43results about How to "Achieve flow control" patented technology

This invention discloses a stator internal gas-inducing efficient anti-surge steady expansion device of a multi-stage axial compressor composed of a stator, a gas-suction groove, a gas-inducing pipe and a gas-collecting chamber, in which the stator is stator blade in the multi-stage axial compressor, the groove, one or many, is placed in a region adjacent to flow separation existing on the surface of the stator suction face, the gas inducing pipe is in the stator blade and a ventilation pipe connecting suction pipes, the collecting chamber is set outside of the runner box and collects gas flows induced by the gas-inducing pipe after the suction groove absorbs small low energy gas flows, and the suction groove absorbs fluids of low energy on the surface of the stator suction side and transports them to the chamber and discharges them out of the system after mixed press.

The invention relates to a method for exciting and controlling gas flow of the stator blade end wall of an axial-flow compressor by the aid of plasmas, which is characterized by including the steps: laying a plasma pneumatic exciter on the stator blade passage end wall of the axial-flow compressor, wherein the front edge and the tail edge of an electrode of the plasma pneumatic exciter are level to the front edge and the tail edge of a stator blade respectively, and the direction of the electrode is parallel to a mean camber line of the stator blade; when an engine controller detects flow instability indication, loading electric signals to the electrode of the plasma pneumatic exciter by employing a pulse plasma power source; and when the engine controller detects disappearance of flow instability indication, sending out control signals, and closing the plasma pneumatic exciter. The control method is capable of effectively suppressing stator blade angle area flow separation of the axial-flow compressor, short in exciting response time and wide in bandwidth, and has an important role in reduction of stator blade wake pitot loss and improvement on stability and efficiency of the compressor.

The invention provides an authigenic heat injection composition for underground catalytic oxidation of crude oil. The injection composition is a three-phase stable disperse system composed of water phase (anionic surfactant), an auxiliary agent, solid phase (nano-catalyst) and gas phase (air); the injection composition comprises the following raw materials: 0.1-1% of anionic surfactant taken as water phase, 0.1-1% of auxiliary agent, 0.1-1% of nano-catalyst taken as solid phase, and the balance of water, wherein the sum of the mass percent of the water phase, the auxiliary agent, the solid phase and the water is 100%; the volume ratio of the adding amount of the air to the total amount of the water phase, the auxiliary agent, the solid phase and the water is (3-7): 1. After the injection composition is adopted, the sweep efficiency of the air can be improved, the synchronous carrying of the catalyst and the air can be realized, and the problem of separation of underground air and catalyst can be avoided; the composition contains the efficient nanometer oxide catalyst, and the crude oil can be catalyzed to have oxidation reaction under the mild conditions, and therefore the problem that the stratum is blocked by coking caused by severe oxidation reaction is effectively avoided.

The invention provides a method for improving the recovery ratio of an oil field by use of blasting type pre-crosslinking gel particles, and particularly relates to a method for improving the recovery ratio of an old oil field with high water cut. The method adopts a kind of pre-crosslinking gel particles; the pre-crosslinking gel particles absorb water to expand and form a solution after staying for a certain time at the formation temperature and pH condition; and the method for improving the recovery ratio of an old oil field with high water cut comprises the following steps of: mixing the pre-crosslinking gel particles with water so that the pre-crosslinking gel particles absorb water to expand; injecting the pre-crosslinking gel particles underground so that the pre-crosslinking gel particles firstly block big pore channels and ultrahigh-permeability layers near the well in an oil pool, wherein after the pre-crosslinking gel particles experience the action of the oil pool temperature for a certain time, the gel particles automatically blast to form a polymer viscose solution which enters the deep of the oil pool to realize control on oil-water fluidity; and performing oil extraction. The method provided by the invention is suitable for improving the petroleum recovery ratio of the oil pool at the stage of high water cut.

The invention belongs to the technical field of pressure gas fluidic engineering and gas expansion refrigeration, and relates to a frequency adjustable sonic wave fluidic oscillator. The frequency adjustable sonic wave fluidic oscillator is special equipment necessary for gas refrigeration machinery. A sonic wave type oscillation fluidic generator which changes in frequency under the combined action of a flow channel regulating mechanism and a gas volume regulating mechanism and has a non-stable self-excitation characteristic is used as a fluidic distributor of the frequency adjustable sonic wave fluidic oscillator, and is a precondition for implementing a refrigerator matched with the frequency adjustable sonic wave fluidic oscillator. The frequency adjustable sonic wave fluidic oscillator is not sealed by any moving parts, has good reliability, small size, high power, and low cost, is suitable for processing a high-pressure gas medium and is applied to an expansion refrigerator, canadapt to severe working environments such as strong radiation, strong corrosion, strong vibration and strong impact, and has no electronic interference. Therefore, the frequency adjustable sonic wavefluidic oscillator can be widely used in complex working conditions such as strong radiation, strong magnetic field, flammability, and easy explosion or in pure fluid working systems.

The invention relates to a frequency conversion energy-saving temperature control device of a refrigerating device, comprising a frequency conversion compressor, a condenser, an expansion device and an evaporator; the frequency conversion energy-saving temperature control device is also provided with a first bypass circuit and a flow rate control valve thereof which are used for receiving high temperature and high pressure gaseous refrigerant output by the frequency conversion compressor and outputting the gaseous refrigerant into an input end of the evaporator, as well as a second bypass circuit and a flow rate control valve thereof which are used for receiving high temperature and high pressure gaseous refrigerant output by the frequency conversion compressor and outputting the gaseous refrigerant into an input end of the frequency conversion compressor. By using the hot gas bypass circuits, the first flow rate control valve and the second control valve to respectively reflect volume control, rapid reaction and the temperature change of working fluid of a working machine connected with the evaporator, the device can accurately carry out constant temperature control.

The invention relates to a bellows-type piezoelectrically-hydraulically-actuated microfluidic servo valve and an actuating device thereof and belongs to the technical field of microfluidic control. The problems of poor sealing reliability and instability in amplification factors of hydraulic amplification by means of matching piezoelectric actuating with a hydraulic amplifier in existing microfluidics are solved. A first accommodating cavity retainer of the servo valve is in the shape of a drum, a through hole is arranged at the center bottom of the drum, a piezoelectric diaphragm covers and is fixed on the first accommodating cavity retainer, an outlet side of the first accommodating cavity retainer and an inlet side of a second accommodating cavity retainer are communicated in a sealing manner through a bellows, and an elastic diaphragm covers and is fixed on an outlet side of the second accommodating cavity retainer. The actuating device comprises a piezoelectric servo amplifier, a digital-to-analog converter, a microprocessor, an analog-to-digital converter and a pressure sensor. The bellows-type piezoelectrically-hydraulically-actuated microfluidic servo valve and the actuating device thereof are applicable to a piezoelectrically-hydraulically-actuated microfluidic system.

The invention discloses an air inlet channel structure and a manufacturing method thereof. The air inlet channel structure is S-shaped or serpentine, a plurality of shark skin scale-shaped structuresare arranged on the inner wall of the air inlet channel structure, the shark skin scale-shaped structures are arranged in an array mode in the circumferential direction or the axial direction of the air inlet channel structure, and the arrayed array density is different, when axial arrangement is conducted, the array density arranged at the two sides of a large bent angle in the arraying mode is larger than that of the array arranged in the other areas in the arraying mode. According to the air inlet channel structure, the separation flow of a boundary layer of the air inlet channel is controlled, the problems that an existing air inlet channel flow control mode needs to increase additional energy and an auxiliary mechanism as well as the self-adaptive performance is poor are solved; and the circumferential or axial array arrangement mode of the shark skin scale-shaped structures can inhibit the flow separation of the boundary layer in a maximal and continuous mode, and the air inlet channel structure is wider in applicability.

The invention discloses an automatic vacuum electrolyte filling device comprising a rack body, a vertical beam, a numerical control platform, a vacuum filling head, a numerical control computer system touch screen, an electrolyte hopper and a battery installation fixture. The bottom end of the vertical beam is perpendicularly connected with the rack body, the battery installation fixture is installed on the top end of the rack body, the battery to be filled is installed on the battery installation fixture, the top end of the vertical beam is connected with the numerical control computer system touch screen, the vacuum filling head is connected with one end of the numerical control platform, and the electrolyte hopper is connected with the other end of the numerical control platform. According to the device provided by the invention, the stable and reliable two-dimensional numerical control platform is used for achieving motion positioning of the filling head, and filling of the electrolyte with precision less than 0.5ml is automatically completed; information such as battery pack size parameters and capacity of the electrolyte to be filled into the single battery can be input via the computer system touch screen of the device, and position computation of each filling hole is achieved by using a computer.

The invention discloses a flow control method and device for zinc liquid in a hot galvanizing zinc pot. The control method disclosed by the invention comprises the following steps: promoting zinc liquid (2) to respectively outwards diffuse and flow towards areas (I, II, III and IV) formed among the left side, right side and front end of the zinc pot, strip steel and a furnace nose (4) by virtue ofthe blowing effect of an air knife above the hot galvanizing zinc pot (1) on the strip steel (3), and dragging top ballast which is rapidly produced on the surface of the zinc liquid to outwards flowtowards the area; arranging multistage traveling wave magnetic field generators (71, 72, 73, 74, 75, 76, 77 and 78) above the surface of the zinc liquid in the zinc pot on the edge sides of the areasso as to excite the traveling wave magnetic field to generate electromagnetic propulsion on the zinc liquid so as to drive the zinc liquid to flow, mutually linking the zinc liquid flow caused by thetraveling wave magnetic field generators with blowing flow of the air knife, and promoting the zinc liquid on the surface of the zinc pot to orderly flow towards the rear end (the Vth area) of the zinc pot; dragging the top ballast floating on the surface of the zinc liquid to flow according to the control direction by the flowing zinc liquid.

The invention relates to a DC interline power flow controller. The DC interline power flow controller comprises a first terminal, a second terminal, a third terminal and a fourth terminal, wherein the first terminal is connected with a first power transmission line, the third terminal is connected with a second power transmission line, the second terminal and the fourth terminal are connected in parallel and then are connected with a third power transmission line, power flows to the third power transmission line from the first power transmission line and the second power transmission line, the DC interline power flow controller comprises a bidirectional DC / DC converter and a solid-state transformer, the bidirectional DC / DC converter is connected in series with the solid-state transformer, input ends of the bidirectional DC / DC converter are the first terminal and the second terminal, an output end of the bidirectional DC / DC converter is connected with an input end of the solid-state transformer, and output ends of the solid-state transformer are the third terminal and the fourth terminal. By the DC interline power flow controller, DC electric energy flow control can be achieved, the isolation of a circuit is achieved by using the solid-state transformer, and the circuit structure is simple.

The invention belongs to the technical field of jet control engineering refrigeration of pressure gas, and relates to a self-excited microjet control multi-tube oscillator. The self-excited microjet control multi-tube oscillator is special equipment of gas jet control like a refrigeration device, a same-gas-source fluid separated from main jet and equal to the total pressure of the main jet is intruded into a self-excited oscillating cavity from the outside, self-excited oscillating is carried out to generate periodic microjet, the main jet is pushed and pressed at the wall attaching side froma perpendicular exciting opening, the manner of pushing and pulling the main jet is used for achieving main jet oscillating, the main pressure is increased and continues, continuous oscillating is finally achieved, and the problem that energy consumption is high due to self-excited jet oscillating is solved. The oscillator has the advantages of being simple in structure, convenient to operate andmaintain and the like, external power is not needed, running is stable and reliable, and the self-excited microjet control multi-tube oscillator is suitable for treating high-pressure gas media.

The invention provides a synthetic jet actuator which performs periodic air blowing and suction through repeated oscillation of a piezoelectric film to convert consumed electric energy into fluid kinetic energy. The synthetic jet actuator comprises a cavity, the long-strip-shaped piezoelectric film, a long-strip-shaped piezoelectric actuator and an air bleeding channel; the cavity has a lower opening and an upper opening; the area of the section of the lower opening is larger than that of the section of the upper opening; the long-strip-shaped piezoelectric film covers the lower opening in a matched manner; the long-strip-shaped piezoelectric actuator is arranged below the piezoelectric film; the air bleeding channel is connected with the upper opening in a matched manner; and the long-strip-shaped piezoelectric actuator is driven by a rectangular pulse signal to have the inverse piezoelectric effect, the piezoelectric film is driven to oscillate up and down periodically, air in the cavity oscillates along with the piezoelectric film, and then the periodic air blowing and suction effect is produced in the air bleeding channel. The invention further provides a horizontal-axis wind turbine blade comprising the synthetic jet actuator. By the aid of the blade, flowing control can be realized, so that the strength of the trailing vortex of a wind turbine is reduced, the dissipationof the trailing vortex is accelerated, oscillation of the wind turbine blade is reduced, and the service life of the wind turbine is prolonged.

The invention discloses a slotting type wind turbine blade device and a slotting method thereof. The slotting type wind turbine blade device comprises a blade body; the blade body comprises a positivepressure face and a back pressure face; a gap communicating with the positive pressure face and the back pressure face is formed inside the blade body, the gap comprises a gas inlet located in the positive pressure face and a gas outlet located in the back pressure face, and after gas flows into the gap from the positive pressure face and then flows out from the back pressure face. The slotting method thereof has the beneficial effects that an extra gas source is not needed, an extra device does not need to be additionally arranged on the surface of a fan blade, and flow control is achieved;high-pressure gas on the positive pressure face is introduced into a low-pressure area on the back pressure face, so that the flow velocity of the positive pressure face is reduced, the pressure of the positive pressure face is increased, in addition, the flow velocity of the back pressure face is increased, the pressure of the back pressure face is reduced, and the lift of the blade is further improved. Compared with the mode that a vortex generator is directly installed on the surface of the blade, damage to the surface of the blade is small, extra resistance cannot be brought under the small attack angle, and it is guaranteed that the aerodynamic performance in the non-flow control state is not reduced.

The invention discloses a method and a device for controlling the flow of zinc liquid in a hot-dip galvanizing pot. The control method of the present invention is: the blowing effect of the air knife above the hot-dip galvanizing zinc pot (1) on the strip steel (3) promotes the zinc liquid (2) to the left side, the right side, the front end of the zinc pot, and the strip steel The area (I, II, III, and IV) formed between the furnace nose (4) diffuses and flows outwards, and drags the rapidly generated surface slag on the surface of the zinc liquid to flow outwards to the area; in the area On the edge side, multi-stage traveling wave magnetic field generators (71, 72, 73, 74, 75, 76, 77, 78) are set above the surface of the zinc liquid in the zinc pot to excite the traveling wave magnetic field to generate electromagnetic driving force for the liquid zinc to drive the liquid zinc to flow , the zinc liquid flow caused by the traveling wave magnetic field generator is connected with the spray flow of the air knife to promote the orderly flow of the zinc liquid on the surface layer of the zinc pot to the rear end of the zinc pot (the V zone); the surface floating on the surface of the zinc liquid The slag is dragged by the flowing zinc liquid to flow in a controlled direction.

The invention relates to the technical field of engineering surveying, in particular to an engineering surveying pay-off device. Comprising a base, two supporting plates are installed on the upper end face of the base in a bilateral symmetry mode, U-shaped grooves are formed in the upper ends of the two supporting plates, winding devices are arranged on the U-shaped grooves, arc-shaped blocks are arranged below the winding devices, the arc-shaped blocks are installed on the upper end face of the base, and sliding grooves are evenly formed in the rear sides of the upper end faces of the arc-shaped blocks; an isolation cover is installed on the sliding groove in a sliding fit mode, a pull rod is arranged on the front side of the isolation cover, the pull rod is installed on the circumferential outer wall of the isolation cover, a clamping groove is formed in the end face of the front side of the arc-shaped block, an ink moistening device is installed on the clamping groove, a clamping opening is formed in the front side of the upper end face of the arc-shaped block, and an elastic piece is arranged in the clamping opening; the front side end part of the isolation cover is inserted into the bayonet and is fixed with the elastic sheet in an abutting manner; according to the invention, the ink fountain cotton thread is convenient to replace, the continuous use time of the ink fountain is prolonged, and the service life of the ink fountain is ensured.

The invention discloses a rotary multifunctional valve core. The rotary multifunctional valve core comprises a shell, a handle, a ceramic moving piece, a ceramic static piece and a base. A first annular groove is formed in the outer side of the top of the shell. A first sealing O-type ring is arranged in the first annular groove. Two second annular grooves are formed in the handle in sequence. Second sealing O-type rings are arranged in the second annular grooves. A third annular groove is formed in the top of the ceramic moving piece. A third sealing O-type ring is arranged in the third annular groove. A fourth annular groove is formed in the outer side of the base. A fourth sealing O-type ring is arranged in the fourth annular groove. The handle, the ceramic moving piece and the ceramicstatic piece are arranged in the shell in sequence. The handle is arranged above the ceramic moving piece. The ceramic moving piece is arranged above the ceramic static piece. The shell is arranged onthe base. First sealing rubber is arranged at the bottom of the base. The rotary multifunctional valve core is simple in structure, can be opened and closed, realizes the function switching of flow and water temperature adjustment and water distribution, reduces the cost, is diversified in function and convenient to operate and adjust, and can be beneficially popularized.

The invention relates to the technical field of medical instruments, in particular to a portable low-temperature cryoscalpel. The portable low-temperature cryoscalpel comprises a nozzle, a steel cylinder and a switch mechanism. The portable low-temperature cryoscalpel is characterized in that the mouth of the steel cylinder is connected with the nozzle through the switch mechanism, and the steel cylinder is a detachable steel cylinder. Compared with the prior art, the portable low-temperature cryoscalpel has the advantages that the low-temperature steel cylinder can be independent of other control and spraying units, and different sizes or types of steel cylinders are available; the diameter of the tail end of a flow channel inside the nozzle is 0.03-0.1mm, and different treatment strategies can be worked out through matching between the nozzle and the steel cylinder; in addition, due to the fact that a labyrinth sealing method is adopted between the flow channel and an ejector pin device, leakage of high-pressure low-temperature liquid gas and loss of local cold energy are effectively avoided, the frequency of replacement of the steel cylinder and the frequency of liquid filling are greatly reduced, and treatment cost and maintenance cost are reduced; the portable low-temperature cryoscalpel can be widely used in the fields such as clinic treatment of various dermatoses, skin beauty and pet nursing; the portable low-temperature cryoscalpel is compact and exquisite in structure, simple in operation, and convenient to carry.

The invention provides an authigenic heat injection composition for underground catalytic oxidation of crude oil. The injection composition is a three-phase stable disperse system composed of water phase (anionic surfactant), an auxiliary agent, solid phase (nano-catalyst) and gas phase (air); the injection composition comprises the following raw materials: 0.1-1% of anionic surfactant taken as water phase, 0.1-1% of auxiliary agent, 0.1-1% of nano-catalyst taken as solid phase, and the balance of water, wherein the sum of the mass percent of the water phase, the auxiliary agent, the solid phase and the water is 100%; the volume ratio of the adding amount of the air to the total amount of the water phase, the auxiliary agent, the solid phase and the water is (3-7): 1. After the injection composition is adopted, the sweep efficiency of the air can be improved, the synchronous carrying of the catalyst and the air can be realized, and the problem of separation of underground air and catalyst can be avoided; the composition contains the efficient nanometer oxide catalyst, and the crude oil can be catalyzed to have oxidation reaction under the mild conditions, and therefore the problem that the stratum is blocked by coking caused by severe oxidation reaction is effectively avoided.

An environmental-friendly energy-saving stereoscopic biomembrane is disclosed. The stereoscopic biomembrane includes a membrane skeleton, a flower basket, a biomembrane and an aeration assembly. Netlike pattern weaving units are connected in order to each other through connecting points to form a stereoscopic netlike object provided with a plurality of round paths, and round fixing rings used for shaping are disposed in the paths according to process requirements, and therefore the round paths can ensure good aeration from bottom to top, microorganisms attached to the biomembrane are provided with sufficient oxygen, microorganisms free of vitality can be washed down and discharged along with water, biomembrane microorganism activity is increased, and the risk of blockage is eliminated. The disclosed biomembrane is stereoscopic so that a considerable biomembrane carrier surface can be generated, and the biomass is increased. The biomembrane is designed to have a stereoscopic structure and flowers and trees are planted in the flower basket, and therefore flow control can be achieved, no tension or significant load exists, energy is saved, the treating cost is reduced, the environment is beautified, pollutant emission is reduced, and waste water treating effects are greatly improved.

The invention relates to the technical field of ship vibration control, and provides a vibration control method and device for a water diversion port structure of a ship self-flow cooling system, the self-flow cooling system and a storage medium. The vibration control method for the water diversion port structure of the ship self-flowing cooling system comprises the steps that the disturbance intensity of the inner wall of a water diversion port is repeatedly adjusted, and the total vibration intensity of the tail end of the water diversion port is correspondingly obtained; obtaining the disturbance intensity corresponding to the minimum total vibration intensity, and taking the disturbance intensity as operation disturbance intensity; and controlling the inner wall of the water diversion port to generate disturbance according to the operation disturbance intensity. According to the vibration control method for the water diversion port structure of the self-flow cooling system of the ship, vortex-induced vibration can be effectively restrained, structural fatigue can be effectively relieved, and the safety and reliability of ship operation are improved.

The invention discloses a combined type hydraulic control valve. The combined type hydraulic control valve comprises vertical plates and transverse plates, the transverse plates are fixedly connected to the front sides and the rear sides of the upper portions of the inner ends of the multiple vertical plates, driving assemblies are arranged on the inner sides of the transverse plates, each driving assembly comprises a ball body, a handle, a sleeve, a vertical rod, a clamping block, an arc-shaped plate, a first spring, a round rod, a vertical rod and a first transverse rod, the round rods are connected to the inner sides of the left vertical rod and the right vertical rod in an attached mode, the first transverse rods are fixedly connected to the inner sides of the round rods, and the first transverse rods are slidably connected with the right end vertical plate. The combined type hydraulic control valve is scientific and reasonable in structure and safe and convenient to use, through cooperation of an oil inlet, the ball body, the handle, the vertical rod, the clamping block, the arc-shaped plate, the transverse plate and the sleeve, the clamping block is inserted into a groove of the arc-shaped plate again, oil liquid circulation control of the control valve is achieved, and the problem that an existing manual reversing valve cannot be locked after the reversing state is adjusted, and consequently reversing changes are prone to being caused by vibration or mistaken touch is solved.

The invention relates to a resonant DC interline power flow controller. The resonant DC interline power flow controller comprises a left-end energy flow direction controller, a resonant solid transformer and a right-end energy flow direction controller, wherein input ends of the left-end energy flow direction controller are a first terminal and a second terminal and an output end is connected with the resonant solid transformer; the output end of the resonant solid transformer is connected with the input end of the right-end energy flow direction controller and the output ends of the right-end energy flow direction controller are a third terminal and a fourth terminal; and the resonant solid transformer is a bidirectional resonant converter. The DC interline power flow controller is capable of achieving flow control of DC energy in any direction; isolation of a circuit is achieved by using the resonant solid transformer; and the circuit efficiency is improved.

The invention discloses a device for controlling the reaction of a microfluidic chip by using a camshaft. The device uses a camshaft with multiple cams to control multiple links in the reaction process of the microfluidic chip that need to be driven by pressure, such as the time-sharing release and flow control of various liquid reagents in the chip, gas The flow control, as well as the chip locking and other functions that need to be realized by mechanical pressing, the timing of the reaction can be automatically controlled by the curve profile of the cam, the installation sequence, and the rotation speed. The invention provides a feasible technical solution for the miniaturization of the analysis and detection device of the microfluidic chip, making it easier to be commercialized and having wider application prospects.

The invention relates to a preparation method and a functionalization method of a light-induced infiltration microfluidic chip. The surface of the chip is modified by a light-induced hydrophilic and hydrophobic material, and a hydrophilic and hydrophobic region boundary area is generated in the microstructure by ultraviolet exposure. An infiltration region can allow a fluid to pass through, and the fluid cannot enter a non-hydrophobic region subjected to Laplace pressure between columns, so that microfluidic channels are realized. By use of a photomask, exposure of different designs can be realized inside the chip, and different structures and functions of microfluidic chips are realized. Through the design of pressure-driven fluid channels and electroosmotic flow-driven fluid channels, the microfluidic chip can be erasable and can realize multifunctions on a single chip, and the production cycle and cost of design-fabrication-testing-reprocessing needed by traditional chips can be reduced. All the functions such as separation, synthesis, mixing and flow control of the microfluidic chips can be realized.

The invention provides an impeller, a blade and a blade section of a wind power generating set, the blade section includes a blade front section and a blade rear section, the blade front section includes a first main body, and the first main body includes a first connecting surface; the blade rear section includes a second main body and a blade rear section. The airbag, the second body is made of flexible material, the second body includes a second connection surface, the second body is fixedly connected with the first body; a cavity is arranged in the second body, the airbag is accommodated in the cavity, and the airbag includes an airbag wall , there is an air chamber in the airbag wall, when the environmental parameters at the location of the wind turbine meet the set parameter conditions, the volume of the gas in the air chamber increases, squeezing the airbag wall, causing the airbag wall to expand and squeeze the cavity The inner wall of the second main body expands at the corresponding position; when the environmental parameters meet the set parameter conditions, the blade stalls. The invention can effectively reduce the risk of blade stall.

The invention relates to the technical field of infrared spectrometer detection and discloses an expiration detector gas detection device. The device comprises a gas chamber, a detection part and a control circuit, wherein the air chamber comprises more than one air chamber pipe, medium pipes corresponding to the air chamber pipes, a first connecting piece and a second connecting piece, the detection part comprises a light source and a detector which are respectively arranged on two sides of the air chamber and form a light path, the control circuit comprises a main board and a preamplifier board which are electrically connected with each other, the main board provides a pulse type constant current source, and the pulse type constant current source is used for supplying power to the light source in the light path; the front amplifier board is used for amplifying, filtering and rectifying the electric signal to form a light intensity voltage signal. According to the device, a liquid medium sleeve structure is additionally arranged on the periphery of a current gas chamber structure, so the temperature of gas in the gas chamber changes slowly, uniformly and stably, the influence on a test result is reduced, and meanwhile, a more reliable pulse circuit is adopted to control light waves, the power-on working time of the light source is shortened, the service life is longer, and flexibility is relatively high.

The invention provides an intermediate case of an engine. The intermediate case comprises an outer wall, an inner wall and a plurality of supporting plates supported between the outer wall and the inner wall, each supporting plate forms a hollow structure through two bent surfaces of a blade, wherein a cross flow fan is arranged on the tail position inside at least one of the supporting plates, the cross flow fan comprises a driving shaft extending along the height direction of the supporting plate and fan blades circumferentially distributed along the length of the driving shaft, and the two surfaces of the blade of the supporting plate with the cross flow fan are provided with an air inlet in the position of the cross flow fan and an air outlet in the tail end of a tail part.

The invention relates to a resonant DC interline power flow controller. The resonant DC interline power flow controller comprises a left-end energy flow direction controller, a resonant solid transformer and a right-end energy flow direction controller, wherein input ends of the left-end energy flow direction controller are a first terminal and a second terminal and an output end is connected with the resonant solid transformer; the output end of the resonant solid transformer is connected with the input end of the right-end energy flow direction controller and the output ends of the right-end energy flow direction controller are a third terminal and a fourth terminal; and the resonant solid transformer is a bidirectional resonant converter. The DC interline power flow controller is capable of achieving flow control of DC energy in any direction; isolation of a circuit is achieved by using the resonant solid transformer; and the circuit efficiency is improved.