comprising a ratchet wheel, a pawl matched with the ratchet wheel in a clamped mode and an auxiliary part fixedly installed on one side of the ratchet wheel, the ratchet wheel is fixedly installed on a rotating shaft of a valve, the ratchet wheel and the pawl can be installed on a valve fixing base through cooperation between a fixing assembly and a connecting assembly, overall work cannot be affected, and space is saved; and meanwhile, through one-way matching between the pawl and the ratchet wheel, the valve can be locked, and meanwhile the valve can be prevented from being closed when impacted by water flow.

The invention discloses a horizontal dynamic liquid film evaporation energy-saving system based on heat pump circulation. Comprising a raw material storage tank, mechanical seal cooling equipment, horizontal dynamic film continuous evaporation equipment, horizontal dynamic film continuous condensation equipment, a piston compressor, a reflux valve, a thermometer, a pressure gauge, a gas-liquid separation tank, a condenser, a concentrated liquid collection pipe, a vacuum pump, a peristaltic pump and a condensate collection tank. The horizontal type dynamic liquid film evaporation energy-saving system based on the heat pump cycle is used for providing heat exchange energy supply for a horizontal type dynamic liquid film evaporation system, refrigerating / heating work is achieved at different stages through the same medium, and sensible heat-latent heat conversion loss caused by medium switching (such as steam and hot water) in a traditional system can be avoided. The continuous evaporation and concentration of heat-sensitive materials are realized, the stable control of evaporation conditions is ensured, the evaporation efficiency and the continuous production level are improved, and the problems that the evaporation efficiency is low and continuous production is difficult to realize in the traditional process are solved; meanwhile, a heat pump circulating system is adopted, low-grade waste heat of secondary steam can be recycled and boosted into a recyclable high-grade heat source, and the heat efficiency of the system is greatly improved.

The invention discloses a sweeping spray pump operation system, an operation method and a ship, and the system comprises a sweeping spray pump which is arranged at the bottom of a liquid cargo tank. The spraying main pipeline is arranged outside the top of the liquid cargo tank and connected with the sweeping spraying pump through a sweeping pipeline, a pipeline connected to the top of the liquid cargo tank is arranged on the spraying main pipeline, a cargo tank spraying opening is formed in the tail end of the pipeline, and a control valve sweeping pipeline is arranged between the cargo tank spraying opening and the spraying main pipeline. And a sweeping spray pump discharge valve, an outlet check valve and a header pipe isolating valve are sequentially arranged from top to bottom. One end of the return pipeline is communicated between the outlet check valve and the main pipe isolating valve, the other end of the return pipeline is communicated with the bottom of the liquid cargo tank, and a return valve is arranged on the return pipeline. According to the method, the smooth starting process of the domestic sweeping spray pump can be ensured, the operation flow interval of the domestic sweeping spray pump is reasonably expanded, the adaptation degree of the domestic sweeping spray pump, deep cooling equipment and a ship power system is enhanced, and the comprehensive availability, operation stability and comprehensive working performance of the equipment are improved.

The utility model relates to the technical field of rectification and purification, and discloses a reflux device for rectification and purification of methyl isobutyl ketone, which comprises a support frame, a rectification tower is fixedly connected to the middle of the top wall of the support frame, a reflux pump is fixedly connected to the top of the outer wall of the rectification tower, and the other end of the reflux pump is communicated with a condenser. The condenser is fixedly connected to the rear side of the outer wall of the rectifying tower, the flow control system is fixedly connected to the bottom of the outer wall of the connecting pipe, and a closing mechanism is arranged in the middle of the inner wall of the supporting frame and used for preventing a backflow valve. According to the methyl isobutyl ketone rectifying and purifying device, methyl isobutyl ketone mixed liquid is heated in the rectifying tower, low-boiling-point components are vaporized and rise, high-boiling-point impurities are left at the bottom of the tower and pumped to the condenser through the reflux pump, liquid enters the reflux tank through the conveying pipe, condensate is stored in the reflux tank, and stable operation and cooperative work of the device are ensured through the supporting frame so as to rectify and purify methyl isobutyl ketone.

A method for defrosting an evaporator of a refrigeration system includes providing a refrigeration system including a low temperature (LT) compressor, a medium temperature (MT) compressor, a low temperature evaporator, and a medium temperature evaporator. The method includes initiating a defrost cycle for the refrigeration system by closing a return valve to shut off refrigerant return to the LT compressor from an outlet of the low temperature evaporator and opening a defrost supply valve to define a fluid flow path between a suction side of the MT compressor and an outlet of the low temperature evaporator. The method includes operating the LT compressor and the MT compressor such that warm refrigerant from the suction side of the MT compressor is provided through the low temperature evaporator and returned to a suction side of the LT compressor through a hot gas tank.

The application discloses a low-temperature liquid rocket engine immersion precooling system and method, and belongs to the technical field of liquid rocket engine precooling, which comprises a low-temperature propellant tank, a conveying pipeline, a low-temperature pump, a post-pump pipeline and low-temperature valves; the application only utilizes necessary heat exchange components of the engine to realize immersion precooling, and does not need to set a discharge valve, a discharge pipeline, a reflux pipeline and a reflux valve, so that the system structure is greatly simplified; the precooling process does not need propellant discharge, effectively reduces the propellant consumption, and improves the rocket carrying capacity; in combination with an overall layout of an inclined downward direction, a guide inner wall and an inclined upward design of the post-pump pipeline, a continuous exhaust passage is constructed, gas is ensured to smoothly float up, and the precooling efficiency is greatly improved; by limiting the relative relationship between the inclination degrees of the guide inner wall and the post-pump pipeline, the gas floating rate can be flexibly optimized according to different working conditions, the best balance between the exhaust efficiency and the flow stability is realized, and the system working condition adaptability and the precooling effect controllability are remarkably improved.

The application discloses a centrifugal blade pump with adjustable blade pitch and a flow guarantee control method thereof, and belongs to the technical field of lifting pump systems. The application aims to solve the problem that the traditional centrifugal pump is prone to blockage when lifting solid-liquid mixtures containing large particles. The pump can judge whether blockage occurs according to the flow rate difference by dynamically adjusting the blade pitch and combining with the ultrasonic flowmeter technology to monitor the flow rate in real time. When blockage occurs, the control system adjusts the impeller spacing, reverses the blades and opens the backflow valve to discharge the blockage, ensuring the normal operation of the pump body. The method can avoid pump blockage and improve fluid conveying efficiency. In addition, the system has intelligent control and automatic adjustment functions, can accurately adjust according to the actual fluid working condition, and is especially suitable for conveying large-particle solid-liquid mixtures in the fields of mining, chemical industry, sewage treatment and the like.

A system for bleeding air from a compressor of an aircraft engine, the system comprises a bleed off valve and a plenum for receiving bleed air from the compressor via the bleed off valve. The plenum has a first outlet for discharging the bleed air from the plenum into the atmosphere, and a second outlet fluidly connected to the compressor for reinjecting a portion of the bleed air into an air intake portion of the compressor. A backflow valve is provided for selectively closing the first outlet of the plenum. The backflow valve has an actuator operable to displace a closure from a closed position to an open position upon a fluid pressure inside the plenum reaching a pressure threshold.

The utility model provides a flow path structure for an internal combustion engine. The flow path structure can restrain an exhaust gas recirculation gas channel from generating condensate water. A flow path structure for an internal combustion engine includes: a channel body provided on a side surface of the internal combustion engine and connected to a water jacket inside the internal combustion engine; the cooling water channel is arranged in the horizontal direction, and the channel body is connected to the radiator through the cooling water channel; a catalyst device connected to the internal combustion engine; the air inlet device is connected to the internal combustion engine; the exhaust gas recirculation device comprises a water-cooled heat exchanger and a return valve, and the water-cooled heat exchanger and the return valve are connected to the catalyst device and the gas inlet device; an exhaust gas recirculation gas passage connected to the downstream end of the return valve and connected to the intake device; and a heat exchanger return passage connected to the water-cooled heat exchanger, the exhaust gas recirculation gas passage and the heat exchanger return passage being provided along the cooling water passage, the cooling water passage, the exhaust gas recirculation gas passage, and the heat exchanger return passage being integrally formed in the passage body.