291 results about "Reflux valve" patented technology

The invention discloses a series compressor system for salt-cavern compressed air energy storage and a start-stop control method, belongs to the technical field of salt-cavern compressed air energy storage, and aims to solve the technical problems that a traditional start mode needs to manually operate a CCS control system, and start failure is easily caused. The system comprises a single-row compressed air system or a plurality of compressed air systems which are connected in parallel; the compressed air system comprises a first-section compressor module, a second-section compressor module, a third-section compressor module, a fourth-section compressor module and a CCS compressor control module which are sequentially connected in series. The series compressor unit can be sequentially started and stopped through one key according to the control logic, safety and reliability are achieved, meanwhile, an anti-surge valve, an electric control valve and a return valve corresponding to the compressor can be automatically adjusted to meet the process change in the starting process, and manual intervention is not needed.

The invention discloses a five-section anti-surge control method for a cracked gas compressor. Comprising two sets of anti-surge systems in a cracking compressor cold and hot reflux control mode, wherein the anti-surge systems are composed of five-return five-hot reflux valves B connected to an outlet of a cracking gas compressor and a cracking gas feeding end and five-return five-cold reflux valves A connected to an outlet of a reflux tank of a high-pressure depropanizing tower and the cracking gas feeding end; the two compressor anti-surge control systems carry out coordinated control on backflow of the five-return five-hot-backflow valve B and backflow of the five-return five-cold-backflow valve A. Anti-surge control over the five-return five-cold-backflow valve A is added. The cold reflux control compressor anti-surge control system is provided with flow low limit control of a five-section outlet C2 hydrogenation unit and 30% opening limit of a hot anti-surge valve. The anti-surge line of the five-return five-cold-backflow A valve is consistent with that of the five-return five-hot-backflow B valve, and the anti-surge line is 1.2 times that of the five-return five-hot-backflow B valve. According to the invention, the technical problem of more stable control of the five-section anti-surge valve can be solved.

A manifold for collecting a tissue sample with a medical waste collection assembly. A base portion of a housing is removably engaged with a manifold receiver to provide a suction path from an inlet fitting receiving a suction line. A tray may be removably positioned within an accessory sleeve. Locating features facilitate defining a gap between a base portion of the tray and a lower barrier of the accessory sleeve. The tray may include a control surface to move the manifold between a sealing configuration, and a bleed configuration in which a second suction path is provided through the gap and below the tray. A backflow prevention valve may be disposed within the suction path between the tray and a filter element. Methods for collecting the tissue sample are also disclosed.

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 injection molds, and discloses a semiconductor packaging injection mold which comprises a fixed mold, a movable mold, a supporting table, a double-shaft telescopic air cylinder, an injection molding cavity, a multi-point controllable ejector pin mechanism, a hydraulic demolding mechanism and the like. According to the mold, balanced closing and separation of the movable mold are achieved through the double-shaft telescopic air cylinder, the injection molding cavity is matched with the surface of a semiconductor packaging product, and the accuracy of the sealing cavity is ensured. The multi-point controllable ejector pin mechanism is composed of ejector pins, reset springs and magnetic pushing assemblies, the ejector pins are distributed in a matrix mode, and damage to packaged products is reduced. And the hydraulic demolding mechanism realizes uniform injection of a demolding agent through a conveying hole, a liquid guide pipe and an anti-reflux valve, so that the stability and no damage in the demolding process are ensured. According to the mold, automatic control is combined, synchronous forming of the double injection molding cavities is achieved, the productivity is effectively improved, silicone oil emulsion is adopted as a release agent, a lubricating film is formed, and the production efficiency and the product quality are improved.

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 utility model discloses a water dispenser system with backflow pressure relief function, which comprises a filter unit, a booster pump, a reverse osmosis membrane group and a drinking device which are communicated in sequence, a three-way backflow valve is arranged on a water path where the booster pump is communicated with the filter unit, and a water flow switch valve is arranged at the water production end of the reverse osmosis membrane group. The water inlet end of the water flow switch valve is provided with a return pipe communicated with the three-way return valve, and the water outlet end of the water flow switch valve is intersected with the water inlet end of the drinking water equipment; water at the water production end is conveyed to the three-way return valve through the return pipe, so that the water production end of the reverse osmosis membrane group is decompressed to avoid frequent starting of the water flow switch valve, and then the water is conveyed to the reverse osmosis membrane group through the booster pump. When the water consumption of the water using end is small, repeated power-on and power-off of the water flow switch valve can be avoided, potential safety hazards of a water dispenser system are reduced, meanwhile, pressure relief can be achieved at the water producing end, and normal use and the filtering effect of the reverse osmosis membrane group function are ensured.

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 belongs to the technical field of ships, and provides a large bulk cargo ship high-pressure CO2 storage system based on seawater cold insulation, which comprises a high-pressure storage tank, a storage tank cavity, a temperature sensor, a control unit, a supercharging device, a pressure sensor, a cooling device, an electromagnetic valve, a safety valve, a seawater valve, a seawater pump, an inlet valve, a release valve, a return valve, a drain valve and a void chamber. CO2 is pressurized, seawater is utilized for sufficient heat exchange, the pressure of the high-pressure storage tank is at the lowest pressure corresponding to the temperature of the seawater, power consumption of the pressurizing device is greatly reduced, and compared with a low-temperature CO2 liquefaction mode which needs large low-temperature refrigeration power consumption, the high-pressure storage tank does not need to consume power for refrigeration and heat preservation, the power consumption is lower. And meanwhile, liquefied CO2 is stored in the high-pressure storage tank, and seawater is utilized to fully exchange heat with the liquid CO2 in the high-pressure storage tank, so that the CO2 in the high-pressure storage tank is always kept in a liquid state, and the condition that the weight of the CO2 loaded in a single high-pressure storage tank is reduced due to the fact that the CO2 is in a gaseous state is avoided.

The present invention concerns an explosive material charging device (1) and a method of positioning the explosive material charging device (1) in a borehole (3). The explosive material charging device (1) comprises a top anchor unit (5) and a bottom anchor unit (7) each configured to engage the borehole wall (8), an expandable tube member (11) arranged between the top anchor unit (5) and the bottom anchor unit (7) and configured to be charged with explosive material (40), the bottom anchor unit (7) comprises a backflow prevention valve device (13) configured to prevent the explosive material (40) to flow out from the expandable tube member (11), wherein the backflow prevention valve device (13) is openable for permitting a charging hose (15) to enter the expandable tube member (11) for reaching the interior of the top anchor unit (5),

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.

The utility model discloses a desulfurization wastewater treatment system, which comprises a plurality of effector units, a reflux valve and a live steam valve, the effector units are connected in sequence; the live steam inlet of the first effector unit is provided with a live steam valve; the desulfurization wastewater outlet of the last effector unit is provided with a reflux valve, and the desulfurization wastewater outlet of the last effector unit is connected with the desulfurization wastewater inlet of the first effector unit through the reflux valve; the live steam valve is configured to act according to the live steam valve control instruction.

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 utility model relates to the technical field of fire hydrant detection, in particular to a rotary type fire hydrant water pressure detection device which comprises a flange plate, a first connecting pipe, a second connecting pipe, a three-way valve, a pressure gauge, a recycling bin, a water outlet pipe, a valve, a return valve, a bottom plate, a lifting assembly and a moving assembly. The height of the flange plate is adjusted through the lifting assembly, the flange plate is connected after being close to the fire hydrant, then the fire hydrant is opened for pressure detection, at the moment, water flow sequentially passes through the first connecting pipe, the three-way valve and the second connecting pipe to enter the recycling bin, and when the recycling bin is fully loaded, the numerical value on the pressure gauge is read, and then the fire hydrant is closed; and the backflow valve prevents water in the first connecting pipe from flowing back, so that the flange plate can be conveniently disassembled and assembled by the detection personnel, water resource waste caused by water source backflow is avoided, and the working efficiency of the detection personnel is improved.

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.

The utility model relates to the technical field of gas-fired boilers, in particular to gas-fired boiler flue gas waste heat recovery equipment which comprises a boiler body, a condenser is arranged at one end of the boiler body, a heat collector is arranged at one end of the condenser, a chimney is arranged at one end of the heat collector, and a heat exchanger is arranged at the other end of the chimney. The top of the boiler body, the top of the condenser and the top of the heat collector are provided with a pipe jacking frame, the bottom of the boiler body, the bottom of the condenser and the bottom of the heat collector are provided with a communicating pipe frame, and one end of the bottom of the communicating pipe frame is provided with a heat pump unit. By arranging the boiler body, the condenser, the heat collector, the chimney, the pipe jacking frame, the hot water backflow pipe, the second backflow valve seat, the liquid outlet seat, the liquid outlet valve seat and the heat preservation inner container, in order to recycle heat discharged into the atmosphere, an original boiler smoke discharging system is transformed, the condenser is additionally arranged on the chimney firstly, and the heat collector is additionally arranged on the chimney; after gas is combusted, smoke firstly exchanges heat with heat supply first net return water entering the boiler body through the condenser.

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.

The compressor unit includes a first return valve, an adjustment unit that adjusts a hydrogen gas treatment amount in a subsequent compression stage, an upstream temperature sensor, and a control unit. The control unit is capable of executing: a first control for controlling the first return valve so that the suction temperature is within a predetermined temperature range by referring to the suction temperature acquired by the upstream-side temperature sensor; and a second control for controlling the adjustment means in such a manner that the amount of throughput of the subsequent compression stage is adjusted in accordance with the amount of pressure change in the intermediate flow path generated by the first control. The predetermined temperature range is set in a range higher than a reference temperature based on the liquefaction temperature of the air and lower than 0 DEG C.

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.